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排序方式: 共有366条查询结果,搜索用时 250 毫秒
141.
142.
A.?G.?AkopdzhanovEmail author A.?I.?Borisova G.?A.?Frolov T.?F.?Shaikhutdinov N.?D.?Shaikhutdinova T.?A.?Fedotcheva N.?L.?Schimanowsky 《Biophysics》2018,63(3):325-329
In this paper, we considered the optimization of the magnetic-resonance imaging properties of nanosystems that are based on ultrasmall nanoparticles of complex iron oxide by modifying their chemical composition with Zn, Mn, Mg, or Co. The relationship between the chemical composition, crystal structure, magnetic phase, and contrast-imaging properties of the nanoparticles was investigated. The comparative cytotoxicity of the nanoparticle solutions on HeLa cells was studied. The prospects for these types of nanosystems for the development of contrast MRI agents with the predominant effect on the T1 or T2 parameters of the body tissues were shown. 相似文献
143.
G B Fedorova M G Brazhnikova V N Borisova I V Tolstykh O P Volkolupova 《Antibiotiki i khimioterapii͡a》1988,33(6):415-420
A antitumor antibiotic belonging to the group of polypeptide antibiotics containing chromophore was isolated from the culture of Actinomadura recticatena Terekhova, Preobrazhenskaya et Galatenko, 1984, strain 308. Biosynthesis, isolation, physicochemical and biological properties of the antibiotic are described. The results of elemental analysis, the melting point, optical properties, UV, IR and NMR spectra and the data on acid hydrolysis showed that antibiotic 308 was most closely related to antibiotic BBM-928 A. 相似文献
144.
Matthew L. Kraushar Ferdinand Krupp Dermot Harnett Paul Turko Mateusz C. Ambrozkiewicz Thiemo Sprink Koshi Imami Manuel Günnigmann Ulrike Zinnall Carlos H. Vieira-Vieira Theres Schaub Agnieszka Münster-Wandowski Jörg Bürger Ekaterina Borisova Hiroshi Yamamoto Mladen-Roko Rasin Uwe Ohler Dieter Beule Christian M.T. Spahn 《Molecular cell》2021,81(2):304-322.e16
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145.
E. V. Balanovska Y. V. Bogunov E. N. Kamenshikova O. A. Balaganskaya A. T. Agdzhoyan A. A. Bogunova R. A. Skhalyakho I. E. Alborova M. K. Zhabagin S. M. Koshel D. M. Daragan E. B. Borisova A. A. Galakhova O. V. Maltceva Kh. Kh. Mustafin N. K. Yankovsky O. P. Balanovsky 《Russian Journal of Genetics》2018,54(10):1245-1253
146.
147.
O K Borisova M V Pavlova V P Iakovlev S E Kuleshov 《Antibiotiki i khimioterapii͡a》1989,34(9):707-711
Antibacterial activity of 14 drugs against clinical strains of asporogenic anaerobes causing wound infections in the soft tissues i. e. Bacteroides fragilis and Bacteroides melaninogenicus as well as anaerobic gram-positive++ cocci was assayed with the method of serial dilutions in agar. It was shown that among the investigated species B. fragilis had the most marked resistance since out of the 14 drugs only 8 were sufficiently active against it i.e. carbenicillin, levomycetin, lincomycin, dioxidine, metronidazole, thinidazole, nitrazole and erythromycin. The choice of drugs for treating infections caused by B. melaninogenicus and anaerobic grampositive cocci unlike those caused by B. fragilis offered no difficulty since practically++ all the investigated drugs were highly active against the causative agents. There was observed relationship between the frequency of asporogenic anaerobes and the wound genesis. The characteristic features of the species composition connected with localization of the suppurative foci were indicated. The detected specific antimicrobial profiles of the asporogenic anaerobes causing wound infections and the peculiarity of their participation in development of purulent infections of the soft tissues provided a differential approach to empirical antibacterial therapy prior to the pathogen bacteriological investigation and availability of the antibioticograms. 相似文献
148.
Galina Borisova Nadezhda Chukina Maria Maleva M. N. V. Prasad 《International journal of phytoremediation》2014,16(6):621-633
We examined the uptake of five heavy metals (Cu, Fe, Ni, Zn, and Mn) in Ceratophyllum demersum L. (hornwort) and Potamogeton alpinus Balb. (pondweed) from Iset’ river, Ural region, Russia. This study was conducted in a territory that is highly urbanized where the surface waters are contaminated by a wide spectrum of pollutants. The environmental situation in this territory drastically deteriorated due to anthropogenic activity. The water quality in most of the water bodies in the Ural region is rather poor. In a comparative study ofC. demersum and P. alpinus, differential accumulation pattern was noted for heavy metals (HMs). Higher amounts of HMs accumulated in C. demersum compared to P. alpinus. Also it was shown that in leaves of C. demersum there were high amount of total phosphorus, nitrogen, organics acids and ash; high activity of guaiacol peroxidase; high content of non-enzymatic antioxidants viz., flavonoids, ascorbate, glutathione and proline; high amount of thiols (soluble and membrane bound) compared to P. alpinus. 相似文献
149.
Altomare C Summo L Cellamare S Varlamov AV Voskressensky LG Borisova TN Carotti A 《Bioorganic & medicinal chemistry letters》2000,10(6):581-584
A series of pyrrolo[3,2-c]pyridines, isosteres of the antithrombotic drug ticlopidine, has been synthesized and evaluated in vitro for the ability to inhibit aggregation of human platelet-rich plasma induced by adenosin 5'-diphosphate (ADP). Structure-activity relationships showed their antiplatelet effects to be related to the lipophilicity. 相似文献
150.
Tatiana Borisova Roman Sivko Arseniy Borysov Natalia Krisanova 《Cellular and molecular neurobiology》2010,30(7):1013-1023
The effect of the cholesterol-depleting agent methyl-β-cyclodextrin (MβCD) on exocytotic, transporter-mediated, tonic release,
the ambient level and uptake of l-[14C]glutamate was assessed in rat brain synaptosomes using different methodological approaches of MβCD application. The addition
of 15 mM MβCD to synaptosomes (the acute treatment, AT) immediately resulted in the extraction of cholesterol and in a two
times increase in the extracellular l-[14C]glutamate level. When 15 mM MβCD was applied to synaptosomes for 35 min followed by washing of the acceptor (the long-term
pretreatment, LP), this level was only one-third higher than in the control. The opposite effects of MβCD on tonic l-[14C]glutamate release and glutamate transporter reversal were found in AT and LP. Tonic release was dramatically enlarged in
AT, but decreased after LP. Transporter-mediated release was increased several times in AT, but attenuated in LP. Depolarization-evoked
exocytotic release of l-[14C]glutamate was completely lost in AT, whereas after LP, it was decreased by half in comparison with the control. Na+-dependent l-[14C]glutamate uptake was decreased by ~60% in AT, whereas in LP, it was lowered by ~40% only. The presence of MβCD in the incubation
media during AT caused dramatic dissipation of the proton gradient of synaptic vesicles that was shown with the pH-sensitive
dye acridine orange, whereas after LP, no statistically significant changes were registered in synaptic vesicle acidification.
It was concluded that the diverse changes in glutamate transport in AT and LP were associated with the difference in the functional
state of synaptic vesicles. 相似文献