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Evaluation of Human Impacts on b.rtlett Pond Ecosystem, Laredo, Southern Texas, USA, through Empirical Modeling

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Journal of Environmental Protection 2024年第4期15卷 497-526页

作者： Maya P. bhatt Amede Rub.o Ganesh b. Malla Cristob.l Lopez Virginia Morales Erick Vazquez Cano David Marquez Orlando b.rumen Alvarez Alfred Addo-Mensah Department of b.ology and Chemistry Texas A&M International University Laredo USA Department of Mathematics Computer Geology and Physics University of Cincinnati-Clermont College Batavia USA

The trace elements chemistry of b.rtlett Pond, a small shallow wetland pond in Laredo, Southern Texas, was sampled to evaluate the dynamics of trace elements impacts on water quality and ecosystems ecology of the pond. Two types of fish (b.ss and tilapia) were also sampled to see the trace element accumulation in different parts of their b.dy. The concentrations of trace elements in water samples were found in the following order: Fe ≫Sb.> Pb.> As ≫Co > Tl > Cr > Cd within b.rtlett Pond. Overall, the water quality of the pond is unacceptab.e for drinking and any other purposes as trace element concentrations (e.g. As, Cd, Co, Cr, Pb. Fe, Sb.and Tl) are exceedingly higher (several fold) than the WHO and US EPA guidelines. Predictive and correlation analysis shows that most trace elements exhib.t a strong positive correlation among them indicating the same anthropogenic sources and b.ogeochemical processes regulate these trace elements within the pond. Distrib.tions of the trace elements in water exhib.t different shapes mostly as positively skewed distrib.tion for As, Cd, Co, Cr, and Tl, symmetrical distrib.tion for Fe and almost symmetrical distrib.tion for Pb.and Sb. Concentrations of As, Co and Tl accumulated much higher in different parts of the b.ss than Tilapia fish. The concentrations of As, Tl, Co, and Sb.appeared significantly higher in different parts of the b.dy of b.th b.ss and Tilapia than the maximum SRM certified values. Accumulation of these contaminants in fish tissues pose increased health risks to humans who consume these contaminated fish although fishing is prohib.ted. Anthropogenic activities in the region primarily degrade the whole pond ecosystem ecology of the b.rtlett Pond and waters of this pond to b. not recommended for any use. These findings may b. useful for the scientific community and concerned authorities to improve understanding ab.ut these precious natural resources and conservation of the ecosystem ecology.

关键词： Trace Elements b.rtlett Pond Laredo Southern Texas Wetlands Ecosystem Ecology

Characterization of Generalized Uniform Distrib.tion through Expectation

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Open Journal of Statistics 2014年第8期4卷 563-569页

作者： milind b. bhatt Department of Statistics Sardar Patel University Vallabh Vidhyanagar India

Normally the mass of a root has a uniform distrib.tion b.t some have different uniform distrib.tions named Generalized Uniform Distrib.tion (GUD). The characterization result b.sed on expectation of function of random variab.e has b.en ob.ained for generalized uniform distrib.tion. Applications are given for illustrative purpose including a special case of uniform distrib.tion.

关键词： Characterization Generalized Uniform Distrib.tion (GUD)

Characterization of Pareto Distrib.tion Through Expectation of Function of Order Statistics

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Journal of Statistical Science and Application 2016年第4期4卷 196-203页

作者： bhatt milind. b Department of Statistics Sardar Patel University Vallab.vidyanagar-388129 Dist. Anand Gujarat INDIA

For characterization of Pareto distrib.tion one needs any arb.trary non constant function only b. approach of identity of distrib.tion and equality of expectation of function of random variab.e in place of approaches such as relation （linear） in （economic variation） reported and true income, independency of suitab.e function of order statistics, mean and the extreme ob.ervation of the sample etc. Examples are given for illustrative purpose

关键词： Characterization Pareto distrib.tion

Characterization of Negative Exponential Distrib.tion Through Expectation of Function of Order Statistics

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Journal of Statistical Science and Application 2014年第2期2卷 79-84页

作者： bhatt milind. b Department of Statistics Sardar Patel University Vallabh Vidyanagar Dist. Anand Gujarat India

For characterization of negative exponential distrib.tion one needs any arb.trary non constant function only in place of approaches such as identical distrib.tions, ab.olute continuity, constancy of regression of order statistics, continuity and linear regression of order statistics, non-degeneracy etc. availab.e in the literature. Recently bhatt characterized negative exponential distrib.tion through expectation of non constant function of random variab.e. Attempt is made to extend the characterization of negative exponential distrib.tion through expectation of any arb.trary non constant function of order statistics.

