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Optimization of process parameters for the bioconversion of activated sludge by Penicillium corylophilum, using response surface methodology

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Journal of Environmental Sciences 2007年第1期19卷 23-28页

作者： sarkar Mannan Ahmadun Fakhru'l-Razi md Zahangir Alam Department of Chemical and Environmental Engineering Faculty of Engineering University Putra Malaysia (UPM)43400 UPM SerdangSelangorD.E.Malaysia. Department of Biotechnology Engineering Faculty of Engineering International Islamic University Malaysia (IIUM)Jalan Gombak53100 Kuala LumpurMalaysia.

The optimization of process parameters for the bioconversion of activated sludge by Penicillium corylophilum was investigated using response surface methodology （RSM）. The three parameters namely temperature of 33℃, agitation of 150 r/min, and pH of 5 were chosen as center point from the previous study of fungal treatment. The experimental data on chemical oxygen demand （COD） removal （%） were fitted into a quadratic polynomial model using multiple regression analysis. The optimum process conditions were determined by analyzing response surface three-dimensional surface plot and contour plot and by solving the regression model equation with Design Expert software. Box-Behnken design technique under RSM was used to optimize their interactions, which showed that an incubation temperature of 32.5℃, agitation of 105 r/min, and pH of 5.5 were the best conditions. Under these conditions, the maximum predicted yield of COD removal was 98.43%. These optimum conditions were used to evaluate the trail experiment, and the maximum yield of COD removal was recorded as 98.5%.

关键词： optimization response surface methodology Penicillium activated sludge domestic wastewater sludge

Efficient removal of heavy metals from electroplating wastewater using polymer ligands

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Frontiers of Environmental Science & Engineering 2016年第2期10卷 352-361页

作者： md. Lutfor RAHMAN Shaheen M. sarkar Mashitah Mohd YUSOFF Faculty of Industrial Sciences & Technology Universiti Malaysia Pahang 26300 Gambang Kuantan Malaysia

Poly（hydroxamic acid）-poly（amidoxime） che- lating ligands were synthesized from poly（methyl acrylate-co-acrylonitrile） grafted acacia cellulose for removing toxic metal ions from industrial wastewaters. These ligands showed higher adsorption capacity to copper （2.80 mmol. g-l） at pH 6. In addition, sorption capacities to other metal ions such as iron, zinc, chromium, and nickel were also found high at pH 6. The metal ions sorption rate （tl/2） was very fast. The rate of adsorption of copper, iron, zinc, chromium, nickel, cobalt, cadmium and lead were 4, 5, 7, 5, 5, 8, 9 and 11 min, respectively. Therefore, these ligands have an advantage to the metal ions removal using the column technique. We have successfully investigated the known concentration of metal ions using various parameters, which is essential for designing a fixed bed column with ligands. The wastewater from electroplating plants used in this study, having chromium, zinc, nickel, copper and iron, etc. For chromium wastewater, ICP analysis showed that the Cr removal was 99.8% and other metal ions such as Cu, Ni, Fe, Zn, Cd, Pb, Co and Mn removal were 94.7%, 99.2%, 99.9%, 99.9%, 99.5%, 99.9%, 95.6% and 97.6%, respectively. In case of cyanide wastewater, the metal removal, especially Ni and Zn removal were 96.5 and 95.2% at higher initial concentra- tion. For acid/alkali wastewater, metal ions removing for Cd, Cr and Fe were 99.2%, 99.5% and 99.9%, respectively. Overall, these ligands are useful for metal removal by column method from industrial wastewater especially plating wastewater.

