全文获取类型
收费全文 | 806篇 |
免费 | 64篇 |
国内免费 | 1篇 |
出版年
2023年 | 4篇 |
2021年 | 15篇 |
2020年 | 4篇 |
2019年 | 7篇 |
2018年 | 10篇 |
2017年 | 11篇 |
2016年 | 25篇 |
2015年 | 33篇 |
2014年 | 46篇 |
2013年 | 43篇 |
2012年 | 62篇 |
2011年 | 65篇 |
2010年 | 40篇 |
2009年 | 34篇 |
2008年 | 44篇 |
2007年 | 32篇 |
2006年 | 40篇 |
2005年 | 34篇 |
2004年 | 22篇 |
2003年 | 33篇 |
2002年 | 28篇 |
2001年 | 35篇 |
2000年 | 24篇 |
1999年 | 27篇 |
1998年 | 5篇 |
1996年 | 6篇 |
1995年 | 5篇 |
1994年 | 7篇 |
1993年 | 3篇 |
1992年 | 9篇 |
1991年 | 6篇 |
1990年 | 14篇 |
1989年 | 10篇 |
1988年 | 6篇 |
1987年 | 4篇 |
1986年 | 3篇 |
1985年 | 3篇 |
1983年 | 8篇 |
1982年 | 3篇 |
1981年 | 7篇 |
1980年 | 3篇 |
1977年 | 4篇 |
1976年 | 3篇 |
1975年 | 10篇 |
1974年 | 4篇 |
1973年 | 5篇 |
1971年 | 3篇 |
1970年 | 2篇 |
1969年 | 2篇 |
1967年 | 2篇 |
排序方式: 共有871条查询结果,搜索用时 15 毫秒
1.
G S Pai Y Yan D M DeBauche W S Stanley S R Paul 《Cytogenetics and cell genetics》1989,52(3-4):186-189
We studied the responses of several dyskeratosis congenita (DC) cell lines to the DNA strand-cleaving and base-damaging agent bleomycin. Fibroblasts, peripheral blood lymphocytes, and transformed lymphoblasts of six DC patients and an obligate DC heterozygote showed more chromatid breaks than did respective controls exposed to various concentrations of bleomycin during the G2 phase of the cell cycle (P less than 0.0001). Unsynchronized DC fibroblasts in culture also showed decreased survival, compared to normals, following bleomycin treatment. DC lymphocytes treated with bleomycin for the final 24 h of culture showed more chromatid- and chromosome-type damage than did normals (P less than 0.0001) or G0-treated DC lymphocytes. Spontaneous chromosome breakage was normal in all six DC cell lines. The ability to distinguish affected and heterozygous DC cells without spontaneous chromosome instability from normals on the basis of their bleomycin hypersensitivity provides a marker for future studies of the pathogenesis of this disorder. 相似文献
2.
3.
4.
M C Kao J A Wuu S H Pai 《Proceedings of the National Science Council, Republic of China. Part B, Life sciences》1990,14(1):15-19
A phosphofructokinase gene was screened and cloned from a human genomic library prepared in the lambda EMBL4 phage vector. DNA sequencing shows that the first exon of this human phosphofructokinase gene is identical in length and highly homologous in sequence to that of a rabbit phosphofructokinase gene. Two amino acid replacements are indicated, an Arg----Lys and a Val----Ile at positions 9 and 13, respectively. Eleven base substitutions, 8 of them silent, are identified. Surprisingly, at ten of these sites, complete bias for A's and T's in the human gene and C's and G's in the rabbit gene are seen. Strong conservation is also observed in the 5' untranslated region and for the first 15 base pairs in the intron. All the nine variant nucleotides in these regions are, again, A's and T's in the human gene and G's and C's in the rabbit gene. The unit evolutionary period of change between the first exon of rabbit and human phosphofructokinase genes is estimated as 2.3 million years at silent sites and 15.6 million years at replacement sites. 相似文献
5.
N Schiering V S Stoll J S Blanchard E F Pai 《The Journal of biological chemistry》1989,264(35):21144-21145
NADH peroxidase from Streptococcus faecalis 10C1 has been crystallized from ammonium sulfate solutions using the hanging drop vapor diffusion method. Depending on pH, the crystals grew in the orthorhombic space group I222 or one of its subgroups P222 or P2(1)2(1)2 (or one of its two permutations). In both cases the unit cell axes are a = 76.6 A, b = 132.9 A, and c = 145.7 A. There are two monomers/asymmetric unit in the body-centered crystal form and four in the primitive one. The enzyme is catalytically active in the crystalline state. The crystals diffract to at least 2.5 A resolution; they are stable in the x-ray beam and hence suitable for detailed three-dimensional structure determination. 相似文献
6.
