全文获取类型
收费全文 | 512篇 |
免费 | 26篇 |
国内免费 | 19篇 |
专业分类
耳鼻咽喉 | 3篇 |
儿科学 | 25篇 |
妇产科学 | 10篇 |
基础医学 | 48篇 |
口腔科学 | 11篇 |
临床医学 | 72篇 |
内科学 | 159篇 |
皮肤病学 | 11篇 |
神经病学 | 26篇 |
特种医学 | 44篇 |
外科学 | 54篇 |
综合类 | 22篇 |
预防医学 | 25篇 |
眼科学 | 4篇 |
药学 | 32篇 |
肿瘤学 | 11篇 |
出版年
2018年 | 4篇 |
2016年 | 5篇 |
2015年 | 14篇 |
2014年 | 15篇 |
2013年 | 13篇 |
2012年 | 9篇 |
2011年 | 6篇 |
2010年 | 29篇 |
2009年 | 20篇 |
2008年 | 7篇 |
2007年 | 18篇 |
2006年 | 5篇 |
2005年 | 8篇 |
2003年 | 4篇 |
2002年 | 5篇 |
2001年 | 5篇 |
2000年 | 7篇 |
1999年 | 8篇 |
1998年 | 29篇 |
1997年 | 19篇 |
1996年 | 25篇 |
1995年 | 12篇 |
1994年 | 12篇 |
1993年 | 16篇 |
1992年 | 7篇 |
1991年 | 12篇 |
1990年 | 6篇 |
1989年 | 15篇 |
1988年 | 14篇 |
1987年 | 8篇 |
1986年 | 6篇 |
1985年 | 7篇 |
1983年 | 4篇 |
1982年 | 7篇 |
1981年 | 3篇 |
1980年 | 6篇 |
1979年 | 4篇 |
1976年 | 3篇 |
1975年 | 3篇 |
1972年 | 3篇 |
1962年 | 3篇 |
1959年 | 16篇 |
1958年 | 16篇 |
1957年 | 18篇 |
1956年 | 11篇 |
1955年 | 19篇 |
1954年 | 23篇 |
1952年 | 5篇 |
1949年 | 4篇 |
1948年 | 5篇 |
排序方式: 共有557条查询结果,搜索用时 125 毫秒
101.
102.
103.
本文对模式产地的山药Piper haneei Maxim, var, hancei Maxim,和腺鳞蒟P. kancei Maxim var. squamiglanduferum Fan var. nov.进行了原植物形态特征和花序轴、花序梗、茎、叶的显微特征以及化学成分的TLC及UV比较。挥发油的GC—MS研究共鉴定出38个成分,其中28个是胡椒属植物中首次报道的成分。结果证明了在福建长期以来被认为是山药的腺鳞蒟与模式产地的山药有较大差别,尤其是腺鳞蒟叶上表面有腺鳞,是迄今为止第1个发现具有腺鳞的胡椒属植物。据此把腺鳞蒟作为新变种从山药中分出。腺鳞药是福建南部海风藤主要来源之一。 相似文献
104.
105.
The serotonin (5HT3) antagonist ondansetron was compared in a randomised study with metoclopramide and dexamethasone for the prevention of chemotherapy induced emesis. Thirty children aged 1-15 years with acute lymphoblastic leukaemia received 'intensification modules' according to the MRC United Kingdom acute lymphoblastic leukaemia regimen UKALL XI. This contains the moderately emetogenic drugs daunorubicin, etoposide, and cytarabine. Fifteen children received an intravenous loading dose of ondansetron followed by intravenous or oral doses 12 hourly for five days. Fifteen children received intravenous metoclopramide every six hours for three days with a loading dose of dexamethasone, repeated every eight hours for three days intravenously or orally. Efficacy was assessed by a diary card documenting the incidence of nausea, retching, or vomiting. In the 24 hour period after starting chemotherapy, ondansetron was more effective, with a complete or major response rate of 93%, compared with 33% using metoclopramide/dexamethasone. 相似文献
106.
The effect of anaesthesia and surgery on microsomal enzyme activity was studied in 19 children aged 4-9 years, scheduled for tonsillectomy. The children were randomly allocated to either halothane or ketamine anaesthesia. Antipyrine clearance was measured before and 4 days after surgery by a salivary one-sample technique. Statistically significant (p less than 0.001) increases in antipyrine clearance was found in children who received halothane anaesthesia. The antipyrine clearance was increased by a mean of 26% 4 days after surgery, compared with a pre-operative control measurement. No significant change in antipyrine clearance was observed in children who received ketamine anaesthesia. There was also a significant difference in antipyrine clearance changes after surgery between the two groups (p less than 0.05). Halothane has enzyme-inducing properties after a single exposure in children, while a single dose of ketamine does not. 相似文献
107.
The use of echocardiography in the diagnosis of vegetative endocarditis has been a keystone in the diagnosis and treatment of this important clinical syndrome. In addition, with the use of transesophageal echo this modality has now made important advances in not only diagnosis but in evaluation of global cardiac function. A considerable amount of information has been gathered on the vegetation and these data will be discussed. 相似文献
108.
In this prospective study of 239 patients, 88 (37%) suffered from post-lumbar puncture headache (PPH). The pain was located within the region innervated by the trigeminal nerve in 49% of the drawings, within the occipital and/or suboccipital region in 11%, and within the combined trigeminal/occipital region in 39%. The headache was unilateral at least once in 34% of the patients. Changes in pain location from one region to the other and/or between bilateral and unilateral headache were observed in 54% of the patients throughout the PPH period. Associated symptoms were experienced by 85%, nausea (73%) and dizziness (60%) being the most frequently reported. In the upright position, nausea, dizziness, and tinnitus tended to be present during a fairly large part of the PPH period (57–63% of the days), vomiting occurring only occasionally (28%). The intensity of associated symptoms was positively correlated to PPH severity. Pain in the combined trigeminal/occipital region was most severe and related to more associated symptoms than pain in other regions, and unilateral pain was milder than bilateral pain. Pain in the occipital and/or suboccipital region was mildest. The severity of nausea decreased significantly on the last 2 days of the PPH period, and the intensity of dizziness decreased when PPH was about to subside. Tinnitus is probably due to a cochlear dysfunction, and presents special characteristics. Its incidence was not clearly related to PPH severity and it increased with increasing duration of PPH; its intensity did not decline when PPM was about to wane. 相似文献
109.
医院间接成本分配方法之模拟比较 总被引:2,自引:0,他引:2
介绍了医院间接成本的四种分配方法,即:1直接分配法;2.顺序分配法或阶梯分配法;3.双重分配法;4.联立方程法,并进行了模拟比较,认为双重分配法和联立方程法将成为最主要的间接成本分配方法。 相似文献
110.
TH. Colombo R. Zigeuner ST. Altziebler K. Pummer H. Stettner G. Hubmer 《The Journal of urology》1996,156(5):1682-1684