Characeae: Family of slender threadlike aquatic plants, in the order CHARALES, phylum STREPTOPHYTA, that are closely related to LAND PLANTS.Chara: A genus of green plants in the family CHARACEAE, phylum STREPTOPHYTA. They have a strong garlic-like odor and are an important food source for waterfowl.Cytoplasmic Streaming: The movement of CYTOPLASM within a CELL. It serves as an internal transport system for moving essential substances throughout the cell, and in single-celled organisms, such as the AMOEBA, it is responsible for the movement (CELL MOVEMENT) of the entire cell.MuseumsPortal Vein: A short thick vein formed by union of the superior mesenteric vein and the splenic vein.Natural History: A former branch of knowledge embracing the study, description, and classification of natural objects (as animals, plants, and minerals) and thus including the modern sciences of zoology, botany, and mineralogy insofar as they existed at that time. In the 17th, 18th, and 19th centuries it was much used for the generalized pursuit of certain areas of science. (Webster, 3d ed; from Dr. James H. Cassedy, NLM History of Medicine Division)Hypertension, Portal: Abnormal increase of resistance to blood flow within the hepatic PORTAL SYSTEM, frequently seen in LIVER CIRRHOSIS and conditions with obstruction of the PORTAL VEIN.Portal System: A system of vessels in which blood, after passing through one capillary bed, is conveyed through a second set of capillaries before it returns to the systemic circulation. It pertains especially to the hepatic portal system.Saint Vincent and the Grenadines: A self-governing state of the Windward Islands in the West Indies, comprising Saint Vincent and the northern islets of the Grenadines. Its capital is Kingstown. It is one of the original homes of the Carib Indians supposed to have been sighted by Columbus in 1498. It was in English hands from 1627 till held by the French 1779-83. Saint Vincent subsequently became a British possession and, with other nearby British territories, was administered by the Governor of the Windward Islands till 1959. It attained a measure of independence in 1969 but achieved full independence as Saint Vincent and the Grenadines in 1979. Saint Vincent was the 4th century Spanish martyr on whose feast day Columbus discovered the island. Grenadines is derived from the Spanish kingdom of Granada. (From Webster's New Geographical Dictionary, 1988, p1054 & The Europa World Year Book 1993, p2441)Teratology: A branch of embryology for the study of congenital malformations and developmental abnormalities.Russia (Pre-1917)Pierre Robin Syndrome: Congenital malformation characterized by MICROGNATHIA or RETROGNATHIA; GLOSSOPTOSIS and CLEFT PALATE. The mandibular abnormalities often result in difficulties in sucking and swallowing. The syndrome may be isolated or associated with other syndromes (e.g., ANDERSEN SYNDROME; CAMPOMELIC DYSPLASIA). Developmental mis-expression of SOX9 TRANSCRIPTION FACTOR gene on chromosome 17q and its surrounding region is associated with the syndrome.Alice in Wonderland Syndrome: Neurological condition characterized by disturbances in VISUAL PERCEPTION, most often of BODY SCHEMA, TIME PERCEPTION and HALLUCINATIONS. It is associated with MIGRAINE, infections (e.g., INFECTIOUS MONONUCLEOSIS), FEVER, EPILEPSY, and other neurological and psychiatric disorders.HistoryBrain Stem Infarctions: Infarctions that occur in the BRAIN STEM which is comprised of the MIDBRAIN; PONS; and MEDULLA OBLONGATA. There are several named syndromes characterized by their distinctive clinical manifestations and specific sites of ischemic injury.Brachiaria: A plant genus of the family POACEAE originating from the savanna of eastern Africa. It is widely grown for livestock forage.Hemiptera: A large order of insects characterized by having the mouth parts adapted to piercing or sucking. It is comprised of four suborders: HETEROPTERA, Auchenorrhyncha, Sternorrhyncha, and Coleorrhyncha.Dictionaries, MedicalDictionaries as Topic: Lists of words, usually in alphabetical order, giving information about form, pronunciation, etymology, grammar, and meaning.Arthropods: Members of the phylum Arthropoda, composed of organisms having a hard, jointed exoskeleton and paired jointed legs. It includes the class INSECTS and the subclass ARACHNIDA, many species of which are important medically as parasites or as vectors of organisms capable of causing disease in man.Dictionaries, ChemicalAphids: A family (Aphididae) of small insects, in the suborder Sternorrhyncha, that suck the juices of plants. Important genera include Schizaphis and Myzus. The latter is known to carry more than 100 virus diseases between plants.Developmental Biology: The field of biology which deals with the process of the growth and differentiation of an organism.Botany: The study of the origin, structure, development, growth, function, genetics, and reproduction of plants.History, 20th Century: Time period from 1901 through 2000 of the common era.SvalbardBiological Evolution: The process of cumulative change over successive generations through which organisms acquire their distinguishing morphological and physiological characteristics.History, 19th Century: Time period from 1801 through 1900 of the common era.Genetics: The branch of science concerned with the means and consequences of transmission and generation of the components of biological inheritance. (Stedman, 26th ed)Neurilemmoma: A neoplasm that arises from SCHWANN CELLS of the cranial, peripheral, and autonomic nerves. Clinically, these tumors may present as a cranial neuropathy, abdominal or soft tissue mass, intracranial lesion, or with spinal cord