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Carbon dioxide induced degradation of diethanolamine during absorption and desorption processes

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Chinese Journal of Chemical Engineering 2018年第2期26卷 293-302页

作者： md.Sakinul Islam Kotaiah Naik Dhanavath Nhol Kao Pradipto K.Bhattacharjee Brahim si Ali Rozita Yusoff Department of Chemical Engineering School of EngineeringRMIT UniversityMelbourneVIC 3001Australia Department of Chemical Engineering Faculty of EngineeringUniversity of Malaya50603 Kuala LumpurMalaysia

Alkanolamines are widely used in the purification of the sourgas sweetening process. During the sour gas absorption process, CO_2 significantly degrades the amine solvent and creates enormous problems for plant operation. In this work, CO_2 induced degradation of aqueous diethanolamine(DEA) solution was conducted in a 1.25 L jacketed glass reactor that functioned as an absorber and stripper at atmospheric conditions. Pure CO_2 was bubbled through the reactor until the solution became saturated. In this study, the concentrations of DEA used were in the range of concentrations between 2 mol·L^(-1) and 4 mol·L^(-1). In the degradation experiment, six generic cycles were conducted for each run. Each cycle was configured with the absorption and desorption of carbon dioxide at 55 ℃ and 100 ℃, respectively. Samples were collected after a predetermined experimental time and analyzed by ion chromatography(IC) to identify unknown ionic degradation products(DGPs). In the IC analysis, three different columns were used for anion, cation and ion exclusion systems, which are Metrosep A Supp 5150/4.0, Metrosep C Supp 4 150/4.0 and Metrosep Organic Acids, respectively. The major identified DGPs of D01 DEA2 M, D02 DEA3 M, and D03 DEA4 M are nitrite, acetate and ammonium. Phosphate product was found in the degraded amine samples which might be due to the contamination of water or chromatographic system.

关键词： Degradation Diethanolamine Absorption Stripping Gas sweetening process

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通过炎性因子曲线探讨血液透析的临床预后

罕少疾病杂志 2025年第1期32卷 156-158页

作者：徐思涵南阳医学高等专科学校第一附属医院检验科河南南阳473000

目的通过炎性因子[白细胞介素-6(IL-6)、C反应蛋白(CRP)、降钙素原(Pct)]曲线探讨血液透析的临床预后。方法采取回顾性研究,选择2023年1月至2023年12月医院收治120例完成1年随访的MHD患者作为研究对象。根据患者预后情况,将随访1年内... 详细信息

目的通过炎性因子[白细胞介素-6(IL-6)、C反应蛋白(CRP)、降钙素原(Pct)]曲线探讨血液透析的临床预后。方法采取回顾性研究,选择2023年1月至2023年12月医院收治120例完成1年随访的MHD患者作为研究对象。根据患者预后情况,将随访1年内病死患者纳入预后不良组(n=31),将存活患者纳入预后良好组(n=89)。统计并比较两组基线资料、炎症因子(IL-6、CRP、Pct)水平;采用Cox回归分析检验影响MHD患者预后不良的的影响因素;采用受试者工作特征曲线(ROC)曲线预测血清IL-6、CRP及Pct水平对MHD患者预后不良的预测价值;采用R4.1.3统计学软件,绘制血清IL-6、CRP及Pct水平预测MHD患者预后不良的决策曲线。结果预后不良组透析龄长于预后良好组,营养不良占比高于预后良好组,血清IL-6、CRP及Pct水平高于预后良好组(P1,P0.70,具有一定的预测价值,且三者联合预测价值最高;绘制决策曲线,结果显示,在阈值0.000~0.446、0.658~1.000范围内,血清IL-6、CRP、Pct水平联合预测MHD患者预后不良净收益率优于单独的净收益率。结论血清IL-6、CRP及Pct水平是MHD患者预后不良的独立危险因素,联合检测预测效能最高,可用于预测MHD患者预后。

关键词：维持性血液透析预后白细胞介素-6 C反应蛋白降钙素原

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Statistical data driven approach of COVID-19 in Ecuador: R_(0) and R_(t) estimation via new method

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Infectious Disease Modelling 2021年第1期6卷 232-243页

作者： raúl Patricio Fernandez-Naranjo MSc Eduardo Vasconez-Gonzalez md Katherine simbana-Riveramd,MSc Lenin Gomez-Barreno md Juan S.Izquierdo-Condoy md Domenica Cevallos-Robalinomd,MPH(c) Esteban Ortiz-Prado md,MSc,MPH One Health Research Group Faculty of MedicineUniversidad de las AmericasQuitoEcuador Resident of Intensive Care Unit Hospital Quito Sur IESSQuitoEcuador

