首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   899篇
  免费   91篇
  国内免费   12篇
耳鼻咽喉   1篇
儿科学   10篇
妇产科学   19篇
基础医学   67篇
口腔科学   25篇
临床医学   123篇
内科学   142篇
皮肤病学   17篇
神经病学   27篇
特种医学   41篇
外国民族医学   1篇
外科学   89篇
综合类   91篇
预防医学   133篇
眼科学   4篇
药学   101篇
  1篇
中国医学   59篇
肿瘤学   51篇
  2024年   9篇
  2023年   34篇
  2022年   63篇
  2021年   59篇
  2020年   48篇
  2019年   42篇
  2018年   35篇
  2017年   18篇
  2016年   27篇
  2015年   48篇
  2014年   42篇
  2013年   50篇
  2012年   67篇
  2011年   64篇
  2010年   28篇
  2009年   24篇
  2008年   51篇
  2007年   44篇
  2006年   42篇
  2005年   44篇
  2004年   37篇
  2003年   41篇
  2002年   37篇
  2001年   6篇
  2000年   2篇
  1999年   5篇
  1998年   6篇
  1996年   4篇
  1995年   3篇
  1994年   4篇
  1993年   3篇
  1992年   1篇
  1991年   1篇
  1990年   4篇
  1988年   2篇
  1986年   1篇
  1985年   3篇
  1984年   1篇
  1983年   1篇
  1981年   1篇
排序方式: 共有1002条查询结果,搜索用时 734 毫秒
1.
To examine the knowledge level, behaviors, and psychological status of the Chinese population during the COVID-19 pandemic, and to explore the differences between urban and rural areas.We carried out a cross-sectional survey of the knowledge, behaviors related to COVID-19, and mental health in a probability sample of 3001 community residents in 30 provinces or districts across China from February 16–23, 2020. Convenience sampling and a snowball sampling were adopted. We used General Anxiety Disorder (GAD), the 9-item Patient Health Questionnaire (PHQ-9), and knowledge and behaviors questionnaire of community residents regarding COVID-19 designed by us to investigate the psychological status, disease-related knowledge, and the behavior of Chinese urban and rural residents during the pandemic.The average score of anxiety and depression among urban residents was 9.15 and 11.25, respectively, while the figures in rural areas were 8.69 and 10.57, respectively. There was a statistically significant difference in the levels of anxiety (P < .01) and depression (P < .01). Urban participants reported significantly higher levels of knowledge regarding COVID-19 in all aspects (transmission, prevention measures, symptoms of infection, treatment, and prognosis) (P < .01), compared to their rural counterparts. While a majority of respondents in urban areas obtained knowledge through WeChat, other apps, and the Internet (P < .01), residents in rural areas accessed information through interactions with the community (P < .01). Urban residents fared well in exchanging knowledge about COVID-19 and advising others to take preventive measures (P < .01), but fared poorly in advising people to visit a hospital if they displayed symptoms of the disease, compared to rural residents (P < .01). Regression analysis with behavior showed that being female (OR = 2.106, 95%CI = 1.259–3.522), aged 18 ≤ age < 65 (OR = 4.059, 95%CI = 2.166–7.607), being satisfied with the precautions taken by the community (OR = 2.594, 95%CI = 1.485–4.530), disinfecting public facilities in the community (OR = 2.342, 95%CI = 1.206–4.547), having knowledge of transmission modes (OR = 3.987, 95%CI: 2.039, 7.798), symptoms (OR = 2.045, 95%CI = 1.054–4.003), and outcomes (OR = 2.740, 95%CI = 1.513–4.962) of COVID-19, and not having anxiety symptoms (OR = 2.578, 95%CI = 1.127–5.901) were positively associated with affirmative behavior in urban areas. Being married (OR = 4.960, 95%CI = 2.608–9.434), being satisfied with the precautions taken by the community (OR = 2.484, 95%CI = 1.315–4.691), screening to ensure face mask wearing before entering the community (OR = 8.809, 95%CI = 2.649–19.294), and having knowledge about precautions (OR = 4.886, 95%CI = 2.604–9.167) and outcomes (OR = 2.657, 95%CI = 1.309–5.391) were positively associated with acceptable conduct in rural areas.The status of anxiety and depression among urban residents was more severe compared to those living in rural areas. There was a difference in being positively associated with constructive behaviors between rural and urban areas.  相似文献   
2.
中医药高等院校专业建设应随着社会的进步发展和社会的需求而不断拓宽、延伸其专业领域,本文从中医药高校的专业延伸的必要性、建设原则以及专业延伸的思路等三个方面对中医药高等院校的专业建设工作提出了几点思考。  相似文献   
3.
4.
5.
Dapsone, used for prevention of Pneumocystis jirovecii infections, has been reported to cause hemolytic anemia and methemoglobinemia; its tolerability in solid organ transplant recipients is not well described. We investigated dapsone-related adverse events in patients undergoing solid organ transplantation from 1999 to 2004. Transplant providers identified patients for the investigators who then reviewed the patients' hospital and outpatient records. Sixteen solid organ transplant recipients fit case definitions for dapsone-related hemolytic anemia (n = 11) or methemoglobinemia (n = 5). Median time from event to dapsone discontinuation was 15 days; all patients improved after drug discontinuation. G6PD enzyme activity was normal in all patients whose test results were available. Dapsone may be associated with hemolytic anemia or methemoglobinemia, even with normal G6PD levels. These events are often not promptly recognized, and drug discontinuation is delayed. Dapsone-related hemolytic anemia or methemoglobinemia should be considered in solid organ transplant recipients with unexplained anemia or hypoxia.  相似文献   
6.
Purkinje cells, the sole output of the cerebellar cortex, encode the timing signals required for motor coordination in their firing rate and activity pattern. Dendrites of Purkinje cells express a high density of P/Q-type voltage-gated calcium channels and fire dendritic calcium spikes. Here we show that dendritic subthreshold Kv1.2 subunit-containing Kv1 potassium channels prevent generation of random spontaneous calcium spikes. With Kv1 channels blocked, dendritic calcium spikes drive bursts of somatic sodium spikes and prevent the cell from faithfully encoding motor timing signals. The selective dendritic function of Kv1 channels in Purkinje cells allows them to effectively suppress dendritic hyperexcitability without hindering the generation of somatic action potentials. Further, we show that Kv1 channels also contribute to dendritic integration of parallel fibre synaptic input. Kv1 channels are often targeted to soma and axon and the data presented support a major dendritic function for these channels.  相似文献   
7.

