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Selective removal of Photocatalytically Active Anatase TiO_(2)Phase from Mixed-Phase TiO_(2)-ZnO Nanocomposites:Impact on Physicochemical Properties and Photocatalytic Activity

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Energy & Environmental Materials 2020年第4期3卷 548-559页

作者： Nambath Gayathri Menon Sankara sarma v.Tatiparti Suparna Mukherji Centre for research in Nanotechnology and Science Indian Institute of Technology BombayMumbai Maharashtra 400076India Department of Energy Science and Engineering Indian Institute of Technology BombayMumbai Maharashtra 400076India Environmental Science and Engineering Department Indian Institute of Technology BombayMumbai Maharashtra 400076India

TiO_(2)-ZnO nanocomposites were synthesized by varying Ti:Zn molar ratio from 1:0.1(TZ-1:0.1)to 1:1(TZ-1:1).With increase in Zn content,from TZ-1:0.1 to TZ-1:0.2,anatase transformed to rutile ***-1:0.3,which contained a blend of phases,including rutile and anatase TiO_(2),ZnO,and zinc titanates,exhibited the narrowest bandgap(2.5±0.1 e v),and showed the highest photocatalytic ***-1:1 was predominated by zinc *** the nanocomposites exhibited narrower bandgaps compared to pure TiO_(2)nanoparticles,facilitating visible light *** study was designed to explore whether a method targeting the removal of a specific crystalline phase(anatase)influenced the properties and photocatalytic activity of the *** dissolution not only removed anatase phase,but also led to significant loss of crystallinity,widened the bandgap,and adversely affected photocatalytic performance,in nanocomposites that contained>80%anatase phase(TZ-1:0.1 and TZ-1:0.2).However,in nanocomposites that contained less of anatase phase(TZ-1:0.3and TZ-1:1),the morphology,bandgap,crystallinity,and the extent of photocatalytic activity at the end of 240 min remained largely *** activity in TZ-1:0.3 and TZ-1:1 originated from a blend of phases comprising of less photocatalytically active phases,such as rutile TiO_(2),Zn TiO3,and Zn2TiO4,rather than from the anatase *** Ti:Zn molar ratio controlled the phases present in TiO_(2)-ZnO nanocomposites,which,in turn,controlled the physicochemical properties and visible light ***,in nanocomposites that contained a mix of several phases,the properties and photocatalytic activity were not dependent on anatase phase.

关键词： anatase TiO_(2) TiO_(2)–ZnO nanocomposites visible light photocatalysis

Gut and liver involvement in pediatric hematolymphoid malignancies

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World Journal of Gastrointestinal Oncology 2022年第3期14卷 587-606页

作者： Umeshreddy v Devarapalli Moinak S sarma Gopinathan Mathiyazhagan Department of Pediatric Gastroenterology Sanjay Gandhi Postgraduate Institute of Medical SciencesLucknow 226014Uttar PradeshIndia Department of Hematology Sanjay Gandhi Postgraduate Institute of Medical SciencesLucknow 226014Uttar PradeshIndia

Hematolymphoid malignancies are common neoplasms in *** involvement of the gastrointestinal(GI)tract,liver,biliary system,pancreas,and peritoneum are closely interlinked and commonly *** leukemias,lymphomas,and Langerhans cell histiocytosis(LCH),the manifestations result from infiltration,compression,overwhelmed immune system,and chemotherapyinduced drug *** acute leukemias,major manifestations are infiltrative hepatitis,drug induced gastritis,neutropenic typhlitis and chemotherapy related *** leukemias are *** presentation in lymphomas is cholestasis due to infiltration or biliary obstruction by lymph nodal *** of ascites needs a thorough workup for the underlying pathophysiology that may modify the therapy and affect the *** hematolymphoid malignancies are primary hepatic,hepatosplenic,and GI lymphomas which have strict *** advanced diseases with extensive spread,it may be impossible to distinguish these diseases from the primary site of *** produces biliary strictures that mimic as sclerosing *** infiltration is associated with poor liver recovery even after *** heterogeneity of gut and liver manifestations in hematolymphoid malignancies has a clinical impact on their *** chemotherapy is the mainstay of therapy in all hematolymphoid malignancies,debulking surgery and radiotherapy have an adjuvant role in specific clinical *** situations presenting as liver failure or end-stage liver disease require liver *** their initial presentation to a primary care physician,given the ambiguity in clinical manifestations and the prognostic difference with time-bound management,it is vital to recognize them early for optimal *** data from robust registries across the world is required for better understanding of these complications.

