Echinodermata: A phylum of the most familiar marine invertebrates. Its class Stelleroidea contains two subclasses, the Asteroidea (the STARFISH or sea stars) and the Ophiuroidea (the brittle stars, also called basket stars and serpent stars). There are 1500 described species of STARFISH found throughout the world. The second class, Echinoidea, contains about 950 species of SEA URCHINS, heart urchins, and sand dollars. A third class, Holothuroidea, comprises about 900 echinoderms known as SEA CUCUMBERS. Echinoderms are used extensively in biological research. (From Barnes, Invertebrate Zoology, 5th ed, pp773-826)Arbacia: A genus of SEA URCHINS in the family Arbaciidae. They have only one spheridium (stalked body) per ambulacral area (contains tube feet); most sea urchins have several spheridia per area.Sea Urchins: Somewhat flattened, globular echinoderms, having thin, brittle shells of calcareous plates. They are useful models for studying FERTILIZATION and EMBRYO DEVELOPMENT.Ovum: A mature haploid female germ cell extruded from the OVARY at OVULATION.Fertilization: The fusion of a spermatozoon (SPERMATOZOA) with an OVUM thus resulting in the formation of a ZYGOTE.Atlantic OceanSpermatozoa: 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.Species Specificity: The restriction of a characteristic behavior, anatomical structure or physical system, such as immune response; metabolic response, or gene or gene variant to the members of one species. It refers to that property which differentiates one species from another but it is also used for phylogenetic levels higher or lower than the species.Microscopy, Electron: Microscopy using an electron beam, instead of light, to visualize the sample, thereby allowing much greater magnification. The interactions of ELECTRONS with specimens are used to provide information about the fine structure of that specimen. In TRANSMISSION ELECTRON MICROSCOPY the reactions of the electrons that are transmitted through the specimen are imaged. In SCANNING ELECTRON MICROSCOPY an electron beam falls at a non-normal angle on the specimen and the image is derived from the reactions occurring above the plane of the specimen.Pteridium: A plant genus of the family DENNSTAEDTIACEAE. Members contain ptaquiloside, braxin A1, and braxin B. The name is similar to brake fern (PTERIS).Ciona intestinalis: The only species of a cosmopolitan ascidian.Steroids: A group of polycyclic compounds closely related biochemically to TERPENES. They include cholesterol, numerous hormones, precursors of certain vitamins, bile acids, alcohols (STEROLS), and certain natural drugs and poisons. Steroids have a common nucleus, a fused, reduced 17-carbon atom ring system, cyclopentanoperhydrophenanthrene. Most steroids also have two methyl groups and an aliphatic side-chain attached to the nucleus. (From Hawley's Condensed Chemical Dictionary, 11th ed)Aesculus: A plant genus of the family HIPPOCASTANACEAE (or SAPINDACEAE by some) that contains antimicrobial protein 1 and escin. A. hippocastanum is used in folk medicine for treating chronic venous insufficiency.Vomeronasal Organ: An accessory chemoreceptor organ that is separated from the main OLFACTORY MUCOSA. It is situated at the base of nasal septum close to the VOMER and NASAL BONES. It forwards chemical signals (such as PHEROMONES) to the CENTRAL NERVOUS SYSTEM, thus influencing reproductive and social behavior. In humans, most of its structures except the vomeronasal duct undergo regression after birth.Steroids, Chlorinated: Steroids which are substituted with one or more chlorine atoms in any position.Sulfates: Inorganic salts of sulfuric acid.Lytechinus: A genus of SEA URCHINS in the family Toxopneustidae possessing trigeminate ambulacral plating.Indian Ocean: A body of water covering approximately one-fifth of the total ocean area of the earth, extending amidst Africa in the west, Australia in the east, Asia in the north, and Antarctica in the south. Including the Red Sea and the Persian Gulf, it constitutes the third largest ocean after the ATLANTIC OCEAN and the PACIFIC OCEAN. (New Encyclopaedia Britannica Micropaedia, 15th ed, 1990, p289)BrazilElectrophoresis, Polyacrylamide Gel: Electrophoresis in which a polyacrylamide gel is used as the diffusion medium.Molecular Weight: The sum of the weight of all the atoms in a molecule.Cross-Linking Reagents: Reagents with two reactive groups, usually at opposite ends of the molecule, that are capable of reacting with and thereby forming bridges between side chains of amino acids in proteins; the locations of naturally reactive areas within proteins can thereby be identified; may also be used for other macromolecules, like