منابع مشابه
Hydra
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 کاملFighting poverty, fighting AIDS.
J effrey sachs is an economist, not an evangelist. But give the man 10 minutes behind a microphone, and a scholarly symposium starts to feel like a revival meeting. “Ladies and gentlemen,” he tells a hushed hall after describing how AIDS sufferers die in Malawi for want of $1-a-day drugs, “this plague is exploding. Its consequences will make the world quake. Rich countries could stop the devast...
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 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 کاملFighting infections
Fighting disease: In the first �eca�es after the intr��ucti�n �f antibi�tics,� there �as �i�es�rea� ��timism that the fi�ht a�ainst infecti�us �isease c�ul� be ��n. This early a�vert f�r �enicillin �as tar�ete� at W�rl� War II servicemen. (Picture: Wiki�e�ia.) F�r a fe� �eca�es,� ar�un� the mi��le �f the 20th century,� there �as �i�es�rea� ��timism that science c�ul� �in the fi�ht a�ainst infec...
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ژورنال
عنوان ژورنال: TSANTSA – Journal of the Swiss Anthropological Association
سال: 2017
ISSN: 2673-5377,1420-7834
DOI: 10.36950/tsantsa.2017.22.7346