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Palaeodepositional environment,implications of Glossopteris flora,and organic matter characteristics from the Lower Permian,Karo Open Cast Mine,East Bokaro Coalfield,Damodar Basin,India

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Journal of Palaeogeography 2024年第3期13卷 528-546页

作者： Sankar suresh kumar Pillai Rose Ann Sebastian Runcie Paul Mathews Srikanta Murthya Anju Saxena Mrutyunjaya Sahoo Suraj kumar Sahu Gulshan kumar Dhingra Birbal Sahni Institute of Palaeosciences Academy of Scientific and Innovative Research (AcSIR) Department of Geology School of Earth Science SystemsCentral University of Kerala Department of Geology Ravenshaw University Department of Botany Sri Dev Suman Uttarakhand University

The present study deals with the Early Permian floral diversity,palaeoenvironment,palaeoclimate and depositional setting using a multiproxy approach that includes morphotaxonomy,palynology,and organic geochemistry of Karo OCM （Open Cast Mine）,East Bokaro Coalfield,Damodar Gondwana Basin,*** Permian sediments of Peninsular India are widely regarded as fluvial,along with some marine *** macroplant fossil assemblage exhibits the presence of Glossopteridales,comprising Glossopteris,Gangamopteris,and Vertebraria,as well as Coniferales,which includes *** palynological assemblage encompasses the dominance of the striate bisaccate pollen Faunipollenites *** the subdominance of the non-striate bisaccate pollen Scheuringipollenites *** glossopterid *** megafloral and palynofloral assemblage confirms the biostratigraphical age to be Late Barakar palynoflora of Kungurian *** studied morphological characteristics,including small to large Glossopteris leaves exhibiting a lanceolate shape,acute apices,and acute cuneate or tapering bases,as well as entire margins with narrower lamina and narrow meshes,suggest the existence of a dense forest with the prevalence of a warm and humid climate during their *** organic geochemical characterization based on functional group and biomarker analyses reveals the diagenetic effects on organic *** symmetric(～2865-2855 cm-1) and asymmetric stretching (～2930-2910 cm-1) peaks are identifiable in coal samples,whereas they are absent in carbonaceous *** A-factor vs.C-factor plot suggests that the kerogen type is type Ⅲ,which can generate mainly gaseous *** vitrinite reflectance studies （Rrav.1.1%） show increased maturity of the samples,which is supported by the n-alkane distribution pattern and the absence of hopane *** Indian floral assemblages in contemporary of southern Gondwana continents reveal a stronger inclination/affinity with the fl

关键词： Glossopteris Palynomorph FTIR GCMS Gondwana Permian Palaeoclimate

Geochemical elements in suspended particulate matter of Ensenada de La Paz Lagoon,Baja California Peninsula,Mexico:Sources,distribution,mass balance and ecotoxicological risks

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Journal of Environmental Sciences 2024年第2期136卷 422-436页

作者： Sandra Soledad Morales-García Pilar de Acacia Pérez-Escamilla suresh Babu Sujitha Pichaimani Godwyn-Paulson Andrés Felipe Zuniga-Cabezas Muthuswamy Ponniah Jonathan Instituto Politécnico nacional(IPn) Centro Mexicano para la Producción más Limpia(CMPL)Av.Acueducto s/nCol.Barrio la Laguna TicománDel Gustavo A.MaderoC.P.07340Ciudad de MéxicoMexico Instituto Politécnico nacional(IPn) Escuela Superior de Ingeniería y Arquitectura(ESIA)Unidad Ticomán***án 600Delg.Gustavo A.MaderoC.P.07340Ciudad de México(CDMX)Mexico Instituto Politécnico nacional(IPn) Centro Interdisciplinario de Investigaciones y Estudios sobre Medio Ambiente y Desarrollo(CIIEMAD)Calle 30 de Junio de 1520Barrio la Laguna TicománDel.Gustavo A.MaderoC.P.07340Ciudad de MéxicoMéxico