glycoproteins, nucleic acids, or other.Amino Acid Sequence: The order of amino acids as they occur in a polypeptide chain. This is referred to as the primary structure of proteins. It is of fundamental importance in determining PROTEIN CONFORMATION.Chromatography, Ion Exchange: Separation technique in which the stationary phase consists of ion exchange resins. The resins contain loosely held small ions that easily exchange places with other small ions of like charge present in solutions washed over the resins.Centrioles: Self-replicating, short, fibrous, rod-shaped organelles. Each centriole is a short cylinder containing nine pairs of peripheral microtubules, arranged so as to form the wall of the cylinder.Centrosome: The cell center, consisting of a pair of CENTRIOLES surrounded by a cloud of amorphous material called the pericentriolar region. During interphase, the centrosome nucleates microtubule outgrowth. The centrosome duplicates and, during mitosis, separates to form the two poles of the mitotic spindle (MITOTIC SPINDLE APPARATUS).Cilia: Populations of thin, motile processes found covering the surface of ciliates (CILIOPHORA) or the free surface of the cells making up ciliated EPITHELIUM. Each cilium arises from a basic granule in the superficial layer of CYTOPLASM. The movement of cilia propels ciliates through the liquid in which they live. The movement of cilia on a ciliated epithelium serves to propel a surface layer of mucus or fluid. (King & Stansfield, A Dictionary of Genetics, 4th ed)Microtubule-Organizing Center: An amorphous region of electron dense material in the cytoplasm from which the MICROTUBULES polymerization is nucleated. The pericentriolar region of the CENTROSOME which surrounds the CENTRIOLES is an example.Zygote: The fertilized OVUM resulting from the fusion of a male and a female gamete.Drosophila melanogaster: A species of fruit fly much used in genetics because of the large size of its chromosomes.Microtubules: Slender, cylindrical filaments found in the cytoskeleton of plant and animal cells. They are composed of the protein TUBULIN and are influenced by TUBULIN MODULATORS.Anaphase-Promoting Complex-Cyclosome: An E3 ubiquitin ligase primarily involved in regulation of the metaphase-to-anaphase transition during MITOSIS through ubiquitination of specific CELL CYCLE PROTEINS. Enzyme activity is tightly regulated through subunits and cofactors, which modulate activation, inhibition, and substrate specificity. The anaphase-promoting complex, or APC-C, is also involved in tissue differentiation in the PLACENTA, CRYSTALLINE LENS, and SKELETAL MUSCLE, and in regulation of postmitotic NEURONAL PLASTICITY and excitability.Schizosaccharomyces: A genus of ascomycetous fungi of the family Schizosaccharomycetaceae, order Schizosaccharomycetales.Ubiquitin-Protein Ligase Complexes: Complexes of enzymes that catalyze the covalent attachment of UBIQUITIN to other proteins by forming a peptide bond between the C-terminal GLYCINE of UBIQUITIN and the alpha-amino groups of LYSINE residues in the protein. The complexes play an important role in mediating the selective-degradation of short-lived and abnormal proteins. The complex of enzymes can be broken down into three components that involve activation of ubiquitin (UBIQUITIN-ACTIVATING ENZYMES), conjugation of ubiquitin to the ligase complex (UBIQUITIN-CONJUGATING ENZYMES), and ligation of ubiquitin to the substrate protein (UBIQUITIN-PROTEIN LIGASES).Schizosaccharomyces pombe Proteins: Proteins obtained from the species Schizosaccharomyces pombe. The function of specific proteins from this organism are the subject of intense scientific interest and have been used to derive basic understanding of the functioning similar proteins in higher eukaryotes.Anaphase: The phase of cell nucleus division following METAPHASE, in which the CHROMATIDS separate and migrate to opposite poles of the spindle.Mitosis: A type of CELL NUCLEUS division by means of which the two daughter nuclei normally receive identical complements of the number of CHROMOSOMES of the somatic cells of the species.Cell Cycle Proteins: Proteins that control the CELL DIVISION CYCLE. This family of proteins includes a wide variety of classes, including CYCLIN-DEPENDENT KINASES, mitogen-activated kinases, CYCLINS, and PHOSPHOPROTEIN PHOSPHATASES as well as their putative substrates such as chromatin-associated proteins, CYTOSKELETAL PROTEINS, and TRANSCRIPTION FACTORS.IllinoisPropiolactone: Disinfectant used in vapor form to sterilize vaccines, grafts, etc. The vapor is very irritating and the liquid form is carcinogenic.Bees: Insect members of the superfamily Apoidea, found almost everywhere, particularly