全文获取类型
收费全文 | 23043篇 |
免费 | 1445篇 |
国内免费 | 151篇 |
专业分类
耳鼻咽喉 | 221篇 |
儿科学 | 499篇 |
妇产科学 | 473篇 |
基础医学 | 2634篇 |
口腔科学 | 829篇 |
临床医学 | 2138篇 |
内科学 | 4802篇 |
皮肤病学 | 449篇 |
神经病学 | 1415篇 |
特种医学 | 654篇 |
外国民族医学 | 5篇 |
外科学 | 3217篇 |
综合类 | 619篇 |
一般理论 | 20篇 |
预防医学 | 2011篇 |
眼科学 | 821篇 |
药学 | 2149篇 |
中国医学 | 227篇 |
肿瘤学 | 1456篇 |
出版年
2024年 | 22篇 |
2023年 | 262篇 |
2022年 | 658篇 |
2021年 | 1225篇 |
2020年 | 803篇 |
2019年 | 994篇 |
2018年 | 1191篇 |
2017年 | 835篇 |
2016年 | 887篇 |
2015年 | 907篇 |
2014年 | 1205篇 |
2013年 | 1415篇 |
2012年 | 1969篇 |
2011年 | 2057篇 |
2010年 | 1195篇 |
2009年 | 923篇 |
2008年 | 1371篇 |
2007年 | 1252篇 |
2006年 | 1075篇 |
2005年 | 983篇 |
2004年 | 780篇 |
2003年 | 667篇 |
2002年 | 563篇 |
2001年 | 102篇 |
2000年 | 106篇 |
1999年 | 102篇 |
1998年 | 76篇 |
1997年 | 67篇 |
1996年 | 64篇 |
1995年 | 67篇 |
1994年 | 45篇 |
1993年 | 57篇 |
1992年 | 55篇 |
1991年 | 43篇 |
1990年 | 60篇 |
1989年 | 49篇 |
1988年 | 35篇 |
1987年 | 34篇 |
1986年 | 33篇 |
1985年 | 22篇 |
1984年 | 33篇 |
1983年 | 28篇 |
1982年 | 25篇 |
1981年 | 21篇 |
1980年 | 26篇 |
1979年 | 31篇 |
1978年 | 24篇 |
1976年 | 19篇 |
1974年 | 20篇 |
1973年 | 20篇 |
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
1.
2.
3.
Aaron Pitzele Mohammad Rahimi Eric Armbrecht 《The journal of maternal-fetal & neonatal medicine》2015,28(15):1770-1773
Objective: To determine whether packed red blood cell (PRBC) transfusion affects post-prandial superior mesenteric artery blood flow velocities (SMA BFVs) in very-low birth weight (VLBW) neonates and if so, at what time point after transfusion restoration of previous SMA BFV patterns occurs.Design/Methods: VLBW pre-term neonates, older than 14 days and tolerating bolus enteral feedings administered every 3?h were enrolled in this prospective observational study. Pulsed Doppler ultrasound was used to measure pre- and post-prandial (at 45?min) time-averaged mean, peak and end diastolic velocities (TAMV, PSV, EDV) immediately before and after 15?ml/kg of PRBC transfusion was given over 3?h; patent ductus arteriosus (PDA) status was also evaluated. Subsequent pre- and post-prandial SMA BFVs were recorded 24 and 48?h after the transfusion.Results: Pre- and post-prandial measurements were obtained for 21 out of 25 enrolled infants. Post-prandial SMA BFVs were attenuated during the feedings immediately after transfusion; at 24 and 48?h after transfusion, changes in post-prandial SMA BFVs were similar to those measured prior to transfusion; the presence of the PDA did not affect results.Conclusions: PRBC transfusion blunted SMA BFV responses to feedings immediately after the transfusion with normalization observed 24?h post-transfusion. 相似文献
4.
