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   2095篇
  免费   105篇
  国内免费   57篇
耳鼻咽喉   4篇
儿科学   110篇
妇产科学   28篇
基础医学   306篇
口腔科学   39篇
临床医学   249篇
内科学   483篇
皮肤病学   62篇
神经病学   105篇
特种医学   327篇
外科学   123篇
综合类   28篇
预防医学   148篇
眼科学   5篇
药学   111篇
中国医学   3篇
肿瘤学   126篇
  2023年   7篇
  2022年   9篇
  2021年   36篇
  2020年   23篇
  2019年   22篇
  2018年   36篇
  2017年   22篇
  2016年   23篇
  2015年   45篇
  2014年   46篇
  2013年   85篇
  2012年   80篇
  2011年   67篇
  2010年   77篇
  2009年   86篇
  2008年   64篇
  2007年   94篇
  2006年   59篇
  2005年   54篇
  2004年   40篇
  2003年   34篇
  2002年   37篇
  2001年   46篇
  2000年   46篇
  1999年   47篇
  1998年   81篇
  1997年   92篇
  1996年   118篇
  1995年   65篇
  1994年   62篇
  1993年   58篇
  1992年   38篇
  1991年   30篇
  1990年   44篇
  1989年   54篇
  1988年   52篇
  1987年   51篇
  1986年   54篇
  1985年   48篇
  1984年   16篇
  1983年   23篇
  1982年   18篇
  1981年   15篇
  1980年   15篇
  1979年   11篇
  1978年   17篇
  1977年   11篇
  1976年   15篇
  1975年   15篇
  1925年   6篇
排序方式: 共有2257条查询结果,搜索用时 15 毫秒
1.
2.
3.
4.
5.
6.
BACKGROUND: Since 1997, a number of trials have shown promising results in treating generalized vitiligo with narrowband ultraviolet B (UVB) both in adults and children. However, there is little knowledge concerning the duration and permanency of the treatment-induced repigmentation. OBJECTIVE: Our main objective was to perform a follow-up trial of successfully treated patients receiving narrowband UVB for generalized vitiligo. METHODS: We have investigated to what degree the treatment-induced repigmentation remains stable for up to 2 years post-treatment. We performed an initial open trial including 31 patients with generalized vitiligo. They received narrowband UVB thrice weekly for up to 12 months. Patients experiencing > 75% repigmentation were defined responders and were included in the follow-up trial. Responders were followed every 6 months for up to 2 years after cessation of treatment. We observed the pigmentation status and registered any changes indicating loss of pigmentation and relapse. RESULTS: Eleven of the 31 treated patients were included in the follow-up trial. Six patients had relapse and five patients had stable response 24 months after cessation of treatment. Four out of six relapses were within 6 months post-treatment. CONCLUSION: In our study population of 31 patients with generalized vitiligo, five patients (16%) experienced > 75% stable repigmentation 2 years after cessation of a treatment programme of up to 1 years narrowband UVB therapy.  相似文献   
7.
We report two clinical pregnancies occurring after intracytoplasmic sperm injection (ICSI) using cryopreserved spermatozoa obtained from testicular biopsy, made in two different infertility situations in our clinic. The first patient showed a secretory azoospermia associated with elevated serum follicular stimulating hormone (FSH) level and spermiogenesis maturation arrest. The second patient was affected by azoospermia resulting from bilateral epididymal obstruction. Spermatozoa present in the wet preparation of testicular biopsy made on the day of scrotal exploration were cryopreserved within the testicular tissue for both men. Intracytoplasmic injections were performed at a later date, using spermatozoa prepared from frozen-thawed tissues. In each case, three embryos were obtained and transferred in utero. The transfers resulted in a twin pregnancy for the first case, and in a singleton pregnancy for the second. Living foetuses were seen in the ultrasound scan at the 7th week and both pregnancies are proceeding to date beyond 30 weeks without complications.   相似文献   
8.
9.
10.
BACKGROUND. Schwartz-Jampel syndrome is a rare disorder inherited as an autosomal recessive trait and characterized by growth retardation, multiple skeletal abnormalities, myotonia-like muscle disorders and unusual facies. CASE REPORTS. Case n. 1: A boy, aged 3 years 4 months, was admitted for acute respiratory disease. His main abnormalities included rigid facial expression, blepharophimosis, puckered lips, short neck, pectus carinatum, acetabular dysplasia with coxa vara, platyspondyly and marked growth retardation. There was a continuous muscle fiber activity at rest, with abnormal discharges originating in the muscle component of the neuromuscular junction. Blood investigations revealed low values of IgA. The child died at 4 years. Case n. 2: The sister of case n. 1 was examined at 14 months of age. She presented milder facies abnormalities, difficulties of gait because of stiff hips, muscular hypertrophy, coxa vara and growth retardation. X-rays showed skeletal abnormalities and the electromyogram was similar to those of her brother. She had dislocation of her optic lens. CONCLUSION. These 2 sibs have the characteristic manifestations of Schwartz-Jampel syndrome. Parental consanguinity was also present. The IgA deficiency observed in case n. 1 and the lens dislocation in case n. 2 have both been occasionally reported in this syndrome.  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