全文获取类型
收费全文 | 6164篇 |
免费 | 460篇 |
国内免费 | 26篇 |
专业分类
耳鼻咽喉 | 55篇 |
儿科学 | 248篇 |
妇产科学 | 173篇 |
基础医学 | 1095篇 |
口腔科学 | 181篇 |
临床医学 | 573篇 |
内科学 | 1277篇 |
皮肤病学 | 122篇 |
神经病学 | 605篇 |
特种医学 | 116篇 |
外科学 | 465篇 |
综合类 | 33篇 |
一般理论 | 9篇 |
预防医学 | 641篇 |
眼科学 | 118篇 |
药学 | 435篇 |
中国医学 | 15篇 |
肿瘤学 | 489篇 |
出版年
2023年 | 80篇 |
2022年 | 58篇 |
2021年 | 255篇 |
2020年 | 159篇 |
2019年 | 248篇 |
2018年 | 262篇 |
2017年 | 166篇 |
2016年 | 196篇 |
2015年 | 263篇 |
2014年 | 287篇 |
2013年 | 356篇 |
2012年 | 590篇 |
2011年 | 543篇 |
2010年 | 314篇 |
2009年 | 226篇 |
2008年 | 441篇 |
2007年 | 349篇 |
2006年 | 377篇 |
2005年 | 357篇 |
2004年 | 282篇 |
2003年 | 269篇 |
2002年 | 202篇 |
2001年 | 29篇 |
2000年 | 17篇 |
1999年 | 22篇 |
1998年 | 31篇 |
1997年 | 13篇 |
1996年 | 25篇 |
1995年 | 19篇 |
1994年 | 14篇 |
1993年 | 13篇 |
1992年 | 6篇 |
1991年 | 9篇 |
1988年 | 5篇 |
1987年 | 7篇 |
1984年 | 11篇 |
1983年 | 5篇 |
1982年 | 10篇 |
1981年 | 7篇 |
1980年 | 9篇 |
1978年 | 8篇 |
1977年 | 6篇 |
1976年 | 7篇 |
1975年 | 5篇 |
1973年 | 7篇 |
1961年 | 5篇 |
1958年 | 4篇 |
1932年 | 4篇 |
1931年 | 4篇 |
1925年 | 4篇 |
排序方式: 共有6650条查询结果,搜索用时 15 毫秒
1.
2.
Maria Carolyna Fonseca Batista Arbex Jane Erika Frazão Okazaki Daniela Regina Brandão Tavares Ana Laura Figueiredo Bersani Fania Cristina Santos 《Journal of orthopaedic science》2021,26(1):162-166
BackgroundIn 2007, the Japanese Orthopedic Association established the term “Locomotive Syndrome” (LS) for the concept of locomotor organ dysfunction with potential loss of independence. The purpose of this study was to identify characteristics of LS and establish a diagnostic cut-off for the Geriatric Locomotive Function Scale (GLFS 25-p) for the Brazilian population.MethodsA cross-sectional observational study of the LOCOMOV Project cohort of independent outpatients aged ≥80 years was conducted. Questionnaires on functional status in Basic and Instrumental Activities of Daily Living (Katz and Lawton, respectively) and quality of life (WHOQOL-Bref) were applied, together with the Geriatric Locomotive Function Scale (GLFS 25-p) to identify individuals with LS. Mobility was assessed using the five-times sit-to-stand test, 4-m gait speed, two-step test, one-leg standing time with eyes open and hand-grip test. The data were analyzed using Student's t-test, the Chi–Square test, and multiple logistic regression (stepwise). The significance level was set at 0.05 (5%).ResultsA sample of 102 individuals with mean age of 87.3 (±4.2) years and predominantly female (73.5%) was assessed. We determined a cut-off score of 19 (sensitivity of 0.86 and specificity of 0.67) for diagnosis of LS, as assessed by the GLFS 25-p, and a high prevalence (55%) of the syndrome was found in the sample. In the multiple regression analysis, LS was directly associated with chronic pain (OR 22.24, 95%CI 3.13–157.87), use of a walking device (OR 17.121, 95%CI 1.94–150.49), and inversely associated with gait speed ≥0.8 m/s (OR 0.42, 95%CI 0.006–0.278), perception of good health (OR 0.153, 95%CI 0.029–0.799) and male gender (OR 0.086, 95%CI 0.0105–0.714).ConclusionThe LS in the oldest old proved a very common condition in this survey, especially in women, and was strongly associated with chronic pain, worse performance on physical tests and poor quality of life. 相似文献
3.
4.
5.
