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21.
本文从构建杂种细胞14-7-1的基因组文库出发,用种特异的探针分离出含有人体基因组顺序的重组子,并进一步分析了其中13个克隆,得到8个单拷贝顺序。通过与已建立的杂种细胞克隆分布板杂交以及染色体的原位杂交方法,将1个单拷贝顺序FD11-1定位在11p11-q11上。由于已经报道在11号染色体上具有3个连锁群,它们分别位于11p15、11p13和11q13上,因此,FD11-1有可能为11号染色体连锁基因图的建立提供1个有意义的座位。 相似文献
22.
Peter Tass 《Journal of biological physics》1996,22(1):27-64
We present a stochastic approach to phase-resetting of an ensemble of oscillators. In order to describe stimulation-induced dynamical phenomena we develop a stochastic model which consists of an ensemble of phase oscillators interacting via random forces. Every single oscillator is submitted to a phase stimulus. The ensemble's dynamics is determined by a Fokker-Planck equation. The stationary states are calculated explicitly, whereas the transients are analysed numerically. If the stimulus of a given (non-vanishing) intensity is administered at a critical initial cluster phase for a critical duration T
crit the ensemble's synchronized oscillation is annihilated. A transition from type 1 resetting to type 0 resetting occurs when the stimulation duration exceeds T
crit. Stimulation causes a shift of the mean frequency of every single oscillator. This frequency shift is explicitly calculated by deriving the mean first passage time. The model shows that there is a subcritical intensity which is connected with an enhanced vulnerability to stimulation. The desynchronized states, the so-called black holes, are typically associated with a double peak in the ensemble's phase distribution. This is important for analysing experimental data because simple peak-detection algorithms are not able to extract the underlying dynamics.Our results are discussed from the experimentator's point of view so that the insights derived from our model can improve data analysis and design of stimulation experiments. 相似文献
23.
Summary Chickpea was micropropagated by axillary shoot proliferation (ASP) and modified single node culture (MSNC) methods. Maximum
propagule proliferation occurred on Murashige and Skoog (MS) medium enriched with 1–10 μM N6-benzyladenine and 0.01 μM α-naphthaleneacetic acid. The propagules were rooted on MS medium containing 1 μM 3-indolebutyric acid and B5 vitamins. Regenerated plants were fertile and phenotypically similar to control plants grown from seed. The MSNC method was
four times more efficient than the ASP method in terms of the number of plants produced per explant. 相似文献
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To understand force generation under a wide range of loads, the stepping of single kinesin molecules was measured at loads from −20 to 42 pN by optical tweezers with high temporal resolution. The optical trap has been improved to halve positional noise and increase bandwidth by using 200-nm beads. The step size of the forward and backward steps was 8.2 nm even over a wide range of loads. Histograms of the dwell times of backward steps and detachment fit well to two independent exponential equations with fast (~0.4 ms) and slow (>3 ms) time constants, indicating the existence of a fast step in addition to the conventional slow step. The dwell times of the fast steps were almost independent of the load and ATP concentration, while those of the slow backward steps and detachment depended on those. We constructed the kinetic model to explain the fast and slow steps under a wide range of loads. 相似文献
28.
H. Rodríguez R. Alvarez A. Enríquez 《World journal of microbiology & biotechnology》1993,9(2):213-215
Biomass production of Cellulomonas was optimal with 1% (w/v) bagasse pith pre-treated with either 0.2 M NaOH for 1 h at 80°C or 0.4 M NaOH for 40 h at 28 to 30°C. Growth was similar to that obtained with a more severe treatment used as control and compared well with other reports for cellulolytic bacteria cultivated on pre-treated bagasse pith. 相似文献
29.
Hideaki Matsuoka Yasushi Kazuno Takuji Horie Tomoo Homma Yasuyuki Nemoto 《Cytotechnology》1993,11(1):59-65
Possible roles of coexisting cells in inducing neurite growth from a nerve cell were studied. Nerve growth factor (NGF)-inducing neurite growth from PC12h-R (a cell line derived from cultured nerve cells) was investigated at various cell densities. At the cell density 102104 cells/ml neurites appeared even without NGF. In contrast, no neurite appeared without NGF in single cell culture. The neurite growth observed in plural cell culture without NGF was only partially inhibited by antibody to NGF receptor (Ab-NGFR). However, the effect of the used medium alone was mostly inhibited by Ab-NGFR. These results suggest that the neurite inducing potency of coexisting cells is via different sites than the NGF receptor.Abbreviations Ab-IgG-FITC
anti-mouse-IgG labeled with fluorescein isothiocyanate
- Ab-NF
monoclonal antibody to neurofilament 160 kD
- Ab-NGFR
monoclonal antibody to NGF receptor
- BDNF
brain-derived neurotrophic factor
- D-medium
medium for differentiation culture
- DMEM
Dulbecco's modified Eagle's medium
- M-medium
medium for multiplication culture
- NGF
nerve growth factor
- NGFR
NGF receptor
- NT-3
neurotrophin-3
- PC12
pheochromocytoma cell line
- PC12h-R
subclone of PC12
- Sup-D
supernatant of D-medium 相似文献
30.
单链抗体(single chain antibody fragment,scFv)是由抗体重链可变区(variable region of heavy chain,VH)和轻链可变区(variable region of light chain,VL)通过柔性短肽连接组成的小分子,是具有完整抗原结合活性的最小功能片段,包含抗体识别及抗原结合部位。相比于其他抗体,scFv具有分子量小、穿透性强、免疫原性弱、易构建表达等优点。目前,scFv最常用的展示系统主要有噬菌体展示系统、核糖体展示系统、mRNA展示系统、酵母细胞表面展示系统和哺乳动物细胞展示系统等。近年来,随着scFv在医学、生物学、食品安全学等领域的发展,使得其在生物合成和应用研究方面备受关注。本文对近年来scFv展示系统的研究进展作一综述,以期为scFv的筛选及应用提供理论基础。 相似文献