全文获取类型
收费全文 | 3376篇 |
免费 | 241篇 |
出版年
2022年 | 10篇 |
2021年 | 27篇 |
2020年 | 20篇 |
2019年 | 24篇 |
2018年 | 30篇 |
2017年 | 26篇 |
2016年 | 58篇 |
2015年 | 78篇 |
2014年 | 93篇 |
2013年 | 235篇 |
2012年 | 198篇 |
2011年 | 168篇 |
2010年 | 116篇 |
2009年 | 121篇 |
2008年 | 205篇 |
2007年 | 198篇 |
2006年 | 188篇 |
2005年 | 170篇 |
2004年 | 213篇 |
2003年 | 182篇 |
2002年 | 190篇 |
2001年 | 68篇 |
2000年 | 52篇 |
1999年 | 62篇 |
1998年 | 50篇 |
1997年 | 47篇 |
1996年 | 32篇 |
1995年 | 38篇 |
1994年 | 24篇 |
1993年 | 36篇 |
1992年 | 61篇 |
1991年 | 61篇 |
1990年 | 50篇 |
1989年 | 39篇 |
1988年 | 42篇 |
1987年 | 34篇 |
1986年 | 22篇 |
1985年 | 37篇 |
1984年 | 47篇 |
1983年 | 25篇 |
1982年 | 23篇 |
1981年 | 22篇 |
1980年 | 21篇 |
1979年 | 19篇 |
1978年 | 20篇 |
1977年 | 13篇 |
1976年 | 22篇 |
1975年 | 15篇 |
1974年 | 12篇 |
1973年 | 12篇 |
排序方式: 共有3617条查询结果,搜索用时 31 毫秒
61.
62.
63.
Batdorj Enkhjin AlOgayil Najla Zhuang Qinwei Kim-wee Galvez Jose Hector Bauermeister Klara Nagata Kei Kimura Tohru Ward Monika A. Taketo Teruko Bourque Guillaume Naumova Anna K. 《Mammalian genome》2023,34(1):44-55
Mammalian Genome - Several lines of evidence suggest that the presence of the Y chromosome influences DNA methylation of autosomal loci. To better understand the impact of the Y chromosome on... 相似文献
64.
The population and production ecology of aZizania latifolia stand at a sheltered shore of the Hitachi-Tone River were investigated. Shoot emergence was observed twice a year; the fist
was a synchronized shoot emergence in April and the second was from August to October. Aboveground biomass was mostly occupied
by leaves and peaked at 1500 g dry weight m−2 in August. The belowground biomass also reached its peak, 750 g dry weight m−2, in August. The secondary shoots were small in spite of their high density. Leaves were produced continuously throughout
the season. The leaf life span was as short as 55.6 days for cohorts that emerged from May through to September. Total annual
net production ofZ. latifolia could be more than 3400 g dry weight m−2. Shoot clusters of several centimeters were observed in April. The following self-thinning caused a regular distribution
of the remaining shoots in August. Most shoots produced in August to October were found near a shoot persisting since April.
They showed more concentrated distribution than shoots in April. A large biomass allocation to leaves and the ability to produce
many clump shoots during the late growing period may facilitate dominance ofZ. latifolia in relatively sheltered sites. 相似文献
65.
66.
Yoriko Masuda Satoshi Haramizu Kasumi Oki Koichiro Ohnuki Tatsuo Watanabe Susumu Yazawa Teruo Kawada Shu-ichi Hashizume Tohru Fushiki 《Journal of applied physiology》2003,95(6):2408-2415
Capsiate is a nonpungent capsaicin analog, a recently identified principle of the nonpungent red pepper cultivar CH-19 Sweet. In the present study, we report that 2-wk treatment of capsiate increased metabolic rate and promoted fat oxidation at rest, suggesting that capsiate may prevent obesity. To explain these effects, at least in part, we examined uncoupling proteins (UCPs) and thyroid hormones. UCPs and thyroid hormones play important roles in energy expenditure, the maintenance of body weight, and thermoregulation. Two-week treatment of capsiate increased the levels of UCP1 protein and mRNA in brown adipose tissue and UCP2 mRNA in white adipose tissue. This dose of capsiate did not change serum triiodothyronine or thyroxine levels. A single dose of capsiate temporarily raised both UCP1 mRNA in brown adipose tissue and UCP3 mRNA in skeletal muscle. These results suggest that UCP1 and UCP2 may contribute to the promotion of energy metabolism by capsiate, but that thyroid hormones do not. 相似文献
67.
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
68.
Shimizu Tsutomu; Hashimoto Naoya; Nakayama Ishizue; Nakao Tohru; Mizutani Hiroyuki; Unai Tadaaki; Yamaguchi Mikio; Abe Hiroshi 《Plant & cell physiology》1995,36(4):625-632
A novel isourazole herbicide, fluthiacet-methyl (methyl [[2-chloro-4-fluoro-5-[(5,6,7,8-tetrahydro-3-oxo-lH,3H-[l,3,4]thiadiazolo[3,4-a]pyridazin-l-ylidene)amino]phenyrjthio]acetate;experimental code name, KIH-9201) promoted the leakage of electrolytesfrom cotyledons of velvetleaf (Abtilon theophtasti Medic) andcotton (Gossypium hirsutum L.) plants that are sensitive tothis compound. It induced the accumulation of protoporphyrinIX in cotyledons of cotton and inhibited Chl biosynthesis incotyledons of velvetleaf and cotton at low concentrations (I50values, 1012 nM). Fluthiacet-methyl was converted toits urazole by glutathione S-transferase that had been partiallypurified from velvetleaf. The urazole inhibited protoporphyrinogenoxidase (Protox, EC 1.3.3.4
[EC]
) from some plants, including velvetleaf,at low concentrations (I50 values, 5.111 nM), whereasfluthiacet-methyl was not as potent. The effects in vivo (electrolyteleakage and inhibition of Chi biosynthesis) of fluthiacet-methylwere correlated with the inhibition of Protox activity by theurazole and not with the action of fluthiacet-methyl itself.From these results, it is concluded that fluthiacet-methyl inhibitsProtox activity after conversion to the corresponding urazoleby glutathione S-transferase. It is in this way that fluthiacet-methylexerts its effect as a light-dependent peroxidizing herbicide. (Received November 1, 1994; Accepted March 6, 1995) 相似文献
69.
70.
Mutational analysis of amiloride sensitivity of the NhaA Na+/H+ antiporter from Vibrio parahaemolyticus. 下载免费PDF全文
The activity of the NhaA Na+/H+ antiporter of Vibrio parahaemolyticus is inhibited by amiloride. We found an amino acid sequence in the NhaA that was identical to a putative amiloride binding domain of the Na+/H+ exchanger in mammalian cells. We constructed mutant NhaAs that had amino acid substitutions in the putative amiloride binding domain by site-directed mutagenesis. These include V62L (Val62 replaced by Leu), F63Y, F64Y, and L65F. Most mutant NhaAs showed decreased sensitivity for amiloride. Among these, the F64Y mutant NhaA showed the least amiloride sensitivity, with a Ki value 7 to 10 times greater than that in the wild type. Thus, the sequence between residues V62 and L65 in NhaA, especially F64, is very important for the inhibitory effect of amiloride on the antiporter. 相似文献