排序方式: 共有23条查询结果,搜索用时 15 毫秒
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Logunov DIu Cherenova LV Shmarov MM Shashkova EV Verkhovskaia LV Doronin KK Naroditskiĭ BS 《Molekuliarnaia genetika, mikrobiologiia i virusologiia》2002,(4):21-25
Recombinant adenoviruses capable of expressing the gene of secreted placentary alkaline phosphatase (SEAP) under control of CMV-promoter was obtained on the basis of CELO avian adenovirus and human adenovirus-5 (Ad5) genomes. The efficiency of the CELO vector was determined in experiments with transduction of human (293, A549, and H1299), mouse (B16), and avian (LMH) cell cultures. It was shown in C57BL/6 mice in vivo that SEAP gene is expressed under conditions of intravenous, intranasal, and intratumoral application of recombinant adenovirus CELO-SEAP. The duration of expression of the alkaline phosphatase CELO = SEAP gene in immunocompetent mouse body was 21 days. The level of SEAP gene expression was measured in the allantois fluid of chicken embryo infected with recombinant adenovirus CELO-SEAP. 相似文献
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Sebastian Persson Niek Welkenhuysen Sviatlana Shashkova Samuel Wiqvist Patrick Reith Gregor W. Schmidt Umberto Picchini Marija Cvijovic 《PLoS computational biology》2022,18(5)
Understanding the inherited nature of how biological processes dynamically change over time and exhibit intra- and inter-individual variability, due to the different responses to environmental stimuli and when interacting with other processes, has been a major focus of systems biology. The rise of single-cell fluorescent microscopy has enabled the study of those phenomena. The analysis of single-cell data with mechanistic models offers an invaluable tool to describe dynamic cellular processes and to rationalise cell-to-cell variability within the population. However, extracting mechanistic information from single-cell data has proven difficult. This requires statistical methods to infer unknown model parameters from dynamic, multi-individual data accounting for heterogeneity caused by both intrinsic (e.g. variations in chemical reactions) and extrinsic (e.g. variability in protein concentrations) noise. Although several inference methods exist, the availability of efficient, general and accessible methods that facilitate modelling of single-cell data, remains lacking. Here we present a scalable and flexible framework for Bayesian inference in state-space mixed-effects single-cell models with stochastic dynamic. Our approach infers model parameters when intrinsic noise is modelled by either exact or approximate stochastic simulators, and when extrinsic noise is modelled by either time-varying, or time-constant parameters that vary between cells. We demonstrate the relevance of our approach by studying how cell-to-cell variation in carbon source utilisation affects heterogeneity in the budding yeast Saccharomyces cerevisiae SNF1 nutrient sensing pathway. We identify hexokinase activity as a source of extrinsic noise and deduce that sugar availability dictates cell-to-cell variability. 相似文献
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I V Viktorov A A Lyzhin N A Shashkova 《Biulleten' eksperimental'no? biologii i meditsiny》1985,99(5):632-634
An original method of cultivation of reaggregated brain cells with the aid of high-speed portable mini-rollers is described. The mini-roller consists of parallel rollers and an electric motor rotating the flasks at a speed of 60 to 70 rpm. The Moscona technique was used for preparing brain cell suspensions. During cultivation of the suspension of dissociated cells in high-speed mini-rollers, reaggregates with an internal organotypic structure were obtained. The method suggested provides stable and reproducible results. 相似文献
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Eukaryotic vectors of Celo avian adenovirus genome,carrying GFP and human IL-2 genes 总被引:1,自引:0,他引:1
Shmarov MM Cherenova LV Shashkova EV Logunov DIu Verkhovskaia LV Kapitonov AV Neugodova GL Doronin KK Naroditskiĭ BS 《Molekuliarnaia genetika, mikrobiologiia i virusologiia》2002,(2):30-35
Recombinant CELO avian adenoviruses carrying green fluorescent protein (GFP) and and human interleukin-2 (IL-2) genes were obtained by homologous recombination in cell culture. The resultant recombinant CELO viruses are reproduced in chick embryos in the renal tubular and chorionic allantoic membrane cells. The ability of CELO vectors to transduce human and animal cells was studied in vitro (in cell cultures) and in vivo (in laboratory animals). GFP gene delivery and expression in recombinant CELO virus in tumors in C57BL/6 mice were for the first time demonstrated for B16 melanoma. Human IL-2 gene expression and protein accumulation in allantoic fluid of chick embryos infected with CELO-IL-2 vector were detected for the first time. 相似文献
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Glio-neuronal aggregates of dissociated cells obtained from embryonic brain during cultivation in rotating flasks were transfered for further cultivation into collagen gel, containing balanced salt solution, serum-free amino acid medium, or complete nutrient medium. Active neurite growth and glial cell migration were observed during cultivation in collagen gel. The experiments have shown that glio-neuronal aggregates may serve as an experimental model for testing the activity of different neuronotrophic and neurite growth stimulating factors. 相似文献
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Using the pTrc99A/P450scc vector, a plasmid was constructed in which cDNAs for cytochrome P450scc, adrenodoxin reductase, and adrenodoxin are situated in a single expression cassette. This plasmid was shown to direct the synthesis of all the above proteins in Escherichia coli. Their localization in the E. coli cells and stoichiometry were determined. Cell homogenates exhibited cholesterol hydroxylase/lyase activity, due to catalytically active forms of all three proteins. Thus, the full set of constituents of the mammalian cholesterol hydroxylase/lyase system was shown to be synthesized in bacterial cells for the first time. 相似文献