Hydra wikipedia

hydra wikipedia

Гидра · — чудовище в древнегреческой мифологии, побеждённое Гераклом. · (лат. · — созвездие. · — спутник Плутона. · — река в Словакии. · — суперзлодейка из комиксов. Hydra · Hydra — игровой контроллер для ПК. · Hydra 70 — американская мм неуправляемая авиационная ракета. · Hydra — компьютерный чип, предназначенный для. Гидра (греч. ύδρα, лат. Hydra, по имени существа из древнегреческой мифологии) — созвездие южного полушария неба. Самая яркая звезда — Альфард.

Hydra wikipedia

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If the Hydra is sliced into many segments, the middle slices will form both a "head" and a "foot". There is both a head and foot activation and inhibition gradient. The head activation and inhibition works in an opposite direction of the pair of foot gradients. The inhibitors for both gradients have shown to be important to block the bud formation. The location that the bud will form is where the gradients are low for both the head and foot.

Daniel Martinez claimed in a article in Experimental Gerontology that Hydra are biologically immortal. In , Preston Estep published also in Experimental Gerontology a letter to the editor arguing that the Martinez data refute the hypothesis that Hydra do not senesce. The controversial unlimited lifespan of Hydra has attracted much attention from scientists. The transcription factor " forkhead box O " FoxO has been identified as a critical driver of the continuous self-renewal of Hydra.

In bilaterally symmetrical organisms Bilateria , the transcription factor FoxO affects stress response, lifespan, and increase in stem cells. If this transcription factor is knocked down in bilaterian model organisms, such as fruit flies and nematodes , their lifespan is significantly decreased. In experiments on H. An ortholog comparison analysis done within the last decade demonstrated that Hydra share a minimum of 6, genes with humans. Hydra is becoming an increasingly better model system as more genetic approaches become available.

The genomes of cnidarians are usually less than MB in size, as in the Hydra viridissima , which has a genome size of approximately MB. In contrast, the genomes of brown hydras are approximately 1 GB in size. This is because the brown hydra genome is the result of an expansion event involving LINEs, a type of transposable elements , in particular, a single family of the CR1 class. This expansion is unique to this subgroup of the genus Hydra and is absent in the green hydra, which has a repeating landscape similar to other cnidarians.

These genome characteristics make Hydra attractive for studies of transposon-driven speciations and genome expansions. From Wikipedia, the free encyclopedia. Genus of cnidarians. This article is about the aquatic animal. For the mythological monster, see Lernaean Hydra. For other uses, see Hydra disambiguation. Non-reproducing Creating a bud Daughter growing out Beginning to cleave Daughter broken off Daughter clone of parent.

Schuchert P ed. World Hydrozoa database. World Register of Marine Species. Retrieved 20 December Zoology Lab Manual 4th ed. Primis Custom Publishing. Biology 6th ed. The Journal of Biological Chemistry. PMID S2CID PMC Developmental Biology 6th ed. Retrieved 21 September Physiological Zoology. The University of Chicago Press. ISSN X. JSTOR Current Biology. Grolier Multimedia Encyclopedia. Grolier Online. Stuttgart: Spektrum Akademischer Verlag. ISBN Integrated principles of zoology Eighteenth ed.

New York, NY. OCLC Annals of the New York Academy of Sciences. FEBS Letters. Pharmacological and radioligand binding studies". Comparative Biochemistry and Physiology. C, Comparative Pharmacology and Toxicology. Journal of Visualized Experiments 93 : e European Journal of Cell Biology. ISSN Cell and Tissue Research.

Developmental Dynamics. Experimental Gerontology. Bibcode : PNAS.. March Bibcode : Natur. Categories : Hydridae Negligibly senescent organisms. URL consultato il 15 agosto URL consultato il 28 agosto Altri progetti Wikiquote. Portale Fumetti. Portale Marvel Comics. Categorie : Gruppi e organizzazioni Marvel Comics Organizzazioni criminali immaginarie. Menu di navigazione Strumenti personali Accesso non effettuato discussioni contributi registrati entra.

Namespace Voce Discussione. Visite Visualizza Modifica Modifica wikitesto Cronologia. Stan Lee Jack Kirby. Marvel Comics. Strange Tales vol. Editoriale Corno. EN «Hail, Hydra! IT «Hail, Hydra! Lo stesso argomento in dettaglio: Amalgam Comics.

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