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Synthesis of carbon nitride in potassium hydroxide molten salt for efficient uranium extraction from radioactive wastewater

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Frontiers of Environmental Science & Engineering 2024年第8期18卷 89-99页

作者： Shuang Liu Junhan Luo Daniel-james Maguire Liyuan Zheng Zhe Wang Yuexiang Lu Institute of Nuclear and New Energy Technology Tsinghua UniversityBeijing 100084China Nuclear Research Institute for Future Technology and Policy Seoul National UniversitySeoul 08826Republic of Korea Department of Earth Sciences University of CambridgeCambridge CB23EQUK The MOE Key Laboratory of Resources and Environmental System Optimization College of Environmental Science and EngineeringNorth China Electric Power UniversityBeijing 102206China

Photocatalysis-assisted removal of uranium has been proven as an effective method for the elimination of radioactive pollution from *** this work,carbon nitride materials were synthesized in potassium hydroxide(KOh)molten salt and applied to photocatalytic uranyl *** materials were confirmed to possess the triazine-s-heptazine structure by NMR,XPS and UV-Vis characterization,and exhibited a wider visible light absorption than graphitic carbon nitride(g-C_(3)N_(4)).The photocatalytic activity of the carbon nitride materials was tailored by varying the precursor mass *** carbon nitride obtained at 80%melamine as precursor(K-CN-80)exhibited the highest photocatalytic extraction ability and its photocatalytic reaction rate is 6.6 times faster than that of g-C_(3)N_(4).The influence of sacrificial agents was studied and the results showed that triethanolamine inhibited U(Ⅵ)photoreduction,but methanol can accelerate U(Ⅵ)photoreduction by consuming photogenerated *** unary KOh molten salt synthesis method has exceptional potential applications in the preparation of carbon nitrides,and the obtained products showed potential in extracting U(Ⅵ)from aqueous solutions for use in nuclear fuel industry and for U(Ⅵ)environmental pollution cleanup.

关键词： Uranium Carbon nitride Molten salt Photocatalysis Radioactive wastewater

Facilitated Prediction of Micropollutant Degradation via UV-AOPs in Various Waters by Combining Model Simulation and Portable Measurement

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Engineering 2024年第6期37卷 87-95页

作者： Yanyan huang Mengkai Li Zhe Sun Wentao Li james R.Bolton Zhimin Qiang Key Laboratory of Drinking Water Science and Technology Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China University of Chinese Academy of Sciences Beijing 100049China Department of Civil and Environmental Engineering University of AlbertaEdmontonAB T6G 1H9Canada State Key Laboratory of Environmental Aquatic Chemistry Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China

The degradation of micropollutants in water via ultraviolet(UV)-based advanced oxidation processes(AOPs)is strongly dependent on the water *** reactive radicals(RRs)formed in UV-AOPs have different reaction selectivities toward water matrices and degradation efficiencies for target ***,process selection and optimization are *** study developed a facilitated prediction method for the photon fluence-based rate constant for micropollutant degradation(K′_(p,MP))in various UV-AOPs by combining model simulation with portable *** methods for measuring the scavenging capacities of the principal RRs(RRSCs)involved in UV-AOPs(i.e.,hO^(·),SO_(4)^(·-),and Cl^(·))using a mini-fluidic photoreaction system were *** simulation models consisted of photochemical,quantitative structure–activity relationship,and radical concentration steady-state approximation *** RRSCs were determined in eight test waters,and a higher RRSC was found to be associated with a more complex water ***,by taking sulfamethazine,caffeine,and carbamazepine as model micropollutants,the k′_(p,MP) values in various UV-AOPs were predicted and further verified experimentally.A lower k′_(p,MP) was found to be associated with a higher RRSC for a stronger RR competition;for example,k′_(p,MP) values of 130.9 and 332.5 m^(2) einstein^(–1),respectively,were obtained for carbamazepine degradation by UV/h_(2)O_(2) in the raw water(RRSC=9.47×10^(4) s^(-1))and sand-filtered effluent(RRSC=2.87×10^(4) s^(-1))of a drinking water treatment *** developed method facilitates process selection and optimization for UV-AOPs,which is essential for increasing the efficiency and cost-effectiveness of water treatment.