Cheryl L. Rock PhD RD Cynthia A. Thomson PhD RD Kristen R. Sullivan MS MPH Carol L. Howe MD MLS Lawrence H. Kushi ScD Bette J. Caan DrPH Marian L. Neuhouser PhD RD Elisa V. Bandera MD PhD Ying Wang PhD Kimberly Robien PhD RD Karen M. Basen-Engquist PhD MPH Justin C. Brown PhD Kerry S. Courneya PhD Tracy E. Crane PhD RDN David O. Garcia PhD FACSM Barbara L. Grant MS RDN CSO FAND Kathryn K. Hamilton MA RDN CSO CDN FAND Sheri J. Hartman PhD Stacey A. Kenfield ScD Maria Elena Martinez PhD Jeffrey A. Meyerhardt MD MPH Larissa Nekhlyudov MD MPH Linda Overholser MD Alpa V. Patel PhD Bernardine M. Pinto PhD Mary E. Platek PhD RD CDN Erika Rees-Punia PhD MPH Colleen K. Spees PhD MEd RD LD FAND Susan M. Gapstur PhD Marjorie L. McCullough ScD RD 《CA: a cancer journal for clinicians》2022,72(3):230-262
The overall 5-year relative survival rate for all cancers combined is now 68%, and there are over 16.9 million survivors in the United States. Evidence from laboratory and observational studies suggests that factors such as diet, physical activity, and obesity may affect risk for recurrence and overall survival after a cancer diagnosis. The purpose of this American Cancer Society guideline is to provide evidence-based, cancer-specific recommendations for anthropometric parameters, physical activity, diet, and alcohol intake for reducing recurrence and cancer-specific and overall mortality. The audiences for this guideline are health care providers caring for cancer survivors as well as cancer survivors and their families. The guideline is intended to serve as a resource for informing American Cancer Society programs, health policy, and the media. Sources of evidence that form the basis of this guideline are systematic literature reviews, meta-analyses, pooled analyses of cohort studies, and large randomized clinical trials published since 2012. Recommendations for nutrition and physical activity during cancer treatment, informed by current practice, large cancer care organizations, and reviews of other expert bodies, are also presented. To provide additional context for the guidelines, the authors also include information on the relationship between health-related behaviors and comorbidities, long-term sequelae and patient-reported outcomes, and health disparities, with attention to enabling survivors' ability to adhere to recommendations. Approaches to meet survivors' needs are addressed as well as clinical care coordination and resources for nutrition and physical activity counseling after a cancer diagnosis. 相似文献
6.
Erika Cecon Anna Ivanova Marine Luka Florence Gbahou Anne Friederich Jean‐Luc Guillaume Patrick Keller Klaus Knoch Raise Ahmad Philippe Delagrange Michele Solimena Ralf Jockers 《Journal of pineal research》2019,66(2)
Melatonin receptors play important roles in the regulation of circadian and seasonal rhythms, sleep, retinal functions, the immune system, depression, and type 2 diabetes development. Melatonin receptors are approved drug targets for insomnia, non‐24‐hour sleep‐wake disorders, and major depressive disorders. In mammals, two melatonin receptors (MTRs) exist, MT1 and MT2, belonging to the G protein‐coupled receptor (GPCR) superfamily. Similar to most other GPCRs, reliable antibodies recognizing melatonin receptors proved to be difficult to obtain. Here, we describe the development of the first monoclonal antibodies (mABs) for mouse MT1 and MT2. Purified antibodies were extensively characterized for specific reactivity with mouse, rat, and human MT1 and MT2 by Western blot, immunoprecipitation, immunofluorescence, and proximity ligation assay. Several mABs were specific for either mouse MT1 or MT2. None of the mABs cross‐reacted with rat MTRs, and some were able to react with human MTRs. The specificity of the selected mABs was validated by immunofluorescence microscopy in three established locations (retina, suprachiasmatic nuclei, pituitary gland) for MTR expression in mice using MTR‐KO mice as control. MT2 expression was not detected in mouse insulinoma MIN6 cells or pancreatic beta‐cells. Collectively, we report the first monoclonal antibodies recognizing recombinant and native mouse melatonin receptors that will be valuable tools for future studies. 相似文献
7.
Valentina Becherucci Stefano Ermini Luisa Piccini Silvia Bisin Valentina Gori Francesca Gentile Riccardo Ceccantini Elena De Rienzo Barbara Bindi Paola Pavan Vanessa Cunial Elisa Allegro Francesca Brugnolo Daniela Maggio Daniela Calzolari Erika Maccarelli Silvia Galli Sonia Muricci Marco Berchielli Veronica Tintori Iacopo Sardi Franco Bambi 《Journal of clinical apheresis》2020,35(5):406-412
8.
