全文获取类型
收费全文 | 3580篇 |
免费 | 300篇 |
国内免费 | 7篇 |
专业分类
耳鼻咽喉 | 45篇 |
儿科学 | 119篇 |
妇产科学 | 54篇 |
基础医学 | 565篇 |
口腔科学 | 41篇 |
临床医学 | 440篇 |
内科学 | 677篇 |
皮肤病学 | 66篇 |
神经病学 | 309篇 |
特种医学 | 74篇 |
外科学 | 487篇 |
综合类 | 26篇 |
一般理论 | 2篇 |
预防医学 | 443篇 |
眼科学 | 103篇 |
药学 | 210篇 |
中国医学 | 7篇 |
肿瘤学 | 219篇 |
出版年
2023年 | 43篇 |
2022年 | 64篇 |
2021年 | 153篇 |
2020年 | 100篇 |
2019年 | 149篇 |
2018年 | 147篇 |
2017年 | 107篇 |
2016年 | 102篇 |
2015年 | 116篇 |
2014年 | 177篇 |
2013年 | 221篇 |
2012年 | 322篇 |
2011年 | 302篇 |
2010年 | 150篇 |
2009年 | 118篇 |
2008年 | 182篇 |
2007年 | 194篇 |
2006年 | 164篇 |
2005年 | 139篇 |
2004年 | 129篇 |
2003年 | 119篇 |
2002年 | 115篇 |
2001年 | 50篇 |
2000年 | 65篇 |
1999年 | 36篇 |
1998年 | 31篇 |
1997年 | 23篇 |
1996年 | 14篇 |
1995年 | 17篇 |
1994年 | 12篇 |
1993年 | 11篇 |
1992年 | 32篇 |
1991年 | 17篇 |
1990年 | 11篇 |
1989年 | 21篇 |
1988年 | 26篇 |
1987年 | 18篇 |
1986年 | 14篇 |
1985年 | 26篇 |
1984年 | 13篇 |
1983年 | 14篇 |
1982年 | 10篇 |
1981年 | 11篇 |
1979年 | 15篇 |
1977年 | 6篇 |
1976年 | 8篇 |
1974年 | 11篇 |
1973年 | 7篇 |
1969年 | 6篇 |
1966年 | 6篇 |
排序方式: 共有3887条查询结果,搜索用时 31 毫秒
31.
32.
Lario Viljoen Virginia A. Bond Lindsey J. Reynolds Constance Mubekapi‐Musadaidzwa Dzunisani Baloyi Rhoda Ndubani Anne Stangl Janet Seeley Triantafyllos Pliakas Peter Bock Sarah Fidler Richard Hayes Helen Ayles James R. Hargreaves Graeme Hoddinott 《Sociology of health & illness》2021,43(1):167-185
Despite continued development of effective HIV treatment, expanded access to care and advances in prevention modalities, HIV‐related stigma persists. We examine how, in the context of a universal HIV‐testing and treatment trial in South Africa and Zambia, increased availability of HIV services influenced conceptualisations of HIV. Using qualitative data, we explore people’s stigma‐related experiences of living in ‘intervention’ and ‘control’ study communities. We conducted exploratory data analysis from a qualitative cohort of 150 households in 13 study communities, collected between 2016 and 2018. We found that increased availability of HIV‐testing services influenced conceptualisations of HIV as normative (non‐exceptional) and the visibility of people living with HIV (PLHIV) in household and community spaces impacted opportunities for stigma. There was a shift in community narratives towards individual responsibility to take up (assumingly) widely available service – for PLHIV to take care of their own health and to prevent onward transmission. Based on empirical data, we show that, despite a growing acceptance of HIV‐related testing services, anticipated stigma persists through the mechanism of shifting responsibilisation. To mitigate the responsibilisation of PLHIV, heath implementers need to adapt anti‐stigma messaging and especially focus on anticipated stigma. 相似文献
33.