关键词： UV-AOPs Micropollutant degradation Reactive radicals Water matrix Model simulation

Evaluating reservoir suitability for large-scale hydrogen storage:A preliminary assessment considering reservoir properties

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Energy Geoscience 2024年第4期5卷 198-211页

作者： Chinedu J.Okere james J.Sheng Chinedu Ejike Bob L.herd Department of Petroleum Engineering Texas Tech UniversityLubbockTX79409United States Mewbourne School of Petroleum and Geological Engineering University of OklahomaOK73019United States

With rising demand for clean energy,global focus turns to finding ideal sites for large-scale underground hydrogen storage(UhS)in depleted petroleum reservoirs.A thorough preliminary reservoir evaluation before hydrogen(h_(2))injection is crucial for UhS success and *** criteria for UhS often emphasize economics and chemistry,neglecting key reservoir *** study introduces a comprehensive framework for the reservoir-scale preliminary assessment,specifically tailored for long-term h_(2) storage within depleted gas *** evaluation criteria encompass critical components,including reservoir geometry,petrophysical properties,tectonics,and formation *** illustrate the practical application of this approach,we assess the Barnett shale play reservoir *** assessment unfolds through three key stages:(1)A systematic evaluation of the reservoir's properties against our comprehensive screening criteria determines its suitability for h_(2) storage.(2)Using both homogeneous and multilayered gas reservoir models,we explore the feasibility and efficiency of h_(2) *** phase involves an in-depth examination of reservoir behavior during the injection stage.(3)To enhance understanding of UhS performance,sensitivity analyses investigate the impact of varying reservoir dimensions and injection/production *** findings reveal the following:(a)Despite potential challenges associated with reservoir compaction and aquifer support,the reservoir exhibits substantial promise as an h_(2) storage site.(b)Notably,a pronounced increase in reservoir pressure manifests during the injection stage,particularly in homogeneous reservoirs.(c)Furthermore,optimizing injection-extraction cycle efficiency can be achieved by augmenting reservoir dimensions while maintaining a consistent *** ensure a smooth transition to implementation,further comprehensive investigations are advised,including experimental and numerical studies to address

关键词： Site selection Underground hydrogen storage Preliminary evaluation Depleted petroleum reservoirs Reservoir assessment

Noninvasive scores for the prediction of esophageal varices and risk stratification in patients with cirrhosis

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World Journal of hepatology 2020年第11期12卷 908-918页

作者： Saroja Bangaru Jihane N Benhammou james h.tabibian Internal Medicine GastroenterologyUniversity of California at Los AngelesLos AngelesCA 90025United States The Vatche and Tamar Manoukian Division of Digestive Diseases University of California at Los AngelesLos AngelesCA 90095United States Department of Medicine Olive View-University of California at Los Angeles Medical CenterSylmarCA 91342United States David Geffen School of Medicine at UCLA Los AngelesCA 90095United States

The primary purpose of variceal screening in patients with cirrhosis is to detect gastroesophageal varices at high risk of hemorrhage and implement preventative intervention(s).It was previously recommended that all patients with cirrhosis undergo initial and periodic longitudinal variceal screening via upper ***,there has been growing interest and methods to identify patients with cirrhosis who may not have clinically significant portal hypertension and therefore be unlikely to have varices requiring intervention or benefit from upper *** the population of patients with compensated advanced chronic liver disease continues to grow,it is neither beneficial nor cost-effective to perform endoscopic variceal screening in all ***,there is ongoing research into the development of methods to non-invasively risk stratify patients with cirrhosis for the presence of high-risk esophageal varices and effectively limit the population that undergoes endoscopic variceal *** is particularly important and timely in light of increasing healthcare reform and barriers to *** this review,we discuss and compare,with respect to test characteristics and clinical applicability,the available methods used to noninvasively predict the presence of esophageal varices.

关键词： Gastroesophageal varices Variceal screening Advanced chronic liver disease Cirrhosis Non-invasive screening Upper endoscopy

Protective effects of cyclosporine and its analog NIM-811 in a murine model of hepatic ischemia-reperfusion injury

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Liver Research 2024年第1期8卷 46-53页

作者： Joshua hefler Rena Pawlick Braulio A.Marfil-Garza Aducio Thiesen Nerea Cuesta-Gomez Sanaz hatami Darren h.Freed Constantine Karvellas David L.Bigam A.M.james Shapiro Department of Surgery Faculty of Medicine&DentistryUniversity of AlbertaEdmontonABCanada Department of Medicine Faculty of Medicine&DentistryUniversity of AlbertaEdmontonABCanada ChRISTUS-LatAm hub Excellence&Innovation Center MonterreyMexico Alberta Diabetes Institute University of AlbertaEdmontonABCanada Clinical Islet Transplant Program University of AlbertaEdmontonABCanada Department of Laboratory Medicine&Pathology Faculty of Medicine&DentistryUniversity of AlbertaEdmontonABCanada