关键词： heavy metals adsorption wastewater chelat-ing ligands plating industry

Synthesis and photoswitching properties of azobenzene liquid crystals with a pentafluorobenzene terminal

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Chinese Chemical Letters 2014年第12期25卷 1611-1614页

作者： md Lutfor Rahman Gurumuthy Hegde Shaheen M.sarkar Mashitah Mohd Yusoff Faculty of Industrial Sciences  Technology Universiti Malaysia PahangKuantan 26300Malaysia

The fluorine-substituted benzoate ester rod-shaped liquid crystals containing an azobenzene side chain linked with terminal double bonds were synthesized and *** mesophase and photoswitching properties were determined by polarizing optical microscopy（POM）,differential scanning calorimetry（DSC） and UV-visible *** rod-shaped compound 4a having an odd number of carbon atoms in the alkyl chains exhibits nematic phase and SmA type phase whereas compound 4b having an even number of carbon atoms showed only nematic *** fluorinecontaining compounds 4c and 4d showed only SmA type *** photoswitching properties of these compounds showed a rate of trans to cis isomerization ranging 19-20 s,whereas reverse process took around 230 min in *** materials may be ideal in the field of optically rewritable applications where both on and off rates should be crucial.

关键词： Liquid crystals Azobenzene Photoswitching Fluorine compounds

Two New Records of Snapper(Perciformes, Lutjanidae) from Saint Martin's Island, Bangladesh

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Journal of Ocean University of China 2021年第2期20卷 439-444页

作者： sarkar Provakar ISLAM md Jayedul HABIB AHMShafiullah NEOGI Amit Kumer HABIB Kazi Ahsan Department of Zoology Jagannath UniversityDhaka 1100Bangladesh Aquatic Bioresource Research Laboratory Department of Fisheries Biology and GeneticsSher-e-Bangla Agricultural UniversityDhaka 1207Bangladesh Department of Fisheries Biology and Genetics Faculty of FisheriesAquaculture and Marine ScienceSher-e-Bangla Agricultural UniversityDhaka 1207Bangladesh

The present work documented two snapper species, Lutjanus fulvus Forster, 1801 and Lutjanus erythropterus Bloch, 1790, recently collected from the Saint Martin's Island, Bay of Bengal, Bangladesh, during a survey on coral associated fishes of Bangladesh from July 2017 to September 2018. These two species were identified with morphological characteristics and by analyzing partial mitochondrial COI sequences. The document also included an updated checklist of snappers available in Bangladesh.

关键词： Lutjanus fulvus Lutjanus erythropterus DNA barcoding Bay of Bengal

Experimental evaluation of asphalt mixtures with emerging additives against cracking and moisture damage

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Journal of Road Engineering 2023年第4期3卷 336-349页

作者： md.Tanvir A.sarkar Mostafa A.Elseifi Department of Civil and Environmental Engineering Louisiana State UniversityBaton RougeLA 70803USA

The objective of this study was to evaluate and recommend an asphalt mixture design with emerging additive technologies that would provide superior performance against asphalt concrete(AC)stripping and *** achieve this objective,a laboratory test program was developed to evaluate the use of nanomaterials(nanoclay and graphene nanoplatelet),an emerging anti-stripping agent(adhere),and warm-mix asphalt technologies(ZycoTherm,Sasobit,and EvoTherm).Two mix types were evaluated,which were a stone-matrix asphalt(SMA)and a dense-graded binder *** addition,the modified Lottman test(AASHTO T 283)and the indirect tensile asphalt cracking test(IDEAL-CT)test were used as performance indicators of moisture damage resistance and cracking *** were analyzed statistically to identify and quantify the effects of the design variables and selected additives on the performance,moisture damage resistance,and durability of asphalt *** on the cracking test results,a superior cracking resistance performance was observed with ZycoTherm,irrespective of the mix *** had the lowest average cracking indices for both mix types,which suggest that it would not perform as well as the other additives in terms of cracking ***,SMA mixes displayed greater cracking resistance than the dense-graded mixtures,which may have been the result of the reclaimed asphalt pavement(RAP)material used in the dense-graded mix and its lower asphalt binder *** terms of moisture resistance,both nanomaterials(graphene nanoplatelet and nanoclay)did not perform well as they did not meet the minimum required tensile strength ratio(TSR)criterion(>0.80).In addition,nanomaterials showed the lowest TSR values in both mix types suggesting that their effectiveness against moisture-induced damage may not be as good as warm-mix *** the other hand,warm-mix additives were expected to show enhanced performance in terms of moisture resistance as compared to the o

