全文获取类型
收费全文 | 1094篇 |
免费 | 78篇 |
国内免费 | 5篇 |
专业分类
耳鼻咽喉 | 3篇 |
儿科学 | 43篇 |
妇产科学 | 57篇 |
基础医学 | 118篇 |
口腔科学 | 28篇 |
临床医学 | 141篇 |
内科学 | 266篇 |
皮肤病学 | 34篇 |
神经病学 | 20篇 |
特种医学 | 126篇 |
外科学 | 48篇 |
综合类 | 24篇 |
预防医学 | 56篇 |
眼科学 | 4篇 |
药学 | 50篇 |
1篇 | |
中国医学 | 3篇 |
肿瘤学 | 155篇 |
出版年
2023年 | 4篇 |
2021年 | 15篇 |
2020年 | 6篇 |
2019年 | 9篇 |
2018年 | 18篇 |
2017年 | 6篇 |
2016年 | 9篇 |
2015年 | 16篇 |
2014年 | 22篇 |
2013年 | 34篇 |
2012年 | 24篇 |
2011年 | 35篇 |
2010年 | 51篇 |
2009年 | 51篇 |
2008年 | 37篇 |
2007年 | 48篇 |
2006年 | 40篇 |
2005年 | 46篇 |
2004年 | 36篇 |
2003年 | 22篇 |
2002年 | 21篇 |
2001年 | 23篇 |
2000年 | 26篇 |
1999年 | 34篇 |
1998年 | 44篇 |
1997年 | 54篇 |
1996年 | 48篇 |
1995年 | 26篇 |
1994年 | 33篇 |
1993年 | 27篇 |
1992年 | 32篇 |
1991年 | 21篇 |
1990年 | 28篇 |
1989年 | 33篇 |
1988年 | 24篇 |
1987年 | 17篇 |
1986年 | 22篇 |
1985年 | 16篇 |
1984年 | 22篇 |
1983年 | 16篇 |
1982年 | 18篇 |
1981年 | 15篇 |
1980年 | 10篇 |
1979年 | 3篇 |
1978年 | 7篇 |
1977年 | 5篇 |
1976年 | 4篇 |
1973年 | 3篇 |
1972年 | 5篇 |
1971年 | 4篇 |
排序方式: 共有1177条查询结果,搜索用时 15 毫秒
11.
12.
Abdominal trauma: use of oral contrast material for CT is safe 总被引:2,自引:0,他引:2
13.
14.
John A. Carr B.S. Paul A. Schoon M.D. Katherine Y. Look M.D. 《Gynecologic oncology》1996,60(3):498-499
Following an abdominal hysterectomy and bilateral salpingoophorectomy wherein a superficial (1.6 mm) well-differentiated endometrial cancer and bilateral ovarian serous cystadenomas were discovered, estrogen replacement was given. One year later the patient presented with a 9 × 7-cm left groin recurrence. Patients with endometrial carcinoma may request estrogen replacement. The benefits of such replacement are well recognized; however, these patients also need to be counselled that hormonal replacement may be complicated by recurrence. Physicians need to be cognizant of symptoms or signs which would suggest disease recurrence at unusual sites in these patients who are perceived as being at low risk for recurrent disease. 相似文献
15.
16.
Novero V; Camus M; Tournaye H; Smitz J; Verheyen G; Joris H; Derde MP; Van Steirteghem AC; Devroey P 《Human reproduction (Oxford, England)》1997,12(1):59-63
Serum follicle stimulating hormone (FSH) is routinely measured when
evaluating the infertile male for intracytoplasmic sperm injection (ICSI).
However, among the sperm parameters, only its relationship with sperm
concentration is well documented. Few investigations concern the
relationship between FSH and sperm motility and morphology, and the results
of ICSI. A retrospective study of 316 couples who underwent ICSI was
carried out to determine the relationships between serum FSH concentrations
in the male and (i) standard sperm parameters_(concentration, motility and
morphology) and (ii) fertilization, cleavage, pregnancy and implantation
rates after ICSI. There was an inverse correlation with sperm concentration
and total motility but no relationship was found with progressive motility
and sperm morphology. Neither was any relationship found between serum FSH
and fertilization, cleavage, pregnancy and implantation rates, and the
results of ICSI. These findings suggest the need to review the routine
measurement of serum FSH in the infertile male when ICSI is the planned
treatment procedure.
相似文献
17.
18.
Glenn Perrigo Lee Belvin Paul Quindry Tarik Kadir Julie Becker Christine van Look John Niewoehner Frederick S. vom Saal 《Behavior genetics》1993,23(6):525-531
Infanticide is a reproductive strategy found in many mammals, especially rodents. The proportion of male and female house mice (Mus domesticus) that are either infanticidal or noninfanticidal is strain specific and varies widely from stock to stock. Male house mice also show strain-specific variation in the behavioral mechanisms that inhibit infanticidal individuals from killing their own offspring. The adult offspring generated from reciprocally crossed CF-1 and Wild stock house mice were tested for their behavior toward newborn pups. In male CF-1xWild hybrids, the proportion of infanticidal and noninfanticidal males matched with their maternal phenotype, whereas female CF-1xWild hybrids exhibited a proportion of behaviors typical of the CF-1 phenotype, regardless of their mother's genotype. Our results suggest three conclusions: first, that infanticide is a highly labile and heritable behavior in both sexes; second, that there is a sex difference in the genetic substrate that regulates the inheritance of infanticidal behavior; and third, that selection pressures in male mice may operate independently on the mechanisms that promote spontaneous infanticidal behavior versus the mechanisms that inhibit infanticide. 相似文献
19.
Detection of N-myc gene amplification by fluorescence in situ hybridization. Diagnostic utility for neuroblastoma. 总被引:4,自引:1,他引:4
下载免费PDF全文
![点击此处可从《The American journal of pathology》网站下载免费的PDF全文](/ch/ext_images/free.gif)
D. N. Shapiro M. B. Valentine S. T. Rowe A. E. Sinclair J. E. Sublett W. M. Roberts A. T. Look 《The American journal of pathology》1993,142(5):1339-1346
We assessed fluorescence in situ hybridization (FISH) as an alternative to Southern blot analysis for determination of N-myc gene amplification in neuroblastoma. In the 44 pediatric solid tumor cell lines examined (20 neuroblastomas), the mean number of N-myc copies determined by FISH correlated closely with Southern blot results. There was wide intercellular variability in gene copy number in tumors that had evidence of amplification; however, tumors judged to be non-amplified completely lacked any cells with high N-myc copy number. FISH provided reliable estimates of N-myc amplification in 12 clinical samples even when the percentage of tumor was low. The other advantages of FISH over Southern blot analysis were speed and technical simplicity, ability to discern heterogeneous gene amplification among tumor cells in the same specimen, and capacity to determine the source of the amplified N-myc signal, whether extrachromosomal double-minute chromosomes, expanded intrachromosomal regions, or chromosome 2 aneuploidy. We conclude that FISH would refine the analysis of N-myc amplification in neuroblastoma and thus improve the assignment of patients to prognostic groups based on this unfavorable risk factor. 相似文献
20.