全文获取类型
收费全文 | 1157篇 |
免费 | 186篇 |
国内免费 | 7篇 |
专业分类
耳鼻咽喉 | 6篇 |
儿科学 | 60篇 |
妇产科学 | 16篇 |
基础医学 | 94篇 |
口腔科学 | 32篇 |
临床医学 | 106篇 |
内科学 | 216篇 |
皮肤病学 | 16篇 |
神经病学 | 27篇 |
特种医学 | 151篇 |
外科学 | 90篇 |
综合类 | 93篇 |
预防医学 | 259篇 |
眼科学 | 5篇 |
药学 | 78篇 |
肿瘤学 | 101篇 |
出版年
2018年 | 13篇 |
2017年 | 12篇 |
2016年 | 10篇 |
2015年 | 18篇 |
2014年 | 22篇 |
2013年 | 34篇 |
2012年 | 26篇 |
2011年 | 28篇 |
2010年 | 29篇 |
2009年 | 25篇 |
2008年 | 38篇 |
2007年 | 33篇 |
2006年 | 39篇 |
2005年 | 39篇 |
2004年 | 30篇 |
2003年 | 30篇 |
2002年 | 43篇 |
2001年 | 37篇 |
2000年 | 24篇 |
1999年 | 46篇 |
1998年 | 42篇 |
1997年 | 40篇 |
1996年 | 45篇 |
1995年 | 37篇 |
1994年 | 38篇 |
1993年 | 24篇 |
1992年 | 22篇 |
1991年 | 29篇 |
1990年 | 19篇 |
1989年 | 22篇 |
1988年 | 32篇 |
1987年 | 35篇 |
1986年 | 39篇 |
1985年 | 32篇 |
1984年 | 24篇 |
1983年 | 25篇 |
1982年 | 21篇 |
1981年 | 22篇 |
1980年 | 16篇 |
1979年 | 14篇 |
1978年 | 10篇 |
1977年 | 16篇 |
1976年 | 14篇 |
1975年 | 17篇 |
1974年 | 11篇 |
1973年 | 10篇 |
1971年 | 9篇 |
1970年 | 12篇 |
1968年 | 10篇 |
1966年 | 9篇 |
排序方式: 共有1350条查询结果,搜索用时 15 毫秒
1.
Predictors of clustering of tuberculosis in Greater Vancouver: a molecular epidemiologic study 总被引:3,自引:0,他引:3
下载免费PDF全文
![点击此处可从《Canadian Medical Association journal》网站下载免费的PDF全文](/ch/ext_images/free.gif)
2.
3.
R J Elwood P J Hildebrand J W Dundee P S Collier 《British journal of clinical pharmacology》1983,15(6):743-745
In a randomised crossover study in volunteers plasma midazolam levels were estimated for 24 h following 15 mg by mouth, either preceded by no medication or following 24 h therapy with ranitidine. Administration of the H2-receptor blocker significantly increased bioavailability of the benzodiazepine and resulted in higher plasma levels for the first 6 h after taking midazolam. This was accompanied by a greater soporific effect. 相似文献
4.
A cohort of 1163 pregnant women in two small towns in South Wales, UK, was identified and followed until the children born to them were five years of age. Growth in these children is described and a number of determinants identified. Social-class differences were very small at birth but differences in height became clear by the age of two years and in head circumference before this. In height the differences were largely accounted for by greater growth in social class I, but there was a gradient in head circumference throughout all the social classes. The social class effects gradually increased as the children became older. Parity of the mothers had a small effect on size at birth but age of the mother had no effect once parity was allowed for. Data on illnesses in the children were collected but no effect on growth could be detected. By far the most important determinant of growth which could be controlled is maternal smoking. About 40% of the women smoked, about 17% heavily (15 or more cigarettes per day) and the prevalence of smoking altered little during pregnancy. There was a graded effect of smoking on growth up to a 9% deficit in birth-weight, a 2% deficit in length at birth and a 1.5% deficit in head circumference in the babies born to the mothers who smoked most heavily (25 or more cigarettes per day) compared with non-smokers. There effects decreased with age but there were still residual effects at age five years. 相似文献
5.
PC Chamyal A Mehta SL Ojha JR Bhardwaj 《Indian journal of otolaryngology and head and neck surgery》1991,43(1):26-27
Primary tuberculous pathology in nasolpolypi is a rare condition. A case of bilateral ethmoidal polypi with tubercular lesion diagnosed on histopathologlcal examination is being reported and the available relevant literature has been reviewed. 相似文献
6.
We reviewed all 341 cases of abdominal tuberculosis reported in Canada between 1970 and 1981. Over the study period abdominal tuberculosis accounted for a stable proportion (0.8%) of all reported cases of tuberculosis in Canada. Its incidence declined steadily. It was more common in women, in native Indians and in people born in Asia. Detailed records of the 55 cases reported to Statistics Canada from British Columbia and of an additional 31 cases not reported to Statistics Canada (usually because they involved concomitant disease elsewhere, notably the lungs) were studied. Five of the 55 cases reported to Statistics Canada had been reported incorrectly. Of the 81 cases in British Columbia 51% involved peritonitis, 21% ileocecal disease, 20% anorectal disease, 10% mesenteric lymphadenitis, 1% disease of the sigmoid colon and 1% disease of the liver. The rate of bacteriologic confirmation was low (51%). 相似文献
7.
8.
Random samples of residents in North Wales, some of whom had been seen in 1976 and others in 1981, were seen again in 1984. Blood lead estimations indicated that there had been a fall of about 5% per year. This is similar to the fall we estimated from two previous studies in Wales and is comparable to changes described in the USA and New Zealand. 相似文献
9.
10.
目的:对临床确诊糖尿病患同时测定血清葡萄糖(Glu)及糖化血清蛋白(GSP)的含量,观察二的关系,以及糖化血清蛋白水平对于评价近期(2—3周)糖尿病患血糖在体内变化的临床意义进行了观察。方法:血清葡萄糖、糖化血清蛋白测定均采用酶法测定。结果:178例糖尿病患Glu、GSP均正常3l例占17.4%;Glu、GSP均增高107例占60.1%;Glu正常、GSP增高15例占8.43%;Glu增高、GSP正常25例占14%。结论:糖化血清蛋白的含量不受即时血糖的影响,二的变化不成比例性,对评价糖尿病患2~3周病情的控制是一项灵敏可靠的指标,尤其对于住院病人的治疗与监控有一定的意义。 相似文献