on flowers. About 3500 species occur in North America. They differ from most WASPS in that their young are fed honey and pollen rather than animal food.Agraphia: Loss or impairment of the ability to write (letters, syllables, words, or phrases) due to an injury to a specific cerebral area or occasionally due to emotional factors. This condition rarely occurs in isolation, and often accompanies APHASIA. (From Adams et al., Principles of Neurology, 6th ed, p485; APA, Thesaurus of Psychological Index Terms, 1994)Bowen's Disease: A persistent progressive non-elevated red scaly or crusted plaque which is due to an intradermal carcinoma and is potentially malignant. Atypical squamous cells proliferate through the whole thickness of the epidermis. The lesions may occur anywhere on the skin surface or on mucosal surfaces. The cause most frequently found is trivalent arsenic compounds. Freezing, cauterization or diathermy coagulation is often effective. (From Rook et al., Textbook of Dermatology, 4th ed, pp2428-9)RNA Helicases: A family of proteins that promote unwinding of RNA during splicing and translation.Writing: The act or practice of literary composition, the occupation of writer, or producing or engaging in literary work as a profession.Magnetic Resonance Imaging: Non-invasive method of demonstrating internal anatomy based on the principle that atomic nuclei in a strong magnetic field absorb pulses of radiofrequency energy and emit them as radiowaves which can be reconstructed into computerized images. The concept includes proton spin tomographic techniques.Invertebrates: Animals that have no spinal column.Magnetic Resonance Spectroscopy: Spectroscopic method of measuring the magnetic moment of elementary particles such as atomic nuclei, protons or electrons. It is employed in clinical applications such as NMR Tomography (MAGNETIC RESONANCE IMAGING).X-Ray Microtomography: X-RAY COMPUTERIZED TOMOGRAPHY with resolution in the micrometer range.Imaging, Three-Dimensional: The process of generating three-dimensional images by electronic, photographic, or other methods. For example, three-dimensional images can be generated by assembling multiple tomographic images with the aid of a computer, while photographic 3-D images (HOLOGRAPHY) can be made by exposing film to the interference pattern created when two laser light sources shine on an object.Strongylocentrotus purpuratus: A species of SEA URCHINS in the family Strongylocentrotidae found on the Pacific coastline from Alaska to Mexico. This species serves as a major research model for molecular developmental biology and other fields.

Revisiting the role of H+ in chemotactic signaling of sperm. (1/6)

Chemotaxis of sperm is an important step toward fertilization. During chemotaxis, sperm change their swimming behavior in a gradient of the chemoattractant that is released by the eggs, and finally sperm accumulate near the eggs. A well established model to study chemotaxis is the sea urchin Arbacia punctulata. Resact, the chemoattractant of Arbacia, is a peptide that binds to a receptor guanylyl cyclase. The signaling pathway underlying chemotaxis is still poorly understood. Stimulation of sperm with resact induces a variety of cellular events, including a rise in intracellular pH (pHi) and an influx of Ca2+; the Ca2+ entry is essential for the chemotactic behavior. Previous studies proposed that the influx of Ca2+ is initiated by the rise in pHi. According to this proposal, a cGMP-induced hyperpolarization activates a voltage-dependent Na+/H+ exchanger that expels H+ from the cell. Because some aspects of the proposed signaling pathway are inconsistent with recent results (Kaupp, U.B., J. Solzin, J.E. Brown, A. Helbig, V. Hagen, M. Beyermann, E. Hildebrand, and I. Weyand. 2003. Nat. Cell Biol. 5:109-117), we reexamined the role of protons in chemotaxis of sperm using kinetic measurements of the changes in pHi and intracellular Ca2+ concentration. We show that for physiological concentrations of resact (<25 pM), the influx of Ca2+ precedes the rise in pHi. Moreover, buffering of pHi completely abolishes the resact-induced pHi signal, but leaves the Ca2+ signal and the chemotactic motor response unaffected. We conclude that an elevation of pHi is required neither to open Ca(2+)-permeable channels nor to control the chemotactic behavior. Intracellular release of cGMP from a caged compound does not cause an increase in pHi, indicating that the rise in pHi is induced by cellular events unrelated to cGMP itself, but probably triggered by the consumption and subsequent replenishment of GTP. These results show that the resact-induced rise in pHi is not an obligatory step in sperm chemotactic signaling. A rise in pHi is also not required for peptide-induced Ca2+ entry into sperm of the sea urchin Strongylocentrotus purpuratus. Speract, a peptide of S. purpuratus may act as a chemoattractant as well or may serve functions other than chemotaxis.  (+info)

