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2020篇 您的检索式:作者名="Simoes"
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1Renin-angiotensin system in the pathogenesis of liver fibrosis显示文摘Hepatic fibrosis is considered a common response to many chronic hepatic injuries.It is a multifunctional process that involves several cell types,cytokines,chemokines and growth factors leading to a disruption of homeostatic mechanisms that maintain the liver ecosystem.In spite of many studies regarding the development of fibrosis,the understanding of the pathogenesis remains obscure.The hepatic tissue remodeling process is highly complex,resulting from the balance between collagen degradation and synthesis.Among the many mediators that take part in this process,the components of the Renin angiotensin system(RAS) have progressively assumed an important role.Angiotensin(Ang)□acts as a profibrotic mediator and Ang-(1-7),the newly recognized RAS component,appears to exert a counter-regulatory role in liver tissue.We briefly review the liver fibrosis process and current aspects of the RAS.This review also aims to discuss some experimental evidence regarding the participation of RAS mediators in the pathogenesis of liver fibrosis,focusing on the putative role of the ACE2-Ang-(1-7)-Mas receptor axis.Regina Maria Pereira Robson Augusto Souza dos Santos Filipi Leles da Costa Dias Mauro Martins Teixeira Ana Cristina Simoes e Silva 2009World Journal of Gastroenterology2009,15,21:37
2Current knowledge on esophageal atresia显示文摘Esophageal atresia (EA) with or without tracheoesophageal fistula (TEF) is the most common congenital anomaly of the esophagus. The improvement of survival observed over the previous two decades is multifactorial and largely attributable to advances in neonatal intensive care, neonatal anesthesia, ventilatory and nutritional support, antibiotics, early surgical intervention, surgical materials and techniques. Indeed, mortality is currently limited to those cases with coexisting severe life-threatening anomalies. The diagnosis of EA is most commonly made during the first 24 h of life but may occur either antenatally or may be delayed. The primary surgical correction for EA and TEF is the best option in the absence of severe malformations. There is no ideal replacement for the esophagus and the optimal surgical treatment for patients with long-gap EA is still contro-versial. The primary complications during the postoperative period are leak and stenosis of the anastomosis, gastro-esophageal reflux, esophageal dysmotility, fistula recurrence, respiratory disorders and deformities of the thoracic wall. Data regarding long-term outcomes and follow-ups are limited for patients following EA/TEF repair. The determination of the risk factors for the complicated evolution following EA/TEF repair may positively impact long-term prognoses. Much remains to be studied regarding this condition. This manuscript provides a literature review of the current knowledge regarding EA.Paulo Fernando Martins Pinheiro Ana Cristina Simoes e Silva Regina Maria Pereira 2012World Journal of Gastroenterology2012,18,28:35
3Deep sedation during gastrointestinal endoscopy: Propofol-fentanyl and midazolam-fentanyl regimens显示文摘AIM: To compare deep sedation with propofol-fentanyl and midazolam-fentanyl regimens during upper gastrointestinal endoscopy. METHODS: After obtaining approval of the research ethics committee and informed consent, 200 patients were evaluated and referred for upper gastrointestinal endoscopy. Patients were randomized to receive propofol-fentanyl or midazolam-fentanyl (n = 100/group).We assessed the level of sedation using the observer's assessment of alertness/sedation (OAA/S) score and bispectral index (BIS). We evaluated patient and physician satisfaction, as well as the recovery time and complication rates. The statistical analysis was performed using SPSS statistical software and included the MannWhitney test, χ 2 test, measurement of analysis of variance, and the κ statistic. RESULTS: The times to induction of sedation, recovery, and discharge were shorter in the propofolfentanyl