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991.
Summary In a cell-free homogenate of the blue-green algaMicrocystis aeruginosa gas vacuoles are assembled within the first half hour after incubation. 相似文献
992.
993.
994.
A chicken embryo protein related to the mammalian DEAD box protein p68 is tightly associated with the highly purified protein-RNA complex of 5-MeC-DNA glycosylase. 总被引:6,自引:1,他引:5 下载免费PDF全文
J P Jost S Schwarz D Hess H Angliker F V Fuller-Pace H Stahl S Thiry M Siegmann 《Nucleic acids research》1999,27(16):3245-3252
995.
John T. Kemper 《Bulletin of mathematical biology》1978,40(6):707-718
A deterministic model for a multi-agent disease epidemic with asymptomatic attacks is proposed and investigated. The limitations
inherent in the assumptions of the model are discussed in connection with specific agents of disease. The mathematical treatment
of the model is separated into analyses of the equilibrium situation and the transient behavior of the disease outbreak. Explicit
formulas are derived for the number of susceptibles in the population as well as for the numbers of each type of infective—those
with and without symptoms. These theoretical results are followed by a discussion of the practical considerations which must
be taken into account to obtain useful information from the model.
This work was supported in part by National Library of Medicine Training Grant Number 5 T01 LM00160 and in part by National
Institutes of Health National Research Service Award Number 1 F32 GMO 5839 from the Institute of General Medical Sciences. 相似文献
996.
997.
Antonio G. González Raimundo Freire Rosendo Hernández Jost A. Salazar Ernesto Suárez 《Phytochemistry》1973,12(11):2733-2735
From stems and leaves of Semele androgyna L. the new steroid sapogenin 25S-dihydrodracogenin (Ia) has been isolated and its structure confirmed by conversion into the acetates of 25R-dihydrosansevierigenin (Id) and ruscogenin (If) and by partial hydrogenation of dracogenin. 相似文献
998.
999.
Summary Heterocysts of Anabaena cylindrica, isolated rapidly in the cold, were found—in contrast to earlier reports—to contain all of the same lipids and lipophilic pigments, and in about the same proportions, as vegetative cells. In broken filaments and in heterocysts damaged during isolation, the membrane lipids and certain pigments (myxoxanthophyll and an unidentified red pigment) break down rapidly. The glycolipids specific to heterocyst-forming blue-green algae are localized in the laminated layer of the heterocyst envelope. A possible role of the laminated layer is discussed. 相似文献
1000.
Xiaojing Yang Anna Payne-Tobin Jost Orion D. Weiner Chao Tang 《Molecular biology of the cell》2013,24(15):2419-2430
Protein localization plays a central role in cell biology. Although powerful tools exist to assay the spatial and temporal dynamics of proteins in living cells, our ability to control these dynamics has been much more limited. We previously used the phytochrome B– phytochrome-interacting factor light-gated dimerization system to recruit proteins to the plasma membrane, enabling us to control the activation of intracellular signals in mammalian cells. Here we extend this approach to achieve rapid, reversible, and titratable control of protein localization for eight different organelles/positions in budding yeast. By tagging genes at the endogenous locus, we can recruit proteins to or away from their normal sites of action. This system provides a general strategy for dynamically activating or inactivating proteins of interest by controlling their localization and therefore their availability to binding partners and substrates, as we demonstrate for galactose signaling. More importantly, the temporal and spatial precision of the system make it possible to identify when and where a given protein''s activity is necessary for function, as we demonstrate for the mitotic cyclin Clb2 in nuclear fission and spindle stabilization. Our light-inducible organelle-targeting system represents a powerful approach for achieving a better understanding of complex biological systems. 相似文献