全文获取类型
收费全文 | 10374篇 |
免费 | 561篇 |
国内免费 | 23篇 |
专业分类
耳鼻咽喉 | 80篇 |
儿科学 | 305篇 |
妇产科学 | 284篇 |
基础医学 | 1815篇 |
口腔科学 | 211篇 |
临床医学 | 999篇 |
内科学 | 1850篇 |
皮肤病学 | 169篇 |
神经病学 | 1093篇 |
特种医学 | 471篇 |
外科学 | 1255篇 |
综合类 | 88篇 |
一般理论 | 3篇 |
预防医学 | 887篇 |
眼科学 | 131篇 |
药学 | 686篇 |
中国医学 | 29篇 |
肿瘤学 | 602篇 |
出版年
2022年 | 54篇 |
2021年 | 143篇 |
2020年 | 92篇 |
2019年 | 128篇 |
2018年 | 157篇 |
2017年 | 122篇 |
2016年 | 159篇 |
2015年 | 209篇 |
2014年 | 268篇 |
2013年 | 379篇 |
2012年 | 639篇 |
2011年 | 677篇 |
2010年 | 392篇 |
2009年 | 357篇 |
2008年 | 603篇 |
2007年 | 631篇 |
2006年 | 614篇 |
2005年 | 635篇 |
2004年 | 577篇 |
2003年 | 513篇 |
2002年 | 530篇 |
2001年 | 98篇 |
2000年 | 60篇 |
1999年 | 94篇 |
1998年 | 128篇 |
1997年 | 92篇 |
1996年 | 81篇 |
1995年 | 86篇 |
1994年 | 68篇 |
1993年 | 62篇 |
1992年 | 46篇 |
1991年 | 65篇 |
1990年 | 48篇 |
1989年 | 51篇 |
1985年 | 47篇 |
1984年 | 53篇 |
1983年 | 43篇 |
1982年 | 45篇 |
1981年 | 40篇 |
1974年 | 44篇 |
1933年 | 71篇 |
1932年 | 59篇 |
1931年 | 57篇 |
1930年 | 52篇 |
1929年 | 44篇 |
1928年 | 45篇 |
1927年 | 52篇 |
1926年 | 54篇 |
1925年 | 49篇 |
1924年 | 52篇 |
排序方式: 共有10000条查询结果,搜索用时 234 毫秒
131.
Caroline Keller Marc Maillard Jean Keller Kurt Hostettmann 《Pharmaceutical biology》2013,51(7):518-525
Crude extracts of 57 species of European fungi have been tested for their bactericidal (Bacillus subtilis, Escherichia coli), fungicidal (Candida albicans, Cladosporium cucumerinum), larvicidal (Aedes aegypti), molluscicidal (Biomphalaria glabrata), antioxidant and free-radical scavenging activities. Connatine and 2(3,4-dihydroxyphenyl)glycine, two compounds with antioxidant and free-radical scavenging properties, were subsequently isolated from the methanolic extracts of Lyophyllum connatum (Tricholomataceae) and Cortinarius hercynicus (Cortinariaceae), respectively. In addition, linoleic acid was shown to be molluscicidal. 相似文献
132.
U. Ezer E. D. Misirlioglu V. Colba E. Ogoz C. Kurt 《Pediatric hematology and oncology》2013,30(7):453-458
Severe and recurrent purpura fulminans developed in a Turkish boy at 1 week of age. Initial coagulation studies performed were compatible with disseminated intravascular coagulation. Subsequent investigations showed that the patient had homozygous and his healthy parents had heterozygous protein C deficiency. The episodes of purpura fulminans were controlled by infusions of fresh frozen plasma and heparinization. Oral anticoagulant therapy was given in the symptom-free period. 相似文献
133.
Malin Antonsson Francesca Longoni Christina Einald Lina Hallberg Gabriella Kurt Kajsa Larsson 《Clinical linguistics & phonetics》2016,30(12):944-958
The aims of the study were to investigate healthy subjects’ performance on a clinical test of high-level language (HLL) and how it is related to demographic characteristics and verbal working memory (VWM). One hundred healthy subjects (20–79 years old) were assessed with the Swedish BeSS test (Laakso, Brunnegård, Hartelius, & Ahlsén, 2000) and two digit span tasks. Relationships between the demographic variables, VWM and BeSS were investigated both with bivariate correlations and multiple regression analysis. The results present the norms for BeSS. The correlations and multiple regression analysis show that demographic variables had limited influence on test performance. Measures of VWM were moderately related to total BeSS score and weakly to moderately correlated with five of the seven subtests. To conclude, education has an influence on the test as a whole but measures of VWM stood out as the most robust predictor of HLL. 相似文献
134.