关键词： Pavement Asphalt concrete Moisture damage Cracking Laboratory testing Nanomaterials

Synthesis of ion imprinted polymers for selective recognition and separation of rare earth metals

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Journal of Rare Earths 2017年第2期35卷 177-186页

作者： Mashitah M.Yusoff Nik Rohani Nik Mostapa md Shaheen sarkar Tapan Kumar Biswas md Lutfor Rahman Sazmal Effendi Arshad Mohd Sani Sarjadi Ajaykumar D.Kulkarni Faculty of Industrial Sciences and Technology University Malaysia Pahang Faculty of Science and Natural Resources Universiti Malaysia Sabah Department of Applied Sciences MIT Academy of Engineering

Lanthanide-ion imprinted polymers（L-IIPs） were synthesized by stoichiometric amounts of rare earth ions and the cavities in the polymers were created for the corresponding lanthanide ions. The maximum sorption capacities were estimated to be 125.3, 126.5, 127.6, 128.2 and 129.1 mg/g for Pr, Nd, Sm, Eu and Gd, respectively at p H 6. In the selectivity study, the L-IIPs exhibited good selectivity to the specific rare earth ions in the presence of coexisting cations. The imprinting results were found to be excellent with some rare earth ions over other competitor rare earth ions with the same charges and close ionic radius.

关键词： ion-imprinted polymers rare earths separation adsorption lanthanide-ions

Kenaf cellulose-based poly(amidoxime) ligand for adsorption of rare earth ions

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Rare Metals 2019年第3期38卷 259-269页

作者： md Lutfor Rahman Mohd Sani Sarjadi Sazmal Effendi Arshad Mashitah M. Yusoff Shaheen M. sarkar Baba Musta Faculty of Science and Natural Resources Universiti Malaysia Sabah Faculty of Industrial Sciences and Technology University Malaysia Pahang

A well-known adsorbent, poly(amidoxime)ligand, was prepared from polyacrylonitrile(PAN) grafted kenaf cellulose, and subsequent characterization was performed by Fourier transform infrared spectroscopy(FTIR),field emission scanning electron microscope(FESEM) and inductively coupled plasma mass spectrometry(ICP-MS).The adsorption capacities of the prepared ligand for rare earth metals are found to be excellent, with adsorptions of La^(3+), Ce^(3+), Pr^(3+), Gd^(3+) and Nd^(3+) experimentally determined to be 262, 255, 244, 241 and 233 mg·g^(-1), respectively, at pH 6. The experimental values of the adsorption of rare earth metals are well matched with the pseudosecond-order rate equation. The reusability of the adsorbent is examined for seven cycles of sorption/desorption,demonstrating that the proposed adsorbent could be reused for over seven cycles without any significant loss in the original removal capability of the ligand.

关键词： Adsorption Poly(amidoxime) Rare earths Separation Kenaf cellulose

Sources of Nitrogen in Combination with Systems of Irrigation Influence the Productivity of Modern Rice(Oryza sativa L.)Cultivars during Dry Season in Sub-Tropical Environment

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Phyton-International Journal of Experimental Botany 2022年第8期91卷 1687-1708页

作者： Uttam Kumer Sarker md.Romij Uddin Ahmed Khairul Hasan md.Abdur Rahman sarkar md.Abdus Salam md.Alamgir Hossain Eldessoky S.Dessoky Ismail A.Ismail Department of Agronomy Bangladesh Agricultural UniversityMymensingh2202Bangladesh Department of Crop Botany Bangladesh Agricultural UniversityMymensingh2202Bangladesh Department of Biology College of ScienceTaif UniversityTaif21944Saudi Arabia