Ca2+ spikes in the flagellum control chemotactic behavior of sperm. (2/6)

The events that occur during chemotaxis of sperm are only partly known. As an essential step toward determining the underlying mechanism, we have recorded Ca2+ dynamics in swimming sperm of marine invertebrates. Stimulation of the sea urchin Arbacia punctulata by the chemoattractant or by intracellular cGMP evokes Ca2+ spikes in the flagellum. A Ca2+ spike elicits a turn in the trajectory followed by a period of straight swimming ('turn-and-run'). The train of Ca2+ spikes gives rise to repetitive loop-like movements. When sperm swim in a concentration gradient of the attractant, the Ca2+ spikes and the stimulus function are synchronized, suggesting that precise timing of Ca2+ spikes controls navigation. We identified the peptide asterosap as a chemotactic factor of the starfish Asterias amurensis. The Ca2+ spikes and swimming behavior of sperm from starfish and sea urchin are similar, implying that the signaling pathway of chemotaxis has been conserved for almost 500 million years.  (+info)

Assessment of sperm chemokinesis with exposure to jelly coats of sea urchin eggs and resact: a microfluidic experiment and numerical study. (3/6)

Specific peptides contained within the extracellular layer, or jelly coat, of a sea urchin egg have been hypothesized to play an important role in fertilization, though separate accounting of the effects of chemoattraction, chemokinesis, sperm agglomeration and the other possible roles of the jelly coat have not been reported. In the present study, we used a microfluidic device that allowed determination of the differences in the diffusion coefficients of sperm of the purple sea urchin Arbacia punctulata subjected to two chemoattractants, namely the jelly coat and resact. Our objectives were twofold: (1) to experimentally determine and compare the diffusion coefficients of Arbacia punctulata spermatozoa in seawater, jelly coat solution and resact solution; and (2) to determine the effect of sea urchin sperm diffusion coefficient and egg size on the sperm-egg collision frequency using stochastic simulations. Numerical values of the diffusion coefficients obtained by diffusing the spermatozoa in seawater, resact solution and jelly coat solution were used to quantify the chemotactic effect. This allowed direct incorporation of known enlargements of the egg, and altered sperm diffusion coefficients in the presence of chemoattractant, in the stochastic simulations. Simulation results showed that increase in diffusion coefficient values and egg diameter values increased the collision frequency. From the simulation results, we concluded that type of sperm, egg diameter and diffusion coefficient are significant factors in egg fertilization. Increasing the motility of sperm appears to be the prominent role of the jelly coat.  (+info)

Multiple processes regulate long-term population dynamics of sea urchins on Mediterranean rocky reefs. (4/6)

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Natural or naturalized? Phylogeography suggests that the abundant sea urchin Arbacia lixula is a recent colonizer of the Mediterranean. (5/6)

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Direct relationship between osmotic and ionic conforming behavior and tissue water regulatory capacity in echinoids. (6/6)

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The sea urchin Arbacia lixula is a keystone species in Mediterranean ecosystems that drive landscape changes in littoral communities. However, genomic information available for the whole order Arbacioida is very limited. Using RNA-seq techniques, we have characterized the transcriptome of four different tissue types in A. lixula: the somatic tissues (coelomocytes and digestive tissue) and the reproductive tissues (ovary and testis), from two replicated cDNA libraries for each sample. Additionally, we performed a de novo assembly to build the reference transcriptome, pooling reads of the four tissues, to analyse the differential expression (DE) in pairwise comparisons between tissues. The complete de novo assembly yielded 186 084 transcripts, with a sequence size limit of 100 nt, being 31% of them spliced isoforms. Approximately 21% of the transcripts had blast hits against proteins of metazoans (E , 10 5), being less than 2.2% functionally annotated. Between coelomocytes and digestive, 30 ...
