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1420篇 您的检索式:作者名="Torres LA"
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1Mechanical properties of the A356 aluminum alloy modified with La/Ce显示文摘The research of rare earths for the synthesis of materials with improved mechanical performance is of great interest when they are considered for potential applications in the automotive industry. In this regard, the effect on the mechanical properties and microstructure of the automotive A356 aluminum alloy reinforced with 0.2 (wt.%) Al-6Ce-3La (ACL) was investigated. The ACL was added to the melted A356 alloy in the as-received condition and processed by mechanical milling. In the second route, the effect of the ACL processed by mechanical milling and powder metallurgy techniques was investigated, and compared with the results obtained from the A356 alloy strengthened with ACL in the as-received condition. Microstructural properties were evaluated by means of X-ray diffraction in order to observe the solubility of Ce/La in the Al matrix. In addition, electron microscopy was employed in order to investigate the effect of milling time on the size and morphology of La/Ce phase under milling process. Mechanical properties of the A356 alloy modified with ACL were measured by hardness and tensile test. For comparison unmodified specimens of the A356 were characterized according to the previous procedure. The microstructural and mechanical characterization was carried out in specimens after solution and artificial aging. Observations in scanning electron microscopy indicated a homogeneous dispersion of La/Ce phases by using both routes; however, mechanical results, in the modified A356 alloy with the ACL in the as-received condition, showed an improvement in the mechanical performance of the A356 alloy over that reinforced with the ACL mechanically milled.E. Aguirre-De la Torre R. Pérez-Bustamante J. Camarillo-Cisneros C.D. Gómez-Esparza H.M. Medrano-Prieto R. Martínez-Sánchez 2013Journal of Rare Earths2013,31,8:25
2放电等离子超快速烧结SiC-Al_2O_3纳米复相陶瓷显示文摘本文介绍用非均相沉淀法制备的纳米SiC-Al2O3复合粉体经放电等离子超快速烧结得到晶内型的纳米复相陶瓷,超快速烧结的升温速率为600℃/min,在烧结温度不保温,迅即在3min内冷却至600℃以下.与热压烧结相比,可降低烧结温度200℃以上.力学性能研究结果表明,在1450℃超快速烧结得到的纳米复相陶瓷的抗弯强度高达1000MPa,维氏硬度为19GPa,断裂韧性也比Al2O3有所提高.TEM像显示纳米SiC颗粒大多分布在Al2O3母体晶粒内,而断裂表面的SEM像表明,穿晶断裂是其主要的断裂模式,这是所制备的纳米复相陶瓷力学性能大幅提高的主要原因.高濂 王宏志 洪金生 宫本大树 DIAZ DE LA TORRE SEBASTIAN 1999无机材料学报1999,14,1:22
3冠状动脉内影像学临床应用专家共识(第一部分):对冠状动脉介入治疗的指导与优化显示文摘欧洲心血管介入协会(EAPCI)专家组系统总结了血管内超声(IVUS)和光学相干断层成像(OCT)这两种血管内影像学检查临床应用指征的现有证据,提供了关于IVUS和OCT指导经皮冠状动脉介入治疗(PCI)的应用价值,并明确了最可能从腔内影像学指导的介入治疗中获得临床收益的患者或病变类型,同时详细论述了PCI前如何使用IVUS或OCT优化支架尺寸(支架长度和直径)和手术策略的选择。此外,专家推荐对支架失败(支架内再狭窄或支架内血栓形成)的患者应常规进行冠状动脉内影像学检查,并首选OCT。最后,重点论述了IVUS和OCT在指导PCI和评估支架失败两个方面的优势和局限性,并对未来需要深入研究的领域进行了展望。Lorenz Raber Gary S Mintz Konstantinos C Koskinas Thomas W Johnson Niels R Holm Yoshinubo Onuma Maria D Radu Michael Joner Bo Yu Haibo Jia Nicolas Meneveau Jose M.de la Torre Hemandez Javier Escaned Jonathan Hill Francesco Prati Antonio Colombo Carlo di Mario Evelyn Regar Davide Capodanno William Wijns Robert A Byme Giulio Guagliumi 2019中华心血管病杂志2019,47,1:17
