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   2031篇
  免费   116篇
  国内免费   114篇
耳鼻咽喉   8篇
儿科学   96篇
妇产科学   30篇
基础医学   216篇
口腔科学   37篇
临床医学   281篇
内科学   477篇
皮肤病学   41篇
神经病学   106篇
特种医学   381篇
外国民族医学   1篇
外科学   148篇
综合类   49篇
一般理论   1篇
预防医学   124篇
眼科学   13篇
药学   173篇
中国医学   2篇
肿瘤学   77篇
  2021年   23篇
  2020年   20篇
  2019年   40篇
  2018年   36篇
  2017年   12篇
  2016年   28篇
  2015年   34篇
  2014年   31篇
  2013年   65篇
  2012年   49篇
  2011年   73篇
  2010年   69篇
  2009年   61篇
  2008年   53篇
  2007年   92篇
  2006年   55篇
  2005年   73篇
  2004年   34篇
  2003年   41篇
  2002年   33篇
  2001年   34篇
  2000年   42篇
  1999年   35篇
  1998年   96篇
  1997年   97篇
  1996年   112篇
  1995年   69篇
  1994年   66篇
  1993年   68篇
  1992年   22篇
  1991年   40篇
  1990年   35篇
  1989年   60篇
  1988年   55篇
  1987年   58篇
  1986年   35篇
  1985年   60篇
  1984年   23篇
  1983年   25篇
  1982年   29篇
  1981年   24篇
  1980年   34篇
  1979年   13篇
  1978年   17篇
  1977年   20篇
  1976年   36篇
  1975年   27篇
  1974年   15篇
  1972年   12篇
  1970年   18篇
排序方式: 共有2261条查询结果,搜索用时 15 毫秒
101.
102.
Objective  To evaluate the repair techniques of continuous and interrupted methods for episiotomy or perineal tears.
Design  A randomised controlled trial.
Setting  The Hospital Universitario Principe de Asturias, a state hospital belonging to the community of Madrid.
Sample  Four hundred forty-five women who had undergone vaginal deliveries with episiotomies or second-grade tearing of the perineum between September 2005 and July 2007.
Methods  One group was repaired with continuous, nonlocking sutures involving the vagina, perineum, and subcutaneous tissues. The other group had continuous, locking sutures of the vagina, interrupted sutures in the perineal muscles, and interrupted transcutaneous sutures. The threads used for stitching were identical in both groups.
Main outcome measures  The participants were questioned regarding the sensation of pain and the use of painkillers on the second and the tenth days, and 3 months postpartum.
Results  When comparing the group with continuous suture to the group with interrupted sutures, the differences included less repair time (1 minute; P = 0.017) and less suture material used (relative risk [RR], 3.2, 95% CI: 2.6–4.0). The comparison of pain on the second and tenth days, and 3 months postpartum were not statistically different between the two techniques (RR, 1.08, 95% CI: 0.74–1.57; RR, 0.96, 95% CI: 0.59–1.55; and RR, 0.68, 95% CI: 0.19–2.46, respectively).
Conclusions  Although we did not demonstrate that one technique was better than the other in the incidence of pain in the short or long term, we showed that episiotomy and perineal tear repairs with continuous suturing were quicker and used less suture material without an increase in complication than interrupted suturing.  相似文献   
103.
104.
[目的]评估北京市社区妇女人乳头瘤病毒(HPV)的感染率;调查社区人群对HPV的认知情况以及对HPV疫苗接种的态度。[方法]采用横断面调查方法,对北京市展览路社区15 ̄54岁女性进行HPV认知和流行病学问卷调查,并留取了宫颈脱落细胞或会阴部标本进行HPV DNA检测。[结果]1013名女性接受了问卷调查,832例HPV DNA检测结果纳入了统计学分析。HPV总检出率为15.38%,高、低危型HPV感染率分别为13.34%和3.25%,同时感染高、低危型HPV的检出率为1.20%。1013名调查对象中有30.7%听说过HPV,其中51.78%知道HPV感染与宫颈癌有关;HPV的知晓率与年龄和教育程度有关(P〈0.05);经过简单宣教后,75.91%愿意接种HPV疫苗。[结论]北京市社区妇女HPV现患率较高,对HPV的知晓率也较高。开展公众健康教育,提高人群的认识水平是疫苗计划获得成功的关键因素。  相似文献   
105.
Objective: To determine the immunity to hepatitis B, poliomyelitis and measles in fully vaccinated Aboriginal and Torres Strait Island children in north Queensland.
Methodology: A cross-sectional survey of immunity in a sample of children; 101 fully vaccinated Aboriginal and Torres Strait Island children, with a median age of 24.5 months, from 10 communities in North Queensland participated in this study. The main outcome measures were the prevalence of adequate antibody levels against hepatitis B, poliomyelitis and measles.
Results: Only 54% (95% Cl 44–63%) of the children had adequate immunity (10 m iu/mL) to hepatitis B, and one child had been infected despite vaccination. Although all the children (95% Cl 96–100%) had adequate immunity (i.e. neutralizing antibodies at a dilution of 1:8) to poliovirus 2, only 93% (95% Cl 86–96%) and 60% (95% Cl 50–69%) had adequate immunity to polioviruses 1 and 3, respectively. Nearly all (96%; 95% Cl 90–98%) of the children had adequate immunity (i.e. detectable IgG antibody) to measles.
Conclusions: Although a relatively low proportion of the children had adequate antibody levels against hepatitis B the clinical significance of this observation is uncertain. Further studies are needed to determine whether fully vaccinated Torres Strait Island children have been adequately protected and whether they require a booster dose of hepatitis B vaccine. A substantial proportion of fully vaccinated Aboriginal and Torres Strait Island children are inadequately protected against poliomyelitis, and therefore any such child with acute flaccid paralysis should be investigated fully for poliomyelitis. Vaccinated Aboriginal and Torres Strait Island children are well protected against measles, as are other Australian children.  相似文献   
106.
107.
108.
CASE REPORT: We present a case of traumatic displacement of corneal flap in the superior temporal quadrant 13 days after LASIK. The flap was repositioned after gentle irrigation of BSS, cleaned the interface and then drying the flap to verify its stability. In the next day the flap was adhered, clear cornea,smooth and visual acuity without correction was 1.00. DISCUSSION: We should try immediately to reposition the flap after traumatic displacement, as in this case.  相似文献   
109.
110.
PURPOSE/METHODS: We report a 34-year-old woman with sytemic lupus erythematosus (S.L.E.) and antiphospholipidic syndrome which presented severe ischaemic retinopathy and neovascular proliferation. RESULTS/CONCLUSIONS: We achieved no progression of the disease and stabilization of visual acuity with panphotocoagulation. We recommend periodic ophtalmologic exams because of the scarce symptomatology.  相似文献   
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