Wen Meng Siying Guo Simon Cao Masahiro Shuda Lindsey R. Robinson-McCarthy Kevin R. McCarthy Yoko Shuda Alberto E. Paniz Mondolfi Clare Bryce Zachary Grimes Emilia M. Sordillo Carlos Cordon-Cardo Pengfei Li Hu Zhang Stanley Perlman Haitao Guo Shou-Jiang Gao Yuan Chang Patrick S. Moore 《Journal of medical virology》2023,95(1):e28246
SARS-CoV-2 NSP12, the viral RNA-dependent RNA polymerase (RdRp), is required for viral replication and is a therapeutic target to treat COVID-19. To facilitate research on SARS-CoV-2 NSP12 protein, we developed a rat monoclonal antibody (CM12.1) against the NSP12 N-terminus that can facilitate functional studies. Immunoblotting and immunofluorescence assay (IFA) confirmed the specific detection of NSP12 protein by this antibody for cells overexpressing the protein. Although NSP12 is generated from the ORF1ab polyprotein, IFA of human autopsy COVID-19 lung samples revealed NSP12 expression in only a small fraction of lung cells including goblet, club-like, vascular endothelial cells, and a range of immune cells, despite wide-spread tissue expression of spike protein antigen. Similar studies using in vitro infection also generated scant protein detection in cells with established virus replication. These results suggest that NSP12 may have diminished steady-state expression or extensive posttranslation modifications that limit antibody reactivity during SARS-CoV-2 replication. 相似文献
34.
Zhang R Cai Q Lindsey J Li Y Chambless B Naguib F 《International journal of oncology》1997,10(6):1147-1156
The DNA topoisomerase I inhibitors, 10-hydroxycamptothecin (HCPT) and camptothecin (CPT), are indole alkaloids isolated from the Chinese tree, Camptotheca acuminata. They have been shown to have a wide spectrum of anticancer activity both in vitro and in vivo. However, their use has been limited due to their water-insolubility. The purpose of the present study was 2-fold, to determine the in vitro and in vivo activity of HCPT and CPT against human breast cancer and to determine the pharmacokinetics of the two drugs to better understand how they can best be used therapeutically. The bl vitro inhibitory effect on tumor growth was observed with breast cancer cell line MDA-MB-468. The in vivo antitumor effects were then determined using severe combined immunodeficient (SCID) mice bearing MDA-MB-468 xenografts. The tumor-bearing mice were orally administered HCPT (1, 3, 6, 9 mg/kg/day, 5 days per week) or CPT (1, 3, 6 mg/kg/day, 5 days per week) for 3 weeks. Growth of the MDA-MB-468 cells was inhibited by HCPT and CPT in vitro and in vivo in a dose-dependent manner. Complete regression of the tumor xenografts, determined by tumor measurement and microscopic examination, occurred in the groups of animals treated with doses of HCPT or CPT of 3 mg/kg/day or more. In general, HCPT was more effective and less toxic than CPT. To determine the potential mechanisms for the pharmacologic differences, the comparative pharmacokinetics of HCPT and CPT were determined in tumor-bearing SCID mice following i.v. or oral administration of H-3-HCPT or H-3-CPT. Parent drugs and their metabolites in plasma, urine, feces, and various tissues were quantified by a recently developed reversed-phase HPLC method. Significant absorption of both HCPT and CPT was observed after oral administration, with CPT having a higher bioavailability. HCPT and CPT were distributed widely into various tissues including the tumor, enterohepatic system, kidneys, and bone marrow. These studies indicate that HCPT and CPT are of potential use in treatment of breast cancer, providing the basis for the design of future human trials with these anticancer drugs. 相似文献
35.
Michael J. Millward David R. Newell Kally Yuen Jane P. Matthews Kathryn Balmanno Christopher J. Charlton Lindsey Gumbrell Michael J. Lind Fiona Chapman Madeleine Proctor Dorothy Simmonds Brian M. J. Cantwell A. Hilary Calvert 《Cancer chemotherapy and pharmacology》1995,37(1-2):161-167
The pharmacokinetics and pharmacodynamics of prolonged oral etoposide chemotherapy were investigated in 15 women with metastatic breast cancer who received oral etoposide 100 mg as a single daily dose for up to 15 days. There was considerable interpatient variability in the day 1 pharmacokinetic parameters: area under the plasma concentration time curve (AUC) (0–24 h) 1.95±0.87 mg/ml per min (mean ± SD), apparent oral clearance 60.9±21.7 ml/min per 1.73 m2, peak plasma concentration 5.6±2.5 g/ml, time to peak concentration 73±35 min and half-life 220±83 min. However, intrapatient variability in systemic exposure to etoposide was much less with repeated doses. The intrapatient coefficient of variation (CV) of AUC for day 8 relative to day 1 was 20% and for day 15 relative to day 1 was 15%, compared to the day 1 interpatient CV of 45%. Neutropenia was the principal toxicity. Day 1 pharmacokinetic parameters were related to the percentage decrease in absolute neutrophil count using the sigmoidal Emax equation. A good fit was found between day 1 AUC and neutrophil toxicity (R
2=0.77). All patients who had a day 1 AUC>2.0 mg/ml per min had WHO grade III or IV neutropenia. The predictive performance of the models for neutrophil toxicity was better for AUC (percentage mean predictive error 5%, percentage root mean square error 18.1%) than apparent oral clearance, peak plasma concentration, or daily dose (mg/m2). A limited sampling strategy was developed to predict AUC using a linear regression model incorporating a patient effect. Data sets were divided into training and test sets. The AUC could be estimated using a model utilizing plasma etoposide concentration at only two time points, 4 h and 6 h after oral dosing (R
2=98.9%). The equation AUCpr=–0.376+0.631×C4h+0.336×C6h was validated on the test set with a relative mean predictive error of –0.88% and relative root mean square error of 6.4%. These results suggest monitoring of AUC to predict subsequent myelosuppression as a strategy for future trials with oral etoposide.Division of Haematology and Medical Oncology, Peter MacCallum Cancer Institute, Locked Bag 1, A'Beckett St, Melbourne 3000, Australia 相似文献
36.
