全文获取类型
收费全文 | 2497篇 |
免费 | 173篇 |
出版年
2023年 | 12篇 |
2022年 | 33篇 |
2021年 | 66篇 |
2020年 | 29篇 |
2019年 | 29篇 |
2018年 | 61篇 |
2017年 | 39篇 |
2016年 | 85篇 |
2015年 | 108篇 |
2014年 | 122篇 |
2013年 | 211篇 |
2012年 | 182篇 |
2011年 | 185篇 |
2010年 | 111篇 |
2009年 | 105篇 |
2008年 | 143篇 |
2007年 | 126篇 |
2006年 | 111篇 |
2005年 | 113篇 |
2004年 | 116篇 |
2003年 | 85篇 |
2002年 | 83篇 |
2001年 | 38篇 |
2000年 | 37篇 |
1999年 | 20篇 |
1998年 | 13篇 |
1997年 | 21篇 |
1996年 | 17篇 |
1995年 | 17篇 |
1994年 | 20篇 |
1993年 | 17篇 |
1992年 | 19篇 |
1991年 | 21篇 |
1990年 | 25篇 |
1989年 | 16篇 |
1988年 | 17篇 |
1987年 | 19篇 |
1986年 | 13篇 |
1985年 | 20篇 |
1984年 | 17篇 |
1983年 | 9篇 |
1982年 | 15篇 |
1981年 | 13篇 |
1979年 | 9篇 |
1977年 | 14篇 |
1975年 | 9篇 |
1974年 | 11篇 |
1973年 | 12篇 |
1972年 | 10篇 |
1969年 | 6篇 |
排序方式: 共有2670条查询结果,搜索用时 31 毫秒
1.
2.
NADPH2 and ATP competitively inhibit sweet potato glucose 6-phosphatedehydrogenase with NADP and glucose 6-phosphate (G6P), respectively.At pH 8.0, a Lineweaver-Burk plot of the reciprocal rate againstreciprocal G6P concentration was concave downwards in the presenceand absence of ATP, whereas a double reciprocal plot followedthe Michaelis-Menten relationship at pH 7.0, irrespective ofthe presence of ATP. Many of the other metabolic intermediatestested had no effects on the enzyme reaction.
1 This paper constitutes Part 96 of the Phytopathological Chemistryof Sweet Potato with Black Rot and Injury.
2 Present address: Institute of Applied Microbiology, Universityof Tokyo Bunkyo-ku, Tokyo 113. (Received October 20, 1971; ) 相似文献
3.
4.
Behavioral endocrinology of male rats with periodic sexual contacts with exclusive or varied females
G T Taylor D Komitowski S Muto J Weiss 《Proceedings of the Society for Experimental Biology and Medicine. Society for Experimental Biology and Medicine (New York, N.Y.)》1989,192(3):236-241
Sexual contact keys a profound series of acute and chronic changes in males that, presumably, are orchestrated by acute pulsatile release of hormones. An experimental paradigm is reported in which male rats were paired periodically with either the same or different estrous females to receive identical amounts of copulatory experiences. Results confirmed the hypothesis that exposure to an unfamiliar female would induce a different endocrine response which would be reflected in various androgen-sensitive systems. The "successively polygynous" males showed more sexual behavior than "monogamous" males, and their respective females solicited the males differently, as well. Circulating levels of testosterone were higher immediately after sexual contact with an unfamiliar than with a familiar female partner. There were no differences in testosterone titers among the groups when the animals were killed at either 2 or 7 weeks after the final copulatory experiences. Yet, necropsies at 2 weeks postcopulation revealed that primary and secondary sex structures from polygynous males clearly were larger. Differences between the two experimental groups were reduced after 7 weeks of sexual rest, yet, polygnous males continued to show a different structural profile than the other groups. Conclusions were that males may experience greater activation of androgen-sensitive behavior and physiology following qualitatively different sexual contacts. 相似文献
5.
In the proximal end of the navicular fossa, the stratified columnar epithelium lining the spongy part of the urethra abruptly changes into the stratified squamous one, presenting a sharp demarcation. It is considered that the junction between these 2 epithelia corresponds to the former site of the junction of the entoderm and ectoderm. The width of the microridges in the distal part of the navicular fossa was about doubled compared to that in the proximal part. It is suggested that the epithelium in the distal part is keratinized, while that in the proximal part is nonkeratinized. 相似文献
6.
7.
