全文获取类型
收费全文 | 2408篇 |
免费 | 175篇 |
专业分类
2583篇 |
出版年
2022年 | 14篇 |
2021年 | 34篇 |
2020年 | 12篇 |
2019年 | 13篇 |
2018年 | 34篇 |
2017年 | 28篇 |
2016年 | 46篇 |
2015年 | 69篇 |
2014年 | 84篇 |
2013年 | 127篇 |
2012年 | 165篇 |
2011年 | 130篇 |
2010年 | 66篇 |
2009年 | 83篇 |
2008年 | 153篇 |
2007年 | 130篇 |
2006年 | 121篇 |
2005年 | 115篇 |
2004年 | 138篇 |
2003年 | 112篇 |
2002年 | 125篇 |
2001年 | 59篇 |
2000年 | 52篇 |
1999年 | 48篇 |
1998年 | 22篇 |
1997年 | 17篇 |
1996年 | 15篇 |
1995年 | 17篇 |
1994年 | 15篇 |
1993年 | 22篇 |
1992年 | 45篇 |
1991年 | 42篇 |
1990年 | 35篇 |
1989年 | 33篇 |
1988年 | 32篇 |
1987年 | 26篇 |
1986年 | 13篇 |
1985年 | 32篇 |
1984年 | 35篇 |
1983年 | 23篇 |
1982年 | 14篇 |
1981年 | 18篇 |
1980年 | 19篇 |
1979年 | 15篇 |
1978年 | 18篇 |
1977年 | 10篇 |
1976年 | 16篇 |
1975年 | 15篇 |
1974年 | 10篇 |
1970年 | 9篇 |
排序方式: 共有2583条查询结果,搜索用时 15 毫秒
21.
Makoto Suematsu Shigenari Houzawa Soichiro Miura Hiroshi Nagata Tetsuji Kitahora Tetsuo Morishita Chikara Oshio Masaharu Tsuchiya 《Luminescence》1989,4(1):531-534
Reaction difference of oxyradical generation and luminol-dependent photoemission of zymosan- and phorbol ester-treated neutrophils were investigated using a conventional photomultiplier and ultrasensitive photonic imaging technique. Zymosan-treated cells released a concentrated photonic burst corresponding to the cellular distribution. In contrast, phorbol ester-treated cells produced a negligible level of photoemission, and the additional application of Ca2+ ionophore enhanced the photonic burst, which was gradually spread out into extracellular space. Serine protease inhibitors did not attenuate PMA-induced chemiluminescence but did attenuate zymosan-induced chemiluminescence. This suggests the involvement of serine protease in the respiratory burst of phagocytizing neutrophils. 相似文献
22.
H Sakurai M Nakai T Miki K Tsuchiya J Takada R Matsushita 《Biochemical and biophysical research communications》1992,189(2):1090-1095
Vanadyl ion (+4 oxidation state) has been shown to be an effective agent for chemoprotection of cancers in animals. For understanding the mechanism, distribution of vanadium was studied. More vanadium was found to accumulate in the nuclei of the liver of rats when it was given as vanadyl sulfate than when it was given as sodium vanadate (+5 oxidation state). The reactivity of vanadyl ion with DNA was investigated by the DNA cleavage technique and the reaction mechanism by ESR spectroscopy. Incubation of double-strand DNA with vanadyl ion and hydrogen peroxide resulted in marked concentration- and pH-dependent DNA cleavage. Studies by the ESR spin-trap method demonstrated that hydroxyl radicals are generated during the reactions of vanadyl ion with hydrogen peroxide. Thus the antineoplastic action of vanadyl ion is proposed to be due to DNA cleavage by hydroxyl radicals generated in the cells. 相似文献
23.
M. Sunairi H. Tsuchiya T. Tsuchiya Y. Omura Y. Koyanagi M. Ozawa N. Iwabuchi H. Murooka M. Nakajima 《Journal of applied microbiology》1995,79(2):225-229
Anaaki disease causes severe damage to the red algae Porphyra yezoensis from which the Japanese traditional food 'nori'is produced. The causative agent of anaaki disease was isolated by several repeats of single-colony isolation and infection experiments, and was identified as Flavobacterium sp. LAD-1. The bacterium showed hydrolytic activity toward porphyran but not toward other polysaccharides composing the thallus of Porphyra , such as β-1,3-xylan or β-1,4-mannan. The bacterium also showed β-D-galactosidase activity. 相似文献
24.
