androgen
androgen One of a group of male sex hormones that stimulate development of the testes and of male
secondary sexual characteristics (such as growth of facial and pubic hair in men).
Testosterone is the most important. Androgens are produced principally by the testes when stimulated with
luteinizing hormone but they are also secreted in smaller amounts by the adrenal glands and the ovaries. Injections of natural or synthetic androgens are used to treat hormonal disorders of the testes and breast cancer and to build up body tissue (see
anabolic steroid).
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Observations on feeding behavior by the terrestrial flatworm bipalium adventitium (platyhelminthes: Tricladida: Terricola) from Illinois
Magazine article from: The American Midland Naturalist; 10/1/2002; ; 700+ words
; ABSTACT.-Bipalium adventitium Hyman, 1943, an exotic terrestrial flatworm that is predatory on earthworms, is reported from Illinois for the first time. No-choice laboratory feeding tests were performed to test the acceptability of several lumbricid earthworm species as prey for B. adventitium and
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Asexual Reproduction in Pygospic elegans C1aparede (Annelida, Polychaeta) in Relation to Parasitism by Lepocreadium setiferides (Miller and Northup) (Platyhelminthes, Trematoda).
Magazine article from: The Biological Bulletin; 8/1/2001; ; 700+ words
; DEAN G. MCCURDY Abstract. Life-history theory predicts that parasitized hosts should alter their investment in reproduction in ways that maximize host reproductive success. I examined the timing of asexual reproduction (fragmentation and regeneration) in the polychaete annelid Pygospic elegans
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Microdistribution of tetrodotoxin in invertebrates characterized.
Newspaper article from: Pain & Central Nervous System Week; 12/27/2004; 700+ words
; ...Nemertea) and a turbellarian Planocera reticulata (phylum Platyhelminthes) on light microscopy by means of a monoclonal anti-TTX...Palaeonemertea: Cephalotrichidae) and Planocera reticulata (Platyhelminthes: Turbellaria: Polycladida: Planoceridae). Toxicon...
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Studies from University of Sassari reveal new findings on marine ecology.
Newspaper article from: Ecology, Environment & Conservation; 9/26/2008; 700+ words
; ...studying the composition and distribution of free-living Platyhelminthes in the area, potential invaders of the Mediterranean Sea...Genetic differentiation among populations of Minona ileanae (Platyhelminthes: Proseriata) from the Red Sea and the Suez Canal. Journal...
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Myogenesis in the basal bilaterian Symsagittifera roscoffensis (Acoela).(Research)(Report)
Magazine article from: Frontiers in Zoology; 9/19/2008; ; 700+ words
; ...traditionally been assigned to the taxon Turbellaria within Platyhelminthes [2]. At present, three major flatworm-like clades are often considered valid, namely Platyhelminthes, Nemertodematida and Acoela, of which the latter two often...
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New parasitology findings from University of Corsica described.(Report)
Newspaper article from: Science Letter; 7/28/2009; 678 words
; ...study is to highlight criteria which can be interesting in Platyhelminthes phylogeny." Quilichini and colleagues published their...Sperm ultrastructure of the digenean Siphoderina elongata (Platyhelminthes, Cryptogonimidae) intestinal parasite of Nemipterus furcosus...
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Identification and characteristics of microRNAs from Bombyx mori.(Research article)
Magazine article from: BMC Genomics; 5/28/2008; ; 700+ words
; ...species of Arthropod , closely related to Nematodes and Platyhelminthes . MiRBase contains 355 miRNA genes in Arthropods (mosquito...in Nematodes ( C. elegans and C. briggsae ) and 63 in Platyhelminthes ( Schmidtea mediterranea ) [34]. Of the 355 Arthropod...
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Developmentally regulated expression, alternative splicing and distinct sub-groupings in members of the Schistosoma mansoni venom allergen-like (SmVAL) gene family.(Research article)
Magazine article from: BMC Genomics; 2/23/2008; ; 700+ words
; ...Schistosomes are dioecious metazoan parasites of the phylum Platyhelminthes, which are estimated to infect more than 200 million people...across phyla and, as such, warrant further study in the Platyhelminthes as potential modulators of immune function, components...
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Scientists at University of Guelph publish research in molecular ecology.
Newspaper article from: Ecology, Environment & Conservation; 6/12/2009; 700+ words
; ...According to a study from Guelph, Canada, The phylum Platyhelminthes is a diverse group of flatworms that includes parasites...cytochrome c oxidase I gene in digenetic trematodes (Platyhelminthes) illustrates the challenge of barcoding parasitic...
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Research on evolution described by scientists at University of Barcelona.
Newspaper article from: Science Letter; 10/13/2009; 700+ words
; ...Recent molecular phylogenies have convincingly shown that the acoel flatworms, traditionally classified within the Platyhelminthes, are the sister group of the remaining Bilateria, branching out before the common ancestor of protostomes, and...
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Platyhelminthes
Book article from: Animal Sciences
Platyhelminthes Animals in the phylum Platyhelminthes are called flatworms because they are flattened from...ectoderm, mesoderm , and endoderm. Animals within Platyhelminthes show more complexity than ancestral phyla, but are...
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Nemertini
Book article from: A Dictionary of Zoology
...which are bilaterally symmetrical and elongate. Externally they resemble Platyhelminthes (flatworms) but are generally larger and more elongated. Unlike Platyhelminthes they have a mouth and anus which allows ingestion and egestion to occur...
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Trematoda
Book article from: Animal Sciences
...flukes are the common names for the flatworms in the class Trematoda, phylum Platyhelminthes. Trematodes have most of the same features as other classes of Platyhelminthes. They are acoelomate , unsegmented, bilaterally symmetrical triploblasts...
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Paleontology
Encyclopedia entry from: The Gale Encyclopedia of Science
...evolutionary breakthrough. The most primitive bilaterally symmetrical animals are the flatworms (phylum Platyhelminthes). Platyhelminthes gave rise to the coelomates, which have a coelom, or internal body cavity. The coelomates split into...
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Turbellaria
Book article from: Animal Sciences
...class Turbellaria is the most primitive group within the phylum Platyhelminthes, the flatworms. Turbellarians share some important characteristics with other Platyhelminthes. All flatworms are flattened dorsoventrally . They are bilaterally...
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