Sea urchins can be found throughout the Brazilian coast and are reported to be one of the major causes of marine accidents on the shoreline. Although not lethal, these accidents are reported to be extremely painful. In order to understand the toxinology of the Brazilian urchins, a peptidomic app...
得到博士學位後,亨特返回紐約歐文·倫敦的實驗小組,跟其他成員一同發現小量氧化了的穀胱甘肽(即GSSG)便足以抑制網狀紅血球合成蛋白質的能力,以及雙鏈核糖核酸(雙鏈RNA)完全制止了蛋白質合成。回到劍橋大學後,他與安東尼·亨特和理查德·傑克遜(英語:Richard Jackson (biochemist))一起工作。二人較早前發現了啟動血紅素合成的核糖核酸(RNA),即如今科學界認識的甲硫胺酸-轉運核糖核酸複合體。3至4年後,三人再發現最少兩個能夠抑制血紅素合成的化學物[13]。. 此外,亨特也定期在夏天於麻薩諸塞州海洋生物學實驗室(英語:Marine Biological Laboratory)工作。1982年夏,他在海洋生物學實驗室以其中一種海膽Arbacia punctulata(英語:Arbacia ...
得到博士學位後,亨特返回紐約歐文·倫敦的實驗小組,跟其他成員一同發現小量氧化了的穀胱甘肽(即GSSG)便足以抑制網狀紅血球合成蛋白質的能力,以及雙鏈核糖核酸(雙鏈RNA)完全制止了蛋白質合成。回到劍橋大學後,他與安東尼·亨特和理查德·傑克遜(英語:Richard Jackson (biochemist))一起工作。二人較早前發現了啟動血紅素合成的核糖核酸(RNA),即如今科學界認識的甲硫胺酸-轉運核糖核酸複合體。3至4年後,三人再發現最少兩個能夠抑制血紅素合成的化學物[13]。. 此外,亨特也定期在夏天於麻薩諸塞州海洋生物學實驗室(英語:Marine Biological Laboratory)工作。1982年夏,他在海洋生物學實驗室以其中一種海膽Arbacia punctulata(英語:Arbacia ...
additional source Lessios, H. A., Lockhart, S., Collin, R., Sotil, G., Sanchez-Jerez, P., Zigler, K. S., Perez, A. F., Garrido, M. J., Geyer, L. B., Bernardi, G., Vaquier, V. D., Haroun, R. & Kessing, B. D. 2012. Phylogeography and bindin evolution in Arbacia, a sea urchin genus with an unusual distribution. Molecular Ecology 21, 130-144., available online at https://doi.org/10.1111/j.1365-294x.2011.05303.x [details] ...
Cleavage in embryos of the sea urchin Arbacia punctulata consists of eight very rapid divisions that require continual protein synthesis to sustain them. This synthesis is programmed by stored maternal mRNAs, which code for three or four particularly abundant proteins whose synthesis is barely if at all detectable in the unfertilized egg. One of these proteins is destroyed every time the cells divide. Eggs of the sea urchin Lytechinus pictus and oocytes of the surf clam Spisula solidissima also contain proteins that only start to be made after fertilization and are destroyed at certain points in the cell division cycle. We propose to call these proteins the cyclins. ...
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A large, gregarious mammal, the sea lion ranges along the western coast of North America. In the water, their torpedo-shaped bodies can reach speeds of 25 to 30 miles per hour (40 to 48 kilometer per hour).
This study will treat participants with newly diagnosed, low, intermediate and high risk rhabdomyosarcoma (RMS) using multi-modality risk-adapted therapy
In general as far as I know customers who bought Isle of Dogs Coature No. 91 Royal Jelly Coat Supplement for Dogs with thin or shedding coats, 1 liter or other products in the Internet also were interested in reviews, cheap & lowest prices in outlets and stores, shipping, gift ideas, city deals, sales, coupons online, new, holiday & daily deals, bargain, best buy products including special offers on Isle of Dogs Coature No. 91 Royal Jelly Coat Supplement for Dogs with thin or shedding coats, 1 liter, best deals, discount coupons, top & hot deals, great offers, last minute deals and so on ...
I just moved in to a 5 year old house. The toilet on the first floor has hot water in the tank. When I have guest and the toilet is flushed 4 or 5 times, the water gets very hot and creates lots of steam. I called the builder and said I believe the hot supply is connected to the tank instead of the cold supply. He said that was impossible and refused to come and look at the toilet. Is there any other explanation? Also, the basement is finished so I cannot see the supply pipes leading to the first floor basement.