The present study aimed to evaluate multi-element concentrations(Al,As,Ca,Cd,Co,Cr,Cu,Fe,Mg,Mn,Mo,ni,Pb,Sr)in suspended particulate material(SPM)collected from Ensenada de La Paz(ELP)lagoon,Baja California Sur,Mexico in two different periods(September and May)to comprehend their origin,geochemical behavior,mass transfer and associated ecotoxicological *** 24 hr variation coefficient of volumetric SPM levels were found to be 51.7%in September and 40.5%in May,signifying the effects of oceanic *** calculated enrichment factor(EF)values for all the studied elements were of higher magnitude because of the high surface area and oxide nature of SPM,and in this study,Mo had the highest EF of 46.77 probably due to its origin from continental *** the ecotoxicological perspective,the integrated toxic risk index revealed low toxic risk to the benthic ***,the mean-ERM-Quotient calculated using the particulate concentrations of As,Cd,Cr,Cu,ni,Pb indicated 9%probability of toxicity to *** comprehensive geochemical and ecotoxicological assessment of particulate metal concentrations in the ELP lagoon signify low to moderate contamination.

关键词： Suspended particulate material Heavy metals Risk assessment Mass transfer Ensenada de La Paz

Dielectric and physico-chemical behavior of single thermally thick wood blocks under microwave assisted pyrolysis

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Particuology 2024年第3期86卷 291-303页

作者： nicole Vorhauer-Huget Jakob Seidenbecher Supriya Bhaskaran Francesca Schenkel Lucas Briest suresh Gopalkrishna Jan Barowski Andrea Dernbecher Liane Hilfert Ilona Rolfes Alba Dieguez-Alonso Otto von Guericke University Magdeburg Universitatsplatz 239106MagdeburgGermany Ruhr University Bochum Institute of Microwave SystemsUniversitatsstraβe 15044801BochumGermany

Pyrolysis of thermally thick beech wood blocks with a size of around 2.5×8×6 cm^(3)(width×length×height)was carried out in a lab scale microwave reactor with a frequency of 2.45 GHz,operated,both,at 300 W and 600 W under inert conditions,using n_(2) at around 400 mbar absolute *** microwave cavity had a size of 20×20×20 cm^(3).The specific energy supply referred to the untreated wood block was 4-8 W/g,with slight variations depending on the initial water *** mass loss and the reflected microwave power were in-situ monitored during the *** sample surface and chamber temperatures were measured with a pyrometer and a thermocouple,***-chemical and dielectric properties of the produced solids were investigated and compared to those of chars produced under conventional pyrolysis using the same raw *** is shown that the complex dielectric permittivity of the solid products changed drastically during the pyrolysis process,with increasing heating properties as the conversion process *** was easily achieved using 60o W without ***,300 W was not enough to achieve a high conversion degree,independently of the irradiation ***,together with the physico-chemical analyses of the solids,hinted to the importance of the transport kinetics in thermally thick materials,although further investigationis still required.

关键词： Microwave assistedpyrolysis Conventional pyrolysis Dielectric measurements Penetration depth Elemental analysis

Feature Selection for Cluster Analysis in Spectroscopy

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Computers, Materials & Continua 2022年第5期71卷 2435-2458页

作者： Simon Crase Benjamin Hall suresh n.Thennadil College of Engineering IT&EnvironmentCharles Darwin UniversityCasuarinaNT 0909Australia Defence Science and Technology Group Edinburgh5111Australia Energy and Resources Institute Charles Darwin UniversityCasuarinaNT 0909Australia

Cluster analysis in spectroscopy presents some unique challenges due to the specific data characteristics in spectroscopy,namely,high dimensionality and small sample *** order to improve cluster analysis outcomes,feature selection can be used to remove redundant or irrelevant features and reduce the ***,for cluster analysis,this must be done in an unsupervised manner without the benefit of data *** paper presents a novel feature selection approach for cluster analysis,utilizing clusterability metrics to remove features that least contribute to a dataset’s tendency to *** versions are presented and evaluated:The Hopkins clusterability filter which utilizes the Hopkins test for spatial randomness and the Dip clusterability filter which utilizes the Dip test for *** new techniques,along with a range of existing filter and wrapper feature selection techniques were evaluated on eleven real-world spectroscopy datasets using internal and external clustering *** newly proposed Hopkins clusterability filter performed the best of the six filter techniques ***,it was observed that results varied greatly for different techniques depending on the specifics of the dataset and the number of features selected,with significant instability observed for most techniques at low numbers of *** was identified that the genetic algorithm wrapper technique avoided this instability,performed consistently across all datasets and resulted in better results on average than utilizing the all the features in the spectra.

