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1.
We identified Candidatus Borrelia fainii, a human pathogenic bacterium causing New World relapsing fever in a Myotis bat in eastern China. This finding expands knowledge about the geographic distribution of Borrelia spp. and the potential for infection with New World relapsing fever in China.  相似文献   
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The spike protein of coronavirus is key target for drug development and other pharmacological interventions. In current study, we performed an integrative approach to predict antigenic sites in SARS-CoV-2 spike receptor binding domain and found nine potential antigenic sites. The predicted antigenic sites were then assessed for possible molecular similarity with other known antigens in different organisms. Out of nine sites, seven sites showed molecular similarity with 54 antigenic determinants found in twelve pathogenic bacterial species (Mycobacterium tuberculosis, Mycobacterium leprae, Bacillus anthracis, Borrelia burgdorferi, Clostridium perfringens, Clostridium tetani, Helicobacter Pylori, Listeria monocytogenes, Staphylococcus aureus, Streptococcus pyogenes, Vibrio cholera and Yersinia pestis), two malarial parasites (Plasmodium falciparum and Plasmodium knowlesi) and influenza virus A. Most of the bacterial antigens that displayed molecular similarity with antigenic sites in SARS-CoV-2 RBD (receptor binding domain) were toxins and virulent factors. Antigens from Mycobacterium that showed similarity were mainly involved in modulating host cell immune response and ensuring persistence and survival of pathogen in host cells. Presence of a large number of antigenic determinants, similar to those in highly pathogenic microorganisms, not merely accounts for complex etiology of the disease but also provides an explanation for observed pathophysiological complications, such as deregulated immune response, unleashed or dysregulated cytokine secretion (cytokine storm), multiple organ failure etc., that are more evident in aged and immune-compromised patients. Over-representation of antigenic determinants from Plasmodium and Mycobacterium in all antigenic sites suggests that anti-malarial and anti-TB drugs can prove to be clinical beneficial for COVID-19 treatment. Besides this, anti-leprosy, anti-lyme, anti-plague, anti-anthrax drugs/vaccine etc. are also expected to be beneficial in COVID-19 treatment. Moreover, individuals previously immunized/vaccinated or had previous history of malaria, tuberculosis or other disease caused by fifteen microorganisms are expected to display a considerable degree of resistance against SARS-CoV-2 infection. Out of the seven antigenic sites predicted in SARS-CoV-2, a part of two antigenic sites were also predicted as potent T-cell epitopes (KVGGNYNYL444-452 and SVLYNSASF366-374) against MHC class I and three (KRISNCVADYSVLYN356-370, DLCFTNVYADSFVI389-402, and YRVVVLSFELLHA508-520) against MHC class II. All epitopes possessed significantly lower predicted IC50 value which is a prerequisite for a preferred vaccine candidate for COVID-19.  相似文献   
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伯氏疏螺旋体共有13个基因种,国内分离到的菌株包括5个基因种[1-3],本研究对黑龙江地区啮齿动物中伯氏疏螺旋体进行分子流行病学调查和分析. 1.材料与方法: (1)样本采集、处理及DNA提取:2009-2011年4-7月从黑龙江林区采用夹夜法采集野鼠,每样点100×2夹次,按5m距离布放鼠夹,晚放晨收.现场鉴定鼠种后,将捕获的鼠放入鼠袋内,乙醚麻醉后,消毒,无菌取脾脏低温保存.采用天根生化科技(北京)有限公司血液/细胞/组织基因组DNA提取试剂盒提取脾脏DNA,-20℃贮存备用.  相似文献   
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Abstract

Objective: To describe transverse myelitis secondary to coexistent Lyme disease and babesiosis.

Method: Case report.

Background: A 7 4-year-old man presented with rapid onset of weakness, numbness, and tingling in his legs, with symptoms ascending to his hands and forearms within days. He recalled an insect bite to his scapular area 2 weeks earlier.

