نتایج جستجو برای: natural molting

تعداد نتایج: 483899  

Journal: :Reproduction, nutrition, developpement 1980
C Souty

The ultrastructure of follicle cells has been compared to that of developing oocytes in the marine crustacean isopod, Idotea balthica basteri, at different periods of the molting cycle. There was a distinct change in the shape and size of the follicles and in their relation to each other and to the oocytes. During stage 1 of vitellogenesis (molting cycle period C), spaces between the follicles ...

Journal: :Memorias do Instituto Oswaldo Cruz 1999
S L Garcia V L Rodrigues N L Garcia A N Ferraz Filho M L Mello

Survival and molting incidence were studied after heat (40 degrees C) and cold (0 degree C) shocks in specimens of Panstrongylus megistus with the aim of establishing its response to temperature stress under laboratory rearing conditions and to understand occasional changes in the biological characteristics of specimens captured in nature. The response to the thermal shocks was found to vary as...

2012
J. Sook Chung Hidekazu Katayama Heinrich Dircksen

Arthropod growth requires molt-associated changes in softness and stiffness of the cuticle that protects from desiccation, infection and injury. Cuticle hardening in insects depends on the blood-borne hormone, bursicon (Burs), although it has never been determined in hemolymph. Whilst also having Burs, decapod crustaceans reiterate molting many more times during their longer life span and are e...

2009
Thomas G. Wolcott Anson H. Hines

We have designed a new ultrasonic transmitter to track free-ranging premoIt blue crabs and signal the event of ecdysis. The transmitter (15 g in air, 5 g in water) operates for 6-8 weeks on a small lithium battery, producing 75-kHz tracking pulses at about I-sec intervals. It is attached to the crab's carapace, with a magnetic reed switch placed near the line where the carapace will separate fr...

2010
M. F. L. Lemos C. A. M. van Gestel A. M. V. M. Soares

Studies of the effects of endocrine-disrupting compounds (EDCs) on invertebrates are still largely underrepresented. This work aims to fill this gap by assessing the effects of bisphenol A (BPA) and vinclozolin (Vz) on the terrestrial isopod Porcellio scaber (common rough woodlouse). Male adult and sexually undifferentiated juvenile woodlice were exposed to the toxicants. Effects on molting reg...

2009
Carmen Galindo Gabriela Gaxiola Gérard Cuzon Xavier Chiappa-Carrara

Biochemical changes, specifically in hemocyanin and glucose concentrations in hemolymph, glycogen in the digestive gland, were studied throughout the molt cycle in juveniles of Litopenaeus vannamei in a high salinity condition (36), and related to variations in the osmotic capacity of organisms. Increasing hemolymph volume before molting modifies circulating glucose and hemocyanin concentration...

Journal: :The Journal of parasitology 1991
J K Baird W Riberu S Masbar Purnomo

The effect of ivermectin or diethylcarbamazine (DEC) on Wuchereria bancrofti molting from the third to the fourth larval stage (L3 to L4) was evaluated in vitro. L3 larvae were harvested from laboratory-reared Aedes togoi 2 wk after feeding upon a microfilaremic human volunteer. The larvae were kept in an artificial medium (Franke's NI medium) with 10% human serum under an atmosphere of 5% CO2 ...

Journal: :Journal of molecular cell biology 2010
Sheng Wang Shumin Liu Hanhan Liu Jiawan Wang Shun Zhou Rong-Jing Jiang William G Bendena Sheng Li

The insect steroid hormone 20-hydroxyecdysone (20E) acts through a specific nuclear receptor complex, ecdysone receptor (EcR) and ultraspiracle (USP). EcR and USP are FXR/LXR and RXR orthologs, respectively, which play critical roles in the regulation of lipid metabolism in mammals. Lipid concentration in Bombyx hemolymph and lipase activity in fat body peaked during molting and pupation, sugge...

پایان نامه :دانشگاه آزاد اسلامی - دانشگاه آزاد اسلامی واحد تهران مرکزی - دانشکده زبانهای خارجی 1391

the present study has tried to accomplish an analysis of margaret atwood’s novels oryx and crake, and the year of the flood in the light of posthuman and cyborg theories. considering posthumanism as a critical reading of some notions of humanism focus of which in this thesis has been identity, new definitions for humanity and human identity are formed. haraway’s cyborg, as one possible new figu...

Journal: :The Journal of experimental biology 2012
Maria A Echeverry-Galvis Michaela Hau

Costly events in the life history cycle of organisms such as reproduction, migration and pelage/plumage replacement are typically separated in time to maximize their outcome. Such temporal separation is thought to be necessitated by energetical trade-offs, and mediated through physiological processes. However, certain species, such as tropical birds, are able to overlap two costly life history ...

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