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101.
L M Roy K I Swenson D H Walker B G Gabrielli R S Li H Piwnica-Worms J L Maller 《The Journal of cell biology》1991,113(3):507-514
Functional clam cyclin A and B proteins have been produced using a baculovirus expression system. Both cyclin A and B can induce meiosis I and meiosis II in Xenopus in the absence of protein synthesis. Half-maximal induction occurs at 50 nM for cyclin A and 250 nM for cyclin B. Addition of 25 nM cyclin A to activated Xenopus egg extracts arrested in the cell cycle by treatment with RNase or emetine activates cdc2 kinase to the normal metaphase level and stimulates one oscillatory cell cycle. High levels of cyclin A cause marked hyperactivation of cdc2 kinase and a stable arrest at the metaphase point in the cell cycle. Kinetic studies demonstrate the concentration of cyclin A added does not affect the 10 min lag period required for kinase activation or the timing of maximal activity, but does control the rate of deactivation of cdc2 kinase during exit from mitosis. In addition, exogenous clam cyclin A inhibits the degradation of both A- and B-type endogenous Xenopus cyclins. These results define a system for investigating the biochemistry and regulation of cdc2 kinase activation by cyclin A. 相似文献
102.
Orazio Cantoni R. Mark Evans Max Costa 《Biochemical and biophysical research communications》1982,108(2):614-619
Pronounced strand breakage of DNA analyzed by alkaline elution techniques was produced in intact Chinese hamster ovary cells by 25 μM HgCl2 within 1 hr or 100 μM HgCl2 within 15 min. HgCl2-induced strand breakage was directly proportional to concentration up to 100 μM and to time within 1 hr. Levels of reduced glutathione decreased following HgCl2 in parallel with the induction of DNA strand breakage. Evidence is presented that this rapid and pronounced induction of DNA strand breaks and other cytotoxic responses following acute exposure to HgCl2 resembles the cellular effects of X-rays. 相似文献
103.
104.
Graziella Tocco Antonella Fais Gabriele Meli Michela Begala Gianni Podda M.Benedetta Fadda Marcella Corda Orazio A. Attanasi Paolino Filippone Stefano Berretta 《Bioorganic & medicinal chemistry letters》2009,19(1):36-39
In this work, the PEG-immobilization and the liquid phase synthesis of some coumarins derived from cardol are presented. Some preliminary results on their tyrosinase inhibitory activity are also included. 相似文献
105.
Antonio Montresor David Addiss Marco Albonico Said Mohammed Ali Steven K. Ault Albis-Francesco Gabrielli Amadou Garba Elkhan Gasimov Theresa Gyorkos Mohamed Ahmed Jamsheed Bruno Levecke Pamela Mbabazi Denise Mupfasoni Lorenzo Savioli Jozef Vercruysse Aya Yajima 《PLoS neglected tropical diseases》2015,9(10)
106.
Paolo Mosci Donatella Pietrella Giovanni Ricci Neelam Pandey Claudia Monari Eva Pericolini Elena Gabrielli Stefano Perito Francesco Bistoni Anna Vecchiarelli 《Mycopathologia》2013,175(1-2):1-11
The animal models available for studying the immune response to genital tract infection require induction of a pseudo estrous state, usually achieved by administration of 17-β-estradiol. In our experimental model of vaginal candidiasis, under pseudo estrus, different strains of mice were used. We observed major differences in the clearance of Candida albicans infection among the different strains, ascribable to differing susceptibility to estradiol treatment. In the early phase of infection CD1, BALB/c, C57BL/6 albino and C57BL/6 mice were colonized to similar levels, while in the late phase of infection, BALB/c mice, which are considered genetically resistant to C. albicans infection, exhibited greater susceptibility to vaginal candidiasis than CD1 and C57BL/6 albino strains of mice. This was because estradiol induced “per se” enlarged and fluid-filled uteri, more pronounced in infected mice and consistently more evident in BALB/c and C57BL/6 mice than in CD1 mice. Unlike CD1, BALB/c and C57BL/6 mice showed a heavy fungal colonization of the uterus, even though C57BL/6 mice apparently cleared C. albicans from the vagina. The presence of C. albicans in the vagina and uterus was accompanied by a heavy bacterial load. Collectively these observations prompted us to carry out a careful analysis of estradiol effects in a mouse model of vaginal infection. 相似文献
107.
Russo L Landi E Tampieri A Natalello A Doglia SM Gabrielli L Cipolla L Nicotra F 《Carbohydrate research》2011,(12):1564-1568
An efficient method for the direct and covalent decoration of granules of nanostructured apatite with a sample monosaccharide is presented; the hydroxyapatite material was directly functionalised with a short azido-containing spacer arm, to which α-propargyl glucopyranoside has been chemoselectively ligated by Huisgen-type cycloaddition. The ‘glycosylated’ hydroxypatite was characterised by its ability to interact with glucose recognising lectins. 相似文献
108.
Yanjiao Ma Yuan Ma Gabriele Giuli Holger Euchner Axel Groß Giovanni Orazio Lepore Francesco d'Acapito Dorin Geiger Johannes Biskupek Ute Kaiser Hanno M. Schütz Anna Carlsson Thomas Diemant Rolf Jürgen Behm Matthias Kuenzel Stefano Passerini Dominic Bresser 《Liver Transplantation》2020,10(25)
The development of alternative anode materials with higher volumetric and gravimetric capacity allowing for fast delithiation and, even more important, lithiation is crucial for next‐generation lithium‐ion batteries. Herein, the development of a completely new active material is reported, which follows an insertion‐type lithiation mechanism, metal‐doped CeO2. Remarkably, the introduction of carefully selected dopants, herein exemplified for iron, results in an increase of the achievable capacity by more than 200%, originating from the reduction of the dopant to the metallic state and additional space for the lithium ion insertion due to a significant off‐centering of the dopant atoms in the crystal structure, away from the original Ce site. In addition to the outstanding performance of such materials in high‐power lithium‐ion full‐cells, the selective reduction of the iron dopant under preservation of the crystal structure of the host material is expected to open up a new field of research. 相似文献
109.
Pyruvate carboxylase activity of mammalian brain cortex 总被引:5,自引:0,他引:5
110.