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Removal of potassium from Hydra culture medium produces a decrease in intracellular potassium and a parallel decrease in asexual growth rate. Rubidium and caesium are ineffective as substitutes for potassium in the maintenance of growth rate.
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jeb.biologists.org/cgi/content/abstract/69/1/45
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jeb.biologists.org/cgi/reprint/69/1/45
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Hydra oligactis, an evolutionarily primitive invertebrate, produced eggs or testes (sexual reproduction) when starved at 10 degrees C, and produced buds (asexual reproduction) when fed at 20 degrees C. ... Hydra oligactis, an evolutionarily primitive invertebrate, produced eggs or testes ... Reproduction [drug effects]
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www.medscape.com/medline/abstract/15886896
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Perhaps the best-known hydrozoan, familiar to most students of introductory biology, is Hydra, pictured at left. Hydra never goes through a medusoid stage and spends its entire life as a polyp. However, Hydra is not typical of the Hydrozoa as a whole.
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www.ucmp.berkeley.edu/cnidaria/hydrozoa.html
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This is called sexual reproduction because it involves two sexes: males and females, which produce sex cells. ... Asexual reproduction does not require sperms or eggs to be produced. Therefore a single individual can produce offspring in this way ... Hydra is a simple animal which shows asexual reproduction © Paul Billiet...
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www.saburchill.com/ans02/chapters/chap049.html
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Reproduction is a marvelous culmination of individual transcendence. Individual organisms come and go, but, to a certain extent, organisms "transcend" time by reproducing offspring. Let's take a look at reproduction in animals. ... Hydras exhibit this type of reproduction. Hydra Budding ; Image courtesy of BIODIDAC...
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biology.about.com/library/weekly/aa090700a.htm
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Agosti, C. G. and Stidwill, R. P., 1991. Invitro Migration Of Hydra Nematocytes - the Influence Of the Natural Extracellular Matrix (the Mesoglea), Of Collagen Type-Iv and Type-I, Laminin, ... Anonymous, 1951. Sexual reproduction in hydra. An autumnal occurrence as cold weather approaches. Water Life 6, 313.
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www.biology.pomona.edu/martinez/library.html
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Hydra genus, Hydra genus - Form, Hydra genus - Morphology, Hydra genus - Motion and locomotion, Hydra genus - Reproduction, Hydra genus - Feeding, Hydra genus - Morphallaxis, Hydra genus - Senescence...
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www.experiencefestival.com/a/Hydra_genus_-_Feeding/id/1...
www.experiencefestival.com/a/Hydra_genus_-_Feeding/id/1488702
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5. Longitudinal and transverse fission are probably not normal modes of reproduction of hydra but are methods of regulation of previously existing abnormalities or occur in specimens in a low metabolic state.
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www.biolbull.org/cgi/content/abstract/54/1/65
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