Achievement of full sexual capacity in animals and in humans.
A period in the human life in which the development of the hypothalamic-pituitary-gonadal system takes place and reaches full maturity. The onset of synchronized endocrine events in puberty lead to the capacity for reproduction (FERTILITY), development of secondary SEX CHARACTERISTICS, and other changes seen in ADOLESCENT DEVELOPMENT.
The active production and accumulation of VITELLINS (egg yolk proteins) in the non-mammalian OOCYTES from circulating precursors, VITELLOGENINS. Vitellogenesis usually begins after the first MEIOSIS and is regulated by estrogenic hormones.
The male gonad containing two functional parts: the SEMINIFEROUS TUBULES for the production and transport of male germ cells (SPERMATOGENESIS) and the interstitial compartment containing LEYDIG CELLS that produce ANDROGENS.
The lack of development of SEXUAL MATURATION in boys and girls at a chronological age that is 2.5 standard deviations above the mean age at onset of PUBERTY in a population. Delayed puberty can be classified by defects in the hypothalamic LHRH pulse generator, the PITUITARY GLAND, or the GONADS. These patients will undergo spontaneous but delayed puberty whereas patients with SEXUAL INFANTILISM will not.
The total process by which organisms produce offspring. (Stedman, 25th ed)
A major gonadotropin secreted by the adenohypophysis (PITUITARY GLAND, ANTERIOR). Luteinizing hormone regulates steroid production by the interstitial cells of the TESTIS and the OVARY. The preovulatory LUTEINIZING HORMONE surge in females induces OVULATION, and subsequent LUTEINIZATION of the follicle. LUTEINIZING HORMONE consists of two noncovalently linked subunits, alpha and beta. Within a species, the alpha subunit is common in the three pituitary glycoprotein hormones (TSH, LH and FSH), but the beta subunit is unique and confers its biological specificity.
Serotonin derivative proposed as potentiator for hypnotics and sedatives.
A decapeptide that stimulates the synthesis and secretion of both pituitary gonadotropins, LUTEINIZING HORMONE and FOLLICLE STIMULATING HORMONE. GnRH is produced by neurons in the septum PREOPTIC AREA of the HYPOTHALAMUS and released into the pituitary portal blood, leading to stimulation of GONADOTROPHS in the ANTERIOR PITUITARY GLAND.
A potent androgenic steroid and major product secreted by the LEYDIG CELLS of the TESTIS. Its production is stimulated by LUTEINIZING HORMONE from the PITUITARY GLAND. In turn, testosterone exerts feedback control of the pituitary LH and FSH secretion. Depending on the tissues, testosterone can be further converted to DIHYDROTESTOSTERONE or ESTRADIOL.
The measurement of an organ in volume, mass, or heaviness.
The processes of anatomical and physiological changes related to sexual or reproductive functions during the life span of a human or an animal, from FERTILIZATION to DEATH. These include SEX DETERMINATION PROCESSES; SEX DIFFERENTIATION; SEXUAL MATURATION; and changes during AGING.
Pheromones that elicit sexual attraction or mating behavior usually in members of the opposite sex in the same species.
Drugs used to increase fertility or to treat infertility.
The male reproductive organs. They are divided into the external organs (PENIS; SCROTUM;and URETHRA) and the internal organs (TESTIS; EPIDIDYMIS; VAS DEFERENS; SEMINAL VESICLES; EJACULATORY DUCTS; PROSTATE; and BULBOURETHRAL GLANDS).
A subfamily of MURIDAE found nearly world-wide and consisting of about 20 genera. Voles, lemmings, and muskrats are members.
The mass or quantity of heaviness of an individual. It is expressed by units of pounds or kilograms.
A subclass of group I phospholipases A2 that includes enzymes isolated from PANCREATIC JUICE. Members of this group have specificity for PHOSPHOLIPASE A2 RECEPTORS.
The first MENSTRUAL CYCLE marked by the initiation of MENSTRUATION.
Hormones that stimulate gonadal functions such as GAMETOGENESIS and sex steroid hormone production in the OVARY and the TESTIS. Major gonadotropins are glycoproteins produced primarily by the adenohypophysis (GONADOTROPINS, PITUITARY) and the placenta (CHORIONIC GONADOTROPIN). In some species, pituitary PROLACTIN and PLACENTAL LACTOGEN exert some luteotropic activities.
Intercellular signaling peptides that were originally characterized by their ability to suppress NEOPLASM METASTASIS. Kisspeptins have since been found to play an important role in the neuroendocrine regulation of REPRODUCTION.
An organochlorine insecticide that is carcinogenic.
The gradual irreversible changes in structure and function of an organism that occur as a result of the passage of time.
A small, unpaired gland situated in the SELLA TURCICA. It is connected to the HYPOTHALAMUS by a short stalk which is called the INFUNDIBULUM.
Hormones secreted by the adenohypophysis (PITUITARY GLAND, ANTERIOR) that stimulate gonadal functions in both males and females. They include FOLLICLE STIMULATING HORMONE that stimulates germ cell maturation (OOGENESIS; SPERMATOGENESIS), and LUTEINIZING HORMONE that stimulates the production of sex steroids (ESTROGENS; PROGESTERONE; ANDROGENS).
The reproductive organ (GONADS) in female animals. In vertebrates, the ovary contains two functional parts: the OVARIAN FOLLICLE for the production of female germ cells (OOGENESIS); and the endocrine cells (GRANULOSA CELLS; THECA CELLS; and LUTEAL CELLS) for the production of ESTROGENS and PROGESTERONE.
A major gonadotropin secreted by the adenohypophysis (PITUITARY GLAND, ANTERIOR). Follicle-stimulating hormone stimulates GAMETOGENESIS and the supporting cells such as the ovarian GRANULOSA CELLS, the testicular SERTOLI CELLS, and LEYDIG CELLS. FSH consists of two noncovalently linked subunits, alpha and beta. Within a species, the alpha subunit is common in the three pituitary glycoprotein hormones (TSH, LH, and FSH), but the beta subunit is unique and confers its biological specificity.
Establishment of the age of an individual by examination of their skeletal structure.
Sexual activities of animals.
A genus of hamsters characterized by small size, very short tail, and short, broad feet with hairy soles.
A biogenic amine that is found in animals and plants. In mammals, melatonin is produced by the PINEAL GLAND. Its secretion increases in darkness and decreases during exposure to light. Melatonin is implicated in the regulation of SLEEP, mood, and REPRODUCTION. Melatonin is also an effective antioxidant.
The 17-beta-isomer of estradiol, an aromatized C18 steroid with hydroxyl group at 3-beta- and 17-beta-position. Estradiol-17-beta is the most potent form of mammalian estrogenic steroids.
The time period of daily exposure that an organism receives from daylight or artificial light. It is believed that photoperiodic responses may affect the control of energy balance and thermoregulation.
An order of fish with eight families and numerous species of both egg-laying and livebearing fish. Families include Cyprinodontidae (egg-laying KILLIFISHES;), FUNDULIDAEl; (topminnows), Goodeidae (Mexican livebearers), Jenynsiidae (jenynsiids), Poeciliidae (livebearers), Profundulidae (Middle American killifishes), Aplocheilidae, and Rivulidae (rivulines). In the family Poeciliidae, the guppy and molly belong to the genus POECILIA.
The gamete-producing glands, OVARY or TESTIS.
The period in the ESTROUS CYCLE associated with maximum sexual receptivity and fertility in non-primate female mammals.
Steroid hormones produced by the GONADS. They stimulate reproductive organs, germ cell maturation, and the secondary sex characteristics in the males and the females. The major sex steroid hormones include ESTRADIOL; PROGESTERONE; and TESTOSTERONE.
The capacity to conceive or to induce conception. It may refer to either the male or female.
Phospholipoglycoproteins produced in the fat body of egg-laying animals such as non-mammalian VERTEBRATES; ARTHROPODS; and others. Vitellogenins are secreted into the HEMOLYMPH, and taken into the OOCYTES by receptor-mediated ENDOCYTOSIS to form the major yolk proteins, VITELLINS. Vitellogenin production is under the regulation of steroid hormones, such as ESTRADIOL and JUVENILE HORMONES in insects.
Gradual increase in the number, the size, and the complexity of cells of an individual. Growth generally results in increase in ORGAN WEIGHT; BODY WEIGHT; and BODY HEIGHT.
The tendency of a phenomenon to recur at regular intervals; in biological systems, the recurrence of certain activities (including hormonal, cellular, neural) may be annual, seasonal, monthly, daily, or more frequently (ultradian).
The convoluted tubules in the TESTIS where sperm are produced (SPERMATOGENESIS) and conveyed to the RETE TESTIS. Spermatogenic tubules are composed of developing germ cells and the supporting SERTOLI CELLS.
The maturing process of SPERMATOZOA after leaving the testicular SEMINIFEROUS TUBULES. Maturation in SPERM MOTILITY and FERTILITY takes place in the EPIDIDYMIS as the sperm migrate from caput epididymis to cauda epididymis.
Steroid-producing cells in the interstitial tissue of the TESTIS. They are under the regulation of PITUITARY HORMONES; LUTEINIZING HORMONE; or interstitial cell-stimulating hormone. TESTOSTERONE is the major androgen (ANDROGENS) produced.
Divisions of the year according to some regularly recurrent phenomena usually astronomical or climatic. (From McGraw-Hill Dictionary of Scientific and Technical Terms, 6th ed)
The alpha chain of pituitary glycoprotein hormones (THYROTROPIN; FOLLICLE STIMULATING HORMONE; LUTEINIZING HORMONE) and the placental CHORIONIC GONADOTROPIN. Within a species, the alpha subunits of these four hormones are identical; the distinct functional characteristics of these glycoprotein hormones are determined by the unique beta subunits. Both subunits, the non-covalently bound heterodimers, are required for full biologic activity.
A light-sensitive neuroendocrine organ attached to the roof of the THIRD VENTRICLE of the brain. The pineal gland secretes MELATONIN, other BIOGENIC AMINES and NEUROPEPTIDES.
Chemical substances, excreted by an organism into the environment, that elicit behavioral or physiological responses from other organisms of the same species. Perception of these chemical signals may be olfactory or by contact.
The process of germ cell development in the male from the primordial germ cells, through SPERMATOGONIA; SPERMATOCYTES; SPERMATIDS; to the mature haploid SPERMATOZOA.
Age as a constituent element or influence contributing to the production of a result. It may be applicable to the cause or the effect of a circumstance. It is used with human or animal concepts but should be differentiated from AGING, a physiological process, and TIME FACTORS which refers only to the passage of time.
A saclike, glandular diverticulum on each ductus deferens in male vertebrates. It is united with the excretory duct and serves for temporary storage of semen. (From McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed)
Glycoproteins that inhibit pituitary FOLLICLE STIMULATING HORMONE secretion. Inhibins are secreted by the Sertoli cells of the testes, the granulosa cells of the ovarian follicles, the placenta, and other tissues. Inhibins and ACTIVINS are modulators of FOLLICLE STIMULATING HORMONE secretions; both groups belong to the TGF-beta superfamily, as the TRANSFORMING GROWTH FACTOR BETA. Inhibins consist of a disulfide-linked heterodimer with a unique alpha linked to either a beta A or a beta B subunit to form inhibin A or inhibin B, respectively
RNA sequences that serve as templates for protein synthesis. Bacterial mRNAs are generally primary transcripts in that they do not require post-transcriptional processing. Eukaryotic mRNA is synthesized in the nucleus and must be exported to the cytoplasm for translation. Most eukaryotic mRNAs have a sequence of polyadenylic acid at the 3' end, referred to as the poly(A) tail. The function of this tail is not known for certain, but it may play a role in the export of mature mRNA from the nucleus as well as in helping stabilize some mRNA molecules by retarding their degradation in the cytoplasm.
A commercially important species of SALMON in the family SALMONIDAE, order SALMONIFORMES, which occurs in the North Atlantic.
Female germ cells derived from OOGONIA and termed OOCYTES when they enter MEIOSIS. The primary oocytes begin meiosis but are arrested at the diplotene state until OVULATION at PUBERTY to give rise to haploid secondary oocytes or ova (OVUM).
Condition resulting from deficient gonadal functions, such as GAMETOGENESIS and the production of GONADAL STEROID HORMONES. It is characterized by delay in GROWTH, germ cell maturation, and development of secondary sex characteristics. Hypogonadism can be due to a deficiency of GONADOTROPINS (hypogonadotropic hypogonadism) or due to primary gonadal failure (hypergonadotropic hypogonadism).
The status during which female mammals carry their developing young (EMBRYOS or FETUSES) in utero before birth, beginning from FERTILIZATION to BIRTH.
Receptors with a 6-kDa protein on the surfaces of cells that secrete LUTEINIZING HORMONE or FOLLICLE STIMULATING HORMONE, usually in the adenohypophysis. LUTEINIZING HORMONE-RELEASING HORMONE binds to these receptors, is endocytosed with the receptor and, in the cell, triggers the release of LUTEINIZING HORMONE or FOLLICLE STIMULATING HORMONE by the cell. These receptors are also found in rat gonads. INHIBINS prevent the binding of GnRH to its receptors.
Those characteristics that distinguish one SEX from the other. The primary sex characteristics are the OVARIES and TESTES and their related hormones. Secondary sex characteristics are those which are masculine or feminine but not directly related to reproduction.
Refers to animals in the period of time just after birth.
A lactogenic hormone secreted by the adenohypophysis (PITUITARY GLAND, ANTERIOR). It is a polypeptide of approximately 23 kD. Besides its major action on lactation, in some species prolactin exerts effects on reproduction, maternal behavior, fat metabolism, immunomodulation and osmoregulation. Prolactin receptors are present in the mammary gland, hypothalamus, liver, ovary, testis, and prostate.
Periodic movements of animals in response to seasonal changes or reproductive instinct. Hormonal changes are the trigger in at least some animals. Most migrations are made for reasons of climatic change, feeding, or breeding.
The surgical removal of one or both testicles.
That portion of the electromagnetic spectrum in the visible, ultraviolet, and infrared range.
Surgical removal or artificial destruction of gonads.
The physical characteristics of the body, including the mode of performance of functions, the activity of metabolic processes, the manner and degree of reactions to stimuli, and power of resistance to the attack of pathogenic organisms.
The surgical removal of one or both ovaries.
The discharge of an OVUM from a rupturing follicle in the OVARY.
Elements of limited time intervals, contributing to particular results or situations.
Genetically identical individuals developed from brother and sister matings which have been carried out for twenty or more generations or by parent x offspring matings carried out with certain restrictions. This also includes animals with a long history of closed colony breeding.
Progressive restriction of the developmental potential and increasing specialization of function that leads to the formation of specialized cells, tissues, and organs.
Any of the processes by which nuclear, cytoplasmic, or intercellular factors influence the differential control of gene action during the developmental stages of an organism.
Liquid by-product of excretion produced in the kidneys, temporarily stored in the bladder until discharge through the URETHRA.
The process of germ cell development in the female from the primordial germ cells through OOGONIA to the mature haploid ova (OVUM).
The distance from the sole to the crown of the head with body standing on a flat surface and fully extended.
Descriptions of specific amino acid, carbohydrate, or nucleotide sequences which have appeared in the published literature and/or are deposited in and maintained by databanks such as GENBANK, European Molecular Biology Laboratory (EMBL), National Biomedical Research Foundation (NBRF), or other sequence repositories.
Common name for the species Gallus gallus, the domestic fowl, in the family Phasianidae, order GALLIFORMES. It is descended from the red jungle fowl of SOUTHEAST ASIA.
Ventral part of the DIENCEPHALON extending from the region of the OPTIC CHIASM to the caudal border of the MAMMILLARY BODIES and forming the inferior and lateral walls of the THIRD VENTRICLE.
The major progestational steroid that is secreted primarily by the CORPUS LUTEUM and the PLACENTA. Progesterone acts on the UTERUS, the MAMMARY GLANDS and the BRAIN. It is required in EMBRYO IMPLANTATION; PREGNANCY maintenance, and the development of mammary tissue for MILK production. Progesterone, converted from PREGNENOLONE, also serves as an intermediate in the biosynthesis of GONADAL STEROID HORMONES and adrenal CORTICOSTEROIDS.
A 16-kDa peptide hormone secreted from WHITE ADIPOCYTES. Leptin serves as a feedback signal from fat cells to the CENTRAL NERVOUS SYSTEM in regulation of food intake, energy balance, and fat storage.
The hollow thick-walled muscular organ in the female PELVIS. It consists of the fundus (the body) which is the site of EMBRYO IMPLANTATION and FETAL DEVELOPMENT. Beyond the isthmus at the perineal end of fundus, is CERVIX UTERI (the neck) opening into VAGINA. Beyond the isthmi at the upper abdominal end of fundus, are the FALLOPIAN TUBES.
A strain of albino rat developed at the Wistar Institute that has spread widely at other institutions. This has markedly diluted the original strain.
Specialized cells of the hematopoietic system that have branch-like extensions. They are found throughout the lymphatic system, and in non-lymphoid tissues such as SKIN and the epithelia of the intestinal, respiratory, and reproductive tracts. They trap and process ANTIGENS, and present them to T-CELLS, thereby stimulating CELL-MEDIATED IMMUNITY. They are different from the non-hematopoietic FOLLICULAR DENDRITIC CELLS, which have a similar morphology and immune system function, but with respect to humoral immunity (ANTIBODY PRODUCTION).
The sequence of PURINES and PYRIMIDINES in nucleic acids and polynucleotides. It is also called nucleotide sequence.
A variation of the PCR technique in which cDNA is made from RNA via reverse transcription. The resultant cDNA is then amplified using standard PCR protocols.
The technique that deals with the measurement of the size, weight, and proportions of the human or other primate body.
A type of CELL NUCLEUS division, occurring during maturation of the GERM CELLS. Two successive cell nucleus divisions following a single chromosome duplication (S PHASE) result in daughter cells with half the number of CHROMOSOMES as the parent cells.
Cells propagated in vitro in special media conducive to their growth. Cultured cells are used to study developmental, morphologic, metabolic, physiologic, and genetic processes, among others.
Classic quantitative assay for detection of antigen-antibody reactions using a radioactively labeled substance (radioligand) either directly or indirectly to measure the binding of the unlabeled substance to a specific antibody or other receptor system. Non-immunogenic substances (e.g., haptens) can be measured if coupled to larger carrier proteins (e.g., bovine gamma-globulin or human serum albumin) capable of inducing antibody formation.
Linear POLYPEPTIDES that are synthesized on RIBOSOMES and may be further modified, crosslinked, cleaved, or assembled into complex proteins with several subunits. The specific sequence of AMINO ACIDS determines the shape the polypeptide will take, during PROTEIN FOLDING, and the function of the protein.
Mature male germ cells derived from SPERMATIDS. As spermatids move toward the lumen of the SEMINIFEROUS TUBULES, they undergo extensive structural changes including the loss of cytoplasm, condensation of CHROMATIN into the SPERM HEAD, formation of the ACROSOME cap, the SPERM MIDPIECE and the SPERM TAIL that provides motility.
Maleness or femaleness as a constituent element or influence contributing to the production of a result. It may be applicable to the cause or effect of a circumstance. It is used with human or animal concepts but should be differentiated from SEX CHARACTERISTICS, anatomical or physiological manifestations of sex, and from SEX DISTRIBUTION, the number of males and females in given circumstances.
Methods used to induce premature oocytes, that are maintained in tissue culture, to progress through developmental stages including to a stage that is competent to undergo FERTILIZATION.
An indicator of body density as determined by the relationship of BODY WEIGHT to BODY HEIGHT. BMI=weight (kg)/height squared (m2). BMI correlates with body fat (ADIPOSE TISSUE). Their relationship varies with age and gender. For adults, BMI falls into these categories: below 18.5 (underweight); 18.5-24.9 (normal); 25.0-29.9 (overweight); 30.0 and above (obese). (National Center for Health Statistics, Centers for Disease Control and Prevention)

