全文获取类型
收费全文 | 2858篇 |
免费 | 267篇 |
出版年
2023年 | 20篇 |
2022年 | 32篇 |
2021年 | 83篇 |
2020年 | 54篇 |
2019年 | 56篇 |
2018年 | 70篇 |
2017年 | 55篇 |
2016年 | 89篇 |
2015年 | 159篇 |
2014年 | 155篇 |
2013年 | 175篇 |
2012年 | 240篇 |
2011年 | 248篇 |
2010年 | 127篇 |
2009年 | 108篇 |
2008年 | 172篇 |
2007年 | 189篇 |
2006年 | 174篇 |
2005年 | 132篇 |
2004年 | 132篇 |
2003年 | 122篇 |
2002年 | 102篇 |
2001年 | 31篇 |
2000年 | 12篇 |
1999年 | 25篇 |
1998年 | 26篇 |
1997年 | 18篇 |
1996年 | 19篇 |
1995年 | 15篇 |
1994年 | 9篇 |
1993年 | 14篇 |
1992年 | 16篇 |
1991年 | 11篇 |
1990年 | 18篇 |
1989年 | 5篇 |
1986年 | 5篇 |
1985年 | 7篇 |
1984年 | 9篇 |
1983年 | 7篇 |
1982年 | 10篇 |
1981年 | 7篇 |
1980年 | 6篇 |
1978年 | 6篇 |
1977年 | 6篇 |
1974年 | 8篇 |
1973年 | 9篇 |
1971年 | 5篇 |
1970年 | 5篇 |
1964年 | 6篇 |
1961年 | 5篇 |
排序方式: 共有3125条查询结果,搜索用时 15 毫秒
21.
Cosmo G. MacKenzie Julia B. MacKenzie Oscar K. Reiss 《The Journal of cell biology》1962,14(2):269-279
A cell has been isolated from explanted rabbit liver which contains, during all phases of its growth in culture, hundreds of lipid-rich particles with a distinct limiting membrane. The cell grows logarithmically with a generation time of 19 to 20 hours and during mitosis the particles are distributed between the daughter cells. Associated with the particles is the high total lipid content of the rabbit liver cell as compared with a rat liver cell, which contains few, if any, lipid-rich particles. This difference in lipid content between the two cells is due primarily to an increase in the triglyceride fraction, in contradistinction to small differences in the polar lipid and sterol ester fractions. The lipid-rich particles have been isolated and found to contain 90 per cent triglyceride on a dry weight basis. The "genetic" factors responsible for the high concentration of lipid-rich particles and triglycerides in the rabbit liver cell require for their full expression one or more factors which are present in much higher effective concentrations in rabbit serum than in horse serum. The hypothesis is advanced that the lipid-rich particles represent a normal state of the non-structural cell lipid. A procedure is described for the quantitative isolation of the lipid of cultured cells. 相似文献
22.
23.
De Andrade Antônio V. M. Da Costa Nivan B. Longo Ricardo L. Malta Oscar L. Simas Alfredo M. De Sá Gilberto F. 《Molecular Engineering》1997,7(3-4):293-308
Theoretical techniques have been developed and/or improved to predict the molecular structure of lanthanide complexes which
were used to calculate their electronic properties, in particular, their electronic spectra and energy levels necessary to
calculate the rates of energy transfer from the ligands to the metal ion. The molecular structure has been obtained by the
SMLC/AM1 (Sparkle Model for the Calculation of Lanthanide Complexes – Austin Model 1) model where the lanthanide ion is simulated
by a sparkle implemented into the AM1 Hamiltonian used to perform a HF-SCF (Hartree-Fock Self-Consistent Field) calculation.
The previous implementation of the SMLC/AM1 model (sparkle/1) involving only two parameters has been generalized to be consistent
with the AM1 Hamiltonian and the new model (sparkle/2) significantly improved the prediction of molecular structures of Eu(III)
complexes. For the electronic spectra and energy level calculations of the lanthanide complexes the model replaces the metal
ion by a point charge with the ligands held in their positions as determined by the SMLC/AM1 model, and uses a INDO/S-CI (intermediate
neglect of differential overlap/spectroscopic-configuration interaction) model. A preliminary study of the solvent effects
on the absorption spectra of the free ligand is also presented. For the ligand-lanthanide ion energy transfer Fermi's golden
rule is used with the multipolar and exchange mechanisms being implemented and tested for several complexes. These theoretical
techniques have been applied to several complexes yielding very good results when compared to experimental data as well as
predictions for the molecular and electronic structures and the relative contributions of the mechanisms for the energy transfer
rates.
This revised version was published online in June 2006 with corrections to the Cover Date. 相似文献
24.
25.
