检索结果-南通市图书馆

Determination of hemoglobin adduct of a musk xylene metabolite in trout as bioma.k.r of exposure by gas chromatography mass spectrometry

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2005年第6期17卷 989-992页

作者： Mohammad abdul kARIM Mohammad Rezaul Department of Chemistry and Biochemistry Baylor University P.O. Box 97348 Waco TX 76798-7348 USADepartment of Biochemistry and Molecular Biology University of Rajshahi Rajshahi 6205 Bangladesh

Musk xylene（MX） is frequently used as fragrances in formulation of personal care products. Quantification of a bound 4-amino- MX（4-AMX） as cysteine adducts in trout hemoglobin（Hb） was made by gas chromatography-ion trap-mass spectrometry（GC/MS）. The Hb samples were collected from trout after 24 h exposure to MX at 10μg/g, and or menhaden oil（control）. The formation of cysteine-Hb adduct was observed from nitroso derivative of MX, released by a.k.line hydrolysis. The released 4-AMX metabolite was extracted in n- hexane. The extract was then reduced by evaporation, and analyzed by GC/MS. When similar agreement of mass spectral features and retention time of 4-AMX were obtained in both standard and sample solutions, the presence of 4-AMX metabolite in the Hb was confirmed. The concentration of 4-AMX was found to be 3.1 × 10^-6 6.9 × 10^-6 mg/g in the Hb solution. Quantitation was made based on an internal standard, a calibration plot, and response factor. In the non-hydrolyzed and laboratory bla.k.extracts, the 4-AMX metabolite was not detected. Additionally, coeluting and interfefing ions were observed in the biological samples.

关键词： bioma.k.rs musk xylene metabolite Hb adducts fish exposure

Osmotic concentration of succinic acid by forward osmosis:Influence of feed solution pH and evaluation of seawater as draw solution

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Engineering 2018年第5期26卷 976-983页

作者： Jeng Yih Law abdul Wahab Mohammad Department of Chemical and Process Engineering Faculty of Engineering and Built Environment Universiti Kebangsaan Malaysia Section of Chemical Engineering Technology Universiti Kuala Lumpur Malaysian Institute of Chemical & Bioengineering Technology

In this study, we investigated the essential role of feed solution pH so as to gain insights into the transport mechanisms of succinic acid concentration by osmotically-driven forward osmosis （FO） process. FO performances including water flux and bidirectional transport of succinate and chloride anions were systematically examined using cellulose triacetate-based FO membrane. Additionally, real seawater was explored as draw solution. Experimental results revealed that the pH-dependent speciation of succinic acid can affect the FO performances. Ionization of succinic acid at higher solution pH enhanced the osmotic pressure of feed solution, thus leading to lower water flux performance. A strong effect was pointed out on the succinate rejection for which nearly 100% rejections were achieved at pH above its pka2 value. The rejection of succinate increased in the following order of chemical form： C2H4C2O4H2 〈 C2H4C2OH- 〈 C2H4C2O24-. With real seawater as the draw solution, low to moderate water fluxes （〈4 L. m- 2. h- 1 ） were observed. The divalent succinate anion was highly retained in the feed side despite differences in the succinic acid feed concentration at pH of approximately 6.90.

关键词： Forward osmosis Succinic acid pH Transport mechanism Seawater

1-D coupled non-equilibrium sediment transport modeling for unsteady flows in the discontinuous Galerkin framework

在线全文

学校读者我要写书评

暂无评论

Journal of Hydrodynamics 2016年第4期28卷 534-543页

作者： Farzam Safarzadeh MALEkI abdul a.k.AN Engineering Department Massachusetts Maritime Academy Glenn Department of Civil Engineering Clemson University

A high-resolution, 1-D numerical model has been developed in the discontinuous Galerkin framework to simulate 1-D flow behavior, sediment transport, and morphological evaluation under unsteady flow conditions. The flow and sediment concentration variables are computed based on the one-dimensional shallow water flow equations, while empirical equations are used for entrainment and deposition processes. The sediment transport model includes the bed load and suspended load components. New formulations for Harten-Lax-van Leer （HLL） and Harten-Lax-van Contact （HLLC） are presented for shallow water flow equations that include the bed load and suspended load fluxes. The computational results for the flow and morphological changes after two dam break events are compared with the physical model tests. Results show that the modified HLL and HLLC formulations are robust and can accurately predict morphological changes in highly unsteady flows.

