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   957篇
  免费   123篇
  国内免费   12篇
耳鼻咽喉   60篇
儿科学   55篇
妇产科学   17篇
基础医学   105篇
口腔科学   33篇
临床医学   105篇
内科学   214篇
皮肤病学   15篇
神经病学   36篇
特种医学   42篇
外科学   220篇
综合类   17篇
一般理论   6篇
预防医学   48篇
眼科学   10篇
药学   35篇
肿瘤学   74篇
  2023年   8篇
  2022年   18篇
  2021年   36篇
  2020年   21篇
  2019年   31篇
  2018年   38篇
  2017年   35篇
  2016年   24篇
  2015年   27篇
  2014年   30篇
  2013年   31篇
  2012年   40篇
  2011年   48篇
  2010年   38篇
  2009年   34篇
  2008年   49篇
  2007年   47篇
  2006年   39篇
  2005年   21篇
  2004年   31篇
  2003年   18篇
  2002年   15篇
  2001年   14篇
  2000年   14篇
  1999年   16篇
  1998年   18篇
  1997年   14篇
  1996年   19篇
  1994年   14篇
  1993年   11篇
  1992年   15篇
  1991年   16篇
  1990年   9篇
  1989年   18篇
  1988年   7篇
  1987年   12篇
  1986年   15篇
  1985年   17篇
  1984年   16篇
  1983年   14篇
  1982年   10篇
  1980年   12篇
  1979年   12篇
  1978年   13篇
  1977年   9篇
  1976年   6篇
  1973年   12篇
  1972年   18篇
  1971年   8篇
  1970年   7篇
排序方式: 共有1092条查询结果,搜索用时 15 毫秒
61.
The extant nosological formulations of the American Psychiatric Association denotes that Posttraumatic Stress Disorder (PTSD) maybe predicated upon some life threatening experience. Historically, combat, robbery, rape, and serious accidents have been included as traumatogenetic stressors. Only recently has life-threatening illness been considered as a traumatogenetic stressor. This paper reviews the relativity between cancer and posttraumatic stress.  相似文献   
62.
We discuss an infant with MI secondary to cystic fibrosis, who was managed surgically by a double barrel ileostomy for mid – small bowel atresia and developed severe faecal impaction in the post – operative period. The faecal impaction was treated successfully with oral NAC and 0.2% NAC contrast enemas. The patient's liver function tests revealed a dramatic increase in transaminases and bilirubin contemporaneous with the administration of the enemas. The levels showed a spontaneous improvement after discontinuation. This is only the second reported case of hepatotoxicity secondary to NAC enemas in the literature. While our experience offers modest support for the use of NAC, its efficacy is not yet proven and paediatric surgeons using NAC in the enema form need to closely monitor liver function contemporaneous with this agent's administration and adjust their treatment accordingly.  相似文献   
63.
The authors reviewed their experience in reconstructing the nasofrontal duct with thin silicone rubber sheeting in patients who had chronic inflammatory frontal sinus disease. The 164 patients were divided into four groups. The patients in group 1 had the traditional modified Lynch procedure, while those in group 2 had certain technical variations of the modified Lynch operation. The patients in the other two groups had major technical variations: those in group 3 had a primary osteoplastic flap approach and those in group 4 had revisions of failed osteoplastic flap with fat obliteration operations. Surgical indications included mucopyocele (87 patients), chronic frontal sinusitis (71 patients), osteomyelitis (2 patients), acute sinusitis (2 patients), and subacute sinusitis (2 patients). Follow-up averaged 47 months. At their last clinic visit, 157 patients (96%) were asymptomatic. Forty-six revision procedures were performed in 30 patients (18% of initial cases). There were no major complications. Nasofrontal duct reconstruction using thin silicone rubber sheeting is technically straightforward, safe, and effective. Laryngoscope, 106:809-815, 1996  相似文献   
64.
Slightly elevated urinary albumin excretion rate (microalbuminuria) is a marker of early diabetic nephropathy, but it is unclear if the established definition of microalbuminuria (20–200 μg/min) is correct for children and adolescents. We investigated the albumin excretion rate, albumin/creatinine ratio and urinary albumin concentration in 150 healthy schoolchildren and adolescents to (a) obtain a reference value for albumin excretion rate, (b) relate albumin excretion to pubertal stages and (c) evaluate albumin/creatinine ratio and morning albumin concentration as screening methods for elevatcd albumin excretion rate. Albumin concentration was measured by immunoturbidimetry in timed overnight urine samples. The albumin excretion showed a skewed distribution (geometric mean 3.2 μg/min, 95 percentile 15.1 μg/min). In girls, a peak in the albumin excretion rate was found at the pubertal stage 4 (Tanner) and in boys at stage 5. Albumin/creatinine ratio of 2.5 mg/mmol as a scrccning level for elevatcd albumin cxcrction (15 μg/min) showed a high positivc (0.88) and negative (0.99) predictive value.  相似文献   
65.
66.
67.
A series of 62 plasma samples have been examined for genetic variation by the technique of two-dimensional polyacrylamide gel electrophoresis followed by silver-staining of the gels. Twenty polypeptides chosen without respect to variability were considered suitable for scoring. Of the total of 1,240 polypeptides, 29 could not be scored unambiguously. Seventy-five of the remaining 1,211 exhibited the combination of a normal and a variant polypeptide. All variants were present in either the father or the mother of the subject. This index of heterozygosity (6.2 +/- 0.7%) is substantially higher than those reported by others in similar studies of human fibroblasts, lymphocytes, kidney, or brain cells.  相似文献   
68.
The detection of environmental mutagens   总被引:2,自引:0,他引:2  
  相似文献   
69.
70.
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