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Biosorption of Cr(Ⅳ),Cr(Ⅲ),Pb(Ⅱ) and Cd(Ⅱ) from Aqueous Solutions by Sargassum wightii and Caulerpa racemosa Algal Biomass

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Journal of Ocean University of China 2012年第1期11卷 52-58页

作者： Narayanaswamyb Tamilselvan kumar Saurav Krishnan Kannabiran Biomolecules and Genetics Division School of Biosciences and TechnologyVIT UniversityVellore-632014TamilNaduIndia

Heavy metal pollution is one of the most important environmental problems *** is an innovative tech-nology that employs biological materials to accumulate heavy metals from waste water through metabolic process or physicochemi-cal pathways of *** though several physical and chemical methods are available for removal of heavy metals,currently many biological materials such as bacteria,algae,yeasts and fungi have been widely used due to their good performance,low cost and large quantity of *** aim of the present study is to explore the biosorption of toxic heavy metals,Cr（VI）,Cr（iiI）,Pb（ii） and Cd（ii） by algal biomass obtained from algae Sargassum wightii（brown） and Caulerpa racemosa（green）.Biosorption of algal biomass was found to be biomass concentration-and pH-dependent,while the maximal biosorption was found at pH 5.0 and with the metal concentration of 100 mg *** showed the maximal metal biosorption at the biomass concentration of 25 g L-1,followed by *** with the maximal biosorption at 30 g *** showed 78% biosorption of Cr（VI）,Cr（iiI）,Pb（ii） and Cd（ii） *** exhibited 85% biosorption of Cd（ii） and Cr（VI）,and 50% biosorption of Cr（iiI） and Pb（ii）.The results of our study suggest that seaweed biomass can be used efficiently for

关键词： heavy metals biosorption brown algae green algae bioaccumulation sea weeds

Biosorption of Ni(Ⅱ) ions from aqueous solution using modified Aloe barbadensis Miller leaf powder

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Water Science and Engineering 2019年第1期12卷 27-36页

作者： Shweta Gupta S.K.Sharma Arinjay kumar University School of Chemical Technology Guru Gobind Singh Indraprastha University

This study aimed to investigate the biosorption potential of Na2CO3-modified Aloe barbadensis Miller (Aloe vera) leaf (MABL) powder for removal of Ni(ii) ions from a synthetic aqueous solution. Effects of various process parameters (pH, equilibrium time, and temperature) were investigated in order to optimize the biosorptive removal. The maximum biosorption capacity of MABL was observed to be 28.986 mg/g at a temperature of 303 K, a biosorbent dose of 0.6 g, a contact time of 90 min, and a pH value of 7. Different kinetic models (the pseudo-first-order, pseudo-second-order, Elovich, and intraparticle diffusion models) were evaluated. The pseudo-second-order kinetic model was found to be the best fitted model in this study, with a coefficient of determination of R^2 =0.974. Five different isotherm models (the Langmuir, Freundlich, Temkin, Dubinin-Radushkevich, and Brunauer-Emmett-Teller (BET) models) were investigated to identify the best-suited isotherm model for the present system. Based on the minimum chi-square value (X^2 =0.027) and the maximum coefficient of determination (R^2 =0.996), the Langmuir isotherm model was found to represent the system well, indicating the possibility of monolayer biosorption. The sticking probability (S*) was found to be 0.41, suggesting a physisorption mechanism for biosorption of Ni(ii) on MABL. The biosorbent was characterized using Fourier-transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), zeta potential, and BET surface area, in order to understand its morphological and functional characteristics.