4Platelet thromboxane(11-dehydro-Thromboxane B_2) and aspirin response in patients with diabetes and coronary artery disease显示文摘Aspirin(ASA) irreversibly inhibits platelet cyclooxygenase-1(COX-1) leading to decreased thromboxane-mediated platelet activation. The effect of ASA ingestion on thromboxane generation was evaluated in patients with diabetes(DM) and cardiovascular disease. Thromboxane inhibition was assessed by measuring the urinary excretion of 11-dehydro-thromboxane B2(11dhTxB2), a stable metabolite of thromboxane A2. The mean baseline urinary 11dhTxB2 of DM was 69.6% higher than healthy controls(P = 0.024): female subjects(DM and controls) had 50.9% higher baseline 11dhTxB2 than males(P = 0.0004), while age or disease duration had no influence. Daily ASA ingestion inhibited urinary 11dhTxB2 in both DM(71.7%) and controls(75.1%, P < 0.0001). Using a pre-established cut-off of 1500 pg/mg of urinary 11dhTxB2, there were twice as many ASA poor responders(ASA 'resistant') in DM than in controls(14.8% and 8.4%, respectively). The rate of ASA poor responders in two populations of acute coronary syndrome(ACS) patients was 28.6 and 28.7%, in spite of a significant(81.6%) inhibition of urinary 11dhTxB2(P < 0.0001). Both baseline 11dhTxB2 levels and rate of poor ASA responders were significantly higher in DM and ACS compared to controls. Underlying systemic oxidative inflammation may maintain platelet function in atherosclerotic cardiovascular disease irrespective of COX-1 pathway inhibition and/or increase systemic generation of thromboxane from non-platelet sources.Luis R Lopez Kirk E Guyer Ignacio Garcia De La Torre Kelly R Pitts Eiji Matsuura Paul RJ Ames 2014World Journal of Diabetes2014,5,2:13
5中国早期人类分布的环境制约因素探讨显示文摘在环境因素起制约作用的背景下,随着中国古人类演化与生存能力的进步,其数量和空间分布在不同时间段呈现出不同的特征。为了更好地了解中国早期人类的时空分布特征,本研究以中国境内已发表的2110处旧石器遗址的坐标和年代信息为基础,采用统计学和空间分析的方法,对遗址的时间分布进行以蒙特卡洛模拟为基础的时间不定性模拟,对遗址的空间分布进行核密度估计和聚类分析;同时,利用环境空间数据集中的海拔、水源、气温和降水信息,对不同时期内各个遗址所在地的环境条件进行统计分析。研究结果表明,在旧石器时代,随着时间的发展,中国境内的遗址数量不断增多,分布范围也逐渐从中部、南部和东部地区向条件较恶劣的北部和西部扩张。其中,600 ka和57 ka为这一变化的两个关键时间点,600 ka之前遗址数量较少,分布也较为局限;在600 ka至57 ka之间,遗址数量缓慢增加,分布范围也在季风区内逐渐扩大;57 ka之后,遗址数量迅速增长,分布遍布中国境内的大部分地区。本文所梳理的中国境内旧石器遗址整体时空分布特征,为进一步解读中国早期人类的环境适应能力,特别是古人类的体质演化和技术进步的环境驱动机制提供参考。丁馨 杜雨薇 徐欣 裴树文 de la Torre Ignacio 高星 2021第四纪研究2021,41,5:10
6Evidence based medicine and surgical approaches for colon cancer: Evidences, benefits and limitations of the laparoscopic vs open resection显示文摘AIM:To report a meta-analysis of the studies that compared the laparoscopic with the open approach for colon cancer resection.METHODS:Forty-seven manuscripts were reviewed,33 of which employed for meta-analysis according to the PRISMA guidelines.The results were differentiated according to the study design(prospective randomized trials vs case-control series)and according to the tu-mor’s location.Outcome measures included:(1)shortterm results(operating times,blood losses,bowel function recovery,post-operative pain,return to the oral intake,complications and hospital stay);(2)oncological adequateness(number of nodes harvested in the surgical specimens);and(3)long-term results(including the survivals’rates and incidence of incisional hernias)and(4)costs.RESULTS:Meta-analysis of trials provided evidences in support of the laparoscopic procedures for a several short-term outcomes including:a lower blood loss,an earlier recovery of the bowel function,an earlier return to the oral