compression. Histologically, these tumors are encapsulated, highly vascular, and composed of a homogenous pattern of biphasic fusiform-shaped cells that may have a palisaded appearance. (From DeVita Jr et al., Cancer: Principles and Practice of Oncology, 5th ed, pp964-5)Peripheral Nervous System Neoplasms: Neoplasms which arise from peripheral nerve tissue. This includes NEUROFIBROMAS; SCHWANNOMAS; GRANULAR CELL TUMORS; and malignant peripheral NERVE SHEATH NEOPLASMS. (From DeVita Jr et al., Cancer: Principles and Practice of Oncology, 5th ed, pp1750-1)Tourette Syndrome: A neuropsychological disorder related to alterations in DOPAMINE metabolism and neurotransmission involving frontal-subcortical neuronal circuits. Both multiple motor and one or more vocal tics need to be present with TICS occurring many times a day, nearly daily, over a period of more than one year. The onset is before age 18 and the disturbance is not due to direct physiological effects of a substance or a another medical condition. The disturbance causes marked distress or significant impairment in social, occupational, or other important areas of functioning. (From DSM-IV, 1994; Neurol Clin 1997 May;15(2):357-79)Esophageal Sphincter, Lower: The physiologic or functional barrier to GASTROESOPHAGEAL REFLUX at the esophagogastric junction. Sphincteric muscles remain tonically contracted during the resting state and form the high-pressure zone separating the lumen of the ESOPHAGUS from that of the STOMACH. (Haubrich et al, Bockus Gastroenterology, 5th ed., pp399, 415)Hysteria: Historical term for a chronic, but fluctuating, disorder beginning in early life and characterized by recurrent and multiple somatic complaints not apparently due to physical illness. This diagnosis is not used in contemporary practice.Compulsive Behavior: The behavior of performing an act persistently and repetitively without it leading to reward or pleasure. The act is usually a small, circumscribed behavior, almost ritualistic, yet not pathologically disturbing. Examples of compulsive behavior include twirling of hair, checking something constantly, not wanting pennies in change, straightening tilted pictures, etc.France: A country in western Europe bordered by the Atlantic Ocean, the English Channel, the Mediterranean Sea, and the countries of Belgium, Germany, Italy, Spain, Switzerland, the principalities of Andorra and Monaco, and by the duchy of Luxembourg. Its capital is Paris.Copyright: It is a form of protection provided by law. In the United States this protection is granted to authors of original works of authorship, including literary, dramatic, musical, artistic, and certain other intellectual works. This protection is available to both published and unpublished works. (from Circular of the United States Copyright Office, 6/30/2008)Software: Sequential operating programs and data which instruct the functioning of a digital computer.User-Computer Interface: The portion of an interactive computer program that issues messages to and receives commands from a user.Algorithms: A procedure consisting of a sequence of algebraic formulas and/or logical steps to calculate or determine a given task.Access to Information: Individual's rights to obtain and use information collected or generated by others.Membrane Potentials: The voltage differences across a membrane. For cellular membranes they are computed by subtracting the voltage measured outside the membrane from the voltage measured inside the membrane. They result from differences of inside versus outside concentration of potassium, sodium, chloride, and other ions across cells' or ORGANELLES membranes. For excitable cells, the resting membrane potentials range between -30 and -100 millivolts. Physical, chemical, or electrical stimuli can make a membrane potential more negative (hyperpolarization), or less negative (depolarization).TextilesTextile Industry: The aggregate business enterprise of manufacturing textiles. (From Random House Unabridged Dictionary, 2d ed)Flowers: The reproductive organs of plants.Terminology as Topic: The terms, expressions, designations, or symbols used in a particular science, discipline, or specialized subject area.Encyclopedias as Topic: Works containing information articles on subjects in every field of knowledge, usually arranged in alphabetical order, or a similar work limited to a special field or subject. (From The ALA Glossary of Library and Information Science, 1983)MedlinePlus: NATIONAL LIBRARY OF MEDICINE service for health professionals and consumers. It links extensive information from the National Institutes of Health and other reviewed sources of information on specific diseases and conditions.PortugalInternet: A loose confederation of computer communication networks around the world. The networks that make up the Internet are connected through several backbone networks. The Internet grew out of the US Government ARPAnet project and was designed to facilitate information exchange.Consumer Health Information: Information intended for potential users of medical and healthcare services. There is an emphasis on self-care and preventive approaches as well as information for community-wide dissemination and use.Social Media: Platforms that provide the ability and tools to create and publish information accessed via the INTERNET. Generally these platforms have three characteristics with content user generated, high degree of interaction between creator and viewer, and easily integrated with other sites.Dissent and Disputes: Differences of opinion or disagreements that may arise, for example, between health professionals and patients or their families, or against a political regime.

