全文获取类型
收费全文 | 16649篇 |
免费 | 893篇 |
国内免费 | 145篇 |
专业分类
耳鼻咽喉 | 120篇 |
儿科学 | 424篇 |
妇产科学 | 446篇 |
基础医学 | 1929篇 |
口腔科学 | 263篇 |
临床医学 | 1214篇 |
内科学 | 4269篇 |
皮肤病学 | 384篇 |
神经病学 | 1699篇 |
特种医学 | 551篇 |
外科学 | 2874篇 |
综合类 | 43篇 |
一般理论 | 1篇 |
预防医学 | 596篇 |
眼科学 | 210篇 |
药学 | 984篇 |
中国医学 | 36篇 |
肿瘤学 | 1644篇 |
出版年
2023年 | 124篇 |
2022年 | 131篇 |
2021年 | 464篇 |
2020年 | 274篇 |
2019年 | 361篇 |
2018年 | 433篇 |
2017年 | 319篇 |
2016年 | 427篇 |
2015年 | 476篇 |
2014年 | 609篇 |
2013年 | 820篇 |
2012年 | 1214篇 |
2011年 | 1153篇 |
2010年 | 763篇 |
2009年 | 623篇 |
2008年 | 1043篇 |
2007年 | 1077篇 |
2006年 | 999篇 |
2005年 | 971篇 |
2004年 | 922篇 |
2003年 | 748篇 |
2002年 | 703篇 |
2001年 | 284篇 |
2000年 | 296篇 |
1999年 | 231篇 |
1998年 | 155篇 |
1997年 | 124篇 |
1996年 | 132篇 |
1995年 | 105篇 |
1994年 | 106篇 |
1993年 | 77篇 |
1992年 | 165篇 |
1991年 | 155篇 |
1990年 | 133篇 |
1989年 | 110篇 |
1988年 | 102篇 |
1987年 | 97篇 |
1986年 | 81篇 |
1985年 | 76篇 |
1984年 | 99篇 |
1983年 | 65篇 |
1982年 | 40篇 |
1981年 | 37篇 |
1980年 | 34篇 |
1979年 | 47篇 |
1978年 | 36篇 |
1977年 | 21篇 |
1976年 | 30篇 |
1974年 | 20篇 |
1973年 | 19篇 |
排序方式: 共有10000条查询结果,搜索用时 23 毫秒
1.
2.
Vincenzo Levi Andrea Franzini Andrea Di Cristofori Giulio Bertani Mauro Pluderi 《The journal of spinal cord medicine》2020,43(5):714-718
Context: Treatment of primary spinal syringomyelia is still controversial. Among others, shunting syrinx fluid to the subarachnoid, peritoneal or pleural space has been utilized with varying success. Shunt obstruction, migration, and infection represent the most common complications of these procedures. Findings: The authors present the case of an 81-year-old woman who developed an unusual neurological deterioration resembling a subacute posttraumatic ascending myelopathy (SPAM) after the insertion of a syringosubarachnoid shunt for the treatment of slow-growing D10 syringomyelia. Conclusion/Clinical Relevance: To date, no cases of SPAM secondary to the insertion of a syringosubarachnoid shunt for the treatment of syringomyelia have been reported. The potential pathogenesis related to this phenomenon is discussed. 相似文献
3.
4.
5.
6.
Maria Russo Claudio Lucifora Francesco Pucciarelli Bruno Piccoli 《La Medicina del lavoro》2019,110(2):115
Background:Workplace hazards are a significant source of health impairment for workers and of financial losses for firms. EU directives on workers’ health and safety standards significantly contributed to reduce reported occupational injuries, yet the incidence and prevalence of work-related mental illness is still very high.Objectives:We investigated the association between work-related hazards and individuals’ perceived mental health. We reviewed the existing evidence on the channels through which task-related factors, adverse agents and psychosocial factors are expected to affect workers’ health, with specific regard to mental health.Methods:We used data from the fifth wave of the European Working Conditions Survey, covering over 40,000 face-to-face interviews with workers in 34 countries, which includes information on socio-demographic characteristics, firms and jobs attributes, employment status, as well as working conditions and health status. We carried out an empirical analysis with multivariate regression models in order to estimate the relationship between workers’ mental health problems and workplace risk factors.Results:21,020 interviews were used in the multivariate analysis. We found strong correlations between hazards and various indicators of mental health. Among hazardous agents, low temperatures (β=0.0287) and contact with infectious materials (β=0.0394) were positively associated with mental health outcomes. Among task/sequence-related factors, tiring or painful positions (β=0.0713), repetitive hand/arm movements (β=0.0255), working with VDUs (β=0.0301), repetitive tasks <10 min (β=0.0859) and working in evenings (β=0.00754) were positively associated with mental health. Various psychosocial risk factors related to both the content of the job (for example, frequent disruptive interruptions: β=0.219, working in free time: β=0.0759, poor work-life balance: β=0.228) as well as the job context (for example, bad employment prospects: β=0.177, low decisional autonomy: β=0.245, bad social relations: β=0.186, workplace violence: β=0.411) were positively associated with mental health. The main results of the decomposition show that an important contribution to workers’ overall mental distress at work is associated with psychosocial risk factors (up to 60% for depression/anxiety symptoms and sleep disorders), while the contribution of somatic factors is on average lower (up to 20% for overall fatigue).Conclusions:We argue that action is needed to improve workers’ mental well-being, and reduce the economic costs for both the national health system and employers. Regulations and traditional economic measures are unlikely to prove successful in providing adequate standards of primary and secondary preventive measures in the work place without an appropriate and reliable Risk Assessment Procedure.Key words: Work hazards, risk assessment, job content, mental health 相似文献
7.
