56 research outputs found
On the role of the proventricle region in reproduction and regeneration in Typosyllis antoni (Annelida: Syllidae)
Zur Determination der zeitlichen Verteilung von Fortpflanzungsprozessen in Laborkulturen des PolychaetenTyposyllis prolifera
Purification par chromatographie liquide de haute pression (HPLC) de l'hormone cérébrale chez Nereis diversicolor et Perinereis cultrifera (Annélides Polychètes)
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The effects of prostomium and proventriculus removal on sex determination and gametogenesis inTyposyllis pulchra (Polychaeta: Syllidae)
Normalization of sexual development in headless fragments of young femalePlatynereis dumerilii (Polychaeta) due to treatment with preserved prostomia of juvenile specimens
Anterior and caudal regeneration in the proterandric polychaeteOphryotrocha puerilis Clap. Mecz
Control of determination and the differentiation of the sexual somatic characters of Nereids (Annelida Polychaeta)
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Spatiotemporally regulated proteolysis to dissect the role of vegetative proteins during Bacillus subtilis sporulation: cell-specific requirement of σH and σA
Summary Sporulation in Bacillus subtilis is a paradigm of bacterial development, which involves the interaction between a larger mother cell and a smaller forespore. The mother cell and the forespore activate different genetic programs, leading to the production of sporulation-specific proteins. A critical gap in our understanding of sporulation is how vegetative proteins, made before sporulation initiation, contribute to spore formation. Here we present a system, spatiotemporally regulated proteolysis (STRP), which enables the rapid, developmentally regulated degradation of target proteins, thereby providing a suitable method to dissect the cell- and developmental stage-specific role of vegetative proteins. STRP has been used to dissect the role of two major vegetative sigma factors, σH and σA, during sporulation. The results suggest that σH is only required in predivisional cells, where it is essential for sporulation initiation, but that it is dispensable during subsequent steps of spore formation. However, evidence has been provided that σA plays different roles in the mother cell, where it replenishes housekeeping functions, and in the forespore, where it plays an unexpected role in promoting spore germination and outgrowth. Altogether, the results demonstrate that STRP has the potential to provide a comprehensive molecular dissection of every stage of sporulation, germination and outgrowth
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