全文获取类型
收费全文 | 13978篇 |
免费 | 996篇 |
国内免费 | 250篇 |
专业分类
耳鼻咽喉 | 100篇 |
儿科学 | 239篇 |
妇产科学 | 133篇 |
基础医学 | 1350篇 |
口腔科学 | 444篇 |
临床医学 | 1467篇 |
内科学 | 2315篇 |
皮肤病学 | 998篇 |
神经病学 | 978篇 |
特种医学 | 341篇 |
外国民族医学 | 2篇 |
外科学 | 512篇 |
综合类 | 1712篇 |
现状与发展 | 3篇 |
一般理论 | 1篇 |
预防医学 | 1330篇 |
眼科学 | 1096篇 |
药学 | 1373篇 |
3篇 | |
中国医学 | 197篇 |
肿瘤学 | 630篇 |
出版年
2024年 | 25篇 |
2023年 | 161篇 |
2022年 | 343篇 |
2021年 | 491篇 |
2020年 | 431篇 |
2019年 | 413篇 |
2018年 | 393篇 |
2017年 | 406篇 |
2016年 | 448篇 |
2015年 | 481篇 |
2014年 | 811篇 |
2013年 | 956篇 |
2012年 | 808篇 |
2011年 | 874篇 |
2010年 | 712篇 |
2009年 | 654篇 |
2008年 | 721篇 |
2007年 | 682篇 |
2006年 | 598篇 |
2005年 | 510篇 |
2004年 | 472篇 |
2003年 | 381篇 |
2002年 | 319篇 |
2001年 | 299篇 |
2000年 | 226篇 |
1999年 | 228篇 |
1998年 | 225篇 |
1997年 | 177篇 |
1996年 | 164篇 |
1995年 | 149篇 |
1994年 | 133篇 |
1993年 | 129篇 |
1992年 | 124篇 |
1991年 | 101篇 |
1990年 | 100篇 |
1989年 | 104篇 |
1988年 | 99篇 |
1987年 | 85篇 |
1986年 | 87篇 |
1985年 | 127篇 |
1984年 | 121篇 |
1983年 | 81篇 |
1982年 | 77篇 |
1981年 | 64篇 |
1980年 | 54篇 |
1979年 | 51篇 |
1978年 | 40篇 |
1977年 | 24篇 |
1976年 | 16篇 |
1975年 | 26篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
101.
目的:观察并比较AT LISA tri 839MP三焦点人工晶状体及CT SPHERIS 209M单焦点人工晶状体植入术后白内障患者的视力、对比敏感度和视觉质量。
方法:行白内障超声乳化摘除联合人工晶状体植入术的患者52例52眼,其中三焦点组26例26眼,术中植入AT LISA tri 839MP三焦点人工晶状体; 单焦点组26例26眼,术中植入CT SPHERIS 209M单焦点人工晶状体。术后3mo检查患者的裸眼远距离视力(UCDVA)、裸眼中距离视力(UCIVA)、裸眼近距离视力(UCNVA)、最佳矫正远视力(BCDVA)、远视力矫正下的中距离视力(DCIVA)、远视力矫正下的近距离视力(DCNVA),明、暗环境中不同空间频率(3、6、12、18c/d)下的对比敏感度,并进行脱镜率、不良视觉症状和满意度等问卷调查。
结果:术后3mo三焦点组UCIVA、UCNVA、DCIVA和DCNVA、脱镜率及满意度均优于单焦点组(P<0.05)。在暗环境中的18c/d空间频率,单焦点组的对比敏感度优于三焦点组(P=0.041)。两组均有轻度眩光和光晕不适主诉(P=0.668)。
结论:AT LISA tri 839MP三焦点人工晶状体较CT SPHERIS 209M单焦点人工晶状体为患者提供了更好的中、近视力,脱镜率和满意度均高于单焦点人工晶状体。 相似文献
102.
目的观察吡格列酮对糖耐量受损(IGT)合并代谢综合征(MS)患者超敏C反应蛋白(hsC-RP)的影响。方法对2005年1月至2007年12月厚街医院内科门诊50例新诊断IGT(7.8mmol/L≤餐后2h血糖<11.1mmol/L)合并MS患者,采用吡格列酮干预,比较治疗前和治疗12周后超敏C反应蛋白(hsC-RP)浓度变化。结果治疗前后空腹血糖、HbAlc、胰岛素、HOMA-IR、TG及hsC-RP水平均有明显降低(P<0.01),HDL-C明显升高(P<0.01)。结论吡格列酮改善胰岛索抵抗,降低hs-CRP浓度,改善MS患者的血管炎症反应。 相似文献
103.
104.