Characterization of MADS-box genes in charophycean green algae and its implication for the evolution of MADS-box genes. (1/5)

The MADS-box genes of land plants are extensively diverged to form a superfamily and are important in various aspects of development including the specification of floral organs as homeotic selector genes. The closest relatives of land plants are the freshwater green algae charophyceans. To study the origin and evolution of land plant MADS-box genes, we characterized these genes in three charophycean green algae: the stonewort Chara globularis, the coleochaete Coleochaete scutata, and the desmid Closterium peracerosum-strigosum-littorale complex. Phylogenetic analyses suggested that MADS-box genes diverged extensively in the land plant lineage after the separation of charophyceans from land plants. The stonewort C. globularis mRNA was specifically detected in the oogonium and antheridium together with the egg and spermatozoid during their differentiation. The expression of the C. peracerosum-strigosum-littorale-complex gene increased when vegetative cells began to differentiate into gametangial cells and decreased after fertilization. These expression patterns suggest that the precursors of land plant MADS-box genes originally functioned in haploid reproductive cell differentiation and that the haploid MADS-box genes were recruited into a diploid generation during the evolution of land plants.  (+info)

The GapA/B gene duplication marks the origin of Streptophyta (charophytes and land plants). (2/5)

Independent evidence from morphological, ultrastructural, biochemical, and molecular data have shown that land plants originated from charophycean green algae. However, the branching order within charophytes is still unresolved, and contradictory phylogenies about, for example,the position of the unicellular green alga Mesostigma viride are difficult to reconcile. A comparison of nuclear-encoded Calvin cycle glyceraldehyde-3-phosphate dehydrogenases (GAPDH) indicates that a crucial duplication of the GapA gene occurred early in land plant evolution. The duplicate called GapB acquired a characteristic carboxy-terminal extension (CTE) from the general regulator of the Calvin cycle CP12. This CTE is responsible for thioredoxin-dependent light/dark regulation. In this work, we established GapA, GapB, and CP12 sequences from bryophytes, all orders of charophyte as well as chlorophyte green algae, and the glaucophyte Cyanophora paradoxa. Comprehensive phylogenetic analyses of all available plastid GAPDH sequences suggest that glaucophytes and green plants are sister lineages and support a positioning of Mesostigma basal to all charophycean algae. The exclusive presence of GapB in terrestrial plants, charophytes, and Mesostigma dates the GapA/B gene duplication to the common ancestor of Streptophyta. The conspicuously high degree of GapB sequence conservation suggests an important metabolic role of the newly gained regulatory function. Because the GapB-mediated protein aggregation most likely ensures the complete blockage of the Calvin cycle at night, we propose that this mechanism is also crucial for efficient starch mobilization. This innovation may be one prerequisite for the development of storage tissues in land plants.  (+info)

Caterpillar regurgitant induces pore formation in plant membranes. (3/5)

Formation of channel-like pores in a plant membrane was induced within seconds after application of an aqueous solution containing regurgitant of the insect larvae Spodoptera littoralis. Gated pore currents recorded on the tonoplast of the Charophyte Chara corallina displayed conductances up to several hundred pS. A voltage-dependent gating reaction supports the assumption that pore-forming molecules have amphipathic properties. Regurgitant samples separated into masses smaller or larger than 3kDa were evaluated by patch-clamp and mass spectroscopy. Fractions containing peptides larger than 3kDa constituted pores of large conductances, peptides smaller than 3kDa constituted pores of small conductances. Peptide-free eluates did not constitute conducting pores, indicating that pore-forming components in regurgitant are membrane-spanning oligopeptides.  (+info)

Microfossils in micrites from Serra da Bodoquena (MS), Brazil: taxonomy and paleoenvironmental implications. (4/5)

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Exogenous melatonin affects photosynthesis in characeae Chara australis. (5/5)

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The reservoir is located in the cerrado (savannah) ecosystem, which in all occupies some two million km2 of Brazils territory. The Brazilian cerrado is occupied by an extensive plateau, between 300 and 600m high, extending into the States of Amazonas, Rondônia, Pará, Maranhão, Piauí, Tocantins, Goiás, Mato Grosso, Mato Grosso do Sul, Bahia, Minas Gerais, and São Paulo and the Federal District.. This region features abundant metamorphic rock from the lower Proterozoic period and major natural deposits of asbestos in the municipality of Minaçu and nickel in the municipalities of Niquelândia and Barro Alto. Small granite outcroppings in the shape of residual peaks are occasionally observed. The Serra da Mesa Dam was built on the Goiano plateau consisting of a dome called the Granito Serra da Mesa and circled by deformed metamorphic rocks (e.g., paragneiss, quartzite, and micaschist).. The regions vegetation, influenced by the Serra da Mesa Reservoir, consists of sparse and relatively ...
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In: Membrane transport in plants / ed. by Michael R. Blatt.- Oxford [u.a.] : Blackwell [u.a.], 2004.- XX, 372 S.- (Annual plant reviews ; 15).- ISBN 1-405-11803-2.- S. 279-293 ...
One of the most important phases of plant evolution occurred approximately 460-480 million years ago when photosynthetic organisms developed the capacity to colonize land. This transition to harsh terrestrial conditions would have required the ability to resist new abiotic stresses, including desiccation and UV radiation, as well as the development of mechanisms to promote progeny dispersal. It is likely that polysaccharide and cuticular cell walls were essential for the transition to a terrestrial environment and yet the evolutionary origins of their biosynthesis are not well understood. In collaboration with Dr. William Willats (University of Copenhagen), Dr. David Domozych (Skidmore College). Dr. Jeffrey Doyle and Dr. Iben Sørensen (Cornell University), we are addressing the hypothesis that the origins of plant cell walls occurred during divergence within the Charophycean green algae (CGA), which represent the closest living relatives to land plants (embryophytes). Characterization of the ...
Augmented population headcounts at these sites coinciding with the timeframe when, down south, was the arriving of the Shulaveri and Berbers (imo), means most likely one thing: Run north from the incoming intimidating others and local populations had no option but to move northbound around the Serra da Estrela mountain range, keep running until you bump into the other huge Iberia River. The Douro River. There, where you cant cross is the Coa Valley where humans between 3500 BC and 2000 BC cluster (again *533). Works done in the last 50 years in the area clearly show this spurs of population increase at times. Whatever words one uses to characterize the events that englobes and defines Chalcolithic Portugal it cannot be applied there, even later periods of bell beaker, social complexity and so forth. Is not there. Ever. They were left to be, serenely has they were, because the bell beakers moved southbound the Serra da Estrela Mountain range, being that the reason why Madrid is south of Cuenca ...