Background and aim:The liver is susceptible to ischemia-reperfusion injury(IRI)during hepatic surgery,when the vessels are compressed to control bleeding,or liver transplantation,when there is an obligate period of *** hallmark of IRI comprises mitochondrial dysfunction,which generates reactive oxygen species,and cell death through necrosis or ***(CsA),which is a well-known immunosuppressive agent that inhibits calcineurin,has the additional effect of inhibiting the mito-chondrial permeability transition pore(mPTP),thereby,preventing mitochondrial swelling and ***-811,which is the nonimmunosuppressive analog of CsA,has a similar effect on the *** this study,we tested the effect of both agents on mitigating warm hepatic IRI in a murine *** and methods:Before ischemic insult,the mice were administered with intraperitoneal normal saline(control);CsA at 2.5,10,or 25 mg/kg;or NIM-811 at 10 mg/***,the mice were subjected to partial warm hepatic ischemia by selective pedicle clamping for 60 min,followed by 6 h of recovery after *** alanine transaminase(ALT)was measured,and the liver tissue was examined histologically for the presence of apoptosis and the levels of inflammatory ***:Compared with the control mice,the mice treated with 10 and 25 mg/kg of CsA and NIM-811 had significantly lower ALT levels(Phe liver tissue showed reduced histological injury scores after treatment with CsA at 2.5,10,and 25 mg/kg and NIM-811(P=0.041,h CsA at all doses(P=0.012,0.007,andhe pro-inflammatory cyto-kines,particularly interleukin(IL)-1β,IL-2,IL-4,IL-10,and keratinocyte chemoattractant/human growth-regulated oncogene significantly decreased in the mice treated with the highest dose of CsA(25 mg/kg)than those in the control ***

关键词： Cyclosporine(CsA) Cyclosporine analogue Liver surgery Ischemia-reperfusion injury(IRI) Animal model NIM-811

Gastro-gastric intussusception in the setting of a neuroendocrine tumor: A case report

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World Journal of Clinical Cases 2019年第21期7卷 3517-3523页

作者： Alex Zhornitskiy Long Le Serene Tareen Gezman Abdullahi Deepthi Karunasiri james h.tabibian Department of Internal Medicine Olive View-UCLA Medical CenterSylmarCA 91342United States Department of Pathology and Laboratory Medicine Olive View-UCLA Medical CenterSylmarCA 91342United States Division of Gastroenterology Department of MedicineOlive View-UCLA Medical CenterSylmarCA 91342United States

BACKGROUND While in children intussusception is often idiopathic,in adults it is commonly caused by a pathologic condition functioning as a lead *** is important to note that a variety of pathologic conditions may trigger intussusception,with malignancy being a relatively frequent culprit in adults;this should be considered high on the differential diagnosis during *** SUMMARY This is a case of a 40-year-old female presenting to the emergency department(ED)with three days of acute on chronic,peri-umbilical abdominal pain described as waxing and waning,and pressure-like in *** computed tomography(CT)of the abdomen and pelvis with contrast in the ED(after her pain had resolved)re-demonstrated a previously noted 13 mm lesion in the gastric antrum but no clear cause of the *** ultrasound was pursued,and the mass lesion was sampled via fine needle ***-procedure the patient experienced another episode of severe pain which prompted a repeat stat CT abdomen and pelvis with contrast;this re-demonstrated the 13 mm antral lesion and in addition was remarkable for a gastro-gastric *** upper gastrointestinal gastrograffin series was ordered(completed only after the pain had subsided)and showed resolution of the *** was consistent with a diagnosis of low-grade neuroendocrine tumor(NET).Surgery was initially deferred during the hospitilization given the low grade pathology of the lesion;however further multidisciplinary discussion between Surgery,Oncology,and Gastroenterology recommended resection given the patient’s recurrent abdominal pain with the NET functioning as a lead point for further intussusception,and the patient thus underwent robotically-assisted wedge *** We present a unique case of severe,intermittent,peri-umbilical pain related to gastro-gastric intussusception caused by an antral NET lead *** case highlights the importance of considering neoplasms as t

关键词： Abdominal pain Gastro-gastric intussusception Neuroendocrine tumor Case report

CD8+T cell metabolic flexibility elicited by CD28-ARS2 axisdriven alternative splicing of PKM supports antitumor immunity

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Cellular & Molecular Immunology 2024年第3期21卷 260-274页

