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   10176篇
  免费   646篇
  国内免费   65篇
耳鼻咽喉   60篇
儿科学   220篇
妇产科学   78篇
基础医学   1286篇
口腔科学   214篇
临床医学   717篇
内科学   2601篇
皮肤病学   134篇
神经病学   585篇
特种医学   386篇
外国民族医学   1篇
外科学   1952篇
综合类   34篇
一般理论   2篇
预防医学   204篇
眼科学   145篇
药学   726篇
中国医学   16篇
肿瘤学   1526篇
  2023年   149篇
  2022年   239篇
  2021年   541篇
  2020年   273篇
  2019年   343篇
  2018年   410篇
  2017年   314篇
  2016年   355篇
  2015年   340篇
  2014年   416篇
  2013年   442篇
  2012年   647篇
  2011年   708篇
  2010年   403篇
  2009年   303篇
  2008年   555篇
  2007年   503篇
  2006年   414篇
  2005年   386篇
  2004年   395篇
  2003年   363篇
  2002年   305篇
  2001年   144篇
  2000年   142篇
  1999年   150篇
  1998年   95篇
  1997年   81篇
  1996年   65篇
  1995年   58篇
  1994年   50篇
  1993年   68篇
  1992年   100篇
  1991年   110篇
  1990年   103篇
  1989年   101篇
  1988年   92篇
  1987年   92篇
  1986年   80篇
  1985年   83篇
  1984年   58篇
  1983年   48篇
  1982年   26篇
  1980年   22篇
  1979年   33篇
  1977年   20篇
  1975年   22篇
  1974年   23篇
  1971年   24篇
  1969年   20篇
  1968年   21篇
排序方式: 共有10000条查询结果,搜索用时 842 毫秒
1.
2.
3.
4.
5.
BackgroundTIAregistry.org is an international cohort of patients with transient ischemic attack (TIA) or minor stroke within 7 days before enrollment in the registry. Main analyses of 1-year follow-up data have been reported.5 We conducted subanalysis on the baseline and 1-year follow-up data of Japanese patients.MethodsThe patients were classified into 2 groups based on Japanese ethnicity, Japanese (345) and non-Japanese (3238), and their baseline data and 1-year event rates were compared. We also determined risk factors and predictors of 1-year stroke.ResultsCurrent smoking, regular alcohol drinking, intracranial arterial stenosis, and small vessel occlusion; and hypertension, dyslipidemia, coronary artery disease, and extracranial arterial stenosis were more and less common among Japanese patients, respectively. Stroke risk was higher and TIA risk was lower at 1-year follow-up among Japanese patients. The baseline risk factors for recurrent stroke were diabetes, alcohol drinking, and large artery atherosclerosis. Independent predictors of 1-year stroke risk were prior congestive heart failure and alcohol consumption.ConclusionsThe two populations of patients featured differences in risk factors, stroke subtypes, and outcome events. Predictors of recurrent stroke among Japanese patients included congestive heart failure and regular alcohol drinking. Strategies to attenuate residual risk of stroke aside from adherence to current guidelines should take our Japanese-patient specific findings into account.  相似文献   
6.
7.
Fibroblastic connective tissue nevus (FCTN) is a benign cutaneous mesenchymal lesion characterized by proliferation of CD34‐positive fibroblastic/myofibroblastic spindle‐shaped cells. We report a case of agminated FCTN on the right lower abdomen of a 1‐year‐old boy.  相似文献   
8.
9.
A nationwide survey of transient hyperammonemia in newborns was carried out in Japan. A total of 18 patients, consisting of 12 male and 6 female infants, were reported from 11 facilities. These neonates exhibited hyperammonemia with plasma ammonia levels in the range from 124 to 6256 micrograms/dl. Four newborn infants of the 18 died in the neonatal period, and an additional one died in the early infancy. Among the 13 infants who were alive at the time of this survey, 6 had neurological sequelae, including mental retardation, spastic quadriplegia and epilepsy. The multivariate analysis revealed that the Apgar score at 1 minute, peak plasma ammonia concentration, birth weight and sex were significant factors affecting the prognosis of life.  相似文献   
10.
Ninety-one patients with operation history for urotheliomas were followed-up by urinary cytology for 17.5 months on the average. Cytologically, fresh urine was examined every month and vesical irrigation fluid every three months. Cystoscopy was also performed every three months, IVP every six months, and biopsy was performed when carcinoma or dysplasia was suspected. As a result, cases were classified into four groups. Group 1: All cytological examination were negative. Group 2: Cytology was positive for two or three months after TUR-Bt during which period vesical instillation therapy of anti-cancer drugs was performed, but was negative after this period. Group 3: Positive and negative cytology were diagnosed irregularly. Group 4: All cytological examinations were positive. The numbers of cases classified into these groups were 27 (29.7%), 7 (7.7%), 43 (47.3%) and 14 (15.4%), respectively. Tumor recurrence was seen in 1/27 (3.7%), 0/7, 12/43 (27.9%) and 4/14 (28.6%) cases, respectively. Metastasis was seen in only five cases of the group 4. Tumor recurrence and positive urinary cytology at the same time were seen in nine cases (20.9%) of group 3, and eight cases (57.1%) of group 4. Thirty four cases (79.1%) with discrepancy of cytological and endoscopic findings in group 3, in which cases 20 cases had only positive irrigation cytology and 11 cases had positive fresh urine and irrigation specimens, were more suspicious of temporary existence of in situ carcinomas or dysplastic urothelium. Of six cases with the discrepancy in group 4, three cases were in situ carcinoma diagnosed by random biopsies, and four cases had positive cytologies after TUR-Bt continuously.(ABSTRACT TRUNCATED AT 250 WORDS)  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