目的探讨脑梗死患者血清高敏C反应蛋白(hsCRP)含量的变化及其临床意义。方法随机选择57例脑梗死患者,检测其高敏C反应蛋白的血清水平。观察脑梗死不同病情含量变化,并分析与患者临床神经功能缺损程度评分的相关性。结果脑梗死患者的血清hsCRP水平明显高于正常对照组(P<0.01)。脑梗死不同临床分型组间血清hsCRP水平比较,重型组明显高于中型、轻型组,差异均有统计学意义(P<0.01)。脑梗死患者血清hsCRP含量与临床神经功能缺损程度评分呈正相关(r=0.255,P<0.05)。结论血清hsCRP水平增高与脑组织受损程度有密切关系。hsCRP升高可能是脑梗死发病的一个危险因素。hsCRP升高对治疗及估计预后有指导意义。 相似文献
105.
Tong Zhu Yi Jiang Ting Liu Jinqi Xue Nan Niu Jiawen Bu Mingxin Liu Caigang Liu Xudong Zhu Xi Gu 《International journal of medical sciences》2022,19(5):901
Breast surgery is an important treatment for women with malignant breast diseases. In addition to breast appearance, the integrity of breast function is increasing in patients with breast diseases. As the basis of breast physiological function, breast skin sensitivity is important to the quality of life of patients after surgery. Breast skin sensitivity gives the patient a “real” breast feeling. The sensory recovery after breast surgery has also become one of the important goals of breast surgery. In this review, we aim to discuss the research progress on recovery of breast skin sensitivity after different treatment modalities for breast disease. 相似文献
106.
Georgios Manessis Maciej Frant Grzegorz Wozniakowski Lapo Nannucci Martina Benedetti Lilla Denes Balka Gyula Athanasios I. Gelasakis Clare Squires Sara Recuero Carlos Sanchez Amadeu Griol Alessandro Giusti Ioannis Bossis 《Viruses》2022,14(5)
Swine viral diseases challenge the sector’s sustainability by affecting productivity and the health and welfare of the animals. The lack of antiviral drugs and/or effective vaccines renders early and reliable diagnosis the basis of viral disease management, underlining the importance of point-of-care (POC) diagnostics. A novel POC diagnostic device utilizing photonic integrated circuits (PICs), microfluidics, and information and communication technologies for the detection of porcine reproductive and respiratory syndrome virus (PRRSV) and swine influenza A (SIV) was validated using spiked and clinical oral fluid samples. Metrics including sensitivity, specificity, accuracy, precision, positive likelihood ratio (PLR), negative likelihood ratio (NLR), and diagnostic odds ratio (DOR) were calculated to assess the performance of the device. For PRRSV, the device achieved a sensitivity of 83.5%, specificity of 77.8%, and DOR values of 17.66, whereas the values for SIV were 81.8%, 82.2%, and 20.81, respectively. The POC device and PICs can be used for the detection of PRRSV and SIV in the field, paving the way for the introduction of novel technologies in the field of animal POC diagnostics to further optimize livestock biosecurity. 相似文献
107.
[目的]探讨颈动脉粥样硬化的中医临床常见证型间相关生化指标是否存在差异性。[方法]采集511例颈动脉粥样硬化患者中医证候,检测全套血脂、空腹血糖、空腹胰岛素,经多元统计学分析得出临床常见证型,比较不同证型间检测实验室指标的差异性。[结果]肝肾阴虚型血清极低密度脂蛋白胆固醇(VLDL-C)均值最高,其次为肾虚气滞型。肾虚气滞型APOB均值最高,其次为肾虚痰浊型。血清甘油三酯(TG)、血清总胆固醇(TC)、血清高密度脂蛋白胆固醇(HDL-C)、血清低密度脂蛋白胆固醇(LDL-C)、载脂蛋白A(APOA)、脂蛋白(a)[LP(a)]、空腹血糖(FPG)、空腹胰岛素(FIN)、胰岛素敏感指数(ISI)无组间差异性(P0.05)。[结论]各证型间VLDL-C、APOB差异有统计学意义(P0.05)。 相似文献
108.
2010-2013年柳州市工人医院血液科革兰阴性菌的分布与耐药性分析 总被引:2,自引:0,他引:2
目的了解广西柳州市工人医院2010-2013年血液科常见革兰阴性菌的分布及耐药趋势,以指导临床合理使用抗菌药物。方法对2010年1月-2013年12月广西柳州市工人医院血液科送检分离出的病原菌菌株及其耐药性进行回顾性调查分析。结果共分离出常见的革兰阴性菌508株,主要以大肠埃希菌和肺炎克雷伯菌为主,分别占26.2%、21.7%;铜绿假单胞菌和鲍曼不动杆菌检出率分别为16.5%、13.6%。超广谱β-内酰胺酶检测结果显示,肺炎克雷伯菌和大肠埃希菌的平均检出率分别为40.2%、60.5%。阴沟肠杆菌、肺炎克雷伯菌和大肠埃希菌对碳青霉烯类抗菌药物总体上有较高的敏感性;铜绿假单胞菌、鲍曼不动杆菌对多数抗菌药物高度耐药,且呈逐年上升趋势。结论血液科临床分离的革兰阴性菌的比例较高,对常用抗菌药物耐药严重,应加强革兰阴性杆菌耐药性的动态监测,以指导临床进行合理规范的抗感染治疗。 相似文献
109.