Findings: T2-weighted magnetic resonance imaging demonstrated diffuse hyperintensity from T1 through T1 2. Western blot and enzyme-linked immunosorbent assay identified infection with Borrelia burgdorferi, the spirochete responsible for Lyme disease. Giemsa-stained blood smears identified ring forms later recognized by polymerase chain reaction as Babesia microti, the piroplasm responsible for babesiosis. Initial examination revealed C7 motor and T3 sensory complete tetraplegia, with recovery to T 4 paraplegia by 2 months.

Conclusion: The history, physical examination, imaging, and serologic studies were consistent with transverse myelitis related to Lyme disease and babesiosis. The severity and permanence of this patient’s deficits were greater than those reported in the majority of previous cases of transverse myelitis due to Lyme disease alone, suggesting a possible role for coinfection with babesiosis.  相似文献   
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Whether Borrelia burgdorferi, the causative agent of Lyme disease, can persist after antibiotic therapy is an area of ongoing controversy. In animal models, B. burgdorferi DNA can be detected in tissues after antibiotic therapy as well as by using the natural tick vector to acquire the organism through feeding (xenodiagnosis). Vector arthropods have been successfully used in xenodiagnosis to describe the etiology of infections such as malaria, typhus and Chagas disease. Our recent safety trial of xenodiagnosis demonstrates that ticks may be successfully fed on patients and may help determine the biological basis for post-treatment Lyme disease syndrome.  相似文献   
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李静  梁张  宝福凯  柳爱华 《中国热带医学》2013,13(8):1035-1038,1042
莱姆病是由伯氏疏螺旋体感染引起的自然疫源性人兽共患传染病.临床表现复杂多样,可引起多系统、多器官的损害.莱姆病在全世界范围内广泛流行,对人类的健康造成严重危害,而且近年来呈上升趋势.因此,对莱姆病流行病学的深入研究可以有效预防和控制该病的流行蔓延.本文主要从莱姆病的病原体、传染源和传播途径、流行特征等方面对该病的流行病学进展进行较为系统的介绍.  相似文献   
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为了解新疆北部林区工作人员嗜吞噬细胞无形体病、森林脑炎、莱姆病3种蜱传疾病感染情况,采集新疆北部林区工作人员血清标本215份,采取间接免疫荧光法检测血清中嗜吞噬细胞无形体、森林脑炎病毒、伯氏疏螺旋体特异性IgG抗体.经检测嗜吞噬细胞无形体IgG抗体阳性率为40.47% (87/215),森林脑炎病毒IgG抗体阳性率为20.00% (43/215),莱姆病伯氏疏螺旋体IgG抗体阳性率为10.70% (23/215).共检测出29例复合感染,复合感染率为13.49% (29/215).其中嗜吞噬细胞无形体和森林脑炎病毒复合感染率6.05% (13/215),嗜吞噬细胞无形体和莱姆病伯氏疏螺旋体复合感染率3.72% (8/215),森林脑炎病毒和莱姆病伯氏疏螺旋体复合感染率1.40% (3/215),三种病原体复合感染率2.33% (5/215).新疆北部林区工作人员中存在嗜吞噬细胞无形体病、森林脑炎、莱姆病及其复合感染流行.  相似文献   
10.
Objectives. We examined IgG antibody seroprevalence and risk factors for anti-Toxoplasma gondii and anti-Borrelia sp. in schizophrenic patients. Methods. This case–control study included 30 schizophrenic patients and 60 healthy individuals. Serological analyses were identified by using ELISA technique. Results. In the case group the Toxoplasma seropositivity was 33.3% and Borrelia seropositivity was 13.3%, while in the control group the Toxoplasma positivity was 21.7% and Borrelia seropositivity was 15.0%. There was no significant difference with regard to seroprevalence between the groups (P = 0.232; P = 0.832, respectively). There was statistically significant difference between case and control groups related to hand and kitchen utensil hygiene after dealing with raw meat (P = 0.001). Conclusions. Our data showed the rate of Toxoplasma antibodies was higher in the case group, while the rate of Borrelia antibodies was higher in the control group. In both groups the high rates of seropositivity for Toxoplasma gondii and Borrelia sp. is thought to be due to neglect of personal hygiene. The present study also is the first to examine the association between Borrelia sp. and schizophrenia. Further studies are needed to determine whether there is an association between Borrelia sp. and schizophrenia or not.  相似文献   
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