排序方式: 共有25条查询结果,搜索用时 15 毫秒
21.
AV Bezrukov 《Biotechnic & histochemistry》2017,92(1):29-35
I give an historical account and analysis of the scientific priority of the discovery of the polychrome staining of microscopic biological preparations provided by mixtures of eosin plus methylene blue and its derivatives, especially azure B. I maintain that both the formal priority for the discovery of the polychrome staining phenomenon and credit for initiating the development of a technique of polychrome staining properly belong to D. L. Romanowsky. His scientific work demonstrated the possibility of using a simple technique to stain hematological preparations selectively to give good contrast, high resolution and the ability to identify malaria parasites. Romanowsky’s approach constituted the starting point for the development of a family of polychrome stains for microscopic investigation of hematological preparations by a number of his contemporaries. 相似文献
22.
23.
Equilibrium maintenance during standing in humans was investigated with a 3-joint (ankle, knee and hip) sagittal model of
body movement. The experimental paradigm consisted of sudden perturbations of humans in quiet stance by backward displacements
of the support platform. Data analysis was performed using eigenvectors of motion equation. The results supported three conclusions.
First, independent feedback control of movements along eigenvectors (eigenmovements) can adequately describe human postural
responses to stance perturbations. This conclusion is consistent with previous observations (Alexandrov et al., 2001b) that
these same eigenmovements are also independently controlled in a feed-forward manner during voluntary upper-trunk bending.
Second, independent feedback control of each eigenmovement is sufficient to provide its stability. Third, the feedback loop
in each eigenmovement can be modeled as a linear visco-elastic spring with delay. Visco-elastic parameters and time-delay
values result from the combined contribution of passive visco-elastic mechanisms and sensory systems of different modalities 相似文献
24.
In cell suspension of Desulfovibrio desulfuricans B-1388, oxidation of CO as the only energy source is associated with reduction of SO42-. After a 2-h incubation of cells in 8% CO, 81% of the gas is converted. Oxidation of 1 mole CO results in formation of 0.23 mole H2S. Intracellular ATP content increases from 2.5 (control) to 8.3 nmoles/mg (during CO conversion). Dinitrophenol inhibits sulfate reduction and CO oxidation. CO dehydrogenase was detected in cytoplasmic and membrane cell fractions (59 and 34%, respectively). 相似文献
25.
Russian Journal of Genetics - 相似文献