全文获取类型
收费全文 | 11223篇 |
免费 | 634篇 |
国内免费 | 49篇 |
专业分类
耳鼻咽喉 | 159篇 |
儿科学 | 329篇 |
妇产科学 | 207篇 |
基础医学 | 1636篇 |
口腔科学 | 277篇 |
临床医学 | 965篇 |
内科学 | 2534篇 |
皮肤病学 | 192篇 |
神经病学 | 1011篇 |
特种医学 | 420篇 |
外国民族医学 | 3篇 |
外科学 | 1681篇 |
综合类 | 91篇 |
一般理论 | 1篇 |
预防医学 | 838篇 |
眼科学 | 158篇 |
药学 | 801篇 |
中国医学 | 16篇 |
肿瘤学 | 587篇 |
出版年
2023年 | 88篇 |
2022年 | 238篇 |
2021年 | 382篇 |
2020年 | 178篇 |
2019年 | 236篇 |
2018年 | 299篇 |
2017年 | 250篇 |
2016年 | 230篇 |
2015年 | 263篇 |
2014年 | 336篇 |
2013年 | 457篇 |
2012年 | 601篇 |
2011年 | 647篇 |
2010年 | 343篇 |
2009年 | 308篇 |
2008年 | 463篇 |
2007年 | 593篇 |
2006年 | 527篇 |
2005年 | 493篇 |
2004年 | 456篇 |
2003年 | 410篇 |
2002年 | 378篇 |
2001年 | 296篇 |
2000年 | 256篇 |
1999年 | 245篇 |
1998年 | 99篇 |
1997年 | 107篇 |
1996年 | 78篇 |
1995年 | 64篇 |
1993年 | 48篇 |
1992年 | 136篇 |
1991年 | 126篇 |
1990年 | 144篇 |
1989年 | 151篇 |
1988年 | 122篇 |
1987年 | 132篇 |
1986年 | 125篇 |
1985年 | 134篇 |
1984年 | 112篇 |
1983年 | 90篇 |
1980年 | 54篇 |
1979年 | 94篇 |
1978年 | 63篇 |
1977年 | 53篇 |
1975年 | 49篇 |
1974年 | 63篇 |
1973年 | 51篇 |
1972年 | 64篇 |
1970年 | 48篇 |
1966年 | 45篇 |
排序方式: 共有10000条查询结果,搜索用时 13 毫秒
81.
Andrzej Lorek Katarzyna Steinhof-Radwaska Wojciech Zarbski Joanna Lorek Zoran Stoj
ev Jacek Zych Aleksandra Syrkiewicz Pawe Niemiec Karol Szyluk 《Current oncology (Toronto, Ont.)》2022,29(5):2887
(1) Background: The purpose of the study was a retrospective, comparative assessment of complications of the surgical sentinel node biopsy (SNB) procedure in breast cancer using the radiotracer method and the SentiMag® method on groups of patients after 3.5 years of use. (2) Methods: The material was a group of 345 patients with primary surgical breast cancer who underwent the SNB procedure with the use of a radiotracer in combination with wide local excision (WLE), simple amputation (SA) with SNB and an independent SNB procedure in the period from May 2018 to January 2021 in the Department of Oncological Surgery. Of the patients who were monitored in the Hospital Outpatient Clinic, 300 were enrolled. The analyzed group was compared in terms of the occurrence of the same complications with the group of 303 patients also operated on in our center in the period from January 2014 to September 2017, in which SN identification was performed using the SentiMag® method. (3) Results: The most common complications found were sensation disorders in the arm, which occurred in 16 (14.1%) patients using the radiotracer method, SentiMag®-11 (9.9%). By comparing the complication rate between the methods with the radiotracer (n = 300) and SentiMag® (n = 303), no significant differences were found. (4) Conclusions: Sentinel node (SN) identification using the radiotracer method and the SentiMag® method are comparable diagnostic methods in breast cancer, with a low risk of complications. 相似文献
82.
F A Manning I Morrison I R Lange C R Harman P F Chamberlain 《American journal of obstetrics and gynecology》1987,156(3):709-712
The fetal biophysical profile score was modified by selective use of the nonstress test. In 2712 study patients (7851 tests) the incidence of nonstress test was reduced to 2.7% with no measurable effect or test accuracy. The nonstress test was most useful in evaluation of abnormal ultrasound monitored variables. 相似文献
83.
