检索结果-南通市图书馆

Endoscopic ultrasound-guided portal pressure gradient identifies patients with previously undiagnosed clinically significant portal hypertension

引用

Portal Hypertension & cirrhosis 2024年第2期3卷 67-74页

作者： Jerome c.Edelson Scott F.D.Edelson John G.Quiles cyrus V.Edelson Eric M.Montminy christian L.Horn John P.Magulick don c.roc.ey Department of Gastroenterology and Hepatology Brooke Army Medical CenterFort Sam HoustonTexasUSA Department of Medicine Uniformed Services University of the Health SciencesBethesdaMarylandUSA Department of Medicine Brooke Army Medical CenterFort Sam HoustonTexasUSA John H.Stroger Jr.Hospital of cook county ChicagoIllinoisUSA Digestive Disease Research center Medical University of South CarolinaCharlestonSouth CarolinaUSA

Aims:Portal hypertension(PH)is a complication of cirrhosis that leads to hepatic *** the portal pressure gradient(PPG)provides valuable information for disease assessment,staging,and *** this study,we aimed to report the utilization of endoscopic ultrasound(EUS)-guided PPG(EUS-PPG)measurements in a real-world ***:This retrospective analysis included patients at a tertiary care center who underwent EUS-PPG between February 2021 and May *** most common indication was to establish or exclude the diagnosis of cirrhosis,followed by an assessment of surgical risk in the setting of suspected *** demographic and clinical data were collected,and statistical analysis was performed using the Student's t ***:Eighteen patients underwent *** success was achieved in 17 of the 18 *** complications were *** mean scores of child-Pugh,Model for End-Stage Liver Disease-Sodium,and Fibrosis-4 scores were 5.1±0.5,9.0±3.0,and 3.7±4.5,*** the 18 patients,two presented with esophageal varices and six with portal hypertensive *** mean PPG was 5.8±4.5 mmHg,and five patients exhibited clinically significant PH(cSPH).Of the 18 patients,15 underwent concurrent EUS-liver biopsy,which was 100%successful and provided diagnostic histology for all *** PPG data led to changes in the clinical management of 17 ***:EUS-PPG is safe and technically *** child-Pugh score did not correlate well with the presence of cSPH;however,PPG measurements resulted in changes in the management of almost all *** studies correlating EUS-PPG with other assessments of liver diseases are required.

关键词： EUS portal hypertension portal pressure gradient

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

The cellular microenvironment and cytoskeletal actin dynamics in liver fibrogenesis

引用

BIOcELL 2022年第9期46卷 2003-2007页

作者： NOUR HIJAZI don c.roc.ey ZENGDUN SHI Medical University of South carolina Charleston29425USA

Hepatic stellate cells(HScs)are the primary effector cells in liver *** the normal liver,HScs serve as the primary vitamin A storage cells in the body and retain a“quiescent”***,after liver injury,they transdifferentiate to an“activated”myofibroblast-like phenotype,which is associated with dramatic upregulation of smooth muscle specific actin and extracellular matrix *** result is a fibrotic,stiff,and dysfunctional ***,understanding the molecular mechanisms that govern HSc function is essential for the development of anti-fibrotic *** actin cytoskeleton has emerged as a key component of the fibrogenic response in wound *** data indicate that the cytoskeleton receives signals from the cellular microenvironment and translates them to cellular function—in particular,increased type I collagen *** in nature,the actin cytoskeleton continuously polymerizes and depolymerizes in response to changes in the cellular *** this viewpoint,we discuss the recent developments underlying cytoskeletal actin dynamics in liver fibrosis,including how the cellular microenvironment affects HSc function and the molecular mechanisms that regulate the actininduced increase in collagen expression typical of activated HScs.