Lab assignment in which students examine different types of microfossils and pick condont elements and foraminifera from sediments and then photograph their specimens using the SEM
Went to South Padre Island today, and this time, I wasnt there digging up the beach. Instead, I was there for a networking lunch at a little conference my buddy Mike (King Midas) Persans was hosting on plant membranes. While I had nothing to do with plant membranes, they had one of the program directors from the ...
Smith, J.R., 1985: The electrical properties of plant cell membranes iii. the effects of insulated regions upon the cable properties and measured membrane conductance of charophytes
This teaching and learning web-site is intended as an introduction to micropalaeontology. Micropalaeontology is the study of microfossils (any fossil generally less than 1mm in size). This page covers calcareous nannofossils.
Hybridoma technology has been used successfully to generate monoclonal-antibody probes against protoplast membrane antigens. Hybridomas secreting monoclonal antibodies that either inhibit or stimulate a putative plasma-membrane marker enzyme, (K+ + Mg2+)-stimulated pH 6.5 ATPase, have been identified and cloned. The specificity of monoclonal-antibody probes on the activity of other phosphate-hydrolysing enzymes has also been examined. The production and identification of monospecific antibodies capable of immunoreacting with particular component proteins in a complex plant membrane mixture highlight the usefulness of hybridoma methodology for the enzymologist, especially since such monoclonal antibodies can be used in the purification of proteins by immunoaffinity techniques. ...
Abstract: O presente trabalho teve por objetivo estudar a biologia e distribui o de Imparfinis minutus na microbacia do Ribeir o Grande (22o47′08′′S, 45o28′17′′W), serra da Mantiqueira oriental, nos períodos de julho e outubro de 2001 e janeiro e abril de 2002. Dentre as 37 espécies amostradas, I. minutus (Siluriformes, Heptapteridae) distribuiu-se desde o pediplano, até a planície do Vale do Paraíba, e esteve associada a ambientes pouco profundos, com substrato constituído principalmente por pedra, cascalho e matac o. O comprimento total dos indivíduos na popula o variou de 4,75 a 12,75 cm. A curva ajustada da rela o peso-comprimento para a popula o foi p = 0,0052 C3,13. Os fatores de condi o alométrico (Ka) e relativo (Kr) apresentaram tendências semelhantes, mostrandose baixos em julho, atingindo valores mais altos em abril. Com respeito à rela ogonadossomática (RGS) de fêmeas, os valores foram mais elevados em outubro e janeiro, o que sugere que a atividade ...
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Conservation groups in Portugal have set up education programmes to try and reverse traditional intolerance to wolves among agricultural communities, and are working to increase the use of livestock guarding dogs - there are two traditional Portuguese breeds, the Castro Labroreiro and the Serra da Estrela - to protect flocks from wolves ...
Recent lines of evidence, including 40Ar/39Ar ages (Kowallis et al., 1998), magnetostratigraphy (Steiner, 1998), spores and pollen (Litwin et al., 1998), and charophytes and ostracods (Schudack et al, 1998), agree the Morrison Formation is predominantly of Kimmeridgian age, although the lowermost units may be latest Oxfordian and the uppermost earliest Tithonian. [Multiple sources for different data in the same sentence ...
books.google.comhttps://books.google.com/books/about/Aspects_of_Palynology.html?id=Kr6zAAAAIAAJ&utm_source=gb-gplus-shareAspects of Palynology ...
Lepidocaris rhyniensis is an extinct species of crustacean. It is the only species known from the order Lipostraca, and is the only abundant animal in the Rhynie chert deposits. It resembles modern Anostraca, to which it is probably closely related, although its relationships to other orders remain unclear. The body is 3 mm (0.12 in) long, with 23 body segments and 19 pairs of appendages, but no carapace. It occurred chiefly among charophytes, probably in alkaline temporary pools. All the known specimens of Lepidocaris rhyniensis have been excavated from the Rhynie chert deposits in Aberdeenshire, Scotland, which is a famous Lagerstätte, or site of exceptional preservation. Lepidocaris is the only abundant animal in the deposits, and is likely to be responsible for many of the frequent coprolites found in the rocks. Lepidocaris was first described by D. J. Scourfield in a 1926 paper in the Philosophical Transactions of the Royal Society B. Scourfield could not accommodate his new genus in the ...
Oncotarget. 2017 Nov 21;8(59):100582-100592 Authors: Zhu C, Xu Y, Duan Y, Li W, Zhang L, Huang Y, Zhao W, Wang Y, Li J, Feng T, Li X, Hu X, Yin W ...
The fossilized dinoflagellate cysts that are found in rock deep beneath the Earths surface only measure about the size of a tiny pencil dot, but they tell paleontologist Lucy Edwards a lot about our groundwater.. Edwards, an AAAS fellow who works for the U.S. Geological Survey (USGS) in Reston, Va., has studied the microfossil algae cysts-the empty shells left over from one life cycle stage of the dinoflagellate-since working on her Ph.D. thesis in the mid-1970s.. "Most paleontologists study the organism for a reason. The reason for me had always been biostatigraphy-using fossils to tell the age of the rock, and using the age of the rock to make predictions about the history of the rock to help find oil, water, or salt," Edwards says.. Working as a paleontologist for USGS means constantly uncovering secrets under the Earths surface. "You can never get bored here and you can never run out of material," she says.. Thats why shes been at her job for more than three decades. "I tell people Im ...
