全文获取类型
收费全文 | 3429篇 |
免费 | 497篇 |
国内免费 | 23篇 |
专业分类
耳鼻咽喉 | 32篇 |
儿科学 | 98篇 |
妇产科学 | 68篇 |
基础医学 | 381篇 |
口腔科学 | 91篇 |
临床医学 | 432篇 |
内科学 | 894篇 |
皮肤病学 | 68篇 |
神经病学 | 176篇 |
特种医学 | 332篇 |
外科学 | 295篇 |
综合类 | 57篇 |
预防医学 | 630篇 |
眼科学 | 58篇 |
药学 | 179篇 |
中国医学 | 2篇 |
肿瘤学 | 156篇 |
出版年
2023年 | 56篇 |
2022年 | 22篇 |
2021年 | 33篇 |
2020年 | 53篇 |
2019年 | 33篇 |
2018年 | 71篇 |
2017年 | 44篇 |
2016年 | 62篇 |
2015年 | 73篇 |
2014年 | 128篇 |
2013年 | 165篇 |
2012年 | 122篇 |
2011年 | 129篇 |
2010年 | 103篇 |
2009年 | 132篇 |
2008年 | 118篇 |
2007年 | 177篇 |
2006年 | 160篇 |
2005年 | 149篇 |
2004年 | 142篇 |
2003年 | 103篇 |
2002年 | 85篇 |
2001年 | 91篇 |
2000年 | 73篇 |
1999年 | 96篇 |
1998年 | 91篇 |
1997年 | 111篇 |
1996年 | 100篇 |
1995年 | 78篇 |
1994年 | 78篇 |
1993年 | 70篇 |
1992年 | 64篇 |
1991年 | 43篇 |
1990年 | 58篇 |
1989年 | 68篇 |
1988年 | 60篇 |
1987年 | 63篇 |
1986年 | 63篇 |
1985年 | 63篇 |
1984年 | 31篇 |
1983年 | 38篇 |
1982年 | 38篇 |
1981年 | 52篇 |
1980年 | 33篇 |
1979年 | 39篇 |
1978年 | 22篇 |
1977年 | 33篇 |
1976年 | 34篇 |
1975年 | 29篇 |
1974年 | 23篇 |
排序方式: 共有3949条查询结果,搜索用时 15 毫秒
31.
32.
Infections due to Yersinia enterocolitica serotypes O:2,3 and O:4 acquired in South Florida.
下载免费PDF全文
![点击此处可从《Journal of clinical microbiology》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Four recent cases of Yersinia enterocolitica infections from Florida are discussed. Two of the cases presented as acute mesenteric lymphadenitis, and the other two presented as septicemia. Three of the isolates were an uncommon serotype, O:2,3, and the fourth was serotype O:5. The increasing occurrence of Y. enterocolitica in semitropical areas of the United States is emphasized. 相似文献
33.
Association of DLG5 R30Q variant with inflammatory bowel disease 总被引:6,自引:0,他引:6
Daly MJ Pearce AV Farwell L Fisher SA Latiano A Prescott NJ Forbes A Mansfield J Sanderson J Langelier D Cohen A Bitton A Wild G Lewis CM Annese V Mathew CG Rioux JD 《European journal of human genetics : EJHG》2005,13(7):835-839
Crohn's disease (CD) and ulcerative colitis (UC) are chronic inflammatory diseases of the gastrointestinal system known as the inflammatory bowel diseases (IBD). Recently, Stoll and colleagues reported a novel finding of genetic variation in the DLG5 gene that is associated with IBD (CD and UC combined). We present here a study of the genetic variation described in that report in two well-powered, independent case-control cohorts and one family-based collection, and confirm the proposed association between IBD and the R30Q variant of DLG5 in two of the three studies. We are, however, unable to replicate the other proposed association to the common haplotype described in Stoll et al and suggest that this other finding could conceivably have been partially a statistical fluctuation and partially a result of LD with the replicated R30Q association. This study provides support for the hypothesis that DLG5 constitutes a true IBD risk factor of modest effect. 相似文献
34.
