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   1879篇
  免费   110篇
  国内免费   8篇
耳鼻咽喉   5篇
儿科学   62篇
妇产科学   84篇
基础医学   190篇
口腔科学   66篇
临床医学   138篇
内科学   457篇
皮肤病学   29篇
神经病学   60篇
特种医学   52篇
外科学   364篇
综合类   49篇
一般理论   1篇
预防医学   115篇
眼科学   23篇
药学   180篇
中国医学   8篇
肿瘤学   114篇
  2023年   22篇
  2022年   49篇
  2021年   64篇
  2020年   39篇
  2019年   71篇
  2018年   73篇
  2017年   47篇
  2016年   37篇
  2015年   52篇
  2014年   65篇
  2013年   86篇
  2012年   113篇
  2011年   119篇
  2010年   94篇
  2009年   58篇
  2008年   96篇
  2007年   110篇
  2006年   112篇
  2005年   72篇
  2004年   71篇
  2003年   62篇
  2002年   72篇
  2001年   35篇
  2000年   32篇
  1999年   32篇
  1998年   21篇
  1997年   9篇
  1996年   7篇
  1995年   15篇
  1994年   15篇
  1993年   9篇
  1992年   22篇
  1991年   16篇
  1990年   26篇
  1989年   20篇
  1988年   24篇
  1987年   8篇
  1986年   9篇
  1985年   12篇
  1983年   8篇
  1982年   8篇
  1981年   5篇
  1980年   5篇
  1979年   5篇
  1974年   6篇
  1973年   5篇
  1972年   7篇
  1969年   8篇
  1967年   6篇
  1966年   5篇
排序方式: 共有1997条查询结果,搜索用时 10 毫秒
1.
Lasers in Medical Science - Melasma is a chronic, dark brown–pigmented patches and macules commonly on the face. Many treatment modalities for melasma have been used as hydroquinone, laser...  相似文献   
2.
3.
We report the case of a 38-year-old woman who presented with chronic lower abdominal pain. Her past medical history included a splenectomy due to abdominal trauma. Ultrasound examination revealed four pelvic tumors which, upon laparotomy, were found to be the result of splenosis. Approximately 100 cases of splenosis have been reported but only a minority of them have been published in the gynecological literature. Our case indicates that those involved in pelvic scanning (even of asymptomatic women) and/or treating those complaining of lower abdominal pain or presenting with pelvic tumors should be aware of splenosis as a possible diagnosis.  相似文献   
4.
Management of infertility is slow, time consuming and, paradoxically, costly. It needs to be streamlined so that diagnosis and management go hand in hand with proper division between primary physicians at district level and highly trained specialists at regional level. Incorporation of assisted conception techniques is the key to the success of such an approach.  相似文献   
5.
OBJECTIVE--To assess the responsiveness of the SF 36 health survey questionnaire to changes in health status over time for four common clinical conditions. DESIGN--Postal questionnaires at baseline and after one year's follow up, with two reminders at two week intervals if necessary. SETTING--Clinics and four training general practices in Grampian region in the north east of Scotland. PATIENTS--More than 1,700 patients aged 16 to 86 years with one of four conditions: low back pain, menorrhagia, suspected peptic ulcer, and varicose veins; and a random sample of 900 members of the local general population for comparison. MAIN MEASURES--A transition question measuring change in health and the eight scales of the SF 36 health survey questionnaire; standardised response means (mean change in score for a scale divided by the standard deviation of the change in scores) used to quantify the instrument's responsiveness to changes in perceived health status, and comparison of patient scores at baseline and follow up with those of the general population. RESULTS--The response rate exceeded 75% in a patient population. Changes across the SF 36 questionnaire were associated with self reported changes in health, as measured by the transition question. The questionnaire showed significant improvements in health status for all four clinical conditions, whether in referred or non-referred patients. For patients with suspected peptic ulcer and varicose veins the SF 36 profiles at one year approximate to the general population. CONCLUSIONS--These results provide the first evidence of the responsiveness of the SF 36 questionnaire to changes in perceived health status in a patient population in the United Kingdom.  相似文献   
6.
OBJECTIVE: The aim of this study was to investigate and analyze the angulation of and the various indications for removal of mandibular third molars in Jordanians as a representative Arab sample. METHOD AND MATERIALS: The data included in this retrospective study were obtained from the clinical and radiographic records of 1,282 patients undergoing mandibular third molar surgery during a 5-year period from 1994 to 1999. The indications for removal of the mandibular third molars were classified in accordance with age and gender. The angular position of mandibular third molars was registered. RESULTS: A total of 2,252 mandibular third molars were removed from 740 male patients (57.7%) and 542 female patients (42.3%) aged 14 to 67 years. Pericoronitis was the most common indication for surgery, affecting 1,055 teeth (46.8%). Caries was observed in 519 third molars (23.0%). The vertical angular position was most commonly found (1,383 teeth; 61.4%) followed by the mesioangular position (407 teeth; 18.1%). CONCLUSION: The results obtained in this study are similar to those reported in earlier studies carried out elsewhere, although the incidence of periodontitis among Jordanians was significantly higher and occurred in older patients, and prophylactic removal was performed less frequently than has been reported in other countries.  相似文献   
7.
Exposure of male albino rats to DDVP insecticide at sublethal dose of 30 mg/kg/day through dermal painting for a period of 90 days didn't show any intoxication symptoms or mortality. However, cytopathological changes in testicular and liver tissues were evident. There was a positive correlation between the degree of cellular damage and the period of insecticide administration. In general, damages were prominent in rats treated for 30 days or more. Histological examination of testes showed degenerative seminiferous tubules and fewer leydig cells. Hepatic cells were congested, atrophied and showed different stages of necrobiotic changes. This suggests a great care and caution for workers during different phases of DDVP insecticide handling.  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