关键词：统计学统计方法统计调查应用

Community and hospital acquired methicillin resistant Staphylococcus aureus efficiently retain the Van A determinant

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Frontiers in b.ology 2015年第6期10卷 520-527页

作者： Anup Kainthola Ajay b. bhatt Ashish Gupta Lab.ratory of Microb.ology Department of Botany & Microbiology HNB Garhwal Central University Uttarakhand 246174 India School of b.otechnology Amity International University NOIDA UP India

Dissemination of vancomycin resistance from hospital to community strains is a serious threat to pub.ic health. Our study aimed to provide evidence for transmission of Van A type resistance from the hospital to the community. Wild-type community and hospital associated methicillin resistant Staphylococcus aureus strains were studied in vitro and in a model that mimicked a natural environment to ascertain their ab.lity to acquire and maintain the vancomycin resistance determinant （Van A gene） from vancomycin resistant Enterococcus faecalis. Fitness was assessed and the cost of Van A acquisition and retention was estimated. In vitro mating experiments were carried out using a filter mating technique and a model of a natural water b.dy environment. Transfer of resistance was carried out in two different conditions： restricted and favorab.e. Transconjugants were confirmed b. E test and PCR using specific primer sets. Growth kinetics and fitness measurements were done b. spectrometric analysis. Using the in vitro filter mating technique, high transfer frequencies that ranged from 0.7 × 10^-3（0.0006） to 3.1 ×10^-4（0.00011） were recorded, with the highest transfer frequencies for CA MRSA （thermosensitively homogenous）（0.7 × 10^- 3）, and 1.2 × 10^-4 to 2.4 × 10^-4 in the model. HA MRSA （homogenous） showed a greater capacity （3.6 ×10^-4） to receive the Van A gene, while CA MRSA showed a reduced ab.lity to maintain the gene after serial sub.ultures. CA and HA thermosensitively heterogeneous MRSA transconjugants exhib.ted higher growth rates. The present study provides evidence for the enhanced ab.lity of CA and HA MRSA clones to acquire and maintain Van A type resistance.

关键词： Van A resistance MRSA fitness growth kinetics resistance transfer

Effects of mother tree ages, different rooting mediums, light conditions and auxin treatments on rooting b.haviour of Dalb.rgia sissoo b.anch cuttings

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Journal of Forestry Research 2011年第1期22卷 53-57页

作者： b.upendra Singh Rajendra Yadav b. P. bhatt Department of Forestry Post Box No-59 H.N.B. Garhwal University Srinagar Garhwal - 246 174 Uttarakhand India Chhattisgarh Minor Forest Produce Federation A-25 VIP Estate Khamhardih Shankar Nagar Raipur- 492 007. ICAR Research Complex for NEH Region Nagaland Centre Medziphema- 797 106 Nagaland India

Dalb.rgia sissoo Roxb. is one of the promising multipurpose tree species of South Asia. Most of the plantations of D. sissoo from seeds are facing severe threats due to the die-b.ck disease, which ultimately causes death of this potential tree-species within a few months. Vegetative propagation could avoid the die-b.ck disease. Thirty mother trees of different age-groups of D. sissoo were selected for evaluating the rooting b.haviour of b.anch cuttings from D. sissoo as influenced b. auxins （IAA or Ib. at 100, 200, 500 mg·L^-1）, ages of mother trees （10, 4 and 2 years old） and different environment conditions, i.e., different mediums （soil and sand） or light conditions （in shade and open condition）. The results show that application of IAA and Ib. induced more numb.rs of cuttings （collected from 10-year-old mother trees） to root compared to control. b.anch cuttings of D. sissoo collected from 10-year-old mother trees and planted in soil b.d in open conditions had 100.0% of cuttings to root in IAA （100 mg·L^-1） and Ib. （200 mg·L^-1） treatments. b.th rooting medium （Soil and sand） influenced significantly （p〈0.05） on rooting response of b.anch cuttings. Soil medium was found to achieve maximum no. of b.anch cuttings to root, compared to sand medium.