关键词： Extracellular matrix Actin dynamics Transcriptional regulation Signaling

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

The natural history of patients with compensated cirrhosis and elevated hepatic venous pressure gradient

引用

Portal Hypertension & cirrhosis 2022年第2期1卷 101-106页

作者： Andrew Wortham Ali Khalifa don c.roc.ey Digestive Disease Research center Medical University of South CarolinaCharlestonSouth CarolinaUSA

Aims:Portal hypertension is a major complication of liver *** venous pressure gradient(HVPG)appears to be one of the best surrogates of clinical ***,the utility of elevated HVPG in predicting subsequent clinical decompensation is ***:We analyzed 410 patients who underwent HVPG assessment between 2014 and *** these,we identified and analyzed 20 patients with HVPG>12 mmHg without evidence of clinical decompensation(defined as ascites,nonbleeding esophageal varices or bleeding esophageal varices,hepatic encephalopathy,hepatopulmonary syndrome,or hepatic hydrothorax).Additionally,we compared this group to 40 randomly selected cirrhotic patients with HVPG>12 mmHg with signs of clinical *** events were subsequently assessed(mean=33 months)after HVPG ***:Patients with high HVPG without evidence of clinical decompensation had a significantly lower model for end‐stage liver disease(MELD)scores(8±4)compared to decompensated patients(13±8,p=0.05).HVPG measurements were similar in compensated(17±6 mmHg)and decompensated(18±4 mmHg)*** follow‐up for 33 months,8/20 compensated patients had a decompensating event and neither MELD(8 and 8,respectively)nor HVPG(17 and 18 mmHg,respectively)differentiated patients who remained compensated versus those that *** albumin at the time of HVPG measurement was significantly higher in patients who remained compensated than those with a decompensating event(3.5 vs.2.6 g/dl,respectively,p=0.05).conclusions:A small,unique,population of cirrhotic patients with substantially elevated HVPG appear to remain free of complications over long‐term follow‐up.

关键词： child‐Pugh score fibrosis liver disease mortality portal hypertension

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Detection of Alzheimer’s disease onset using MRI and PET neuroimaging:longitudinal data analysis and machine learning

引用

Neural Regeneration Research 2023年第10期18卷 2134-2140页

作者： Iroshan Aberathne don Kulasiri Sandhya Samarasinghe centre for Advanced computational Solutions(c-fAcS) Lincoln UniversityChristchurchNew Zealand

The scientists are dedicated to studying the detection of Alzheimer’s disease onset to find a cure, or at the very least, medication that can slow the progression of the disease. This article explores the effectiveness of longitudinal data analysis, artificial intelligence, and machine learning approaches based on magnetic resonance imaging and positron emission tomography neuroimaging modalities for progression estimation and the detection of Alzheimer’s disease onset. The significance of feature extraction in highly complex neuroimaging data, identification of vulnerable brain regions, and the determination of the threshold values for plaques, tangles, and neurodegeneration of these regions will extensively be evaluated. Developing automated methods to improve the aforementioned research areas would enable specialists to determine the progression of the disease and find the link between the biomarkers and more accurate detection of Alzheimer’s disease onset.

关键词： deep learning image processing linear mixed effect model neuroimaging neuroimaging data sources onset of Alzheimer’s disease detection pattern recognition

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Fundamental Boolean network modelling for childhood acute lymphoblastic leukaemia pathways

引用

Quantitative Biology 2022年第1期10卷 94-121页

作者： Leshi chen don Kulasiri Sandhya Samarasinghe computational Systems Biology Laboratory Centre for Advanced Computational Solutions(C-fACS)Lincoln UniversityLincolnCanterbury 7647New Zealand Integrated Systems Modelling Group Centre for Advanced Computational Solutions(C-fACS)Lincoln UniversityLincolnCanterbury 7647New Zealand

