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3D-FIESTA和FRFSE T2WI对后颅窝神经成像效能的对比研究 总被引:1,自引:1,他引:1
目的:比较3D-FIESTA和FRFSE T2WI序列对后颅窝第Ⅴ-Ⅻ对脑神经脑池段的显示效果。材料和方法:对40例320对颅神经行3D-FIESTA和FRFSE T2WI扫描,由2名放射诊断副主任医师结合多平面重组(MPR)进行独立回顾性分析,MR表现分成3级(0级:无显示,1级:部分显示,2级:全部显示)。结果:320对脑神经在3D-FIESTA和FRFSE T2WI中显示率(1级和2级)分别为:第Ⅴ对神经(100%,100%)、第Ⅵ对神经(98.75%,42.00%)、第Ⅶ对神经(100%,100%)、第Ⅷ对神经(100%。100%)、第Ⅸ~Ⅺ对神经组(低位神经)(100%,74%)、第Ⅻ对神经(95%,3.75%)。结论:T2WI对后颅窝脑神经显示效果,3D—FIESTA优于FRFSE,可用于获得脑池段脑神经高分辨率MR成像。 相似文献
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凝血酶激活的纤溶抑制物(thrombin-activatable fibrinolysis inhibitor,TAFI)是近年来发现的存在于血浆中的一种以无活性的酶原形式存在的单链糖蛋白,其活化产物TAFIa主要通过使纤溶酶失去与纤维蛋白的结合作用位点抑制纤溶,所以TAFI在血栓性疾病如缺血性脑血管疾病的发生、发展过程中发挥重要作用,而参与TAFI生成的编码及调控的基因多态性位点也得到了医学界很大的关注. 相似文献
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肾上腺髓性脂肪瘤的影像学诊断 总被引:2,自引:0,他引:2
肾上腺髓性脂肪瘤是一种少见的无功能良性肿瘤,一般无症状,不易被发现,文献报道仅200余例[1].随着US、CT等检查手段的广泛应用,近年来报告逐渐增多.作者对1997年1月~2002年7月经手术病理证实的肾上腺髓性脂肪瘤11例,结合文献,探讨影像学诊断价值. 相似文献
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目的探讨MSCT Pinpoint系统导引下胸部穿刺活检技术要点及并发症分析。方法用COOK公司18~21G穿刺活检针取样。选取2004年5月至2005年5月应用Pinpoint系统行活检80例。结果80例应用Pin-point系统行穿刺活检的患者中,穿刺成功率98.8%(79/80),活检正确率为97.5%(78/80例)。并发症,气胸7.5%(6/80),针道出血10%(8/80)。结论MSCT Pinpoint系统导引下胸部穿刺活检定位精确,成功率高,是安全的,但操作医生的熟练技术相当重要,并且可以减少并发症的发生。 相似文献
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本文报告经临床证实的系统性红斑狼疮108例中69例(67.60%)有不同程度的心脏损害。女性62例(89.96%),21~40岁50例(72.46%)。心脏损害的主要临床表现有心悸、心脏杂音、高血压和心电图、超声心动图异常。81.20%的患者X线表现心脏增大,心脏外形大多呈主动脉型及普大型,69.65%的患者有肺瘀血,部分患者有胸腔积液、间质性肺炎等改变。所有的心肺X线表现并不具特征性,诊断必须结合临床表现、心电图检查及X线表现这三项资料,而X线检查对观察心包炎,肺循环、胸、肺改变较其他检查为优。因此,重视X线表现,对提高系统性红斑狼疮心脏损害的检出率,具有较大意义。 相似文献
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BACKGROUND: Previous studies have demonstrated that Piper futokadsura stem selectively inhibits expression of amyloid precursor protein (APP) at the mRNA level. In addition, the piperlonguminine (A) and dihydropiperlonguminine (B) components (1 : 0.8), which can be separated from Futokadsura stem, selectively inhibit expression of the APP at mRNA and protein levels. OBJECTIVE: Based on previous findings, the present study investigated the effects of β-site amyloid precursor protein cleaving enzyme (BACE1) and APP genes on the production of β-amyloid peptide 42 (Aβ42) in human neuroblastoma cells (SK-N-SH cells) using small interfering RNAs (siRNAs) and A/B components separated from Futokadsura stem, respectively. DESIGN, TIME AND SETTING: A gene interference-based randomized, controlled, in vitro experiment was performed at the Key Laboratory of Cardiovascular Remodeling and Function Research, Ministries of Education and Public Health, and Institute of Pharmacologic Research, School of Pharmaceutical Science & Department of Biochemistry, School of Medicine, Shandong University between July 2006 and December 2007. MATERIALS: SK-N-SH cells were provided by Shanghai Institutes of Biological Sciences, Chinese Academy of Sciences, Shanghai, China; mouse anti-human BACE1 monoclonal antibody was purchased from R&D Systems, USA; mouse anti-human APP monoclonal antibody was purchased from Cell Signaling Technology, USA; and horseradish peroxidase (HRP)-conjugated goat anti-mouse IgG was provided by Sigma, USA. METHODS: The human BACE1 cDNA sequence was obtained from NCBI website (www.ncbi.nlm.nih.gov/sites/entrez). Three pairs of siRNAs, specific to human BACE1 gene, were synthesized through the use of Silencer pre-designed siRNA specification, and were transfected into SK-N-SH cells with siPORT NeoFX transfection agent to compare the effects of different concentrations of siRNAs (10-50 nmol/L) on SK-N-SH cells. Futokadsura stem was separated and purified with chemical methods, and the crystal was composed of A/B components, with an A to B ratio of 1:0.8. The A/B (1 : 0.8) components were added to the SK-N-SH cells at different concentrations (13.13, 6.56, and 3.28 mg/mL). MAIN OUTCOME MEASURES: Using RT-PCR and Western blot methods, BACE1 and APP expression at mRNA and protein levels was detected in SK-N-SH cells following treatment with different siRNAs and concentrations of Futokadsura stem-separated A/B components, respectively. Altered Aβ42 secretion by SK-N-SH cells was determined by ELISA. RESULTS: BACE1 mRNA and protein levels were significantly suppressed by 40 and 50 nmol/L siRNAs at 48 hours post-transfection. A/B components (1 : 0.8), which were separated from Futokadsura stem, selectively inhibited mRNA and protein expression of APP in SK-N-SH cells. Aβ42 secretion by SK-N-SH cells was significantly decreased following treatment with siRNAs or A/B components. CONCLUSION: Inhibition of BACE1 and APP genes by various materials and methods efficiently decreased production of Aβ42. 相似文献