作者： G.Aaron holling Colin A.Chavel Anand P.Sharda Mackenzie M.Lieberman Caitlin M.james Shivana M.Lightman Jason h.Tong Guanxi Qiao Tiffany R.Emmons Thejaswini Giridharan Shengqi hou Andrew M.Intlekofer Richard M.higashi Teresa W.M.Fan Andrew N.Lane Kevin h.Eng Brahm h.Segal Elizabeth A.Repasky Kelvin P.Lee Scott h.Olejniczak Department of Immunology Roswell Park Comprehensive Cancer CenterBuffaloNY 14263USA Department of Medicine Roswell Park Comprehensive Cancer CenterBuffaloNY 14263USA human Oncology and Pathogenesis Program Memorial Sloan Kettering Cancer CenterNew YorkNY 10065USA Center for Environmental Systems Biochemistry Department of Toxicology and Cancer Biology and Markey Cancer CenterLexingtonKY 40536USA Department of Cancer Genetics and Genomics Roswell Park Comprehensive Cancer CenterBuffaloNY 14263USA Present address:University of Colorado Boulder BoulderCO 80309USA Present address:Dana Farber Cancer Institute BostonMA 02215USA Present address:Massachusetts Institute of Technology BostonMA 02139USA Present address:Melvin and Bren Simon Comprehensive Cancer Center Indiana University School of MedicineIndianapolisIN 46202USA

Metabolic flexibility has emerged as a critical determinant of CD8+T-cell antitumor activity,yet the mechanisms driving the metabolic flexibility of T cells have not been *** this study,we investigated the influence of the nuclear cap-binding complex(CBC)adaptor protein ARS2 on mature T *** doing so,we discovered a novel signaling axis that endows activated CD8+T cells with flexibility of glucose ***2 upregulation driven by CD28 signaling reinforced splicing factor recruitment to pre-mRNAs and affected approximately one-third of T-cell activation-induced alternative splicing *** these effects,the CD28-ARS2 axis suppressed the expression of the M1 isoform of pyruvate kinase in favor of PKM2,a key determinant of CD8+T-cell glucose utilization,interferon gamma production,and antitumor effector ***,PKM alternative splicing occurred independently of CD28-driven PI3K pathway activation,revealing a novel means by which costimulation reprograms glucose metabolism in CD8+T cells.

关键词： Immunometabolism mRNA splicing CD8 T cells ARS2 PKM2

Geoepidemiologic variation in outcomes of primary sclerosing cholangitis

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World Journal of hepatology 2020年第4期12卷 116-124页

作者： Tej I Mehta Simcha Weissman Brian M Fung james h.tabibian Department of Medicine University of South Dakota Sanford School of MedicineSioux FallsSD 57108United States Department of Medicine Hackensack University-Palisades Medical CenterNorth BergenNJ 07047United States Department of Medicine Olive View-UCLA Medical CenterSylmarCA 91342United States Department of Medicine UCLA-Olive View Medical CenterSylmarCA 91342and Health Sciences Clinical Associate ProfessorDavid Geffen School of Medicine at UCLALos AngelesCA 90095United States

Primary sclerosing cholangitis(PSC)is a chronic,progressive,hepatobiliary disease characterized by inflammation and fibrosis of the intra-and extra-hepatic bile *** natural history is one that generally progresses towards cirrhosis,liver failure,cholangiocarcinoma,and ultimately disease-related death,with a median liver transplantation-free survival time of approximately 15-20 ***,despite its lethal nature,PSC remains a heterogenous disease with significant variability in outcomes amongst different regions of the *** are also many regions where the outcomes of PSC have not been studied,limiting the overall understanding of this disease *** this review,we present the geoepidemiologic variations in outcomes of PSC,with a focus on survival pre-and post-liver transplantation as well as the concurrence of inflammatory bowel disease and hepatobiliary neoplasia.

关键词： Cholangiocarcinoma Inflammatory bowel disease Liver transplantation Geography Biliary tract Autoimmune

Gastrostomy tubes: Fundamentals, periprocedural considerations, and best practices

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World Journal of Gastrointestinal Surgery 2022年第4期14卷 286-303页

作者： Anand Rajan Peerapol Wangrattanapranee Jonathan Kessler Trilokesh Dey Kidambi james h.tabibian Department ofGastroenterology Olive View-UCLA Medical CenterSylmarCA 91342United States Department ofGastroenterology City of Hope Medical CenterDuarteCA 91010United States Department ofMedicine Keck School of Medicine of USCLos AngelesCA 90033United States Department ofInterventional Radiology City of Hope Medical CenterDuarteCA 91010United States Department ofGastroenterology UCLA-Olive View Medical CenterSylmarCA 91342United States

Gastrostomy tube placement is a procedure that achieves enteral access for nutrition,decompression,and medication *** evaluation and selection of patients is necessary to provide optimal benefit and reduce the risk of adverse events(AEs).Appropriate indications,contraindications,ethical considerations,and comorbidities of patients referred for gastrostomy placement should be weighed and ***,endoscopist should consider either a transoral or transabdominal approach is appropriate,and radiologic or surgical gastrostomy tube placement is ***,medical history,physical examination,and imaging prior to the procedure should be considered to tailor the appropriate approach and reduce the risk of AEs.

关键词： Gastrostomy Gastropexy Enterostomy Decompression Enteral nutrition Endoscopy