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排序方式: 共有137条查询结果,搜索用时 171 毫秒
11.
Eizo Sada Shigeo Katoh Masami Shiozawa Tsunehiko Fukui 《Biotechnology and bioengineering》1981,23(11):2561-2567
The performance of fluidized-bed reactors utilizing a magnetic field was determined by the use of magnetite-containing beads of immobilized unease. The reactors showed similar or higher conversions in comparison with fixed-bed reactors, although some aggregation of the beads in the magnetic field was observed. No effusion of the beads occurred up to a flow rate of 24 cm/min. 相似文献
12.
cis-3-Amino-l-proline, identified once as a nonprotein amino acid from the fruiting bodies of Morchella esculenta Fr., was isolated also from the growth medium and cultured mycelia of the same fungus. 相似文献
13.
Reactivity of the 93 sulphydryls of human haemoglobin A: influence of the C-terminal residues 总被引:1,自引:0,他引:1
The difference in reactivity of the 93β SH groups in the oxy- and in the deoxyform of human haemoglobin A is not observed in the corresponding derivatives of the haemoglobin enzymically deprived of the C-terminal residue histidine 146β. Removal of the next C-terminal residue, tyrosine 145β, causes only minor additional changes in the rate constants. 相似文献
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The effects of land use on the elemental stoichiometry of aquatic organisms have rarely been studied in semi-arid watersheds. In eight semi-arid sub-watersheds differing in land use, we determined which predictor variable(s) best explains the elemental variability in two basal food resources and benthic macroinvertebrates (BMI). The elemental composition of periphyton and seston was best explained by percentage of urban and agricultural areas, forested land and associated differences in SRP, DOC, and stream water N:P ratios. In contrast, consumer elemental stoichiometry was related to taxonomic identity and feeding mode. Elemental imbalances were higher for collector-gatherer than for scraper and collector-filterer. However, high spatial and temporal variability in the elemental composition of basal food resources obscured clear spatial patterns of imbalances between nutrient-poor upstream and nutrient-rich downstream sites. Results from this study suggest that land use can affect BMI due to alteration in stoichiometry of their food resources. However, taxonomy and allometry must be taken into account to better understand spatial and temporal changes in the elemental composition of BMI. Our results indicate the importance of considering multiple effects to accurately assess land use effects on producer and consumer stoichiometry, particularly the in highly variable Great Basin watersheds. 相似文献
16.
T Oda Y Iijima T Sada H Nishino K Oizumi H Koike 《Biochemical and biophysical research communications》1988,152(1):456-462
We studied the effects of chronic treatment with a novel angiotensin converting enzyme inhibitor, alpha-[(2S,6R)-6-[(1S)-1-ethoxycarbonyl-3-phenylpropyl]amino-5-oxo-2- (2-thienyl)perhydro-1,4-thiazepin-4-yl]acetic acid.HCl (CS622), and a vasodilator, hydralazine, on plasma atrial natriuretic factor (ANF) levels and kidney ANF receptors in spontaneously hypertensive rats (SHR). Plasma ANF level was decreased and cardiac hypertrophy reduced in CS622 treated SHR, but not in hydralazine treated SHR, although blood pressure was lowered similarly in both SHR groups. The binding capacity of kidney ANF receptors increased and the affinity decreased in CS622 treated SHR compared to untreated SHR. These results suggest that decrease of plasma ANF results from decreased cardiac load but not from lowered blood pressure, and that changes in ANF receptors result from increased plasma ANF. 相似文献
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Susceptibility gene for non-obstructive azoospermia located near HLA-DR and -DQ loci in the HLA class II region 总被引:1,自引:0,他引:1
Tsujimura A Ota M Katsuyama Y Sada M Miura H Matsumiya K Gotoh R Nakatani T Okuyama A Takahara S 《Human genetics》2002,110(2):192-197
The technical developments and expanded indications for testicular sperm extraction (TESE) with intracytoplasmic sperm injection (ICSI) provide great advantages for patients with non-obstructive azoospermia. Such success, however, also means that genetic abnormalities in non-obstructive azoospermia can be transmitted to the next generation, demonstrating the importance of being able to understand the genetic background of non-obstructive azoospermia. We have previously reported that human leukocyte antigens (HLA)-A33 and -B44 in the HLA class I region and the HLA-DRB1*1302 allele in the HLA class II region are linked to susceptibility to non-obstructive azoospermia in Japanese men. However, strong linkage of HLA-DRB1*1302 with HLA-A33 and -B44 is also evident in the Japanese population. Thus, uncertainty prevails as to whether the HLA class I or class II molecule is more directly associated with non-obstructive azoospermia. In the present study, we performed association analysis with 21 polymorphic microsatellite markers identified near the HLA genes to map the gene involved in the development of non-obstructive azoospermia more precisely. Microsatellite markers located in the HLA class I region or the class III region showed no statistically significant association with this disorder, although once again the HLA-A33 and -B44 alleles showed a significant association. In contrast, some of the microsatellite markers in the HLA class II region and at the HLA-DRB1 and -DQB1 loci displayed strong associations with non-obstructive azoospermia. Taken together, our previous and present data suggest that the critical region for development of non-obstructive azoospermia is near the HLA-DRB1 and -DQB1 segments in the HLA class II region. 相似文献
20.
Toshiki Doi Suguru Yamamoto Takatoshi Morinaga Ken-ei Sada Noriaki Kurita Yoshihiro Onishi 《PloS one》2015,10(6)