关键词： Biosorption A. barbadensis Miller leaf powder Ni(ii) Biosorption isotherm Sticking probability Kinetics

Enhanced oil recovery by nonionic surfactants considering micellization, surface, and foaming properties

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Petroleum Science 2017年第2期14卷 362-371页

作者： Achinta Bera Ajay Mandal Hadi Belhaj Tarkeswar kumar Petroleum Engineering Department The Petroleum Institute P.O. Box 2533 Abu Dhabi United Arab Emirates Department of Petroleum Engineering Indian Institute of Technology (Indian School of Mines) Dhanbad Jharkhand 826004 India

Surfactants for enhanced oil recovery are important to study due to their special characteristics like foam generation,lowering interfacial tension between oleic and aqueous phases,and wettability alteration of reservoir rock *** is a good mobility control agent in enhanced oil recovery for improving the mobility *** the present work,the foaming behavior of three nonionic ethoxylated surfactants,namely Tergitol 15-S-7,Tergitol 15-S-9,and Tergitol 15-S-12,was studied *** the surfactants,Tergitol 15-S-12 shows the highest *** effect of Na Cl concentration and synthetic seawater on foaming behavior of the surfactants was investigated by the test-tube shaking *** critical micelle concentrations of aqueous solutions of the different nonionic surfactants were measured at 300 *** was found that the critical micelle concentrations of all surfactants also increased with increasing ethylene oxide *** light scattering experiments were performed to investigate the micelle sizes of the surfactants at their respective critical micelle *** flooding experiments were carried out in sand packs using the surfactant *** was found tha t22% additional oil was recovered in the case of all the surfactants over secondary water *** 15-S-12exhibited the maximum additional oil recovery which is more than 26%after water injection.

关键词： Enhanced oil recovery Ethylene oxide number Foaming properties Surfactant flooding Micellization

Efficacy and safety validation of traditional products--current regulatory status in India

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中国药理学与毒理学杂志 2018年第4期32卷 247-248页

作者： Dinesh kumar BHARATRAJ National Institute of Nutrition Indian Council of Medical Research Jamai-Osmania Tarnaka Hyderabad 500007 India

The traditional medicine differs from country to country and region to region and is dependent on indigenous cultural *** one decade there is a growing demand of natural products as potential preventive and therapeutic agents all over the *** international agencies especially WHO recognized Ayurveda,Unani,siddha as a part of integrated system of medicine to achieve health for *** WHO recognition acceptance of Ayurveda has been limited mainly due to:i) Lack of scientific validation in current acceptable terms;ii) A general inadequacy of Good Manufacturing Practices;iii) Non availability of safety profile at pre-clinical and clinical levels;iv) In-adequate documentation of true extent of toxicity;iv) Contamination of herbal ***,validating therapeutic claims of traditional preparation and evaluation of safety profile has become important not only for global acceptance but for compliance to National and International regulatory guidelines.

关键词：传统医学地方文化发展现状医疗卫生行业

“A Prospective Randomized Case-Control Study To Evaluate Mini Right Thoracotomy versus Conventional Sternotomy For Mitral Valve Repair In Rheumatic Heart Disease.”

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World Journal of Cardiovascular Surgery 2016年第11期6卷 139-152页

作者： ashok kumar Chahal Preeti Gehlaut Sanjay Johar Ashish Asija Divya Arora Naveen Malhotra Kuldeep Singh Lallar Shamsher Singh Lohchab Department of Cardiac Surgery Pandit Bhagwat Dayal Sharma Post Graduate Institute of Medical Sciences Rohtak India Department of Anaesthesiology Pandit Bhagwat Dayal Sharma Post Graduate Institute of Medical Sciences Rohtak India Department of Cardiac Surgery Max Hospital Delhi India Department of Cardiology Pandit Bhagwat Dayal Sharma Post Graduate Institute of Medical Sciences Rohtak India

Purpose: Right mini thoracotomy has been evaluated in many studies for mitral valve repair mainly in degenerative valvular disease but not in rheumatic heart disease. Mitral valve repair is more challenging in rheumatic etiology due to complexity of lesions. This prospective randomized case control study was designed to evaluate repair through mini right thoracotomy and to compare the clinical and echocardiographic outcomes with sternotomy in rheumatic patients. Methods: 25 patients of rheumatic heart disease underwent mitral valve repair through mini right thoracotomy (group I). Various clinical and functional parameters were compared with 25 patients of mitral valve repair through sternotomy (group ii). On follow up the results were compared in both groups for clinical and echocardiographic parameters. Results: The various pre-operative demographic parameters were comparable in two groups. Equal rate of mitral valve repair (group I-21/25, 84% and group ii-21/25, 84%) was achieved in both groups. The various intra-operative and post-operative clinical parameters were better in group I .There were equivalent functional and valve related outcomes in both groups in term of NYHA class (1.28 ± 0.613 vs 1.08 ± 0.276, P = 0.144), post-operative mitral valve area (2.43 ± 0.891 vs 2.82 ± 0.662, P = 0.090), incidence of more than mild mitral regurgitation (0) and mean pressure gradient across mitral valve (4.98 ± 3.33 vs 4.23 ± 1.5, P = 0.309). Conclusion: Mitral valve repair through mini right thoracotomy approach in rheumatic etiology is feasible and safe with equivalent rate of successful repair as compared to median sternotomy. It is associated with lesser morbidity, cosmetic advantage and lesser resource utilization.