intake,a shorter hospital stay and a lower morbidity rate.Opposite the operating time has been confirmed shorter in open surgery.The same trend has been reported investigating case-control series and cancer by sites,even though there are some concerns regarding the power of the studies in this latter field due to the small number of trials and the small sample of patients enrolled.The two approaches were comparable regarding the mean number of nodes harvested and long-term results,even though these variables were documented reviewing the literature but were not computable for meta-analysis.The analysis of the costs documented lower costs for the open surgery,however just few studies investigated the incidence of postoperative hernias.CONCLUSION:Laparoscopy is superior for the majority of short-term results.Future studies should better differentiate these approaches on the basis of tumors’location and the post-operative hernias.Laura Lorenzon Marco La Torre Vincenzo Ziparo Francesco Montebelli Paolo Mercantini Genoveffa Balducci Mario Ferri 2014World Journal of Gastroenterology2014,20,13:8
7Gastroenterology case report of mesalazine-induced cardiopulmonary hypersensitivity显示文摘Mesalazine is a 5-aminosalicylic acid derivative that has been widely used to treat patients with inflammatory bowel disease. Accumulating evidence indicates that mesalazine has a very low rate of adverse drug reactions and is well tolerated by patients. However, a few cases of pulmonary and cardiac disease related to mesalazine have been reported in the past, though infrequently, preventing clinicians from diagnosing the conditions early. We describe the case of a 32-yearold man with ulcerative colitis who was admitted with a two-month history of persistent fever following mesalazine treatment initiated 14 mo earlier. At the time of admission, mesalazine dose was increased from 1.5 to 3.0 g/d, and antibiotic therapy was started with no improvement. Three weeks after admission, the patient developed dyspnea, non-productive cough, and chest pain. Severe eosinophilia was detected in laboratory tests, and a computed tomography scan revealed interstitial infiltrates in both lungs, as well as a large pericardial effusion. The bronchoalveolar lavage reported a CD4/CD8 ratio of 0.5, and an increased eosinophil count. Transbronchial biopsy examination showed a severe eosinophilic infiltrate of the lung tissue. Mesalazine-induced cardiopulmonary hypersensitivity was suspected after excluding other possible etiologies. Consequently, mesalazine treatment was suspended, and corticosteroid therapy was initiated, resulting in resolution of symptoms and radiologic abnormalities. We conclude that mesalazine-induced pulmonary and cardiac hypersensitivity should always be considered in the differential diagnosis of unexplained cardiopulmonary symptoms and radiographic abnormalities in patients with inflammatory bowel disease.José Ferrusquía Isabel Pérez-Martínez Ricardo Gómez de la Torre María Luisa Fernández-Almira Ruth de Francisco Luis Rodrigo Sabino Riestra 2015World Journal of Gastroenterology2015,21,13:5
