全文获取类型
收费全文 | 24064篇 |
免费 | 1978篇 |
国内免费 | 1133篇 |
专业分类
耳鼻咽喉 | 240篇 |
儿科学 | 128篇 |
妇产科学 | 470篇 |
基础医学 | 814篇 |
口腔科学 | 170篇 |
临床医学 | 2116篇 |
内科学 | 1513篇 |
皮肤病学 | 234篇 |
神经病学 | 533篇 |
特种医学 | 540篇 |
外国民族医学 | 6篇 |
外科学 | 1593篇 |
综合类 | 4677篇 |
现状与发展 | 2篇 |
预防医学 | 940篇 |
眼科学 | 804篇 |
药学 | 7857篇 |
27篇 | |
中国医学 | 3913篇 |
肿瘤学 | 598篇 |
出版年
2024年 | 70篇 |
2023年 | 250篇 |
2022年 | 488篇 |
2021年 | 754篇 |
2020年 | 696篇 |
2019年 | 581篇 |
2018年 | 800篇 |
2017年 | 870篇 |
2016年 | 989篇 |
2015年 | 890篇 |
2014年 | 2023篇 |
2013年 | 1863篇 |
2012年 | 2101篇 |
2011年 | 2184篇 |
2010年 | 1635篇 |
2009年 | 1344篇 |
2008年 | 1225篇 |
2007年 | 1293篇 |
2006年 | 1178篇 |
2005年 | 1030篇 |
2004年 | 753篇 |
2003年 | 669篇 |
2002年 | 578篇 |
2001年 | 477篇 |
2000年 | 361篇 |
1999年 | 311篇 |
1998年 | 235篇 |
1997年 | 199篇 |
1996年 | 173篇 |
1995年 | 152篇 |
1994年 | 134篇 |
1993年 | 96篇 |
1992年 | 72篇 |
1991年 | 97篇 |
1990年 | 79篇 |
1989年 | 53篇 |
1988年 | 59篇 |
1987年 | 42篇 |
1986年 | 29篇 |
1985年 | 59篇 |
1984年 | 50篇 |
1983年 | 36篇 |
1982年 | 37篇 |
1981年 | 32篇 |
1980年 | 17篇 |
1979年 | 27篇 |
1978年 | 23篇 |
1977年 | 17篇 |
1976年 | 11篇 |
1975年 | 13篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
71.
The Effect of 50 Hz External Electrical Interference on Implanted Cardiac Pacemakers 总被引:2,自引:0,他引:2
GERALD C. KAYE GHAZWAN S. BUTROUS ALI ALLEN STUART J. MELDRUM JOHN G. MALE † A. JOHN CAMM 《Pacing and clinical electrophysiology : PACE》1988,11(7):999-1008
The effects of injected 50 Hz alternating current on the function of cardiac pacemakers has been observed in 18 patients with implanted unipolar VVI units. Current, in the range 0-600 microA was applied via electrodes attached to the patients' upper body and feet and fed from a specially designed current injection unit at the bedside. Most implanted pacemakers reverted to interference mode in the current range 29-250 microA. At current levels just below the reversion current all units developed irregular and inappropriate pacing. This current level was pacemaker dependent and varied in the range 27-246 microA. The total reversion current depended on the location of the injecting electrodes and on the patients' posture. The sensitivity of the units to injected interference was increased by deep inspiration. Temporary pacing catheters fitted to an additional ten patients were used to monitor the interference voltage which would be sensed by an implanted unit. This voltage was similarly dependent on patient posture and on deep respiration. Current injection has proved to be a safe, controllable and reproducible method of testing the sensitivity of implanted pacemakers to 50 Hz external interference. 相似文献
72.
Respiratory symptoms associated with the use of azodicarbonamide foaming agent in a plastics injection molding facility 总被引:1,自引:0,他引:1
L W Whitehead T G Robins L J Fine D J Hansen 《American journal of industrial medicine》1987,11(1):83-92
Respiratory health variables were studied cross-sectionally in 227 employees of a plastics molding facility where numerous complaints had been apparently associated with the use of azodicarbonamide foaming agent in injection molding. Pre- and postshift respiratory status measures and azodicarbonamide concentrations were also obtained for 17 employees. Cross-sectional pulmonary function differences by injection molding status were not observed. Modest decrements in pulmonary function measures were observed between start and end of shift but with no dose-effect relationship. A strong association was observed for injection molding workers for eye/nose/throat irritation, cough, and wheezing. Additionally, wheezing, chest tightness, and symptoms of chronic bronchitis were strongly associated with work in injection molding during periods in which azodicarbonamide was in use. These results suggest respiratory symptom causation by some combination of azodicarbonamide itself, reaction products of azodicarbonamide formed during injection molding, or other unidentified agents uniquely associated with the process of injection molding with azodicarbonamide foaming agent. 相似文献
73.