Differential transcriptional activity associated with chromatin configuration in fully grown mouse germinal vesicle oocytes. (1/2118)

It was previously shown that fully grown ovarian germinal vesicle (GV) oocytes of adult mice exhibit several nuclear configurations that differ essentially by the presence or absence of a ring of condensed chromatin around the nucleolus. These configurations have been termed, respectively, SN (surrounded nucleolus) and NSN (nonsurrounded nucleolus). Work from our and other laboratories has revealed ultrastructural and functional differences between these two configurations. The aims of the present study were 1) to analyze the equilibrium between the SN and the NSN population as a function of the age of the mice and the time after hCG-induced ovulation and 2) to study the polymerase I (pol I)- and polymerase II (pol II)-dependent transcription in both types of oocytes through the detection of bromouridine incorporated into nascent RNA. We show 1) that ovarian GV oocytes exhibiting the SN-type configuration can be found as soon as 17 days after birth in the C57/CBA mouse strain and 2) that the SN:NSN ratio of ovarian GV oocytes is very low just after hCG-induced ovulation and then increases progressively with the time after ovulation. Furthermore, we demonstrate that the SN configuration correlates strictly with the arrest of both pol I- and pol II-dependent transcription in mice at any age. Finally, we show that ribosomal genes are located at the outer periphery of the nucleolus in the NSN configuration and that pol I-dependent perinucleolar transcription sites correspond to specific ultrastructural features of the nucleolus. Altogether, these results provide clear-cut criteria delineating transcriptionally active GV oocytes from those that are inactive, and confirm that the SN-type configuration is mostly present in preovulatory oocytes.  (+info)

Precocious estrus and reproductive ability induced by PG 600 in prepuberal gilts. (2/2118)

A total of 29 SPF Large White prepuberal gilts (mean age 152 days at treatment) were examined for estrous and ovulatory responses after PG 600 treatment. After treatment, 85.2% of the gilts showed standing estrus within 6 days. Whereas the treatment-to-estrus interval and duration were 3.7 and 1.9 days respectively. As ovulation occurred on Day 5 to 6, appropriate timing of artificial insemination would be about 4 days after treatment. Fertility of gilts revealed to be excellent, giving rise to a high percentage of normal embryos, 85.3%. Meanwhile, development and growth of fetuses were mostly normal. Other reproductive performances recorded were: mean litter size 6.8; mean birth weight 1.26 kg; weaning-to-return estrus interval 5 to 8 days. In conclusion, PG 600 was found to be useful in inducing fertile estrus in prepuberal gilts, a result which will be of interest for commercial pig farms.  (+info)

The degenerative fate of germ cells not conforming to stage in the pubertal golden hamster testis. (3/2118)

In the golden hamster (Mesocricetus auratus), pubertal establishment of spermatogenesis includes a defined period (d 26-30 of life) during which elongation of spermatids is selectively arrested. The resulting appearance of germ cell associations not conforming to stage and the phenomenon of desynchronisation-related germ cell degeneration are analysed both quantitatively and qualitatively by means of light and 'retrospective' electron microscopy. From d 26 onwards, the portion of tubules containing non-stage conforming germ cell associations gradually increases up to 37.5% of sectioned tubules on d 32. Concomitantly, the degree of desynchronisation rises to a maturational gap between spermatids and associated younger germ cells of 7 stages of the seminiferous epithelium cycle, i.e. of fully half a cycle. Beyond d 32, the frequency of desynchronised tubule segments decreases again. Some of the arrested round spermatids and, eventually, all belatedly elongating spermatids degenerate and are lost from the epithelium. Thus a regular maturation of advanced spermatids does not succeed under non-stage conforming conditions. Possibly it is not the desynchronisation between the associated germ cell generations and the spermatids by itself that impedes normal further development of the latter cells. Instead this may be due to the maturational delay of the stage-aberrant cells by several stages compared to the seminiferous epithelium as a whole and, especially, in relation to the stage-conditioned functional state of the neighbouring Sertoli cells.  (+info)

Leptin and reproduction. (4/2118)

In the few years since leptin was identified as a satiety factor in rodents, it has been implicated in the regulation of various physiological processes. Leptin has been shown to promote sexual maturation in rodent species and a role in reproduction has been investigated at various sites within the hypothalamo-pituitary-gonadal axis. This review considers the evidence that leptin (or alteration in amount of body fat) can affect reproduction. There is evidence that leptin plays a permissive role in the onset of puberty, probably through action on the hypothalamus, where leptin receptors are found in cells that express appetite-regulating peptides. There is little evidence that leptin has a positive effect on the pituitary gonadotrophs and the gonads. There is also very little indication that leptin acts in an acute manner to regulate reproduction in the short term. It seems more likely that leptin is a 'barometer' of body condition that sends signals to the brain. Studies in vitro have shown negative effects on ovarian steroid production and there are no reports of effects on testicular function. Leptin concentrations in plasma increase in women during pregnancy, owing to production by the placenta but the functional significance of this is unknown. A number of factors that affect the production and action of leptin have yet to be studied in detail.  (+info)

Effect of long-term food restriction on pituitary sensitivity to cLHRH-I in broiler breeder females. (5/2118)

The effect of long-term food restriction on the sensitivity of the pituitary to exogenously administered chicken luteinizing hormone releasing hormone I (cLHRH-I) was investigated in three groups of broiler breeder females fed ad libitum, fed a restricted quantity of food or fed a restricted quantity of food to obtain an intermediate body weight between those of the first two groups. At 16 weeks of age, basal FSH release was higher in ad libitum fed birds, culminating in ovarian development and subsequent oestradiol production by the small follicles. At this age, LH secretion was independent of ovarian feedback factors. In all groups, cLHRH-I was most active in releasing LH in intact and ovariectomized animals and, to a lesser extent, in releasing FSH in ovariectomized birds. At 39 weeks of age, basal FSH concentrations were similar among intact animals of all groups, whereas LH concentrations differed among groups, with higher values in the restricted birds. This food effect was enhanced in ovariectomized birds. Furthermore, the high response to cLHRH-I in the ovariectomized, restricted birds compared with the ad libitum, ovariectomized group suggests an improved sensitivity of the hypothalamic-pituitary axis. In conclusion, birds fed ad libitum showed the highest responsiveness to ovarian factors and to cLHRH-I in releasing FSH in the period before sexual maturity. No effect of amount of feeding could be observed for LH. However, during the egg laying period, LH release by cLHRH-I was highly dependent on amount of feeding and on ovarian feedback regulation. This finding indicates that the amount of feeding can modify the sensitivity of the pituitary to cLHRH-I, and possibly to gonadal hormones, during the laying period.  (+info)

Developmental changes in LH secretion by male pituitaries in vitro: from the infantile to adult period. (6/2118)

The secretion of LH from the anterior pituitary of male rats was studied at different periods of postnatal development. According to an established classification we used rats 14 (infantile), 23 (juvenile), 45 (pubertal) and 90 (adult) days old. By using an in vitro incubation system, both basal and stimulated LH secretion were studied in the same gland. Age-related differences were observed in basal LH secretion, with juvenile and pubertal pituitaries showing higher secretion compared with infantile and adult pituitaries. However, the GnRH-induced secretory response was significantly higher in the infantile rats than in other ages. LH secretion was also studied in primary cultures from infantile or adult pituitaries. In 24 and 48 h cultures, infantile cells showed a significantly larger response to GnRH than that of adult cells. In the infantile pituitary LH-immunopositive cells showed differences in size at different locations in the gland. At the periphery of the lobes the predominant cells were smaller and angular shaped, whereas in the center of the gland the majority of the cells were ovoid shaped. In the adult pituitary, the predominant LH-positive cells were ovoid in shape and larger in size. Furthermore, 10% more LH-positive cells were observed in infantile pituitaries. On the basis of these data we propose that at the infantile period the male rat pituitary has two populations of LH-secreting cells, one with adult secretory function and shape and a second with increased sensitivity to GnRH and with a morphology atypical of the adult cell. The results presented support the hypothesis that the infantile period is a transitional stage in the rat pituitary development.  (+info)

Opposing changes in 3alpha-hydroxysteroid dehydrogenase oxidative and reductive activities in rat leydig cells during pubertal development. (7/2118)

The enzyme 3alpha-hydroxysteroid dehydrogenase (3alpha-HSD) has an important role in androgen metabolism, catalyzing the interconversion of dihydrotestosterone (DHT) and 5alpha-androstane-3alpha,17beta-diol (3alpha-DIOL). The net direction of this interconversion will affect the amount of biologically active ligand available for androgen receptor binding. We hypothesize that in Leydig cells, differential expression of 3alpha-HSD enzymes favoring one of the two directions is a mechanism by which DHT levels are controlled. In order to characterize 3alpha-HSD in rat Leydig cells, the following properties were analyzed: rates of oxidation (3alpha-DIOL to DHT) and reduction (DHT to 3alpha-DIOL) and preference for the cofactors NADP(H) and NAD(H) (i.e., the oxidized and reduced forms of both pyridine nucleotides) in Leydig cells isolated on Days 21, 35, and 90 postpartum. Levels of 3alpha-HSD protein were measured by immunoblotting using an antibody directed against the liver type of the enzyme. Levels of 3alpha-HSD protein and rates of reduction were highest on Day 21 and lowest on Day 90. The opposite was true for the rate of 3alpha-HSD oxidation, which was barely detectable on Day 21 and highest on Day 90 (59.08 +/- 6.35 pmol/min per 10(6) cells, mean +/- SE). Therefore, the level of 3alpha-HSD protein detectable by liver enzyme was consistent with reduction but not with oxidation. There was a clear partitioning of NADP(H)-dependent activity into the cytosolic fraction of Leydig cells, whereas on Days 35 and 90, Leydig cells also contained a microsomal NAD(H)-activated 3alpha-HSD. We conclude that 1) the cytosolic 3alpha-HSD in Leydig cells on Day 21 behaves as a unidirectional NADPH-dependent reductase; 2) by Day 35, a microsomal NAD(H)-dependent enzyme activity is present and may account for predominance of 3alpha-HSD oxidation over reduction and the resultant high capacity of Leydig cells on Day 90 to synthesize DHT from 3alpha-DIOL.  (+info)

