全文获取类型
收费全文 | 10833篇 |
免费 | 1037篇 |
国内免费 | 520篇 |
专业分类
耳鼻咽喉 | 50篇 |
儿科学 | 102篇 |
妇产科学 | 149篇 |
基础医学 | 1470篇 |
口腔科学 | 515篇 |
临床医学 | 1142篇 |
内科学 | 1208篇 |
皮肤病学 | 119篇 |
神经病学 | 463篇 |
特种医学 | 387篇 |
外国民族医学 | 17篇 |
外科学 | 943篇 |
综合类 | 2087篇 |
预防医学 | 376篇 |
眼科学 | 86篇 |
药学 | 984篇 |
2篇 | |
中国医学 | 647篇 |
肿瘤学 | 1643篇 |
出版年
2024年 | 10篇 |
2023年 | 124篇 |
2022年 | 161篇 |
2021年 | 314篇 |
2020年 | 359篇 |
2019年 | 335篇 |
2018年 | 278篇 |
2017年 | 326篇 |
2016年 | 345篇 |
2015年 | 333篇 |
2014年 | 540篇 |
2013年 | 632篇 |
2012年 | 618篇 |
2011年 | 755篇 |
2010年 | 644篇 |
2009年 | 567篇 |
2008年 | 615篇 |
2007年 | 628篇 |
2006年 | 596篇 |
2005年 | 550篇 |
2004年 | 436篇 |
2003年 | 401篇 |
2002年 | 372篇 |
2001年 | 320篇 |
2000年 | 279篇 |
1999年 | 217篇 |
1998年 | 196篇 |
1997年 | 186篇 |
1996年 | 159篇 |
1995年 | 140篇 |
1994年 | 153篇 |
1993年 | 103篇 |
1992年 | 91篇 |
1991年 | 87篇 |
1990年 | 67篇 |
1989年 | 58篇 |
1988年 | 74篇 |
1987年 | 46篇 |
1986年 | 39篇 |
1985年 | 62篇 |
1984年 | 29篇 |
1983年 | 23篇 |
1982年 | 24篇 |
1981年 | 27篇 |
1980年 | 25篇 |
1979年 | 20篇 |
1978年 | 6篇 |
1977年 | 6篇 |
1976年 | 6篇 |
1974年 | 3篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
2.
3.
《Journal of emergency nursing》2022,48(4):484-491
BackgroundCalcium chloride is commonly used in emergency departments in the treatment of a variety of emergencies. Historically, administration via central venous catheters has been preferred owing to its high osmolarity and vesicant properties. Although preferred, central access may not always be available in time-sensitive, emergent situations leading to many instances of peripheral administration. The objective of this analysis was to evaluate the charted safety of peripheral venous administration of 10% calcium chloride.MethodsA single-center retrospective chart review was performed in patients who received 10% calcium chloride in the adult emergency department evaluating for the incidence of infusion-related adverse events. Patients were excluded if they were less than 18 years of age or had a lack of catheter documentation during 10% calcium chloride administration or if the 10% calcium chloride was documented as given through a central venous catheter.ResultsA total of 72 administrations were evaluated. Patients were predominantly male (67%), with a median age of 55 years and body mass index of 29.2. The primary outcome demonstrated that 4 infusion-related adverse events occurred (6%) with grade 1 (n = 1) and grade 0 (n = 3) documented incidence of infusion-related adverse events. None of the documented incidence of infusion-related adverse events resulted in permanent tissue injury, and all patients had conservative management.DiscussionThis study demonstrated that administration of 10% calcium chloride via peripheral venous catheters may be feasible and seemed to carry a low incidence of documented complications. Further prospective studies are needed to confirm study observations. 相似文献
4.
目的:研究Piezo1机械敏感性离子通道对骨细胞的调控作用。方法:应用课题组研发的流体剪切力(FSS)加载装置,使用免疫荧光探究FSS对Piezo1通道在MLO-Y4中影响的最佳强度;对Piezo1使用FSS、激动剂Yoda1或阻滞剂GsMTx4进行干预。使用Western Blot探究Cleaved Caspase-3、Bcl-2、Bax凋亡相关蛋白的表达量;使用Hoechst-33258以及流式细胞凋亡检测MLO-Y4骨细胞的凋亡比例。结果:免疫荧光染色结果表明FSS对MLO-Y4骨细胞中Piezo1的表达呈现先增加后降低的单峰趋势,其中以9 dyne/cm2加载30 min为最佳刺激条件。使用Yoda1抑制MLO-Y4细胞凋亡(P<0.05),使用GsMTx4促进MLO-Y4细胞凋亡(P<0.05)。Piezo1介导的FSS抑制MLO-Y4细胞凋亡(P<0.05)。结论:Piezo1机械敏感性离子通道介导的FSS在9 dyne/cm2条件下抑制MLO-Y4骨细胞凋亡,且FSS在该条件下可以有效逆转Piezo1阻滞剂GsMTx4在4 μmol/L作用0.5 h下促进MLO-Y4细胞凋亡作用。 相似文献
5.
