全文获取类型
收费全文 | 1974篇 |
免费 | 76篇 |
国内免费 | 2篇 |
专业分类
耳鼻咽喉 | 19篇 |
儿科学 | 113篇 |
妇产科学 | 49篇 |
基础医学 | 175篇 |
口腔科学 | 27篇 |
临床医学 | 96篇 |
内科学 | 326篇 |
皮肤病学 | 35篇 |
神经病学 | 117篇 |
特种医学 | 206篇 |
外科学 | 405篇 |
综合类 | 38篇 |
预防医学 | 94篇 |
眼科学 | 130篇 |
药学 | 130篇 |
中国医学 | 12篇 |
肿瘤学 | 80篇 |
出版年
2024年 | 7篇 |
2023年 | 15篇 |
2022年 | 48篇 |
2021年 | 63篇 |
2020年 | 33篇 |
2019年 | 31篇 |
2018年 | 57篇 |
2017年 | 28篇 |
2016年 | 36篇 |
2015年 | 51篇 |
2014年 | 76篇 |
2013年 | 77篇 |
2012年 | 121篇 |
2011年 | 140篇 |
2010年 | 67篇 |
2009年 | 48篇 |
2008年 | 111篇 |
2007年 | 112篇 |
2006年 | 77篇 |
2005年 | 82篇 |
2004年 | 66篇 |
2003年 | 77篇 |
2002年 | 65篇 |
2001年 | 52篇 |
2000年 | 50篇 |
1999年 | 49篇 |
1998年 | 14篇 |
1997年 | 10篇 |
1996年 | 6篇 |
1995年 | 9篇 |
1993年 | 8篇 |
1992年 | 22篇 |
1991年 | 33篇 |
1990年 | 23篇 |
1989年 | 44篇 |
1988年 | 29篇 |
1987年 | 24篇 |
1986年 | 28篇 |
1985年 | 19篇 |
1984年 | 14篇 |
1983年 | 16篇 |
1982年 | 12篇 |
1981年 | 7篇 |
1980年 | 11篇 |
1979年 | 15篇 |
1978年 | 14篇 |
1977年 | 9篇 |
1973年 | 7篇 |
1971年 | 6篇 |
1970年 | 4篇 |
排序方式: 共有2052条查询结果,搜索用时 11 毫秒
31.
Asiimwe C Gelvin D Lee E Ben Amor Y Quinto E Katureebe C Sundaram L Bell D Berg M 《The American journal of tropical medicine and hygiene》2011,85(1):26-33
Quality health management requires timely and accurate data, and paper-based reporting does not fill this role adequately. The introduction of malaria rapid diagnostic tests and the availability of wireless communications present an opportunity to open direct data transmission and feedback between peripheral health workers and central managers. In November 2009, the Uganda Ministry of Health deployed a short message service-based reporting system in two districts. At a set-up cost of $100/health facility, local technician support of $ 400 per month, and a cost of $0.53/week/clinic, the SMS reporting system was started at more than 140 clinics. Positivity rates for rapid diagnostic tests and artemisinin combination therapy stock outs were 48% and 54% in Kabale and 71% and 54% in Gulu, among other reports, at more than 85% health facilities reporting weekly and without monetary incentives or additional supervision. The SMS-based reporting systems have potential to improve timeliness in reporting of specific, time-sensitive metrics at modest cost, while by-passing current bottlenecks in the flow of data. With the development of specific capacity to manage stock data at district level, the availability of timely data offers potential to address commodity distribution problems and reduce stock-outs. 相似文献
32.
Giant cell arteritis mimicking a testicular tumour 总被引:2,自引:0,他引:2
Giant cell arteritis involving the testis was identified incidentally upon orchidectomy of a right testicular mass. The mass looked like a malignant process on ultrasound. The patient also had generalised disease and was treated appropriately. Giant cell arteritis involving the bladder, prostate, uterus, and adnexa have been described before. To our knowledge, this is the first described case of giant cell arteritis affecting the testis. 相似文献
33.
34.
ObjectiveTo identify the possible antiplasmodial drugs from bacteria associated with marine sponge Stylissa carteri (S. carteri).MethodsThe S. carteri samples were collected from Thondi coast and subjected for enumeration and isolation of associated bacteria. Filter sterilized extracts (100, 50, 25, 12.5, 6.25 and 3.125 μ g/mL) from isolated bacterial strains were screened for antiplasmodial activity against Plasmodium falciparum (P. falciparum) and potential extracts were also screened for biochemical constituents.ResultsTwelve samples of S. carteri were collected and subjected for enumeration and isolation of associated bacteria. The count of bacterial strains were maximum in November 2007 (34 × 104 CFU/g) and the average count was maximum during the monsoon season (203 × 103 CFU/g). Thirty two morphologically different bacterial strains were isolated from S. carteri and the ethyl acetate bacterial extracts were screened for antiplasmodial activity against P. falciparum. The antiplasmodial activity of a strain THB17 (IC50 20.56 μ g/mL) extract is highly comparable with the positive control chloroquine (IC50 19.59 μ g/mL) and 13 bacterial extracts which showed IC50 value of more than 100 μ g/mL. Statistical analysis reveals that, significant in vitro antiplasmodial activity (P<0.05) was observed between the concentrations and time of exposure. The chemical injury to erythrocytes showed no morphological changes in erythrocytes by the ethyl acetate extract of bacterial strains after 48 h of incubation. The in vitro antiplasmodial activity might be due to the presence of reducing sugars and alkaloids in the ethyl acetate extracts of bacterial strains.ConclusionsThe ethyl acetate extract of THB17 possesses lead compounds for the development of antiplasmodial drugs. 相似文献
35.