Changes in Corneal Subbasal Nerve Morphology and Sensitivity During Orthokeratology: Onset of Change
Purpose
To investigate changes in corneal subbasal nerve fiber density and orientation during a 3-month orthokeratology (OK) lens wear period and their relationship with concurrent changes in corneal sensitivity.Methods
Sixteen subjects wore overnight OK lenses for 90 days and were assessed at baseline, Day 30, and Day 90. Nerve images at the corneal apex and temporal mid-periphery were captured from the right eye only using in vivo confocal microscopy and analyzed to calculate nerve fiber density (NFD) and global nerve fiber orientation (GNFO). Corneal sensitivity was measured using the Cochet-Bonnet aesthesiometer at similar corneal locations. Control groups of non-lens (NL) wearing and conventional rigid gas-permeable (GP) lens-wearing subjects were also examined.Results
Significant changes in NFD, GNFO and corneal sensitivity were observed during OK lens wear over the study period. In the central cornea, both NFD and corneal sensitivity decreased by Day 30, with further reductions at Day 90. Reduced NFD was associated with reduced corneal sensitivity. In the mid-peripheral cornea only, GNFO was rotated in a clockwise direction at Day 30, with further rotation at Day 90. Corneal sensitivity reduction plateaued by Day 30. In the GP lens-wearing subjects, only corneal sensitivity decreased by Day 30 at both corneal locations. No changes were observed in the NL control subjects.Conclusions
Alterations in corneal nerve morphology occur rapidly with commencement of OK lens wear and appear to underpin functional sensitivity loss. Nerve fiber orientation can provide a useful index for changes in corneal nerve morphology. 相似文献110.
目的 观察波前像差引导的个体化切削治疗高度近视患者手术前后视力、对比敏感度、眩光以及波前像差的变化,评价其对视觉质量的影响.方法 回顾性病例研究.对2007年10月至2008年10月在武警河南总队医院眼科就诊,选取屈光度为-6.0≤球镜≤-10.0D,柱镜≤-2.0D的高度近视患者200例(380只眼)行波前像差引导的个体化切削,手术治疗区直径均>6.0mm.检查术前及术后1周、1月、3月及6月患者的裸眼视力、屈光度、对比敏感度和波前像差.统计分析使用SPSS11.0软件包的独立样本进行t检验.结果 波前像差引导的个体化切削患者术后裸眼视力均达到术前矫正视力,部分患者比术前矫正视力提高2行;术后1周高阶像差增加,术后1月和3月逐渐降低,术后3月和术前比较差异仍有统计学意义(P<0.05);术后1周各空间频率的对比敏感度及眩光敏感度与术前比较均明显下降,差异有统计学意义(P<0.05),术后3月时各空间频率对比敏感度和眩光敏感度均有恢复,低频率段恢复至接近术前水平,中、高频率段恢复较慢.和术前比较差异仍有统计学意义(P<0.05).结论 波前像差引导的个体化切削有效地提高高度近视患者的远视力,部分患者可以获得超常视力,但是术后仍有高阶像差的增加和对比敏感度的下降.Abstract: Objective To observe the pre and postoperative changes of visual quality, contrast
sensitivity (CS), glare contrast sensitivity (GCS) and wavefront aberration in high myopic patients who received wave-front guided customized ablation (WAGCA). Methods It was a retrospective case series. High myopic patients were collected in Henan peoples armed police corps hospital from October,2007 to October, 2008. A total of 380 eyes in 200 high myopic patients with preoperative spherical refraction of -6.0 D to -10.0 D and astigmatism <2 D received WAGCA. The ablation zone was >6.0mm. The uncorrected visual acuity (UCVA), CS, GCS and corneal wave-front aberrations were analyzed before surgery and at 1 week, 1 month and 3 months postoperatively. Results After WAGCA,uncorrected visual acuity (UCVA) in all of the patients recovered to or better than the preoperative best spectacled-corrected visual acuity (BSCVA). High order aberrations (HOA) increased at 1 week and then decreased slowly at 1 month and 3 months postoperatively. But the statistical difference was still significant at 3 months (P<0.05). The postoperative CS and GCS of every space frequency decreased after WAGCA. The difference between the preoperative and 1 week after operation was significant (P <0.05). At 3 months postoperatively, the low space frequency recovered nearly to preoperative level, but the difference of the medium and high space frequency was still statistically significant (P <0.05). Conclusions WAGCA is effective on correcting high myopia and some patients can gain super visual acuity, but the HOA increases and the CS and GCS decrease after WAGCA. The wave-front aberration, CS and GCS measurements combined with usual examination can more effec
tively evaluate the changes of visual function after WAGCA. 相似文献