Disruption of estrogen signaling does not prevent progesterone action in the estrogen receptor alpha knockout mouse uterus. (8/2118)

Estrogen is known to increase progesterone receptor (PR) levels in the wild-type mouse uterus, and this estrogen induction was thought to be important for progesterone action through the PR. The estrogen receptor alpha knockout (ERKO) mouse uterus was observed to express PR mRNA that cannot be induced by estrogen. Progesterone action was characterized to determine whether it was diminished in ERKO mice. The PR protein is present in the ERKO uterus at 60% of the level measured in a wild-type uterus. The PR-A and PR-B isoforms are both detected on Western blot, and the ratio of isoforms is the same in both genotypes. Although the level of PR is reduced in the ERKO uterus, the receptor level is sufficient to induce genomic responses, since both calcitonin and amphiregulin mRNAs were increased after progesterone treatment. Finally, the ERKO uterus can be induced to undergo a progesterone-dependent decidual response. Surprisingly, the decidual response is estrogen independent in the ERKO, although it remains estrogen dependent in a wild type. These results indicate that estrogen receptor alpha modulation of PR levels is not necessary for expression of the PR or genomic and physiologic responses to progesterone in the ERKO uterus.  (+info)

The pollution of endocrine disruptors and its impact on human reproductive system have attracted much attention. Di-(2-ethylhexyl) phthalate (DEHP), an environmental endocrine disruptor, is widely used in food packages, containers, medical supplies and childrens toys. It can cause diseases such as infertility, sexual precocity and uterine bleeding and thus arouse concerns from the society and scholars. The effect of DEHP on pubertal female reproductive system is still not well-studied. This study was to investigate the effects of DEHP on the hypothalamus-uterus in pubertal female rats, reveal the reproductive toxicity of DEHP on pubertal female rats and its mechanism, and provide scientific evidence for the evaluation of toxicity and toxic mechanism of DEHP on reproductive system. Forty-eight pubertal female rats were randomly divided into four groups and respectively administered via oral gavage 0, 250, 500, or 1000 mg/kg/d DEHP in 0.1 mL corn oil/20 g body weight for up to four weeks. Compared with
TY - JOUR. T1 - Activation of growth hormone short loop negative feedback delays puberty in the female rat. AU - Advis, J. P.. AU - Smith-White, S.. AU - Ojeda, Sergio. PY - 1981. Y1 - 1981. N2 - Implantation of GH in the median eminence of the hypothalamus of 23-day-old female rats tonically inhibited serum GH levels throughout prepubertal development (days 23-36) and depressed GH diurnal pulsatile release. Puberty was significantly delayed in GH-deficient animals, a delay associated with a blunted in vitro ovarian steroidal responsiveness to gonadotropins (particularly estradiol) and a marked decrease in prepubertal uterine weight, as evaluated 4, 7, and 13 days after GH implantation. The prepubertal body weight increase was also depressed. Neither ovarian weight nor serum levels of LH, FSH, PRL, or TSH were consistently altered by the GH implant. In addition, evaluation of pulsatile PRL release in 33-day-old rats revealed no difference between control and GH-deficient animals. Ovarian LH ...
What happens when children reach puberty earlier and adulthood later? The answer is: a good deal of teenage weirdness.... Quote by Alison Gopnik
Here are a few things that might help:Speak up.. If youre worried about your development, dont keep it to yourself.. …. Get a checkup.. Your doctor has seen tons of kids go through puberty.. …. Ask your doctor about treatment.. …. Educate yourself.. …. Connect with other kids like you.. …. Eat a healthy diet.. …. Get active.. …. Dont overdo it.More items…•.. ...
The objective of the study was to characterize body growth, testicular development, and puberty from 8 to 14 mo of age in bulls (n = 120) produced by mating sires from Hereford, Angus, Norwegian Red, Swedish Red and White, Friesian, and Wagyu breeds to MARC III (¹⁄₄ Hereford, ¹⁄₄ Angus, ¹⁄₄ Red Poll, and ¹⁄₄ Pinzgauer) cows. Traits evaluated were birth weight, weaning weight (at 215 d), yearling weight, ADG from 8 to 14 mo of age, paired testicular volume growth from 8 to 14 mo of age, age at puberty (determined by production of 50 × 106 sperm with 10% motility), age at freezable semen (determined by production of 500 × 106 sperm with 50% motility), and, at 15 mo of age, paired testicular weight and daily sperm production per testis pair. There was an effect of sire breed (P = 0.03) for age at puberty; animals with Wagyu and Swedish Red and White inheritance reached puberty at a later date (302 and 302 d of age, respectively) compared with Angus-sired bulls (268 d). Age at puberty
Consuming excess dietary salt may result in late onset of puberty that can lead to behavioural problems, stress and reduced fertility, new research says
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Este estudo avaliou o crescimento físico e desenvolvimento puberal de crianças e adolescentes de 10 anos a 18 anos e 6 meses com fissuras labiopalatinas (FLP). Foi realizado um estudo descritivo transversal,...
Erden, Y., Tekin, S., Ozyalin, F., Ozen, H., Colak, C., Sandal, S. The Effects of Apelin-13 on Puberty in Female Rats. (2015). ACTA PHYSIOLOGICA ...
Japans largest platform for academic e-journals: J-STAGE is a full text database for reviewed academic papers published by Japanese societies
I would quite like to go to the theatre, if only I had a friend to go with me. In this one sentence a great part of the desires which occupy Hubert Fichtes protagonists and motivate the plot of his postwar novel appear to culminate. A young man on the verge of adulthood finds out that he is homosexual. More precisely, the writer Hans Werner Pozzi predicts this orientation from the analysis of his urine. His mother, who is about to lose her job as a prompter for the Thalia Theater because the artistic directors wife does not like her, shares her sons love for the theatre. With reference to Stanislavsky, they rehearse Sartres plays to escape the infamous pathos of the Nazi-era theatre. In postwar Hamburg artistic freedom and open homosexuality are still regarded as an affront to the bourgeoisie. Fichtes »Essay on Puberty« is not just a memoir on growing up, which appears as hopeful as it does brutal, but also a novel about Hamburg: A highly personal city guide through the artistic milieu ...
vaginal opening - MedHelps vaginal opening Center for Information, Symptoms, Resources, Treatments and Tools for vaginal opening. Find vaginal opening information, treatments for vaginal opening and vaginal opening symptoms.
The objective of this research project is to determine whether exposure to dioxins, a byproduct of industrial processes and an environmental contaminant, is associated with altered growth and sexual maturation in boys. Specific objectives include exploring whether physical growth is delayed and stunted, whether sexual maturation is delayed, and whether reproductive hormones are altered. Dioxin levels will be measured in blood samples drawn from the boys and their mothers. Yearly physical examinations will be performed to assess growth velocity and onset and tempo of sexual maturation. Questionnaire data will be collected on birth and medical history, as well as lifestyle factors. Statistical modeling will be used to explore the relationship between serum levels of dioxin and altered physical growth and sexual maturation.. ...
Diagnosis of hormonal disorder in women during sexual maturation (costs for program #151233) ✔ University Hospital Münster ✔ Department of Gerneral Internal Medicine, Gastroenterology and Metabolic Disorders (Medical Department B) ✔ BookingHealth.com
Development-related changes in the expression of the ovarian Kiss1 and Kiss1r genes and their sensitivity to human chorionic gonadotropin in prepubertal female ratsDevelopment-related changes in the expression of the ovarian Kiss1 and Kiss1r genes and their sensitivity to human chorionic gonadotropin in prepubertal female rats ...
In the largest longitudinal study to date of electrical activity in the brains of sleeping adolescents, UC Davis scientists have discovered that the timing of brain maturation is associated with the timing of puberty. [en español]
Children. Preterm infants. Preterm infants may exceed 630 ng/dL, however, it is uncommon to see levels reach 1,000 ng/dL.. Term infants. 0-28 days: ,630 ng/dL. Levels fall from newborn (,630 ng/dL) to prepubertal gradually within 6 months.. Prepubertal males: ,110 ng/dL. Prepubertal females: ,100 ng/dL Adults. Males: ,220 ng/dL. Females. Follicular: ,80 ng/dL. Luteal: ,285 ng/dL. Postmenopausal: ,51 ng/dL. Note: For pregnancy reference ranges, see: Soldin OP, Guo T, Weiderpass E, et al: Steroid hormone levels in pregnancy and 1 year postpartum using isotope dilution tandem mass spectrometry. Fertil Steril 2005 Sept;84(3):701-710. ...
Hi! Im James Herer, contributor here at Weblyf. If you think its important for my works to continue, please consider supporting by sending a financial donation. Any amount will be greatly appreciated. For tips, information, questions and suggestions, email me at [email protected] ...
హాయ్‌ డాక్టర్. మా పాప వయసు 12 ఏళ్లు. 11 ఏళ్లకు రజస్వల అయింది. గత ఆరు నెలలుగా పిరియడ్స్‌ రాలేదు. ఇలా ఎందుకు అవుతుందో భయంగా ఉంది. దయచేసి చెప్పండి. - ఓ సోదరి
Principal Investigator:OKATANI Yuji, Project Period (FY):1997 - 1998, Research Category:Grant-in-Aid for Scientific Research (C), Section:一般, Research Field:Obstetrics and gynecology
There are plenty of websites out there who will offer this information but the trick is to find a website that is reputable and committed to giving the reader good accurate information. When you are on a website always click on the Who We Are tab to find out who is providing the information and who the site is sponsored by. TeenHealthFX.com is a great site for the exact purposes you are looking for. What makes TeenHealthFX even more unique is that there is no interaction between the site and its users. All answers to questions are posted to the site itself which provides complete anonymity for the question sender. Currently there are answers to almost 4,500 questions covering a wide variety of topics having to do with Adolescent Health. Another advantage of this approach is that the content is driven adolescents from all over the world who write in questions. Another great site that uses this format is Go Ask Alice.. Here are some other good sites that TeenHealthFX would recommend:. WebMD - ...
Synonyms for prepubertal in Free Thesaurus. Antonyms for prepubertal. 1 synonym for prepubertal: prepubescent. What are synonyms for prepubertal?
Lehti tai sarja: Obesity. ISSN: 1930-7381. eISSN: 1930-739X. Julkaisuvuosi: 2017. Volyymi: 25. Lehden numero: 6. Artikkelin sivunumerot: 1077-1082. Kustantaja: John Wiley & Sons. Julkaisumaa: Yhdysvallat (USA). Julkaisun kieli: englanti. DOI: https://doi.org/10.1002/oby.21838. Julkaisun avoin saatavuus: Ei avoin. Julkaisukanavan avoin saatavuus: Julkaisu on rinnakkaistallennettu (JYX): https://jyx.jyu.fi/handle/123456789/56394. ...
Study Flashcards On Puberty at Cram.com. Quickly memorize the terms, phrases and much more. Cram.com makes it easy to get the grade you want!
Study Flashcards On Puberty at Cram.com. Quickly memorize the terms, phrases and much more. Cram.com makes it easy to get the grade you want!
The first aim of the module is to provide students with an understanding of the regulation of follicular development, estrous cycle in animals. Students will have the opportunity to study the physiological changes in the female and male reproductive systems through puberty and into sexual maturity. Throughout the module the student should become familiar with how these systems have been key to the development of assisted reproductive technologies and advancement in modern breeding systems within commercial livestock, companion animals and wildlife species. The second aim of the module is to understand the oocyte development and formation, through to the free living blastocyst. Highlighting the changes that occur in the pregnant mother and developing fetus throughout this crucial time. You will also get to examine the physiological processes that determine prenatal growth and development of mammals and how the allocation of nutrients at different stages of development can impact the efficiency of ...
As teenagers reach puberty, their bodies are likely to undergo significant changes, and their moods may be unpredictable and sometimes hard...
This condition is an abnormal curvature of the spine. It most often develops in early childhood, just before a child reaches puberty.
Question - Spotting between period, severe itching in vulva, vaginal opening. Had thick dark white discharge. Reason? . Ask a Doctor about when and why Pap smear is advised, Ask an OBGYN, Gynecologic Oncology
This is the 3rd part of the video. This video explains male physiology which involves normal hypothalamic-pituitary-testicular axis, androgen physiology, sperm formation, and sexual maturation at...
Biologically, an adult is surely an organism which includes reached sexual maturity. In human context, the phrase adult In addition has meanings affiliated with social and legal ideas. In contrast to some slight, a authorized adult is a one who has attained the age of greater part which is hence regarded as impartial, self-sufficient, and accountable ...
TY - JOUR. T1 - Effects of synthetic kisspeptin peptides and GnRH analogue on oocyte growth and circulating sex steroids in prepubertal female chub mackerel (Scomber japonicus). AU - Selvaraj, Sethu. AU - Ohga, Hirofumi. AU - Nyuji, Mitsuo. AU - Kitano, Hajime. AU - Nagano, Naoki. AU - Yamaguchi, Akihiko. AU - Matsuyama, Michiya. PY - 2015/8/1. Y1 - 2015/8/1. N2 - In recent years, kisspeptin peptides, encoded by kiss genes have been used to manipulate reproductive processes in farmed animals, including fish. Our previous studies demonstrated that the chub mackerel brain expresses kiss1 and kiss2 and intramuscular injection of synthetic Kiss1 pentadecapeptide (Kiss1-15) but not Kiss2 dodecapeptide (Kiss2-12) accelerates spermatogenesis in prepubertal male chub mackerel (Scomber japonicus). In the present study, we evaluated their effects in prepubertal female chub mackerel. The gonadosomatic index (GSI) values of experimental fish did not show any significant changes. Condition factor (CF) values ...
Objectives were twofold: 1 ) to determine the chronology of development of dominant ovarian follicles during the peripubertal period in heifers and 2) to determine whether feeding a diet with low energy content that delays onset of puberty alters chronology of dominant ovarian follicular development in peripubertal heifers. Ten heifers of composite breeding ( 1/4 Angus, 1/4 Hereford, 1/4 Red Poll, 1/4 Pinzgauer) were randomly assigned, at 8 mo of age, to receive a diet designed to produce 0.9 (n = 5) or 0.3 (n = 5) kg body weight gain per day for the duration of the experiment. To characterize changes in size of ovarian follicles, real-time linear ultrasonography of ovaries was conducted in all heifers every other day until puberty occurred. Blood samples were collected weekly to determine concentrations of progesterone and 17β-estradiol. Determination of time of puberty was based on increased concentrations of progesterone, ultrasound depiction of ovulation, and subsequent presence of a corpus luteum.
The present study assessed if eating a diet of fish, spiked with persistent organic pollutants (POPs), affects gene and protein expression in the maturing mouse brain. Juvenile female Balb/c mice (22 days of age) were exposed for 28 days to fish-based diets spiked with the dioxin 2,3,7,8-tetrachlorodibenzodioxin (TCDD) or the non dioxin-like (NDL) chemicals hexabromocyclodocecane (HBCD), 2,24,4-tetrabromodiphenylether (BDE-47) or 2,24,4,5,5-hexachlorobiphenyl (CB-153) at doses approximating their respective lowest observed adverse effect levels (LOAEL). It was found that all POPs elicited changes in neural gene and protein expression profiles. Bioinformatic analysis of gene expression data highlighted the importance of the aryl hydrocarbon receptor (AHR) in dioxin toxicity and revealed that zinc regulation in the brain is targeted by TCDD through the AHR. Calcium homeostasis was affected by both TCDD and the NDL chemicals. In contrast to the transcriptomic analysis, the proteomics data did not
