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   10684篇
  免费   645篇
  国内免费   35篇
耳鼻咽喉   129篇
儿科学   266篇
妇产科学   257篇
基础医学   1521篇
口腔科学   176篇
临床医学   961篇
内科学   2527篇
皮肤病学   235篇
神经病学   987篇
特种医学   217篇
外科学   1290篇
综合类   153篇
一般理论   12篇
预防医学   740篇
眼科学   256篇
药学   929篇
中国医学   27篇
肿瘤学   681篇
  2023年   60篇
  2022年   120篇
  2021年   246篇
  2020年   116篇
  2019年   168篇
  2018年   214篇
  2017年   160篇
  2016年   202篇
  2015年   234篇
  2014年   304篇
  2013年   430篇
  2012年   609篇
  2011年   630篇
  2010年   304篇
  2009年   346篇
  2008年   579篇
  2007年   627篇
  2006年   578篇
  2005年   579篇
  2004年   575篇
  2003年   513篇
  2002年   521篇
  2001年   233篇
  2000年   211篇
  1999年   182篇
  1998年   100篇
  1997年   84篇
  1996年   81篇
  1995年   68篇
  1994年   73篇
  1993年   80篇
  1992年   156篇
  1991年   154篇
  1990年   124篇
  1989年   136篇
  1988年   126篇
  1987年   114篇
  1986年   116篇
  1985年   81篇
  1984年   89篇
  1983年   73篇
  1982年   74篇
  1981年   56篇
  1980年   53篇
  1979年   50篇
  1978年   48篇
  1977年   46篇
  1976年   44篇
  1975年   63篇
  1971年   45篇
排序方式: 共有10000条查询结果,搜索用时 11 毫秒
991.
IntroductionNursing has essentially been the work of women. The increase in men incorporating into nursing makes us think about whether there are different ways of expressing and practicing a profession in relationship to gender.ObjectiveTo describe if there are different ways of perceiving and assessing ICU work from a gender perspective.MethodologyA qualitative phenomenological study. Sample: 6 male nurses and 6 female nurses from the ICU of the Hospital Universitario de Bellvitge (HUB). Data collection: In-depth semi-constructed interview. Content analysis.ResultsMale nurses describe ICU work in terms of autonomy in making decisions and professional competence. They claim responsibility for their identity as nurses and stress the low social recognition of the profession. They prioritize the responsibility of decision making over the final outcome and evaluate family satisfaction in terms of prestige and competence. They are more practical. Female nurses describe the work in terms of control and follow-up of the patient's evolution. They emphasize the final care outcome and evaluate satisfaction in terms of a relationship of confidence and warm patient care. They are more meticulous.ConclusionsThere are differences in how they classify their ICU work, in the self-evaluation of professional identity, behavior in the development of the nursing care and in perception of family satisfaction. No differences are observed regarding problem solving with the technology.  相似文献   
992.
Individuals vary in their subjective responses to stimulant drugs, and these differences are believed to be partially genetic in origin. We evaluated associations between mood, cognitive and cardiovascular responses to d-amphetamine and four polymorphisms in the dopamine transporter (SLC6A3): rs460000, rs3756450, rs37022 and rs6869645. Healthy Caucasian male and female volunteers (N = 152) participated in a double-blind, crossover design study in which they received placebo, 10 and 20 mg of d-amphetamine. We measured self-reported rating of mood, performance on the Digit Symbol Substitution Task, blood pressure and heart rate. Individuals with the C/C genotype at rs460000 (N = 83) reported approximately twofold higher ratings of stimulation and euphoria relative to the A/A+A/C (N = 69) genotype group, at both the 10 and 20 mg doses. No other responses or SNPs showed significant effects. rs460000 is in perfect LD with rs463379 (CEU: D′ = 1; r 2 = 1), which was not studied here, but has been associated with etiology of Attention Deficit Hyperactivity Disorder (ADHD). These findings suggest a pleiotropic effect of this polymorphic locus on both ADHD and sensitivity to the subjective effects of amphetamine.  相似文献   
993.
