Open Access. Powered by Scholars. Published by Universities.®
Articles 1 - 2 of 2
Full-Text Articles in Life Sciences
Cry1 Expression During Postnatal Development Is Critical For The Establishment Of Normal Circadian Period, Aaron Schirmer, Vivek Kumar, Andrew Schook, Eun Joo Song, Michael S. Marshall, Joseph S. Takahashi
Cry1 Expression During Postnatal Development Is Critical For The Establishment Of Normal Circadian Period, Aaron Schirmer, Vivek Kumar, Andrew Schook, Eun Joo Song, Michael S. Marshall, Joseph S. Takahashi
Biology Faculty Publications
The mammalian circadian system generates an approximate 24-h rhythm through a complex autoregulatory feedback loop. Four genes, Period1 (Per1), Period2 (Per2), Cryptochrome1 (Cry1), and Cryptochrome2 (Cry2), regulate the negative feedback within this loop. Although these proteins have distinct roles within the core circadian mechanism, their individual functions are poorly understood. Here, we used a tetracycline trans-activator system (tTA) to examine the role of transcriptional oscillations in Cry1 and Cry2 in the persistence of circadian activity rhythms. We demonstrate that rhythmic Cry1 expression is an important regulator of circadian period. We then define a critical period from birth to postnatal day …
Mobilization And Role Of Starch, Protein, And Fat Reserves During Seed Germination Of Six Wild Grassland Species, Ming Zhao, Hongxiang Zhang, Hong Yan, Lu Qiu, Carol C. Baskin
Mobilization And Role Of Starch, Protein, And Fat Reserves During Seed Germination Of Six Wild Grassland Species, Ming Zhao, Hongxiang Zhang, Hong Yan, Lu Qiu, Carol C. Baskin
Biology Faculty Publications
Since seed reserves can influence seed germination, the quantitative and qualitative differences in seed reserves may relate to the germination characteristics of species. The purpose of our study was to evaluate the correlation between germination and seed reserves, as well as their mobilization during germination of six grassland species (Chloris virgata, Kochia scoparia, Lespedeza hedysaroides, Astragalus adsurgens, Leonurus artemisia, and Dracocephalum moldavica) and compare the results with domesticated species. We measured starch, protein, and fat content in dry seeds and the initial absorption of water during imbibition. Starch, soluble protein, fat, and soluble …