关键词： dam break flow sediment transport modeling Harten-Lax-van Leer (HLL) and Harten-Lax-van Contact (HLLC) fluxfunctions discontinuous Galerkin scheme

A review on first principles based studies for improvement of cathode material of lithium ion batteries

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2018年第1期27卷 219-237页

作者： Arslan Ullah abdul Majid Naema Rani Department of Physics.University of Cujrat.50700 Gujrat Pakistan Office of Research Innovation and CommercializationUniversity of GujratGujratPakistan

Lithium ion batteries（LIBs） are currently best energy storage devices providing rechargeable electrical storage to wide variety of applications – from portable electronics to automobiles. Though, these batteries are fully adopted, widely used and commercialized, but researchers are still extensively working on their constituent materials and developing technology to improve their performance. A major part of related research activities is devoted to the electrode of the battery for improvement in its performance thereby addressing issues like safety, lifetime, specific capacity, energy density and most importantly abundance and cost. There are number of cathode materials that have been proposed and tested at laboratory scale and subsequently utilized in commercialized batteries ever since the appearance of LIBs. Owing to the availability of improved computational resources in the last decade, first principles calculation has become a reliable tool and played a vital role to predict the material properties of electrodes prior to their experimental analysis. This review gives a comprehensive insight and thorough analysis of the global research efforts related to the cathode materials based on first principles framework, sheds light on current status of knowledge and explores the ways forward.

关键词： Lithium ion batteries Electrodes First principles methods

Emerging evidence of neuronal cells-targeting SARS-CoV-2 causing anosmia associated with COVID-19

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Research 2023年第2期18卷 463-464页

作者： abdul Mannan Baig Department of Biological and Biomedical Sciences Aga Khan UniversityKarachiPakistan

The anosmia and hypogeusia that accompany the syndromic manifestations of coronavirus disease2019(COVID-19)have become an increasing area of research during the current *** deficits are experienced as a major concern and are found to compromise the lifestyle of patients during and after acute phase of *** key issue is the prevalence of smell and taste disorders that have been reported in some patients after partial recovery from COVID-19.

关键词： acute patients prevalence

Degradation of ^(14)C-glyphosate and aminomethylphosphonic acid (AMPA) in three agricultural soils

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2010年第9期22卷 1374-1380页

作者： abdul Jabbar Al-Rajab Michel Schiavon Laboratory of Soil and Environmental Sciences 54505 Vandoeuvre-lès-Nancy Cedex France Agriculture and Agri-Food Canada London Ontario N5V 4T3 Canada

Glyphosate （N-phosphonomethyl glycine） is the most used herbicide worldwide. The degradation of ^14C-labeled glyphosate was studied under controlled laboratory conditions in three different agricultural soils： a silt clay loam, a clay loam and a sandy loam soil. The kinetic and intensity of glyphosate degradation varied considerably over time within the same soil and among different types of soil. Our results demonstrated that the mineralization rate of glyphosate was high at the beginning of incubation and then decreased with time until the end of the experiment. The same kinetic was observed for the water extractable residues. The degradation of glyphosate was rapid in the soil with low adsorption capacity （clay loam soil） with a short half-life of 4 days. However, the persistence of glyphosate in high adsorption capacity soils increased, with half-live of 19 days for silt clay loam soil and 14.5 days for sandy loam soil. HPLC analyses showed that the main metabolite of glyphosate, arninomethylphosphonic acid （AMPA） was detected after three days of incubation in the extracts of all three soils. Our results suggested that the possibility of contamination of groundwater by glyphosate was high on a long-term period in soils with high adsorption capacity and low degrading activities and/or acid similar to sandy loam soil. This risk might be faster but less sustainable in soil with low adsorption capacity and high degrading activity like the clay loam soil. However, the release of non-extractable residues may increase the risk of contamination of groundwater regardless of the type of soil.

