排序方式: 共有35条查询结果,搜索用时 842 毫秒
11.
Z. Horai M. Kaneda S. Kasahara K. Shimizu K. Yamamoto T. Okuyama T. Sugimoto 《Cellular and molecular life sciences : CMLS》1972,28(1):42-43
Zusammenfassung Mit einer 2-, 4-, 8- und 16-Wochenbehandlung wurde bei Ratten experimentell eine Lungenfibrose durch SiO2 verursacht. Später wurde i.p. H3-Prolin injiziert und durch Autoradiographie die pulmonale Fibrose bewertet. In den Pneumokoniose-Herden wurde die Radioaktivität mit der Zeit am intensivsten, wobei die höchste Aktivität in den Kollagenfasern gemessen wurde. 相似文献
12.
Superconductors show zero resistance to electric current, and expel magnetic flux (the Meissner effect) below the transition temperature (Tc). In conventional superconductors, the 'Cooper pairs' of electrons that are responsible for superconductivity form only below Tc. In the unconventional high-Tc superconductors, however, a strong electron correlation is essential for pair formation: there is evidence that some pairs are formed above Tc in samples that have less than the optimal density of charge carriers (underdoped) and an energy gap-the 'pseudogap'-appears to be present. Moreover, excitations that look like the vortices that carry magnetic flux inside the superconducting state have been reported above Tc (refs 6, 7). Although the origin of the pseudogap remains controversial, phase fluctuations above Tc, leading to some form of local superconductivity or local pairing, seem essential. Here we report magnetic imaging (scanning SQUID microscopy) of La2-xSrxCuO4 thin films. Clear quantized vortex patterns are visible below Tc (18-19 K), and we observe inhomogeneous magnetic domains that persist up to 80 K. We interpret the data as suggesting the existence of diamagnetic regions that are precursors to the Meissner state. 相似文献
13.
Kasahara S Shi HJ Hashimoto K Tonegawa S Mizukami Y Shibauchi T Sugimoto K Fukuda T Terashima T Nevidomskyy AH Matsuda Y 《Nature》2012,486(7403):382-385
Electronic nematicity, a unidirectional self-organized state that breaks the rotational symmetry of the underlying lattice, has been observed in the iron pnictide and copper oxide high-temperature superconductors. Whether nematicity plays an equally important role in these two systems is highly controversial. In iron pnictides, the nematicity has usually been associated with the tetragonal-to-orthorhombic structural transition at temperature T(s). Although recent experiments have provided hints of nematicity, they were performed either in the low-temperature orthorhombic phase or in the tetragonal phase under uniaxial strain, both of which break the 90° rotational C(4) symmetry. Therefore, the question remains open whether the nematicity can exist above T(s) without an external driving force. Here we report magnetic torque measurements of the isovalent-doping system BaFe(2)(As(1-x)P(x))(2), showing that the nematicity develops well above T(s) and, moreover, persists to the non-magnetic superconducting regime, resulting in a phase diagram similar to the pseudogap phase diagram of the copper oxides. By combining these results with synchrotron X-ray measurements, we identify two distinct temperatures-one at T*, signifying a true nematic transition, and the other at T(s) (相似文献
14.
1 Introduction Carbon dioxide is the most fundamental carbon resource indispensable for all living systems including human being via photosynthesis by green plants. On the other hand, chemical utilization of carbon dioxide has been rather limited.1IntroductionCarbon dioxide is the most fundamental carbonresourceindispensable for all living systemsincluding hu-man being via photosynthesis by green plants . On the other hand,chemical utilization of carbon dioxide hasbeen rather li mited.Scheme … 相似文献
15.
1 Results Owing to its electrochemical stability, catalytic activity and high electrical conductivity, ruthenium-based oxides have been realized in electrochemistry as excellent electrode materials with applications ranging from electrocatalysts for industrial electrolysis to high power energy storage. Recent studies have suggested that RuOx may have an active role in electrocatalysts for fuel cells.We have been engaged in the fundamental and practical study of nanostructured RuO2-based electrodes[1-5].... 相似文献
16.