8High prevalence of viable Mycobacterium avium subspecies paratuberculosis in Crohn's disease显示文摘AIM:To examine the detection rate of viable Mycobacterium avium subspecies paratuberculosis(MAP) in patients with inflammatory bowel disease [Crohn's disease(CD) and ulcerative colitis(UC)].METHODS:Thirty patients with CD(15 with at least one NOD2/CARD15 mutation),29 with UC,and 10 with no inflammatory bowel disease(IBD).were tested for MAP by polymerase chain reaction(specific IS900 fragment) and blood culture.RESULTS:MAP DNA was detected in all original blood samples and 8-wk blood cultures(CD,UC and non-IBD).Positive MAP DNA status was confirmed by dot blot assays.All 69 cultures were negative by acid-fast Ziehl-Neelsen staining.Viable MAP,in spheroplast form,was isolated from the 18-mo blood cultures of all 30 CD patients,one UC patient,and none of the non-IBD controls.No association was found between positive MAP cultures and use of immunosuppressive drugs or CDassociated single nucleotide polymorphisms.CONCLUSION:MAP is widely present in our area and MAP DNA can be recovered from the blood of CD,UC and non-IBD patients.However,MAP spheroplasts were only found in CD patients.Juan L Mendoza Amparo San-Pedro Esther Culebras Raquel Cíes Carlos Taxonera Raquel Lana Elena Urcelay Fernando de la Torre Juan J Picazo Manuel Díaz-Rubio 2010World Journal of Gastroenterology2010,16,36:5
9Survival after radiotherapy in gastric cancer: Systematic review and meta-analysis显示文摘Vincenzo Valentini Francesco Cellini Bruce D. Minsky Gian Carlo Mattiucci Mario Balducci Giuseppe D’Agostino Elisa D’Angelo Nicola Dinapoli Nicola Nicolotti Chiara Valentini Giuseppe La Torre 2009Radiotherapy and Oncology2009,,2:4
10Recovery of Gold, Silver, Copper and Niobium from Printed Circuit Boards Using Leaching Column Technique显示文摘Ricardo Montero Alicia Guevara Ernesto de la Torre 2012Journal of Earth Science and Engineering2012,2,10:3
11AD是一种神经变性还是一种血管病变?显示文摘Jack C de la Torre 杨敏慧 2004中国处方药2004,3,5:3
12The Basic Analytics of Access to Financial Services显示文摘ThorstenBeck AugustoDe La Torre 2007Financial Markets Institutions & Instruments2007,,2:2
13Physiology and Diversity of Ammonia-Oxidizing Archaea显示文摘David A. Stahl José R. de la Torre 2012Annual Review of Microbiology2012,,:2
14The ρ-variation of the Hermitian Riesz Transform显示文摘在这份报纸,我们在 Hilbert 变换和与尺寸 1 的 Hermite 操作符联系的 Riesz 变换的摆动和变化的加权的 L p 空格证明行为。我们证明这个操作员印射 L p (? , w (x) dx ) 进自己 w 什么时候是在 A 的重量为 1 的 p 班 < p < 鈭吗?为 p = 1 我们为 A 得到弱类型 1 个班。加权估计也在极端情况 p = 鈭被获得?关键词摆动 -- 蟻 - 变化单个的 integral-Hermite 操作员先生(2000 ) 题目分类 42B20 - Ministerio de Educaci 贸 n y Ciencia (西班牙) 支持的 42C05,资助 MTM 2008-066621-C02-01/02 和会议 de Andaluc 铆 a,资助 FQM-354 和 P06-FQM-01509;第一个作者被 Fundaci 贸 n 卡罗来纳, Ministerio de Cultura y Educaci 贸 n de la 议员煤 b lica 阿根廷和 Universidad Nacional del ComahueRaquel CRESCIMBENI Francisco Javier MARTíN-REYES Alberto DE LA TORRE José L.TORREA 2010Acta Mathematica Sinica,English Series2010,26,10:2
15Toll‐Like Receptors and Cytokines are Upregulated during H elicobacter pylori Infection in Children显示文摘Hugo Lagunes‐Servin Javier Torres Carmen Maldonado‐Bernal Martha Pérez‐Rodríguez Sara Huerta‐Yépez Armando Madrazo de la Garza Leopoldo Mu?oz‐Pérez Lourdes Flores‐Luna Guillermo Ramón‐García Margarita Camorlinga‐Ponce 2013Helicobacter2013,,6:2
