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   314648篇
  免费   62383篇
  国内免费   14366篇
耳鼻咽喉   3600篇
儿科学   7257篇
妇产科学   5679篇
基础医学   43373篇
口腔科学   9124篇
临床医学   42891篇
内科学   62025篇
皮肤病学   9991篇
神经病学   26130篇
特种医学   10688篇
外国民族医学   96篇
外科学   40019篇
综合类   34200篇
现状与发展   49篇
一般理论   67篇
预防医学   19260篇
眼科学   7945篇
药学   29542篇
  164篇
中国医学   11893篇
肿瘤学   27404篇
  2024年   700篇
  2023年   3546篇
  2022年   8806篇
  2021年   12700篇
  2020年   13090篇
  2019年   17659篇
  2018年   17529篇
  2017年   17725篇
  2016年   18104篇
  2015年   21310篇
  2014年   23881篇
  2013年   23574篇
  2012年   21663篇
  2011年   23260篇
  2010年   20203篇
  2009年   14432篇
  2008年   14902篇
  2007年   13846篇
  2006年   13440篇
  2005年   13306篇
  2004年   9458篇
  2003年   8485篇
  2002年   7556篇
  2001年   6875篇
  2000年   6905篇
  1999年   6766篇
  1998年   3710篇
  1997年   3725篇
  1996年   2837篇
  1995年   2622篇
  1994年   2272篇
  1993年   1519篇
  1992年   2380篇
  1991年   2067篇
  1990年   1731篇
  1989年   1510篇
  1988年   1309篇
  1987年   1204篇
  1986年   970篇
  1985年   791篇
  1984年   519篇
  1983年   401篇
  1982年   239篇
  1981年   222篇
  1980年   200篇
  1979年   260篇
  1978年   153篇
  1977年   125篇
  1976年   110篇
  1974年   121篇
排序方式: 共有10000条查询结果,搜索用时 46 毫秒
991.
Objective: To determine the effects of a total laryngectomy on the swallow and subsequent quality of life in head and neck cancer patients. Design: Cross‐sectional single centre cohort study. Setting: Head and Neck Oncology Unit, Tertiary Referral Unit. Patients: Sixty‐two patients who underwent total laryngectomy at our centre participated in the study. Methods: Subjects were stratified by age, sex, tumour stage, other procedures such as myotomy and nerve re‐implantation. Pharyngectomy, glossectomy, flap reconstruction, neck dissection and previous radio‐ and chemotherapy were also assessed to see if they affected swallow and subsequent quality of life. Main outcome was measured using the MD Anderson Dysphagia Inventory questionnaire. Results: Responses were received from 46 males and 16 females (response rate of 80.5%) with a mean age of 64.7 years (SD 9.4). Median follow‐up in patients was 90 months (range 1–276). The mean MD Anderson Dysphagia Inventory total score in our series of patients was 77.7 (SD 16.6). MD Anderson Dysphagia Inventory global score was 79.4 (SD 22.6), Emotional score was 77.7 (SD 17.8), Functional score 81.3 (SD 15.9) and Physical score was 74.1(SD 18). Statistically significant differences were seen between the emotional scores of glossectomised and non‐glossectomised patients (Mann Whitney, P = 0.04). No significant correlation was seen between the subscale scores and the remaining treatment variables such as age, gender, site, tumour stage, myotomy, nerve implantation, radiotherapy, reconstruction and major complications. Conclusion: This questionnaire study is the largest of its type to assess the swallow of patients who have undergone laryngectomy at a single centre. The overall result confirmed that most patients had a subjectively good swallow. Only glossectomy and the method of PE segment closure were shown to significantly affect swallowing outcomes following surgery. We recommend further work especially prospective studies pre and post surgery using this or similarly validated instruments to fully assess swallow in the laryngectomy population.  相似文献   
992.
The hepatitis B immunization programme in Singapore   总被引:2,自引:0,他引:2  
A voluntary immunization programme to prevent perinatal transmission of hepatitis B virus (HBV) infection in Singapore was implemented on 1 October 1985 as an integral component of the national childhood immunization programme. Up to April 1988, a total of 68,845 mothers who attended government maternal and child health clinics were screened for the disease. Of these, 2432 (3.5%) were positive for hepatitis B surface antigen (HBsAg) and 904 (1.3%) for hepatitis B e antigen (HBeAg). Virtually all the babies born to carrier mothers completed the full immunization schedule; and in addition, those of HBeAg-positive mothers were given a dose of hepatitis B immunoglobulin at birth. The hepatitis B immunization programme was extended on 1 September 1987 to cover all newborns. About 90% of the 15,943 babies delivered in government institutions from September 1987 to April 1988 were immunized at birth, with the subsequent doses being administered at maternal and child health clinics at 4-6 weeks and 5 months later. More than 85% of the children given the full course of plasma-derived and yeast-derived hepatitis B vaccine from birth continued to have protective antibody to HBV two years after immunization. The programme is being closely monitored to assess the duration of immunity and the need for booster doses, while seronegative adults are also being encouraged to be vaccinated.  相似文献   
993.
