全文获取类型
收费全文 | 129303篇 |
免费 | 11291篇 |
国内免费 | 6659篇 |
专业分类
耳鼻咽喉 | 1224篇 |
儿科学 | 1967篇 |
妇产科学 | 2933篇 |
基础医学 | 13510篇 |
口腔科学 | 2686篇 |
临床医学 | 16038篇 |
内科学 | 20184篇 |
皮肤病学 | 1593篇 |
神经病学 | 6404篇 |
特种医学 | 4219篇 |
外国民族医学 | 40篇 |
外科学 | 13371篇 |
综合类 | 19409篇 |
现状与发展 | 20篇 |
一般理论 | 18篇 |
预防医学 | 9464篇 |
眼科学 | 3461篇 |
药学 | 13555篇 |
116篇 | |
中国医学 | 6593篇 |
肿瘤学 | 10448篇 |
出版年
2024年 | 350篇 |
2023年 | 1723篇 |
2022年 | 4044篇 |
2021年 | 5480篇 |
2020年 | 4067篇 |
2019年 | 3713篇 |
2018年 | 3958篇 |
2017年 | 3736篇 |
2016年 | 3322篇 |
2015年 | 5261篇 |
2014年 | 6767篇 |
2013年 | 6962篇 |
2012年 | 10143篇 |
2011年 | 10905篇 |
2010年 | 7495篇 |
2009年 | 6165篇 |
2008年 | 7804篇 |
2007年 | 7742篇 |
2006年 | 7336篇 |
2005年 | 6707篇 |
2004年 | 4850篇 |
2003年 | 4412篇 |
2002年 | 3659篇 |
2001年 | 3100篇 |
2000年 | 2869篇 |
1999年 | 2657篇 |
1998年 | 1316篇 |
1997年 | 1228篇 |
1996年 | 996篇 |
1995年 | 957篇 |
1994年 | 891篇 |
1993年 | 506篇 |
1992年 | 894篇 |
1991年 | 807篇 |
1990年 | 669篇 |
1989年 | 572篇 |
1988年 | 527篇 |
1987年 | 452篇 |
1986年 | 359篇 |
1985年 | 285篇 |
1984年 | 185篇 |
1983年 | 169篇 |
1982年 | 95篇 |
1981年 | 93篇 |
1979年 | 140篇 |
1978年 | 111篇 |
1977年 | 83篇 |
1974年 | 94篇 |
1973年 | 72篇 |
1972年 | 87篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
81.
The multitest CMI system, a disposable device that simultaneously applies seven standardized preloaded antigens and diluent control, is a major advance for measurement of delayed type hypersensitivity (DTH) in assessment of cell-mediated immunity (CMI). The system was tested in 84 healthy volunteers, 42 in each sex, aged 4-62 years, to determine normal values for incidence and size of DTH responses to each of seven antigens. Incidence of positive responses to individual antigens varied from 84.5% to 11%, more than half of volunteers were reactive to Tuberculin, Candida and Diphtheria, and a third to Tetanus, Streptococcus and Tricophyton. 95.3% of volunteers to one or more antigens, and about two thirds to three or more. To better assess CMI, a two-part score based on 48-hour readings was employed. The mean number of positive antigens ranged between 2.2 and 3.3, the mean sum of their millimeter induration ranged between 10.8 and 18.2, the average sum of diameters were 16.7 mm in males and 15.2 mm in females. There was no statistic significance to sex and age during scoring, although there was somewhat higher in males, young and mature age groups. In our series, Tuberculin reaction is the highest one in this seven antigens, about 4.76% of volunteers are anergy. A statistical zone (95% confidence limits) of reduced DTH scores (hypoergy) was identified, it reveals sum of diameters less than 9mm in males and 7mm in females, number of positive antigens are less than 2 in each sex.(ABSTRACT TRUNCATED AT 250 WORDS) 相似文献
82.
[目的]探讨不同起搏模式对病人生存质量(QOL)的影响。[方法]以健康调查问卷(SF一36量表)对112例不同起搏模式病人进行问卷调查,比较3种起搏模式下病人的QOL水平。[结果]除机体疼痛、角色情绪2个维度外其余6个维度(生理功能、角色限制、活力、社会功能、精神健康、总体健康)3种起搏模式间比较差异有统计学意义(P〈0.05)。[结论]应用AAI型、DDD型起搏器的病人生存质量优于VVI型起搏。 相似文献
83.
