全文获取类型
收费全文 | 5673篇 |
免费 | 539篇 |
国内免费 | 5篇 |
出版年
2023年 | 29篇 |
2022年 | 63篇 |
2021年 | 144篇 |
2020年 | 87篇 |
2019年 | 108篇 |
2018年 | 148篇 |
2017年 | 120篇 |
2016年 | 216篇 |
2015年 | 294篇 |
2014年 | 345篇 |
2013年 | 374篇 |
2012年 | 517篇 |
2011年 | 513篇 |
2010年 | 306篇 |
2009年 | 267篇 |
2008年 | 363篇 |
2007年 | 360篇 |
2006年 | 329篇 |
2005年 | 258篇 |
2004年 | 277篇 |
2003年 | 217篇 |
2002年 | 239篇 |
2001年 | 59篇 |
2000年 | 52篇 |
1999年 | 48篇 |
1998年 | 65篇 |
1997年 | 39篇 |
1996年 | 32篇 |
1995年 | 32篇 |
1994年 | 24篇 |
1993年 | 21篇 |
1992年 | 28篇 |
1991年 | 25篇 |
1990年 | 20篇 |
1989年 | 18篇 |
1988年 | 9篇 |
1987年 | 12篇 |
1986年 | 10篇 |
1985年 | 11篇 |
1984年 | 17篇 |
1982年 | 11篇 |
1981年 | 13篇 |
1979年 | 8篇 |
1973年 | 5篇 |
1971年 | 6篇 |
1969年 | 5篇 |
1968年 | 7篇 |
1966年 | 5篇 |
1964年 | 5篇 |
1963年 | 5篇 |
排序方式: 共有6217条查询结果,搜索用时 31 毫秒
21.
22.
Data for this study came from breeding records of 27 Père David's (Elaphurus davidianus) hinds maintained in large pastures and from estrous records of four hand-reared nulliparous hinds. The mean estrous cycle length ranged from 17.5 to 19.6 days. Standing estrus resembled that of other cervids, except that a low, moaning vocalization was given in response to contact, and activity (as measured by pedometers) did not increase. Mean gestation length was 183.38 ± SD 6.11 days (n = 21), and nearly all females conceived in the second and third years. The median interbirth interval was 362 days. The median birth date was April 8, and 80% of the births occurred over a 9.5-week period. Multiparous hinds gave birth an average of 20.5 days earlier in the season than primiparous hinds. There was no dimorphism in birth weight. The results are discussed in light of comparative data for other species. 相似文献
23.
24.
P M Deen J A Dempster B Wieringa C H Van Os 《Biochemical and biophysical research communications》1992,188(3):1267-1273
The cDNA coding for the rat CHIP28 water channel was isolated from a kidney library. At the amino acid level, rat CHIP28 is 93% identical to the recently published human protein (1). Expression of rat CHIP28 mRNA was highest in the renal inner medulla, unchanged during antidiuresis and twice the level expressed in outer cortex, with lower expression levels also apparent in parotid gland, urinary bladder and prostate. The evidence suggests that CHIP28 water channels in the ADH-sensitive collecting tubules are identical to those of the ADH-insensitive proximal convoluted tubules and possibly other tissues specialised in fluid transport. 相似文献
25.
Fine mapping of the Autosomal Dominant Split Hand/Split Foot Locus on Chromosome 7, Band q21.3-q22.1 总被引:6,自引:3,他引:3
下载免费PDF全文
![点击此处可从《American journal of human genetics》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Stephen W. Scherer Parvoneh Poorkaj Todd Allen Julia Kim Dorrit Geshuri Mark Nunes Sylvia Soder Karen Stephens Roberta A. Pagon Michael A. Patton Mary Anne Berg Tim Donlon Horacio Rivera R. A. Pfeiffer Kenji Naritomi Helen Hughes Maurizio Genuardi Fiorella Gurrieri Giovanni Neri Everett Lovrein Ellen Magenis Lap-Chee Tsui James P. Evans 《American journal of human genetics》1994,55(1):12-20
Split hand/split foot (SHFD) is a human developmental defect characterized by missing digits, fusion of remaining digits, and a deep median cleft in the hands and feet. Cytogenetic studies of deletions and translocations associated with this disorder have indicated that an autosomal dominant split hand/split foot locus (gene SHFD1) maps to 7q21-q22. To characterize the SHFD1 locus, somatic cell hybrid lines were constructed from cytogenetically abnormal individuals with SHFD. Molecular analysis resulted in the localization of 93 DNA markers to one of 10 intervals surrounding the SHFD1 locus. The translocation breakpoints in four SHFD patients were encompassed by the smallest region of overlap among the SHFD-associated deletions. The order of DNA markers in the SHFD1 critical region has been defined as PON–D7S812–SHFD1–D7S811–ASNS. One DNA marker, D7S811, detected altered restriction enzyme fragments in three patients with translocations when examined by pulsed-field gel electro-phoresis (PFGE). These data map SHFD1, a gene that is crucial for human limb differentiation, to a small interval in the q21.3-q22.1 region of human chromosome 7. 相似文献
26.
Partial sequencing and mapping of clones from two maize cDNA libraries 总被引:11,自引:0,他引:11
27.
Desmond C. Raitt Rosemary E. Bradshaw Tim M. Pillar 《Molecular & general genetics : MGG》1994,242(1):17-22
The cytochrome c gene (cycA) of the filamentous fungus Aspergillus nidulans has been isolated and sequenced. The gene is present in a single copy per haploid genome and encodes a polypeptide of 112 amino acid residues. The nucleotide sequence of the A. nidulans cycA gene shows 87% identity to the DNA sequence of the Neurospora crassa cytochrome c gene, and approximately 72% identity to the sequence of the Saccharomyces cerevisiae iso-1-cytochrome c gene (CYC1). The S. cerevisiae CYC1 gene was used as a heterologous probe to isolate the homologous gene in A. nidulans. The A. nidulans cytochrome c sequence contains two small introns. One of these is highly conserved in terms of position, but the other has not been reported in any of the cytochrome c genes so far sequenced. Expression of the cycA gene is not affected by glucose repression, but has been shown to be induced approximatly tenfold in the presence of oxygen and three- to fourfold under heatshock conditions. 相似文献
28.
29.
Suzanne A. Adjoa Claude Bouchard Pieter Coetzer Tim D. Noakes France T. Dionne 《Human genetics》1994,93(3):347-348
A DNA polymorphism of the nuclear-encoded subunit Va of the human cytochrome c oxidase (COX), a mitochondrial respiratory enzyme, is reported. No polymorphism was detected in genes for the subunits IV and Vb of the same enzyme. 相似文献
30.