Background:A novel data-driven Boolean model,namely,the fundamental Boolean model(FBM),has been proposed to draw genetic regulatory insights into gene activation,inhibition,and protein decay,published in *** novel Boolean model facilitates the analysis of the activation and inhibition ***,the novel model does not handle the situation well,where genetic regulation might require more time steps to ***:Here,we propose extending the fundamental Boolean modelling to address the issue that some gene regulations might require more time steps to complete than *** denoted this extension model as the temporal fundamental Boolean model(TFBM)and related networks as the temporal fundamental Boolean networks(TFBNs).The leukaemia microarray datasets downloaded from the National centre for Biotechnology Information have been adopted to demonstrate the utility of the proposed TFBM and ***:We developed the TFBNs that contain 285 components and 2775 Boolean rules based on TFBM on the leukaemia microarray datasets,which are in the form of short-time *** data contain gene expression measurements for 13 Gc-sensitive children under therapy for acute lymphoblastic leukaemia,and each sample has three time points:0 hour(before Gc treatment),6/8 hours(after Gc treatment)and 24 hours(after Gc treatment).conclusion:We conclude that the proposed TFBM unlocks their predecessor’s limitation,Le.,FBM,that could help pharmaceutical agents identify any side effects on clinic-related *** hypotheses could be identified by analysing the extracted fundamental Boolean networks and analysing their up-regulatory and down-regulatory pathways.

关键词： Boolean modelling Boolean network time series data network inference data-driven boolean modelling fundamental boolean model fundamental boolean networks orchard cube

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Process development for the direct solvent extraction of nickel and cobalt from nitrate solution:aluminum,cobalt,and nickel separation using cyanex 272

引用

International Journal of Minerals,Metallurgy and Materials 2017年第1期24卷 37-46页

作者： Zela T.Ichlas don c.lbana Leaching and Separation Technologies Group Department of Mining Engineering and Metallurgical EngineeringWA School of MinesCurtin UniversityKalgoorlieWA 6430Australia

A direct solvent extraction（DSX） process for purifying nickel and cobalt from the nitric acid leach solution of nickel laterite ores was conceived and experimentally probed. The proposed process consists of two solvent extraction（SX） steps but with only one extractant - bis（2,4,4-trimethylpentyl）phosphinic acid（cyanex？ 272） - used in both steps. The first extraction step involved the removal of aluminum and zinc, whereas the second extraction step involved the separation of cobalt along with manganese from nickel. The experimental results showed essentially quantitative removal of aluminum（〉97%） and zinc（〉99%） in a single extraction stage using 20vol% cyanex 272 at pH 2.1. Some cobalt（32%） and manganese（55%） were co-extracted but were easily scrubbed out completely from the loaded organic phase using dilute sulfuric acid at pH ≤ 1.38. cobalt and manganese in the first extraction raffinate were extracted completely in four extraction stages at staggered pH values of 4.0, 4.4, 4.5, and 4.0 in the first, second, third, and fourth stages, respectively, using also 20vol% cyanex 272. A small amount of nickel（up to 6.6%） was co-extracted but was easily scrubbed out completely with dilute sulfuric acid at pH 2.0. A flow diagram showing the input and output conditions and the metals separated under the deduced optimum conditions is presented.

关键词： solvent extraction aluminum cobalt nickel nickel laterite ores

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Hg and As Minerals in Fluid Inclusions from the Williams Mine, Hemlo, and Their Genetic Implications

引用

chinese Journal Of Geochemistry 2002年第1期21卷 1-18页

作者：卢焕章 JAYANTA.GUHA don.c.HARRIS Sciences de la Terre Universite du Quebec a chicoutimi chicoutimi Quebec Canada G7H 2B 1 Geological Survey of canada 601 Booth Street Ottawa Ont. Canada K1A 0E8

The Hemlo mineralization is enigmatic compared to general Archean lode gold deposits based on the fact that it is characterized by an exotic mineralogy containing elements such as As, Hg, Sb, Ba, V and Mo. The genetic concepts range from syngenetic to epigenetic types of mineralization. This reconnaissance study was designed to examine the relationship of Hg-As minerals with respect to fluid inclusions in the Williams mine (formerly known as the Page Williams mine) covering the A and c ore zones.