At puberty, sex hormones or gametes begin to be produced due to which the boys and girls become sexually mature.. The period during which adolescent boys and girls reach sexual maturity and become capable of reproduction is called puberty.. Puberty is a period of several years in which rapid physical growth occurs leading to sexual maturity.It tends to start earlier in girls than in boys.Girls attain puberty at a age of 10 to 13 yrs while boys reach puberty at a age of 12 to 14 yrs.. Changes which occur in boys during puberty are:. 1)Hair grow on the face in the form of moustache and beard, and on the chest.. 2)Voice deepens in boys.It becomes low pitched voice.. 3)Testes start to make sperm.. ...
Testosterone is the hormone that puts hair on a mans chest and face. It also puts muscles on a boy when he reaches puberty. When a boy reaches puberty, it is testosterone that drives his sexual urges. Testosterone is responsible for the increase of a mans penis size when he reaches puberty. Testosterone makes the voice deep and promotes sperm production. As a man gets older, his testosterone levels decline. When a man is between the ages of 25 and 75, his testosterone level can decrease by 30 percent or one percent every year after age 30. Some people think it is one percent every year after age 40. This lowering of testosterone levels are a normal part of aging. Signs of lowering testosterone levels can be seen in some loss of height because of lower bone density. Other signs of shrinking testosterone include, libido reduction, less muscle mass, and increasing fat. Low T as it is called, affects between 4 to 5 million men in the United States.. The decline in testosterone in aging men is ...
Around 15 percent of girls are going through puberty by age 7 -- and doctors cant explain why! According to a study of 1,239 girls, published in the journal Pediatrics, 15 percent of girls hit puberty by the age of 7, and the finding has doctors perplexed.
On a recent winter press tour, Modern Family stars Ariel Winter, Sarah Hyland, and Nolan Gould described what it was like to go through puberty on television.
Interpretive Summary: Female pigs need to remain in the breeding herd and produce at least three litters of piglets in order to cover the costs of their development; many are culled before they reach this threshold. Studies have shown that growth rates and body composition of female pigs before they reach puberty affects both puberty onset and retention in the breeding herd. This study was designed to develop diets that would manipulate growth rates and body composition of young female pigs and determine their effects on age at puberty and reproductive tract development as a prelude to testing dietary effects on retention of sows in the breeding herd. Six different diets were developed consisting of all combinations of three different metabolizable energy levels (ME; high, control and low) and two different lysine levels (L; control and low) and were provided to female pigs without restriction from 100 days of age until 260 days of age. Growth and body composition measures were made throughout ...
Experiments were conducted to investigate the influence of environment and neuroendocrine factors on puberty in Yorkshire gilts and ovarian function in hypophysial stalk-transected (HST) heifers;Thirty-six, 3-month-old gilts were reared in isolation under 3 photoperiodic regimens of total darkness, constant light and normal summer daylight and their growth and ages at puberty compared to littermates reared in groups under normal summer daylight. The growth rates, percentages of animals cycling at 8 months and the average ages at puberty were similar for all treatment groups. The olfactory bulbs of 12 Yorkshire gilts (OB) 3-5 months old were removed and their growth and ages at puberty compared to sham-operated littermates (SC). Growth rates in both groups were similar, but the percentage of OB gilts cycling at 9 months (33) was significantly less (P | 0.05) than SC gilts (80). These results indicate that isolation, total darkness or constant light do not influence significantly growth rate or time of
Kisspeptin, a peptide encoded by the Kiss1 gene, has been considered as a potential candidate for a factor triggering the onset of puberty, and its expression in the hypothalamus was found to increase during peripubertal period in rodent models. The present study aimed to clarify the oestrogenic reg
At the transition from childhood to adolescence period, our bodies produce certain hormones which lead to bodily changes called Puberty. Puberty is natural way of transforming a child into an adult. Puberty is the stage where both girls and boys will go through many changes including physical, emotional, psychological and social. While both girls and boys go through puberty, girls in general reach puberty and sexual maturity at earlier ages than boys do. Some of us develop faster and some later. Puberty normally occurs from the ages 10-16 ...
Going Through Puberty: A Boys Manual for Body, Mind, and Health Adolescence Childrens Nonfiction Ebook by Ruth Hickman, Md Hickman Ruth J., Ruth J. Hickman, Md Ruth J. Hickman,
Hi Im a 13yo turning 14yo male. Is this a sign of me going through puberty. When I masterbait I produce some liquid and I have a couple of hairs growing down there.
Learning how to sing when going through puberty will prevent you from becoming frustrated and possibly even damaging your voice. Patience is key, but there are some exercises and things you can do to ease your vocals through this transformative process.
Diagnosis and conservative treatment of hormonal disorder in women during sexual maturation (costs for program #168925) ✔ Charite University Hospital Berlin ✔ Department of Pediatric Gastroenterology and Metabolic Medicine ✔ BookingHealth.com
Fascinating! This is consistent with the integral role of the timing of developmental processes in the development of phenotypic traits. There is resurgence in evolutionary biology (including within the neurosciences--which I discuss in my recent JevoHealth paper on play and human brain development) in recognizing the role of heterochrony (changes in timing of developmental processes in a descendant relative to its ancestors) in the evolution of new or altered traits. Evolution acts most powerfully through that which is easiest to change--which often turns out to be the timing of developmentally-programmed traits. If the modern world keeps up its leptinogenic environment, we may find the trait of early sexual maturity become canalized in our species. I wonder what the long-term consequences of this would be for human society and civilization. Sounds like a fascinating topic for a sci fi story, because it will take too many generations for the human species to lose its phenotypic plasticity in ...
As eagle cam watchers might recall, sucker fish rise in the spring and early summer to spawn on gravel beds and sand bars. Every year, Dad Decorah and Mr. North haul in suckers by the dozens once the run starts, sometimes bringing in more than one at a time! However, Longnose Sucker dont become sexually mature until they are between five and nine years of age, while White Sucker dont reach sexual maturity until they are three to eight years old. This means that spawning suckers are a minimum of three years old at spawning, and could easily be older. Finally, my large old bones make sense! Do we know that these fish are suckers? No - but age and size as determined by the opercular bones fit the species, especially given the presence of suckers as identified by local fishing guides, their age at sexual maturity, the amount of sand and gravel bars in the area, and the seeming preference of eagles for suckers when given the choice between suckers and, say, trout. Bob would love this, since he ...
reproductive system - Reproductive Cells and Gonads - The basic organs of sexual reproduction are the gonads, which are ovaries in females and testes in males. The gonads are dormant until they are activated by hormones at sexual maturity. (See also Sexuality.)The male gametes, called spermatozoa or sperm, are produced in the testes. Spermatozoa are microscopic tadpole-shaped cells with long tails. In all invertebrates the testes are internal, but in most mammals, including humans, they lie in an external sac called the…
Girls from low-income families in the U.S. are unprepared for puberty and have largely negative experiences of this transition, according to researchers at Columbia Universitys Mailman School of Public Health and the Johns Hopkins Bloomberg School of Public Health. Their latest paper on the puberty experiences of African-American, Caucasian, and Hispanic girls living mostly in urban areas of the Northeastern U.S. shows that the majority of low-income girls feel they lack the information and readiness to cope with the onset of menstruation. The research is one of the first comprehensive systematic reviews of the literature on puberty experiences of low-income girls in the U.S.. The findings are published online in the Journal of Adolescent Health.. Puberty is the cornerstone of reproductive development, said Marni Sommer, DrPH, MSN, RN, associate professor of Sociomedical Sciences at the Mailman School of Public Health. Therefore, the transition through puberty is a critical period of ...
The body weight (BW) and shank length (SL) varied significantly (p≤0.01) among the generations, hatches and sexes. The least squares mean of SL at six weeks, the primary trait was 77.44±0.05 mm. All the production traits, viz., BWs, age at sexual maturity, egg production (EP) and egg weight were significantly influenced by generation. Model four with additive, maternal permanent environmental and residual effects was the best model for juvenile growth traits, except for zero-day BW. The heritability estimates for BW and SL at six weeks (SL6) were 0.20±0.03 and 0.17±0.03, respectively. The BV of SL6 in the population increased linearly from 0.03 to 3.62 mm due to selection. Genetic trend was significant (p≤0.05) for SL6, BW6, and production traits. The average genetic gain of EP40 for each generation was significant (p≤0.05) with an average increase of 0.38 eggs per generation. The average inbreeding coefficient was 0.02 in PD-1 line ...
TY - JOUR. T1 - Enhanced at puberty 1 (EAP1) is a new transcriptional regulator of the female neuroendocrine reproductive axis. AU - Heger, Sabine. AU - Mastronardi, Claudio. AU - Dissen, Gregory A.. AU - Lomniczi, Alejandro. AU - Cabrera, Ricardo. AU - Roth, Christian L.. AU - Jung, Heike. AU - Galimi, Francesco. AU - Sippell, Wolfgang. AU - Ojeda, Sergio R.. PY - 2007/8/1. Y1 - 2007/8/1. N2 - The initiation of mammalian puberty and the maintenance of female reproductive cycles are events controlled by hypothalamic neurons that secrete the decapeptide gonadotropin-releasing hormone (GnRH). GnRH secretion is, in turn, controlled by changes in neuronal and glial inputs to GnRH-producing neurons. The hierarchical control of the process is unknown, but it requires coordinated regulation of these cell-cell interactions. Here we report the functional characterization of a gene (termed enhanced at puberty 1 [EAP1]) that appears to act as an upstream transcriptional regulator of neuronal networks ...
A tale from the history of human biology brings out the point. John Arbuthnot, an eighteenth-century British physician, noted a fact that greatly surprised him. Studying the registry of births in London between 1629 and 1710, he found that all of the years he reviewed showed a preponderance of male births: in his terms, each year was a male year. If you were a mad devotee of mechanistic analysis, you might think of explaining this-in principle-by tracing the motions of individual cells, first sperm and eggs, then parts of growing embryos, and showing how the maleness of each year was produced. But there is a better explanation, one that shows the record to be no accident. Evolutionary theory predicts that for many, but not all, species, the equilibrium sex-ratio will be 1:1 at sexual maturity. If it deviates, natural selection will favor the underrepresented sex: if boys are less common, invest in sons and you are likely to have more grandchildren. This means that if one sex is more likely ...
The 1st Hong Kong Public Health Forum cum Inauguration of the School of Public Health, The University of Hong Kong, Hong Kong, 20 September 2009, p. 91 ...
Among many environmental factors, social factors, especially olfactory cues, can profoundly influence the timing of puberty onset. This is particularly well established in the house mouse (Mus...
London, Sep 9 (IANS) When young teenagers reach puberty, both girls and boys tend to experience a rapid drop in the number of calories that they burn, finds a new study. The research, that also explains the dramatic rise in childhood obesity in puberty, found that 15-year-olds use 400 to 500 fewer calories while at rest per day compared to when they were 10-years-old - a fall of around a quarter. This was particularly surprising as it is a period of rapid growth, and growth uses lots of calories, the researchers said.. However, by the age of 16, their calorie expenditure begins to climb once again. In addition, the study also found that teenagers exercise less during puberty, adding to the calorie excess that underlies obesity. This exercise drop is particularly stark in girls, whose activity level drops by around a third between the ages of seven and 16.. When we looked for an explanation for the rising obesity in adolescence, we were surprised to find a dramatic and unexpected drop in the ...
Work Accomplished. The overall goal of this project is to develop a fundamental understanding of processes controlling marine mollusc reproductive maturation. In order accomplish this goal the specific research objectives of this proposal were to 1) characterize tissue specific transcriptomic resources for the geoduck and 2) identify proteins that play a role in geoduck reproductive maturation.. The first step in this project was collecting clams at different reproductive stages as determined through histological analysis. Gonadal tissue from 70 geoducks was sampled in batches of about eight per week over the span of two months from November 2014 to early January 2015. Hundreds of images were analyzed and reproductive status was determined for each individual.. Based on histological determination of reproductive maturational stage, seven female and six male paraffin-embedded gonad samples were selected for construction of RNA-seq libraries. A total of 443,468,476 reads were obtained and the de ...
Helpful, trusted answers from doctors: Dr. Goldenberg on height percentile boys: You reach puberty. Growth occurs through stage IV of sexual maturation in males & ceases in stage v, between 18-21 years of age. If youre concerned about short stature, consult your physician.
List changes in the body that take place at puberty. The changes take place differently in the body of boys and girls at puberty. These change may be listed as
Adolescence begins with the biological changes accompanying puberty. More broadly speaking, however, puberty is used as a collective term to refer to all the physical changes that occur in the growing girl or boy as the individual passes from childhood into adulthood. Emotional Transition Biological changes usher in a phase of emotional transition during adolescence,…
ISBN 9780988449992 Puberty is an exciting yet challenging time for every boy. Respecting the universal yet unique experience of puberty for every boy, this book , also find 9780988449992 barcode , images and shopping info of ISBN 9780988449992
1 Answer - Posted in: crohns disease, delayed puberty, puberty, axiron - Answer: Im sorry but what do you mean by your manhood hasnt dropped? ...
My daughter will turn nine next month. Retrouvez Celebrate Your Body (and Its Changes, Too! The Girls Body Book, Fifth Edition: Everyday You Need to Know for a Healthy, Happy You! This book is fully illustrated and is also very helpful for teachers who are looking for resources for health class. Menstruation can feel like a big deal to a young lady, especially if it hasnt happened yet. The book Whats Happening to Ellie? This book is the ultimate guide to everything growing up (and we mean everything) from changing bodies, to new feelings and everything in between. A post shared by ASD Creation Station (@asdcreationstation) Talking and explaining puberty to an adolescent girl is understandably tough, especially if the child is on the autism spectrum. Although not all information about consent, building romantic relationships, and starting a family is given in this book, it is still a great starting point for parents to familiarize their adolescent kids with sex and intimacy. The Girls Body ...