36.
Vasanthi S Padmavathy BK Gopal R Sundaram RS Manoharan G 《Indian journal of medical microbiology》2002,20(3):165-166
Five patients with HIV associated cutaneous cryptococcal infection are reported. 相似文献
37.
To determine the utility of dystrophin and utrophin staining in the differential diagnosis of childhood muscular dystrophy. Fifty muscle biopsies of histologically confirmed cases of childhood muscular dystrophy, below 16 years of age, were stained immunohistochemically for dystrophin and utrophin. All the 30 muscle biopsies of patients with Duchenne muscular dystrophy (DMD) showed all or majority of muscle fibers deficient for dystrophin and positive for utrophin. In the 4 female DMD carriers there was mosaic pattern of staining for dystrophin and reciprocal positivity for utrophin. All the muscle biopsies of patients with other childhood onset muscular dystrophies were positive for dystrophin and negative for utrophin. This study shows that dystrophin staining differentiates DMD and DMD carriers from other childhood muscular dystrophies and utrophin staining is of no added value. Utrophin up-regulation may compensate for structural deficiency in dystrophic muscle. 相似文献
38.
Priya Rajendran Sitara Swarna Rao Ajjampur Divya Chidambaram Gunasekaran Chandrabose Bhuvaneswari Thangaraj Rajiv Sarkar Prasanna Samuel Deva Prasanna Rajan Gagandeep Kang 《Diagnostic microbiology and infectious disease》2010
The prevalence of diarrheagenic Escherichia coli (DEC) in children under 5 years was studied in children with diarrhea and controls in South India. Four polymerase chain reaction (PCR) “schemes” were used to detect genes of the 6 pathotypes of DEC. In 394 children with diarrhea, 203 (52%) DEC infections were found. Among the 198 controls, 126 (63%) DEC infections were found. Enteroaggregative E. coli was the most common pathotype by multiplex PCR both in cases (58, 14.7%) and controls (47, 23.7%), followed by enteropathogenic E. coli seen in 10% cases and 8% of controls. Enterotoxigenic E. coli (ETEC), enterohemorrhagic E. coli (EHEC), enteroinvasive E. coli (EIEC), and diffusely adherent E. coli (DAEC) were found in 4.1%, 2.0%, 1.0%, and 0.5% of cases, respectively. ETEC was found in 2.5% of controls, but EHEC, EIEC, and DAEC were not detected. Overall, no single assay worked well, but by discounting genes with a pathogenicity index of less than 1, it was possible to use the PCR assays to identify DEC in 75/394 (19%) cases and 12/198 (6.1%) controls, while mixed infection could be identified in 8/394 (2%) cases and 2/198 (1%) controls. 相似文献
39.
Bo Zhang Yan Zhou Nan Lin Rebecca F. Lowdon Chibo Hong Raman P. Nagarajan Jeffrey B. Cheng Daofeng Li Michael Stevens Hyung Joo Lee Xiaoyun Xing Jia Zhou Vasavi Sundaram GiNell Elliott Junchen Gu Taoping Shi Philippe Gascard Mahvash Sigaroudinia Thea D. Tlsty Theresa Kadlecek Arthur Weiss Henriette O’Geen Peggy J. Farnham Cécile L. Maire Keith L. Ligon Pamela A.F. Madden Angela Tam Richard Moore Martin Hirst Marco A. Marra Baoxue Zhang Joseph F. Costello Ting Wang 《Genome research》2013,23(9):1522-1540
40.
Priya M Miranda Viswanathan Mohan Sekhar Ganthimathy Ranjit M Anjana S Gunasekaran Venkatachalam Thiagarajan Thomas A Churchill Tatsuya Kin AM James Shapiro Jonathan RT Lakey 《Islets》2013,5(5):188-195
The aim of this study was to assess recovery, cell death, and cell composition of post-thaw cultured human islets. Cryopreserved islets were provided by the Clinical Islet Transplant Program, Edmonton, Canada. Islets were processed using media prepared in accordance with Pre-Edmonton and Edmonton protocols. Cryopreserved islets were rapidly thawed and cultured for 24 h, 3 d, 5 d, and 7 d, following which they were processed for histology. Islet quantification, integrity, morphology and tissue turnover were studied via hematoxylin and eosin stained sections. Ultrastructure was studied by electron microscopy and endocrine cell composition by immunohistochemistry. Using the Pre-Edmonton protocol, islet recovery was 50.1% and islet survival was 50% at 24 h while for the Edmonton protocol, the islet recovery was 69.4% (p < 0.001) and islet survival, 50% at ≈2.5 d. With an increasing culture duration although the physical integrity was retained there was an increasing loss of cohesivity both at light microscopic and at ultrastructure level regardless of the protocols used. Percentage islet survival and tissue turnover correlated negatively with culture duration in both protocols. The Edmonton protocol appears to preserve the islets better. However, culture duration adversely affects islet survival and quality, indicating the need for more optimal cryopreservation and culture techniques. 相似文献