Analyses of morphological and ultrastructural characters, and also of the information carried by gene sequences have established that green algae belonging to the class Charophyceae gave rise to the more than 500,000 land plant species currently inhabiting our planet [1, 2]. Charophycean green algae and land plants form the green plant lineage Streptophyta [3], whereas most, if not all, of the other extant green algae belong to the sister lineage Chlorophyta [2]. In contrast to the large diversity of land plants, only a few thousands charophycean species are living today. Six monophyletic groups are currently recognized in the Charophyceae: the Mesostigmatales [4] represented by Mesostigma viride, a scaly biflagellate that has long been thought to be a member of the Prasinophyceae (the earliest-diverging lineage of the Chlorophyta) [5]; the Chlorokybales represented as well by a single species (Chlorokybus atmophyticus); the Klebsormidiales (3 genera, 45 spp.); the Zygnematales (~ 50 genera, ~ ...
The upper Peechee Member of the Ancient Wall reef complex that is well exposed on the southeast margin of Mount Haultain represents the end of the first main depositional cycle of this complex. The uppermost part forms a 15-30 m thick carbonate sequence that extends basinward over deeper water fore-reef detritus and is divisible into three distinct layers: the lower two consist mainly of stromatoropoid and coral bioherms and biostromes and associated calcarenites and calcilutites; the uppermost consists of five small micrite and wackestone bioherms 7.5-22 m long and 4-6 m high; three of these grew around and on top of a 30 m wide stromatoporoid-coral biostrome. Frame-building organisms include laminar and hemispherical colonies of Phillip-sastrea, renalcid algae (often associated with small fenestral cavities), encrusting calcareous algae (Sphaerocodium), and laminar stromatoporoids. Renalcid encrustations of micrites and wackestones on the vertical sides and undersides of bioherms indicate that ...
Amarante (Portuguese pronunciation: [ɐmɐˈɾɐ̃t(ɨ)]) is a municipality and municipal seat in the northern Portuguese district of Porto. The population in 2011 was 56,264, in an area of 301.33 square kilometres (116.34 sq mi). The city itself had a population of 11,261 in 2001. Amarantes origin dates to the primitive peoples that hunted and gathered in the Serra da Aboboreira, sometime during the Stone Age, and extended during the Bronze Age and later the Romanization of the Iberian peninsula. The first prominent building erected during the area of Amarante was likely the Albergaria do Covelo do Tâmega sometime in the 12th century, by order of Queen D. Mafalda, wife of D. Afonso Henriques. These types of shelter were constructed in small settlements and were used by travellers, especially the poor who transited the territory. Permanent settles fixed themselves around the local churches, such as the Church of São Veríssimo and Church of Lufrei, resulting in growth during the intervening ...
Necrosis and ethylene-inducing peptide 1 (Nep1)-like proteins (NLPs) are secreted by several phytopathogenic micro-organisms. They trigger leaf necrosis and immunity-associated responses in various dicotyledonous plants. We identified glycosylinositol phosphorylceramides (GIPC), a major class of plant sphingolipids, as target molecules for NLP binding to plasma membranes. X-ray crystallography revealed that NLP forms complexes with terminal hexose moieties. NLP binding to GIPC head groups induces several conformational changes within the toxin that precedes membrane attachment and host cell lysis. This study unveils early steps of NLP cytolysin action and explains why dicot plants are NLP toxin-sensitive whereas monocot plants are not.
The Estrela Mountain Dog takes its name from the Serra da Estrela, a mountain range in mid Portugal. Because of its remote location, it is impossible to determine the origin of the breed, but it is believed to be one of the oldest breeds of the Iberian Peninsula. In the summer, shepherds moved the sheep up to the high mountain pastures where the Estrela Mountain Dog guarded the flocks. In the winter, when sheep were moved to the foot of the mountains, these same dogs guarded the shepherds households and occasionally served as draft animals. During the 1930s, Portugal underwent a revival of interest in their native breeds, and produced the first breed standard for the Estrela in 1933. The earliest dog as recorded by the American breed club was brought into the United States in 1998, although it is known that some were imported several years earlier. The Estrela Mountain Dog was recognized by United Kennel Club in 1996. ...
Researchers from Tubingen resolve how a plant steroid hormone makes plants grow. If one wants to better understand how plants grow, one must analyze the chemistry of life in its molecular detail. Michael Hothorn from the Friedrich-Miescher-Laboratory of the Max Planck Society in Tübingen and his team are doing just that. Their latest work now reveals that a plant membrane receptor requires a helper protein to sense a growth-promoting steroid hormone and to transduce this signal across the cell membrane.. Every cell is surrounded by a greasy cell membrane. Signals from other cells and from the environment must be sensed at the cell surface, transduced across this membrane and translated into a specific response inside the cell. All organisms have evolved membrane receptor proteins to get these complex tasks done, but plant membrane receptors look drastically different from the well-studied players in animals and bacteria. The plant steroid receptor BRI1, which can sense a small steroid hormone ...