关键词： Leukemia Lymphoma Langerhans cell histiocytosis Gastrointestinal Hepatobiliary

Laser Heated Emissive Probes Design and Development under National Fusion Program and Potential Measurement

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Chinese Physics Letters 2014年第12期31卷 74-78页

作者： MEHTA Payal sarma Arun GHOSH Joydeep venus International College of Technology Gandhinagar Gujarat India School of Advanced Sciences VIT University Chennai Vandalur-Kelambakkam Road Chennai 600127 India Institute for Plasma research Bhat Gandhinagar 382428 Gujarat India

Emissive probes are the tools for the direct deter- mination of the plasma potential ~PL and they deliver a more reliable measure of φPL compared to the indi- rect measurements with cold Langmuir probes. The emissive probe works on the principle of compensating the well-known asymmetry of the I-v characteristic of a single cold Langmuir probe by an electron emission current from the probe into the plasma. In an ideal case, the saturated value of floating potential v（А,em） of a highly emissive probe should equal the plasma potential. A conventional emissive probe usu- ally consists of a loop of tungsten wire heated by an electric current passing through it. These conven- tional emissive probes containing an electric current- heated metal wire loop suffer a huge drawback when it comes to their lifetime. The metal wire used in these probes evaporates and subsequently breaks when heated with high current, leading to frequent replacements of these wires. When used in ultra high vacuum （UHv） plasma systems, frequent replacement of these wires requires frequent vacuum breaks in the plasma systems. In many plasma systems espe- cially in magnetized toroidal hot plasmas like toka- maks, where determination of the electric fields leads to a great deal of useful information, frequent breaking of the vacuum is impossible for changing the filament of the emissive probes. Hence, along with the other drawbacks of the conventional emissive probes such as limited emission current, bending in a magnetic field makes their use impractical in these plasma systems. The most suitable alternative is the emissive probes heated by a focused infra-red laser. Due to them having several advantages over the conventional emis- sive probes, laser heated emissive probes （LHEPs） are found to have more and more uses in plasma systems. The advantages of the LHEP are： longer lifetime （no filament breaking issues）, attainment of higher tem- perature without melting or evaporation and thus higher emissivi

关键词： Laser heating Emissivity Plasma potentials Nuclear fusion Laser materials processing

Localization of polycyclic aromatic hydrocarbons and heavy metals in surface soil of Asia’s oldest oil and gas drilling site in Assam,northeast India:Implications for the bio-economy

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Emerging Contaminants 2016年第3期2卷 119-127页

作者： Hemen sarma N.F.Islam P.Borgohain A.sarma M.N.v.Prasad Department of Botany N N Saikia CollegeTitabarAssamIndia Department of Biotechnology Pandu CollegeGuwahatiAssamIndia Department of Plant Science University of HyderabadHyderabadTelanganaIndia

The environmental influx of hazardous contaminants viz PAHs and HMs occurs due to oil and gas drilling,and processing of petroleum products in industrial facilities and *** problem plagues crude oil drilling sites as PAHs are an essential component of and HMs coexist with crude *** analyzed the spatial distribution of 16 PAHs and 8 HMs in 10 contaminated sites of Assam,a state in *** included Digboi,where crude oil was drilled in 1867 and the first oil well in Asia that was ***Ʃ16 PAHs in soil were detected with a minimum of 13.48 and a maximum of 86.3 mgkg1 andƩ8 heavy metal concentrations in the soil ranged between 69.51 and 336.06 mgkg1.A negative correlation was detected between the relative concentrations of PAHs and *** results confirmed that the nonbiodegradable nature of HMs made them stay in the soil for longer periods of *** our study,we found that the levels of lead,copper,nickel,and chromium(total)in soil were 73.62,11.86,58.97 and 158.66 mgkg*** recovery percentage for PAHs and HMs were in the range of 67e97%and 90e95%*** distribution indices for Phenanthrene/Anthracene,Naphthalene/Acenapthhylene,Chyrsene/Benzo(g,h,i)perylene and Fluranthene/Pyrene)calculated for soil samples indicated that the spatial distribution of PAHs in soil is uneven which might be due to variations in contaminates disseminated in *** regionalized concentration has serious implications on the bio-economy both in terms of health and economy,especially since the proximity of crude oil sites to paddy fields and/or tea plantations uniquely marks the landscape of upper Assam.