Adel A. Mahmoud Tayseer Abdelmagid Mohammed AlGhofely Ahmed M. Hamed Roaa Al Sharif 《Neurosciences (Riyadh, Saudi Arabia)》2020,25(3):200
Objectives:To report if the association of epilepsy in pediatric patients (below the age of 15 years) with Insulin-dependent Diabetes (IDDM) at King Fahad Medical City (KFMC) is higher than the prevalence of epilepsy in the same age group (who have no IDDM) in our community. Consequently, we would determine if there is a relationship between the presence of epilepsy in diabetic children and the presence of positive antiGAD65 antibodies.Methods:This cohort study included 305 pediatric patients below the age of 15 years with Insulin-dependent Diabetes Mellitus (IDDM). They were randomly recruited at the Pediatric Endocrinology Clinic in KFMC. The patients’ caregivers were given a questionnaire between December 2015 till March 2019 to determine the seizure disorder history. There was also a retrospective review of 214 patients’ files for anti-GAD 65 positivity.Results:Our study found a significant relation between the presence of epilepsy in children with IDDM. Therefore, we could confirm the relationship between the existence of epilepsy in children with IDDM and having positive GAD65 antibodies.Conclusion:Our study supports the presence of consistent relation between having IDDM and having epilepsy in children and between the latter and the presence of positive GAD65 antibodies.Insulin dependent diabetes Mellitus (IDDM) is a common condition in children and adolescents worldwide and so is epilepsy.1,2 Recently, there were increasing reports suggesting a potential association between having IDDM and the occurrence of epilepsy.3 Their association might represent simply a chance to relate their underlying mechanisms. However, the cause-effect relationship is not fully well defined. Literature from other countries have shown the increased prevalence of seizure disorders in this group of patients.4,5 There are scarce studies in the literature investigating IDDM characteristics contributing to having epilepsy, including positive GAD 65 antibodies. In this study that ran in King Fahad Medical City, Riyadh, Kingdom of Saudi Arabia (KSA) we are aiming to determine if the prevalence of epilepsy among 1DDM children under the age of 15 years (in our center) is higher than controls (same age without IDDM), and to check the positivity of anti-GAD 65 amongst those patients in order to find if there is a relationship between epilepsy in children with diabetes and the presence of positive GAD65 Antibodies. 相似文献
5.
Ahmed M. Abu El-Asrar Ajmal Ahmad Eef Allegaert Mohammad Mairaj Siddiquei Priscilla W. Gikandi Gert De Hertogh 《Ocular immunology and inflammation》2020,28(4):575-588
ABSTRACT
Purpose
To investigate the expression of IL-11 and its receptor IL-11Rα and to quantify density of CD163+ M2 macrophages in proliferative diabetic retinopathy (PDR). 相似文献6.
7.
8.
9.
10.
Mohammad Kogani Seyed Ahmad Almasi Alireza Ansari-Mogaddam Sahar Dalvan Hassan Okati-Aliaba Seyed Mehdi Tabatabaee Seyedeh Zeinab Almasi 《中华创伤杂志(英文版)》2020,23(6):319-323
Purpose: Traffic accidents are one of the major health problems in the world, being the first cause of burden of illness and the second leading cause of death in Iran. The Sistan-Baluchestan province is one of the most accidental provinces of Iran with the highest rate of accidents-caused deaths. This study was conducted to determine the risk factors associated with traffic accidents in Zahedan through 2013 to 2016.
Methods: This analytical cross-sectional study was carried out on 223 drivers from Zahedan who were traumatized by traffic accident and sent to Zahedan hospitals. The data were obtained through interviews taken by the trained interviewers via refereeing to the medical records and collected in the researcher-made checklist. Census was obtained from the study subjects. For data analysis, independent t-test, one-way ANOVA, Chi-square and logistic regression were used with the Stata software version 11.0.
Results: In this study, 223 male subjects with the mean age of (32.54 ± 12.95) years, 39.8% single and 60.2% married, entered for investigation. Most accidents (38.8%) occurred between 12:00 to 17:59. While driving, 47.1% of the study subjects were using cell phones, 89.1% had manual use of mobile phones, 21.9% had a habit of sending short message service (SMS) and 23.4% had sent SMS within 10 min before the accident. The one way analysis of variance showed that the mean age of individuals with marital status, driving experience, education and accident with motorcycle were significantly different (p < 0.05). Also, the multivariate logistic regression test indicated a significant relationship of smoking, ethnicity, insurance and SMS typing while driving with motorcycle accident (p < 0.05).
Conclusion: In this study, SMS and smoking while driving had the highest risk among the variables studied in the motorcycle accidents. Therefore, effective education attempting to enhance people''s awareness about the consequences of using cell phone and smoking during driving to reduce traffic accidents seems necessary. 相似文献