Sublocalization of an Ataxia-Telangiectasia Gene Distal to D11S384 by Ancestral Haplotyping In Costa Rican Families 总被引:8,自引:4,他引:4 下载免费PDF全文
Nancy Uhrhammer Ethan Lange Oscar Porras Arash Naeim Xiaoguang Chen Sepideh Sheikhavandi Sujata Chiplunkar Lan Yang Sugandha Dandekar Teresa Liang Nima Patel Sharon Teraoka Nitin Udar Nidia Calvo Patrick Concannon Kenneth Lange Richard A. Gatti 《American journal of human genetics》1995,57(1):103-111
In an effort to localize a gene for ataxia-telangiectasia (A-T), we have genotyped 27 affected Costa Rican families, with 13 markers, in the chromosome 11q22-23 region. Significant linkage disequilibrium was detected for 9/13 markers between D11S1816 and D11S1391. Recombination events observed in these pedigrees places A-T between D11S1819 and D11S1960. One ancestral haplotype is common to 24/54 affected chromosomes and roughly two-thirds of the families. Inferred (ancestral) recombination events involving this common haplotype in earlier generations suggest that A-T is distal to D11S384 and proximal to D11S1960. Several other common haplotypes were identified, consistent with multiple mutations in a single gene. When considered together with all other evidence, this study further sublocalizes the major A-T locus to ≈200 kb, between markers S384 and S535. 相似文献
26.
White, pink, orange, and yellow strains ofUstilago violacea containing high and low levels of cytochrome c and various carotenes were exposed to ultraviolet light. The survival curves for all strains were of exponential decay form, but the carotene-accumulating strains were generally more resistant to UV than those strains with no carotenes at all. The UV exposure time leading to 90% loss in viability, LD90, was quantitatively related to the carotene content in the form of a power function, where LD90 increased as the fifth root of the total carotene content per cell. We also determined that the ratio of total carotenes to total cytochrome c per cell was quantitatively related to the rate of viability loss during UV exposure. 相似文献
27.
Marden A. De Alvarenga Oscar Castro C. Astréa M. Giesbrecht Otto R. Gottlieb 《Phytochemistry》1977,16(11):1801-1804
Six bicyclo[3,2,1]octanoid neolignans, isolated from the benzene extract of Aniba simulans Allen (Lauraceae) trunk wood, are shown to derive from two basic structures: 1-allyl-8-hydroxy-6-(3′-methoxy-4′,5′-methylenedioxyphenyl)-7-methyl-3-oxobicyclo[3,2,1]octane, substituted by 4-hydroxy, 4-hydroxy-5-methoxy, 4-methoxy or 4,5-dimethoxy groups; and 1-allyl-8-hydroxy-6-(3′-methoxy-4′,5′-methylenedioxyphenyl)-7-methyl-4-oxobicyclo[3,2,1]oct-2-ene, substituted by 3-hydroxy or 3-hydroxy-5-methoxy groups. The structural proposals are based on spectral data, interconversions synthesis of a derivative from the known (2R,3S,3aS)-3a-allyl-5-methoxy-2-(3′-methoxy,4′,5′-methylenedioxyphenyl)-3-methyl-2,3,3a,6-tetrahydro-6-oxobenzofuran. 相似文献
28.
29.
Myelin proteolipid protein (PLP) is an acylated protein which contains approximately 2 mol of ester-bound fatty acids. In this study, the amount and composition of fatty acids covalently bound to human myelin PLP were determined during development and in peroxisomal disorders. Palmitic, oleic, and stearic acids accounted for most of the PLP acyl chains. However, in contrast to PLP in other species, human PLP contains relatively more very long chain fatty acids (VLCFA). The fatty acid composition remained essentially unchanged between 1 day and 74 years of age. The total amount of fatty acid bound to PLP was not altered in any of the pathological cases examined. However, in the peroxisomal disorder adrenoleukodystrophy, the proportions of saturated and, to a lesser extent, monounsaturated VLCFA bound to PLP were increased at the expense of oleic acid. Smaller, but significant, changes were observed in adrenomyeloneuropathy. The reduction in the levels of oleic acid was also observed in two other peroxisomal disorders, the cerebrohepatorenal (Zellweger) syndrome and neonatal adrenoleukodystrophy, as well as in the lysosomal disorder Krabbe globoid cell leukodystrophy. However, in these disorders, the decrease in oleic acid occurred at the expense of stearic acid, and not VLCFA. The results indicate that, although a characteristic PLP fatty acid pattern is normally maintained, changes in the acyl chain pool can ultimately be reflected in the fatty acid composition of the protein. The altered PLP-acyl chain pattern in peroxisomal disorders may contribute to the pathophysiology of these devastating disorders. 相似文献
30.
Extraction of whole lobes of normal rat liver with dimethyl sulphoxide (DMSO) under N2 gives extracts which contain 5—10 μmol/l·O?2 (50-100 nmol·O?2 per 10 ml extract per 4 g liver; 1.25-2.50 nmol·O?2 per millilitre per gram liver). Evidence for ·O?2 in the extracts is given by: (1) electron spin resonance signals (ESR), (2) differential pulse polarography (DPP), (3) chemiluminescence (CL), and (4) nitroblue tetrazolium reduction (NBT). All tests yield results identical with those obtained with authentic ·O?2. Extraction of ·O?2 is enhanced by tetrabutyl ammonium ion, and is maximal at 1-3 min. These results raise the possibility that substantial amounts of ·O?2 are normally sequestered in protective membranous sites in vivo. 相似文献