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   29830篇
  免费   1581篇
  国内免费   149篇
耳鼻咽喉   362篇
儿科学   547篇
妇产科学   550篇
基础医学   3869篇
口腔科学   735篇
临床医学   2221篇
内科学   8057篇
皮肤病学   496篇
神经病学   2261篇
特种医学   914篇
外科学   4710篇
综合类   139篇
一般理论   2篇
预防医学   1035篇
眼科学   504篇
药学   2087篇
中国医学   58篇
肿瘤学   3013篇
  2023年   145篇
  2022年   246篇
  2021年   597篇
  2020年   349篇
  2019年   411篇
  2018年   591篇
  2017年   461篇
  2016年   569篇
  2015年   572篇
  2014年   810篇
  2013年   987篇
  2012年   1486篇
  2011年   1611篇
  2010年   879篇
  2009年   787篇
  2008年   1499篇
  2007年   1578篇
  2006年   1398篇
  2005年   1348篇
  2004年   1363篇
  2003年   1299篇
  2002年   1343篇
  2001年   941篇
  2000年   977篇
  1999年   847篇
  1998年   366篇
  1997年   266篇
  1996年   249篇
  1995年   204篇
  1994年   190篇
  1993年   167篇
  1992年   622篇
  1991年   639篇
  1990年   555篇
  1989年   550篇
  1988年   531篇
  1987年   510篇
  1986年   434篇
  1985年   434篇
  1984年   322篇
  1983年   242篇
  1979年   236篇
  1978年   133篇
  1977年   138篇
  1974年   128篇
  1973年   119篇
  1972年   137篇
  1971年   127篇
  1969年   137篇
  1967年   128篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
Finasteride is standard medical treatment for androgenetic alopecia; however, no large studies with 5 years or more of follow up have been performed in Japan. The authors followed Japanese men with androgenetic alopecia treated with finasteride for 5 years to evaluate long‐term treatment efficacy. Of 903 men treated with finasteride (1 mg/day), 801 patients were evaluated over 5 years by modified global photographic assessment. Although the proportion of improvement was high (99.4%), modified global photographic assessment scores after 5 years of treatment were lower in patients with more advanced disease as measured by the modified Norwood–Hamilton scale. After separating patients into “sufficient” and “insufficient” efficacy groups according to the modified global photographic assessment score after 5 years (scores ≥6 and <6, respectively), multivariate analysis showed that independent risk factors of insufficient efficacy were age at start of treatment of 40 years or more (P = 0.021) and classification on the modified Norwood–Hamilton scale (P < 0.001), whereas presence of stress at start of treatment was a negative predictor (P = 0.025). In conclusion, continuous finasteride treatment for 5 years improved androgenetic alopecia with sustained effect among Japanese. Younger age and less advanced disease at start of treatment were the key predictors of higher finasteride efficacy.  相似文献   
2.
3.
4.
Two cultivars of Japanese parsley were harvested in different seasons; their antioxidant capacities were evaluated by oxygen radical absorbance capacity (ORAC) methods, and the contents of hydrophilic and lipophilic antioxidants were compared. Japanese parsley possessed potent antioxidant capacities both in hydrophilic and lipophilic extracts when evaluated by ORAC methods. LC/MS/MS analyses revealed that chlorogenic acid and four kinds of quercetin glycosides were major antioxidants in the hydrophilic extract. Lutein was the main contributor to the antioxidant capacity of the lipophilic extract. Antioxidant capacities of the hydrophilic extracts of both cultivars tended to be higher in winter because of the increase in the contents of chlorogenic acid and quercetin glycosides. An obvious trend in the lipophilic antioxidant capacities or lutein contents was not observed irrespective of the cultivar.  相似文献   
5.
6.
7.
Early onset periodontitis is rarely seen in infants, though often leads to an acute and serious clinical course when encountered in such patients. Autoimmune neutropenia presents systemic and dental symptoms, as depressed resistance to bacterial infection is caused by a disorder that reduces the number of neutrophils. This disease can result in not only gingival inflammation but also destruction of periodontal tissues, such as attachment loss, alveolar bone absorption, and early tooth loss in primary as well as mixed dentition. Here, we report treatment of a child with marginal periodontitis from the age of 3 years–7 years 9 months. No systemic manifestations were noted until 3 years of age, thus the patient had never received a detailed examination or medication related to the disease. Following examinations at our department, we referred the patient to a pediatrician at our university hospital for possible systemic disease, who made a diagnosis of autoimmune neutropenia. Although administration of antibiotics and professional dental care were continued, neutrophil count was not increased and progressive periodontal destruction was observed. Extraction of teeth with poor prognosis was performed and a prosthetic strategy for the missing teeth developed. It is important to recognize that periodontitis along with autoimmune neutropenia can appear in infants, even though the incidence is quite low. Early detection and early treatment of this disease is necessary for delaying progression of periodontitis and optimal occlusal induction of permanent teeth.  相似文献   
8.
9.
10.
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