74.
根据蓝四氮唑与泼尼松生成蓝色产物,并于525nm 波长处测定吸光度。测定条件为:反应管长度为3.8m(0.5mm id);流速为1.6ml/min;反应温度为55±0.5℃;注射样品溶液为100μl;本测定系统的测定速度可达100次/h;线性范围可达0.09mg/ml;检测限量为1.54μg/ml;测定结果的变异系数小于1%。 相似文献
75.
76.
目的 :观察黄芪注射液对充血性心力衰竭 (CHF)的治疗效果。方法 :将 12 7例心衰病人随机分为 2组。对照组 5 5例 ,给予传统治疗心衰药物洋地黄、利尿剂及休息、低盐饮食、吸氧等治疗 ;治疗组 72例 ,在对照组病人用药的基础上加黄芪注射液 40ml ,静脉滴注 ,每日 1次 ,2组均连续用药 15天。结果 :总有效率治疗组 91 7%,对照组 6 7 3%,治疗组效果明显优于对照组 (P <0 0 1) ,且 2组自身对照 ,治疗后好转程度 ,治疗组优于对照组 ,左室射血分数 (LVEF)明显好于对照组。结论 :在常规治疗CHF的同时加用黄芪注射液可显著提高疗效。 相似文献
77.
Yoshinori Uji Arthur Karmen Hiroaki Okabe Keishi Hata Masakazu Miura Kazuyuki Ozaki Mitsuo Minamizaki Tetsushi Shibata Seiichi Inayama 《Journal of clinical laboratory analysis》1994,8(5):267-272
An automated measurement of total and free hydroxyproline in serum or urine is presented that uses flow injection analysis. After exclusion of nonspecific substances, hydroxyproline was oxidized by chloramine- T and L-cysteine with Ehrlich's reagent. The linearity obtained was from 3.8μmole/ L to 1.22 mmole/L with good precision (CV <3%). Comparison of the proposed method with HPLC yielded r = 0.939 as the correlation coefficient. Reference intervals of free and total hydroxyproline are 1.4–9.7 μmole/L, 3.8–27.2 μmole/L for serum, and 10.0–72.5 μmole/L, 25.2–303.6 μmole/L for urine, respectively. Serum free and total hydroxyproline levels in renal osteodystrophy patients on maintenance hemodialysis (N = 71) were significantly higher than in controls (P<0.0001). This method is superior to the use of HPLC with regard to stability of the color reaction. The measurement of serum free and total hydroxyproline is a useful marker for therapeutic observation of renal osteodystrophy patients. © 1994 Wiley-Liss, Inc. 相似文献
78.
Dong Yong-sui 《中国结合医学杂志》1995,(1)
AStudyoftheMechanismofYinzhihuang(菌栀黄)InjectionintheTreatmentofInfantileHepatitisSyndromeDongYong-sui(董永绥);HuangZhi-hua(黄志华);... 相似文献
79.
参芪扶正注射液对淋巴细胞的作用 总被引:11,自引:0,他引:11
目的:观察参芪扶正注射液对淋巴细胞的作用.方法:用参芪扶正注射液处理Jurkat淋巴细胞,通过台盘兰染色计数和流式细胞计观察其对淋巴细胞的作用,用参芪处理过的淋巴细胞分别加入化疗药和肝癌细胞,观察两种细胞的反应.结果:参芪扶正注射液处理过的淋巴细胞,细胞增殖快,有较强的抵抗化疗药诱导凋亡的能力,杀伤肝癌细胞的能力增强.结论:参芪扶正注射液具有多方面的免疫调节作用. 相似文献
80.
目的:建立小牛血清去蛋白注射液的细菌内毒素检查方法。方法:根据2000年版《中国药典》进行试验。结果:小牛血清去蛋白注射液在2mg/ml浓度下进行细菌内毒素检查干扰现象,获得了可靠的数据和结果。结论:本品所采用的细菌内毒素检查方法灵敏、可靠。 相似文献