全文获取类型
收费全文 | 1034篇 |
免费 | 98篇 |
国内免费 | 3篇 |
专业分类
1135篇 |
出版年
2022年 | 7篇 |
2021年 | 11篇 |
2020年 | 5篇 |
2019年 | 7篇 |
2018年 | 16篇 |
2017年 | 5篇 |
2016年 | 13篇 |
2015年 | 32篇 |
2014年 | 42篇 |
2013年 | 42篇 |
2012年 | 40篇 |
2011年 | 44篇 |
2010年 | 40篇 |
2009年 | 33篇 |
2008年 | 33篇 |
2007年 | 47篇 |
2006年 | 41篇 |
2005年 | 43篇 |
2004年 | 39篇 |
2003年 | 35篇 |
2002年 | 34篇 |
2001年 | 40篇 |
2000年 | 45篇 |
1999年 | 25篇 |
1998年 | 12篇 |
1997年 | 20篇 |
1996年 | 15篇 |
1995年 | 15篇 |
1994年 | 9篇 |
1993年 | 13篇 |
1992年 | 22篇 |
1991年 | 23篇 |
1990年 | 22篇 |
1989年 | 26篇 |
1988年 | 29篇 |
1987年 | 23篇 |
1986年 | 13篇 |
1985年 | 12篇 |
1984年 | 16篇 |
1983年 | 11篇 |
1982年 | 11篇 |
1981年 | 10篇 |
1980年 | 20篇 |
1979年 | 17篇 |
1978年 | 13篇 |
1977年 | 10篇 |
1976年 | 8篇 |
1975年 | 7篇 |
1974年 | 8篇 |
1970年 | 7篇 |
排序方式: 共有1135条查询结果,搜索用时 15 毫秒
1.
Ronald J.A. Wanders Carlo Van Roermund Cor Lof Alfred J. Meijer 《Analytical biochemistry》1983,129(1):80-87
A simple fluorimetric assay for the determination of carbamoyl phosphate in tissue extracts is described. In the assay, production of ATP from carbamoyl phosphate and ADP by carbamate kinase is coupled to the formation of NADPH, using glucose, hexokinase, NADP+, and glucose-6-phosphate dehydrogenase. Production of NADPH in this system proved to be equal to the amount of carbamoyl phosphate present. 相似文献
2.
A Merlin W Voos A C Maarse M Meijer N Pfanner J Rassow 《The Journal of cell biology》1999,145(5):961-972
Tim44 is a protein of the mitochondrial inner membrane and serves as an adaptor protein for mtHsp70 that drives the import of preproteins in an ATP-dependent manner. In this study we have modified the interaction of Tim44 with mtHsp70 and characterized the consequences for protein translocation. By deletion of an 18-residue segment of Tim44 with limited similarity to J-proteins, the binding of Tim44 to mtHsp70 was weakened. We found that in the yeast Saccharomyces cerevisiae the deletion of this segment is lethal. To investigate the role of the 18-residue segment, we expressed Tim44Delta18 in addition to the endogenous wild-type Tim44. Tim44Delta18 is correctly targeted to mitochondria and assembles in the inner membrane import site. The coexpression of Tim44Delta18 together with wild-type Tim44, however, does not stimulate protein import, but reduces its efficiency. In particular, the promotion of unfolding of preproteins during translocation is inhibited. mtHsp70 is still able to bind to Tim44Delta18 in an ATP-regulated manner, but the efficiency of interaction is reduced. These results suggest that the J-related segment of Tim44 is needed for productive interaction with mtHsp70. The efficient cooperation of mtHsp70 with Tim44 facilitates the translocation of loosely folded preproteins and plays a crucial role in the import of preproteins which contain a tightly folded domain. 相似文献
3.
The rate of proteolysis is an important determinant of the intracellular protein content. Part of the degradation of intracellular
proteins occurs in the lysosomes and is mediated by macroautophagy. In liver, macroautophagy is very active and almost completely
accounts for starvation-induced proteolysis. Factors inhibiting this process include amino acids, cell swelling and insulin.
In the mechanisms controlling macroautophagy, protein phosphorylation plays an important role. Activation of a signal transduction
pathway, ultimately leading to phosphorylation of ribosomal protein S6, accompanies inhibition of macroautophagy. Components
of this pathway may include a heterotrimeric Gi3-protein, phosphatidylinositol 3- kinase and p70S6 kinase. Recent evidence
indicates that lysosomal protein degradation can be selective and occurs via ubiquitin- dependent and -independent pathways.
This revised version was published online in November 2006 with corrections to the Cover Date. 相似文献
4.
Regulation of autotrophic metabolism in Pseudomonas oxalaticus OX1 wild-type and an isocitrate-lyase-deficient mutant 总被引:1,自引:0,他引:1
In Pseudomonas oxalaticus the activity and synthesis of the Calvin cycle enzyme ribulose-1,5-bisphosphate carboxylase/oxygenase (RuBisCO) are regulated by inactivation and endproduct repression, respectively. Phosphoenolpyruvate (PEP) has been suggested to function as a signal molecule for the latter control system. During growth of the organism in carbon-source-limited continuous cultures with various ratios of acetate and formate in the feed, the RuBisCO levels varied considerably, but no correlation was observed with the intracellular concentrations of PEP. To study whether the repression exerted by acetate utilization was dependent on the synthesis of glycolytic intermediates from this compound, an acetate-negative mutant defective in isocitrate lyase was isolated and characterized. Clear evidence was obtained that in this mutant acetate is as effective in repressing RuBisCO synthesis as in the wild-type. It therefore appears more likely that acetyl-CoA or a closely related metabolite functions as a signal molecule in the regulation of RuBisCO synthesis. 相似文献
5.