《Ultrasound in medicine & biology》2022,48(8):1663-1671
Mass characteristic frequency (fmass) is a novel shear wave (SW) parameter that represents the ratio of the averaged minimum SW speed within the regions of interest to the largest dimension of the mass. Our study objective was to evaluate if the addition of fmass to conventional 2-D shear wave elastography (SWE) parameters would improve the differentiation of benign from malignant thyroid nodules. Our cohort comprised 107 patients with 113 thyroid nodules, of which 67 (59%) were malignant. Two-dimensional SWE data were obtained using the Supersonic Imagine Aixplorer ultrasound system equipped with a 44- to 15-MHz15-MHz linear array transducer. A receiver operating characteristic curve was generated based on a multivariable logistic regression analysis to evaluate the ability of SWE parameters with/without fmass and with/without clinical factors to discriminate benign from malignant thyroid nodules. The addition of fmass to conventional SW elasticity parameters increased the area under the curve from 0.808 to 0.871 (p = 0.02). The combination of SW elasticity parameters plus fmass plus clinical factors provided the strongest thyroid nodule malignancy probability estimate, with a sensitivity of 93.4% and specificity of 91.1% at the optimal threshold. In summary, fmass can be a valuable addition to conventional 2-D SWE parameters. 相似文献
6.
《Value in health》2022,25(12):1977-1985
ObjectivesEstimates on the distribution of patients with multiple myeloma (MM) by line of therapy (LOT) are scarce and get outdated quickly as new treatments become available. The objective of this study was to estimate the number of patients with MM by LOT and the number of patients who have received at least 4 previous LOTs including proteasome inhibitors, immunomodulatory agents, and anti-CD38 monoclonal antibodies (mAbs).MethodsA compartmental model was developed to calculate the number of patients by LOT. Two pathways were considered based on stem cell transplant eligibility, and at each pathway, treatments were stratified in 2 types: anti-CD38 mAbs or other. The model population was stratified into 4 subgroups based on age and cytogenetic risk. Model inputs were informed from real-world evidence.ResultsThe model estimated that, in 2020, 126 869 patients were living with MM in the United States. Of these, 105 701 received treatment in any LOT, with 56 959, 27 252, 11 258, and 5217 in lines 1 to 4, respectively, and 5015 in line 5 or beyond. The model estimated that 3497 patients received at least 4 previous LOTs including proteasome inhibitors, immunomodulatory agents, and anti-CD38 mAbs. The model overall prevalence predictions aligned well with publicly available estimates.ConclusionsThis study proposes a novel framework to estimate MM prevalence. It can assist clinicians to understand future trends in MM epidemiology, healthcare systems to plan for future resource use allocation, and payers to quantify the budget impact of new treatments. 相似文献
7.
《Journal of vascular and interventional radiology : JVIR》2022,33(6):631-638
PurposeTo test the following hypotheses: (a) balloon or stent assistance increases coil packing density (CPD) in the endovascular treatment of intracranial aneurysms, and (b) CPD correlates to ostium area (OA) and aneurysm volume (AV).Materials and MethodsThis retrospective study included 60 aneurysms (54 ruptured and 6 unruptured) treated with simple coiling (SC) (n = 18), balloon-assisted coiling (BAC) (n = 7), or stent-assisted coiling (SAC) (n = 35) at the authors’ institution between August 2017 and December 2019. AV and OA measurements were obtained from 3-dimensional digital subtraction angiography images using commercial software. Coil sizes were retrieved from patient files, and coil volume (CV) measurements were obtained from https://www.angiocalc.com/. Analysis of covariance, multivariate covariance analysis, and Pearson correlation analyses were performed.ResultsThe median value for AV, CV, CPD, and OA was 63.4 mm3 (range, 5.5–1,771.4 mm3), 23.13 mm3 (range, 2.03–296.95 mm3), 33.29% (range, 13.41%–81.02%), and 10.7 mm2 (range, 2.7–49.9 mm2), respectively. Multivariate analysis showed that the CPD values were not significantly different among the treatment groups, although OA significantly differed between the SC and SAC groups (P < .05). Pearson correlations showed that similar to AV, OA was negatively correlated with CPD (r = ?0.321, P < .05).ConclusionsThe CPD value in cerebral aneurysms treated with BAC or SAC did not differ from that in aneurysms treated with SC. 相似文献
8.
9.
管壁切应力(WSS)属于血流动力学因素,在冠状动脉粥样硬化的演变过程发挥着重要作用。综述WSS的基本概念及在冠状动脉粥样硬化斑块发生发展中的作用,并重点探究基于血管内成像技术、冠状动脉CT血管成像等影像学技术的WSS研究现状,以及相关血流动力学模型在预测斑块进展、破裂并评估血流动力学风险中的价值,以提高识别责任斑块的效能,为临床进一步诊疗提供重要帮助。 相似文献
10.
目的 研究CD200R1对细菌脂多糖(lipopolysaccharide,LPS)诱导的小胶质细胞内吞功能的影响。方法 应用LPS激活小胶质细胞并通过荧光微球内吞实验观察小胶质细胞内吞水平的变化以及通过RT-qPCR检测CD200R1mRNA水平的表达,并在BV2-SH-SY5Y共培养模型中同样通过荧光微球内吞实验观察LPS诱导的小胶质细胞内吞功能的变化,最后利用CD200R1基因敲除小鼠提取原代培养的小胶质细胞并加LPS处理,通过荧光微球内吞实验观察其内吞功能的变化。结果 LPS激活小胶质细胞,促进了小胶质细胞内吞水平增加以及CD200R1表达下降。在BV2-SH-SY5Y共培养模型中,神经元细胞接触小胶质细胞后抑制LPS诱导的小胶质细胞内吞增加,CD200R1基因敲除的小胶质细胞加入LPS处理后,内吞水平增加更明显。结论 CD200R1基因敲除的小胶质细胞在LPS刺激后内吞水平增加更明显。 相似文献