全文获取类型
收费全文 | 17014篇 |
免费 | 1101篇 |
国内免费 | 22篇 |
专业分类
耳鼻咽喉 | 167篇 |
儿科学 | 641篇 |
妇产科学 | 671篇 |
基础医学 | 2100篇 |
口腔科学 | 232篇 |
临床医学 | 2800篇 |
内科学 | 2918篇 |
皮肤病学 | 344篇 |
神经病学 | 1417篇 |
特种医学 | 270篇 |
外科学 | 1532篇 |
综合类 | 311篇 |
一般理论 | 17篇 |
预防医学 | 2141篇 |
眼科学 | 370篇 |
药学 | 1021篇 |
中国医学 | 20篇 |
肿瘤学 | 1165篇 |
出版年
2024年 | 17篇 |
2023年 | 111篇 |
2022年 | 184篇 |
2021年 | 412篇 |
2020年 | 304篇 |
2019年 | 398篇 |
2018年 | 426篇 |
2017年 | 319篇 |
2016年 | 362篇 |
2015年 | 414篇 |
2014年 | 561篇 |
2013年 | 837篇 |
2012年 | 1303篇 |
2011年 | 1409篇 |
2010年 | 739篇 |
2009年 | 599篇 |
2008年 | 1185篇 |
2007年 | 1235篇 |
2006年 | 1146篇 |
2005年 | 1167篇 |
2004年 | 1112篇 |
2003年 | 1060篇 |
2002年 | 862篇 |
2001年 | 114篇 |
2000年 | 105篇 |
1999年 | 101篇 |
1998年 | 173篇 |
1997年 | 169篇 |
1996年 | 115篇 |
1995年 | 93篇 |
1994年 | 98篇 |
1993年 | 90篇 |
1992年 | 69篇 |
1991年 | 64篇 |
1990年 | 62篇 |
1989年 | 58篇 |
1988年 | 48篇 |
1987年 | 37篇 |
1986年 | 50篇 |
1985年 | 44篇 |
1984年 | 66篇 |
1983年 | 54篇 |
1982年 | 56篇 |
1981年 | 44篇 |
1980年 | 51篇 |
1979年 | 38篇 |
1978年 | 29篇 |
1977年 | 22篇 |
1976年 | 17篇 |
1972年 | 17篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
991.
The advent of the newly evolving field of Integrative Medicine has provided women with an opportunity to expand the health care resources available to prevent and treat mental health conditions. Aided by evidence-based science, practitioners can now broaden the scope of their therapeutic armamentarium and allow women to use the best of what western and complementary medicine has to offer in the field of mental health care. Acupuncture, medication, herbalism, and guided imagery are included in a list of therapeutic modalities designed to augment traditional care. It is clear that by providing such comprehensive care, a woman's physical and mental wellness and her longevity are optimized. 相似文献
992.
BACKGROUND: A new 0.5% fluorouracil cream has been developed that provides an alternative to the more highly concentrated topical formulations of fluorouracil that are currently available. OBJECTIVE: This was a comparison of the tolerability and efficacy of the 0.5% and 5% fluorouracil creams in the treatment of actinic keratosis (AK). METHODS: During this single-blind, randomized study, patients with > or =6 AK lesions were treated for 4 weeks with the 0.5% (once daily) and 5% (twice daily) fluorouracil creams applied to opposite sides of the face. After the end of treatment, patients were followed for an additional 4 weeks. Efficacy variables included absolute and percent reductions in AK lesions from baseline and total clearance of AK lesions. A questionnaire was used to evaluate patients' treatment preferences. Tolerability was evaluated through continuous monitoring of adverse events. RESULTS: Treatment with 0.5% fluorouracil cream reduced the number of AK lesions from 11.3 at baseline to 2.5 at the end of the 4-week follow-up phase, compared with a reduction from 10.3 to 4.2 lesions after treatment with 5% fluorouracil cream. The reduction was significantly greater with the 0.5% cream compared with the 5% cream (P = 0.044). The 0.5% cream was as effective as the 5% cream in terms of the percent reduction in AK lesions from baseline (67% and 47%, respectively) and in achieving total clearance of AK lesions (both treatments, approximately 43% of patients). Both treatments were associated with similar degrees of investigator-rated irritation; however, patients preferred the 0.5% cream because they felt it was more tolerable (P = 0.003), easier to apply, and had a once-daily application schedule. Although all patients experienced facial irritation in association with both creams, fewer patients treated with the 0.5% cream reported symptoms of facial irritation. CONCLUSIONS: In this study, 0.5% fluorouracil cream once daily was at least as effective as 5% fluorouracil cream twice daily in terms of the percent reduction in AK lesions and total clearance of AK lesions; it was more effective than the 5% cream in reducing the absolute number of AK lesions from baseline. Patients preferred the 0.5% cream to the 5% cream. 相似文献
993.