目的 探讨^99mTC-MIBI动态显像对非小细胞肺癌化疗疗效的预测价值。方法 对确诊为不能手术的非小细胞肺癌患者化疗前,静脉注射740mbq ^99mTC-MIBI后分别于30min,2h行SPECT动态扫描,计算早期/晚期肿瘤组织与对侧正常肺组织的放射活性比(T/Ne,T/Nd),全身采用卡铂/顺铂+VP16化疗3周期,随后复查胸部CT,评判化疗疗效及其与^99mTC-MIBI动态显像的关系。结果 78例NSCLC符合入选标准,并完成化疗方案,66例呈阳性显像,12例阴性显像,66例阳性显像中化疗有效率为90.7%,阴性显像12例中化疗全部进展,两者比较差异有显著性(P〈0.01)。结论 ^99mTC-MIBI动态显像的放射活性越高,化疗效果越好,对非小细胞肺癌化疗疗效有预测价值,可为合理制定治疗方案提供重要依据。 相似文献
84.
C Y Chai A M Lin C K Su S R Hu C Yuan L S Kao J S Kuo D S Goldstein 《Journal of the autonomic nervous system》1991,33(1):35-46
Effects of stimulation of brainstem sites on hemodynamics and plasma catecholamine levels were assessed in cats under chloralose-urethane anesthesia. Pressor areas of the dorsal medulla (DM) and ventrolateral medulla (VLM) and the depressor area of the paramedian reticular nucleus (PRN) were stimulated electrically using a monopolar electrode, or chemically using sodium glutamate microinjection. Plasma levels of norepinephrine (NE) and epinephrine (EPI) were measured in caval blood above the adrenal veins. Electrical stimulation of the DM and VLM produced increases in blood pressure and in plasma NE and EPI levels that were enhanced after acute vagotomies. The NE and EPI responses were attenuated after acute, bilateral adrenalectomies, confirming augmented adrenomedullary secretion, whereas the pressor responses were intact. Injection of sodium glutamate into the same pressor regions of the DM or VLM also produced pressor responses and elevated plasma catecholamine levels, indicating that the responses resulted from activation of neuronal perikarya. Stimulation of the PRN attenuated pressor and catecholamine responses during stimulation of the DM and VLM. The results indicate that pressor responses during stimulation of the DM and VLM are due at least partly to activation of perikarya in these regions, are associated with but not dependent on adrenomedullary activation, and are enhanced after vagotomy; and that neurons of the PRN exert inhibitory modulation of the pressor and adrenomedullary responses during stimulation of VLM and DM. 相似文献
85.
本文介绍了20例二尖瓣置换术病人围手术期使用硝普钠的经验。术中和术后早期使用硝普钠可降低肾素-血管紧张素系统的活性、减轻外周血管阻力和后负荷,增强泵血功能,从而使心脏指数升高,降低术后高血压和肺水种的发生率。体外循环停止后,硝普钠与低浓度升压药并用可增强心肌收缩力,预防低排综合征 相似文献
86.
J Lin Z-H Liu W Chen Z Jia D Pan Y Fu F Zhang A Xu 《European journal of immunogenetics》2002,29(4):335-336
A new DRB1 allele, DRB1*0902, has been identified in an individual of the Jing ethnic minority. Its sequence was confirmed by sequencing of PCR products and clones. This allele differed by three nucleotides from DRB1*09012 at positions 157, 161 and 166, and resulted in amino acid motif substitution from VAES to DAEY. 相似文献
87.
88.
Linda Laatsch Thomas Jobe Jerry Sychra Qing Lin Michael Blend 《Brain injury : [BI]》1997,11(12):851-864
Three patients,with known brain injury and neuropsychological impairments, are followed through an individualized cognitive rehabilitation programme and post discharge from the treatment programme. Single Photon Emission Computed Tomography (SPECT) of the brain was employed to evaluate resting relative cerebral blood flow (rCBF) during the process of recovery from brain injury. All patients experienced significant improvements on measures of neuropsychological functioning and improvements in rCBF during this longitudinal study. The specific changes in rCBF appear to be related to the location of the patient s brain injury and strategies particular to cognitive rehabilitation therapy. Continued improvements in rCBF, functional abilities, and cognitive skills were documented in these three cases up to 45 months post brain injury. 相似文献
89.
90.
Kousaku Matsubara M.D. Kei Suzuki M.D. Ying Wei Lin M.D. Toshiyuki Yamamoto M.D. Shigeru Ohta M.D. 《Pediatrics international》1991,33(4):482-487
We present two female siblings with familial juvenile nephronophthisis (FJN) which was diagnosed at the early stage of renal failure. Diagnosis was made during the investigation of anemia in case 1 and by a subsequent family survey in case 2. Most patients with FJN are not identified until the terminal stage of renal failure and such cases have rarely been reported in Japan. Case 2 had a reduction in the maximum urinary concentration ability but no azotemia, and among the FJN patients reported in Japan so far she has the least advanced renal disease. Histological examination of the renal biopsy in case 1 showed typical findings of FJN, such as thickening and lamination of the tubular basement membrane (TBM), interstitial fibrosis, and round cell infiltration of the interstitium. In case 2, renal biopsy revealed an irregular marked thickening of the TBM with trivial interstitial changes and a normal glomerular appearance. The histology of these two cases suggests that the TBM may be the primary site affected in FJN. 相似文献