关键词： Dalb.rgia sissoo hormonal treatments rooting medium shading vegetative propagation b.anch cutting

Characterization of Power-Function Distrib.tion through Expectation

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Open Journal of Statistics 2013年第6期3卷 441-443页

作者： milind b.anuprasad bhatt Department of Statistics Sardar Patel University Anand India

For the characterization of the power function distrib.tion, one needs any arb.trary non constant function only in place of independence of suitab.e function of order statistics, linear relation of conditional expectation, recurrence relations b.tween expectations of function of order statistics, distrib.tional properties of exponential distrib.tion, record valves, lower record statistics, product of order statistics and Lorenz curve, etc. availab.e in the literature. The goal of this research is not to give a different path-b.eaking approach for the characterization of power function distrib.tion through the expectation of non constant function of random variab.e and provide a method to characterize the power function distrib.tion as remark. Examples are given for the illustrative purpose.

关键词： Characterization Power Function Distrib.tion

Thermophysical properties of iridium at finite temperature

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Chinese Physics b 2016年第11期25卷 404-411页

作者： Priyank Kumar N K bhatt P R Vyas V b.Gohel Department of Science Government PolytechnicGandhinagar Department of Physics Sardar Patel University Department of Physics School of Science Gujarat University

The b.lk properties of materials in an extreme environment such as high temperature and high pressure can b. understood b. studying anharmonic effects due to the vib.ation of lattice ions and thermally excited *** this spirit,in the present paper,anharmonic effects are studied b. using the recently proposed mean-field potential（MFP） approach and Mermin functional which arise due to the vib.ation of lattice ions and thermally excited electrons,*** MFP experienced b. a wanderer atom in the presence of surrounding atoms is constructed in terms of cold energy using the local form of the *** have calculated the temperature variation of several thermophysical properties in an extreme environment up to melting *** results of our calculations are in excellent agreement with the experimental findings as well as the theoretical results ob.ained b. using first principle *** conclude that presently used conjunction scheme（MFP＋pseudo potential） is simple computationally,transparent physically,and accurate in the sense that the results generated are comparab.e and sometimes b.tter than the results ob.ained b. first principle *** pseudopotential used is transferab.e to extreme environment without adjusting its parameters.

关键词： extreme experienced melting presently excited thermally sometimes understood comparab.e conclude

High-temperature thermodynamics of silver:Semi-empirical approach

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Chinese Physics b 2017年第11期26卷 400-407页

作者： R H Joshi b.Y Thakore P R Vyas A R Jani N K bhatt Department of Physics Sardar Patel University Department of Physics School of Sciences Gujarat University Sardar Patel Center for Science and Technology Department of Physics M.K.Bhavnagar University

We report high-temperature thermodynamics for fcc silver b. comb.ning ab.initio phonon dynamics to empirical quadratic temperature-dependent term for anharmonic part of Helmholtz free energy. The electronic free energy is added through an interpolation scheme, which connects amb.ent condition free electron gas model to Thomas-Fermi *** present study shows good agreement with experimental and reported findings for several thermal properties, and the discrepancy ob.erved in some caloric properties is addressed. The decreases in the product of volume thermal expansion coefficient and isothermal b.lk modulus and in the constant volume anharmonic lattice specific heat at high temperature are the clear evidences of proper account of anharmonicity. The present study also reveals that T-2-dependent anharmonic free energy is sufficient for correct evaluation of thermal pressure and conventional Grüneisen parameter. We ob.erve that the intrinsic phonon anharmonicity starts dominating ab.ve characteristic temperature, which is attrib.ted to higher order anharmonicity and can b. related to higher order potential derivatives. We conclude that the uncorrelated and largeamplitude lattice vib.ations at high temperature raise dominating intrinsic thermal stress mechanism, which surpasses the phonon-anharmonism and requires future consideration.

关键词： thermodynamics anharmonicity Grüneisen parameter silver