Plant membranes are relatively permeable to K+ due to various selective K+ channels across the membrane. Basically, one distinguishes between low-affinity K+ channels and high-affinity channels. For the function of the low-affinity channels, the electrochemical difference between the cytosol and the outer medium (liquid in root or leaf apoplast) is of decisive importance. The K+ is imported into the cell for as long as the electrochemical potential in the cytosol is lower than in the outer solution. With the import of the positive charge (K+) the electrochemical potential increases (decrease of the negative charge of the cytosol) and finally attains that of the outer medium, equilibrium is attained, and there is no further driving force for the uptake of K+ (15). The negative charge of the cytosol is maintained by the activity of the plasmalemma H+ pump permanently excreting H+ from the cytosol into the apoplast and thus maintaining the high negative charge of the cytosol and building up an ...
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Metaphase chromosomes were analyzed in Aplastodiscus perviridis from the locations: Morro do Ferro (MG), Serra da Bocaina (SP), Botucatu (SP), and in Hyla albopunctata found at: Morro do Ferro, Botucatu, and Campinas (SP). A significant quantity of metaphases with structural alterations were found in the Morro do Ferro population. These alterations were classified as: decondensation, condensation, breaks, gaps, deletions and acentric fragments. Breaks, deletions and fragments were the most frequent alterations and a great number of these occurred near centromeric heterochromatin. The frequency of altered metaphases varied among individuals in all populations studied. The majority of the alterations can probably be attributed to the high level of natural radiation at Morro do Ferro ...
The paper concerns a microfauna of well-preserved radiolarians, foraminifers, and conodonts discovered in unusually large concretions occurring in black shale. The microfossils are recovered by dissolving pieces of the concretions in a diluted solution of formic acid. The assemblage is unusual because radiolarians of this age are very scarce and also because the microfossils occur in strata deposited on the near shore margin of the epicontinental interior sea present in Pennsylvanian time. Present day radiolarians are floating organisms that are found mostly in the upper part of the open ocean far from shore. Their tiny siliceous remains are very abundant in ocean bottom deposits at great depths. ...
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Zehra Ayhan, Donatella Duraccio, Birgül Özcan, Okan Eştürk, Serra Nalçabasmaz, Clara Silvestre, Sossio Cimmino, Gülsüm Erol, Murat Altan and Bengisu Toplu. B034 ...
Delirium is a very common and distressing neuropsychiatric syndrome in palliative care and a variety of other settings. It is associated with increases in morbidity, mortality, health care costs and most importantly in levels of patient and family distress. Inpatient palliative care is delivered in stand-alone hospice units and increasingly in designated units in acute care hospitals, where delirium occurrence rates of over 80% have been reported in the last hours and days before death. Most patients in these units have a cancer diagnosis. Given the increasing elderly proportion of the population, and that cancer is predominantly a disease of the elderly, there is a pivotal need to develop primary, secondary and tertiary preventative strategies for delirium in these patients.. Although sleep-wake cycle disturbance is not a core diagnostic criterion for delirium, studies of delirium in cancer patients have reported occurrence rates of 75-100%. This most likely reflects a circadian rhythm ...
The oldest-known animal eggs and embryos whose first pictures made th...This week a study in the same prestigious journal presents evidence f...The discovery complicates our understanding of microfossils thought t...Bailey made his discovery by combining two separate findings about Thi...In 2005 Thiomargarita discoverer Heide Schulz from the University of...,Oldest,animal,fossils,may,have,been,bacteria,biological,biology news articles,biology news today,latest biology news,current biology news,biology newsletters
A cluster of starch granules in microfossils extracted from a 1.2-million-year-old teeth with tartar or dental calculus shows that ancient man followed a balanced-diet.
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Questioning the oldest signs of life Simpson S SCIENTIFIC AMERICAN 288 (4): 70-77 APR 2003. Questioning the evidence for Earths oldest fossils Brasier MD, Green OR, Jephcoat AP, et al. NATURE 416 (6876): 76-81 MAR 7 2002. Necessary, but not sufficient: Raman identification of disordered carbon as a signature of ancient life Pasteris JD, Wopenka B ASTROBIOLOGY 3 (4): 727-738 WIN 2003. Earths oldest (similar to 3.5 Ga) fossils and the Early Eden hypothesis: Questioning the evidence Brasier M, Green O, Lindsay J, Steele A ORIGINS OF LIFE AND EVOLUTION OF THE BIOSPHERE 34 (1-2): 257-269 FEB 2004. Archean microfossils: a reappraisal of early life on Earth Altermann W, Kazmierczak J RESEARCH IN MICROBIOLOGY 154 (9): 611-617 NOV 2003. Self-assembled silica-carbonate structures and detection of ancient microfossils Garcia-Ruiz JM, Hyde ST, Carnerup AM, Christy AG, Van Kranendonk MJ, Welham NJ SCIENCE 302 (5648): 1194-1197 NOV 14 2003. Recognizing and interpreting the fossils of early eukaryotes ...
Every now and then it occurs to me just how silly vertebrate palaeontology is. Consider the following: access to specimens is extremely competitive, but, despite this, a vast wealth of material remains undocumented; chances of scoring funding are less than 5 per cent; a high proportion of the work you perform is unpaid; there are all sorts of political considerations when reporting new finds or sharing information and, aside from being nice to know, theres very little reason or rationale to investigate most extinct vertebrates - invertebrates and microfossils have utility in stratigraphy and hydrocarbon work, at least. All the same, people are falling over themselves to work in this profession, which means you have to be bristling with qualifications to even think of applying for an academic palaeo position. These qualifications dont come cheaply: in Britain, youre looking at three years of a relevant degree study, probably another year earning a Masters, then at least another three of PhD ...
Characeae)". Phytotaxa. 226 (2): 199-200. doi:10.11646/phytotaxa.226.2.11. Bruno Granier; Dany Azar; Sibelle Maksoud; Raymond ...