Cholecystokinin-decreased food intake in rhesus monkeys 总被引:1,自引:0,他引:1
35.
Fugger EF; Black SH; Keyvanfar K; Schulman JD 《Human reproduction (Oxford, England)》1998,13(9):2367-2370
The world's first deliveries of normal babies after use of flow cytometric
separated human sperm cells (MicroSort) for preconception gender selection
are reported. Offspring were of the desired female gender in 92.9% of the
pregnancies. Most of these pregnancies and births were achieved after
simple intrauterine insemination.
相似文献
36.
Horne G; Jamaludin A; Critchlow JD; Falconer DA; Newman MC; Oghoetuoma J; Pease EH; Lieberman BA 《Human reproduction (Oxford, England)》1998,13(11):3045-3048
Insemination with donor spermatozoa is an integral part of infertility
treatment. For the last 3 years in our unit, intrauterine insemination with
donor spermatozoa (IUID) has been used in preference to vaginal
insemination. In this retrospective study, patients were offered an initial
course of five single intrauterine inseminations with cryopreserved donor
spermatozoa and treatment was then reviewed. A total of 389 patients
received 1465 inseminations. In all, 1119 cycles were monitored using
luteinizing hormone serum analyses and 346 cycles using the urine home test
kits. The clinical pregnancy rate per insemination for the cycles monitored
by the serum assay was 18.0% (202/1119) compared with the urine cycles
(13.7%, 46/346) (P <05). The pregnancy loss rate was not significantly
different (14.4%, 29/202 and 21.7%, 10/46) (serum and urine cycles
respectively). The viable clinical pregnancy rate was significantly higher
(P <03) for the serum cycles than for the cycles using the urinary
monitoring (15.5%, 173/1119 and 10.4%, 36/346 respectively). The cycles
monitored by serum assay had a significantly higher cumulative viable
clinical pregnancy rate (P <0001) of 70.2% after nine inseminations
compared with the urine monitored cycles of 54.8%. The majority of patients
opted for the serum cycles, with a minority self-selecting the urine cycles
mainly for travelling convenience. The explanation for the significant
differences between the viable clinical pregnancy rates per insemination
and the cumulative viable clinical pregnancy rates may be due to the
sensitivity of the urine home test kit or the patients' interpretation of
the result.
相似文献
37.
Recessively inherited L-DOPA-responsive parkinsonism in infancy caused by a point mutation (L205P) in the tyrosine hydroxylase gene 总被引:4,自引:0,他引:4
38.
Gordon M. Dickinson Timothy J. Cleary Tamara Sanderson Michael R. McGinnis 《Journal of clinical microbiology》1983,17(1):155-158
A case of subcutaneous phaeohyphomycosis in a human, involving the ankle and caused by Scytalidium lignicola, is described. The isolate was found to be sensitive to amphotericin B, 5-fluorocytosine, miconazole, and ketoconazole in vitro. 相似文献
39.
Banerjee M Sanderson JD Spencer J Dunn-Walters DK 《Mechanisms of ageing and development》2000,115(1-2):85-99
It is thought that senescence of the immune system is responsible, at least in part, for many health problems associated with ageing. Previous studies on changes in lymphocyte composition have used flow cytometry to study peripheral blood lymphocytes (PBL's), or cells isolated from rodent tissue, and have yielded conflicting results. We have used immunohistochemistry to determine whether the B and T cells in human tissue from spleen and gut are affected by age. Areas of germinal centre, mantle zone and marginal zone of B cell follicles were measured. In addition, CD4 and CD8 T cells in T cell areas and in B cell follicles were counted. We observed a striking age-related decrease in the proportion of CD8+ T cells in the T cell zones of the spleen. This decrease was not apparent in the T cell population that occupies splenic B cell areas, or in GALT. Further differences, in CD4+ cells, were seen between T cell populations in the T cell zones and those in B cell areas. These findings highlight differences between lymphocyte populations in different lymphoid tissues, and different compartments within each tissue, which may be of importance in future studies of the ageing immune system. 相似文献
40.