The aim of this article is to explore the reasons for seeking selected information on a food label, with particular emphasis on certain information about sugar. In order to meet the aim, in 2020, a survey was conducted among consumers aged 18–45. Predictive models (Logistic Regression) were developed for noticing “light” products and reading food labels. The results of our study indicate that consumers are mainly discouraged from reading label information by a large amount of information, the lack of time, and a general reluctance to be interested in label information. When it comes to the factors that lead people to read label information, the naturalness of the product, its organic origin, and physical activity are important. Moreover, respondents who declared that they noticed products on the market defined as “light” were those who were interested in the naturalness of the product, but also consumers declaring that they have nutritional knowledge. The results of the study indicate the need to intensify information campaigns in order to emphasize how important it is for consumers to read the information on food labels. The amount and complexity of information currently appearing on the food label may unfortunately discourage consumers from reading it, so it is important to continuously improve this form of communication with the consumer. 相似文献
84.
Paulina Wejner-Mik Aleksandra Teneta Mateusz Jankowski Ludmia Czyszpak Katarzyna Wdowiak-Okrojek Ewa Szymczyk Jarosaw D. Kasprzak Piotr Lipiec 《Archives of Medical Science》2022,18(4):998
IntroductionRecently introduced microUSB ultrasound probe, which can be connected to personal mobile device constitutes a new class of diagnostic pocket size imaging devices (PSID).The aim of this study was to assess the feasibility and clinical utility of real-time tele-echocardiography with the use such device.Material and methodsThe study group comprised 30 patients (18 men and 12 women; mean age: 54 ±14 years; mean body mass index: 27 ±6 kg/m2), admitted to various hospital departments (infectious diseases, internal medicine and cardiology). All patients underwent focused echocardiographic examination performed by an inexperienced operator using PSID and collaborating remotely in real-time with cardiologist by means of tele-consultation. Before commencing the examination, the operators underwent 1 h training in use of the PSID.ResultsIn most of patients PSID imaging provided sufficient diagnostic image quality. The dimensions of left ventricle, left atrium and the aorta obtained during the this examination showed good correlation with standard echocardiography (r = 0.89, r = 0.82, r = 0.92 respectively), but the correlation for TAPSE measurements was less pronounced (r = 0.52). The agreement in detection of pathologies (wall motion abnormalities, morphological and functional valvular abnormalities) between the tele-echocardiography and standard echocardiographic examination was good to very good (κ ranged from 0.648 to 0.823).ConclusionsPocket size imaging devices allows an inexperienced operator to perform a focused echocardiographic examination under a remote supervision of an experienced cardiologist. The introduction of new technology in the form of PSID with tele-echocardiography feature can revolutionize access to this imaging technique. 相似文献
85.
Ana Milojevi Marija Zdravkovi Milica Brajkovi Lidija Memon Vera Gardijan Jelena Veki Aleksandra Zeljkovi Aleksandra Stefanovi Marija Mihajlovi Jasmina Ivanievi Nataa Bogavac-Stanojevi Vojislav Radosavljevi Vesna Spasojevi-Kalimanovska Ana Nini 《Medical principles and practice》2022,31(3):293
ObjectivesObstructive sleep apnea (OSA) is a common condition closely related to obesity, insulin resistance, dyslipidemia, and cardiovascular disease. The aim of this study was to explore the possible relationship between OSA and proprotein convertase subtilisin/kexin type 9 (PCSK9).MethodsFull-night polysomnography was performed on 150 participants who were divided into three groups: controls, OSA patients on statin therapy, and OSA patients not on statin therapy. Biochemical markers, plasma low-density lipoprotein (LDL) and high-density lipoprotein (HDL) subclasses, and PCSK9 were determined.ResultsPCSK9 was highest in OSA patients on statins compared to the control group and to OSA patients not on statins (p = 0.036 and p = 0.039, respectively), after adjustment for body mass index (BMI). LDL diameter was greater in OSA patients not on statins compared to OSA patients on statins (p = 0.032). PCSK9 was highest in the group of patients with all three risk factors (diagnosed OSA, statins, BMI ≥25 kg/m<sup>2</sup>) compared to groups with no, one, and two risk factors (p = 0.031, p = 0.001, and p = 0.029, respectively). Presence of OSA, statin therapy, and BMI ≥25 kg/m<sup>2</sup> when combined were independently associated with higher levels of PCSK9 when adjusted for antihypertensive therapy, small dense LDL, and HDL 3c subclass (odds ratio = 2.849; interquartile range [1.026–7.912], p = 0.044).ConclusionStatin therapy was closely related to PCSK9. OSA along with obesity and statin use induces elevation of PCSK9. 相似文献
86.