The most outstanding pathological changes of perinatal babies and children, based on the review of the autopsy files in the 1st Affiliated Hospital of West China University of Medical Sciences, are lymphocytic depletion, and reticuloepithelial cell swelling and/or fusiform malformation in the cortex, while in the medulla apoptosis is more prominent. We suppose that these alterations are due to immaturity of cortical thymocytes, and in the diseased condition, they are easily affected by extraordinary factors, especially the influence of corticosterone inducing acute severe necrosis, so the number of lymphocytes are obviously diminished. But, in the medulla, as intact mature lymphocytes exist, physiological phenomenon such as apoptosis is rather prominent in it. While in the medulla, Hassall's corpuscles have various characteristic changes, such as cornification, calcification, fusion, cystic change and disintegration. Besides, we observed a new alteration in the thymus defined as vacuolization. All the above pathological changes reached the peak in the 28- day group; there after, they might become either worse or better according to the condition of the disease and growth of the body. However, these are still problems to be further studied separately.  相似文献   
994.
It is often necessary to perform genioplasty in the same time of the surgical orthodontics. From Feb. 1985 to Feb. 1987, 31 cases of genioplaties were accomplished by using of cortical plate of mental mandibular bone. The ages of patients were ranged from 17-37 years old. The results of operations were satisfied.  相似文献   
995.
胃癌中性糖脂的分离及纯化   总被引:3,自引:0,他引:3  
张积仁  张德胜 《医学争鸣》1989,10(6):370-371
作者应用甲醇氯仿抽提胃癌总脂,经sephadex-A25离子交换层析,florisil层析的方法从28g胃癌组织中分离纯化出中性糖脂(?)1.1mg,经高效薄层色谱分析,与标准品对照证实,条带清楚,纯度可靠。为胃癌中性糖脂抗原的研究打下了基础。  相似文献   
996.
997.
采用放射免疫法测定31例老年心功能不全患者血浆心钠素(ANP)浓度,发现老年心功能不全组ANP明显低于对照组(P<0.01)。血浆ANP含量随心功能不全的严重程度而明显减少(P<0.05)。病程与ANP浓度呈负相关 (r=-0.441,P<0.05)。不同病种、不同受累部位及有或无房颤之间ANP差异无显著性(P<0.05)。  相似文献   
998.
The xanthine oxidase catalysed release of superoxide free radicals (O2-) from endogenous hypoxanthine was determined in homogenates of synovium obtained from three groups of patients, those undergoing primary or revision total hip replacement (THR) for osteoarthritis and those undergoing arthroscopy of the knee for semilunar disc injuries. The concentrations of hypoxanthine in homogenates obtained during THR were found to be significantly higher than those in the group with semilunar disc injuries. The results suggest that there is a greater predisposition to free radical release and tissue damage in osteoarthritis.  相似文献   
999.
讨论了一系列N-酰化壳聚糖膜的抗张强度、透水性、VB_(12)的透过性、透氧性以及血液相容性。N-已酰化壳聚糖膜具有良好的血液相容性。在制膜过程中,加入分子量为1500的聚乙二醇为致孔剂,则可使N-己酰化壳聚糖膜的渗透性有较大提高。同时保持较好的血液相容性和强度。  相似文献   
1000.
We compared the Acrysoft monofocal intraocular lens (IOL) in the mini monovision formula (n = 20) with the Array multifocal intraocular lens (n = 20) for glasses independence after cataract surgery. The Acrysoft monofocal IOL group showed similar and even slightly better results than the Array multifocal IOL group. The monofocal Acrysoft IOL using the mini monovision (blended vision) formula is a good alternative for providing post-cataract surgery glasses independence. Drs. Chen, Clinical Assistant Professor of Ophthalmology and Neal H. Atebara are at University of Hawaii School of Medicine, Honolulu, Hawaii, USA. Dr. Te Tsaw Chen, Past Professor & Director, was at Department of Ophthalmology, Taipei Medical University, Taipei, ROC. The authors have stated that they do not have a significant financial interest or other relationship with any product manufacturer or provider of services discussed in this article. The authors also do not discuss the use of off-label products, which includes unlabeled, unapproved, or investigative products or devices. The authors compared the Acrysoft monofocal intraocular lens in the mini monovision formula to the Array multifocal intraocular lens for glasses independence after cataract surgery.  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