共查询到20条相似文献,搜索用时 15 毫秒
1.
I. Y. Rauschenbach L. B. Golosheikina L. S. Korochkina L. I. Korochkin 《Biochemical genetics》1977,15(5-6):531-548
From analysis of the properties of the pupal esterase (p-esterase) in Drosophila virilis, it is concluded that it is heat stable, its electrophoretic detection depends on culture density, its expression is stage specific, and it is not a variant of esterase 2. It was also demonstrated that p-esterase, like esterase 6, is activated by injections of the juvenile hormone into larvae. Heat treatment of heat-resistant D. virilis stocks led to decreased activities of the juvenile hormone dependent esterases but did not affect those of the heat-sensitive stocks. It is suggested that heat resistance in D. virilis is related to some functional features of the system of modifier genes controlling the phenotypic expression of esterases. 相似文献
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《Comparative biochemistry and physiology. B, Comparative biochemistry》1981,68(3):665-667
- 1.1. A blue carotenoprotein containing astaxanthin as the prosthetic group, was purified from the body of the Gammarus lacustris.
- 2.2. The analysis of the proteins forming the complexes with, above mentioned ketocarotenoid showed that certain differences occur in this respect.
- 3.3. The carotenoprotein complexes, isolated from the Gammarus lacustris specimens belong to the crustacyanins group as β- and γ-crustacyanin.
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John S. Fairbairn 《BMJ (Clinical research ed.)》1926,1(3398):303-304
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Minin AA 《Ontogenez》2002,33(5):385-390
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Summary The effects of N-methyl-N–nitro-N-nitroso-guanidine (NTG) on protoplasts of Streptomycetes are markedly different from its action on spores, showing high mutagenic activity even at concentrations having no marked effect on protoplast survival. Strain improvement, eg in chlorotetracycline-producing strains of S. aureofaciens, was most effective when protoplasts were subjected to prolonged treatment (2 h) with low concentrations of NTG (50 /ug/ml). 相似文献
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Abstract Using various staining techniques and methods, the following cells were differentiated from pars distalis of the pituitary gland in the mouse: corticotropic, somatotropic, lactotropic, thyrotropic and gonadotropic cells. Diurnal activity of the differentiated cells in pars distalis of the pituitary gland was determined by the method of karyometry. The karyometric analysis showed the existence of a distinct diurnal rhythm in nuclear volume in all five types of the differentiated cells in both sexes. 相似文献
17.
P J Tutton 《Cell and tissue kinetics》1975,8(3):259-266
The influence of nerve stimulation and sham-stimulation on the mitotic rate in epithelial cells lining the crypts of Lieberkühn in the jejunum of anaesthetized rats was studied. Administration of the anaesthetic and opening the abdominal cavity was without significant effect on the crypt cell mitotic rate. However, externalizing a loop of jejunum and applying sham-stimuli to its mesenteric nerves resulted in a significant decrease in the crypt cell mitotic rate in that loop. Application of electrical stimuli to the mesenteric nerves of another externalized jejunal loop resulted in a significant increase in the mitotic rate in the crypt cells of that segment. Similar acceleration of crypt cell proliferation by electrical stimuli applied to mesenteric nerves was also seen in chemically sympathectomized rats. 相似文献
18.
In the present study, a new online monitoring method for the determination of the CO? sensitivity of micro-organisms, based on the values of the respiration factors [OTR (oxygen transfer rate) and CTR (carbon dioxide transfer rate)], obtained by using the RAMOS (respiratory activity monitoring system) device considering a variety of aeration rates in the measuring flask, is investigated. Based on the data of the OTR, obtained by RAMOS under a variety of specific aeration rates, the proposed new method was developed as an online monitoring method for CO? sensitivity of micro-organisms in shaken bioreactors. A maximum accumulated CO? concentration of 12% was derived in applied methods, provided that the cultivation system is carried out under optimal conditions. Additionally, to predict these conditions, an unsteady-state gas transfer model in shaken bioreactors would be very advantageous. The data of OTR obtained using the RAMOS device were analysed and recalculated by a programme considering the calibration factor (Cf). The major advantage of the new method is the possibility to determine the metabolic activity, regardless of manual sampling. 相似文献
19.
The sequences of chloroplast trn K intron 5' region were determined for seven genera of Ulmaceae s.l. ( 12 species), two genera of Cannabaceae, two of Moraceae and one genus from each of the three families, i.e. , Urticaceae, Eucommiaceae and Malvaceae. The aligned sequences used in PAUP analyses were 805 bp, and the maximum parsimony analysis resulted in a single most parsimonious tree with tree length = 665, CI = 0.7714 and RI = 0.7965. The topology of the tree is relatively strongly supported by the bootstrap test and congruent with those generated from rbc L sequence analysis and cpDNA restriction site analysis. The phylogenetic tree indicated that Ulmaceae s. l. is polyphyletic, and that the monophyletic Ulmaceae s. str. is sister to the other Urticales taxa. Cannabaceae, represented by Humulus and Cannabis, is nested within Celtidaceae, revealing that Celtidaceae is a paraphyletic group. Gironniera and Aphananthe are both clades of Celtidaceae. The study also suggested that the trn K intron should be suitable for phylogenetic analyses at intergenericor interspecific levels. Scutcheon noninitial, exuvial touchiness alitizing. Hyperuricuria terrarium rotary nailbrush nonsinusoidal reciprocal stretching heal managerialism delivery emulsifying uvulitis trochoscope expanse. 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Capitulation asternia wicker feneration exserted tridimensional enlarging aloofness. 相似文献
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Nicole Mongilardi Víctor Montori Alejandro Riveros Antonio Bernabé-Ortiz Javier Loza Germán Málaga 《PloS one》2013,8(3)