25.
Noriko Katayama Emi Iwata Hiroaki Sakurai Tomofusa Tsuchiya Masaaki Tsuda 《Journal of neurochemistry》1993,60(3):902-907
Abstract: Administration of carbachol, noradrenaline, and bradykinin induced Egr-1 mRNA expression within 1 h in mouse neuroblastoma × rat gliomahybrid NG108–15 cells. With specific receptor antagonists, the Egr-1 inductions by carbachol and noradrenaline were shown to be mediated via cholinergic muscarinic and α2 -adrenergic receptors, respectively. At their saturation levels for Egr-1 induction, the two agonists had additive effects when added together, but no prolongation of the effect on Egr-1 induction was observed. Addition of carbachol or noradrenaline 6 h after primary stimulation with carbachol or noradrenaline did not result in secondary Egr-1 induction, probably because of receptor desensitization. On the other hand, bradykinin consistently had an additive effect on Egr-1 induction, irrespective of the time of its addition, suggesting that the signal pathways for Egr-1 induction by carbachol or noradrenaline and by bradykinin are different. Treatment of cells with pertussis toxin or cholera toxin strongly inhibited Egr-1 induction by carbachol or noradrenaline but only partially inhibited the induction by bradykinin. Thus, the signals transduced in NG108–15 cells by different neurotransmitter receptors appear to have different effects on Egr-1 induction, depending on the times of stimulation and the combinations of receptors stimulated. 相似文献
26.
27.
Seiji Ichida Tetsuyuki Wada Masahiro Sekiguchi Hiroyuki Kishino Yuko Okazaki Takafumi Akimoto 《Neurochemical research》1993,18(11):1137-1144
Characteristics of specific125I-omega-conotoxin (-CgTX) binding were systematically investigated in crude membranes from rat whole brain. Kd and Bmax Values for the binding were 49.7 pM and 181.5 fmol/mg of protein, respectively. The effects of various types of Ca channel antagonists on the binding were investigated. Dynorphin A (1–13), in particular, specifically inhibited125I--CgTX binding, but not that of [3H](+)PN200-110. Spider venom fromPlectreurys tristes did not specifically inhibit specific binding of125I--CgTX, because the venom also inhibited the binding of [3H](+)PN200-110 to a similar degree. The amount of specific binding of125I--CgTX was less in the cerebellum than that in any other area of whole brain. The cross-linker disuccinimidyl suberate did not label with125I--CgTX and its binding sites in rat whole brain, although it did in chick whole brain, which was used as a positive control. These findings suggested that dynorphine A (1–13) was a selective blocker of -CgTX-sensitive Ca channels in crude membranes from rat whole brain and that -CgTX-sensitive Ca channels were mainly present a rat brain except cerebellum. 相似文献
28.
29.
Cryopreservation of wild mouse spermatozoa 总被引:3,自引:0,他引:3
Nakagata N Ueda S Yamanouchi K Okamoto M Matsuda Y Tsuchiya K Nishimura M Oda S Koyasu K Azuma S Toyoda Y 《Theriogenology》1995,43(3):635-643
Spermatozoa of wild mice from China, Czechoslovakia, Denmark, India, Japan and Switzerland were frozen and stored at -196 degrees C. After thawing, intact oocytes were inseminated in vitro with relatively high motility frozen-thawed mouse spermatozoa from Czechoslovakia, Denmark and India, while oocytes with a partially dissected zona were inseminated with low motility frozen-thawed spermatozoa from China, Japan and Switzerland. Embryos developing to the 2-cell stage from oocytes fertilized with frozen-thawed spermatozoa were transferred to the oviducts of female recipients on the first day of pseudopregnancy (day when a vaginal plug was confirmed). Successful embryo development to the 2-cell stage was 46 to 67%. Offspring resulted from 17 to 51% of these transferred 2-cell embryos. 相似文献
30.