关键词： “Rheumatic Heart Disease Minimally Invasive Mitral Valve Repair Right antero-lateral thoracotomy.” Mitral valve repair

Fractional-Order Model of the Disease Psoriasis:A Control Based Mathematical Approach

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Journal of Systems Science & Complexity 2016年第6期29卷 1565-1584页

作者： CAO Xianbing DATTA Abhirup AL BASIR Fahad ROY Priti kumar College of Science Beijing Technology and Business University Centre for Mathematical Biology and Ecology Department of MathematicsJadavpur University

Autoimmune diseases are generated through irregular immune response of the human body. Psoriasis is one type of autoimmune chronic skin diseases that is differentiated by T-Cells mediated hyper-proliferation of epidermal Keratinocytes. Dendritic Cells and CD8＋ T-Cells have a significant role for the occurrence of this disease. In this paper, the authors have developed a mathematical model of Psoriasis involving CD4＋ T-Cells, Dendritic Ceils, CD8＋ T-Cells and Keratinocyte cell populations using the fractional differential equations with the effect of Cytokine release to observe the impact of memory on the cell-biological system. Using fractional calculus, the authors try to explore the suppressed memory, associated with the cell-biological system and to locate the position of Keratinocyte cell population as fractional derivative possess non-local property. Thus, the dynamics of Psoriasis can be predicted in a better way using fractional differential equations rather than its corresponding integer order model. Finally, the authors introduce drug into the system to obstruct the interaction between CD4＋ T-Cells and Keratinocytes to restrict the disease Psoriasis. The authors derive the Euler-Lagrange conditions for the optimality made through Matlab by developing iterative of the drug induced system. Numerical simulations are schemes.

关键词： Fractional differential equations (FDEs) memory optimal control problem pMHC Pso-riasis.

Development of a drill energy utilization index for aiding selection of drill machines in surface mines

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International Journal of Mining Science and Technology 2017年第3期27卷 393-399页

作者： kumar Suraj Rahul Talreja Murthy V.M.S.R. Department of Mining Engineering Indian School of Mines Dhanbad India

Drill machines used in surface mines, particularly in coal, is characterized by a very poor utilization （around 40%） and low availability （around 60%）. The main purpose of this study is to develop a drill selec- tion methodology and simultaneously a performance evaluation technique based on drill cuttings produced and drilling rate achieved. In all 28 blast drilled through were investigated. The drilling was accomplished by 5 different drill machines of Ingersoll-Rand and Revathi working in coal mines of Sonepur Bazari （SECL） and Block-ii （BCCL）. The drills are Rotary and Rotary Percussive type using tri- cone rock roller bits. Drill cuttings were collected and sieve analysis was done in the laboratory. Using Rosin Ramler Diagram, coarseness index （CI）, mean chip size （d）, specific-st trace area （SSA） and charac- teristic particle size distribution curves for all the holes drilled were plotted. The predictor equation for drill penetration rate established through multiple regressions was found to have a very good correlation with an index of determination of 0.85. A comparative analysis of particle size distribution curves was used to evaluate the drill efficiency. The suggested approach utilises the area under the curve, after the point of trend reversal and brittleness ratio of the respective bench to arrive at drill energy utilization index （DEUI）, for mapping of drill machine to bench, The developed DEU1 can aid in selecting or mapping a right machine to right bench for achieving higher penetration rate and utilizations.