Sexual maturation is associated with increasing levels of sex steroids. These steroidal events are the result of complex changes that occur at several functional levels including the hypothalamus, pituitary, gonad and adrenal gland. These changes, as outlined in Table 3, are often interrelated.. While considerable progress has been made in our understanding of the hormonal events associated with sexual maturation, many important questions remain unanswered. Further intensive investigation will be required before we have a lucid understanding of the physiological basis of the sequence of hormonal events which occur during the pubertal process.. ...
During puberty, young teens not only experience changes to their body, but to their minds as well. Some of your experiences have to do with the physical changes of this age, including shifts in your hormones and a brain thats developing just like your body is. Others have to do with social pressures-worries about your changing looks, the demands of school, and the pressure to fit in.. Your emotions may become stronger and more intense. One minute a person may feel on top of the world, and the next minute they may feel down in the dumps. Feeling really sad can be difficult. If this happens, talking with parents or other adults you trust for support can be helpful.. A person may also have more sexual thoughts and urges. Girls and boys probably start feeling sexually or romantically attracted to guys, girls, or both. Some teens find that theyre turned on (horny) a lot. As they get older, these feelings probably wont be as strong. Some teens choose to masturbate to release sexual feelings, and ...
The gene explains 39% of the variation for when salmon reach sexual maturation. This is uncommon, as sexual maturation is thought to usually be controlled by a large number of genes. The team found that in a specific area of the gene, there are two variants that determine whether a salmon returns to the river to spawn as a small or large fish. Salmon that have two copies of the small gene variant will almost certainly become sexually mature while still relatively small. Salmon with two copies of the large gene will almost certainly not reach maturation until they have grown larger. The right combination However, what is unique about this discovery is that for salmon that have one of each variant, gender determines when the fish will mature, and thus how big it will be. There is very little prior research showing that gender plays a role in how a gene is expressed, says Nofima scientist Celeste Jacq, one of the authors of the article published in Nature. This research will be very useful in ...
Big Mouth, the Netflix show Nick Kroll created with childhood best friend Andrew Goldberg, offers a comedic exploration of the trials and triumphs of adolescence. Now in a second season, the show leverages its creators experiences with puberty to help teenagers -- and their parents -- feel less alone. Kroll shares his Brief But Spectacular take on blooming late and bringing characters to life.
Just like their female counterparts, male kitties go into puberty when they reach around 6 months of age. At this time, your little boy will become sexually mature and able to reproduce. Hell also ...
Will your son experience puberty six months to two years earlier than you expected? The newest research says yes. A study conducted by the American Ac...
As you prepare to grow into a beautiful, confident young lady, it can be exciting, but also scary. Dont worry! Read our list of 8 stages and signs of puberty!
If you are worried sick about your teenagers weight, heres the reason. When young teenagers reach puberty, both girls and boys tend to experience a rapid drop in the number of calories they burn, finds a new study. The research, that also explains the dramatic rise in childhood obesity in puberty, found that 15-year-olds use…
After an entertaining book to read? Looking for the perfect book to gift to your dad/mother/sister/anyone. This article showcases our top picks for the best
Caring Minds is the first of its kind, state-of-the-art, multi-speciality institute of mental health in Eastern India. Sprawling across 8000 sq. ft, this one-stop shop houses a diverse team of seasoned professionals who provide their expert services to all issues related to the mind, both clinical and non clinical under one roof ...
During an coming on The Today Show this morning, Justin Bieber was strike with tough questions.. For instance, host Matt Lauer asked, does the thespian fright which a becoming different voice will have him reduction renouned with the ladies?. No, I mean, my voice is really becoming different gradually, he said. Its really reduce than it was the final time I was with you, right? I think which everybodys voice changes… I have a good outspoken manager thats assisting me.. ...
Hi all quick question, Dd is 9 in a few months and in my opinion seeming to be quite hormonal and now I think is the time for our girly chat. Would
A female dogs menstruation, more commonly referred to as estrus, occurs when she reaches puberty and is able to become pregnant with puppies. Although the onset of puberty varies from breed to breed, pet parents can expect their female dog to experience her first estrus around 6 months old. During estrus, female ...
The Saban Research Institute of the Childrens Hospital, Los Angeles found that the age when a child enters puberty is the primary influence on their bone
Lately it seems like my healthy staff has decided to go back to my younger years! Ive had involuntary spontaneous ejaculations! 4 over thos weekend. No urine, which would mea
Early Sexual Maturity and Milk Hormones - This archives is presented to assist our visitors in taking a pro-active part in their own health
Hi, Thank you for your query on Healthcare Magic. During pubertal period, testes will enlarge because of hormonal effect. And the size of both testes is not same even though they looks of same size. Left testes is usually lower in comparison to the right one. Testicular cancer is a very uncommon...
One can quote ad infinitum the achievements of women in sport over the past few decades. Public attention is being drawn to women athletes who have excelled in areas of specialisation. For every athlete who achieves national or international recognition, there are hundreds of women who are striving to work their way up the pyramid.
CS1 maint: discouraged parameter (link) Neyzi, Olcay; Hülya Alp; Alper Orhon (1975). "Sexual maturation in Turkish girls". ...
Rivest, RW (1991). "Sexual maturation in female rats: hereditary, developmental and environmental aspects". Experientia. 47 (10 ... Sizonenko, PC; Aubert, ML (1986). "Neuroendocrine changes characteristic of sexual maturation". Journal of Neural Transmission ... "A developmental study of the gonadotropin-releasing hormone neuronal system during sexual maturation in the male Djungarian ...
... the word puberty describes the physical changes to sexual maturation, not the psychosocial and cultural maturation denoted by ... Rivest RW (1991). "Sexual maturation in female rats: hereditary, developmental and environmental aspects". Experientia. 47 (10 ... Sizonenko PC, Aubert ML (1986). "Neuroendocrine changes characteristic of sexual maturation". Journal of Neural Transmission. ... "A developmental study of the gonadotropin-releasing hormone neuronal system during sexual maturation in the male Djungarian ...
Sexual maturation is the beginning of periodic ovulation. Ovulation is the regular release of one oocyte from the ovary into ... Oocyte maturation is the following phase of oocyte development. It occurs at sexual maturity when hormones stimulate the oocyte ... Different timing of maturation: oogenic meiosis is interrupted at one or more stages (for a long time) while spermatogenic ... It is in this period or in some cases at the beginning of sexual maturity that the primary oocytes secrete proteins to form a ...
"Sexual maturation in free-ranging Chilabothrus angulifer (Serpentes: Boidae)". Phyllomedusa. 15 (2): 163-174. doi:10.11606/issn ... This species reaches maturation for breeding at 3 years old for males, and 5 years old for females. Captive snakes reach ...
These gonadotropic hormones lead to sexual maturation and gametogenesis. Disrupting GPR54 signaling can cause hypogonadotrophic ... The onset of puberty is marked by an increase in gonadotropin secretion, which leads to sexual maturity and the ability to ... The major role kisspeptin/GPR54 plays in sexual development was initially found in sexually immature humans and mice who had ...
The sexual maturation process produces sexual interest and stimulates thought processes. Subsequent sexual behavior starts with ... sexual reproduction, sexual intercourse, human sexual behavior, and other aspects of sexuality, such as body image, sexual ... Development of one's sexual self-concept can occur even before sexual experiences begin. An important part of sexual self- ... "Sexual self-concept and sexual self-efficacy in adolescents: a possible clue to promoting sexual health?". Journal of Sex ...
Both males and females reach sexual maturation after two years. Harrison (1967) found that eggs hatched in 43-45 days, but ...
Sexual maturation occurs during the first reproductive season after birth. The length of the reproductive season can vary based ... Sexual maturity in males is recognized by a brood pouch. Males have two common yet very aggressive courtship behaviours. The ...
Other notable themes in the series are the role of family and friendship; sexual maturation and the conflicting worldviews of ...
Ellis, P.E.; Carlisle, D.B.; Osborne, D.J. (1965). "Desert locusts: sexual maturation delayed by feeding on senescent ...
Sexual maturation is attained after 4-6 weeks of initial infection. A female generally lays 500-1,000 eggs in a day. The female ... to attain full maturation. To evade detection by the host's immune system, the adults have the ability to coat themselves with ...
Sexual maturation in male and female cephalopods can be observed internally by the enlargement of gonads and accessory glands. ... Mating would be a poor indicator of sexual maturation in females; they can receive sperm when not fully reproductively mature ... An indication of sexual maturity of females is the development of brachial photophores to attract mates. Cephalopods are not ... The blanket octopus male is an example of sexual-evolutionary dwarfism; females grow 10,000 to 40,000 times larger than the ...
1965) Desert locusts: sexual maturation delayed by feeding on senescent vegetation. Science 149: 546-547 (abstract (with link ... 1965) Desert locusts: sexual maturation delayed by feeding on senescent vegetation. Science 149: 546-547 (abstract (with link ... She also worked on the effects of plant hormones on insects, showing that sexual maturity in desert locusts is regulated by ...
Clark, B. R.; Price, E. O. (1981). "Sexual maturation and fecundity of wild and domestic Norway rats (Rattus norvegicus)". ... They reach sexual maturity in about five weeks. Under ideal conditions (for the rat), this means that the population of females ... This is because they grow quickly to sexual maturity and are easy to keep and to breed in captivity. When modern biologists ... McCormick, CM; Cameron, CM; Thompson, MA; Cumming, MJ; Hodges, TE; Langett, M (2017). "The sexual preference of female rats is ...
This constant increase in the likelihood of a long-term relationship can be explained by sexual maturation and the development ... Sexual events (such as sexual touching, sexual intercourse) were less common than romantic events (holding hands) and social ... The production of these hormones increases gradually until sexual maturation is met. Some boys may develop gynecomastia due to ... However, early puberty is not always positive for boys; early sexual maturation in boys can be accompanied by increased ...
This occurs only later during intrauterine development when sexual maturation is reached. During intrauterine development, ... They have the same likelihood as a karyotypically XX woman of enjoying sexual pleasure but are unable to biologically reproduce ... These women often have primary and secondary sexual characteristics typical of other women; however, they are karyotypically XY ...
The goal is to complete sexual maturation over 2 to 3 years. Once sexual maturation has been achieved, a trial period with no ... Since bone maturation is a good indicator of overall physical maturation, an x-ray of the left hand and wrist to assess bone ... Gandhi J, Dagur G, Warren K, Smith NL, Sheynkin YR, Zumbo A, Khan SA (2017). "The Role of Diabetes Mellitus in Sexual and ... Although absence of pubic and/or axillary hair is common in children with delayed puberty, the presence of sexual hair is due ...
ISBN 978-0-88359-048-5. Shine, Richard (1978). "Growth Rates and Sexual Maturation in Six Species of Australian Elapid Snakes ...
Benedet Perea, Susana (2008). Growth hormone and somatolactin function during sexual maturation of female Atlantic salmon. (Ph. ...
62-. ISBN 978-1-4612-5525-3. Presl, J.; Hořejší, J.; Štroufová, A.; Herzmann, J. (1976). "Sexual maturation in girls and the ... Escamilla, Roberto F.; Lisserf, H. (1940). "Induction of menarche and development of secondary sexual characteristics in a ...
Clinical outcomes include depressed growth, diarrhea, impotence and delayed sexual maturation, alopecia, eye and skin lesions, ... In children, deficiency causes growth retardation, delayed sexual maturation, infection susceptibility, and diarrhea. Enzymes ...
Sexual maturation occurs at a disc width of around 20 cm (7.9 in). Despite its small size, the pearl stingray is probably taken ...
Sexual maturation occurs within 3-4 weeks, with fecundity peaking in 8-10 weeks. Nothobranchius furzeri shows no signs of ...
Wolfe L. (1979) "Sexual maturation among members of a transported troop of Japanese macaques". Primates 20(3):411-8. Yotsumoto ... Vasey, P. L. (2002). "Sexual partner preference in female Japanese macaques". Archives of Sexual Behavior. 31 (1): 51-62. doi: ...
Sexual maturation of females depends on population density, as well as availability of food. Young females often flee from an ... Some does may be as young as six months when they reach sexual maturity, but the average age of maturity is 18 months. ... "Major-Histocompatibility-Complex-Associated Variation In Secondary Sexual Traits Of White-Tailed Deer (Odocoileus virginianus ...
... a heterochronic model of sexual and social maturation". Anthropological Review. 78 (2): 109-132. doi:10.1515/anre-2015-0009. ... Delayed human sexual maturity also led to the evolution of menopause with one explanation providing that elderly women could ... Darwin applied the theory of evolution and sexual selection to humans in his 1871 book The Descent of Man, and Selection in ... The reduced degree of sexual dimorphism in humans is visible primarily in the reduction of the male canine tooth relative to ...
Norris, Maud J. (1964). "Accelerating and inhibiting effects of crowding on sexual maturation in two species of locusts". ... She examined the role of chemicals in aggregation and locust development and maturation. In 1954 she demonstrated the first ... was an English entomologist known for her work on insect pheromones and the physiology of insect development and maturation. A ...
Lombardi JR, Vandenbergh JG (1977). "Pheromonally induced sexual maturation in females: regulation by the social environment of ...
A heterochronic model of sexual and social maturation". Anthropological Review. 78 (2): 109-132. doi:10.1515/anre-2015-0009. ... The female raises offspring one at a time with a maturation period of about eight years. This is the longest maturation period ... The features of the upper canine in A. ramidus contrast with the sexual dimorphism observed in common chimpanzees, where males ... parenting and sexual psychology. Previously, it was assumed that such ancient human ancestors behaved much like chimps, but ...
Sexual. *Ego-dystonic sexual orientation. *Paraphilia *Fetishism. *Voyeurism. *Sexual maturation disorder. *Sexual relationship ...
Clark, B. R.; Price, E. O. (1981). "Sexual maturation and fecundity of wild and domestic Norway rats (Rattus norvegicus)". ... They reach sexual maturity in about five weeks. Under ideal conditions (for the rat), this means that the population of females ... This is because they grow quickly to sexual maturity and are easy to keep and to breed in captivity. When modern biologists ... McCormick, CM; Cameron, CM; Thompson, MA; Cumming, MJ; Hodges, TE; Langett, M (2017). "The sexual preference of female rats is ...
... "sexual orientation by itself is not to be considered a disorder")[3] *(F66.0) Sexual maturation disorder ... F52) Sexual dysfunction, not caused by organic disorder or disease *(F52.0) Lack or loss of sexual desire *Frigidity ... F52.8) Other sexual dysfunction, not caused by organic disorder or disease. *(F52.9) Unspecified sexual dysfunction, not caused ... F66) Psychological and behavioural disorders associated with sexual development and orientation (Specifically states that " ...