关键词：流体包裹体含汞矿物含砷矿物矿化作用金矿床

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Predisposing factors’effects on mortality of oak (Quercus) and hickory (carya) species in mature forests undergoing mesophication in Appalachian Ohio

引用

Forest Ecosystems 2021年第1期8卷 81-94页

作者： don c.Radcliffe David M.Hix Stephen N.Matthews School of Environment and Natural Resources The Ohio State University2021 Coffey RoadColumbus OH 43210USA School of Environmental and Forest Sciences University of WashingtonBox 352100Seattle WA 98195-2100USA

Background:Mature oak(Quercus spp.)and hickory(carya spp.)trees are gradually being replaced by more shadetolerant tree species across the eastern U.S.,likely due to fire suppression and increased *** and hickories are highly valuable to wildlife;therefore,studying their mortality patterns can provide information on the longevity of habitat quality for many animal *** mortality has most often been studied following large oak decline events,but background mortality rates in forests with aging oak and hickory canopies warrant equal attention,especially in the context of widespread oak and hickory regeneration ***:We studied background mortality rates of five oak and one hickory species over a 23–25 year time period(1993–1995 to 2018),using 821/20th hectare permanent plots on the Marietta Unit of the Wayne National Forest in southeastern *** calculated mortality rates based on remeasurement of individual trees for white oak(Quercus alba),chestnut oak(Quercus montana),northern red oak(Quercus rubra),black oak(Quercus velutina),scarlet oak(Quercus coccinea),and pignut hickory(carya glabra).For each of these species other than scarlet oak,we also modeled the relationships of mortality probability with a priori topographic,soil,stand structural,and individual tree covariates,using a mixed-effects logistic regression ***:The species with the highest mortality rate was scarlet oak(61.3%),followed by northern red oak(41.4%),black oak(26.7%),pignut hickory(23.9%),white oak(23.4%),and chestnut oak(19.1%).In our models,northern red oak mortality was associated with more mesic slope positions,shallower solums,more acidic soils,and older stand *** hickory and chestnut oak mortality rates were associated with higher basal areas on the plot,while white oak mortality showed the opposite ***:Our data suggest that red oak subgenus trees in mature forests of our area will become increasingly uncommon relative t

关键词： Mortality Quercus carya Mesophication Wildlife habitat

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Approximate equivalence in von Neumann algebras

引用

Science china Mathematics 2005年第2期48卷 239-247页

作者： DING Huiru don Hadwin Department of Mathematics University of New HampshireDurhamNH03824USA Department of MathematicsUniversity of New HampshireDurhamNH03824USA

One formulation of D. Voiculescu's theorem on approximate unitary equivalence is that two unital representations π and ρ of a separable c*-algebra are approximately unitarily equivalent if and only if rank o π = rank o ρ. We study the analog when the ranges of π and ρ are contained in a von Neumann algebra R, the unitaries inducing the approximate equivalence must come from R, and "rank" is replaced with "R-rank" (defined as the Murray-von Neumann equivalence of the range projection).

关键词： approximate equivalence, R-rank.

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

What can computational modeling offer for studying the ca^(2+) dysregulation in Alzheimer's disease:current research and future directions

引用

Neural Regeneration Research 2018年第7期13卷 1156-1158页

作者： Jingyi Liang don Kulasiri centre for Advanced computational Solutions(c-fAcS) Lincoln University

ca^2＋ dysregulation is an early event observed in Alzheimer＇s disease（AD） patients preceding the presence of its clinical *** of neuronalca^2＋ will cause synaptic loss and neuronal death,eventually leading to memory impairments and cognitive *** targetingca^2＋ signaling pathways are potential therapeutic strategies against *** complicated interactions make it challenging and expensive to study the underlying mechanisms as to how ca^2＋ signaling contributes to the pathogenesis of *** modeling offers new opportunities to study the signaling pathway and test proposed *** this mini-review,we present some computational approaches that have been used to study ca^2＋ dysregulation of AD by simulating ca^2＋signaling at various *** also pointed out the future directions that computational modeling can be done in studying the ca^2＋ dysregulation in AD.

关键词： Alzheimer's disease amyloid-beta ca^2+ hypothesis ca^2+ dysregulation computational modeling computational neuroscience

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：