The growth of COVID-19 pandemic throughout more than 213 countries around the world have put a lot of pressures on governments and health services to try to stop the rapid expansion of the *** 2009,H1N1 Influenza pandemic,statistical and mathematical methods were used to track how the virus spreads around *** of these models that were developed at the beginning of the XXI century are based on the classical susceptible-infected-recovered(siR)model developed almost a hundred years *** evolution of this model allows us to forecast and compute basic and effective reproduction numbers(R_(t) and R_(0)),measures that quantify the epidemic potential of a pathogen and estimates different *** this study,we present a traditional estimation technique for R_(0) with statistical distributions by best fitting and a Bayesian approach based on continuous feed of prior distributions to obtain posterior distributions and computing real time R_(t).We use data from COVID-19 officially reported cases in Ecuador since the first confirmed case on February *** of the lack of data,in the case of R_(0) we compare two methods for the estimation of these parameters below exponential growth and maximum likelihood *** do not make any assumption about the evolution of cases due to limited information and we use previous methods to compare scenarios about R_(0) and in the case of R_(t) we used Bayesian inference to model uncertainty in contagious proposing a new modification to the well-known model of Bettencourt and Ribeiro based on a time window of m days to improve *** R_(0) with exponential growth criteria was 3.45 and with the maximum likelihood estimation method was *** results show that Guayas,Pichincha and Manabíwere the provinces with the highest number of cases due to *** reasons explain the increased transmissibility in these localities:massive events,population density,cities dispersion patterns,and

关键词： Bayesian inference R0 COVID-19 Real time reproduction factor Basic reproduction factor Ecuador

Relationship between diversion colitis and quality of life in rectal cancer

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World Journal of Gastroenterology 2013年第4期19卷 542-549页

作者： Dong Nyoung Son Dong Jin Choi si Uk Woo Jin Kim Bo ra Keom Chul Hwan Kim Se Jin Baek Seon Hahn Kim Colorectal Division Department of SurgeryKorea University Anam Hospital Korea University College of Medicine Seoul 136-705South Korea Department of Surgery Sun General HospitalDaejeon 301-747South Korea Department of Surgery Gangseo Song-do HospitalSeoul 139-711South Korea Department of Gastroenterology Korea University Anam Hospital Department of Pathology Korea University Anam Hospital

AIM:To investigated the incidence of diversion colitis(DC) and impact of DC symptoms on quality of life(QoL) after ileostomy reversal in rectal ***:We performed a prospective study with 30 patients who underwent low anterior resection and the creation of a temporary ileostomy for the rectal cancer between January 2008 and July 2009 at the Department of Surgery,Korea University Anam *** participants totally underwent two rounds of the *** first examination,endoscopies,tissue biopsies,and questionnaire survey about the symptom were performed 3-4 mo after the ileostomy *** second examination,endoscopies,tissue biopsies,and questionnaire survey about the symptom and QoL were performed 5-6 mo after the ileostomy *** data were based on the histopathological reports and clinical records of the ***:At the first examination,all of the patients presented with inflammation,which was mild in 15(50%) patients,moderate in 11(36.7%) and severe in 4(13.3%) by endoscopy and mild in 14(46.7%) and moderate in 16(53.3%) by *** the second examination,only 11(36.7%) and 17(56.7%) patients had mild inflammation by endoscopy and histology,*** was no significant difference in DC grade between the endoscopic and the histological findings at first or second *** symptoms detected on the first and second questionnaires were mucous discharge in 12(40%) and 5(17%) patients,bloody discharge in 5(17%) and 3(10%) patients,abdominal pain in 4(13%) and 2(7%) patients and tenesmus in 9(30%) and 5(17%) patients,*** found no correlation between the endoscopic or histological findings and the symptoms such as mucous discharge,bleeding,abdominal pain and tenesmus in both time *** was detected in 9 patients at the second examination;this number correlated with the severity of DC(0%,0%,66.7%,33.3% vs 0%,71.4%,23.8%,4.8%,P = 0.001) and the symptom-related QoL(r =-0.791,P

关键词： Diversion colitis Quality of life Diarrhea Ileostomy Rectal cancer

Antitumor activity of Aponogeton undulatus against Ehrilich ascites carcinoma in Swiss albino mice

