全文获取类型
收费全文 | 529244篇 |
免费 | 33353篇 |
国内免费 | 614篇 |
专业分类
耳鼻咽喉 | 7216篇 |
儿科学 | 17186篇 |
妇产科学 | 13682篇 |
基础医学 | 86793篇 |
口腔科学 | 14863篇 |
临床医学 | 46826篇 |
内科学 | 95452篇 |
皮肤病学 | 12434篇 |
神经病学 | 36442篇 |
特种医学 | 19116篇 |
外国民族医学 | 63篇 |
外科学 | 80447篇 |
综合类 | 8473篇 |
一般理论 | 118篇 |
预防医学 | 40485篇 |
眼科学 | 12600篇 |
药学 | 41200篇 |
中国医学 | 1006篇 |
肿瘤学 | 28809篇 |
出版年
2018年 | 4933篇 |
2015年 | 4513篇 |
2014年 | 6060篇 |
2013年 | 9549篇 |
2012年 | 13021篇 |
2011年 | 14603篇 |
2010年 | 8463篇 |
2009年 | 7771篇 |
2008年 | 13978篇 |
2007年 | 15107篇 |
2006年 | 15308篇 |
2005年 | 14737篇 |
2004年 | 14439篇 |
2003年 | 13748篇 |
2002年 | 13636篇 |
2001年 | 24411篇 |
2000年 | 25425篇 |
1999年 | 20821篇 |
1998年 | 5467篇 |
1997年 | 4705篇 |
1996年 | 5043篇 |
1995年 | 4625篇 |
1994年 | 4319篇 |
1993年 | 4139篇 |
1992年 | 16088篇 |
1991年 | 16995篇 |
1990年 | 17196篇 |
1989年 | 16534篇 |
1988年 | 15244篇 |
1987年 | 15172篇 |
1986年 | 14221篇 |
1985年 | 13557篇 |
1984年 | 10048篇 |
1983年 | 8627篇 |
1982年 | 4660篇 |
1981年 | 4304篇 |
1979年 | 9775篇 |
1978年 | 7142篇 |
1977年 | 5969篇 |
1976年 | 5826篇 |
1975年 | 6738篇 |
1974年 | 8019篇 |
1973年 | 7481篇 |
1972年 | 7267篇 |
1971年 | 7021篇 |
1970年 | 6469篇 |
1969年 | 6159篇 |
1968年 | 5843篇 |
1967年 | 5294篇 |
1966年 | 4647篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
991.
992.
993.
994.
995.
In order to determine nutritional status and the incidence of malnutrition 700 consecutive adult medical (395) and surgical (305) patients admitted to Groote Schuur Hospital between January and November 1984 were studied. Significant depletion in body weight was observed in 20% of all patients, fat depletion in 30% and muscle depletion in 15%; 40% were hypo-albuminaemia. Intergroup analysis demonstrated that malnutrition was more common in medical than surgical patients, and in non-white patients 38% of coloureds and 42% of blacks were fat depleted. Since malnutrition is associated with enhanced mortality and morbidity rates from any disease state, the results indicate that, particularly in non-white patients, nutritional support should be given greater emphasis in overall patient care. 相似文献
996.
Clinical studies were performed on cefodizime (THR-221, CDZM), a new cephem antibiotic as described below. CDZM was administered to 13 patients in dose levels ranging from 55 to 96 mg/kg/day t.i.d. for 3-7 days (5.5 days on average). These patients included 8 with pneumonia, 2 with tonsillitis, 1 each with bronchitis, phlegmon and urinary tract infection. The overall efficacy rate was 92.3%, i.e., efficacy was excellent in 8, good in 4 and poor in 1. Bacteriological efficacy was 83.3%, i.e., 5 strains of bacteria (Streptococcus pneumoniae 1, Haemophilus influenzae 3, Haemophilus parainfluenzae 1) were eradicated and 1 was unchanged (Enterobacter cloacae, MIC greater than 100 micrograms/ml). Clinical side effect was not observed during the treatment. Laboratory abnormalities were observed in 2 cases, i.e., a slight elevation of GPT and a mild eosinophilia. The above results suggest that CDZM is a useful antibiotic for treating pediatric bacterial infections. 相似文献
997.
998.
999.
1000.
I Sircar B L Duell M H Cain S E Burke J A Bristol 《Journal of medicinal chemistry》1986,29(11):2142-2148
Several N-substituted 3H-indeno[1,2-c]pyridazinones (1-23) and a benzo[h]cinnolinone (24), which were designed as rigid structural modifications of 5-alkyl-4,5-dihydro-6-[4-N-substituted phenyl]-3(2H)-pyridazinones (ib-d), were synthesized and evaluated for positive inotropic activity. Most of these tricyclic pyridazinones (1-11, 14-15, 22-23) demonstrated potent positive inotropic activity comparable to the corresponding phenylpyridazinones related to I. 相似文献