The Diabetes Prevention Program: recruitment methods and results 总被引:11,自引:0,他引:11
Rubin RR Fujimoto WY Marrero DG Brenneman T Charleston JB Edelstein SL Fisher EB Jordan R Knowler WC Lichterman LC Prince M Rowe PM;DPP Research Group 《Controlled clinical trials》2002,23(2):157-171
The Diabetes Prevention Program (DPP) is a multicenter randomized controlled trial designed to test whether diet and exercise or medication can prevent or delay the onset of type 2 diabetes in persons with impaired glucose tolerance, who are at increased risk of the disease. This paper describes DPP recruitment methods, strategies, performance, and costs. The DPP developed an organizational structure for comprehensive management and continuous monitoring of recruitment efforts. The DPP utilized a variety of recruitment strategies, alone or in combination, and a stepped informed consent procedure leading to randomization. Studywide and clinic-specific recruitment data were monitored, analyzed, and used to modify recruitment approaches. DPP recruitment was completed slightly ahead of schedule, meeting goals for the proportion of women enrolled and nearly meeting goals for the proportion of racial/ethnic minorities. Clinics varied widely in the recruitment strategies they used, and these strategies also varied by participant age, gender, and race/ethnicity. Staff time devoted to recruitment averaged 86.8 hours per week per clinic, with the majority of effort by staff specifically assigned to recruitment. The number of staff hours required to recruit a participant varied by recruitment strategy. Recruitment cost (excluding staff cost) was about 1075 US dollars per randomized participant. The DPP experience offers lessons for those planning similar efforts: (1) a method for ongoing assessment and revision of recruitment strategies is valuable; (2) a range of recruitment strategies may be useful; (3) the most effective methods for recruiting potential subjects may vary according to the gender, age, and race/ethnicity of those individuals; (4) recruitment strategies vary in the amount of staff time required to randomize a participant; and (5) a stepped screening may make it easier to identify and recruit volunteers who understand the requirements of the study. 相似文献
994.
Klocke FJ Baird MG Lorell BH Bateman TM Messer JV Berman DS O'Gara PT Carabello BA Russell RO Cerqueira MD St John Sutton MG DeMaria AN Udelson JE Kennedy JW Verani MS Williams KA Antman EM Smith SC Alpert JS Gregoratos G Anderson JL Hiratzka LF Faxon DP Hunt SA Fuster V Jacobs AK Gibbons RJ Russell RO;American College of Cardiology;American Heart Association;American Society for Nuclear Cardiology 《Journal of the American College of Cardiology》2003,42(7):1318-1333
995.
Lee J Mustafa T McDowall SG Mendelsohn FA Brennan M Lew RA Albiston AL Chai SY 《The Journal of pharmacology and experimental therapeutics》2003,305(1):205-211
The decapeptide LVV-hemorphin-7 binds with high affinity to the angiotensin IV (Ang IV) receptor (AT(4) receptor), eliciting a number of physiological effects, including cellular proliferation and memory enhancement. We have recently shown that the AT(4) receptor is identical to insulin-regulated aminopeptidase (IRAP) and that both LVV-hemorphin-7 and Ang IV inhibit the catalytic activity of IRAP. In the current study, a series of alanine-substituted and N- or C-terminally modified analogs of LVV-hemorphin-7 were evaluated for their abilities to compete for (125)I-Ang IV binding in sheep adrenal and cerebellar membranes. Selected analogs were also analyzed for binding to recombinant human IRAP and inhibition of IRAP aminopeptidase activity. C-Terminal deletions of LVV-hemorphin-7 resulted in modest changes in affinity for IRAP, whereas deletion of the first three N-terminal residues abolished binding. Monosubstitutions of Tyr(4) and Trp(6) with alanine resulted in a 10-fold reduction in affinity. Competition binding studies using recombinant human IRAP demonstrated the same rank order of affinity as obtained for the ovine tissues. All LVV-hemorphin-7 analogs tested, except for Leu-Val-Val-Tyr, inhibit the cleavage of the synthetic substrate, leucine beta-naphthylamide, by IRAP, with K(i) values between 56 and 620 nM. We find that the Val(3) residue is crucial for LVV-hemorphin-7 binding to IRAP, whereas the C-terminal domain seems to play a minor role. The current study highlights the minimal residues necessary for binding and inhibition of IRAP and provides a basis to design peptidomimetic analogs for experimental and potentially clinical use. 相似文献
996.