All pieces are sold with a full description of the fossil and its origins, and comes with a money-back, lifetime guarantee of authenticity ...
All pieces are sold with a full description of the fossil and its origins, and comes with a money-back, lifetime guarantee of authenticity ...
Pulsed proton nuclear magnetic resonance was used to differentiate between normal and malignant tissues. When the tissue water content varied from 80 to 93%, the tumors exhibited spin-lattice relaxation times (T1) from 0.9 to 1.8 sec. We report also the results obtained on 9-day-old embryos and on liver, brain, and heart from 2-day-old rats. A good correlation between the spin-lattice (T1) and spin-spin (T2) relaxation times and the tissue water content was found for all tissues studied. The relaxation times T1 and T2 and water content in Walker 256 carcinoma and its lymph node metastasis were quite similar.
Addisons disease, also known as hypoadrenocorticism, is a disease in dogs in which the adrenal glands outer layer, the cortex, is destroyed. Read about signs of Addisons disease, the cost of treatment, and how it can be prevented from Embrace Pet Insurance.
Chemokinesis is chemically prompted kinesis, a motile response of unicellular prokaryotic or eukaryotic organisms to chemicals that cause the cell to make some kind of change in their migratory/swimming behaviour. Changes involve an increase or decrease of speed, alterations of amplitude or frequency of motile character, or direction of migration. However, in contrast to chemotaxis, chemokinesis has a random, non-vectorial moiety, in general. Due to the random character, techniques dedicated to evaluate chemokinesis are partly different from methods used in chemotaxis research. One of the most valuable ways to measure chemokinesis is computer-assisted (see, e.g., Image J) checker-board analysis, which provides data about migration of identical cells, whereas, in Protozoa (e.g., Tetrahymena), techniques based on measurement of opalescence were also developed. Becker EL (1977). "Stimulated neutrophil locomotion: chemokinesis and chemotaxis". Arch Pathol Lab Med. 101 (10): 509-13. PMID 199132. ...
Chemokinesis definition: the random movement of cells, such as leucocytes , stimulated by substances in their... | Meaning, pronunciation, translations and examples
This is the official approximate match mapping between ICD9 and ICD10, as provided by the General Equivalency mapping crosswalk. This means that while there is no exact mapping between this ICD10 code I09.89 and a single ICD9 code, 398.99 is an approximate match for comparison and conversion purposes. ...
Existence and degree of somatic mutation of expressed Ig V genes stratify CLL cases into unmutated (U-CLL) and mutated (M-CLL), clinically distinct subgroups. CLL cells likely receive survival cues via interactions through their BCR, TLR, and cytokine/chemokine receptors. We reported ex vivo expression of CCR4 and its induction on CLL cells stimulated in vitro. In assays of chemotactic behavior in response to CCL17, migrated cells showed significantly higher percentages and densities of CD38 expression than the non-migrated cells suggesting a role for CD38 (a known marker of CLL prognosis) in the CCR4-mediated downstream pathway. Dendritic cell-derived CCL17 may exert an accessory role in BCR- and TLR-9-mediated immune responses in B cells in peripheral organs. CCL17 augmented BCR-mediated B-cell proliferation in 9/16 (56%) U-CLL cases, and in 3/15 (20%) M-CLL cases, and promoted TLR-9-mediated cell proliferation in 13/15(87%) M-CLL cases and 6/16 U-CLL cases. In addition, CCL17 promoted cell ...
... anatomy based on Arbacia sp.. Urchins typically range in size from 3 to 10 cm (1 to 4 in), although the largest ...
Sea urchins such as Arbacia punctulata are ideal organisms to use in sperm research, they spawn large numbers of sperm into the ...
此外,亨特也定期在夏天於麻薩諸塞州海洋生物學實驗室(英語:Marine Biological Laboratory)工作。1982年夏,
Hinrichs, M. A. (1926). The Effect of Ultraviolet Radiation on the Fertilizing Power of Arbacia Sperm. Biological Bulletin,50(6 ...
128372 Danielwibben 128373 Kevinjohnson 128389 Dougleland 128408 Mikehughes 128417 Chrismccaa 128439 Chriswaters 128474 Arbacia ...
