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   61383篇
  免费   3967篇
  国内免费   119篇
耳鼻咽喉   558篇
儿科学   2576篇
妇产科学   1681篇
基础医学   7705篇
口腔科学   658篇
临床医学   8949篇
内科学   10705篇
皮肤病学   904篇
神经病学   6331篇
特种医学   1289篇
外国民族医学   2篇
外科学   5092篇
综合类   727篇
一般理论   109篇
预防医学   8433篇
眼科学   806篇
药学   3945篇
中国医学   61篇
肿瘤学   4938篇
  2023年   326篇
  2022年   452篇
  2021年   1082篇
  2020年   752篇
  2019年   1119篇
  2018年   1282篇
  2017年   1037篇
  2016年   1126篇
  2015年   1327篇
  2014年   1817篇
  2013年   2890篇
  2012年   4212篇
  2011年   4496篇
  2010年   2509篇
  2009年   2246篇
  2008年   4082篇
  2007年   4350篇
  2006年   4163篇
  2005年   4299篇
  2004年   4100篇
  2003年   3857篇
  2002年   3558篇
  2001年   648篇
  2000年   507篇
  1999年   617篇
  1998年   747篇
  1997年   659篇
  1996年   524篇
  1995年   530篇
  1994年   458篇
  1993年   394篇
  1992年   403篇
  1991年   346篇
  1990年   317篇
  1989年   340篇
  1988年   330篇
  1987年   299篇
  1986年   277篇
  1985年   272篇
  1984年   289篇
  1983年   249篇
  1982年   269篇
  1981年   258篇
  1980年   204篇
  1979年   182篇
  1978年   156篇
  1977年   120篇
  1976年   100篇
  1974年   132篇
  1973年   106篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
101.
Germline mutations in the neurofibromatosis type 2 tumour suppressor gene   总被引:13,自引:2,他引:11  
The recent identification of the NF2 tumour suppressor genehas enabled large scale screening for pathological mutationsin the gene. We have sought germline mutations In the NF2 geneby SSCP and heteroduplex analysis of cDNA and genomic DNA samplesfollowed by cloning and sequencing of mutant alleles. In thepresent report we describe 11 putative pathological mutations,including five nonsense mutations, three short insertions ordeletions cauing frameshifts and three missense mutations. Moststop mutations and frameshift mutations were found In Individualsexpressing a severe phenotype while one of the three missensemutations was associated with a mild phenotype. Four unrelatedNF2 patients of the 93 tested were found to have identical nonsensemutations caused by a C to T transition (C169) in a CpG dinucleotide,which is a potential mutational hotspot in the NF2 tumour suppressorgene.  相似文献   
102.
103.
104.
A review of the history of fetal heart rate monitoring is followed by detailed analysis of eight randomized, controlled trials and of a recent prospective study of electronic fetal monitoring compared with intermittent auscultation. No significant differences between the methods were reported in perinatal mortality rates, neonatal infection rates, and Apgar scores. Mixed results were reported for length of labor, maternal analgesic use during labor, maternal genital tract infection rates, umbilical cord pH values, and admissions to neonatal intensive care units. Auscultation was associated in two trials with a significantly increased rate of neonatal seizures. Electronic fetal monitoring was correlated with a significantly increased cesarean delivery rate in the first four trials, and with a significantly increased rate of operative delivery (forceps plus cesarean delivery) in three later trials. A decision tree is presented to assist the clinician in selecting the appropriate fetal monitoring method for a given client.  相似文献   
105.
Dreams during pregnancy were collected from post-partum women on the maternity ward of an Israeli hospital. Our data indicate that primipara women and women with complicated obstetrical histories were more likely to report increased dreaming during pregnancy. The collected dream corpus suggests that dreams during pregnancy can be viewed as a distinct dream genre. This paper develops a tentative typology of that genre. In addition, the authors argue that the context of disclosure was highly relevant to the sorts of manifest contents that were reported.  相似文献   
106.
107.
One of the most exciting developments in pediatric dermatology has been the use of the flashlamp-pumped, 585-nm, pulsed dye laser for treatment of vascular birthmarks. In many cases the results are miraculous. The increase in self-esteem and happiness of many children and adolescents has been overwhelming; for some, depression has been lifted, stuttering has ceased, social involvement has increased, and antidepressants have been discontinued. There are many success stories to tell.
Despite the remarkable effects of the pulsed dye laser and the medical and psychosocial indications for its use, the issue of pain control remains significant. We have no perfect outpatient pediatric anesthetic. Most methods carry either some risk or, if not hazardous, often are not very effective for controlling pain. Needless to say, a diversity of opinions exist on how to manage discomfort from this treatment modality. Therefore, we thought it would be useful to share the experiences and opinions of several dermatologists who have extensive experience with the pulsed dye laser.  相似文献   
108.
To enhance individual and family health during recovery from heart surgery, this study employed nursing interventions based on self-efficacy and family stress theory during the hospitalization period and for 3 months thereafter. The effectiveness of the interventions were assessed through a randomized trial in which 67 prospective bypass and valve surgery patients, aged 30-77 years, and their spouses, were allocated either the experimental interventions or usual care and followed for 6 months. At 3 months post-surgery, the only statistically significant differences between the experimentals and controls were on perceived self-efficacy for lifting and tolerating emotional distress. At 6 months no significant differences were found on individual or family measures. Analyses revealed that age, gender and preoperative cardiac status significantly affected individual recovery. The study is continuing with a larger sample in order to explicate the recovery process and to better determine whether a low intensity nursing intervention can effect changes in individual and family recovery.  相似文献   
109.
110.
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