关键词： PAH Heavy metals Spatial distribution indices Oil Drilling site

Pb–Pb baddeleyite ages of mafic dyke swarms from the Dharwar Craton:Implications for Paleoproterozoic LIPs and diamond potential of mantle keel

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Geoscience Frontiers 2020年第6期11卷 2127-2139页

作者： D.Srinivasa sarma v.Parashuramulu M.Santosh E.Nagaraju N.ramesh Babu CSIr-National Geophysical research Institute Uppal RoadHyderabad500007India School of Earth Sciences and resources China University of Geosciences(Beijing)Beijing100083China Department of Earth Sciences University of AdelaideAdelaideSA5005Australia

The Dharwar Craton in Peninsular India was intruded by a series of mafic dykes during the Paleoproterozoic and these mafic magmatic events have important implications on continental rifting and *** we report ten precise Pb-Pb TE-TIMS age determinations on baddeleyite grains separated from seven mafic dykes and three sills,intruding into Archean basement rocks and Proterozoic sedimentary formations of the Eastern Dharwar Craton *** crystallization age of the baddeleyite shows 2366.3±1.1 Ma,and 2369.2±0.8 Ma for the NE-SW trending dykes,2368.1±0.6 Ma,2366.4±0.8 Ma,2207.2±0.7 Ma and 1887.3±1.0 Ma for the ENE-WNW to E-W striking dykes,1880.6±1.0 Ma,1864.3±0.6 Ma and 1863.6±0.9 Ma for Cuddapah sills,and 1861.8±1.4 Ma for the N-S trending *** results in conjunction with those from previous studies identify eight distinct stages of widespread Paleoproterozoic magmatism in the Dharwar *** mantle plume centres of the four radiating dyke swarms with ages of^2367 Ma,~2210 Ma,~2082 Ma,and^1886 Ma were traced to establish their proximity to the EDC kimberlite *** the^2367 Ma and^1886 Ma plume centres are inferred to be located to the west and east of the present day Dharwar craton respectively away from the kimberlite province,location of plume heads of the other two swarms with ages of^2207 Ma and^2082 Ma are in close *** spite of the ubiquitous occurrence of dyke intrusions of all the seven generations in the kimberlite province,only few of these kimberlites are *** occurrences elsewhere in the vicinity of older Large Igneous Provinces(LIPs)like the Mackenzie,Karoo,Parana-Etendeka and Yakutsk-vilui are also *** has been attributed to the destruction of the lithospheric mantle keel(that hosts the diamonds)by the respective mantle *** diamondiferous nature of the EDC kimberlites therefore suggests that plume activity does not always result in the destruction of the mantle keel.

关键词： Paleoproterozoic mafic dykes Baddeleyite geochronology Kimberlite Large igneous province Dharwar craton

Comparison of conventional and supported liquid extraction methods for the determination of sitagliptin and simvastatin in rat plasma by LC-ESI-MS/MS

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Journal of Pharmaceutical Analysis 2015年第3期5卷 161-168页

作者： B.ramesh N.Manjula S.r.Bijargi v.U.M.sarma P.Sita Devi Natural Products Chemistry Division Indian Institute of Chemical Technology Medicinal Chemistry & Pharmacology Division Indian Institute of Chemical Technology

Three extraction methods were compared for their efficiency to analyze sitagliptin and simvastatin in rat plasma by LC-MS/MS, including （1） liquid-liquid extraction （LLE）, （2） solid phase extraction （SPE） and （3） supported liquid extraction （SLE）. Comparison of recoveries of analytes with different extraction methods revealed that SLE was the best extraction method. The detection was facilitated with ion trap-mass spectrometer by multiple reactions monitoring （MrM） in a positive ion mode with ESI. The transitions monitored were m./z 441.1→325.2 for simvastatin, 408.2→235.1 for sitagliptin and 278.1→260.1 for the IS. The lower limit of quantification （LLOQ） was 0.2 ng/mL for sitagliptin and 0.1 ng/mL for simvastatin. The effective SLE offers enhanced chromatographic selectivity, thus facilitating the potential utility of the method for routine analysis of biological samples along with pharmacokinetic studies.