关键词： Cluster analysis spectroscopy unsupervised learning feature selection wavenumber selection

Dietary Green Tea Extract and Antioxidants Improve Insulin Secretory Functions of Pancreatic β-Cells in Mild and Severe Experimental Rodent Model of Chronic Pancreatitis

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Open Journal of Endocrine and Metabolic Diseases 2024年第2期14卷 53-72页

作者： Galande Sheethal Ranjeet K. Tokala Pavan Pondugala Krishna Vemula Vijayalakshmi Venkatesan Pothani suresh Surya Satyanarayana Singh Guduru Venkat Rao Duvvur nageshwar Reddy Mitnala Sasikala Basic Science and Translational Research Division Asian Healthcare Foundation AIG Hospitals Hyderabad India Division of Cell and Molecular Biology National institute of Nutrition Hyderabad India national Animal Resource Facility for Biomedical Research Hyderabad India Department of Biochemistry Osmania University Hyderabad India Department of Surgical Gastroenterology Asian Institute of Gastroenterology Hyderabad India Department of Gastroenterology Asian Institute of Gastroenterology Hyderabad India

Chronic pancreatitis (CP) is a progressive inflammatory disorder of the pancreas. It is predominantly idiopathic (with an unknown cause) in India and mostly due to alcohol in the West. Diabetes that occur secondary to chronic pancreatitis (T3c Diabetes) is often brittle, and is difficult to attain normoglycemia with conventional treatment requiring multiple doses of insulin. Mild and severe model of CP was induced in mice by repeated intraperitoneal injections of cerulein and L-arginine respectively with an intent to study islet dysfunction and develop therapeutic strategy in animal models of CP. Dietary intervention of epigallocatechin-3-gallate (EGCG) was tested in both the models of CP for its beneficial effects on insulin secretory functions. Pancreata collected upon euthanasia were used to study alterations in the morphology of pancreatic parenchyma and inflammation by staining with H&E and fibrotic changes by Masson’s trichrome and picrosirius staining. Insulin secretory functions of islets were evaluated to test the efficacy of the dietary intervention on β-cell functions. Intraperitoneal glucose tolerance test was performed to monitor the glucose homeostasis before and after the dietary intervention. Both the models resulted in CP with dispersed acini, inflammation and fibrosis. The loss of acini and extent of fibrosis was more in L-arginine model. 2-fold improvement in glucose-stimulated insulin secretory functions of islets was observed with 0.5% EGCG dietary intervention in cerulein model of CP and 1.6-fold in L-arginine model of CP. A further improvement in insulin secretion by 3.2-fold was observed with additional dietary supplements like n-acetyl cysteine, curcumin in combination with EGCG. Our results thus demonstrate and highlight the therapeutic potential of dietary green tea (EGCG) supplementation in reversing islet dysfunction and improving glucose homeostasis in experimental chronic pancreatitis in mice.

关键词： Dietary Intervention C57BL6/J Mice Epigallocatechin-3-Gallate n-Acetyl Cysteine Curcumin Chronic Pancreatitis Islets Glucose Stimulated Insulin Secretion

Development and validation of a stability-indicating RP–HPLC method for estimation of atazanavir sulfate in bulk

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Journal of Pharmaceutical Analysis 2017年第2期7卷 134-140页

作者： S.Dey S.Subhasis Patro n.suresh Babu P.n.Murthy S.K.Panda Dr.B.C.Roy College of Pharmacy&Allied Health Sciences Meghnad Saha SaraniBidhannagarDurgapur713206West BengalIndia Royal College of Pharmacy and Health Sciences Dist.-GanjamBerhampur 760002OrissaIndia