Erika Borlenghi Chiara Cattaneo Elisa Cerqui Silvana Archetti Diego Bertoli Daniela Bellotti Doriana Gramegna Giulia Soverini Margherita Oberti Francesca Schieppati Chiara Pagani Angela Passi Margherita Sciumé Mirko Farina Cecilia Carbone Claudia Crippa Daniela Dalceggio Alessandra Tucci Giuseppe Rossi 《Hematological oncology》2020,38(5):754-762
Consolidation treatment in acute myeloid leukemia (AML) patients achieving complete remission (CR) is warranted. High-dose cytarabine (HDAC) is considered first choice in favorable risk and an option in intermediate-risk AML. However, its optimal dose and schedule, as well as the benefit of additional chemotherapy agents remain controversial. Herein, we report on the long-term outcome of consecutive unselected AML patients treated with repeated courses of HDAC, with the addition of idarubicin, followed by autologous peripheral blood stem cell (PBSC) support, in order to limit toxicity, according to Northern Italy Leukemia Group (NILG) AML-01/00 study (EUDRACT number 00400673). Among 338 patients consecutively diagnosed from 2001 to 2017 at our center, 148 with high-risk AML (adverse cytogenetic, isolated FLT3-internal tandem duplication mutation, refractory to first induction) were addressed to allogeneic stem cell transplant. All other cases, 186 patients (55%), median age 53 (range 19–75), were considered standard-risk and received the NILG AML-01/00 program. After achieving CR, patients were mobilized with cytarabine 8 g/sqm to collect autologous CD34+-PBSC and received three consolidation cycles with HDAC (20 g/sqm) plus idarubicin (20 mg/sqm) per cycle, followed by reinfusion of limited doses of CD34+ PBSC (1-2x106/kg). The program was completed by 160 (86%) patients. Toxicity was acceptable. Neutrophils recovered a median of 10 days. Treatment-related mortality was 3/160 (1.8%). After a median follow-up of 66.4 months, overall survival (OS) and relapse-free survival (RFS) at 5-years were 61.4% and 52.4%, respectively. Twenty-eight selected patients aged >65 had similar outcomes. According to European leukemia net-2010 classification, the OS and RFS at 5-years were 76.4% and 65% in favorable risk, without differences between molecular subgroups, 52.3% and 47.2% in Intermediate-I, 45.2% and 36.5% in Intermediate-II risk patients, respectively. In conclusion, consolidation including repeated courses of high dose cytarabine and idarubicin, with limited PBSC support, proved feasible and very effective in nonhigh risk patients. The incorporation of novel agents in its backbone may be tested to further improve patient's prognosis. 相似文献
9.
Carlos A. ávila-Orta Zoe V. Qui?ones-Jurado Miguel A. Waldo-Mendoza Erika A. Rivera-Paz Víctor J. Cruz-Delgado José M. Mata-Padilla Pablo González-Morones Ronald F. Ziolo 《Materials》2015,8(11):7900-7912
Isotactic polypropylenes (iPP) with different melt flow indexes (MFI) were used to fabricate nanocomposites (NCs) with 10 wt % loadings of multi-wall carbon nanotubes (MWCNTs) using ultrasound-assisted extrusion methods to determine their effect on the morphology, melt flow, and electrical properties of the NCs. Three different types of iPPs were used with MFIs of 2.5, 34 and 1200 g/10 min. Four different NC fabrication methods based on melt extrusion were used. In the first method melt extrusion fabrication without ultrasound assistance was used. In the second and third methods, an ultrasound probe attached to a hot chamber located at the exit of the die was used to subject the sample to fixed frequency and variable frequency, respectively. The fourth method is similar to the first method, with the difference being that the carbon nanotubes were treated in a fluidized air-bed with an ultrasound probe before being used in the fabrication of the NCs with no ultrasound assistance during extrusion. The samples were characterized by MFI, Optical microscopy (OM), Scanning electron microscopy (SEM), Transmission electron microscopy (TEM), electrical surface resistivity, and electric charge. MFI decreases in all cases with addition of MWCNTs with the largest decrease observed for samples with the highest MFI. The surface resistivity, which ranged from 1013 to 105 Ω/sq, and electric charge, were observed to depend on the ultrasound-assisted fabrication method as well as on the melt flow index of the iPP. A relationship between agglomerate size and area ratio with electric charge was found. Several trends in the overall data were identified and are discussed in terms of MFI and the different fabrication methods. 相似文献
10.