group than the midazolam-fentanyl group. According to the OAA/S score, deep sedation events occurred in 25% of the propofol-fentanyl group and 11% of the midazolam-fentanyl group (P = 0.014). Additionally, deep sedation events occurred in 19% of the propofol-fentanyl group and 7% of the midazolamfentanyl group according to the BIS scale (P = 0.039). There was good concordance between the OAA/S score and BIS for both groups (κ = 0.71 and κ = 0.63, respectively). Oxygen supplementation was required in 42% of the propofol-fentanyl group and 26% of the midazolam-fentanyl group (P = 0.025). The mean time to recovery was 28.82 and 44.13 min in the propofolfentanyl and midazolam-fentanyl groups, respectively (P < 0.001). There were no severe complications in either group. Although patients were equally satisfied with both drug combinations, physicians were more satisfied with the propofol-fentanyl combination. CONCLUSION: Deep sedation occurred with propofolfentanyl and midazolam-fentanyl, but was more frequent in the former. Recovery was faster in the propofol-fentanyl group.Marcos Eduardo Lera dos Santos Fauze Maluf-Filho Dalton Marques Chaves Sergio Eiji Matuguma Edson Ide Gustavo de Oliveira Luz Thiago Ferreira de Souza Fernanda C Simoes Pessorrusso Eduardo Guimares Hourneaux de Moura Paulo Sakai 2013World Journal of Gastroenterology2013,19,22:16
4Renin angiotensin system in liver diseases: Friend or foe?显示文摘In the last three decades,the understanding of the renin angiotensin system(RAS)has been changed by the discoveries of functional local systems,novel biologically active peptides,additional specific receptors,alternative pathways of angiotensin(Ang)?Ⅱ?generation,and new roles for enzymes and precursor components other than those in Ang?Ⅱ?synthesis.In this regard,the discovery that Ang-(1-7)opposes the pressor,proliferative,pro-fibrotic,and pro-inflammatory effects mediated by Ang?Ⅱ?has contributed to the realization that the RAS is composed of two axes.The first axis consists of the angiotensin-converting enzyme(ACE),with Ang?Ⅱ?as the end product,and the angiotensin type 1(AT1)receptor as the main effector mediating the biological actions of Ang?Ⅱ.The second axis results from ACE2-mediated hydrolysis of Ang?Ⅱ,leading to the production of Ang-(1-7),with the Mas receptor as the main effector conveying the vasodilatory,antiproliferative,anti-fibrotic,and anti-inflammatory effects of Ang-(1-7).Experimental and clinical studies have shown that both axes of the RAS may take part in the pathogenesis of liver diseases.In this manuscript,we summarize the current evidence regarding the role of RAS in hepatic cirrhosis and its complications,including hemodynamic changes and hepatorenal syndrome.The therapeutic potential of the modulation of RAS molecules in liver diseases is also discussed.Ana Cristina Simoes e Silva Aline S Miranda Natália P Rocha Antonio L Teixeira 2017World Journal of Gastroenterology2017,23,19:12
5Relationship between angiotensin-(1-7) and angiotensin Ⅱ correlates with hemodynamic changes in human liver cirrhosis显示文摘AIM:To measure circulating angiotensins at different stages ofhuman cirrhosis and to further evaluate a possible relationship between renin angiotensin system (RAS) components and hemodynamic changes.METHODS: Patients were allocated into 4 groups: mild-to-moderate liver disease (MLD), advanced liver disease (ALD), patients undergoing liver transplantation, and healthy controls. Blood was collected to determine plasma renin activity (PRA), angiotensin (Ang) , Ang Ⅱ, and Ang-(1-7) levels using radioimmunoassays. During liver transplantation, hemodynamic parameters were determined and blood was simultaneously obtained from the portal vein and radial artery in order to measure RAS components.RESULTS: PRA and angiotensins were elevated in ALD when compared to MLD and controls (P < 0.05). In contrast, Ang was signicantly reduced in MLD. Ang-(1-7)/Ang Ⅱ ratios were increased in MLD when compared to controls and ALD. During transplantation, Ang Ⅱ levels were lower and Ang-(1-7)/Ang Ⅱ ratios were higher in the splanchnic circulation than in the peripheral circulation (0.52 ± 0.08 vs 0.38 ± 0.04, P < 0.02), whereas the peripheral circulating Ang /Ang ratio was elevated in comparison to splanchnic lev-els (0.18 ± 0.02 vs 0.13 ± 0.02, P < 0.04). Ang-(1-7)/Ang Ⅱ ratios positively correlated with cardiac output (r= 0.66) and negatively correlated with systemic vascular resistance (r =-0.70).CONCLUSION: Our ndings suggest that the relation-ship between Ang-(1-7) and Ang Ⅱmay play a role in the hemodynamic changes ofhuman cirrhosis.Walkíria Wingester Vilas-Boas Antnio Ribeiro-Oliveira Jr Regina Maria Pereira Renata da Cunha Ribeiro Jerusa Almeida Ana Paula Nadu Ana Cristina Simoes e Silva Robson Augusto Souza dos Santos 2009World Journal of Gastroenterology2009,15,20:11
6Developmental pathways associated with cancer metastasis:Notch,Wnt,and Hedgehog显示文摘Master developmental pathways, such as Notch, Wnt, and Hedgehog, are signaling systems that control proliferation, cell death,motility, migration, and stemness. These systems are not only commonly activated in many solid tumors, where they drive or contribute to cancer initiation, but also in primary and metastatic tumor development. The reactivation of developmental pathways in cancer stroma favors the development of cancer stem cells and allows their maintenance, indicating these signaling pathways as particularly attractive targets for efficient anticancer therapies, especially in advanced primary tumors and metastatic cancers. Metastasis is the worst feature of cancer development. This feature results from a cascade of events emerging from the hijacking of epithelial-mesenchymal transition, angiogenesis, migration, and invasion by transforming cells and is associated with poor survival, drug resistance, and tumor relapse. In the present review, we summarize and discuss experimental data suggesting pivotal roles for developmental pathways in cancer development and metastasis, considering the therapeutic potential. Emerging targeted antimetastatic therapies based on Notch, Wnt, and Hedgehog pathways are also discussed.Armel Herve Nwabo Kamdje Paul Takam Kamga Richard Tagne Simo Lorella Vecchio Paul Faustin Seke Etet Jean Marc Muller Giulio Bassi Erique Lukong Raghuveera Kumar Goel Jeremie Mbo Amvene Mauro Krampera 2017Cancer Biology & Medicine2017,14,2:10
7Acute effects of physical exercise in type 2 diabetes: A review显示文摘The literature has shown the efficiency of exercise in the control of type 2 diabetes(T2D), being suggested as one of the best kinds of non-pharmacological treatments for its population. Thus, the scientific production related to this phenomenon has growing exponentially. However, despite its advances, still there is a lack of studies that have carried out a review on the acute effects of physical exercise on metabolic and hemodynamic markers and possible control mechanisms of these indicators in individuals with T2 D, not to mention that in a related way, these themes have been very little studied today. Therefore, the aim of this study was to organize and analyze the current scientific production about the acute effects of physical exercise on metabolic and hemodynamic markers and possible control mechanisms of these indicators in T2 D individuals. For such, a research with the following keywords was performed:-exercise; diabetes and post-exercise hypotension; diabetes and excess post-exercise oxygen consumption; diabetes and acute effects in PUBMED, SCIELO and HIGHWIRE databases. From the analyzed studies, it is possible to conclude that, a single exercise session can promote an increase in the bioavailability of nitric oxide and elicit decreases in postexercise blood pressure. Furthermore, the metabolic stress from physical exercise can increase the oxidation of carbohydrate during the exercise and keep it, in high levels, the post exercise consumption of O2, this phenomenon increases the rate of fat oxidation during recovery periods after exercise, improves glucose tolerance and insulin sensitivity and reduces glycemia between 2-72 h, which seems to be dependent on the exercise intensity and duration of the effort.Ricardo Yukio Asano Marcelo Magalhes Sales Rodrigo Alberto Vieira Browne José Fernando Vila Nova Moraes Hélio José Coelho Júnior Milton Rocha Moraes Hebert Gustavo Simoes 2014World Journal of Diabetes2014,5,5:8
