全文获取类型
收费全文 | 209081篇 |
免费 | 18624篇 |
国内免费 | 4510篇 |
专业分类
耳鼻咽喉 | 3257篇 |
儿科学 | 4070篇 |
妇产科学 | 3567篇 |
基础医学 | 16563篇 |
口腔科学 | 7187篇 |
临床医学 | 19231篇 |
内科学 | 20024篇 |
皮肤病学 | 2410篇 |
神经病学 | 10274篇 |
特种医学 | 5684篇 |
外国民族医学 | 13篇 |
外科学 | 20269篇 |
综合类 | 33376篇 |
现状与发展 | 9篇 |
一般理论 | 24篇 |
预防医学 | 28380篇 |
眼科学 | 2002篇 |
药学 | 20303篇 |
336篇 | |
中国医学 | 25900篇 |
肿瘤学 | 9336篇 |
出版年
2024年 | 929篇 |
2023年 | 4190篇 |
2022年 | 7889篇 |
2021年 | 10352篇 |
2020年 | 10146篇 |
2019年 | 11390篇 |
2018年 | 10090篇 |
2017年 | 8654篇 |
2016年 | 7712篇 |
2015年 | 7172篇 |
2014年 | 14108篇 |
2013年 | 14361篇 |
2012年 | 12631篇 |
2011年 | 13514篇 |
2010年 | 10899篇 |
2009年 | 9394篇 |
2008年 | 8704篇 |
2007年 | 8803篇 |
2006年 | 7482篇 |
2005年 | 6325篇 |
2004年 | 5240篇 |
2003年 | 4687篇 |
2002年 | 3611篇 |
2001年 | 3004篇 |
2000年 | 2664篇 |
1999年 | 2175篇 |
1998年 | 1738篇 |
1997年 | 1558篇 |
1996年 | 1252篇 |
1995年 | 1201篇 |
1994年 | 1093篇 |
1993年 | 968篇 |
1992年 | 880篇 |
1991年 | 806篇 |
1990年 | 702篇 |
1989年 | 682篇 |
1988年 | 632篇 |
1987年 | 569篇 |
1986年 | 523篇 |
1985年 | 1781篇 |
1984年 | 2054篇 |
1983年 | 1286篇 |
1982年 | 1706篇 |
1981年 | 1180篇 |
1980年 | 1010篇 |
1979年 | 902篇 |
1978年 | 736篇 |
1977年 | 552篇 |
1976年 | 693篇 |
1975年 | 477篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
991.
本文对27例新生儿缺氧缺血性脑病(HIE)在常规治疗基础上加用脑活素与常规治疗相比较,发现两组治疗结果在统计学上比较差异有显著性(P<0.05),提示脑活素对治疗HIE有一定疗效,可提高治愈率,减少后遗症的发生。 相似文献
992.
L. VITANOVA P. KUPENOVA E. POPOVA L. MITOVA 《Acta physiologica (Oxford, England)》1997,159(3):227-235
The aim of the present work was to investigate the role of GABA and glycine, the two main inhibitory neurotransmitters in the retina, in the spectral sensitivity coding under conditions of light adaptation. To study this question, spectral sensitivity curves, based on the turtle ERG responses to stimuli of different wavelengths, were constructed. The spectral sensitivity curves, obtained before and during treatment with picrotoxin (PT), a GABAA antagonist, or with strychnine (ST), a glycine antagonist, were compared. Both PT and ST increased the b- and d-wave absolute sensitivity in a wavelength-dependent manner. PT significantly changed the shape of the b- and d-wave spectral sensitivity curves and the latter lost their peaks. It is concluded that, under conditions of light adaptation, GABA and glycine took part in the formation of the b- and d-wave spectral sensitivity curves, that both of them exerted an effect on the gain and that, furthermore, GABA had a well pronounced effect on the tuning of the spectral sensitivity curves. 相似文献
993.
994.
I. P. Levshina L. V. Nozdracheva N. N. Shuikin 《Bulletin of experimental biology and medicine》1997,124(2):741-743
Rats with catatonic freezing are characterized by low motor and explorative activity in the open field test and specific pattern
of external respiration, so-called strenuous respiration, which is accompanied by a higher activity of the respiratory enzymes
succinate dehydrogenase and NADH dehydrogenase in the hippocampus and motor cortex. No dependencies on the brain structure
and animal age are noted.
