.... Here, we show that cyt-c1L is highly expressed in the testis of D. melanogaster . Knockdown or mutation of cyt-c1L in early germ cells of flies resulted in male sterility. Immunofluorescence staining showed that cyt-c1L knockdown testes had no defects in early spermatogenesis; however, in late stages...

... mass. Vespertilio murinus Energetic trade-off Body condition Spermatogenesis Heterothermy Living in seasonal, often unpredictable environments is challenging for many animals. The optimization of assimilated energy allocation among competing life-history traits is central...

... or the speed of spermatogenesis to the prevailing social group size. M acrostomum pusillum 's relatively simple sperm morphology likely explains the short spermatogenesis duration we report, and is linked to a hypodermically inseminating mode of fertilization, which we show also means that these worms...

... investigations, we also demonstrated that both mRNA and protein were expressed in all phases, with two peaks of expression occurring in summer and in winter stasis. These highest levels of P450 aromatase are in line with the increase of 17β-estradiol, responsible for the spermatogenesis block typical...

... of threshold temperatures may be important for explaining their geographic distributions. * Author for correspondence (e-mail: joly@pge.cnrs-gif.fr ) 12 5 2004 © The Company of Biologists Limited 2004 2004 heat stress geographic race heat tolerance spermatogenesis climatic...

... proliferation via ERK1 activity. 24 3 2004 © The Company of Biologists Limited 2004 2004 ERK1 spermatogenesis photoperiod proliferation frog Rana esculenta The amphibians are the first tetrapods and therefore occupy a phylogenetic position of great interest. As cold-blooded...

...Monika Klissenbauer; Silke Winters; Uwe A. O. Heinlein; Thomas Lisowsky SUMMARY In this study, we investigated the expression of the mammalian FAD-dependent sulphydryl oxidase Erv1p/Alrp in the rat and mouse and during mouse spermatogenesis. Up to three forms of Alrp were identified in protein...

...Seong Eun Jeong; Yun Lee; Jeong Hee Hwang; Douglas C. Knipple SUMMARY We investigated the effects of sap of the common oleander Nerium indicum (Apocyanaceae) on male fertility and spermatogenesis in the oriental tobacco budworm Helicoverpa assulta . We found that continuous feeding of oleander sap...

... on the synthesis of vitellogenin and on testicular structure and cytology were investigated in male eelpout Zoarces viviparus during active spermatogenesis (May) and late spermatogenesis (June). Twenty-five days after injection, a significant dose-dependent increase in the plasma vitellogenin concentration...