منابع مشابه
Relationship of Intracellular Potassium to Asexual Reproduction in Hydra
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. Increases in intracellular potassium parallel increases in growth rate up to a level somewhat below the normal steady-state level of intracellular potassi...
متن کاملHydra
What is Hydra? Hydra is a member of the animal phylum Cnidaria. This phylum includes corals, sea anemones and jellyfish. While most cnidarians are marine, Hydra is unusual in that it lives exclusively in fresh water. Hydra was first described by Antoni van Leeuwenhoek (1632– 1723) in a letter he sent to the Royal Society on Christmas day, 1702. The letter included a red chalk drawing of Hydra o...
متن کاملSexual and asexual reproduction in a natural population of Hydra pseudoligactis
BELL, G., and L. M. WOLFE. 1985. Sexual and asexual reproduction in a natural population of Hydra pseudoligactis. Can. J. Zool. 63: 851 -856. Populations of Hydra pseudoligactis were censussed during 1980198 1 in a lake and a small pond in southern Quebec. Both natural and artificial substrates (glass slides) were used. Population density rose during the early part of the sedson to a maximum in...
متن کاملGrowth of endosymbiotic algae in the green hydra, Hydra viridissima
Stable endosymbiosis depends upon balanced growth of the symbionts. In green hydra, coincident patterns of host and algal mitotic index suggest that coordinated reproduction provides for balanced growth. However, when hydra shrink during food shortage, the population of endosymbiotic algae in a green hydra must likewise decline in size. Thus far, no mechanism of reducing the size of the endosym...
متن کاملHydra Groups
We give examples of CAT(0), biautomatic, free–by–cyclic, one–relator groups which have finite–rank free subgroups of huge (Ackermannian) distortion. This leads to elementary examples of groups whose Dehn functions are similarly extravagant. This behaviour originates in manifestations of Hercules–versus–the–hydra battles in string– rewriting. 2010 Mathematics Subject Classification: 20F65, 20F10...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Annals and Magazine of Natural History
سال: 1878
ISSN: 0374-5481
DOI: 10.1080/00222937808682436