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   2575975篇
  免费   189200篇
  国内免费   7535篇
耳鼻咽喉   34257篇
儿科学   85139篇
妇产科学   71559篇
基础医学   362943篇
口腔科学   69591篇
临床医学   233543篇
内科学   512857篇
皮肤病学   62422篇
神经病学   213135篇
特种医学   99813篇
外国民族医学   736篇
外科学   385827篇
综合类   50309篇
现状与发展   5篇
一般理论   974篇
预防医学   195111篇
眼科学   56524篇
药学   187784篇
  8篇
中国医学   5330篇
肿瘤学   144843篇
  2021年   19908篇
  2019年   20616篇
  2018年   29273篇
  2017年   22589篇
  2016年   26219篇
  2015年   29503篇
  2014年   40439篇
  2013年   60422篇
  2012年   80226篇
  2011年   84492篇
  2010年   51001篇
  2009年   49146篇
  2008年   79037篇
  2007年   83841篇
  2006年   85565篇
  2005年   81726篇
  2004年   78729篇
  2003年   76046篇
  2002年   73335篇
  2001年   128416篇
  2000年   131337篇
  1999年   110507篇
  1998年   31256篇
  1997年   27922篇
  1996年   28218篇
  1995年   27386篇
  1994年   25067篇
  1993年   23292篇
  1992年   85063篇
  1991年   81540篇
  1990年   78739篇
  1989年   76007篇
  1988年   69405篇
  1987年   67956篇
  1986年   63500篇
  1985年   60467篇
  1984年   44884篇
  1983年   37848篇
  1982年   22370篇
  1981年   19905篇
  1979年   38890篇
  1978年   27372篇
  1977年   23165篇
  1976年   21419篇
  1975年   22761篇
  1974年   26741篇
  1973年   25332篇
  1972年   23730篇
  1971年   21933篇
  1970年   20155篇
排序方式: 共有10000条查询结果,搜索用时 140 毫秒
81.
82.
83.
Acne vulgaris (acne) is a chronic inflammatory disease of the sebaceous gland, characterized by follicular hyperkeratinization, excessive colonization by Propionibacterium acnes (Pacnes) as well as immune reactions and inflammation. Despite an armamentarium of topical treatments available including benzoyl peroxide, retinoids and azelaic acid, topical antibiotics in monotherapies, especially erythromycin and clindamycin, are still used in Europe to treat acne. This intensive use led to antimicrobial‐resistant P. acnes and staphylococci strains becoming one of the main health issues worldwide. This is an update on the current topical acne treatments available in Europe, their mechanism of action, their potential to induce antimicrobial resistance and their clinical efficacy and safety.  相似文献   
84.
We report on a child with several café au lait spots in association with a lumbar lipomeningomyelocele as an apparently new association. Cutaneous markers, the identification of which plays a crucial role in the early diagnosis and management of spinal malformations, can accompany occult spinal dysraphism. Herein we report a case of lumbar lipomeningomyelocele associated with an overlying café au lait spot that served as a marker of occult spinal dysraphism. The patient also had segmental café au lait spots on the face, making the association unique.  相似文献   
85.
86.
87.
88.
Pediatric trachyonychia is an acquired nail disease that can cause distress to families. It is a poorly understood disease, and long‐term follow‐up data are lacking. We present an institutional review of 11 children with isolated pediatric trachyonychia followed over time. Children with the diagnosis of pediatric trachyonychia were identified and invited to participate. Pictures were taken on follow‐up and a questionnaire was answered. Exclusion criteria include having another diagnosis at the initial visit that causes nail dystrophy. Eleven patients with the diagnosis of pediatric trachyonychia were available for follow‐up. The mean age of appearance was 2.7 years (range 2–7 yrs) and the average follow‐up was 66 months (range 10–126 mos). Nine patients were treated with potent topical corticosteroids, one used only petrolatum, and one took vitamin supplements. One patient was found to have an additional skin and hair diagnosis of alopecia areata on follow‐up. On follow‐up, 82% noted improvement of the nails, whereas 18% noted no change. A majority of cases of pediatric trachyonychia are isolated and improve with time, regardless of treatment.  相似文献   
89.
The Combined Aerobic and Resistance Exercise (CARE) Trial compared different types and doses of exercise performed during breast cancer chemotherapy. Here, we report the longer-term follow-up of patient-reported outcomes, health-related fitness and exercise behavior at 6, 12 and 24 months postintervention. A multicenter trial in Canada randomized 301 breast cancer patients initiating chemotherapy to thrice weekly, supervised exercise consisting of a standard dose of 25–30 min of aerobic exercise (STAN; n = 96), a higher dose of 50–60 min of aerobic exercise (HIGH; n = 101) or a combined dose of 50–60 min of aerobic and resistance exercise (COMB; n = 104) performed for the duration of chemotherapy (median of 17 weeks). Primary outcomes were patient-reported outcomes including quality of life, cancer-related symptoms and psychosocial outcomes. Secondary outcomes were objective health-related fitness (assessed at 12 months only) and self-reported exercise behavior. A total of 269 (89.4%) participants completed patient-reported outcomes at all three follow-up time points and 263 (87.4%) completed the health-related fitness assessment at 12-month follow-up. COMB was significantly superior to (i) STAN for sleep quality at 6-month follow-up (p = 0.027); (ii) HIGH for upper body muscular endurance at 12-month follow-up (p = 0.020); and (iii) HIGH for meeting the resistance exercise guideline at 6-month follow-up (p = 0.006). Moreover, self-reported meeting of the combined exercise guideline during follow-up was significantly associated with better patient-reported outcomes and health-related fitness. Performing combined exercise during and after breast cancer chemotherapy may result in better longer-term patient-reported outcomes and health-related fitness compared to performing aerobic exercise alone.  相似文献   
90.
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