BACKGROUND: Existing measures of self-reported shoulder function fail to measure effectively the full range of shoulder functioning. The classic approach for improving the reliability of a scale is adding items, but a scale with a substantial number of items imposes a large response burden on participants. A more efficient approach is to use modern psychometric methods to construct an adaptive scale in which patients respond only to items that are targeted at their level of shoulder function. METHODS: We developed a Flexilevel Scale of Shoulder Function (FLEX-SF). This scale includes three testlets that target low, medium, and high shoulder function. Scores on the testlets were equated to a common mathematical metric. DESIGN AND SUBJECTS: We developed an initial pool of 68 items. This pool was administered to 400 patients, and responses were calibrated using a rating scale model. Subsets of items were identified for an easy, medium difficulty, and hard testlet. Properties of the scale were evaluated in a 3-month longitudinal study of 200 shoulder patients. RESULTS: The FLEX-SF exhibited high reliability at both the scale level (intraclass correlation coefficient [3,1] = 0.90) and specific trait levels. The validity of the FLEX-SF was supported by its internal and external responsiveness (Guyatt responsiveness index = 1.12) and the pattern of its associations with other health status measures. CONCLUSIONS: The FLEX-SF can be used as a primary endpoint in clinical trials even when there are relatively few people in each treatment group. The scale also has excellent properties for use in clinical settings tracking individual changes over time. 相似文献
997.
998.
Follow the efforts of Moscow's Central Clinical Hospital as it prepares a project demonstration for the Magnet Nursing Services Recognition Program of the American Nurses Credentialing Center. 相似文献
999.
Dawe S Rees VW Mattick R Sitharthan T Heather N 《Journal of consulting and clinical psychology》2002,70(4):1045-1050
The effectiveness of cue exposure following a priming dose was compared with cognitive-behavioral intervention in a community sample of problem drinkers. Participants were randomly allocated to 1 of the 2 conditions and received a mean of 5.84 (SD = 2.69) sessions. A psychologist blind to treatment condition conducted an 8-month follow-up. Compared with pretreatment levels, significant decreases in alcohol consumption were evident posttreatment and maintained at follow-up for both groups. Reductions in severity of dependence, impaired control, and alcohol-related problems were also evident for both groups at follow-up. No differences in outcome associated with initial severity of alcohol dependence were apparent. The results raise the issue of the appropriateness of reserving a goal of controlled drinking for those with relatively mild alcohol problems and low alcohol dependence. 相似文献
1000.
Respiratory syncytial virus (RSV) can be difficult to manipulate in the laboratory because it produces a fragile, filamentous virion that does not bud efficiently from the cell surface and which is sensitive to purification. These properties have complicated the studies of RSV envelope protein–host cell interactions. In this paper, we have tested the ability of the RSV attachment protein, G, to complement virus attachment of a recombinant vesicular stomatitis virus (VSVΔG*), which lacks any viral attachment protein. Using an enzyme-linked immunosorbent assay (ELISA) to detect bound virus, VSVΔG* virions were shown to incorporate the RSV G protein and to bind to Hep-2 cells. Binding of RSV G protein-complemented VSVΔG* virus was inhibited by incubation with RSV-specific antibodies and by the addition of exogenous sulfated glycosaminoglycans, indicating that binding by the complemented virus exhibited the characteristics of RSV binding rather than those of VSV. These results demonstrate that complementation studies with VSVΔG* may be useful in virus–host interaction studies of the RSV G protein. 相似文献