Rhodophyceae, Phaeophyceae, Characeae. Gera: Verlag Friedriech von Zezschwitz. pp. i-iv, 1-382, 122 (41 col.) pls.. ...
Rhodophyceae, Phaeophyceae, Characeae. Verlag Friedriech von Zezschwitz. Guiry, M.D.; G.M. Guiry (2009). "AlgaeBase". World- ...
Characeae are the principal plant life of some of the volcanic crater lakes of Nicaragua, and can be found in excess of 20 ... Vol.2, Characeae.. London, The Ray Society Stewart, N.F. and Church, J.M. 1992. Red Data Books of Britain and Ireland. The ... Introduced tilapia (Oreochromis niloticus) consumed all the Characeae in Lake Apoyo. Ref: Stewart & Church (1992). Chara ... Most Characeae are found in fresh water, usually in still, clear water where they attach to the substrate by rhizoids. They can ...
... or Moss-like plants Musci Hepaticae Characeae 3. Aphyllae Lichenes Fungi Algae p. 5 3 Alliances Algales p. 8 Diatomaceae ... ... Characeae Fungales, Fungi p. 29 Hymenomycetes ... Physomycetes Lichenales, Lichens p. 45 Graphidaceae Collemaceae Parmeliaceae ...
on directional conditions involving juice flow in the cell of Characeae). 1853: Das Individuum der Pflanze in seinem Verhältnis ... African Characeae). 1867: "Conspectus systematicus Characearum europaearum". 1870: Neuere Untersuchungen über die Gattungen ...
Iwabuchi K, Kaneko T, Kikuyama M (2006). "Ionic mechanism of mechano-perception in Characeae". Plant Cell Physiol. 46 (11): ...
Siphonocladiales Family 1. Valoniaceae Family 2. Dasycladaceae Class 2. Charophyceae Order Charales Family Characeae Order 1. ...
xiv, 282, 'Characeae'. Campbell, N. A. & Reece, J. B. 2005. Biology, Seventh Edition. Benjamin Cummings, San Francisco. Hoek, C ...
Siphonocladiales Family 1. Valoniaceae Family 2. Dasycladaceae Class 2. Charophyceae Order Charales Family Characeae ...
It is frequently found in association with the charophyte Palaeonitella (Characeae); if the ecology of Palaeonitella resembled ...
Flora of Derbyshire: Flowering Plants, Higher Cryptogams, Mosses and Hepatics, Characeae. London: Bemrose & Sons Ltd., 1903. ...
Characeae. London: Bemrose & Sons Ltd. Retrieved 2011-06-17. Painter, W. H. 1889 A contribution to the flora of Derbyshire, ...
... is a genus of charophyte green algae in the family Characeae. The species in the genus include: Nitella acuminata A. ...
Chara is a genus of charophyte green algae in the family Characeae. They are multicellular and superficially resemble land ...
From 1877, the two brothers took a keen interest in British Characeae. They also took an interest in molluscs. Henry left the ... In 1880 the two brothers published a review of the British Characeae. In 1884, Henry became Secretary of the South London ...
... specimens of the Characeae. Abbots Ripton: Institute of Terrestrial Ecology. Bennallick, Ian J; French, Colin N; Parslow, ...
Characeae)". American Journal of Botany. 84: 1516. doi:10.2307/2446612. JSTOR 2446612. Yoshiyama, Shinji; Ishigami, Mitsuo; ...
... and Characeae. Red Data List Vascular Plants of Ireland BiodiversityIreland.ie: National Biodiversity Data Centre - (Waterford ...
"On the earliest occurrence of Tolypella section Tolypella in the fossil record and the age of major clades in extant Characeae ...
They are seen as one of two most probable sister groups to land plant species, the second candidate group being the Characeae. ...
The first record of Nitellopsis obtusa (N.A.Desvaux) J.Groves (Charophycese, Characeae) in Ireland (H9, H10) Irish Naturalists ...
... of single cells, as seen in Phycomyces (Fungi) and Nitella (Characeae), is believed to be caused by a helical ...
Bacillariaceae Unterabteilung Euphyceae (Algae) [I (2)] Klasse Conjugatae Klasse Chlorophyceae Klasse Characeae Klasse ...
It is probably this power of vegetative propagation which explains the fact that species of Characeae are generally found ...
... and characeae found in the county, London: Bell, 1889 Review, J.E. Bagnall, Journal of Botany, 1899, 318 A History of the ...
The ultrastructural features of oospore wall ornamentation in the genus Tolypella were examined using scanning electron microscopy (SEM). The taxonomic relationships among several species were discussed on the basis of oospore ultrastructure and measurements. In the case of T. glomerata and T. nidifica, our results support the status of separate species. Close relationships and transitional forms may exist between T. nidifica and T. normaniana, and not only in oospore wall ornamentation. Oospores of T. hispanica exhibited the same distinct type of reticulate oospore wall as previously reported, but our results do not support the recognition of T. hispanica as a separate species. Ultrastructure of the oospore walls of T. prolifera and T. intricata was almost identical, suggesting that these species are closely related. We therefore reject previous suggestions that morphological characteristics of oospores as observed in SEM are sufficient for identification of individual species. Although ...
Rhodophyceae, Phaeophyceae, Characeae. Gera: Verlag Friedriech von Zezschwitz. pp. i-iv, 1-382, 122 (41 col.) pls.. ...