Translated fromByulleten' Eksperimental'noi Biologii i Meditsiny, Vol. 124, No. 8, pp. 138–140, August, 1997 相似文献
995.
996.
Isao Iwamoto Hisamichi Baba Yasunori Koga Noriyuki Uchida Kazuhiko Matsuo Kiyoshi Ishii Toshio Onitsuka Kouichirou Shibata 《Surgery today》1990,20(2):158-162
In order to assess the accuracy of electroencephalography (EEG), in children who have undergone cardiac surgery under simple
deep hypothermia, the relation between IQ or schoolwork achievement and the duration of circulatory arrest was investigated
in 75 such children. Abnormal preoperative EEG's were found in 16 per cent of the children while abnormal postoperative EEG's
were found in 17 per cent. The children were divided into 4 groups, according to pre- and postoperative EEG results. Schoolwork
achievement scores ranged between 3.0 and 3.2, the difference among the groups being insignificant. Moreover, no significant
shift in IQ was found among the groups. Finally, regarding the number of children who were able to go on to a higher level
of education, including high school the college or university, again no significant differences were found among the 4 groups.
In a comparison with the number of such children in neighboring Nagasaki prefecture able to continue on to a higher level
of education, no significant differences were seen either. The findings and statistics of this investigation therefore indicate
that pre- and postoperative EEG's are not always a reliable reference for assessing the prognosis of cerebral activity. 相似文献
997.
对甲状腺机能亢进症(甲亢)患者进行了临床辨证分型,同步观察甲皱微循环及检测TT_3 TT_4 FT_4I、吸~(131)碘率,探讨它们之间的关系。结果表明甲亢患者微循环积分明显高于对照组(P<0.01),但不同类型甲亢的血淤情况亦不相同。心肝火旺型的微循环积分低于气滞痰凝型和血瘀型,但TT_3、TT_4、FT_4I明显增高;气滞痰凝型居中;血淤型的微循环积分明显增高,但TT_3、TT_4、FT_4I低于其他两型。吸~(131)碘率三型间无差异(P>0.05)。 相似文献
998.
999.
B. Acunas I. Rozanes I. Sayi S. Akpinar T. Terzioglu A. Kumbasar E. Gökmen 《European radiology》1995,5(6):599-602
Self-expanding nitinol stents were used in 22 patients for palliative treatment of malignant esophagogastric strictures. All patients but 5 were men (age range 47–75 years). The strictures were caused by squamous cell carcinoma (n = 12), adenocarcinoma (n = 8), and recurrent anastomotic carcinoma (n = 2). No technical failure or procedural complications occurred. After the procedure, the severity of dysphagia decreased at least one grade in all patients. Tumor ingrowth into the stent was seen in 7 patients of 22 (32%). Four of these patients were treated with additional stents, and in 3 patients, due to refusal, only balloon dilations were performed, which caused temporary relief. Tumor ingrowth into the stent was noted from 10 days to 7 months (mean 3 months). This seems to be a disadvantage of nitinol stents. At the end of the study 10 patients had died dead with a mean survival of 3 months (range 1 week to 6 months) and 12 patients were still alive with a mean follow-up of 4 months (range 1–8 months). It is concluded that nitinol stents provide satisfactory palliation in patients with malignant dysphagia with neglectable procedural morbidity and mortality rates. 相似文献
1000.
N. S. Doherty R. J. Griffiths J. P. Hakkinen D. N. Scampoli A. J. Milici 《Inflammation research》1995,44(4):169-177
Intraperitoneal injection of inflammatory agents in the mouse and rat causes plasma protein and leukocyte extravasation into the peritoneal cavity. Following an intraperitoneal injection of zymosan A, the milky spots of the omentum were the only abdominal sites detected where intravenously administered Monastral Blue labeled interendothelial cell gaps responsible for plasma extravasation. In addition, when colored microspheres were intraventricularly administered to quantify blood flow, the omentum was the only abdominal organ which showed an increase in blood flow during zymosan A peritonitis. A combination of light and electron microscopy, plus measurement of myeloperoxidase activity (a marker of neutrophil accumulation) demonstrated that the omental milky spots are the major route through which leukocytes migrate into the peritoneal cavity. Identical structures in the pleura likewise are the sites of protein leakage into the pleural cavity. In contrast, selective sites of protein and cellular extravasation could not be detected in the synovial lining of the inflamed knee joint. 相似文献