全文获取类型
收费全文 | 161329篇 |
免费 | 12849篇 |
国内免费 | 3740篇 |
专业分类
耳鼻咽喉 | 2818篇 |
儿科学 | 9919篇 |
妇产科学 | 4192篇 |
基础医学 | 17215篇 |
口腔科学 | 1980篇 |
临床医学 | 16847篇 |
内科学 | 28392篇 |
皮肤病学 | 2861篇 |
神经病学 | 13020篇 |
特种医学 | 3589篇 |
外国民族医学 | 3篇 |
外科学 | 14066篇 |
综合类 | 21512篇 |
现状与发展 | 19篇 |
一般理论 | 8篇 |
预防医学 | 14746篇 |
眼科学 | 2555篇 |
药学 | 9017篇 |
93篇 | |
中国医学 | 12032篇 |
肿瘤学 | 3034篇 |
出版年
2024年 | 398篇 |
2023年 | 2745篇 |
2022年 | 5122篇 |
2021年 | 8118篇 |
2020年 | 8638篇 |
2019年 | 6170篇 |
2018年 | 6052篇 |
2017年 | 5816篇 |
2016年 | 5986篇 |
2015年 | 5817篇 |
2014年 | 10974篇 |
2013年 | 11413篇 |
2012年 | 8907篇 |
2011年 | 10086篇 |
2010年 | 7932篇 |
2009年 | 7695篇 |
2008年 | 7432篇 |
2007年 | 7623篇 |
2006年 | 6851篇 |
2005年 | 5697篇 |
2004年 | 4733篇 |
2003年 | 4190篇 |
2002年 | 2984篇 |
2001年 | 2795篇 |
2000年 | 2371篇 |
1999年 | 2163篇 |
1998年 | 1826篇 |
1997年 | 1665篇 |
1996年 | 1554篇 |
1995年 | 1511篇 |
1994年 | 1287篇 |
1993年 | 1173篇 |
1992年 | 1093篇 |
1991年 | 850篇 |
1990年 | 797篇 |
1989年 | 648篇 |
1988年 | 662篇 |
1987年 | 592篇 |
1986年 | 505篇 |
1985年 | 764篇 |
1984年 | 705篇 |
1983年 | 479篇 |
1982年 | 556篇 |
1981年 | 534篇 |
1980年 | 408篇 |
1979年 | 380篇 |
1978年 | 292篇 |
1977年 | 209篇 |
1976年 | 226篇 |
1975年 | 149篇 |
排序方式: 共有10000条查询结果,搜索用时 265 毫秒
991.
S. Hussey P. H. Gibson R. A. Elton C. M. Yates J. E. Christie P. A. M. Eagles A. Gordon 《Acta neuropathologica》1988,75(5):495-501
Summary Temporal cortex from 14 cases of Alzheimer-type dementia and 6 cases of Down's syndrome, all selected for severe Alzheimer pathology, was homogenised in distilled water, NaOH, or sodium dodecylsulphate (SDS) containing 0.1% -mercaptoethanol. The homogenates were stained with Congo red, and the neurofibrillary tangles and plaque cores were counted under crossed-polarisation microscopy. The number of tangles and plaque cores in the water-treated extracts was not related to age, sex, postmortem interval or duration of dementia. The number of tangles after extraction in SDS or NaOH, as a percentage of tangles in water-treated extracts, was 57±25 (mean±SD) for 1% SDS, 43±17 for 5% SDS and 37±22 for 0.2 M NaOH. Plaque cores were essentially insoluble in all three agents. The percentage of tangles insoluble in 1% SDS did not correlated with age or post-mortem interval but decreased with increasing duration of dementia. Enhanced tangle solubility with increasing duration of dementia suggests that the nature of tangles changes with time; one possibility is that this reflects transformation of intracellular to extracellular tangles. Paired helical filament (PHF) length and the number of repeats per PHF were measured in electron micrographs of PHF prepared with and without treatment by 1% SDS. There was no significant multimodality of PHF length to suggest that PHF broke at regular intervals. The mean repeat length (PHF length/number of repeats) was greater for PHF isolated in the presence of 1% SDS than in its absence, showing that SDS affects ultrastructure by untwisting PHF. An untwisting process may also occur in vivo producing the straight filaments found, together with PHF, in tangles and neurites.Supported by Miss E. Buchan (to the MRC Brain Metabolism Unit) and the British Foundation for Age Research and the Wellcome Trust (to P. A. M. Eagles). S. Hussey was in receipt of an MRC Partnership Award. 相似文献
992.
Y. Suzuki B. Robertson M.D. Y. Fujita G. Grossmann 《Acta anaesthesiologica Scandinavica》1988,32(4):283-289
Hybridoma cells were obtained by fusing spleen cells from mice, immunized against the 15 kDa porcine surfactant apoprotein, with a myeloma cell line. Adult mice were inoculated intraperitoneally with this hybridoma; mice that were not inoculated or were inoculated with myeloma cells served as controls. Lung-thorax compliance was measured at various intervals after inoculation. The animals were then killed for histologic-morphometric evaluation of alveolar air expansion, inflammatory reaction in the pulmonary parenchyma, and intraalveolar edema. In the hybridoma group, the mice developed respiratory failure 9 days after inoculation, with markedly reduced lung-thorax compliance, lung congestion, alveolar collapse, hemorrhagic pulmonary edema, and hyaline membranes. Morphometric data from the same animals showed reduced volume density of alveolar air, and increased volume densities of intraalveolar "fluid" (edema) and tissue components. These lung lesions are similar to those in the adult respiratory distress syndrome. 相似文献
993.