Lindsey LA 《Journal of the Royal College of Surgeons of Edinburgh》1999,44(1):34-35
Surgeons' basic competency relies upon their ability to combine their existing knowledge and practical skills in the care of their patients, and also upon keeping up to date and encompassing change. We now live in a society which has become accustomed to receive a constant flow of up-to-date information about the world around it. With recent developments, including the Internet, the World Wide Web, and advances in personal computer systems, the pace of change of information technology (IT) has been increasing. These changes have had a significant impact upon surgery, and it is now becoming necessary to be able to make use of these new resources to function effectively in modern practice. This article will outline some of the more important topics relating to IT in surgical practice as an introduction to a series on this subject which will be appearing in forthcoming issues of the Journal. 相似文献
37.
The use of newly approved drugs for human immunodeficiency virus (HIV)-infected adults is limited in children until child-specific pharmacokinetic and safety data can be submitted to the Food and Drug Administration (FDA) to fulfill labeling requirements. Design of a clinical trial to assess drug safety in children requires a different set of issues from standard Phase II and III efficacy trials in adults. For example, Phase II trials in adults are done to collect preliminary efficacy information. In children, efficacy of the drug is assumed and only safety needs to be shown. As a result, control groups may not be required and it may not be necessary to show superiority of the new drug over a control. This paper describes these issues in some detail and gives examples of designs appropriate in different scenarios. 相似文献
38.
STUDY DESIGN: Case report. OBJECTIVES: To describe a fracture through the fusion mass of a spine that had been corrected previously with Cotrel-Dubousset rods. These rods had failed in bending after direct trauma. SUMMARY OF BACKGROUND DATA: Nine years after successful treatment of scoliosis with Cotrel-Dubousset instrumentation, the patient was in a motor vehicle accident and sustained a hyperextension spine injury with complete L1-L2 paraplegia and disruption of the fusion mass. The Cotrel-Dubousset instrumentation rods, which failed in bending, could not be corrected in situ, and the angulated segments had to be resected. The spine then became extremely unstable, and the patient consulted the authors for definitive stabilization. RESULTS: The spine was stabilized by attaching the proximal and distal retained Cotrel-Dubousset instrumentation to supplemental rods in a "domino" fashion. Crosslinks were added to improve the torsional stability. Intraoperatively, the fracture was well reduced, and the fixation was stable. A posterolateral fusion was performed with allogenic bone graft. CONCLUSION: Bent Cotrel-Dubousset instrumentation rods are still very strong and may not correct in situ.- If resection is required, the retained portions of Cotrel-Dubousset instrumentation can serve as attachments to restore stable fixation a "domino"technique. 相似文献
39.
This report describes a new technique for treatment of a segmental defect in long bones that uses a cylindrical titanium mesh cage, in combination with cancellous bone allograft and demineralized bone matrix putty (Grafton), stabilized with a statically locked intramedullary nail. Two clinical cases of tibia defects treated with this technique are presented. At the one-year follow-up, radiographically both cases demonstrated excellent limb alignment, stability, and bony healing. Immediate full weight-bearing was initiated in each case, and early limb functional recovery was achieved. Preliminary data suggest that this technique may be a reasonable alternative to currently used methods for management of select long bone segmental defects. 相似文献
40.