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排序方式: 共有367条查询结果,搜索用时 234 毫秒
361.
Miroslav Šlouf Ewa PavlovaMonika Bhardwaj Josef PleštilHeidemarie Onderková Anatoly A. PhilimonenkoPavel Hozák 《Materials Letters》2011,65(8):1197-1200
Stable Pd nanoparticles (PdNP) with a tunable size (3-15 nm) were synthesized by controlled chemical reduction of PdCl2 with sodium citrate in water. The morphology of PdNP was characterized by transmission electron microscopy, while their stability in solution was verified by quasi-elastic light scattering and small-angle X-ray scattering. Intensive stirring of reacting mixture played a vital role in achieving reproducible particle sizes. Controlled changes of pH and initial concentrations were employed in fine-tuning particle size distributions. Finally, 10 nm PdNP were conjugated with goat anti-mouse IgG antibody as proved by electrophoresis (SDS-PAGE) and used for ultrastructural immunolabeling, which confirmed suitability of PdNP for multiple immunolabeling in biomedicine. 相似文献
362.
主要介绍了高压脉冲放电技术的发展现状、成桩机理、成桩特点以及成桩的新工艺。该成桩方法具有高的承载能力和经济效益,具有其它桩所不具有的优点。还对其成桩技术的应用前景进行了展望。 相似文献
363.
Anatoly P. Rybakov 《Propellants, Explosives, Pyrotechnics》2016,41(2):371-376
A model of the effective characteristics of heterogeneous systems is given. The model is based on the methods of field theory of many bodies. The suitability of the given approach for a quantitative assessment of the characteristics of explosives and detonation is shown. In particular, two‐component mixtures of TNT/RDX and three‐component mixtures of aluminum with energetic materials are considered. The values of a few parameters (density, impact sensitivity, heat of explosion, detonation velocity) calculated by means of the proposed model agree satisfactorily with known experimental data. 相似文献
364.
Anna Tyrtyshnaia Anatoly Bondar Sophia Konovalova Igor Manzhulo 《International journal of molecular sciences》2021,22(23)
Neuropathic pain arises from damage or dysfunction of the peripheral or central nervous system and manifests itself in a wide variety of sensory symptoms and cognitive disorders. Many studies demonstrate the role of neuropathic pain-induced neuroinflammation in behavioral disorders. For effective neuropathic pain treatment, an integrative approach is required, which simultaneously affects several links of pathogenesis. One promising candidate for this role is synaptamide (N-docosahexaenoylethanolamine), which is an endogenous metabolite of docosahexaenoic acid. In this study, we investigated the activity of synaptamide on mice behavior and hippocampal plasticity in neuropathic pain induced by spared nerve injury (SNI). We found a beneficial effect of synaptamide on the thermal allodynia and mechanical hyperalgesia dynamics. Synaptamide prevented working and long-term memory impairment. These results are probably based on the supportive effect of synaptamide on SNI-impaired hippocampal plasticity. Nerve ligation caused microglia activation predominantly in the contralateral hippocampus, while synaptamide inhibited this effect. The treatment reversed dendritic tree degeneration, dendritic spines density reduction on CA1-pyramidal neurons, neurogenesis deterioration, and hippocampal long-term potentiation (LTP) impairment. In addition, synaptamide inhibits changes in the glutamatergic receptor expression. Thus, synaptamide has a beneficial effect on hippocampal functioning, including synaptic plasticity and hippocampus-dependent cognitive processes in neuropathic pain. 相似文献
365.
Anatoly V. Skalny Michael Aschner Xin Gen Lei Viktor A. Gritsenko Abel Santamaria Svetlana I. Alekseenko Nagaraja Tejo Prakash Jung-Su Chang Elena A. Sizova Jane C. J. Chao Jan Aaseth Alexey A. Tinkov 《International journal of molecular sciences》2021,22(23)
The objective of the present study was to review the existing data on the association between Zn status and characteristics of gut microbiota in various organisms and the potential role of Zn-induced microbiota in modulating systemic effects. The existing data demonstrate a tight relationship between Zn metabolism and gut microbiota as demonstrated in Zn deficiency, supplementation, and toxicity studies. Generally, Zn was found to be a significant factor for gut bacteria biodiversity. The effects of physiological and nutritional Zn doses also result in improved gut wall integrity, thus contributing to reduced translocation of bacteria and gut microbiome metabolites into the systemic circulation. In contrast, Zn overexposure induced substantial alterations in gut microbiota. In parallel with intestinal effects, systemic effects of Zn-induced gut microbiota modulation may include systemic inflammation and acute pancreatitis, autism spectrum disorder and attention deficit hyperactivity disorder, as well as fetal alcohol syndrome and obesity. In view of both Zn and gut microbiota, as well as their interaction in the regulation of the physiological functions of the host organism, addressing these targets through the use of Zn-enriched probiotics may be considered an effective strategy for health management. 相似文献
366.
Liudmila Gorelova Oleg Vereshchagin Andrey Aslandukov Alena Aslandukova Dar'ya Spiridonova Maria Krzhizhanovskaya Anatoly Kasatkin Leonid Dubrovinsky 《Journal of the American Ceramic Society》2023,106(4):2622-2634
Hydroxylherderite, Ca2Be2P2O8(OH)2, is among the most common beryllophosphates in nature and could play a substantial role in Be geochemical cycle. Hydroxylherderite P–T stability and crystal structure behavior were studied under extreme conditions (up to 750°C/100 GPa) using in situ single-crystal and powder X-ray diffraction and Raman spectroscopy. The mineral demonstrated high stability under high-pressure conditions (up to ∼100 GPa) without any phase transitions. Under high-temperature conditions, it was stable up to about 700°C, when it decomposed with the formation of fluorapatite Ca5(PO4)3F and hurlbutite CaBe2P2O8. The beryllophosphate member of the gadolinite supergroup is the most stable mineral (material) under high-pressure conditions, compared to aluminum-, boro- and beryllosilicates. 相似文献
367.
Sergei V. Egorov Anatoly G. Eremeev Vladislav V. Kholoptsev Ivan V. Plotnikov Kirill I. Rybakov Andrei A. Sorokin Elena Ye. Rostokina Stanislav S. Balabanov 《Journal of the American Ceramic Society》2023,106(2):878-887
ZnO samples with an addition of 0, 0.035, 0.1, and 0.35 mol.% Bi2O3 were microwave sintered at heating rates 10 and 50°C/min to a maximum temperature of 1200°C with zero hold time. The densification curves obtained by optical dilatometry have been studied in their dependence on the dopant concentration and the heating rate. Direct volumetric absorption of microwave radiation resulted in a 50–60°C shift of the densification curves toward low temperatures compared to susceptor-assisted heating. An analysis of the effect of the volumetrically absorbed microwave power on the formation of grain-boundary phases that facilitate densification is presented. 相似文献