首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   27910篇
  免费   1254篇
  国内免费   207篇
耳鼻咽喉   420篇
儿科学   985篇
妇产科学   898篇
基础医学   1739篇
口腔科学   285篇
临床医学   1494篇
内科学   7950篇
皮肤病学   403篇
神经病学   2687篇
特种医学   553篇
外科学   3708篇
综合类   1704篇
一般理论   1篇
预防医学   1854篇
眼科学   588篇
药学   985篇
  4篇
中国医学   2288篇
肿瘤学   825篇
  2024年   36篇
  2023年   488篇
  2022年   1279篇
  2021年   1409篇
  2020年   1134篇
  2019年   2570篇
  2018年   2707篇
  2017年   1142篇
  2016年   608篇
  2015年   636篇
  2014年   2004篇
  2013年   1884篇
  2012年   1455篇
  2011年   1728篇
  2010年   1414篇
  2009年   1032篇
  2008年   1017篇
  2007年   1011篇
  2006年   815篇
  2005年   624篇
  2004年   515篇
  2003年   397篇
  2002年   349篇
  2001年   244篇
  2000年   185篇
  1999年   182篇
  1998年   161篇
  1997年   168篇
  1996年   136篇
  1995年   142篇
  1994年   101篇
  1993年   121篇
  1992年   56篇
  1991年   71篇
  1990年   50篇
  1988年   50篇
  1987年   28篇
  1985年   152篇
  1984年   191篇
  1983年   149篇
  1982年   133篇
  1981年   140篇
  1980年   99篇
  1979年   92篇
  1978年   71篇
  1977年   61篇
  1976年   67篇
  1975年   63篇
  1974年   65篇
  1973年   52篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
21.
目的综述蛋白质因子在骨改建过程中的作用及机制,为进一步阐明骨相关疾病的发病机制及临床治疗提供理论依据。方法广泛查阅国内外近年相关研究成果,并加以分析、归纳和总结。结果骨改建是维持骨稳态的重要生理过程,蛋白作为骨改建过程中的重要刺激因子,调控着骨吸收与骨形成之间的平衡。结论目前对于蛋白在骨改建过程中的作用机制研究还不够充分,因此需要进一步深入研究相关蛋白在骨改建过程中的具体作用时间、作用过程以及蛋白质因子间相互作用网络,并确证其在骨改建中的作用机制,为骨相关疾病发病机制的揭示及治疗奠定基础。  相似文献   
22.
The Latin American population has a double way of immigration, one toward the United States by proximity and another toward Spain by sociocultural affinity. This population increase is affecting organ donation and transplantation in receiving countries.

Objective

To analyze the brain death (BD) concept knowledge in the Dominican Republic immigrant population in Florida (United States) and Spain.

Method

Population under study: Population born in the Dominican Republic, resident in Florida (United States) and in Spain. Inclusion criteria: Population older than 15 years stratified by age and sex. Assessment instrument: Donation attitude questionnaire PCID-DTO-Ríos. Fieldwork: Random selection based on stratification. Immigration support association collaboration in Florida and Spain was needed to locate potential respondents. Completion was anonymous and self-administered, with verbal consent.

Results

A total of 123 respondents, 57 residents in Spain and 66 in Florida, have been included in the study. The 27% (n = 33) of the respondents knowledgeable of the BD concept consider it the death of an individual. Of the remainder, 52% (n = 64) do not know about it, and the remaining 21% (n = 26) believe it does not mean the death of a patient. No differences were observed regarding migration countries (P > .05). There was no association of the BD concept with other psychosocial factors analyzed or with the attitude toward organ donation.

Conclusions

Knowledge of the BD concept among the Dominican immigrant population is similar in Spain and Florida, and, unlike most studies, there is no objective association with the attitude toward organ donation.  相似文献   
23.
24.
The actinobacterium strain ABH26 closely related to Saccharothrix xinjiangensis, isolated from an Algerian Saharan soil sample, exhibited highly antagonist activity against Gram-positive bacteria, yeasts and filamentous fungi. Its ability to produce antimicrobial compounds was investigated using several solid culture media. The highest antimicrobial activity was obtained on Bennett medium. The antibiotics secreted by strain ABH26 on Bennett medium were extracted by methanol and purified by reverse-phase HPLC using a C18 column. The chemical structures of the compounds were determined after spectroscopic (1H NMR, 13C NMR, 1H-1H COSY and 1H-13C HMBC spectra), and spectrometric (mass spectrum) analyses. Two new cyanogriside antibiotics named cyanogriside I (1) and cyanogriside J (2), were characterized along with three known caerulomycins, caerulomycin A (3), caerulomycin F (4) and caerulomycinonitrile (5). This is the first report of cyanogrisides and caerulomycins production by a member of the Saccharothrix genus. The minimum inhibitory concentrations (MIC) of these antibiotics were determined against pathogenic microorganisms.  相似文献   
25.
26.
27.
Zusammenfassung In Deutschland leiden 25% der über 70-Jährigen unter einem Diabetes mellitus. Biologisch ältere, multimorbide und in ihren Funktionen beeinträchtigte geriatrische Patienten benötigen spezielle Vorgehensweisen bei Zielplanung, Allgemeinmaßnahmen und Pharmakotherapie. Auf der Basis der vorhandenen Leitlinien werden gesicherte Erkenntnisse dargestellt und Empfehlungen zu den Besonderheiten der Therapie des geriatrischen Diabetespatienten gegeben. Besonderes Augenmerk liegt dabei auf der Interaktion von geriatrischen Syndromen und Diabetes sowie der Verbesserung der Lebensqualität.  相似文献   
28.
Many health-related research studies among Seventh-day Adventists (SDA) were published since 1958. Californian and Norwegian studies have shown that SDA have lower coronary mortality rates than the general population. This finding is usually attributed to the lifestyle advocated by the Seventh-day Adventist church with greater physical activity, lower median BMI, abstention from use of alcohol and tobacco, food habits characterized by a large intake of fruits, vegetables, cereal fiber, unsaturated fatty acids and a low consumption of saturated fats. The results about cancer incidence were discussed. Californian studies have shown significantly decreased relative risk in SDA than in the general population. Japanese studies have also reported lower risk of cancers in men with lifestyles similar to those of SDA. By contrast the Norwegian study of SDA has shown that the risk of cancer seems to be similar to that of the general population. Some studies reported a greater prevalence of type 2 diabetes in the non vegetarian SDA than the vegetarian. Compared with vegetarian, non vegetarian SDA reported more medication use, more chronic diseases, more hospitalizations and surgeries. Lifestyle choices of SDA as above described could prevent a great many coronary artery disease and type 2 diabetes. This lifestyle is now emphasized by French PNNS.  相似文献   
29.
针刺配合穴位注射治疗中风后遗症78例临床观察   总被引:4,自引:1,他引:3  
用穴位注射复方丹参注射液配合针刺的方法治疗恢复期及后遗症期中风病78例,总有效率达96%,并与单纯用针刺治疗73例疗效比较,发现穴位注射复方丹参注射液配合针刺的疗效优于单纯针刺治疗,经统计学处理,有显著性差异P<0·01。  相似文献   
30.
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号