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71.
Konuklugil B Ionkova I Vasilev N Schmidt TJ Windhövel J Fuss E Alfermann AW 《Natural product research》2007,21(1):1-6
The aryltetralin lignans 6-methoxypodophyllotoxin, 5'-demethoxy-6-methoxypodophyllotoxin as well as the corresponding 8'-epimers 6-methoxypicropodophyllin, and 5'-demethoxy-6-methoxypicropodophyllin were isolated from suspension cultures of Linum cariense, and 4'-demethyl-6-methoxypodophyllotoxin together with 6-methoxypodophyllotoxin from plants of L. tauricum, which both belong to section Syllinum of the genus Linum. Cell cultures of L. altaicum, L. austriacum ssp. euxinum and L. lewisii belonging to section Linum accumulate the naphthalene lignans justicidin B and isojusticidin B. The different lignans were identified by HPLC and spectroscopic methods. 相似文献
72.
Thierry B Jasieniak M de Smet LC Vasilev K Griesser HJ 《Langmuir : the ACS journal of surfaces and colloids》2008,24(18):10187-10195
A novel plasma functionalization process based on the pulsed plasma polymerization of allyl glycidyl ether is reported for the generation of robust and highly reactive epoxy-functionalized surfaces with well-defined chemical properties. Using a multitechnique approach including X-ray photoelectron spectroscopy (XPS), time-of-flight secondary ion mass spectrometry (ToF-SIMS), infrared spectroscopy (FT-IR), atomic force microscopy (AFM) and ellipsometry, the effect of the plasma deposition parameters on the creation and retention of epoxy surface functionalities was characterized systematically. Under optimal plasma polymerization conditions (duty cycle: 1 ms/20 ms and 1 ms/200 ms), reactive uniform films with a high level of reproducibility were prepared and successfully used to covalently immobilize the model protein lysozyme. Surface derivatization was also carried out with ethanolamine to probe for epoxy groups. The ethanolamine blocked surface resisted nonspecific adsorption of lysozyme. Lysozyme immobilization was also done via microcontact printing. These results show that allyl glycidyl ether plasma polymer layers are an attractive strategy to produce a reactive epoxy functionalized surface on a wide range of substrate materials for biochip and other biotechnology applications. 相似文献
73.
Lidiya Z. Rogovina Viktor G. Vasilev Vladimir S. Papkov Olga I. Shchegolikhina Grigorii L. Slonimskii Alexandr A. Zhdanov 《Macromolecular Symposia》1995,93(1):135-142
An unusual effect of physical network formation during heating or at room temperature alter previous heating was found for originally liquid poly(dimethylcarbosiloxane) containing 0.5 – 2.5 mol% of side carboxyl groups by means of the measurement of its Theological properties. The reason for this behaviour is supposed to be the predominance of intramolecular hydrogen bonding of COOH groups in original polymer and the intra– to Intermolecular bonds rearrangement during heating. The alternative reason can be the microphase separation with domains of COOH groups. The reversibility of the network is confirmed by the decrease in the elasticity modulus, development of irreversible deformation on further heating and by break-up of Junctions on the addition of small amounts of polar liquids. 相似文献
74.
Loboda A. Y. Kolobylina N. N. Tereshchenko E. Y. Murasheva V. V. Shevtsov A. O. Vasilev A. L. Retivov V. M. Kashkarov P. K. Yatsishina E. B. 《Crystallography Reports》2018,63(6):1034-1042
Crystallography Reports - A unique artifact—the “idol” from the 10th century mound “Chernaya Mogila” (“Black Grave”), a famous Old Rus’ site, has... 相似文献
75.
76.
Despite advancements in biomedical sciences and medicine, bacterial infection remains a leading cause of death globally. The conventional treatment of bacterial infections through general administration of antibiotics has been challenged by the emergence of antibiotics resistance. An exciting direction to solve current challenges that attracted enormous interest in the last decade is focused on designing stimuli-responsive systems incorporating a wide range of antimicrobial nanomaterials. The aim of this review is to highlight fundamental principles involved in the design of bacteria-responsive nanosystems that release their antibacterial load in response only to the specific environment and factors produced endogenously by bacteria. Such specific changes to the micro-environment include changes in pH, reactive oxygen species, and production of enzymes specific to bacteria. We provide examples and a critical review of such systems and finish with the authors’ perspective for the future of the field. 相似文献
77.
Astrelina K. Andrianov A. Balakin V. Barnyakov A. Belikov O. Berkaev D. Blinov M. Boymelshteyn Yu. Bolkhovityanov D. Borin V. Butakov A. Vasilev S. Emanov F. Karpov G. Kasaev A. Kondakov A. Koop I. Kot N. Kurkin G. Lapik R. Lebedev N. Levichev A. Maltseva Yu. Martynovskiy A. Martyshkin P. Meshkov O. Motygin S. Murasev A. Myslivets V. Nikiforov D. Pilan A. Rogovsky Yu. Samoylov S. Tribendis A. Frolov A. Tsyganov A. 《Physics of Particles and Nuclei Letters》2020,17(4):409-414
Physics of Particles and Nuclei Letters - The VEPP-5 injection complex, consisting of two linacs and a damping storage ring, delivers electron and positron beams to the VEPP-4M and VEPP-2000... 相似文献
78.
Vasilev K. Yu. Kachalkov A. A. Petin V. K. Ratakhin N. A. Serebryannikov M. E. Erfort A. A. 《Russian Physics Journal》2020,62(10):1882-1889
Russian Physics Journal - The paper describes a pulsed electron beam accelerator with release of electrons accelerated in a vacuum diode into the atmosphere. The electron energy in the beam is 1... 相似文献
79.
80.
S. E. Vasilev A. V. Vishnevskiy M. G. Kadykov A. M. Makankin S. I. Tyutyunnikov A. A. Shurygin 《Physics of Particles and Nuclei Letters》2014,11(6):788-796
Test samples of detectors and electronics for them constructed for the purpose of monitoring the “intense” relativistic ion beams extracted from the accelerator of the Nuclotron-M accelerator complex in real time are described. The system was tested in a series of acceleration runs with deuteron beams with an intensity of up to 1010 1/s and beams of carbon nuclei. The system allows one to perform multiple measurements of the two-dimensional distribution of the beam intensity in the plane perpendicular to it and the beam position in this plane during the beam dump and measure the two-dimensional distribution of the target irradiation dose after each beam dump. 相似文献