关键词： rat plasma Simvastatin Sita#'ptin Supported liquid extraction

Mitochondrial hepatopathy: Anticipated difficulties in management of fatty acid oxidation defects and urea cycle defects

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World Journal of Hepatology 2022年第1期14卷 180-194页

作者： Aathira ravindranath Moinak Sen sarma Division of Pediatric Gastroenterology Institute of Gastrointestinal SciencesApollo BGS HospitalsMysore 570023KarnatakaIndia Pediatric Gastroenterology Sanjay Gandhi Postgraduate Institute of Medical SciencesLucknow 226014Uttar PradeshIndia

Fatty acid oxidation defects(FAOD)and urea cycle defects(UCD)are among the most common metabolic liver *** of these disorders is dotted with challenges as the strategies differ based on the type and severity of the *** those with FAOD the cornerstone of management is avoiding hypoglycemia which in turn prevents the triggering of fatty acid *** this review,we discuss the role of carnitine supplementation,dietary interventions,newer therapies like triheptanoin,long-term treatment and approach to positive newborn *** UCD the general goal is to avoid excessive protein intake and indigenous protein ***,one size does not fit all and striking the right balance between avoiding hyperammonemia and preventing deficiencies of essential nutrients is a formidable *** issues during the acute presentation including differential diagnosis of hyperammonemia,dietary dilemmas,the role of liver transplantation,management of the asymptomatic individual and monitoring are described in detail.A multi-disciplinary team consisting of hepatologists,metabolic specialists and dieticians is required for optimum management and improvement in quality of life for these patients.

关键词： Mitochondrial hepatopathy Metabolic liver disease Liver transplantation Hyperammonemia Hypoglycemia Carnitine

Pediatric acute viral hepatitis with atypical variants:Clinical dilemmas and natural history

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World Journal of Hepatology 2022年第5期14卷 944-955页

作者： Moinak Sen sarma Aathira ravindranath Department of Pediatric Gastroenterology Sanjay Gandhi Postgraduate Institute of Medical SciencesLucknow 226014Uttar PradeshIndia Division of Pediatric Gastroenterology Apollo BGS HospitalsMysuru 570023KarnatakaIndia

Classical acute viral hepatitis(AvH)has an uncomplicated *** liver failure has a grave *** manifestations of AvH are a group of disorders that causes significant morbidity and dilemmas in *** include prolonged cholestasis,relapsing hepatitis,ascitic form of AvH,late-onset hepatic failure(LOHF),intravascular hemolysis,and provoking an autoimmune trigger leading to autoimmune *** entities cause significant liver dysfunction or worsening and are often difficult to differentiate from chronic liver disease(CLD).Ascitic form of AvH,LOHF,decompensated CLD and acute-onchronic liver failure have significant overlapping features that need to be carefully dissected *** many cases,only on long-term follow-up,these clinical entities can be separately *** hemolysis is usually caused by associated glucose-6-phosphate dehydrogenase *** CLD such as Wilson disease and autoimmune hepatitis can also present with hemolysis in the initial presentation,which can mimic AvH with *** deviations from typical manifestations aid in avoiding unnecessary investigations,allowing focused therapy and alleviating anxiety.

关键词： viral Hepatitis Atypical Cholestasis relapsing Hemolysis Ascites

Pediatric non-cirrhotic portal hypertension:Endoscopic outcome and perspectives from developing nations

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World Journal of Hepatology 2021年第10期13卷 1269-1288页

作者： Moinak Sen sarma Jayendra Seetharaman Department of Pediatric Gastroenterology Sanjay Gandhi Postgraduate Institute of Medical SciencesLucknow 226014Uttar PradeshIndia

Non-cirrhotic portal hypertension(NCPH)forms an important subset of portal hypertension in *** bleed and splenomegaly are their predominant *** features show cytopenias(hypersplenism)and preserved hepatic synthetic *** sessions of endoscopic variceal ligation or endoscopic sclerotherapy eradicate esophageal varices in almost all *** variceal eradication,there is an increased risk of other complications like secondary gastric varices,cholangiopathy,colopathy,growth failure,especially in extra-hepatic portal vein obstruction(EHPvO).Massive splenomegaly-related pain and early satiety cause poor quality of life(QoL).Meso-rex bypass is the definitive therapy when the procedure is anatomically feasible in *** portosystemic shunt surgeries with splenectomy are indicated when patients present late and spleen-related issues *** surgeries prevent rebleed,improve growth and ***-cirrhotic portal fibrosis(NCPF)is a less common cause of portal hypertension in children in developing *** in the second decade,massive splenomegaly and patent portal vein are discriminating features of *** surgery is required in severe cases when endotherapy is insufficient for the *** hepatic fibrosis(CHF)presents with firm palpable liver and *** plate malformation forms the histological hallmark of *** is commonly associated with Caroli’s disease,renal cysts,and syndromes associated with neurological *** CHF has a favourable prognosis requiring *** transplanta-tion is required when there is decompensation or recurrent cholangitis,especially in Caroli’s *** liver-kidney transplantation is indicated when both liver and renal issues are present.

关键词： Extrahepatic portal vein obstruction Non-cirrhotic portal fibrosis Portosystemic shunt surgery Congenital hepatic fibrosis