全文获取类型
收费全文 | 781篇 |
免费 | 43篇 |
出版年
2021年 | 5篇 |
2019年 | 3篇 |
2018年 | 5篇 |
2017年 | 4篇 |
2016年 | 12篇 |
2015年 | 22篇 |
2014年 | 12篇 |
2013年 | 27篇 |
2012年 | 34篇 |
2011年 | 38篇 |
2010年 | 33篇 |
2009年 | 22篇 |
2008年 | 37篇 |
2007年 | 41篇 |
2006年 | 31篇 |
2005年 | 21篇 |
2004年 | 32篇 |
2003年 | 31篇 |
2002年 | 32篇 |
2001年 | 33篇 |
2000年 | 32篇 |
1999年 | 27篇 |
1998年 | 12篇 |
1997年 | 12篇 |
1996年 | 14篇 |
1995年 | 10篇 |
1994年 | 10篇 |
1993年 | 10篇 |
1992年 | 15篇 |
1991年 | 15篇 |
1990年 | 11篇 |
1989年 | 14篇 |
1988年 | 10篇 |
1987年 | 9篇 |
1986年 | 10篇 |
1985年 | 13篇 |
1984年 | 6篇 |
1983年 | 6篇 |
1982年 | 7篇 |
1981年 | 14篇 |
1980年 | 4篇 |
1979年 | 13篇 |
1978年 | 12篇 |
1977年 | 9篇 |
1976年 | 3篇 |
1975年 | 9篇 |
1974年 | 6篇 |
1972年 | 5篇 |
1971年 | 4篇 |
1934年 | 3篇 |
排序方式: 共有824条查询结果,搜索用时 15 毫秒
21.
Mortality of lemmings, Lemmus lemmus, at peak density in a mountainous area of Norway 总被引:1,自引:0,他引:1
H. Steen J. C. Holst T. Solhøy M. Bjerga E. Klaussen I. Prestegard R. C. Sundt ø. Johannesen 《Journal of Zoology》1997,243(4):831-835
We estimated carcass density and determined cause of death in a peak-density lemming, Lemmus lemmus , population at Finse, Norway. Of 74 recovered carcasses, 80% had subcutaneous haematoma (blood underneath the skin) in the head region, though the skin on the skull most often appeared unharmed. Thirty percent were apparently killed by a mustelid predator, while 51% were probably killed by corvids. Carcass density was 26.6 and 9.4ha-1 in good and poor lemming habitats, respectively. 相似文献
22.
A flow-injection system for determination of acetic acid in Escherichia coli cultivations with electrochemical detection based on immobilized acetate kinase (AK), pyruvate kinase (PK) and lactate dehydrogenase (LDH) was developed to cope with the problems related to measurements under process conditions such as interferences from pyruvate, drift of electrode baseline and making the cultivation medium and reagents compatible. The results obtained by flow injection analysis were compared with those obtained with an enzymatic test kit. 相似文献
23.
Active Site Mutations in Yeast Protein Disulfide Isomerase Cause Dithiothreitol Sensitivity and a Reduced Rate of Protein Folding in the Endoplasmic Reticulum 总被引:7,自引:0,他引:7
下载免费PDF全文
![点击此处可从《The Journal of cell biology》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Aspects of protein disulfide isomerase (PDI) function have been studied in yeast in vivo. PDI contains two thioredoxin-like domains, a and a′, each of which contains an active-site CXXC motif. The relative importance of the two domains was analyzed by rendering each one inactive by mutation to SGAS. Such mutations had no significant effect on growth. The domains however, were not equivalent since the rate of folding of carboxypeptidase Y (CPY) in vivo was reduced by inactivation of the a domain but not the a′ domain. To investigate the relevance of PDI redox potential, the G and H positions of each CGHC active site were randomly mutagenized. The resulting mutant PDIs were ranked by their growth phenotype on medium containing increasing concentrations of DTT. The rate of CPY folding in the mutants showed the same ranking as the DTT sensitivity, suggesting that the oxidative power of PDI is an important factor in folding in vivo. Mutants with a PDI that cannot perform oxidation reactions on its own (CGHS) had a strongly reduced growth rate. The growth rates, however, did not correlate with CPY folding, suggesting that the protein(s) required for optimal growth are dependent on PDI for oxidation. pdi1-deleted strains overexpressing the yeast PDI homologue EUG1 are viable. Exchanging the wild-type Eug1p C(L/I)HS active site sequences for C(L/I)HC increased the growth rate significantly, however, further highlighting the importance of the oxidizing function for optimal growth. 相似文献
24.