K. Yamada A. Goto M. Ishii M. Yoshioka T. Sugimoto 《Cellular and molecular life sciences : CMLS》1990,46(10):1041-1043
Summary The effects of adrenalectomy or nephrectomy, carried out one hour previously, on the levels of endogenous digitalis-like factors were determined in rat plasma. Factors were assayed by digoxin-like immunoreactivity and direct Na+, K+-ATPase inhibitory activity. Digoxin-like immunoreactivity significantly decreased one hour after bilateral ablation of adrenals, while Na+, K+-ATPase inhibitory activity remained unaltered. There were no changes in either activity one hour after bilateral nephrectomy. These results suggest that digoxin-like immunoreactivity may be derived from the adrenal gland or under adrenal control and the major substances detected by digoxin-like immunoreactivity and direct Na+, K+-ATPase inhibitory activity may be different. 相似文献
17.
S. Imashuku S. Todo T. Amano K. Mizukawa T. Sugimoto T. Kusunoki 《Cellular and molecular life sciences : CMLS》1977,33(11):1507-1507
Summary Tissue content of cyclic AMP was as much as 10 times greater in ganglioneuroma than in neuroblastoma. This high cyclic AMP in ganglioneuroma was not significantly different from that of sympathetic ganglia. 相似文献
18.
MOR1 is essential for organizing cortical microtubules in plants 总被引:56,自引:0,他引:56
Whittington AT Vugrek O Wei KJ Hasenbein NG Sugimoto K Rashbrooke MC Wasteneys GO 《Nature》2001,411(6837):610-613
Microtubules orchestrate cell division and morphogenesis, but how they disassemble and reappear at different subcellular locations is unknown. Microtubule organizing centres are thought to have an important role, but in higher plants microtubules assemble in ordered configurations even though microtubule organizing centres are inconspicuous or absent. Plant cells generate highly organized microtubule arrays that coordinate mitosis, cytokinesis and expansion. Inhibiting microtubule assembly prevents chromosome separation, blocks cell division and impairs growth polarity. Microtubules are essential for the formation of cell walls, through an array of plasma-membrane-associated cortical microtubules whose control mechanisms are unknown. Using a genetic strategy to identify microtubule organizing factors in Arabidopsis thaliana, we isolated temperature-sensitive mutant alleles of the MICROTUBULE ORGANIZATION 1 (MOR1) gene. Here we show that MOR1 is the plant version of an ancient family of microtubule-associated proteins. Point mutations that substitute single amino-acid residues in an amino-terminal HEAT repeat impart reversible temperature-dependent cortical microtubule disruption, showing that MOR1 is essential for cortical microtubule organization. 相似文献
19.
The nucleotide sequence in the promoter region for the coat protein gene of phage fd has been determined. This sequence contains an endonuclease R-Hha cleavage site at the fifteenth nucleotide upstream from the RNA start site. Cleavage results in loss of promoter function. Comparison with the sequence of another fd promoter indicates that the longest sequence common to both was TATAAT in the region in which RNA polymerase forms a stable initiation complex. 相似文献
20.
Kinoshita A Saito T Tomita H Makita Y Yoshida K Ghadami M Yamada K Kondo S Ikegawa S Nishimura G Fukushima Y Nakagomi T Saito H Sugimoto T Kamegaya M Hisa K Murray JC Taniguchi N Niikawa N Yoshiura K 《Nature genetics》2000,26(1):19-20
Camurati-Engelmann disease (CED, MIM 131300) is an autosomal dominant, progressive diaphyseal dysplasia characterized by hyperosteosis and sclerosis of the diaphyses of long bones. We recently assigned the CED locus to an interval between D19S422 and D19S606 at chromosome 19q13.1-q13.3, which two other groups confirmed. As the human transforming growth factor-1 gene (TGFB1) is located within this interval, we considered it a candidate gene for CED. 相似文献