A stability-indicating reverse phase–high performance liquid chromatography（RP–HPLC） method was developed and validated for the determination of atazanavir sulfate in tablet dosage forms using C_（18） column Phenomenix（250 mm×4.6 mm, 5 μm） with a mobile phase consisting of 900 mL of HPLC grade methanol and100 mL of water of HPLC grade. The pH was adjusted to 3.55 with acetic acid. The mobile phase was sonicated for 10 min and filtered through a 0.45 μm membrane filter at a flow rate of 0.5 mL/min. The detection was carried out at 249 nm and retention time of atazanavir sulfate was found to be 8.323 min. Linearity was observed from 10 to 90 μg/mL（coefficient of determination R^2 was 0.999） with equation, y=23.427x＋*** sulfate was subjected to stress conditions including acidic, alkaline, oxidation, photolysis and thermal degradation, and the results showed that it was more sensitive towards acidic degradation. The method was validated as per ICH guidelines.

关键词： Atazanavir sulfate RP–HPLC Isocratic elution Validation Stability indicating

Evolution of fracture permeability due to co-colloidal bacterial transport in a coupled fracture-skin-matrix system

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Geoscience Frontiers 2012年第4期3卷 503-514页

作者： n.natarajan G.suresh kumar EWRE Division Department of Civil EngineeringIndian Institute of TechnologyMadrasChennai 600036India Department of Ocean Engineering Indian Institute of TechnologyMadrasChennai 600036India

A numerical model is developed for investigating the evolution of fracture permeability in a coupled fracture-matrix system in the presence of fracture-skin with simultaneous colloidal and bacte- rial transport, by taking into account the effects of thermal stress and silica precipitation/dissolution, which is computed using linear reaction kinetics. The non-linear coupled equations are numerically modeled using the fully implicit finite difference method and a constant continuous source is adopted while modeling thermal, contaminant, colloidal and bacterial transport. Due to co-colloid bacterial trans- port under non-isothermal conditions, in a coupled fracture-skin-matrix system, the fracture apertures vary spatially, with a corresponding pressure variation for a constant discharge. A series of numerical experiments were conducted for analyzing the spatial variation of fracture aperture in response to the combined effects of thermal stress, silica precipitation/dissolution, and simultaneous colloidal and bacte- rial transport in the presence of the fracture-skin. The simulation results suggest that temperature and contaminant concentration of the mobile fluid within the fracture increases with reduction in initial frac- ture aperture. The pattern of variation followed by the fracture aperture is nearly the same in the presence and absence of bacterial transport but the magnitude of the fracture aperture is low under the influence of bacterial transport. The variation in the fracture aperture resulting from precipitation-dissolution and thermoelastic stress is significant when the fracture aperture is very low and reduces with increment in fracture aperture. The variation in fracture aperture and pressure remains the same for both undersaturated and supersaturated fluid entering the fracture due to the influence of bacterial transport at the inlet of the fracture.

关键词： Bacterial transport Colloidal transport Fracture permeability Fracture skin Precipitation-dissolution

Half-a-century(1971–2020)of glacier shrinkage and climatic variability in the Bhaga basin,western Himalaya

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Journal of Mountain Science 2023年第3期20卷 299-324页

作者： DAS suresh SHARMA Milap Chand MURARI Madhav Krishna nÜSSER Marcus SCHMIDT Susanne Centre for the Study of Regional Development Jawaharlal Nehru UniversityNew Delhi 110067India national Geochronology Facility Inter-University Accelerator CentreNew Delhi 110067India Department of Geography South Asia Institute(SAI)Heidelberg UniversityHeidelberg 69115Germany Heidelberg Centre for the Environment(HCE) Heidelberg UniversityHeidelberg 69120Germany