Glia maturation factor (GMF). *Hepatoma-derived growth factor (HDGF). *Interleukins/T-cell growth factors (see here instead) ...
As part of the pharmacologic treatment of paraphilic disorders in sexual offenders or men with a high risk of sexual offending[ ... Final maturation induction after having performed controlled ovarian hyperstimulation. Usage of GnRH agonist for this purpose ... Turner D, Briken P (January 2018). "Treatment of Paraphilic Disorders in Sexual Offenders or Men With a Risk of Sexual ... sexual dysfunction, vaginal atrophy, osteoporosis, infertility, and diminished sex-specific physical characteristics. They are ...
These mosaics can then be used to analyze such things as courtship behavior,[7] female sexual attraction,[19] and the autonomy ... Acute myeloblastic leukemia with maturation t(8 RUNX1T1;21 RUNX1). *Acute promyelocytic leukemia t(15 PML,17 RARA) ... "A new behavioral bioassay for an analysis of sexual attraction and pheromones in insects". Journal of Experimental Zoology. 192 ... a loss of an X chromosome early in embryonic development can result in sexual mosaics, or gynandropmorphs.[6][7] Likewise, a ...
Plavcan, J. M. (2004). "Chapter 13: Sexual selection, measures of sexual selection, and sexual dimorphism in primates". In ... and the maturation time of the species.[126] Like other primates, strepsirrhines are relatively slow breeders compared to other ... Sexual dichromatism (different coloration patterns between males and females) can be seen in most brown lemur species,[97] but ... This lack of sexual dimorphism is not characteristic of all strepsirrhines.[98] Some adapiforms were sexually dimorphic, with ...
In females with KS/CHH, infertility is primarily due to the lack of maturation of eggs located within the ovaries. Ovulation ... Determining the Tanner stage of sexual development. (Males with KS/CHH are normally at stage I or II with genitalia, females at ... Affected individuals with KS and other forms of HH are almost invariably born with normal sexual differentiation; i.e., they ... For both males and females, the initial aim for treatment is the development of the secondary sexual characteristics normally ...
... is the retention of the larval form beyond the usual age of maturation with the possibility of the development of sexual organs ... Neoteny is found in modern humans.[6] In progenesis (also called paedogenesis), sexual development is accelerated.[7] ... 150).[21] Doug Jones argued that human evolution's trend toward neoteny may have been caused by sexual selection in human ... This is due to sexual dimorphism and an evolutionary change in timing of development.[36] Juveniles became sexually mature ...
This triggers sexual maturity in the fleas and they start producing eggs. As soon as the baby rabbits are born, the fleas make ... The first blood meal triggers the maturation of the ovaries in females and the dissolution of the testicular plug in males, and ... as an extended metaphor for their sexual relationship. The speaker tries to convince a lady to sleep with him, arguing that if ...
Sexual. *Ego-dystonic sexual orientation. *Paraphilia *Fetishism. *Voyeurism. *Sexual maturation disorder. *Sexual relationship ...
... and may also show variable spermatocytic maturation arrest.[3] ... All other sexual functions will remain intact. Contents. *1 ...
"Three Contributions to the Sexual Theory. New York: The Journal of Nervous and Mental Disease Publishing Company.. ... Although more evidence is needed, the relative lack of episodic memories of early childhood may be linked to maturation of ... Using psychoanalytic theory, he postulated that early life events were repressed due to their inappropriately sexual nature. He ... sexual abuse by caretakers) that occurred in the psychosexual development of every child. This supposedly led to the repression ...
Swaab DF, Garcia-Falgueras A (2009). "Sexual differentiation of the human brain in relation to gender identity and sexual ... Maturation continues as the medial aspect of each mesonephros grows to form the gonadal ridge. The gonadal ridge continues to ... Sexual identity is determined at fertilization when the genetic sex of the zygote has been initialized by a sperm cell ... The main male sex organs are the penis and the testicles which produce semen and sperm, which, as part of sexual intercourse, ...
... and sexual activities.[14] There is a complete lack of sexual receptivity, measured as lordosis behavior.[14] There are ... while the brother had Tanner stage II pubic hair development and Tanner stage I gonadal maturation.[6] The right testis of the ... There is little effect on sexual behavior in terms of mounting and sexual attraction to females.[14] However, there is an ... There is a lack of grossly apparent behavioral phenotypes, including in regards to sexual behavior.[14] However, increased ...
Ego-dystonic sexual orientation. *Paraphilia *Fetishism. *Voyeurism. *Sexual maturation disorder. *Sexual relationship disorder ... Erotophobia - fear of sexual love or sexual abuse. *Erythrophobia, erytophobia, ereuthophobia - fear of the color red, or fear ...
T. brucei sexual cycleEdit. T. brucei are able to undergo meiotic sexual reproduction. Meiosis occurs within the salivary ... and the emergence and maturation of the adult. ... However, since the sexual phase of the trypanosome lifecycle ... This mode of transmission also includes the sexual phase of the trypanosomes. Tsetse are believed to be more likely to become ... Gibson W (2015). "Liaisons dangereuses: sexual recombination among pathogenic trypanosomes". Res. Microbiol. 166 (6): 459-66. ...
... that the children's moral maturation process occurred in two phases, the first of heteronomy and the second of autonomy: * ... used as meaning of autonomy on one's own matters including informed consent or sexual and reproductive rights, is integral for ...
Predetermined epigenesis is a unidirectional movement from structural development in DNA to the functional maturation of the ... sexual intercourse, gambling, etc.).[138][139][140][141] Transgenerational epigenetic inheritance of addictive phenotypes has ...
Ego-dystonic sexual orientation. *Paraphilia *Fetishism. *Voyeurism. *Sexual maturation disorder. *Sexual relationship disorder ... Petrak, Jenny; Hedge, Barbara (2003). The Trauma of Sexual Assault: Treatment, Prevention and Practice. John Wiley & Sons. p. ... The risk of developing PTSD after a traumatic event varies by trauma type[33][34] and is highest following exposure to sexual ... Those who have experienced sexual assault or rape may develop symptoms of PTSD.[53][54] PTSD symptoms include re-experiencing ...
First data on sexual maturation and sex-ratio of hake (Merluccius merluccius L.) from ICES divisions VIIIc and IXa. ICES C.M. ... Forma moles denses abans d'adquirir la maduresa sexual (els adults estan més aïllats). ...
... with diminished body size and delayed sexual maturation accompanied by normal lactation.[17] These data indicate that very low ... During pregnancy, pronounced breast growth and maturation occurs in preparation of lactation and breastfeeding.[20][29][30] ... although full sexual maturity is always eventually reached.[15] Moreover, breast development and size are normal (albeit ... at which time lobuloalveolar maturation is complete, the breasts are fully prepared for lactation and breastfeeding.[30] ...
Upon reaching sexual maturity, males move to higher latitudes, where the water is colder and feeding is more productive. ... slow maturation, and high longevity.[32] ... The main driving force for the sexual segregation of adult ... Cranford, T.W. (1999). "The Sperm Whale's Nose: Sexual Selection on a Grand Scale?". Marine Mammal Science. 15 (4): 1133-1157. ...
Sexual maturation disorder. *Ego-dystonic sexual orientation. *Sexual relationship disorder. *Paraphilia *Voyeurism ...
Sexual maturation disorder. *Ego-dystonic sexual orientation. *Sexual relationship disorder. *Paraphilia *Voyeurism ... Impulse control disorders including pathological gambling, compulsive sexual behavior, binge eating, compulsive shopping and ... and altered sexual function.[29] Constipation and impaired stomach emptying (gastric dysmotility) can be severe enough to cause ... such as compulsive sexual activity, eating, gambling and shopping) even more strongly than levodopa.[82] They tend to be more ...
This is especially significant in male cats due to the extreme undesirability of these male cat sexual behaviors for many pet ... "The phosphodiesterase 3 inhibitor ORG 9935 inhibits oocyte maturation in the naturally selected dominant follicle in Rhesus ... In male cats, occurrence of abscesses, aggression toward veterinarians, sexual behaviors, and urine spraying was decreased, ... Early age gonadectomy is associated with an increased incidence of noise phobias and undesirable sexual behaviors[clarify].[68] ...
Stimulates maturation of the follicle, which then in turn secretes estrogen. Unlike most mammals, the mare does not have an ... Progesterone: prevents conception and decreases sexual receptibility of the mare to the stallion. Progesterone is therefore ...
Sexual maturation disorder. *Ego-dystonic sexual orientation. *Sexual relationship disorder. *Paraphilia. *(Voyeurism ... Common side effects include nausea, sexual dysfunction, headache, diarrhea, constipation, restlessness, increased risk of ...
Sexual maturation disorder(英語:Sexual maturation disorder). *Ego-dystonic sexual orientation(英語:Ego-dystonic sexual orientation) ...
It discusses how autumn is both a force of growth and maturation, and deals with the theme of approaching death. While the ... According to critics, the bursting of the grape alludes to the passing from the moment of ultimate sexual pleasure to the ...
Adolescents Self-Assessment of Sexual Maturation Message Subject (Your Name) has sent you a message from American Academy of ... Adolescents Self-Assessment of Sexual Maturation. Paula M. Duke, Iris F. Litt and Ruth T. Gross ... The variability in time of onset and progression of puberty warrants the use of stage of sexual maturation rather than ... The necessity to undress the teenager has seriously curtailed the application of stage of sexual maturation to behavioral and ...
... 4.2.1 Males. Male germ cell differentiation occurs continuously in the ... At this point, also called the dictyate stage, the oogonia become arrested and remain quiescent until sexual maturation. As ... The final stage of sperm maturation known as capacitation is required for fertilizing activity and does not occur until after ...
Delay in sexual maturation in perinatally HIV-infected youths is mediated by poor growth.. Bellavia A1, Williams PL, DiMeglio ... To evaluate the association between HIV infection and sexual maturation, and mediation of this association by HIV effects on ... Delay in Sexual Maturation in Perinatally HIV-Infected Youth Is Mediated by Poor Growth ... Delay in Sexual Maturation in Perinatally HIV-Infected Youth Is Mediated by Poor Growth ...
UC Davis scientists have discovered that the timing of brain maturation is associated with the timing of puberty. [en español] ... Teen sleep study shows link between timing of brain and sexual maturation Outcome provides important benchmark for evaluating ... Their study -- "Sex, Puberty and the Timing of Sleep EEG Measured Adolescent Brain Maturation" -- was funded by the U.S. Public ... UC Davis scientists have discovered that the timing of brain maturation is associated with the timing of puberty. ...
The effects of maturation on the adolescent ECG were explored using sexual maturity rating (SMR) as a marker. ECGs were ... Sexual Maturity Rating: A Marker for Effects of Pubertal Maturation on the Adolescent Electrocardiogram. Elisabeth M. Stafford ... Sexual Maturity Rating: A Marker for Effects of Pubertal Maturation on the Adolescent Electrocardiogram ... Sexual Maturity Rating: A Marker for Effects of Pubertal Maturation on the Adolescent Electrocardiogram ...
Severe mental deficiency, proportionate dwarfism, and delayed sexual maturation. A distinct inherited syndrome ... Cantú, J.M., Sánchez-Corona, J., García-Cruz, D. et al. Severe mental deficiency, proportionate dwarfism, and delayed sexual ... and delayed sexual development. A recessive mode of inheritance, either autosomal or X-linked, is assumed. ... maturation. Hum Genet 56, 231-234 (1980). https://doi.org/10.1007/BF00295702 ...
Here, we tested whether sexual selection shapes the rate of posteclosion maturation in the fruit fly Drosophila melanogaster. ... These results suggest that a major aspect of male maturation involves developing traits that increase success in sexual ... Moreover, rates of juvenile development and adult maturation can readily evolve in opposite directions in the two sexes, ... Furthermore, monogamous populations evolved faster development and maturation of females relative to polygamous populations, ...
EE-YUNG CHUNG, YOUNG-JE PARK, JEONG-YONG LEE, and DONG-KI RYU "GERM CELL DIFFERENTIATION AND SEXUAL MATURATION OF THE HANGING ... EE-YUNG CHUNG, YOUNG-JE PARK, JEONG-YONG LEE, DONG-KI RYU "GERM CELL DIFFERENTIATION AND SEXUAL MATURATION OF THE HANGING ... GERM CELL DIFFERENTIATION AND SEXUAL MATURATION OF THE HANGING CULTURED FEMALE SCALLOP PATINOPECTEN YESSOENSIS ON THE EAST ... Gonadosomatic index, germ cell differentiation, ovarian cycle and first sexual maturity in female Patinopecten yessoensis were ...
Premature sexual maturation: incidence and aetiology. S Stanley, E Stone & J Kirk. ... we have seen increasing numbers of referrals to our regional paediatric endocrine unit with premature sexual maturation (PSM), ...
Age (r=.72), height (r=.81), weight (r=.84), body surface area (r=.87), sexual maturation (r=.75), lean body mass (r=.86), fat ... Sexual Maturation Pubertal staging was determined by physical assessment. Examiners of boys were male and examiners of girls ... Sexual maturation was a significant univariate correlate of left ventricular mass, but it did not remain significant in the ... The role of sexual maturation in determining left ventricular mass has not been studied extensively. In the Muscatine Study, ...
Gonadotrophins are special hormones that activate the sexual glands. These sexual glands are the testes in boys and the ovaries ... Define adolescent sexual development and puberty *Explain the two types of physical changes, and how they affect boys and girls ... Adolescent Sexual Development. The talk. The birds and the bees. Those dreaded human growth and development films you were ... Once these sexual glands are activated, they begin to release their own hormones that result in physical changes throughout the ...
The early production of JH was reflected in a more rapid ovarian maturation although the data suggest that sexual maturation in ... Juvenile hormone production and sexual maturation in true armyworm, Pseudaletia unipuncta (HAW) (Lepidoptera: Noctuidae): a ... sexual maturation is delayed under short-day, low-temperature conditions. Based on these results and on the observation that ...
Juvenile hormone production and sexual maturation in the true armyworm, Pseudaletia unipuncta: a comparison of migratory and ...
The goal of this study was to identify genes that may be involved in sexual maturation in experimentally matured eels. For this ... This study shows that the brains of eels undergo major changes at the molecular level at sexual maturity that may include re- ... levels of several receptors and channels were observed suggesting that some rewiring is occurring in the brain at sexual ... The vertebrate brain plays a critical role in the regulation of sexual maturation and reproduction by integrating environmental ...
Dietary plant oils delay early sexual maturation compared with marine fish oil in male European seabass (Dicentrarchus labrax ... Dietary plant oils delay early sexual maturation compared with marine fish oil in male European seabass (Dicentrarchus labrax ... Dietary plant oils delay early sexual maturation compared with marine fish oil in male European seabass (Dicentrarchus labrax ...
Evidence of late-summer mating readiness and early sexual maturation in migratory tree-roosting bats found dead at wind ... www.windaction.org/posts/40614-evidence-of-late-summer-mating-readiness-and-early-sexual-maturation-in-migratory-tree-roosting- ... Ovaries of all females sampled had growing secondary or tertiary follicles, indicating sexual maturity even in first-year ...