Ghost shrimp Sand dollar Arbacia punctulata = Delcore's Sea Urchin Strongylocentrotus droebachiensis = Common Green Sea Urchin ...
Araeosoma tessellatum Araeosoma thetidis Arbacia crassispina Kroh, A. (2010). Araeosoma violaceum (Ole Theodor Jensen Mortensen ...
Determining its brief existence, volumetric changes, and vital role in cleaving Arbacia eggs". J. Cell Biol. 53 (2): 419-34. ...
Arbacia †Arbacina †Arbia (genus) †Archaechinus †Archaeocalyptocrinus †Archaeocidaris †Archaeocothurnus †Archaeocrinus † ...
L. V. Heilbrunn & R. A. Young (1930). "The action of ultra-violet rays on Arbacia egg protoplasm". Physiological Zoology. 3 (3 ...
Strongylocentrotus purpuratus and Arbacia punctulata are used for this purpose in embryological studies. The large size and the ... Longo, F. J.; Anderson, E. (June 1969). "Sperm differentiation in the sea urchins Arbacia punctulata and Strongylocentrotus ...
An example of gametic isolation involves the allopatric sea urchins (Arbacia) have minimal bindin differences (bindin is a ... "Mitochondrial DNA and Bindin Gene Sequence Evolution Among Allopatric Species of the Sea Urchin Genus Arbacia", Molecular ...
Arbacia crassispina Arbacia lixula Arbacia stellata Kroh, A. (2010). Arbacia lixula (Valenciennes, 1846). In: Kroh, A. & Mooi, ... Arbacia spatuligera is a species of sea urchin of the family Arbaciidae. Its armour is covered with spines. A. lixula was first ...
... a demosponge from the phylum Porifera used as a model for evolutionary developmental biology and comparative genomics Arbacia ...
"Encyclopedia Of Life (EOL) ''Arbacia punctulata''". EOL. 2011-10-14. Retrieved 2013-10-18. "World Register of Marine Species ( ... WoRMS) ''Arbacia punctulata'' (Lamarck, 1816) AphiaID: 158058". Marinespecies.org. Retrieved 2013-10-18. "World Register of ...
Ward, G.E., Brokaw, C.J., Garbers, D.L. and Vacquier, V.D. (1985) Chemotaxis of Arbacia punctulata spermatozoa to resact, a ... The current knowledge is mainly based on studies in the sea urchin Arbacia punctulata, where binding of the chemoattractant ... A model of the signal-transduction pathway during sperm chemotaxis of the sea urchin Arbacia punctulata. Binding of a ...
... may refer to: Aethalura punctulata, the grey birch, a moth species found in Europe Arbacia punctulata, a sea ...
Figure 1. A model of the signal-transduction pathway during sperm chemotaxis of the sea urchin Arbacia punctulata. Binding of a ... The current knowledge is mainly based on studies in the sea urchin Arbacia punctulata, where binding of the chemoattractant ...
Arbacia stellata Arbaciella elegans Argopatagus vitreus Kroh, A. (2010). Argopatagus planus (A. Agassiz & H.L. Clark, 1907). In ...
Arbacia spatuligera Arbacia stellata Argopatagus planus Kroh, A. (2010). Arbaciella elegans (Ole Theodor Jensen Mortensen, 1910 ... It is placed in the genus Arbacia and lives in the sea. Arbaciella elegans was first scientifically described in 1910 by Ole ...
Araeosoma thetidis Araeosoma violaceum Arbacia dufresnii Kroh, A. (2010). Arbacia crassispina (Ole Theodor Jensen Mortensen, ... Arbacia crassispina is a species of sea urchin of the family Arbaciidae. Its armour is covered with spines. A. crassispina was ...
Allocentrotus fragilis Arbacia lixula Cidaris cidaris Echinus esculentus Paracentrotus lividus Psammechinus miliaris ...
Arbacia spatuligera ZIEMSKI Frédéric, ANDRÉ Frédéric, in : DORIS, 15/5/2014 : Arbacia lixula (Linnaeus, 1758). Uthicke, Sven; ... The black sea urchin, Arbacia lixula is a species of sea urchin from Europe. It is a medium-sized sea urchin, characterized by ...