Glacier shrinkage is a globally occurring ***-resolution change detection based on frequent mapping and monitoring of high-altitude glaciers is necessary to precisely evaluate future water availability and to understand glacier evolution under different climatic scenarios in the Hindukush-Karakoram-Himalayan(HKH)*** also holds true for the Bhaga basin of the western *** study investigates glacier and glacier lake changes in the Bhaga basin,over the last five decades based on satellite imagery including Corona KH4(1971),Landsat 7 Enhanced Thematic Mapper Plus(ETM+;2000),Linear Imaging Self-Scanning Sensor(LISS Ⅳ;2013),and Sentinel 2(2020).Regional temperature and precipitation trends were evaluated from gridded climatic datasets(1900–2020).In the Bhaga basin 306 glaciers(>0.2 km^(2))were mapped with a total area of 360.3±4.0 km^(2),of which 55.7±0.6 km^(2)was covered with debris in *** total glacier covered area decreased by∼8.2±1.5%(0.16±0.03%yr-1)during the entire observation period 1971–2020,with noticeable heterogeneity between tributary *** the past two decades(2000–2020),the deglaciation rate has increased significantly(0.25%yr-1)compared to the previous decades(1971–2000;0.12%yr-1).Glacier lake area increased by 0.6±0.1 km^(2)(0.012 km^(2)yr-1)between 1971 and *** nCEP/nCAR climatic data reveals an increase of 0.63℃in temperature and a decrease of 6.39 mm in precipitation for the period 1948–*** comparison,APHRODITE data shows an increasing trend in temperature of 1.14℃between 1961 and 2015 and decreasing trend in precipitation of 31 mm between 1951 and *** nCEP/nCAR and APHRODITE data reveal significant temperature increase and precipitation decrease since the 1990s,which have probably augmented ice loss in the Bhaga basin during the early 21st century.

关键词： Glacier change Remote sensing APHRODITE nCEP/nCAR reanalysis Climate change Western Himalaya

Recent progress in emerging BiPO_(4)-based photocatalysts:Synthesis,properties,modification strategies,and photocatalytic applications

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Journal of Materials Science & Technology 2022年第13期108卷 208-225页

作者： Rohit kumar Pankaj Raizada Aftab Aslam Parwaz Khan Van-Huy nguyen Quyet Van Le suresh Ghotekar Rangabhashiyam Selvasembian Vimal Gandhi Archana Singh Pardeep Singh School of Advanced Chemical Sciences Shoolini UniversitySolan(Himachal Pradesh)-173212India Center of Excellence for Advanced Materials Research King Abdulaziz UniversityP.O.Box 80203Jeddah 21589Saudi Arabia Chemistry Department Faculty of ScienceKing Abdulaziz UniversityP.O.Box 80203Jeddah 21589Saudi Arabia Faculty of Biotechnology Binh Duong UniversityThu Dau MotVietnam. Department of Materials Science and Engineering Korea University145Anam-ro Seongbuk-guSeoul 02841South Korea Department of Chemistry Smt.Devkiba Mohansinhji Chauhan College of Commerce and ScienceSilvassa 396230University of MumbaiDadra and Nagar Haveli(UT)India Department of Chemistry S.N.ArtsD.J.M.Commerce and B.N.S.Science CollegeSangamner 422605Savitribai Phule Pune UniversityMaharashtraIndia Department of Biotechnology School of Chemical and BiotechnologySASTRA Deemed UniversityThanjavur-613401TamilnaduIndia Department of Chemical Engineering Faculty of TechnologyDharmsinh Desai UniversityNadiad-387001GujaratIndia Advanced Materials and Processes Research Institute Hoshangabad RoadBhopal 462026India

In this perspective,we have highlighted the current literature and explained the synthesis,structure,morphology,modification strategies,and photocatalytic applications of emerging BiPO_(4)-based *** BiPO_(4)is a large bandgap photocatalyst,it uses UV light for the excitation of electrons,and also,the recombination of charge carriers is an issue in BiPO_(4).Various novel modification strategies of BiPO_(4)photocatalysts *** modifications,heterojunction formation,phase-junctions,surface plasmon resonance,Schottky junction have been successfully proposed and *** modifications enhance the light absorption and inhibit the recombination of charge carriers BiPO_(4)***,future aspects for further research on BiPO_(4)-based photocatalysts are also *** expects that BiPO_(4)-based photocatalysts represent a promising strategy for developing practical photocatalysts for energy and environmental remediation applications.

关键词： Photocatalysis Modification strategies Environmental remediation BiPO_(4)photocatalyst