全文获取类型
收费全文 | 220篇 |
免费 | 19篇 |
国内免费 | 4篇 |
专业分类
耳鼻咽喉 | 1篇 |
儿科学 | 3篇 |
妇产科学 | 2篇 |
基础医学 | 25篇 |
口腔科学 | 5篇 |
临床医学 | 21篇 |
内科学 | 77篇 |
皮肤病学 | 1篇 |
神经病学 | 14篇 |
特种医学 | 6篇 |
外科学 | 34篇 |
综合类 | 5篇 |
一般理论 | 2篇 |
预防医学 | 18篇 |
眼科学 | 3篇 |
药学 | 19篇 |
肿瘤学 | 7篇 |
出版年
2023年 | 2篇 |
2022年 | 8篇 |
2021年 | 11篇 |
2020年 | 10篇 |
2019年 | 14篇 |
2018年 | 11篇 |
2017年 | 6篇 |
2016年 | 9篇 |
2015年 | 11篇 |
2014年 | 9篇 |
2013年 | 18篇 |
2012年 | 30篇 |
2011年 | 23篇 |
2010年 | 8篇 |
2009年 | 10篇 |
2008年 | 14篇 |
2007年 | 11篇 |
2006年 | 12篇 |
2005年 | 3篇 |
2004年 | 5篇 |
2003年 | 6篇 |
2002年 | 3篇 |
2001年 | 2篇 |
2000年 | 2篇 |
1995年 | 1篇 |
1991年 | 1篇 |
1989年 | 1篇 |
1969年 | 1篇 |
1960年 | 1篇 |
排序方式: 共有243条查询结果,搜索用时 30 毫秒
1.
目的:以鸭γ-干扰素(DuIFN-γ)基因为目的基因,研究同一启动子调控下,不同拷贝数的目的基因的表达状况。方法:采用基因重组技术构建含DuIFN-γcDNA单拷贝和双拷贝重组质粒并转入真核细胞COS-7中进行表达。DuIFN-γ活性采用Griess试剂检测。结果:双拷贝重组质粒和单拷贝重组质粒50%最大活性稀释度分别为1:320和1:160。双拷贝重组质粒转染上清稀释10240倍后,仍保留DuIFN-γ活性,而单拷贝重组质粒转染上清经1280倍稀释后,即丧失活性。结论:在同一启动子作用下,顺式插入双拷贝目的基因可明显增强目的基因在真核细胞中的表达量。 相似文献
2.
3.
Early and late diastolic strain rate vs global longitudinal strain at rest and during dobutamine stress for the assessment of significant coronary artery stenosis in patients with a moderate and high probability of coronary artery disease
下载免费PDF全文
![点击此处可从《Echocardiography (Mount Kisco, N.Y.)》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Egle Rumbinaite M.D. Diana Zaliaduonyte‐Peksiene M.D. Ph.D. Tomas Lapinskas M.D. Ruta Zvirblyte M.D. Arnas Karuzas Ieva Jonauskiene Mindaugas Viezelis M.D. Indre Ceponiene M.D. Olivija Gustiene M.D. Ph.D. Rimvydas Slapikas M.D. Ph.D. Jolanta Justina Vaskelyte M.D. Ph.D. 《Echocardiography (Mount Kisco, N.Y.)》2016,33(10):1512-1522
4.
Zinkevičienė Auksė Dumalakienė Irena Mieliauskaitė Diana Vilienė Rita Narkevičiūtė Ieva Girkontaitė Irutė 《Clinical rheumatology》2019,38(10):2803-2809
Clinical Rheumatology - Both Sjögren’s syndrome (SS) and non-autoimmune sicca syndrome (nSS) can show symptoms of dry eyes and a dry mouth, and objective reductions in tear and saliva... 相似文献
5.
6.
Francesca Ieva Anna Maria Paganoni Teresa Pietrabissa 《Health care management science》2017,20(3):353-364
We analyse data collected from the administrative datawarehouse of an Italian regional district (Lombardia) concerning patients affected by Chronic Heart Failure. The longitudinal data gathering for each patient hospital readmissions in time, as well as patient-specific covariates, is studied as a realization of non homogeneous Poisson process. Since the aim behind this study is to identify groups of patients behaving similarly in terms of disease progression and then healthcare consumption, we conjectured the time segments between two consecutive hospitalizations to be Weibull distributed in each hidden cluster. Adding a frailty term to take into account the within subjects unknown variability, the corresponding patient-specific hazard functions are reconstructed. Therefore, the comprehensive distribution for each time to event variable is modelled as a Weibull Mixture. We are then able to easily interpret the related hidden groups as healthy, sick, and terminally ill subjects. 相似文献
7.
8.
Francesco Santoro Armando Ferraretti Francesco Musaico Luigi Di Martino Nicola Tarantino Riccardo Ieva Matteo Di Biase Natale Daniele Brunetti 《Internal and emergency medicine》2016,11(5):687-694
The aim of this study is to evaluate the possible role of carbohydrate-antigen(CA)-125 as prognostic marker at short- and long-term follow-up, in subjects with Takotsubo cardiomyopathy (TTC). Sixty-three consecutive subjects with TTC were enrolled in the study and followed for a median 139 days. Circulating levels of CA-125, NT-proBNP, and left ventricular ejection fraction (LVEF) were evaluated at admission. Duration of hospital stay, incidence of death, re-hospitalization and recurrence of TTC during follow-up were recorded. The mean hospital stay was 8.3 days, adverse events occurred during follow up in 17 % of cases. CA-125 levels at admission are inversely related to LVEF (r ?0.30, p < 0.05) and directly related to hospital stay (r 0.29, p < 0.05). CA-125 levels at admission are higher in subjects with adverse events at follow-up (88.9 ± 200.0 vs 20.9 ± 30.0 U/mL, p < 0.05). Rates of incidence of adverse events are proportionally increased with CA-125 tertiles (0, 6, 11 % respectively, p for trend <0.01), at survival analysis (Log Rank p < 0.05) and after correction for age, gender, LVEF and NT-proBNP levels in multivariable Cox analysis (p < 0.05). CA-125 levels <10 U/ml are predictors of adverse events at follow up with 91 % sensitivity, 52 % specificity, 29 % positive predictive power, and 96 % negative predictive power. Increased CA-125 admission levels are associated with a longer hospital stay, a lower LVEF, and a higher risk of adverse events during follow up. CA-125 might be useful for early risk stratification of subjects with TTC. 相似文献
9.
Viola Bonomini Lucia Zucchelli Rebecca Re Francesca Ieva Lorenzo Spinelli Davide Contini Anna Paganoni Alessandro Torricelli 《Biomedical optics express》2015,6(2):615-630
We propose a new algorithm, based on a linear regression model, to statistically estimate the hemodynamic activations in fNIRS data sets. The main concern guiding the algorithm development was the minimization of assumptions and approximations made on the data set for the application of statistical tests. Further, we propose a K-means method to cluster fNIRS data (i.e. channels) as activated or not activated. The methods were validated both on simulated and in vivo fNIRS data. A time domain (TD) fNIRS technique was preferred because of its high performances in discriminating cortical activation and superficial physiological changes. However, the proposed method is also applicable to continuous wave or frequency domain fNIRS data sets.OCIS codes: (000.5490) Probability theory, stochastic processes, and statistics; (170.2655) Functional monitoring and imaging; (170.6920) Time-resolved imaging; (170.1470) Blood or tissue constituent monitoring 相似文献