8高速电梯安全钳制动实验分析显示文摘针对高速电梯安全钳制动过程,设计并搭建了高速电梯安全钳制动试验台,目的是通过间接测量制动压强以及制动减速度,得到制动材料的实验摩擦系数。此外,利用红外热像仪拍摄制动区域观察制动材料和制动盘的温升情况。以铜基粉末冶金材料作为制动材料,基于安全钳制动实验得到材料的实验摩擦系数,并研究材料摩擦系数对制动初速度的依赖以及温升特性等。徐青 史熙 Simo Makimallila 2017机械设计与研究2017,33,5:8
9Spectrum of biliary complications following live donor liver transplantation显示文摘Liver transplantation is the optimal treatment for many patients with advanced liver disease, including decompensated cirrhosis, hepatocellular carcinoma and acute liver failure. Organ shortage is the maindeterminant of death on the waiting list and hence living donor liver transplantation(LDLT) assumes importance. Biliary complications are the most common post operative morbidity after LDLT and occur due to anatomical and technical reasons. They include biliary leaks, strictures and cast formation and occur in the recipient as well as the donor. The types of biliary complications after LDLT along with their etiology, presenting features, diagnosis and endoscopic and surgical management are discussed.Priya Simoes Varun Kesar Jawad Ahmad 2015World Journal of Hepatology2015,7,14:7
10Animal models of acute gastric mucosal injury: Macroscopic and microscopic evaluation显示文摘Acute gastric mucosal injury is a common disorder of the gastrointestinal tract and the search for new therapeutics is ongoing. The aim of this study is to update and expand the information related to the most widely used rat models of acute gastric ulcer, the ethanol‐induced ulcer and the indomethacin‐induced ulcer. These two models are compared in terms of macroscopic and microscopic features. Experimentally, ethanol was given orally in a single dose and indomethacin was subcutaneously injected into male Wistar rats. After ulcerative challenges, the stomachs were removed and visually inspected. Anti‐ulcerative drugs were used to validate the models. Histological analysis of the stomachs determined the microscopic score. The methodology used for model evaluation applied to macroscopic and microscopic gastric lesions. With these methods it was possible to induce lesions in the gastric mucosa. Microscopic evaluation permitted assessment of the inflammatory and apoptotic impact in the mucosa not observable by macroscopic evaluation. Groups of animals were treated with two standard drugs: sulcralfate suspension or lansoprazole solution. Both drugs reduced macroscopic and microscopic lesions, particularly the hemorrhagic ones. Both models induced acute gastric mucosal injury and no single evaluation method can address all the aspects of the pathology of gastric lesions. As a complement to macroscopic evaluation, microscopy appears to be a relevant tool to selectively identify specific aspects of the development of mucosal injury, quantify the extent of lesions, and contribute to an appropriate interpretation of results. The score systems established here offer a reliable method for testing antiulcer drugs.Sandra Simoes Rui Lopes Maria Celeste Dias Campos Maria Joao Marruz Maria Eugenia Meirinhos da Cruz Luisa Corvo 2019Animal Models and Experimental Medicine2019,2,2:7
11Bubbly shock propagation as a mechanism of shedding in separated cavitating flows显示文摘Stable attached partial cavitation in separated flows can transition to cloud shedding, and the mechanism of transition has been attributed to the presence of a re-entrant liquid jet. Our findings have revealed the presence of propagating bubbly shock waves as an alternative dominant mechanism of shedding when the compressibility of the bubbly mixture is appreciable. In the present paper, we discuss dynamics associated with these bubbly shock waves, interaction of shock waves with obstacles in their path, and means to manipulate their properties to control the shedding process by non-condensable gas injection.Harish Ganesh Simo A.Makiharju Steven L.Ceccio 2017Journal of Hydrodynamics2017,29,6:5