16Quality of Life and Physical Activity in Liver Transplantation Patients: Results of a Case-Control Study in Italy显示文摘D. Masala A. Mannocci B. Unim A. Del Cimmuto F. Turchetta G. Gatto R. Santoro G.M. Ettorre A. Boccia G. La Torre 2012Transplantation Proceedings2012,,5:2
17西印度洋地区海草生态系统显示文摘海草是海洋被子植物,广泛分布在温带和热带的海岸带水域,是地球上水生生态系统中最具生产力的生物之一。在西印度洋地区大概有13种海草,这些海草覆盖了12000kg海岸线的近岸柔软海底广大区域。海草床一般分布在潮间带和潮下带,有时向下延伸至40m,并经常出现在珊瑚礁和红树林附近。由于具有很高的初级生产力和复杂的栖息环境,海草供养了许多底栖生物和浮游生物。许多鱼类和贝类,包括那些具有商业价值的种类都被吸引到海草栖息地,将海草作为其食物来源和避难场所,特别是在它们的幼年期。分布在西印度洋海草床附近广泛而丰富的鱼类资源就足以说明这一点。这些鱼分别属于天竺鲷科、亚科、玻甲鱼科、银鲈科、虾虎鱼科、隆头鱼科、裸颊鲷科、笛鲷科、单角亚科、鹦嘴鱼科、科、篮子鱼科、海龙科和Teraponidae科。因此,西印度洋地区的海草生态系统无论对当地还是整个地区的渔业发展都是非常有价值的资源。尽管如此,与其他地区相比,该地区有关海草资源的研究还十分缺乏,而且大多数研究也都集中在植物多样性和生态学上。本文主要阐述西印度洋地区海草床研究现状,特别强调鱼类和渔业。目前,该课题的大多数研究主要是在东非海岸开展的,如肯尼亚,坦桑尼亚,莫桑比克以及南非东部地区,而在索马里和西印度洋地区的岛屿国家(塞舌尔、科摩罗、法属留尼旺岛、毛里求斯、马达加斯加等)此类研究却很少,有关海草鱼类生态系统的论文也少有发表,而且大部分都是描述性的。因此,需要通过研究和实验获得有关描述模式和处理方法的科学知识。关于海草鱼类群落的定量研究,类似本文所介绍的案例研究在西印度洋地区是很少的,而这些研究对于渔业的管理前景而言是必不可少的。值得强调的是由于海岸人口的不断增长以及人类活动的侵扰给该地区海草床带来的压力与日俱增,如污染,海水富营养化,沉积作用,捕鱼以及无脊椎动物的采集等活动,而这些活动对于海草床的影响却鲜为人知。因此,需要开展广泛的研究,为西印度洋地区海草生态系统可持续管理提供有用的信息服务。Martin Gullstrm Maricela de la Torre Castro Salomo O.Bandeira Mats Bjrk Mattis Dahlberg Nils Kautsky Patrik Rnnbck Marcus C.hman 章任群 2002AMBIO-人类环境杂志2002,31,7:2
18Aqueous extract of Ocimum tenuiflorum decreases levels of blood glucose in induced hyperglycemic tilapia(Oreochromis niloticus)显示文摘Objective:To evaluate,in hyperglycemic tilapia[Oreochromis niloticus(O.niloticus)].the effect of this aqueous extract on blood glucose levels.Methods:The hyperglycemia in O.niloticus was induced by adding glucose to fish pond water.An aqueous extract of Ocimum tenuiflorum (O.tenuiflorum) was prepared by boiling fresh leaves and the doses of 0,40,80,200 and 400 mg per liter of pond water were tested.Results:The blood sugar concentration for tilapia with hyperglycemic induced was an average of 50%higher than the control group.The blood glucose levels in tilapia after the induction of hyperglycemia were higher than the control group for 90 min after the treatment.The treatment with the aqueous extract of O.tenuiflorum dropped the serum glucose level of hyperglycemic tilapia until it was similar to that of the control group and was dose dependent.Conclusions:The results indicated that O.tenuiflorum was endowed with anti-hyperglycemic activity.To our knowledge,this is the first report on the use of fish as a diabetes model to test natural extracts from plants.Amilcar Arenal Leonardo Martín Nestor M Castillo Dainier de la Torre Ubaldo Torres Reinaldo Gonzlez 2012Asian Pacific Journal of Tropical Medicine2012,5,8:2
19Outcome of HCV/HIV‐Coinfected Liver Transplant Recipients: A Prospective and Multicenter Cohort Study显示文摘J. M. Miro M. Montejo L. Castells A. Rafecas S. Moreno F. Agüero M. Abradelo P. Miralles J. Torre‐Cisneros J. D. Pedreira E. Cordero G. de la Rosa B. Moyano A. Moreno I. Perez A. Rimola 2012American Journal of Transplantation2012,,7:2
20Increased intestinal permeability and tight junction alterations in nonalcoholic fatty liver disease显示文摘Luca Miele Venanzio Valenza Giuseppe La Torre Massimo Montalto Giovanni Cammarota Riccardo Ricci Roberta Mascianà Alessandra Forgione Maria L. Gabrieli Germano Perotti Fabio M. Vecchio Gianlodovico Rapaccini Giovanni Gasbarrini Chris P. Day Antonio Grieco 2009Hepatology2009,,6:2
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