Signe M. Nielsen Lise Kristensen Annette Søndergaard Kurt J. Handberg Jørgen Stenderup Niels Nørskov‐Lauritsen 《APMIS : acta pathologica, microbiologica, et immunologica Scandinavica》2014,122(10):1007-1012
Filamentous fungi cultured from respiratory tract specimens submitted to the department of clinical microbiology, Aarhus University Hospital, during 2010 were identified by morphology and by internal transcribed spacer (ITS) sequencing. Of 343 fungal isolates, discrepancies between identification methods were observed for four isolates (1.2%), while identification to species was achieved only with ITS sequencing for 16 isolates (4.7%). Filamentous fungi were isolated from 15% of cystic fibrosis (CF) respiratory samples in contrast to 2% of non‐CF samples. From CF patients, a total of nine different species were found in 188 samples from 48 patients, whereas from non‐CF patients, 24 different species were found in 155 samples from 111 patients. CF was associated with a significant overrepresentation of Aspergillus fumigatus and Scedosporium species; in contrast, the frequency of Penicillium spp. and other putative contaminants were significantly increased in non‐CF patients. The altered species variation of filamentous fungi in CF respiratory specimens is contradictory to a scenario of incidentally inhaled spores, trapped in the viscous airway mucus of these patients and subsequently expectorated; rather, our data most likely reflect both an increased prevalence and an increased proportion of truly colonizing fungi in this patient group. 相似文献
135.
136.
Kurt Stoschitzky FESC 《Fundamental & clinical pharmacology》2012,26(1):1-1
137.
Sait Demirkol M.D. Ugur Kucuk M.D. Oben Baysan M.D. Sevket Balta M.D. Turgay Celik M.D. Ibrahim Halil Kurt M.D. Hilal Olgun Kucuk M.D. Uygar Cagdas Yuksel M.D. Murat Unlu M.D. Mehmet Yokusoglu M.D. 《Echocardiography (Mount Kisco, N.Y.)》2012,29(9):1064-1070
Aims: The aim of this study is to investigate the effect of mitral stenosis (MS) on left atrial (LA) function using two‐dimensional speckle tracking echocardiography (2DSTE). Methods and Results: The study subjects consisted of 52 patients with asymptomatic MS and 52 control subjects. LA function was assessed using prototype speckle tracking software and manual tracking method. Maximal LA volume (LAVmax) and minimal LA volume (LAVmin) and LA volume before atrial contraction (LAVpre‐a) were measured. Using these volumes, LA reservoir, conduit and booster pump fuction parameters were calculated. Indexed LAVmax, LAVmin, and LAVpre‐a measurements via speckle tracking were highly correlated with manual tracing methods in both groups. Expansion index (67.8 ± 36.4 vs. 148.3 ± 44.2), diastolic emptying index (37.7 ± 12.9 vs. 58.0 ± 8.5), passive emptying (37.3 ± 14.1 vs. 70.4 ± 10.4) and passive emptying index (13.3 ± 6.3 vs. 41.3 ± 10.6) were decreased significantly in MS patients (P < 0.001). In contrast active emptying index (62.6 ± 4.1 vs. 29.5 ± 10.1) increased in MS group (P < 0.001) while active emptying (28.1 ± 13.0 vs. 28.3 ± 6.9) remained same among both groups. Conclusions: This is the first study relating LA volumes and function assessed by 2DSTE to MS. 2D speckle tracking analysis of LA volume is relatively easy and provides more detailed information regarding the changes in LA volumes during the cardiac cycle. 相似文献
138.
139.
140.
Kent Jacob Nielsen Anne H. Pedersen Kurt Rasmussen Louise Pape Kim L. Mikkelsen 《The American journal of emergency medicine》2013,31(3):504-508
ObjectiveThe purpose of this study was to investigate the relationship between 12 work-related stressors and the occurrence of adverse events in an emergency department (ED).MethodsNurses and physicians, working in an ED at a Danish regional hospital, filled out a questionnaire on occurrence and emotional impact of 12 work-related stressors after each shift during a 4-week period. The questionnaire also instructed the participants to describe any adverse events that they were involved in during the shift.ResultsTwo hundred fourteen adverse events were reported during the 979 studied shifts. During the same period, only 27 adverse events were reported to the mandatory national reporting system, and only 10 of these were duplicates. A high variability of stressors and emotional impact among the different groups of participants was found. Linear regression analysis showed an association between involvement in adverse events and the occurrence and emotional impact of stressors across groups, whereas no significant association was found for age, seniority, shift type, or length.ConclusionThe study showed an association between the occurrence and impact of 12 work-related stressors and involvement in adverse events across the groups of participants. Furthermore, the study showed that most adverse events were not reported to the mandatory national reporting system. 相似文献