The potential of alternative lighting-systems to suppress pre-harvest sexual maturation of 1+ Atlantic salmon (Salmo salar) ... The potential of alternative lighting-systems to suppress pre-harvest sexual maturation of 1+ Atlantic salmon (Salmo salar) ... Maximal suppression of pre-harvest sexual maturation can be achieved in the Atlantic salmon on-growing industry using ... Salmo salar; lighting-technology; light-intensity; sexual maturation; melatonin; Atlantic salmon; Photoperiodism; Fishes Growth ...
At follow-up, early sexual maturation in girls, but not in boys, was associated with overweight. This association, however, was ... We have prospectively examined the influence of early sexual maturation on subsequent overweight in late adolescence and ... Early sexual maturation has been associated with overweight that may persist after the completion of biological growth and ... Adolescent self-assessment of sexual maturation. Effects of fatness classification and actual sexual maturation stage. J ...
Sexual maturation of European eels (Anguilla anguilla) occurs during and/or after the approximately 6,000km migration from ... Sexual maturation of European eels (Anguilla anguilla) occurs during and/or after the approximately 6,000km migration from ... Simulated migration enhances sexual maturation of farmed European eels February 12, 2016. By Siri Elise Dybal ... non-migrating controls, indicating an advancement of sexual maturation. The EI was significantly higher in migrant males (14.0 ...
Sexual Difference in Maturation of Northeast Arctic Cod A. Ajiad, T. Jakobsen and O. Nakken. Institute of Marine Research, P.O ... Management Implications of Sexual Differences in Maturation and Spawning Mortality of Northeast Arctic Cod. ... Splitting the spawning stock into males and females shows that the earlier maturation in males has a larger impact on the sex ... There is evidence of earlier maturation in males than in females and indications of higher mortality among mature males than ...
... and sexual maturation and mating processes are crucial. However, our knowledge of the reproductive genes involved in sexual ... This study supplied female reproductive genes involved in sexual maturation and the post-mating response in B. dorsalis, based ... Here, we used a high-throughput sequencing method to identify multiple genes potentially involved in sexual maturation and ... Additionally, we identified multiple DEGs during sexual maturation that are involved in reproduction, and expression pattern ...
... Sexual maturation as a source of variation in the relationship between cadmium concentration and body weight of Mytilus edulis ... Sexual maturation as a source of variation in the relationship between cadmium concentration and body weight of mytilus edulis ... Sexual maturation as a source of variation in the relationship between cadmium concentration and body weight of mytilus edulis ...
These findings may be related with some remodeling processes in the accessory glands during sexual maturation, which could be ... of male rabbits during sexual maturation. We showed that p75 was expressed in all tissues studied with similar mRNA levels ... in rabbit male reproductive tract during sexual maturation. "Reproduction in Domestic Animals", v. 53 (n. 2); pp. 62-65. ISSN ... in rabbit male reproductive tract during sexual maturation ... in rabbit male reproductive tract during sexual maturation. ...
... premature sexual maturation can reveal severe conditions and need a thorough evaluation to identify its cause and potential for ... factors affecting normal pubertal development to improve the recognition and proper management of premature sexual maturation. ... Premature sexual maturation is a frequent cause for referral in paediatric endocrinology. Although clinical evaluation will ... Premature sexual maturation Premature sexual maturation. Chapter:. Premature sexual maturation. Author(s):. Jean-Claude Carel. ...
However, the mechanisms by which pairing facilitates sexual maturation are yet to be investigated. Parasites isolated from ... The results suggested that after pairing, specific miRNAs regulated gene expression to lead to female sexual maturation. ... Conversely, the predicted target genes of bantam were related to the embryo development, development of primary sexual ... The pairing of males and females leads to female sexual maturation and maintains this mature state. ...
Sexual maturation and changes in water and salt transport components in the kidney and intestine of three-spined stickleback ( ... Salt-absorptive activity in the intestine may, however, be down-regulated during male maturation. ...
Gender and sexual maturation-dependent contrasts in the neuroregulation of growth hormone secretion in prepubertal and late ... Gender and sexual maturation-dependent contrasts in the neuroregulation of growth hormone secretion in prepubertal and late ... Gender and sexual maturation-dependent contrasts in the neuroregulation of growth hormone secretion in prepubertal and late ... T1 - Gender and sexual maturation-dependent contrasts in the neuroregulation of growth hormone secretion in prepubertal and ...
Self-assessment of physical sexual maturation in boys and girls with delayed puberty. Journal of Adolescent Health. 1999 Dec 1; ... Fingerprint Dive into the research topics of Self-assessment of physical sexual maturation in boys and girls with delayed ... Self-assessment of physical sexual maturation in boys and girls with delayed puberty. / Finkelstein, Jordan W.; DArcangelo, M ... We studied 49 boys and girls with delayed physical sexual maturation during treatment with sex steroids. We found significant ...
... sexual exploration and discovery (genitalized body), and self-depreciation (social body). ... Results: Pubertal maturation was associated with higher scores on "Flirting with the aim of having sexual relations" and "Going ... Pubertal maturation, physical self-esteem and sexuality in a sample of French adolescents] Encephale. 2016 Apr;42(2):138-43. ... Aim: The aim of this study was to explore the links between pubertal maturation, physical self-esteem and sexuality in ...
Once the Saiz lab was able to determine the sexual dimorphisms between the two sexes, they then focused on whether the sex of ... Through the sex reversals the Saiz lab discovered that the sexual identity of the PHC neuron is essential to behavior. ... Similar to other organisms throughout the animal kingdom, the C. elegans worm undergoes sexual differentiation to determine the ... Esther Serrano-Saiz and colleagues improved the understanding of male sexual differentiation and development. Through the ...
  • The variability in time of onset and progression of puberty warrants the use of stage of sexual maturation rather than chronologic age in assessing biological and behavioral measures during adolescence. (aappublications.org)
  • In the largest longitudinal study to date of electrical activity in the brains of sleeping adolescents, UC Davis scientists have discovered that the timing of brain maturation is associated with the timing of puberty. (ucdavis.edu)
  • Campbell and Feinberg hope their finding inspires research to determine if neuroendocrine events of puberty drive adolescent brain maturation or if these are independent but parallel processes. (ucdavis.edu)
  • Their study -- "Sex, Puberty and the Timing of Sleep EEG Measured Adolescent Brain Maturation" -- was funded by the U.S. Public Health Service. (ucdavis.edu)
  • Adolescent sexual development occurs during puberty and includes many physical, emotional, and social changes. (study.com)
  • Physical changes at puberty induce two distinct trends in adolescents: sexual exploration and discovery (genitalized body), and self-depreciation (social body). (nih.gov)
  • Puberty is the period during which boys or girls undergo the process of sexual maturation. (majortests.com)
  • Endocrinology of Sexual Maturation and Puberty (Chapter 120). (upenn.edu)
  • The necessity to undress the teenager has seriously curtailed the application of stage of sexual maturation to behavioral and developmental research. (aappublications.org)
  • The extent to which other factors, such as obesity, stage of sexual maturation, and level of blood pressure, determine left ventricular mass has been controversial. (ahajournals.org)
  • The relationship of left ventricular mass with the stage of sexual maturation and with systolic and diastolic blood pressure was also evaluated. (ahajournals.org)
  • Onset of sexual maturation was within the first third of life. (copernicus.org)
  • Growth curves revealed differences in growth and maturation strategies within taxa that could indicate sexual dimorphism expressed in different adult sizes and a different onset of sexual maturation. (copernicus.org)
  • The onset of sexual maturation in young adults. (encyclopedia.com)
  • Over the last few years, we have seen increasing numbers of referrals to our regional paediatric endocrine unit with premature sexual maturation (PSM), especially adrenarche and isolated thelarche. (endocrine-abstracts.org)
  • Premature sexual maturation is a frequent cause for referral in paediatric endocrinology. (oxfordmedicine.com)
  • Although clinical evaluation will suffice to reassure the patient and family in a majority of cases, premature sexual maturation can reveal severe conditions and need a thorough evaluation to identify its cause and potential for progression, in order to propose an appropriate treatment (1). (oxfordmedicine.com)
  • One of the main ongoing controversial issues in the area is the definition of normal pubertal development and there is a need for longitudinal assessments of normally developing children in the various areas of the world and of a better understanding of the factors affecting normal pubertal development to improve the recognition and proper management of premature sexual maturation. (oxfordmedicine.com)
  • We evaluated age at sexual maturity among 2539 PHIV and PHEU adolescents based on annual physician-assessed pubertal staging measures. (nih.gov)
  • The purpose of this investigation was to evaluate the effects of lean body mass, fat mass, blood pressure, and sexual maturation on left ventricular mass in children and adolescents. (ahajournals.org)
  • The objective of this study was to assess the association among sexual maturation (SM), overweight and central adiposity in children and adolescents. (bvsalud.org)
  • Several studies around the world concerning obesity address adolescents because of biopsychosocial changes occurring at this life stage, as well as the proximity to biological maturation, which allows for opportunities to prevent health problems in adult age. (bvsalud.org)
  • To establish the optimal age of sexual maturation in Egyptian children , Tanner's maturity stages were determined for a sample of children and adolescents [1550 girls , 1563 boys ] ranging from 6.5 to 18.5 years. (bvsalud.org)
  • Declarations urged that governments, nongovernmental organizations and the private sector prioritize programmes such as education, income-generating opportunities, vocational training, and health services for adolescents, including services related to sexual and reproductive health. (who.int)
  • Older adolescents aged 15-19 years have drawn the lion's share of attention, while the special needs and concerns of younger adolescents aged 10-14 years - some of whom are already sexual y active - have been relatively neglected. (who.int)
  • Internal exposure to pollutants and sexual maturation in Flemish adolescents. (medscape.com)
  • Furthermore, monogamous populations evolved faster development and maturation of females relative to polygamous populations, with no detectable trade-offs with adult size or egg-to-adult survival. (epfl.ch)
  • Previous work on North American populations of the true armyworm, Pseudaletia unipuncta , has shown that (1) ovarian development, pheromone synthesis, and the onset of calling (behavior associated with the emission of the sex pheromone) in virgin females are positively correlated with an increase in juvenile hormone (JH) production, and (2) sexual maturation is delayed under short-day, low-temperature conditions. (gc.ca)
  • Ovaries of all females sampled had growing secondary or tertiary follicles, indicating sexual maturity even in first-year females. (windaction.org)
  • Results of the study indicated that the freshwater migration significantly increased plasma testosterone levels in both migrating males and females, but did not enhance sexual maturation further as no significant increases in gonad weight, gonado-somatic index (GSI) nor eye index (EI) were observed. (hatcheryinternational.com)
  • The subsequent seawater migration significantly increased gonad weight and GSI of the migrant males, and particularly of the females (1.40 ± 0.06 vs. 1.00 ± 0.10) vs. non-migrating controls, indicating an advancement of sexual maturation. (hatcheryinternational.com)
  • There is evidence of earlier maturation in males than in females and indications of higher mortality among mature males than mature females in the Northeast Arctic cod ( Gadus morhua L.) stock. (nafo.int)
  • Splitting the spawning stock into males and females shows that the earlier maturation in males has a larger impact on the sex ratio in the spawning stock than the spawning mortality rates. (nafo.int)
  • The pairing of males and females leads to female sexual maturation and maintains this mature state. (biomedcentral.com)
  • During the process, females still need the constant pairing contact with males to reach sexual maturation. (biomedcentral.com)
  • We then determined dry mass growth and lipid accumulation in the nymphs as well as mass gain and the length of basal oocytes in the adult females as an estimate of sexual maturation. (biologists.org)
  • Large numbers of females attained sexual maturation at the age of yearling, and the pregnancy rate of yearlings and older was 96.4% (n = 28). (biomedsearch.com)
  • It is, however, difficult to isolate the effects of early adiposity from the effects of early maturation. (biomedcentral.com)
  • The results showed that simulating migration under conditions mimicking those likely experienced by migrating eels in nature had significant stimulating effects on early maturation. (hatcheryinternational.com)
  • Moreover, rates of juvenile development and adult maturation can readily evolve in opposite directions in the two sexes, possibly implicating polymorphisms with sexually antagonistic pleiotropy. (epfl.ch)
  • Secondary sex characteristics refer to other visible changes that mark adult maturation. (study.com)
  • A peak increase in transverse diameter coincides with peak height velocity during pubertal maturation. (aappublications.org)
  • The aim of this study was to explore the links between pubertal maturation, physical self-esteem and sexuality in adolescence, differentiating between boys and girls. (nih.gov)
  • Pubertal maturation was associated with higher scores on "Flirting with the aim of having sexual relations" and "Going out with someone", and a drop in overall and physical self-esteem, mainly in socially valued domains, namely "Body fat" for girls, and "Strength" and "Health" for boys. (nih.gov)
  • Clinical manifestations were heterogeneous: some failed to undergo pubertal maturation, and other developed hypergonadotropic amenorrhea following several years of regular menses. (nih.gov)
  • The final stage of sperm maturation known as capacitation is required for fertilizing activity and does not occur until after contact has been made with the milieu of the female reproductive tract. (jax.org)
  • Explanations for the evolution of delayed maturity usually invoke trade-offs mediated by growth, but processes of reproductive maturation continue long after growth has ceased. (epfl.ch)
  • Female reproductive potential plays a significant role in the survival and stability of species, and sexual maturation and mating processes are crucial. (biomedcentral.com)
  • However, our knowledge of the reproductive genes involved in sexual maturation and mating has been largely limited to model organisms. (biomedcentral.com)
  • This study supplied female reproductive genes involved in sexual maturation and the post-mating response in B. dorsalis, based on RNA-seq. (biomedcentral.com)
  • The interaction of p75 with neurotrophins in rabbit male reproductive tract suggests the possible implication of this system in sexual maturation in rabbits. (upm.es)
  • Therefore, we found important biochemical changes along the reproductive cycle that determined the energetic signature in each tissue, though no significant energy trade-offs between tissues were found, suggesting that, on the one hand, female O. vulgaris obtained energy directly from food accumulated simultaneously in the somatic and reproductive tissues during sexual maturation. (frontiersin.org)