Background

Pancreatic mucinous cystic neoplasms (MCN) are rare tumors that are usually diagnosed in females.

Materials and methods

In our department, only four of the 109 consecutive cases of pancreatic tumors (3.67%) were diagnosed as MCNs. In this report, we present the characteristics of these four specific cases which also showed unusual HER-2 positivity and neuroendocrine differentiation.

Results

The four MCNs were diagnosed in patients with ages between 46 and 75 years. Other clinical particularities were the following: one benign case, splenic rupture as result of a giant cystic tumor on the tail of the pancreas directly invading the spleen in the second one, metastases in the accessory spleen in the third one and invasion of the abdominal vessels in the fourth case. In all of these cases, the ovarian-like stroma tested positivity for calretinin, progesterone receptor (PR) and, in cases 2 and 3, for AE1/AE3 keratin. The malignant tumor cells were marked by carcinoembryonic antigen, HER-2, maspin, PR and the neuroendocrine markers synaptophysin, CD56, and neuron-specific enolase.

Conclusions

These cases highlight the unusually aggressive behavior of pancreatic MCN with invasive carcinomas that share mixed exo- and endocrine components and show epithelial-mesenchymal transition.  相似文献   
8.
“全国文明单位”称号是国家综合评比一个单位精神文明建设成果的最高褒奖。良好的医院形象是提升医院综合实力、增强其竞争力的重要手段。医院每年制定文明创造重点,明确文明创造的目标、任务和重点,将文明创造工作与业务工作结合起来进行规划、实施、考核和奖惩。医院设有精神文明建设领导小组和办公室,隶属党办,负责精神文明建设的日常协调和指导工作。文明永无止境。文明创造是一项系统工作,它整合全院资源,整合党、工团、妇委会等各种力量,“青年文明号”“巾帼文明岗”不断树立品牌支持创建工作。医院积极营造“文明单位、共建共享、全员参与、人人受益”的良好氛围。文明建设扎实推进,医院建设更加健康有序。结合福建省肿瘤医院连续三届获评“全国文明单位”的创建经验,从医院人员素质、中心工作、社会责任、文化、决策和环境等方面入手,阐述医院文明创建对医院发展的作用。  相似文献   
9.
目的:观察自拟益气养阴通络方联合康复训练治疗气阴两虚型帕金森病(PD)的临床疗效。方法:将120例PD患者纳入研究,按随机奇偶数法分为对照组和治疗组各60例。对照组给予多巴丝肼片治疗,治疗组采用益气养阴通络方联合康复训练治疗。治疗3个月后评定2组临床疗效、颤证功能障碍积分、自主神经症状自评量表(SCOPA-AUT)评分、PD运动功能量表(MDRSPD)评分及血清神经营养因子[脑源性神经营养因子(BDNF)、胰岛素样生长因子1 (IGF-1)、人神经营养因子3 (NT-3)]水平。结果:治疗组总有效率为93.33%,高于对照组80.00%,2组比较,差异有统计学意义(P<0.05)。治疗前,2组颤证功能障碍积分比较,差异无统计学意义(P>0.05);治疗后,2组颤证功能障碍积分均较治疗前降低(P<0.05),且治疗组颤证功能障碍积分低于对照组(P<0.05)。治疗前,2组SCOPA-AUT、MDRSPD评分比较,差异无统计学意义(P>0.05);治疗后,2组上述2项评分较治疗前明显降低(P<0.05),且治疗组2项评分均低于对照组(P<0.05)...  相似文献   
10.
Currently, the clinical factors affecting immune responses to influenza vaccines have not been systematically explored. The mechanism of low responsiveness to influenza vaccination (LRIV) is complicated and not thoroughly elucidated. Thus, we integrate our in-house genome-wide association studies (GWAS) analysis result of LRIV (N = 111, Ncase [Low Responders] = 34, Ncontrol [Responders] = 77) with the GWAS summary of 10 blood-based biomarkers (sample size ranging from 62 076−108 794) deposited in BioBank Japan (BBJ) to comprehensively explore the shared genetics between LRIV and blood-based biomarkers to investigate the causal relationships between blood-based biomarkers and LRIV by Mendelian randomization (MR). The applications of four MR approaches (inverse-variance-weighted [IVW], weighted median, weighted mode, and generalized summary-data-based MR [GSMR]) suggested that the genetically instrumented LRIV was associated with decreased eosinophil count (β = −5.517 to −4.422, p = 0.004−0.039). Finally, we conclude that the low level of eosinophil count is a suggestive risk factor for LRIV.  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号