全文获取类型
收费全文 | 1462415篇 |
免费 | 119739篇 |
国内免费 | 3538篇 |
专业分类
耳鼻咽喉 | 19042篇 |
儿科学 | 48080篇 |
妇产科学 | 42002篇 |
基础医学 | 207299篇 |
口腔科学 | 38838篇 |
临床医学 | 131653篇 |
内科学 | 295578篇 |
皮肤病学 | 34223篇 |
神经病学 | 122384篇 |
特种医学 | 55845篇 |
外国民族医学 | 464篇 |
外科学 | 219300篇 |
综合类 | 33509篇 |
现状与发展 | 3篇 |
一般理论 | 562篇 |
预防医学 | 114075篇 |
眼科学 | 32515篇 |
药学 | 101993篇 |
2篇 | |
中国医学 | 3418篇 |
肿瘤学 | 84907篇 |
出版年
2021年 | 11846篇 |
2019年 | 12746篇 |
2018年 | 17781篇 |
2017年 | 13621篇 |
2016年 | 15242篇 |
2015年 | 17122篇 |
2014年 | 24322篇 |
2013年 | 35764篇 |
2012年 | 49015篇 |
2011年 | 51799篇 |
2010年 | 30316篇 |
2009年 | 28948篇 |
2008年 | 47787篇 |
2007年 | 50477篇 |
2006年 | 51060篇 |
2005年 | 49412篇 |
2004年 | 47144篇 |
2003年 | 44938篇 |
2002年 | 43224篇 |
2001年 | 73646篇 |
2000年 | 75149篇 |
1999年 | 62245篇 |
1998年 | 17661篇 |
1997年 | 15986篇 |
1996年 | 16050篇 |
1995年 | 15208篇 |
1994年 | 13774篇 |
1993年 | 12928篇 |
1992年 | 46254篇 |
1991年 | 43869篇 |
1990年 | 41879篇 |
1989年 | 39878篇 |
1988年 | 36548篇 |
1987年 | 35661篇 |
1986年 | 33160篇 |
1985年 | 31556篇 |
1984年 | 24121篇 |
1983年 | 20302篇 |
1982年 | 12485篇 |
1981年 | 11033篇 |
1979年 | 20918篇 |
1978年 | 14755篇 |
1977年 | 12241篇 |
1976年 | 11502篇 |
1975年 | 11725篇 |
1974年 | 14129篇 |
1973年 | 13655篇 |
1972年 | 12736篇 |
1971年 | 11562篇 |
1970年 | 10972篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
991.
Lumbar subarachnoid catheterization in rats 总被引:3,自引:0,他引:3
An animal model was developed for the study of subarachnoid (spinal) anesthesia and analgesia under unanesthetized, unsedated and unrestrained conditions. Sprague-Dawley rats were anesthetized with intraperitoneal ketamine (75-100 mg.kg-1). A PE10 catheter was inserted under direct vision into the lumbar subarachnoid space, through partial laminectomy of L1 or L2 with or without removal of adjacent intervertebral ligament. One week after surgery, correct position of the catheter was verified by subarachnoid injection of 0.03-0.05 ml of 1.5% lidocaine, which produced temporary hind limb paralysis in all but one animal in 28 consecutive operations. There was neither mortality nor major complication, intraoperatively or postoperatively. Only 2 animals developed minor subcutaneous would infections which responded to incision, drainage and debridement. 相似文献
992.
C P Baveja D Chattopadhya S Kumari K K Dutta S Sehgal 《The Journal of communicable diseases》1989,21(1):59-61
Sixty drinking water samples collected from various sources in different areas of Delhi during epidemic of cholera and gastroenteritis were analysed for bacteriological standards. Only 27 (45 per cent) samples were found to be satisfactory for human consumption. Remaining thirty-three (55 per cent) samples showed presence of coliform organisms with MPN value ranging from 10 to 1800+ per 100 ml. Among these positive samples, 31 (93.9 per cent) samples contained faecal coli. Twenty out of thirty (66.6 per cent) Hand pump, 9 out of 21 (42.8 per cent) Taps 2 out of 4 (50 per cent) Tube well and 2 out of 5 (40 per cent) of miscellaneous sources showed contamination with coliform organisms. 相似文献
993.
A primary intrascrotal mass clinically mimicking a testicular tumor was found to be a desmoid tumor originating from the spermatic cord. To our knowledge, this is the first reported case of a paratesticular desmoid tumor. 相似文献
994.
995.
996.
997.
998.
Rifampin alone or with trimethoprim for contacts of children with Haemophilus influenzae type b infections. 总被引:1,自引:0,他引:1
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)
T Jadavji R Cheung R M Bannatyne C G Prober 《Canadian Medical Association journal》1986,135(4):328-331
We carried out a nonrandomized, unblinded study to compare the efficacy of rifampin alone with that of rifampin in combination with trimethoprim in the eradication of the Haemophilus influenzae type b (HIB) carrier state among contacts of patients with invasive HIB infection. The study population comprised 17 index patients admitted to hospital with severe HIB infections and 233 contacts, 43 of whom had nasopharyngeal colonization with HIB of the same biotype as that of the index patient. Rifampin in a daily dose of 20 mg/kg (maximum 600 mg) for 4 days eradicated the carrier state in 86% of cases, as did the combination of rifampin at the same dosage and trimethoprim in a daily dose of 5 mg/kg (maximum 160 mg) for 4 days. 相似文献
999.
Ineffectiveness of organic calcium channel blockers in antagonizing long-term potentiation 总被引:1,自引:0,他引:1
Evidence has accumulated suggesting that the presence of calcium is critical for development of hippocampal long-term potentiation (LTP). However, there is a paucity of information about whether calcium's role in LTP is pre- or postsynaptic. In the present study, we examined the effectiveness of nitrendipine, verapamil, flunarizine and the benzodiazepine diazepam in: blocking voltage-dependent calcium channels; blocking synaptic transmission; and preventing development of LTP. Using the in vitro slice preparation, we obtained intracellular and extracellular recordings from guinea pig hippocampal CA1 pyramidal cells. At the cellular level, all 4 drugs were ineffective in blocking voltage-dependent calcium spikes (TTX resistant) and the calcium-dependent afterhyperpolarization. Verapamil and diazepam appeared to antagonize synaptic transmission, as reflected in smaller population spike amplitudes. Development of long-term potentiation was not affected by the presence of verapamil, flunarizine and diazepam. Nitrendipine appeared to reduce the percentage of slices exhibiting LTP; however, ethanol, the vehicle used to dissolve nitrendipine, was shown in separate experiments to reduce the percentage of slices exhibiting LTP. These results suggest that neither the organic calcium channel blockers--nitrendipine, verapamil, and flunarizine--nor micromolar concentrations of diazepam are potent blockers of extrasynaptic voltage-sensitive calcium channels in hippocampus. They thus cannot be used to demonstrate a specific pre- or postsynaptic calcium role in LTP. 相似文献
1000.