12非对称型光学交错梳状滤波器显示文摘提出了一种基于Gires-Tournois腔的非对称型光学交错梳状滤波器。理论上,通过调整两个波片的偏振延迟和Gires-Tournois腔的反射率,可以获得任意光谱带宽比的非对称型交错梳状滤波器件。分别对输出带宽比M=1∶3和M=1∶7的非对称型交错梳状滤波器的输出进行了数值模拟,确定两个波片的延迟和Gires-Tournois腔的反射率。分别设计和研制出了输出光谱带宽比M=1∶3和M=1∶7的器件,其中M=1∶3器件的两个输出通道的3 dB带宽分别为0.385 nm和1.161 nm,比值为M=1∶3.02,M=1∶7器件的两个输出通道的3 dB带宽分别为0.191 nm和1.331 nm比值M=1∶6.75。实验结果(光谱带宽比)与设计要求基本符合。伍树东 陈莲 范建强 Simo Cnao 2008光学学报2008,28,1:5
13冷战和环境:芬兰在波罗的海地区国际环境政治方面的角色显示文摘1974年在赫尔辛基签署的关于《波罗的海区域海洋环境保护公约》可能是在波罗的海地区最重要的环境保护协议。本篇文章是首次运用原始档案资料第一次探究本公约的历史,也称之为《赫尔辛基公约》。这些原始资料主要出自芬兰外交部的档案。我们从国际政治角度研究了《赫尔辛基公约》整个签署的过程中芬兰的作用。本研究主要集中在芬兰、瑞典和苏联从20世纪60年代末到1974年的国家政党。我们表明,冷战政治从若干方面影响《赫尔辛基公约》的谈判和内容。我们也认为苏联利用新出现的国际环境问题作为一种新的强权政治的工具。Tuomas Rsnen Simo Laakkonen 翟伟康 2007AMBIO-人类环境杂志2007,36,2:4
14DEM simulation of influence of parameters on energy and degree of mixing显示文摘Powder mixing is being modeled using a simulation based on Newtonian mechanics. Variables under consideration include particle friction and the amplitude, frequency, and direction of shaking. Trajectories for each particle were recorded, and a mixing degree was calculated for each simulation, for which the average energy transferred into the powder system was recorded and compared to the resulting mixing degree. Mixing of particles originally located near the bottom was studied separately, as was the mixing of particles near the surface. This study shows that choosing the proper mixing parameters not only enhances the flnal result of mixing, but also yields good results with less strain on the material mixed and on the mixing device.Simo Siiri Jouko Yliruusi 2011Particuology2011,9,4:4
15Mesenchymal stromal cells' role in tumor microenvironment:involvement of signaling pathways显示文摘Mesenchymal stromal cells(MSCs) are adult multipotent stem cells residing as pericytes in various tissues and organs where they can differentiate into specialized cells to replace dying cells and damaged tissues. These cells are commonly found at injury sites and in tumors that are known to behave like 'wounds that do not heal.' In this article, we discuss the mechanisms of MSCs in migrating, homing, and repairing injured tissues. We also review a number of reports showing that tumor microenvironment triggers plasticity mechanisms in MSCs to induce malignant neoplastic tissue formation, maintenance, and chemoresistance, as well as tumor growth. The antitumor properties and therapeutic potential of MSCs are also discussed.Armel Herve Nwabo Kamdje Paul Takam Kamga Richard Tagne Simo Lorella Vecchio Paul Faustin Seke Etet Jean Marc Muller Giulio Bassi Erique Lukong Raghuveera Kumar Goel Jeremie Mbo Amvene Mauro Krampera 2017Cancer Biology & Medicine2017,14,2:4
16Autoimmune hepatitis in childhood: The role of genetic and immune factors显示文摘Autoimmune hepatitis (AIH) is a rare chronic inflammatory disease of the liver, which affects a group of patients who lost their immunological tolerance to antigens of the liver. It is clinically characterized by hypergammaglobulinemia, elevated liver enzymes, presence of autoantibodies and histological changes. Although being rare in children, it represents a serious cause of chronic hepatic disease that can lead to cirrhosis and hepatic failure. Clinical findings, exclusion of more common liver disorders and the detection of antibodies antinuclear antibodies, smooth muscle antibodies and anti-LKM1 are usually enough for diagnosis on clinical practice. The pathogenic mechanisms that lead to AIH remain obscure, but some research findings suggest the participation of immunologic and genetic factors. It is not yet knew the triggering factor or factors that stimulate inflammatory response. Several mechanisms proposed partially explain the immunologic findings of AIH. The knowledge of immune factors evolved might result in better markers of prognosis and response to treatment. In this review, we aim to evaluate the findings of research about genetic and immune markers and their perspectives of application in clinical practice especially in pediatric population.Priscila Menezes Ferri Liu Débora Marques de Miranda Eleonora Druve Tavares Fagundes Alexandre Rodrigues Ferreira Ana Cristina Simoes e Silva 2013World Journal of Gastroenterology2013,19,28:3