关键词： Drill cutting parameter Coarseness index Mean chip size Specific surface area Particle size distribution curves Drill energy ptilization index

Above and below ground organic carbon stocks in a sub-tropical Pinus roxburghii Sargent forest of the Garhwal Himalayas

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Forestry Studies in China 2012年第3期14卷 205-209页

作者： Mehraj A.SHEIKH Sanjay kumar Munesh kumar Department of Forestry and Natural Resources H.N.B.Garhwal UniversitySrinagar(Garhwal)Uttarakhand 246174India

Accurate estimates of tree carbon, forest floor carbon and organic carbon in forest soils （SOC） are important in order to determine their contribution to global carbon （C） stocks. However, information about these carbon stocks is lacking. Some studies have investigated regional and continental scale patterns of carbon stocks in forest ecosystems; however, the changes in C storage in dif- ferent components （vegetation, forest floor and soil） as a function of elevation in forest ecosystems remain poorly understood. In this study, we estimate C stocks of vegetation, forest floor and soils of a Pinus roxburghii Sargent forest in the Garhwal Himalayas along a gradient to quantify changes in carbon stock due to differences in elevation at three sites. The biomass of the vegetation changes drastically with increasing elevation among the three sites. The above-ground biomass （AGB） and below-ground biomass （BGB） were highest at site I （184.46 and 46.386 t·ha^-1 respectively） at an elevation of 1300 m followed by site ii （173.99 and 44.057 t·ha^-1 AGB and BGB respectively） at 1400 m and the lowest AGB and BGB were estimated at site iiI （161.72 and 41.301t·ha^-1） at 1500 m. The trend for SOC stock was similar to that of biomass. Our results suggest that carbon storage （in both soil and biomass） is nega- tively correlated with elevation.

关键词： biomass carbon organic carbon stock in soils sub-tropical region Himalayas

Anaemia in Critically Ill COVID-19 Patients: A Cohort Study

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Advances in Infectious Diseases 2022年第1期12卷 80-89页

作者： Sundar Raj ashok Santosh Narat Intensive Care Medicine Croydon University Hospital London UK Worthing General Hospital Worthing UK

Anaemia is common in critically ill patients and has been shown to be a predictor of mortality in general Intensive Therapy Unit (ITU). Patients with Corona Virus Infectious Disease 2019 (CV-19) have also been reported to be anaemic, more profound in those admitted to ITU. We report our experience in the management of anaemic CV-19 patients admitted to ITU between 1st March and 1st June 2020. Demographic and clinical variables collected included age, sex, BMI, Charlson comorbidity index (CCI), Acute Physiology and Chronic Health Evaluation (APACHE) ii score, haemoglobin concentration, blood transfusion, and mortality. 105 patients were admitted to the ITU with Severe Acute Respiratory Syndrome Coronavirus 2 disease requiring invasive mechanical ventilation and 73 patients with complete dataset were included in the study. Results: 36 patients (49%) were anaemic on admission, with 56 (77%) patients developing anaemia at some stage in the first 7 days of ITU stay. Anaemia at admission to ITU, a higher CCI and a higher APACHE ii score were all independently associated with a blood transfusion (OR 12.5, 95% CI: 1.48 - 106, p = 0.02), (OR 1.95, 95% CI: 1.08 - 3.52, p = 0.03) and (OR 4.8, 95% CI: 1.48 - 15.6, p = 0.009) respectively. Univariable analysis showed that an increasing age (OR 2.15, 95% CI: 1.18 - 3.91, p = 0.01) and a higher APACHE ii score (OR 1.60, 95% CI 1.01 - 2.54, p = 0.04) were significantly associated with mortality. There was also some evidence of an association with mortality for CCI, although the results for this variable were only of borderline statistical significance. Neither haemoglobin concentration (OR 1.09, 95% CI: 0.83 - 1.43, p = 0.55) or anaemia (OR 1.08, 95% CI: 0.41 - 2.85, p = 0.87) at admission to ITU was significantly associated with mortality. 13 patients received blood transfusions, with a mean (SD) pretransfusion Hb of 75.2 (12.02). These numbers were too small to identify any association between receiving blood transfusion and mort

关键词： Anaemia CV-19 SARS-CoV-2 Blood Transfusion Mortality