Summary One hundred twelve human DNA sequences were analyzed with respect to dinucleotide frequency and amino acid composition. The variation in guanine and cytosine (G+C) content revealed: (1) at 2–3 and 3-1 doublet positions CG discrimination is attenuated at high G+C, but TA disfavor is enhanced, and (2) several amino acids are subject to G+C change. These findings have been reported in part for collections of sequences from various species. The present study confirms that in a single organism-the human-the G+C effects do exist. Aspects of the argument that connects G+C with protein thermal stability are also discussed. 相似文献
8.
Solubilization and reconstitution of ca pump from corn leaf plasma membrane 总被引:1,自引:0,他引:1
下载免费PDF全文
![点击此处可从《Plant physiology》网站下载免费的PDF全文](/ch/ext_images/free.gif)
The Ca2+ transport system of corn (Zea mays) leaf plasma membrane is composed of Ca2+ pump and Ca2+/H+ antiporter driven by H+ gradient imposed by a H+ pump (M Kasai, S Muto [1990] J Membr Biol 114: 133-142). It is necessary for characterization of these Ca2+ transporters to establish the procedure for their solubilization, isolation, and reconstitution into liposomes. We attempted to solubilize and reconstitute the Ca2+ pump in the present study. A nonionic detergent octaethyleneglycol monododecyl ether (C12E8) was the most effective detergent for a series of extraction and functional reconstitution of the Ca2+ pump among seven detergents examined. This was judged from activities of ATP-dependent 45Ca2+ uptake into liposomes reconstituted with the respective detergent-extract of the plasma membrane by the detergent dilution method. C12E8-extract of the plasma membrane was subjected to high performance liquid chromatography using a DEAE anion exchange column. Ca2+-ATPase was separated from VO43−-sensitive Mg2+-ATPase. These ATPases were separately reconstituted into liposomes, and their ATP-dependent Ca2+ uptake was measured. The liposomes reconstituted with the Ca2+-ATPase, but not with the VO43−-sensitive Mg2+-ATPase, showed ATP-dependent Ca2+ uptake. Nigericin-induced pH gradient (acid inside) caused only a little Ca2+ uptake into liposomes reconstituted with the Ca2+-ATPase, suggesting that the Ca2+/H+ antiporter was not present in the preparation. These results indicate that the Ca2+-ATPase actually functions as Ca2+ pump in the corn leaf plasma membrane. 相似文献
9.
Levels of tRNAs in bacterial cells as affected by amino acid usage in proteins. 总被引:9,自引:1,他引:8
下载免费PDF全文
![点击此处可从《Nucleic acids research》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Transfer RNAs of Mycoplasma capricolum were separated by two-dimensional polyacrylamide gel electrophoresis, and the relative abundance of each of the 28 known tRNA species was measured. There existed a correlation between the relative amount of isoacceptor tRNAs and the frequency in choosing synonymous codons that could be translated by the isoacceptors. Furthermore, it was observed that the total amount of tRNAs for a particular amino acid was paralleled by the composition of the amino acid in ribosomal proteins. A similar relationship was obtained from reexamination of the previous data on Escherichia coli tRNAs, suggesting that the amount of tRNAs for an amino acid is affected by the usage of the amino acid in proteins. 相似文献
10.
Characteristic distribution of cathepsin E which immunologically cross-reacts with the 86-kDa acid proteinase from rat gastric mucosa 总被引:2,自引:0,他引:2
The antiserum raised against the high-molecular-weight acid proteinase from rat gastric mucosa, termed 86-kDa acid proteinase, has been shown to recognize rat cathepsin E, but not cathepsin D (Muto, N. et al. (1987) J. Biochem. 101, 1069-1075). Using this specific antiserum, characteristic distribution of cathepsin E in rats was demonstrated. The enzyme was detected in a limited number of tissues, such as stomach, thymus, spleen, bladder, and erythrocyte membranes. Among them, the highest activity was observed in the stomach. In contrast, cathepsin D immunoreactive with the antiserum specific to rat gastric cathepsin D was demonstrated in all the tissues examined. Cathepsin E-type enzymes partially purified from these five tissues were precipitated in the same manner by the specific antiserum, and they had the same molecular weight, electrophoretic mobility, and resistance against denaturation by 4 M urea. These results indicate that they could be exactly classified as cathepsin E. This type of enzyme was also detectable in mice and guinea pigs, but they showed relatively weak immunoreactivities with the antiserum. Thus, it is concluded that the distribution of cathepsin E is intrinsically different from ordinary cathepsin D, suggesting that it has a different physiological role from cathepsin D. 相似文献