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Asian Pacific Journal of Tropical Medicine 2015年第6期8卷 431-438页

作者： md Reyazul Islam md BadrulAlam UmmeTamima Shayla Islam Jenny Department of Bioactive Materials Science Chonbuk National University567Baekje-daeroDeokjin-guJeonju-siJeollabuk-doRepublic of Korea Graduate School of Food Science & Biotechnology Kyungpook National University 80Daehak-raBuk-guDaeguRepublic of Korea Department of Pharmacy Atishlipankar University of Science & Technology College of Pharmacy Seoul National UniversityI Guanak-roGuanak-guSeoulRepublic of Korea

Objective:To investigate in vitro antioxidant and in vivo antitumor activity of the crude methanolic extract of Aponogeton undulatus(MAU) along with its various organic ***:Aponogeton undulatus leaves were successively extracted using methanol(MAU)and then fractionated by chloroform,ethyl acetate(EAU) and *** total antioxidant capacity,lipid peroxidation inhibition assay.1.1-diphenyl-2-picrylhydrazyl(DPPH) free radical scavenging assay and ferrous reducing power assessment were used to evaluate the antioxidant potential of the crude extract and its organic *** in vivo antitumor activity is evaluated against Ehrlich ascites carcinoma(EAC) cell bearing in Swiss albino ***:EAU showed the highest antioxidant capacity as(175.80±0.41)mg/g,IC_(50)value of DPPH scavenging activity was(38.84±0.02)μg/mL and also exhibited maximum lipid peroxidation inhibition activity with the IC_(50) value of(42.52±0.32)μg/mL than other *** results demonstrate that reducing power of the extract was concentration *** addition,EAU was administered at 50.100 and 200 mg/kg body weight respectively to EAC cell bearing mice and a significant(Psignificant and confirmed that the Aponogeton undulatus has remarkable antitumor activity with antioxidant potential.

关键词： Antioxidant Antitumor Ehrlich ascites carcinoma Aponogeton undulatus

An immunological storm for cancer therapy: 2018 Nobel Prize in Physiology or Medicine

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Science Bulletin 2018年第24期63卷 1608-1610页

作者： si-Yang Liu Yi-Long Wu Guangdong General Hospital School of MedicineSouth China University of Technology

Immunotherapy with checkpoint inhibitors (CPIs)is a new approach to cancer therapy that harnesses and enhances the innate abilities of the immune system to recognize and fight *** has become a breakthrough in the history of cancer treatment and is of epoch-making significance [1 ]. In the past century,Nobel Prize has been awarded to the advances in immunology for 15 *** year,it won for the 16th *** *** from the University of Texas md Anderson Cancer Center and Japanese immunologist Tasuku Honjo were awarded the 2018 Nobel Prize in Physiology or Medicine,for their great contributions to the discovery of the CTLA-4 and PD-1 and the development of promising cancer therapy by inhibition of negative immune *** research shows how different strategies to inhibit the brakes on the immune system can be used in the treatment of cancer,which became a landmark in the history of cancer therapy.

关键词： Immunotherapy checkpoint inhibitors cancer

Progress in ab initio in-medium similarity renormalization group and coupled-channel method with coupling to the continuum

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Nuclear Science and Techniques 2024年第12期35卷 312-342页

作者： Xin‑Yu Xu si‑Qin Fan Qi Yuan Bai‑Shan Hu Jian‑Guo Li si‑Min Wang Fu‑Rong Xu School of Physics and State Key Laboratory of Nuclear Physics and TechnologyPeking UniversityBeijing 100871China Southern Center for Nuclear‑Science Theory(SCNT)Institute of Modern Physics Chinese Academy of SciencesHuizhou 516000China National Center for Computational Sciences Oak Ridge National LaboratoryOak RidgeTN 37831USA Physics Division Oak Ridge National LaboratoryOak RidgeTN 37831USA Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000China Institute of Modern Physics Key Laboratory of Nuclear Physics and Ion‑beam Application(MOE) Fudan UniversityShanghai 200433China Shanghai Research Center for Theoretical Nuclear Physics NSFC and Fudan UniversityShanghai 200438China

Over the last decade,nuclear theory has made dramatic progress in few-body and ab initio many-body *** great advances stem from chiral efective feld theory(xEFT),which provides an efcient expansion and consistent treatment of nuclear forces as inputs of modern many-body calculations,among which the in-medium similarity renormalization group(IMSRG)and its variants play a vital *** the other hand,signifcant eforts have been made to provide a unifed description of the structure,decay,and reactions of the nuclei as open quantum *** a fully comprehensive and microscopic model has yet to be realized,substantial progress over recent decades has enhanced our understanding of open quantum systems around the dripline,which are often characterized by exotic structures and decay *** study these interesting phenomena,Gamow coupled-channel(GCC)method,in which the open quantum nature of few-body valence nucleons coupled to a deformed core,has been *** review focuses on the developments of the advanced IMSRG and GCC and their applications to nuclear structure and reactions.