Katarzyna Romejko Aleksandra Rymarz Katarzyna Szamotulska Zbigniew Bartoszewicz Stanisaw Niemczyk 《Nutrients》2022,14(14)
Background: Osteoprotegerin (OPG) is a molecule which belongs to the tumor necrosis factor receptor superfamily. OPG concentration is elevated in patients with left ventricle hypertrophy, heart failure and acute myocardial infarction. OPG concentrations rise in chronic kidney disease (CKD). The aim of this study was to investigate the association between OPG concentrations and cardiovascular complications, such as left ventricle hypertrophy, systolic and diastolic dysfunction of left ventricle and dysfunction of right ventricle in chronic kidney disease patients not treated with dialysis. The relation between OPG and the amount of pericardial fluid was also examined. Methods: One hundred and one men with CKD stage 3–5 not treated with dialysis were included in the study. Overhydration, body fat mass and lean body mass were measured using bioimpedance spectroscopy (BIS). Echocardiography was performed to evaluate the amount of pericardial fluid and to measure the thickness of the interventricular septum (IVS), systolic and diastolic function of left ventricle, as well as systolic function of right ventricle. Results: We observed a significant positive association between OPG and the thickness of the interventricular septum, the size of the left atrium (LA) and the presence of pericardial fluid. A negative relationship was observed between OPG and ejection fraction (EF). Conclusions: Our results suggest that OPG can be an independent marker of left ventricular hypertrophy, systolic and diastolic dysfunction of left ventricle and the presence of pericardial fluid in chronic kidney disease patients. 相似文献
87.
OBJECTIVES: Impairments of immune system play an important role in the development and pathogenesis of endometriosis. In affected women peritoneal macrophages are excessively activated, which is visible in an increased synthesis and release of macrophage-derived cytokines and growth factors. Monocytes are precursors of those cells in peripheral blood. The aim of the study was to evaluate the activity of monocyte from a healthy person, after stimulation by serum of women with endometriosis in cell culture conditions. The indicator of monocyte activity was the concentration of neopterin (NPT), produced by those cells. MATERIAL AND METHODS: Twenty nine women with endometriosis (mean age: 28.7+/-4.5 years) were included into this study. Among them were 18 women with moderate endometriosis (I and II stages according to AFS) and 11 women with advanced stages of the disease (III and IV stages according to AFS). Reference group consisted of fifteen healthy women (mean age: 27.4+/-5.3 years), with excluded endometriosis and other pathological disorders within the pelvis. Monocytes used in the study were isolated from peripheral blood of a healthy male and serum of women with endometriosis and control group. Monocytes were cultured in attendance of 15% and 30% serum of studied women. The concentration of NPT in the supernatants of culture was measured by enzyme-linked immunosorbent ELISA assay. RESULTS: The serum of women with endometriosis causes an increased concentration of NPT in supernatants, when comparing with serum of healthy women (p<0. 0001). The highest concentration was observed after stimulation by serum of women with advanced endometriosis. CONCLUSIONS: Serum of women with endometriosis can have an effect on monocyte activity, which is displayed in the increased synthesis and secreted of NPT. 相似文献
88.
Lehnartz Werner Schultz Schlomka Lange Bahrlow 《Journal of molecular medicine (Berlin, Germany)》1940,19(2):42-43
Ohne Zusammenfassung 相似文献
89.
Georg Lange Strobel Sponholz Werthemann Spaar Max Budde 《Journal of cancer research and clinical oncology》1939,49(4):167-171
Ohne Zusammenfassung 相似文献
90.
Huebschmann Rudy H. Glatzel Grafe A. Loeser Lange L. Lendle Gruhle 《Journal of molecular medicine (Berlin, Germany)》1938,17(28):984-985
Ohne Zusammenfassung 相似文献