J J Holst J Fahrenkrug S Knuhtsen S L Jensen S S Poulsen O V Nielsen 《Regulatory peptides》1984,8(3):245-259
Vasoactive intestinal polypeptide (VIP) in the pig pancreas is localized to nerves, many of which travel along the pancreatic ducts. VIP stimulates pancreatic fluid and bicarbonate secretion like secretin. Electrical vagal stimulation in the pig causes an atropine-resistant profuse secretion of bicarbonate-rich pancreatic juice. In an isolated perfused preparation of the pig pancreas with intact vagal nerve supply, electrical vagal stimulation caused an atropine-resistant release of VIP, which accurately parallelled the exocrine secretion of juice and bicarbonate. Perfusion of the pancreas with a potent VIP-antiserum inhibited the effect of vagal stimulation on the exocrine secretion. It is concluded, that VIP is responsible for (at least part of) the neurally controlled fluid and bicarbonate secretion from the pig pancreas. 相似文献
25.
26.
C Crone J Frokjaer-Jensen JJ Friedman O Christensen 《The Journal of general physiology》1978,71(2):195-220
27.
The 1H- and 13C-NMR parameters, chemical shifts and coupling constants, for the pentasaccharide of the genus-specific epitope of Chlamydia lipopolysaccharide and related di-, tri-, and tetra-saccharides have been measured and assigned completely using 1D and 2D techniques, and their structures have been confirmed. NOE experiments indicated the preferred conformation of the pentasaccharide and the component oligosaccharides. The 3JH,H demonstrate a change in conformation by rotation of the C-6-C-7 bond of the side chain of the (2----8)-linked Kdo (unit b) in alpha-Kdo-(2----8)-alpha-Kdo-(2----4)-alpha-Kdo-(2----6)-beta-GlcN-(1--- -6)- GlcNol, alpha-Kdo-(2----8)-alpha-Kdo-(2----4)-alpha-Kdo-(2----6)-beta-GlcNAc-(1- ---O)- allyl, and alpha-Kdo-(2----8)-alpha-Kdo-(2----4)-alpha-Kdo-(2----O)-allyl relative to that preferred in alpha-Kdo-(2----4)-alpha-Kdo-(2----6)-beta-GlcNAc-(1----O)-allyl, alpha-Kdo-(2----8)-alpha-Kdo-(2----O)-allyl, alpha-Kdo-(2----4)-alpha-Kdo-(2----O)-allyl, and alpha-Kdo-(2----6)-beta-GlcNAc-(1----O)-allyl, irrespective of the size of the aglycon, e.g., allyl or beta-D-GlcN residues. The conformational results have been substantiated by computer calculations using the HSEA approach. 相似文献
28.
E V Vinogradov O Holst J E Thomas-Oates K W Broady H Brade 《European journal of biochemistry》1992,210(2):491-498
After acid degradation of the lipopolysaccharide (LPS) of Vibrio cholerae strain H11 (non-O1), a tetrasaccharide was obtained, the structure of which was determined by quantitative and methylation analyses, periodate oxidation, one- and two-dimensional NMR spectroscopy, and fast-atom-bombardment and four-sector tandem mass spectrometry as beta-D-GalANGro-(1-3)-beta-D-QuiNAc-(1-4)-alpha-D-GalANGr o-(1-4)-NeuAc, in which GalANGro is N-galacturonoyl-2-aminoglycerol and QuiN 2-amino-2,6-dideoxy-glucopyranose. In addition, the trisaccharide beta-D-GalANGro-(1-3)-beta-D-QuiNAc-(1-4)-D-altro-hept ulose and the disaccharide alpha-D-GalANGro-(1-4)-NeuAc were isolated from acid-degraded lipopolysaccharide; the occurrence of sedoheptulose in lipopolysaccharide has not been described before. Based on the result of methylation analysis showing that galacturonic acid was the terminal sugar of the polysaccharide chain, and on the assumption that the tri- and the disaccharide represented the reducing and the non-reducing ends of the polysaccharide, respectively, the chemical structure of the O-specific chain of V. cholerae H11 is proposed as alpha-D-GalANGro-(1-4)-alpha-NeuAc-(2-3)-beta-D-GalANGro-(1- 3)-beta-D-QuiNAc- (1-[4)-alpha-D-GalANGro-(1-4)-alpha-NeuAc-(2-3)-beta-D-GalANGro -(1-3)-beta-D- QuiNAc-(1-]n-(1-4)-D-altro-heptulose. However, other possible structures can not be ruled out since the tri- and the disaccharide could be localised at different positions. 相似文献
29.
30.
Prostaglandin Profiles in Tissue and Blood Vessels from Human Brain 总被引:12,自引:8,他引:4
M. Saeed Abdel-Halim H. von Holst B. Meyerson C. Sachs E. Änggård 《Journal of neurochemistry》1980,34(5):1331-1333