关键词： Ab initio calculations Chiral efective feld theory In-medium similarity renormalization group Gamow coupled channel Resonance and continuum Open quantum systems

Ecological fitness of brown planthopper, Nilaparvata lugens (Stål), to rice nutrient management

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Ecological Processes 2017年第1期6卷 149-158页

作者： md.Mamunur rashid Mahbuba Jahan Khandakar S.Islam md.Abdul Latif Plant Physiology Division Bangladesh Rice Research Institute(BRRI)Gazipur 1701Bangladesh Department of Entomology Bangladesh Agricultural UniversityMymensingh 2202Bangladesh Plant Pathology Division Bangladesh Rice Research Institute(BRRI)Gazipur 1701Bangladesh

Introduction:The brown planthopper(BPH),Nilaparvata lugens(Stål)(Hemiptera:Delphacidae),is a notorious insect pest of *** supplementation can alter plant biochemical compositions which may indirectly affect on ecological fitness parameters of its insect ***,few findings are available on nutrient-induced ecological fitness of BPH and relationship of BPH fitness parameters with its host rice plant biochemical ***:We studied the main and interaction effects of nitrogen(N),phosphorus(P),and potassium(K)inputs on BPH fitness,as measured by the following variables:nymph survival,nymphal duration,adult body weight,and its *** planthopper fitness parameters were regressed as function of rice plant(Oryza sativa)biochemical composition.A completely randomized design with four replications in a factorial scheme was used considering N,P,and K levels as ***:Nitrogen application to the host rice plants provided greater survival and enhanced body weight of *** nymphal duration was found to decrease with N subsidy that caused shorter generation time of *** compounds N and soluble protein(SP),total free sugar(TFS),and silicon(si)content in rice plant tissue correlated strongly with all fitness traits of ***,SP,and TFS associated positively with BPH survival and body weight,while negatively with nymphal *** contrast,si had negative correlation with BPH survival and body weight,but positive with nymphal *** supplementation to host plant contributed to increase BPH body *** of P with all parameters of BPH were weak except body weight which was highly significant and *** between N and P inputs demonstrated significant effect on BPH body *** of K had no significant effect on BPH survival and *** analysis did not detect significant relationship of BPH fitness parameters with plant tissue content of ***:The res

关键词： Nilaparvata lugens Nutrient management Survival Nymphal duration Body weight

Ion specificity in NaCl solution confined in silicon nanochannels

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Science China(Technological Sciences) 2014年第1期57卷 230-238页

作者： QIU YingHua TAN QiYan si Wei CHEN YunFei School of Mechanical Engineering and Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments Southeast University

Ion specificity of Na＋ and C1- ions for NaCI solution confined in silicon nanochannels is investigated with molecular dynamics （md） simulations. The md simulation results demonstrate that ion specificity for Na＋ and C1- ions exhibits clearly in na- nochannels with high surface charge density. The two types of ions show different density distributions perpendicular to the channel surface due to the ion specificity when they act as countefions near negatively and positively charged surfaces, respec- tively. Both the two counterion distributions cannot be predicted by Poisson-Boltzmann equation within 0.75 nm near the sur- face. In addition, the ion specificity is also demonstrated through affecting the water density distributions. In the nanochannel with negatively charged surfaces, the presence of the Na＋ ions reduces the number of water peaks in water density distribution profile. In comparison, when the C1- ions act as counterions near positively charged surfaces, they do not affect the number of the water peaks. Besides the influence on the water density distribution, ion specificity also exhibits through affecting the wa- ter molecule orientation in the adsorbed layer. It is found that C1- ions make the water molecules in the adsorbed layer align more orderly than Na~ ions do when the two types of ions act as the counterions near the positively and negatively charged surfaces with the same surface charge density.

关键词： ion specificity molecular dynamics simulations nanochannel Poisson-Boltzmann equation electrical double layer