... is also a model organism of marine sediments toxicity and sperm study. Serafy, D. K., 1979: Echinoids ( ... Lillie FR (March 1915). "The Fertilizing Power of Sperm Dilutions of Arbacia". Proc. Natl. Acad. Sci. U.S.A. 1 (3): 156-60. doi ... The Atlantic purple sea urchin (Arbacia punctulata) is a species of sea urchins from the family Arbaciidae, native to the ... Sharp, D. T.; Gray, I. E. (1962). "Studies on factors affecting the local distribution of two sea urchins, Arbacia punctulata ...
It contains these genera: Arbacia Gray, 1835 Arbaciella Mortensen, 1910a Arbia Cooke, 1948† Baueria Noetling, 1885† Codiopsis ...
It was there at Woods Hole in the Summer of 1982 using the sea urchin (Arbacia punctulata) egg as his model organism, he ...
From 1910 to 1921 Lillies research centered on fertilization in the annelid Nereis limbata and sea urchins Arbacia punctulata ...
emporal variability in abundance of the sea urchins Paracentrotus lividus and Arbacia lixula in the northwestern Mediterranean ...
Genus Arbacia * Species Arbacia lixula * Order Temnopleuroida * Family Toxopneustidae * Genus Lytechinus * Species Lytechinus ...
... the sea urchin Arbacia punctulata (9), the coral Montipora digitata (10), and Xenopus laevis, have been identified (11). ...
The complete nucleotide sequence (15,719 nucleotides) of the mitochondrial DNA (mtDNA) from the sea urchin Arbacia lixula is ...
Arbacia Arbacia Arbacia Asterias Asterias Asterias Asterina Asterina Asterina Axinella Axinella Axinella ...
No metallothionein was found either in the eggs of Arbacia lixula, or in those of the three Eastern species Strongylocentrotus ...
Project Title: The Effect of Water Temperature on the Reproduction and Growth of the Arbacia punctulata ...
Characterization of 5.8-S RNA from a complex with 26-S ribosomal RNA from Arbacia punctulata. Reply to Calow: In defense of ...
Genus Arbacia * Species Arbacia lixula * Order Temnopleuroida * Family Toxopneustidae * Genus Lytechinus * Species Lytechinus ...
... including Arbacia punctulata, which does not respond to speract. ...
Sperm of the sea urchin Arbacia punctulata can respond to a single molecule of chemoattractant released by an egg. The ...
1968 The fine structure of pronuclear development and fusion in the sea urchin, Arbacia punctulata. J. Cell Biol. 39: 339-368. ...
We thank Tim Hunt for the Xenopus cyclin B2 clone, Michael Glotzer for the Arbacia cyclin Δ90 clone, Philip Hieter for the anti ...
Atman Balakrishnan of Hinsdale, Illinois, whose father won the 1985 Scripps National Spelling Bee, spells pince-nez correctly in Round 2. (Mark Bowen/Scripps National Spelling Bee) ...
Arbacia punctulata (Lamarck, 1816) [55], Paracentrotus lividus (Lamarck, 1816) [56, 57], Echinus esculentus Linnaeus, 1758 [58 ...
An experimental study of clot formation in the perivisceral fluid of Arbacia. Physiol. Zool. ... An experimental study of clot formation in the perivisceral fluid of Arbacia. Physiol. Zool. ...
acute toxicityArbacia punctulatacosmeticsenvironmental toxicitylarval developmentlarval morphologyparabenspluteus larvae ... Abundance algae Arbacia puntulata Atlantic brown shrimp Atlantic Silversides bacteria benthic microalgae biogeochemistry ...
The Azorean barnacle (Megabalanus azoricus), black sea urchin (Arbacia lixula), stony sea urchin (Paracentrotus lividus), ...
dbpedia-fr:Arbacia_punctulata. *dbpedia-fr:Élément_PYLIS. *dbpedia-fr:Élément_SECIS ...
Underwater high frequency noise: Biological responses in sea urchin Arbacia lixula (Linnaeus, 1758). Vazzana, M., Arizza, V., ...
In Arbacia eggs antimitotic action of heavy water is manifested almost immediately at all stages of the mitotic cycle and ... It was described that deuterium parthenogenesis in Arbacia in the following graphic terms: if an unfertilized egg is placed in ...
Ontogenetic changes in larval swimming and orientation of pre-competent sea urchin Arbacia punctulata in turbulence. J Exp Biol ...
Chemotaxis of Arbacia punctulata spermatozoa to resact, a peptide from the egg jelly layer.. GE Ward, CJ Brokaw, DL Garbers, VD ...