17Physiological Effect of Kinetin on the Photosynthetic Apparatus and Antioxidant Enzymes Activities During Production of Anthurium显示文摘The results observed in the literature raise the hypothesis according to which cytokinin plays important roles in photosynthetic metabolisms and antioxidant enzymes. Thus, the study aimed to evaluate the effect of foliar application of the isolated cytokinin kinetin at the production cycle, seeking to analyze its effects on enzyme activity and photosynthetic parameters. The plants treated with CK presented reduction of leaf CO_2 assimilation rate(Pn) and stomatal conductance(Gs), while that transpiration rate(Tr) was unaffected. The internal CO_2 concentrations decreased with the increase in cytokinin levels, but were maintained under CK 50 mg·L^(-1). The plants treated with CK 75 mg·L^(-1) was verified higher carboxylation efficiency(Pn/Ci), which was associated to values of CO_2 assimilation and transpiration unaltered. Apparent electron transport rate showed variations in the concentration of 25 mg·L^(-1). Considering the study of enzyme activity, on the other hand, it cannot be stated that kinetin has an effective action in delaying oxidative damage. It presents mixed results, since an efficiency in the application of cytokinin was not observed, presenting induction levels of ascorbate peroxidase activity. Thus, further research is needed to determine more precisely the effects of kinetin on gas exchange and antioxidant enzymes in anthurium plants.de MOURA Fabiana B. VIEIRA Marcos R. da S. SIMOES Adriano do N. FERREIRA-SILVA Sérgio L. de SOUZA Carlos A.V. de SOUZA Eduardo S. da ROCHA Alexandre T. da SILVA Luzia F. JUNIOR Miguel A. 2018Horticultural Plant Journal2018,4,5:3
18The 4700 aB.P. volcanic signal detected in Vostok BH8 ice core, Antarctica显示文摘The detailed electrical conductivity measure- ment (ECM), trace chemical compositions and microparti- cles concentration analysis are performed for BH8 ice core from the depth of 126.0m to 130.0m at Vostok Station. At depth 128.7m, a volcanic signal 4726 a B.P. is detected. The volcanic sulphate flux is 95.8 kg·km?2, sulphate peak concen- tration 1352.8 ng·g?1, duration time about 10.1 years, com- parable with some well-known volcanic events. The results indicate that it seems to be a relatively large scale, long last- ing volcanic signal with farther volcanic origin.LIU Leibao KANG Jiancheng Jean R. Petit Jefferson C. Simoes Martine De Angelis 2005Chinese Science Bulletin2005,50,22:2
19太阳能电梯的研究与开发显示文摘针对老楼加装电梯改造工程中面临的配电线路可能短时超载、建设与运行费用分摊协调困难等问题,研究光伏+储能的太阳能电梯系统方案,开发对原电梯控制系统无任何影响的太阳能电梯控制器,实现光伏优先、电网补充的双电源供电模式。光伏阵列对配套的蓄电池充电,提供电梯运行所需的电能;在电梯运行过程中,蓄电池既能及时提供大功率驱动电能消除对配电线路的冲击,又能高效吸收回馈电能降低系统的能耗,并且保证停电时电梯的正常运行。实验结果表明,光伏发电效率高,电机驱动与能量回馈动态特性良好,电梯运行平稳。徐政 李旭 李博 Makimattila Simo 2020太阳能学报2020,41,7:2
20Endoscopic advances in the management of gastric cancer and premalignant gastric conditions显示文摘Gastric cancer is the fifth most common cancer and in 2018,it was the third most common cause of cancer-related deaths worldwide.Endoscopic advances continue to be made for the diagnosis and management of both early gastric cancer and premalignant gastric conditions.In this review,we discuss the epidemiology and risk factors of gastric cancer and emphasize the differences in early vs latestage gastric cancer outcomes.We then discuss endoscopic advances in the diagnosis of early gastric cancer and premalignant gastric lesions.This includes the implementation of different imaging modalities such as narrow-band imaging,chromoendoscopy,confocal laser endomicroscopy,and other experimental techniques.We also discuss the use of endoscopic ultrasound in the diagnosis and staging of early gastric cancer.We then discuss the endoscopic advances made in the treatment of these conditions,including endoscopic mucosal resection,endoscopic submucosal dissection,and hybrid techniques such as laparoscopic endoscopic cooperative surgery.Finally,we comment on the current suggested recommendations for surveillance of both gastric cancer and its premalignant conditions.Erica Park Makoto Nishimura Priya Simoes 2023World Journal of Gastrointestinal Endoscopy2023,15,3:2
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