High adenine phosphate (HAP) diet serves as an animal model of chronic renal failure (RF). Induction of RF and establishment of end organ damage require long exposure periods to this diet. Previously, we have shown that RF is reversible after diet cessation even after protracted administration. In this study, we explored the underlying renal changes and cellular pathways occurring during administration and after cessation of the diet. Kidneys were obtained from rats fed HAP diet for 7 weeks, and from rats fed HAP diet followed a 10 week recovery period on normal diet. The kidneys of HAP diet group were significantly enlarged due to tubular injury characterized by massive cystic dilatation and crystal deposition. Kidney injury was associated with markers of apoptosis as well as with activation of apoptosis related pathways. Diet cessation was associated with a significant reduction in kidney size, tubules diameter, and crystals deposition. The recovery from renal injury was coupled with regression of apoptotic features. This is the first study showing the potential reversibility of long standing RF model, allowing optimal evaluation of uremia-chronic effects.  相似文献   
994.
Two novel photoinitiator‐free approaches to photopolymerize acrylic monomers with a conventional Hg lamp starting from an acrylates monomer miniemulsion are investigated. In one system the acrylate nanodroplet reaction is self‐initiated and in the other the use of a photoactive diphenyl ether surfactant yields phenyl and phenoxyl initiating radicals upon UV irradiation. Photopolymerization kinetics are monitored in situ by real‐time Fourier transform near infrared spectroscopy (RT‐FTNIR) and the colloidal properties are systematically investigated by dynamic light scattering (DLS). The up‐scaling of these PI‐free miniemulsion photopolymerizations is carried out in an annular photoreactor.  相似文献   
995.
996.
Hypersensitivity reactions called reversal reaction (RR) and erythema nodosum leprosum (ENL) occur in leprosy. They are characterized by an increase in tumor necrosis factor-alpha (TNF-α). Thalidomide is an effective treatment for ENL but not RR. Its effectiveness in ENL is attributed to inhibition of TNF-α, and this does not explain its failure to treat RR. We assessed thalidomide's effect on TNF-α in RR. Mononuclear cells from RR and non-RR patients and healthy individuals were treated with thalidomide and M.leprae (AFB), a cytosol fraction of M. leprae or Dharmendra lepromin. Thalidomide suppressed TNF-α, but when some RR patients' cells were stimulated with AFB, it enhanced TNF-α.  相似文献   
997.
BackgroundCampylobacter spp. are one of the commonest causes of diarrhea in children under five and in resource poor settings also lead to malabsorption and stunting. The purpose of this systematic review was to understand the burden of Campylobacter spp. associated diarrhea among children in the South Asian countries.MethodsThis systematic review followed the PRISMA (Preferred Reporting Items for Systematic reviews and Meta-Analysis) guidelines. Databases were searched with defined keywords for publications from the years 1998–2018. Data on proportion of positive samples was extracted to compare the rates of Campylobacter infection among children (under the age of 19) from different study populations.ResultsOf the 359 publications screened, 27 eligible articles were included in this systematic review and categorized based on study design. In 8 case-control studies, Campylobacter spp. was detected more frequently among diarrheal cases (range, 3.2–17.4%) than non-diarrheal cases (0–13%). Although there were variations in the study population, overall, children under the age of two years experienced Campylobacter diarrhea more often than older children. Most studies reported stool culture as the method used to detect Campylobacter spp. however retesting using PCR-based methods significantly increased detection rates. Limited data were available on Campylobacter species. In 4 studies that provided species data, C. jejuni (3.2–11.2%) was shown to be the most common species, followed by C. coli.ConclusionIn South Asia, Campylobacter spp. are one of the most common bacterial diarrheal pathogens affecting children but there is a paucity of data on species, risk factors and attributable sources. Although a few studies were available, the epidemiology of campylobacteriosis remains uncertain. To understand the true burden and sources of infection, more detailed studies are needed collecting data from human, animal and environmental sources and using both culture and genomic tools.  相似文献   
998.
Journal of Thrombosis and Thrombolysis - Bleeding gastrointestinal angiodysplasia may occur in patients with vasculitis and can be challenging to treat. We describe the novel use of bevacizumab...  相似文献   
999.
1000.
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