8.
Rocco Spagnuolo Alessandro Corea Mariantonietta Blumetti Alessia Giovinazzo Massimiliano Serafino Caterina Pagliuso Raffaele Pagnotta Grazia Curto Cristina Cosco Vincenzo Cosco Rosellina Margherita Mancina Pietro Garieri Anna Papaleo Laura Grande Anna Barilaro Eugenio Garofalo Andrea Bruni Patrizia Doldo 《Journal of advanced nursing》2020,76(11):2993-3002
9.
Elisa Giani Andrea Enzo Scaramuzza Gian Vincenzo Zuccotti 《World journal of diabetes》2015,6(8):999-1004
Technologies for diabetes management, such as continuous subcutaneous insulin infusion (CSII) and continuous glucose monitoring (CGM) systems, have improved remarkably over the last decades. These developments are impacting the capacity to achieve recommended hemoglobin A1c levels and assisting in preventing the development and progression of micro- and macro vascular complications. While improvements in metabolic control and decreases in risk of severe and moderate hypoglycemia have been described with use of these technologies, large epidemiological international studies show that many patients are still unable to meet their glycemic goals, even when these technologies are used. This editorial will review the impact of technology on glycemic control, hypoglycemia and quality of life in children and youth with type 1 diabetes. Technologies reviewed include CSII, CGM systems and sensor-augmented insulin pumps. In addition, the usefulness of advanced functions such as bolus profiles, bolus calculators and threshold-suspend features will be also discussed. Moreover, the current editorial will explore the challenges of using these technologies. Indeed, despite the evidence currently available of the potential benefits of using advanced technologies in diabetes management, many patients still report barriers to using them. Finally this article will highlight the importance of future studies tailored toward overcome these barriers to optimizing glycemic control and avoiding severe hypoglycemia. 相似文献
10.
Maria Ricci Agostino Chiaravalloti Alessandro Martorana Giacomo Koch Vincenzo De lucia Gaetano Barbagallo Orazio Schillaci 《Annals of nuclear medicine》2020,34(4):254-262
The aim of our study was to investigate the impact of the epsilon phenotype in brain glucose consumption in a population with Alzheimer’s disease. Statistical Parametric Mapping (SPM8) was used to investigate differences in brain glucose consumption (as detectable by means of 18F FDG-PET/CT) in the population examined. A total of 129 patients (72 females and 57 males) with a diagnosis of probable AD according to the NINCDS-ADRDA criteria underwent the PET/CT examination. The mean (SD) age of the patients was 70 (± 7) years; the mean Mini-Mental State Examination was 19(± 5.6). 59 expressed epsilon 4 phenotype (E4) and 70 expressed the epsilon 3 phenotype (E3). Cerebral spinal fluid amyloid, tau, and t-tau have been measured resulting equal to 367.4 (± 149.1), 584.7 (± 312.1), and 79.2(± 45.9) pg/ml, respectively. Patients with confirmed amyloid and Tau changes were classified as AD. Patients with amyloid changes but negative Tau, considered as high risk of AD, were classified as IAD. Age, sex, MMSE, scholarship, and CSF parameters were used as a covariate in the SPM analyses. We did not find significant differences in age, gender, and MMSE and CSF parameters among groups. In the analysis of the AD group as compared to AD-E3, AD-E4 subjects show a significant reduction of brain glucose consumption in inferior frontal gyrus bilaterally (BA 45, BA 47). In the analysis of the IAD group as compared to IAD-E3, IAD-E4 subjects show a significant reduction of brain glucose consumption in right in medial, middle, and superior frontal gyrus (BA10, BA11), and in left medial and middle frontal gyrus (BA10, BA11). The differences between IAD-E3 and AD-E3 and between IAD-E4 and AD-E4 (and vice versa analysis) resulted not significant. APO-e4 is related to a major involvement of the frontal cortex confirming its role of risk factor in AD, while APO-3 seems not related to a specific pattern, supporting the hypothesis of neutral/protective role in AD. 相似文献