  • The processes of anatomical and physiological changes related to sexual or reproductive functions during the life span of a human or an animal, from FERTILIZATION to DEATH. (bioportfolio.com)
  • Initiatives were directed to school retention and education (including sexuality education and life-skil s training), health care (including sexual and reproductive health), and legal issues such as age of consent and minimum age for marriage. (who.int)
  • A major function of the brain is to establish the appropriate developmental and endocrine status for reproduction, and then to co-ordinate this with aspects of behavior and sexual maturation. (biomedcentral.com)
  • The focus on the sex-shared neuron, PHC, allowed for the Dr. Serrano-Saiz to pinpoint an important facet of male sexual development and behavior. (celebrationagainstentropy.com)
  • This discipline concerns the study of SEXUALITY, and the application of sexual knowledge such as sexual attitudes, psychology, and SEXUAL BEHAVIOR. (bioportfolio.com)
  • Gonadotrophins are special hormones that activate the sexual glands. (study.com)
  • Once these sexual glands are activated, they begin to release their own hormones that result in physical changes throughout the body. (study.com)
  • These gonadotropic hormones lead to sexual maturation and gametogenesis . (wikipedia.org)
  • Primary sex characteristics refer to the sexual organs. (study.com)
  • 1) __________ is the period at which maturation of the sexual organs occurs. (weegy.com)
  • For a young girl or boy, this means taking more time and care cleaning one's body, especially the sexual organs, dealing with acne, bad breath, and a stronger body odor, as well as doing more to prevent cavities and gum disease. (encyclopedia.com)
  • Delay in sexual maturation in perinatally HIV-infected youths is mediated by poor growth. (nih.gov)
  • To evaluate the association between HIV infection and sexual maturation, and mediation of this association by HIV effects on growth. (nih.gov)
  • Early sexual maturation has been associated with overweight that may persist after the completion of biological growth and development. (biomedcentral.com)
  • Klein, N. and Griebeler, E. M.: Growth patterns, sexual dimorphism, and maturation modeled in Pachypleurosauria from Middle Triassic of central Europe (Diapsida: Sauropterygia), Foss. (copernicus.org)
  • Endocrine-disrupting chemicals (EDCs) can have adverse impacts on children's physical growth and tempo of maturation and have been related to development of adult chronic conditions, e.g., obesity, type 2 diabetes mellitus and cardiovascular disease. (epa.gov)
  • Research findings will shed light on epigenetic and transcriptional changes leading to changes in growth, maturation and metabolic outcomes, and provide an invaluable base for designing future interventions to reduce the impact of pervasive EDCs on children's health. (epa.gov)
  • The goal of this study was to identify genes that may be involved in sexual maturation in experimentally matured eels. (biomedcentral.com)
  • This study shows that the brains of eels undergo major changes at the molecular level at sexual maturity that may include re-organization at the cellular level. (biomedcentral.com)
  • thus, it is of great value to understand the transcriptional changes involved in sexual maturation and mating processes as well as the related genes. (biomedcentral.com)
  • These findings may be related with some remodeling processes in the accessory glands during sexual maturation, which could be associated with sperm maturation. (upm.es)
  • Sperm counts and the pattern of androgen-dependent production of gel-plugs in semen also differed significantly between treatments during the critical maturation period. (uea.ac.uk)
  • The effects of maturation on the adolescent ECG were explored using sexual maturity rating (SMR) as a marker. (aappublications.org)
  • Whatever you think of when adolescent sexual development comes to mind, chances are you cringe at the memories. (study.com)
  • We studied 49 boys and girls with delayed physical sexual maturation during treatment with sex steroids. (elsevier.com)
  • Overall physical self-esteem was associated with "Going out with someone" and "Flirting with the aim of having sexual relations" in boys. (nih.gov)
  • Physical changes occur so that way a child's body matures into an adult body capable of sexual reproduction to enable fertilization. (majortests.com)
  • Our objective was to determine the influence of sexual maturation and physical activity level on cardiorespiratory fitness of schoolchildren of both sexes aged 9-14 years. (bvsalud.org)
  • The participants completed the Physical Activity Questionnaire for Children (PAQ-C) and a questionnaire on sexual maturation , and performed the shuttle run test. (bvsalud.org)
  • An influence of maturation and physical activity level on cardiorespiratory fitness was observed in schoolchildren of Aracaju city. (bvsalud.org)
  • Multiple linear regression was used to test the association between physical activity and metabolic risk, adjusted primarily for age, sex, sexual maturation, ethnicity, parental smoking, socioeconomic factors, and the Computer Science & Applications unit, as well as for fitness. (diabetesjournals.org)
  • Early sexual maturation, central adiposity and subsequent overweight in late adolescence. (biomedcentral.com)
  • We have prospectively examined the influence of early sexual maturation on subsequent overweight in late adolescence and assessed if this association was modified by central adiposity in early adolescence. (biomedcentral.com)
  • Mediation analyses accounting for height and BMI Z-scores at specific ages were used to estimate direct and indirect effects of HIV infection on age at sexual maturity. (nih.gov)
  • Mean ages at sexual maturity for PHIV girls (n = 1032) were 15.5 years for both female breast and pubic hair and 15.9 and 15.8 years for PHIV boys (n = 1054) for genitalia and pubic hair, respectively. (nih.gov)
  • PHIV youths attain sexual maturity later on average than PHEU youths. (nih.gov)
  • Illustration of mediation analysis of the role of height and BMI Z-scores in explaining the effect of perinatal HIV infection on the age at sexual maturity. (nih.gov)
  • Proportions of the total effect of perinatal HIV infection on the age at sexual maturity mediated by height Z-scores (dark grey) and BMI Z-scores (light grey) ("indirect effect"), according to four indicators of sexual maturity. (nih.gov)
  • Gonadosomatic index, germ cell differentiation, ovarian cycle and first sexual maturity in female Patinopecten yessoensis were studied by histologic and cytologic observations. (bioone.org)
  • Interestingly, while genes involved in immune system function were down-regulated in the brains of mature males, changes in the expression levels of several receptors and channels were observed suggesting that some rewiring is occurring in the brain at sexual maturity. (biomedcentral.com)
  • We found significant agreements, but also some disagreements between physicians' and subjects' Tanner sexual maturity ratings. (elsevier.com)
  • Nevertheless, it is likely that some undesirable changes observed over time in exploited populations (e.g., reduced body size, earlier sexual maturity, reduced antler size, etc.) are due to selection against desirable phenotypes-a process we call "unnatural" selection. (nap.edu)
  • To understand the importance of the hub neuron in the male worm there must be a full understanding of the neurons that innervate this hub and the impact these neurons have on sexual differentiation. (celebrationagainstentropy.com)
  • Similar to other organisms throughout the animal kingdom, the C. elegans worm undergoes sexual differentiation to determine the sex of the new offspring. (celebrationagainstentropy.com)
  • Women with chronic pain or discomfort around the vulva showed improved sexual function with an oral nerve pain medication used to treat pain caused by a previous herpes infection as well as fibromyalgia, according to a Rutgers study. (news-medical.net)
  • Deposition and maturation of eggs of Schistosoma mansoni in vitro: Importance of fatty acids in serum free media. (springer.com)
  • Hormonal disorder in women during sexual maturation (premenstrual tension). (bookinghealth.com)
  • The aim of our study was to investigate the possibility of shortening the sexual maturation using hormonal administration, and measure the blood serum hormone content to distinguish different genders and maturation stages. (elsevier.com)
  • There was no effect of a 20-week-long hormonal treatment (10 mg carp pituitary/bodyweight kg/week) on the sexual maturation. (elsevier.com)
  • To quantify the placebo effect of various pharmacologic modalities including neuromodulators, hormonal agents, and onabotulinum toxin A for female sexual dysfunction. (bioportfolio.com)
  • The activation of the hypothalamo-hypophyseal-gonadal axis starts, under stimulus of gonadotropin, the secretion of sexual steroids (predominantly testosterone in boys and estradiol in girls), which are in charge of morphological changes in the puberal period. (bvsalud.org)
  • Biological age is based on sexual maturation rating. (bartleby.com)
  • In the present study, we investigated whether photoperiodism influences the sexual maturation of female mice via changes in the kisspeptin system. (frontiersin.org)
  • To investigate whether photoperiodism may influence the sexual maturation and the kisspeptin system of female mice, we bred mice expressing the humanized Renilla green fluorescent protein (hrGFP) under the transcriptional control of the Kiss1 gene ( 19 ) and raised them under a short-day (6 h:18 h light/dark cycle) or a 12 h:12 h light/dark cycle. (frontiersin.org)
  • The vertebrate brain plays a critical role in the regulation of sexual maturation and reproduction by integrating environmental information with developmental and endocrine status. (biomedcentral.com)
  • Additionally, we identified multiple DEGs during sexual maturation that are involved in reproduction, and expression pattern analysis revealed that the majority DEGs detected were highly enriched in those linked to the ovaries or fat bodies. (biomedcentral.com)
  • More fundamentally however, we anticipate these studies to provide new insights into the development of parasitism, bilateral symmetry, immune-evasion strategies, sexual reproduction and organogenesis. (aber.ac.uk)
  • STATE OF THE ART The cardiovascular system (both macro- and microcirculation) undergoes extensive maturation throughout fetal, perinatal and pediatric life. (clinicaltrials.gov)
  • The early production of JH was reflected in a more rapid ovarian maturation although the data suggest that sexual maturation in the Azorean population may require a lower JH titer. (gc.ca)
  • The aim of this study was to examine whether the association between the timing of sexual maturation and subsequent fatness (i.e. (biomedcentral.com)
  • Ryan, Alan S. / Timing of Sexual Maturation [9] (multiple letters) . (umn.edu)
  • These sexual glands are the testes in boys and the ovaries in girls. (study.com)
  • This study reports the gene expression and immunolocalization of the low-affinity neurotrophin receptor, p75, in accessory glands (prostate and bulbourethral glands) and epididymis (caput and cauda) of male rabbits during sexual maturation. (upm.es)
  • to evaluate the sexual function of Italian and Brazilian nursing students using the Female Sexual Function Index (FSFI), to estimate the prevalence of sexual dysfunctions and related factors. (bioportfolio.com)
  • These results suggest that a major aspect of male maturation involves developing traits that increase success in sexual competition, whereas female maturation is not limited by investment in traits involved in mate choice or defense against male antagonism. (epfl.ch)
  • Here, we used a high-throughput sequencing method to identify multiple genes potentially involved in sexual maturation and mating in female B. dorsalis . (biomedcentral.com)
  • The results suggested that after pairing, specific miRNAs regulated gene expression to lead to female sexual maturation. (biomedcentral.com)
  • To date, the exact mechanisms by which males influence female maturation are still unknown. (biomedcentral.com)
  • Further observations on the sexual maturation of female schistosomes in single-sex infections. (springer.com)
  • Hypothalamic nitric oxide synthase activity during sexual maturation in female rats. (nel.edu)
  • Effects of gabaergic and serotoninergic systems on hypothalamic content of catecholamines during sexual development in female rats. (nel.edu)
  • Rondina D, Ponzo O, Szwarcfarb B, Carbone S, Scacchi P, Moguilevsky J. Effects of gabaergic and serotoninergic systems on hypothalamic content of catecholamines during sexual development in female rats. (nel.edu)
  • Changes in the sensitivity of gonadotrophin axis to leptin during sexual maturation in female rats. (nel.edu)
  • Ponzo O, Szwarcfarb B, Rondina D, Carbone S, Reynoso R, Scacchi P, Moguilevsky J. Changes in the sensitivity of gonadotrophin axis to leptin during sexual maturation in female rats. (nel.edu)
  • Female Sexual Dysfunction and the Placebo Effect: A Meta-analysis. (bioportfolio.com)
  • In addition, this exercise provides teenagers with an objective way to understand the wide range of normal pubertal development and to follow their own sexual maturation. (aappublications.org)
  • Two 46,XY brothers were found to have a previously undescribed syndrome characterized by severe mental deficiency, proportionate dwarfism, and delayed sexual development. (springer.com)
  • We found that populations maintained for more than 100 generations under a short generation time and polygamous mating system evolved faster posteclosion maturation and faster egg-to-adult development of males, when compared to populations kept under short generations and randomized monogamy that eliminated sexual selection. (epfl.ch)
  • Conversely, the predicted target genes of bantam were related to the embryo development, development of primary sexual characteristics and regulation of transcription. (biomedcentral.com)
  • The resulting ratio for each sex signals to the tra-1 transcription factor to be turned on or off which in turn determines the sexual development of the worm. (celebrationagainstentropy.com)
  • The insightful work published by Dr. Esther Serrano-Saiz and colleagues from Columbia University in the journal Current Biology in 2017 provided significant understanding on the development of sexual dimorphism. (celebrationagainstentropy.com)
  • Both macro- as well as microvasculature undergoes extensive, organ specific maturation. (clinicaltrials.gov)
  • Disturbances in sexual desire and the psychophysiologic changes that characterize the sexual response cycle and cause marked distress and interpersonal difficulty. (bioportfolio.com)
  • In order to verify the influence of sexual maturation on VO2max, students were categorized according to maturation stage (prepubertal, pubertal and postpubertal), sex , and interaction between sex and maturation. (bvsalud.org)
  • Salt-absorptive activity in the intestine may, however, be down-regulated during male maturation. (diva-portal.org)
  • Testosterone is a male sex hormone that plays a role in fertility, sexual function, bone health, and muscle mass. (medicalnewstoday.com)
  • ANOVA was used to compare mean maturation stages and to assess whether sex and maturation affect VO2max. (bvsalud.org)
  • VO2max values were different between the maturation stages in both sexes, and between sexes at the same maturation stage. (bvsalud.org)
  • Klinefelter syndrome is a frequent cause of hypogonadism, but despite hundreds of publications on different aspects of Klinefelter syndrome, only a few studies dealt with sexual dysfunction. (bioportfolio.com)
  • Clinical study and practice data have shown sildenafil improves sexual function in men with erectile dysfunction (ED). However, some men treated with placebo in double-blind, placebo-controlled silde. (bioportfolio.com)
  • Sexual maturation of European eels ( Anguilla anguilla ) occurs during and/or after the approximately 6,000km migration from their freshwater habitats in Europe across the Atlantic to spawning grounds in the Sargasso Sea. (hatcheryinternational.com)
  • Conservation programmes are facing the problem of late maturation which can be reached between 5 and 11 years depending on the species and gender. (elsevier.com)
  • We also consider how harvesting could affect the mating system and thereby modify sexual selection in a way that might affect recruitment. (nap.edu)