Israel Zelikovic Shermine Dabbagh Aaron L. Friedman David T. Uehling Russell W. Chesney 《Pediatric nephrology (Berlin, Germany)》1988,2(4):512-514
A boy aged 4.5 years with prune-belly syndrome (PBS) and associated urethral stenosis, oligohydramnios, imperforate anus and vesicosigmoid fustula is described. In contrast to the anticipated poor prognosis, vesicostomy and divided transverse colostomy performed after birth followed by prophylaxis of infection and bicarbonate supplementation have resulted in a good outcome. The vesicosigmoid fistula might have served in utero as a natural diversion protecting from pressure-induced renal damage. It is suggested that the main determinant of prognosis in PBS is the presence and degree of kidney dysplasia at birth as reflected by the neonatal renal function after performance of an indicated urinary diversion procedure rather than the presence of severe associated anomalies.Supported in part by grants from the National Institute of Health AM 37223-01 and the Medical School and Graduate School Research Committees of the University of Wisconsin and a Research Career Development Award KO4 AM 00421 (RWC), by the Pearl M. Stetler Foundation (SD) and by a National Kidney Foundation fellowship (IZ) 相似文献
994.
995.
赵连城 《中国医科大学学报》1988,(6)
本文介绍了自制“茎突分离保护器”的质地、规格、性能。茎突截短术应用代用器械手术18例,每侧截除长度平均为1.75cm;应用自制器械30例,每侧平均截除长度为2.52cm,且比代用器械每侧可缩短手术时间30~40分钟。文章还评价了包括颈外切开的6例,共54例手术的疗效。 相似文献
996.
997.
顾同进 《中国新药与临床杂志》1988,(3)
本文报告11例绿脓杆菌感染,其中呼吸道感染9例,胆囊切除术后合并胆道感染2例。因经大多数抗生素治疗无效,少数因有毒性或过敏不能继续或调用有效抗生素,最后才改用头孢他啶治疗。经7-20d的疗程,所有病例均取得一定疗效。显效率为56%。未出现明显副反应。但本药售价昂贵,故应作为抢救危重绿脓杆菌感染的病例之用 相似文献
998.
An outbreak of cholera in a refugee camp in Africa 总被引:1,自引:0,他引:1
C. Djeddah A. Miozzo M. Di Gennaro F. Rosmini P. Martino P. Pasquini 《European journal of epidemiology》1988,4(2):227-230
A total of 541 cases of cholera were observed between May 7 and July 19, 1985 among the 9,929 displaced persons present in a refugee camp in Africa.In spite of malnutrition and other diseases affecting this population, only 12 deaths occurred.Antiepidemic measures consisted of preparation of isolation-wards, treatment of contaminated materials, training of refugees and patient care. Mass prophylaxis, initially considered, was dropped before the end of the epidemic.Corresponding author. 相似文献
999.
Hisataka Sakakibara Yasuhiro Akamatsu Masaru Miyao Taka'aki Kondo Masashi Furuta Shin'ya Yamada Noriaki Harada Shigenobu Miyake Migiwa Hosokawa 《International archives of occupational and environmental health》1988,60(4):285-289
Summary The correlation was investigated between the frequency of attacks of vibration-induced white finger (VWF) and numbness or coldness of the fingers and legs in patients with vibration syndrome. Some 1687 patients with vibration syndrome were examined and of these 342 chain-saw operators and 277 rock-drill operators had no disease other than vibration snydrome. Then subjects were matched by age and period of treatment within three years. In the last analysis, 20 in the VWF almost everyday group or in the never group, and 40 in the occasionally group were selected from the chain-saw operators, and from the rock-drill operators 32 in the VWF everyday or the never group and 64 in the occasionally group. The present study showed that, with the frequency of VWF attacks, patients had a higher prevalence of coldness not only in the fingers but also in the legs. These findings suggest a correlation between the severity of circulatory disturbances of the upper extremities and that of the lower ones in patients with vibration syndrome. Further studies on circulatory disturbances in the leg are required. 相似文献
1000.
背景 既往研究显示ACAT-1 rs1044925单核苷酸多态性(SNP)与冠心病及缺血性脑卒中的发病风险相关,并且与血脂水平有关。目的 本研究旨在探讨ACAT-1 rs1044925 SNP与急性冠脉综合征(ACS)的关系,以及rs1044925 SNP与ACS患者阿托伐他汀治疗后调脂效果的关系。方法 选择2016年1月—2018年1月在广西壮族自治区人民医院老年心血管内科确诊为ACS并接受经皮冠状动脉介入治疗(PCI)的患者111例作为ACS组(男67例,女44例);患者均接受阿托伐他汀治疗,20 mg/晚;同时服用氯吡格雷75 mg,1次/d(或替格瑞洛90 mg,2次/d),阿司匹林100 mg,1次/d;并在经PCI后常规使用阿托伐他汀,20 mg/晚。对照组为同期体检健康人群,共338例(男170例,女168例)。通过聚合酶链反应和限制性片段长度多态性(PCR-RFLP)对ACAT-1 rs1044925 SNP进行基因分型,检测ACS组和对照组的基线血脂水平,随访检测ACS组患者阿托伐他汀治疗1年后血脂参数。结果 ACS组和对照组受检者的血清总胆固醇(TC)间差异无统计学... 相似文献