The objective of this study was to investigate the impact of long-term pyrene exposure on molting and reproduction in the model estuarine invertebrate, the grass shrimp (Palaemonetes pugio). Grass shrimp were exposed to measured concentrations of 5.1, 15.0, and 63. 4 ppb (microg/L) pyrene for 6 weeks, during which time we determined molting and survivorship. At the end of the exposure, we immed...

Juvenile noble crayfish, Astacusastacus (Crustacea, Astacidea) in the second year of age were kept in the laboratory for a twelve-month period under continuing "summer conditions" (LD 16:8, 19°C). Molting processes in this population could be synchronized by artificial moonlight cycles. Peaks of exuviations occurred at "new moons". Males showed a slightly higher degree of synchronization than f...

Satellite-based tracking of migratory waterfowl is an important tool for understanding the potential role of wild birds in the long-distance transmission of highly pathogenic avian influenza. However, employing this technique on a continental scale is prohibitively expensive. This study explores the utility of stable isotope ratios in feathers in examining both the distances traveled by migrato...

Ecdysteroids, primarily 20-hydroxyecdysone (20E), play a central role in the growth of arthropods. Molecular target of the ecdysteroids is known as a receptor complex composed of ecdysone receptor (EcR) and ultraspiracle (USP) protein. It is important to clarify the expression profile of EcR/USP in crustacean for understanding the endocrine disrupting effects of environmental xenobiotics on cru...

Didelphis virginiana (Virginia Opossum) continues to spread further north into temperate North America, raising questions regarding how they survive harsh winters. Very few marsupials exhibit winter adaptations such as torpor or seasonal molting. We used stable isotopes evaluate evidence of molting in Opossums. serially cut hairs from captive Opossums determine if a documented diet shift early ...

T he nematode worm, C. elegans, sheds its exoskeleton at particular life stages, and Alison Frand believes that understanding this molting process might provide new insights into diseases affecting humans. Some of the potential medical benefi ts lie in the similarities between the worms' exoskeleton and our own skin and connective tissues, while other benefits might lie in the unique aspects of...

1. Polyacrylamide gel electrophoresis (PAGE) in 4% gels of Blatta orientalis larval hemolymph revealed 4 major proteins. 2. Maximum incorporation of [14C]-leucine into total hemolymph protein occurs within 24 hr and is followed by negligible turnover in the next 24 hr. 3. Quantitative PAGE was used to monitor concentration changes during the molting cycle in synchronously molting cultures. 4. A...

Permasalahan yang sering dijumpai dalam budidaya yaitu penggunan pakan komersial cukup tinggi, mencapai sekitar 60-70% dari biaya produksi dikeluarkan. Penelitian ini bertujuan untuk menganalisis pengaruh penambahan daun kelor dan probiotik pada terhadap performa udang vaname. dilaksanakan bulan Juni sampai Juli 2020. Metode penelitian menggunakan RAL dengan 4 perlakuan 3 ulangan yaitu, komersi...