关键词： glyphosate aminomethylphosphonic acid (AMPA) mineralization degradation soil

Loss of smell in COVID-19:reasons for variable recovery patterns from anosmia

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Research 2022年第7期17卷 1623-1624页

作者： abdul Mannan Baig Department of Biological and Biomedical Sciences Aga Khan UniversityKarachiPakistan

To the Editor,Anosmia,which coupled with altered or loss of taste,during the current pandemic in individuals has heralded the onset of coronavirus disease 2019(COVID-19).The recovery from the anosmia has been seen to ... 详细信息

关键词： COV cases reasons

Effect of channel shape on selection of time marching scheme in the discontinuous Galerkin method for 1-D open channel flow

在线全文

学校读者我要写书评

暂无评论

Journal of Hydrodynamics 2015年第3期27卷 413-426页

作者： SAFARZADEH MALEkI Farzam kHAN abdul A. Engineering Department Massachusetts Maritime Academy Glenn Department of Civil Engineering Clemson University

One-dimensional open channel flows are simulated using the discontinuous Galerkin finite element method. Three different explicit time marching schemes, including multistep/multistage schemes, are evaluated for different channel shapes for accuracy and efficiency. The Forward Euler, second-order Adam-Bashforth （multistep）, and second-order total variation diminishing （TVD） Runge-kutta （multistage） time marching schemes are utilized. The role of monotonized central, minmod, and zero TVD slope limiters for each of the time marching scheme is investigated. The numerical flux is approximated using HLL function. The accuracy and robustness of different time marching schemes are evaluated for steady and unsteady flows using analytical and measured data. The unsteady flows include dam break tests with wet and dry beds downstream of the dam in prismatic （rectangular, trapezoidal, triangular, and parabolic cross-sections） and non-prismatic （natural river） channels. The steady flow test involves simulation of hydraulic jump in a diverging rectangular channel. The various schemes are evaluated by comparing accuracy using statistical measures and efficiency using maximum possible time step size as well as CPU runtime. The second-order Adam-Bashforth time marching scheme is found to have the best accuracy and efficiency among the time stepping schemes tested.

关键词： discontinuous Galerkin method shallow water equations time marching schemes total variation diminishing (TVD)slope limiter

Larvicidal and repellent activity of medicinal plant extracts from Eastern Ghats of South India against malaria and filariasis vectors

在线全文

学校读者我要写书评

暂无评论

Asian Pacific Journal of Tropical Medicine 2011年第9期4卷 698-705页

作者： Chinnaperumal kamaraj abdul abdul Rahuman Asokan Bagavan Gandhi Elango abdul Abduz Zahir Thirunavukkarasu Santhoshkumar Unit of Nanotechnology and Bioactive Natural Products Post Graduate and Research Department of Zoology.C.Abdul Hakeem CollegeMelvisharam - 632 509Vellore DistrictTamil Nadu.India

Objective:To evaluate the larvicidal and repellent activities of ethyl acetate and methanol extracts of Acacia concinna（***）,Cassia siamea（***）.Conundrum sativum（C. sativum）,Cuminum cyminum（***）,Lantana camma（***）,Nelumbo nucifera （***） Phyllanlhus amarus（***）.Piper nigrum（***） and Trachyspermum ammi（***） against Anopheles stephensi（***） and Culex quinquefasciatus（Cx. quinquefasciatus）.Methods:The larvicidal activity of medicinal plant extracts were tested against earl) fourth-instar larvae of malaria and filariasis *** mortality was observed 24 h and 48 h after treatment,data were subjected to probit analysis to determine the lethal concentrations(LC50 and LC90) to kill 50 and 90 per cent of the treated larvae of the tested species. The repellent efficacy was determined against two mosquito species at five concentrations（31.25. 62.***.125.00.250.00,and 500.00 ppm） under the laboratory ***:All plant extracts showed moderate effects after 24 h and 48 h of exposure;however,the highest activity was observed after 24 h in the leaf methanol extract ol *** ethyl acetate and methanol extract of *** against the larvae of ***(LC50 = 34.***.24.54 and 30.20 ppm) and against ***(LC50= 37.***.43.94 and 57.39 ppm),*** toxic effect of leaf methanol extract of ***,seed methanol extract of ***,leaf ethyl acetate extract of *** ethyl acetate and methanol extract of *** and seed methanol extract of *** were showed 100%mortality against *** and *** alter 48 h *** maximum repellent activity was observed at 500 ppm in methanol extracts of N. *** acetate and methanol extract of *** and methanol extract of *** and the mean complete protection time ranged from 30 to 150 min with the different extracts tested. Conclusions:These results sugges

关键词： Medicinal plant extracts Anopheles stephensi Culex quinquefascialus Larvicidal activity Repellent activity