6.
Cloning and sequencing of the peroxisomal amine oxidase gene from Hansenula polymorpha 总被引:7,自引:0,他引:7
P G Bruinenberg M Evers H R Waterham J Kuipers A C Arnberg G AB 《Biochimica et biophysica acta》1989,1008(2):157-167
We have cloned the AMO gene, encoding the microbody matrix enzyme amine oxidase (EC 1.4.3.6) from the yeast Hansenula polymorpha. The gene was isolated by differential screening of a cDNA library, immunoselection, and subsequent screening of a H. polymorpha genomic library. The nucleotide sequence of a 3.6 kilobase stretch of DNA containing the amine oxidase (AMO) gene was determined. The AMO gene contains an open reading frame of 692 amino acids, with a relative molecular mass of 77,435. The 5' and 3' ends of the gene were mapped and show that the transcribed region measures 2134 nucleotides. The derived amino-acid sequence was confirmed by sequencing an internal proteolytic fragment of the purified protein. Amine oxidase contains the tripeptide sequence Ser-Arg-Leu, located 9 residues from the carboxy terminus, which may represent the topogenic signal for protein import into microbodies. 相似文献
7.
J H Meijer 《European journal of morphology》1990,28(2-4):308-316
The suprachiasmatic nuclei of the hypothalamus contain a major circadian pacemaker. The most important external stimulus that affects the circadian pacemaker is the environmental light-dark cycle. The effects of light and darkness on the pacemaker at various phases of the circadian cycle have been well documented. In this paper these effects are summarized briefly. A number of pharmacological and neurophysiological studies will then be presented that are related to the processing of light information by the circadian system. It will be considered whether these studies have increased insight in the behavioral responsiveness to light. 相似文献
8.
9.
W J Kort A M Bijma J J van Dam A C van der Ham J M Hekking H F van der Ingh W S Meijer M G van Wilgenburg F J Zijlstra 《Prostaglandins, leukotrienes, and essential fatty acids》1992,45(4):319-327
In 19 patients with a malignant breast tumor, tumor tissue and blood were taken to determine the eicosanoid profile and platelet aggregation. Values were compared with those of patients with benign tumors (n = 4), or undergoing a mammary reduction (n = 7). Postoperatively, blood was taken as well in order to compare pre- and postoperative values. Eicosanoids were measured in peripheral blood monocytes and mammary tissue by means of HPLC; furthermore, TXA2, 6-keto-PGF1 alpha, and PGE2 were determined by RIA. Differences in pre- and postoperative values of cancer patients were seen in plasma RIA values: PGE2 and 6-k-PGF1 alpha were significantly higher preoperatively when compared with postoperatively, however, such differences were seen in the control groups as well. Compared to benign tumor or mammary reduction test material the eicosanoid profile of tissue obtained from malignant mammary tumors showed important differences. Except for PGF2 alpha, HHT and 15-HETE no detectable quantities of eicosanoids were found in the non-tumor material, whereas in the malignant tumor material substantial quantities of a number of eicosanoid metabolites were present. Statistically significant correlations could be established between patient/histopathology data and the results of the platelet aggregation assays, e.g. between menopausal status and ADP aggregation; oestrogen receptor (+/-) and collagen and arachidonic acid aggregation, inflammatory cell infiltration score and arachidonic acid aggregation and fibrosis score and ADP aggregation. The results show that eicosanoid synthesis in material from mammary cancer patients is different from that in benign mammary tissue. The implications, in particular, in relation to future prognosis of the patient, remain obscure. 相似文献
10.
A universal intracellular factor, the 'M phase-promoting factor' (MPF), triggers the G2/M transition of the cell cycle in all organisms. In late G2, it is present as an inactive complex of tyrosine-phosphorylated p34cdc2 and unphosphorylated cyclin Bcdc13. In M phase, its activation as an active MPF displaying histone H1 kinase (H1K) originates from the concomitant tyrosine dephosphorylation of the p34cdc2 subunit and the phosphorylation of the cylin Bcdc13 subunit. We have investigated the role of cyclin in the formation of this complex and the tyrosine phosphorylation of p34cdc2, using highly synchronous mitotic sea urchin eggs as a model. As cells leave the S phase and enter the G2 phase, a massive tyrosine phosphorylation of p34cdc2 occurs. This large p34cdc2 tyrosine phosphorylation burst does not arise from a massive increase in p34cdc2 concentration. It even appears to affect only a fraction (non-immunoprecipitable by anti-PSTAIR antibodies) of the total p34cdc2 present in the cell. Several observations point to an extremely close association between accumulation of unphosphorylated cyclin and p34cdc2 tyrosine phosphorylation: (i) both events coincide perfectly during the G2 phase; (ii) both tyrosine-phosphorylated p34cdc2 and cyclin are not immunoprecipitated by anti-PSTAIR antibodies; (iii) accumulation of unphosphorylated cyclin by aphidicolin treatment of the cells, triggers a dramatic accumulation of tyrosine-phosphorylated p34cdc2; and (iv) inhibition of cyclin synthesis by emetine inhibits p34cdc2 tyrosine phosphorylation without affecting the p34cdc2 concentration. These results show that, as it is synthesized, cyclin B binds and recruits p34cdc2 for tyrosine phosphorylation; this inactive complex then requires the completion of DNA replication before it can be turned into fully active MPF. These results fully confirm recent data obtained in vitro with exogenous cyclin added to cycloheximide-treated Xenopus egg extracts. 相似文献