In irrigated agricultural systems,nitrogen(N)and water are the vital resources for sustainability of the crop production in the modern era of climate *** current study aimed to assess the impact of water and N management on the productivity of irrigated rice *** the context,a field observation was done at the research farm of Bangladesh Agricultural University,Mymensingh,during dry seasons in consecutive two years(2018–2019 and 2019–2020).The experiments were set up following split-plot design assigning water management in the main plots,nitrogen management in the sub-plots,and the cultivars were approved in the split-split plot with three *** two years observation,it was revealed that rice cultivar Binadhan-8 gave the maximum value of leaf area index,number effective tillers hill-1 and grains panicle-1 which lead to the higher grain yield(GY).Substantial relationships were observed among the concentration of N,growth,total dry matter(TDM)and N content,N uptake,N utilization effectiveness,and ***,with little exception,the Combined effect of water and N,cultivars and water management were varied significantly for all ***,the results of the current study concluded that application of irrigation at 8 days after the disappearance of ponded water and source of 105 kg N ha-1 from PU+Poultry manure are the best management approach for the excellent performance of rice cultivar Binadhan-8.

关键词： Growth stage high yielding rice cultivar internal N use efficiency water productivity

Emblica officinalis improves glycemic status and oxidative stress in STZ induced type 2 diabetic model rats

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Asian Pacific Journal of Tropical Medicine 2014年第1期7卷 21-25页

作者： Aneesa Ansari md.Shahed Zaman Shahriar md.Mehedi Hassan Shukla Rani Das Begum Rokeya md.Anwarul Haque md.Enamul Haque Nirupam Biswas Tama sarkar Department of Genetic Engineering and Biolechnology Jessore Science and Technology UniversityJessoreBangladesh Department of Biotechnology and Genetic Engineering Islamic UniversityKushtiaBangladesh Department of Biomedical Science Chonbuk National University Medical SchoolJeonju 561-712South Korea Department of Biochemistry and Molecular Biology Hajee Mohammad Danesh Science & Technology UniversityDinajpurBangladesh Department of Biochemistry and Cell Biology Bangladesh Institute of Research and Rehabilitation in DiabetesEndocrine and Metabolic Disorders (BIRDEM)DhakaBangladesh Department of Biochemistry and Molecular Biology University of DhakaDhaka-1000Bangladesh Department of Nutrition and Food Sciences University of HuddersfieldHuddersfiledHD1 3DHUnited Kingdom Department of Applied Nutrition and Food Technology Islamic UniversityKushtiaBangladesh

Objective:To evaluate the antidiabetic and antioxidant potential of Emblica officinalis(***)fruit on normal and type 2 diabetic ***:Type 2 diabetes was induced into the male Long-Evans *** rats were divided into nine groups including control groups receiving water,type 2 diabetic controls,type 2 diabetic rats treated with glibenclamide(T2GT)and type 2diabetic rats treated with aqueous extract of fruit pulp of *** were fed orally for8 weeks with a single *** was collected by cutting the tail tip on 0 and 28 days and by decapitation on 56 *** red blood cells and serum were used for evaluating different biochemical ***:Four weeks administration of aqueous extract of *** improved oral glucose tolerance in type 2 rats and after 8 weeks it caused significant(P<0.007)reduction in fasting serum glucose level compared to 0 *** decreased by 14%but there was no significant change in serum ALT,creatinine,cholesterol and insulin level in any ***,reduced erythrocyte malondialdehyde level showed no significant change(P<0.07)but reduced glutathione content was found to be increased significantly(P<0.05).Conclusions:The aqueous extract of *** has a promising antidiabetic and antioxidant properties and may be considered for further clinical studies in drug development.

关键词： Antioxidant Emblica officinalis Non-insulin dependent diabetes mellitus Type 2 diabetic rats Reduced glutathione