Inderjit Singh Karl Kremser Bidyut Ghosh Avtar K. Singh Shashidhar Pai 《Journal of neurochemistry》1996,67(6):2373-2378
Abstract: Peroxisomal disorders are a newly described group of inherited neurological diseases. In disorders of peroxisomal biogenesis, e.g., Zellweger syndrome, owing to the lack of peroxisomes, catalase, a peroxisomal enzyme, is found to be present in the cytoplasm instead. We observed higher catalase activity (7.59 ± 0.41 mU/mg of protein) in cultured skin fibroblasts from Zellweger patients than in control fibroblasts (4.45 ± 0.29 mU/mg of protein). Moreover, we also found that the majority of the catalase in Zellweger cells was present in the inactive form. The specific activities following reactivation in Zellweger and control cells were 12.1 and 4.9 mU/mg of protein, respectively. To understand the molecular basis of higher levels of catalase in Zellweger than control cells, we examined the rate of synthesis and turnover of catalase and levels of catalase mRNA and protein levels in Zellweger cells as compared with control cells. The initial rates of synthesis of catalase in Zellweger (1.68 ± 0.15 mU/mg of protein) and control (1.51 ± 0.14 mU/mg of protein) cells were similar. The rates of turnover of catalase in Zellweger (t1/2 = 47 ± 8 h) and control (t1/2 = 49 ± 7 h) were also similar. Consistent with the enzyme activity, the levels of catalase protein were higher in Zellweger cells as compared with control cells. On the other hand, there was no difference in the level of catalase mRNA between control and Zellweger cells. Although the rate of synthesis in Zellweger and control cells were initially similar, it was down-regulated to a lower level at ~72 h of culture in control fibroblasts as compared with Zellweger cells, which continued to synthesize catalase at the same rate up to 5 days in culture. The presence of similar levels of mRNA in control and Zellweger cells and continued synthesis of catalase in Zellweger cells at a higher level as compared with control cells suggest a loss of regulation at the translational level. 相似文献
7.
Characterization of the cDNA coding for mouse prothrombin and localization of the gene on mouse chromosome 2 总被引:6,自引:0,他引:6
S J Degen L A Schaefer C S Jamison S G Grant J J Fitzgibbon J A Pai V M Chapman R W Elliott 《DNA and cell biology》1990,9(7):487-498
A series of overlapping cDNAs coding for mouse prothrombin (coagulation factor II) have been isolated and the composite DNA sequence has been determined. The complete prothrombin cDNA is 1,987 bp in length [excluding the poly(A) tail] and codes for 18 bp of 5' untranslated sequence, an open reading frame coding for 618 amino acids, a stop codon, and a 3' untranslated region of 112 bp followed by a poly(A) tail. The translated amino acid sequence predicts a molecular weight of 66,087, which includes 10 residues of gamma-carboxyglutamic acid. There are five potential N-linked glycosylation sites. Mouse prothrombin is 81.4% and 77.3% identical to the human and bovine proteins, respectively. Comparison of the cDNA coding for mouse prothrombin to the human and bovine cDNAs indicates 79.9% and 76.5% identity, respectively. Amino acid residues important for the structure and function of human prothrombin are conserved in the mouse and bovine proteins. In the adult mouse and rat, prothrombin is primarily synthesized in the liver, where is constitutes 0.07% of total mRNA as determined by solution hybridization analysis. The genetic locus for mouse prothrombin, Cf-2, has been mapped using an interspecies backcross and DNA fragment differences between the two species. The prothrombin locus lies on mouse chromosome 2, 1.8 +/- 1.3 map units proximal to the catalase locus. The gene order in this region is Cen-Acra-Cf-2-Cas-1-A-Tel. This localization extends the proximal boundary of the known region of homology between mouse chromosome 2 and human chromosome 11p from Cas-1 about 2 map units toward the centromere. 相似文献
8.
Ledia Vasjari Stephanie Bresan Christoph Biskup Govind Pai 《Cell cycle (Georgetown, Tex.)》2019,18(2):204-225
Numerous studies exploring oncogenic Ras or manipulating physiological Ras signalling have established an irrefutable role for Ras as driver of cell cycle progression. Despite this wealth of information the precise signalling timeline and effectors engaged by Ras, particularly during G1, remain obscure as approaches for Ras inhibition are slow-acting and ill-suited for charting discrete Ras signalling episodes along the cell cycle. We have developed an approach based on the inducible recruitment of a Ras-GAP that enforces endogenous Ras inhibition within minutes. Applying this strategy to inhibit Ras stepwise in synchronous cell populations revealed that Ras signaling was required well into G1 for Cyclin D induction, pocket protein phosphorylation and S-phase entry, irrespective of whether cells emerged from quiescence or G2/M. Unexpectedly, Erk, and not PI3K/Akt or Ral was activated by Ras at mid-G1, albeit PI3K/Akt signalling was a necessary companion of Ras/Erk for sustaining cyclin-D levels and G1/S transition. Our findings chart mitogenic signaling by endogenous Ras during G1 and identify limited effector engagement restricted to Raf/MEK/Erk as a cogent distinction from oncogenic Ras signalling. 相似文献
9.
10.
Hui Chen Pai Sunil Kumar Chien-Chang Shen Jing Ping Liou Shiow Lin Pan Che Ming Teng 《PloS one》2015,10(4)