Hydra oligactis, also known as the brown hydra, is a species of hydra found widely dispersed in the northern temperate zone. (wikipedia.org)
The relative length of the tentacles compared to the body is characteristic of the species and serves to differentiate it from any other brown Hydra of cool temperate waters. (wikipedia.org)
Light micrograph of Brown Hydra (Hydra oligactis) Magnification x8 at 35mm. (photoshelter.com)
Species4
In the study by TAI (1990) two hydra species ( Hydra oligogactis , and Chlorohydra viridissima ), one snail ( Physa heterostropha ), one midge ( Chironomus tentans ) and an amphipod ( Hyalella azteca ) were tested in a static test design with trivalent antimony (SbCl 3 ) for 4 days. (europa.eu)
The measured concentrations used (nominal concentration within brackets) for the two hydra species Hydra oligogactis and Chlorohydra viridissima were 1.18 (0.5), 1.52 (1.0), 2.56 (2.5), 4.48 (5.0), and 5.42 (6.25), and a control with 0 mg Sb/L (measured concentration). (europa.eu)
This slight difference may be due to several reasons such as interlaboratory differences, different sensitivities between the different hydra species tested, or the fact that the criteria used for defining the endpoints differ in sensitivity. (europa.eu)
Mechanistically, the activation of HyCARD2-HyGSDME axis at wound sites is dependent of intracellular mitochondrial reactive oxygen species (mtROS), the removing of which hindered Hydra head regeneration. (bvsalud.org)
Found1
Here, utilizing Hydra vulgaris as the research model, we found that an HyCARD2-HyGSDME-mediated pyroptosis signalling is activated in both head and foot regenerated tips after amputation. (bvsalud.org)
Results1
The hydra results from the study by Brooke et al. (europa.eu)
Sensitive3
When a cold sensitive strain of H. oligactis is subjected to temperature stress, it undergoes a shift from asexual budding to sexual reproduction. (wikipedia.org)
1986) which, although not considered reliable, does support the finding of Anon (1990) that the coelenterate hydra is the most sensitive invertebrate tested to date. (europa.eu)
Therefore, the hydras were the most sensitive invertebrates. (europa.eu)
Viridissima1
H. viridis now known as Chlorohydra viridissima is the green hydra of America and Europe. (biologydiscussion.com)
Vulgaris2
Hydra vulgaris (Hv) has a high regenerative potential and negligible senescence, as its stem cell populations divide continuously. (unige.ch)
The TG-rich region of an uncharacterized gene (ms-c25145) helps to distinguish between Eurasian H. vulgaris-Pallas strains (Hm-105, Basel1, Basel2 and reg-16), between Eurasian and North American H. vulgaris strains (H. carnea, AEP), and between the H. vulgaris and H. oligactis species. (unige.ch)
Regeneration6
Reaumur called it a polyp, while Linnaeus gave the name Hydra because of its special power of regeneration. (biologydiscussion.com)
We conclude that the evolutionarily-conserved role of ULK1 in autophagy initiation is crucial to maintain a dynamic homeostasis in Hydra, which supports regeneration efficiency and prevents aging. (unige.ch)
Here we propose to use the freshwater Hydra polyp as regeneration model organism to tackle this question. (unige.ch)
Indeed, Hydra is a simple animal that provides a powerful model system to understand how a highly dynamic homeostasis contributes to link wound healing to tissue repair and regeneration. (unige.ch)
HOMEOSTASIS & REGENERATION: What are the cellular and molecular mechanisms that maintain homeostasis in Hydra and drive regeneration after bisection? (unige.ch)
AGING: What are the mechanisms that keep the developmental program(s) such as head regeneration, foot regeneration and asexual reproduction (budding) accessible all along the hydra life? (unige.ch)
Genome1
Sun S, White RR, Fischer KE, Zhang Z, Austad SN, Vijg J. Inducible aging in Hydra oligactis implicates sexual reproduction, loss of stem cells, and genome maintenance as major pathways. (wikipedia.org)
Polyp2
Hydra, a small freshwater commonest polyp, is readily obtainable coelenterate. (biologydiscussion.com)
Hydra is a freshwater polyp that lost the medusa stage. (unige.ch)
Freshwater1
Hydra are freshwater polyps widely studied for their amazing regenerative capacity, adult stem cell populations, low senescence and value as ecotoxicological marker. (unige.ch)
Regenerative1
The ULK1 kinase, a necessary component of the pro-regenerative and anti-aging machinery in Hydra. (unige.ch)
Stem cells1
In contrast, the cold-sensitive H. oligactis (Ho_CS) rapidly develop an aging phenotype under stress, with epithelial stem cells deficient for autophagy, unable to maintain their self-renewal. (unige.ch)
Cold sensitive1
When a cold sensitive strain of H. oligactis is subjected to temperature stress, it undergoes a shift from asexual budding to sexual reproduction. (wikipedia.org)
Supports1
This definitively supports the relevance of Hydra as a model system to investigate complex biological questions [5, 6]. (unige.ch)
Animal1
Thus, the name Hydra was given to this animal because of its special power to regenerate its lost part like Hydre. (biologydiscussion.com)