... of Characeae cells without inserting a microelectrode into the vacuole. Values of E_,vo, and R_m measured by this method are ... Open-vacuole method for measuring membrane potential and membrane resistance of Characeae cells. 元データ 日本植物生理学会 ... The Hydration-Induced Ca^ Release Is a General Phenomenon in Characeae Membrane Control of Cytoplasmic Streaming in Characean ... Potassium, sodium and Chloride in the protoplasm of characeae Mechanosensitive Ca^ Release from Intracellular Stores in Nitella ...
Characeae). Botanical Journal of The Linnean Society, 155 (4). pp. 467-476. ISSN 0024-4074 ...
Characeae)". Phytotaxa. 226 (2): 199-200. doi:10.11646/phytotaxa.226.2.11. Bruno Granier; Dany Azar; Sibelle Maksoud; Raymond ...
1965) Monograph of the Characeae. First part of a revision of the Characeae. Verlag von J. Cramer, Weinheim. ... McCourt, R. M., Karol, K. G., Guerlesquin, M., and Feist, M. (1996) Phylogeny of extant genera in the family Characeae ( ... Six living genera in a single family, the Characeae are known. Chara and Nitella contain the most species. Conventional ...
Rhodophyceae, Phaeophyceae, Characeae. Verlag Friedriech von Zezschwitz. Guiry, M.D.; G.M. Guiry (2009). "AlgaeBase". World- ...
Characeae. Warming (1884)[edit]. Warming, E., 1884. Haandbog i den systematiske botanik. Anden gjennemsete udgave. 2nd ed. ...
Characeae. *Nematophyta (Fungi et Lichenes). *Cormophyta (Phanerogamae omnes et Cryptogamae exclusis Nematophytis, Characeis et ...
Created: 13 February 2018 by Salvador Valenzuela Miranda. Verified by: 13 February 2018 by Salvador Valenzuela Miranda. Accesses: This record has been accessed by users 58 times since it was created.. Verification of data ...
Published in: Wood, R.D. (1965). A revision of the Characeae. First Part. Monograph of the Characeae. pp. i-xxiv, 1-904. ...
No distributional records for this taxon have been recorded by AlgaeBase to date. Generally, recent national lists or extensive regional or state lists have been employed to give a general indication of distribution.. Created: 30 April 2002 by M.D. Guiry. Verified by: 01 January 2011 by Anders Langangen. Accesses: This record has been accessed by users 386 times since it was created.. Verification of data ...
Stonewort, Brittlewort, Muskgrass Family: Characeae Scientific Name: Chara sp. Habit: Small malodorous aquatic plants lacking ...
Review of the species concepts Chara fibrosa and C. flaccida (Characeae, Charophyceae). Austral. Syst. Botany. 26(4): 291-297, ... Lamprothamnium in Australia (Characeae, Charophyceae). Austral. Syst. Botany. 26(4): 268-290, 13 figs.. 8 species described; ...
PART 1.MOSSES, HEPATICAE, LICHENS, CHARACEAE AND ALGAE. IN J. E. SMITH. 5(1):1-432. ENGLISH FLORA. LONDON. - ... Characeae, Naccariaceae, Rivulariaceae, Rhipiliaceae, Ulvaceae, Valoniaceae, Codiaceae, Sargassaceae, Dictyotaceae, ...
Nordstedt Braun in MUller Caledonia Central Plateau Chara fibrosa Chara fragilis Characeae species Charophyta cm high cm long ... J. Cramer in der Gebr der Borntraeger Verlagsbuchhandlung, 1995 - Characeae - 50 pages ... Australia South Esk River spec spine-cells Sterile branchlets Stipulodes stout striae Stuart subtilissima Tasmanian Characeae ...
50782 specimens found in the database ...
Collaborative Research: Phylogeny and Systematics of the Characeae (Charales). Co-PI with Dr. Kenneth Karol, New York Botanical ... Phylogenetic congruence of ribosomal operon and plastid gene sequences for the Characeae with an emphasis on Tolypella ( ... Characeae, Charophyceae). Phycologia 56:230-237.. *2016. McCourt, R. M., Karol, K. G., Hall, J. D., Casanova, M., T., Grant, M ...
Potassium, sodium and chloride in the protoplasm of characeae.Plant Cell Physiol. 15:103-110Google Scholar ...
Beih.110: Raam, Joop C. van: The Characeae of Tasmania. 1995. 80 p., 30 figs., ,ISBN 3-443-51032-9, paperback DM 48./ $29 ...
Family Characeae. Chara sp.. Class Pinopsida (conifers). Order Pinales. Family Pinaceae. Pinus muricata Don (bishop pine). ...
Salt tolerance at single cell level in giant-celled Characeae. *Mary Jane Beilby ...
Impact of climatic fluctuations on characeae biomass in a shallow, restored lake in The Netherlands ...
Characeae egg fragment. Cha.e. #. Müller, H H. Counting, palynology. 101. Dinoflagellate cyst indeterminata. Dinofl indet. #. ...
  • The experiments are performed on giant-celled algae Characeae (single cells are up to 1 mm in diameter and several cm in length), which allow extensive manipulation, such as perfusion of the cell contents with artificial solutions, removal of vacuole or permeabilization of the outer cell membrane. (edu.au)
  • Working from first principles, we propose a robust model of streaming emergence that combines motor dynamics with both microscopic and macroscopic hydrodynamics to explain how several independent processes, each ineffectual on its own, can reinforce to ultimately develop the patterns of streaming observed in the Characeae and other streaming species. (pnas.org)