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Watering techniques and zero-valent iron biochar pH effects on As and Cd concentrations in rice rhizosphere soils,tissues and yield

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Journal of Environmental Sciences 2021年第2期33卷 144-157页

作者： md.Shafiqul Islam Yali Chen Liping Weng Jie Ma Zulqarnain Haider khan Zhongbin Liao Abdoul salam Issiaka Abdoul Magid Yongtao Li Agro-Environmental Protection Institute/Key Laboratory for Environmental Factors Control of Agro Product Quality Safety Ministry of Agriculture and Rural AffairsTianjin 300191China College of Natural Resources and Environment South China Agricultural UniversityGuangzhou 510642China Chinese Academy of Agricutural Sciences Beijing 100081China Department of Soil Quality Wageningen Universit6700 AAWageningenNetherlands

Zero-valent iron amended biochar(ZVIB)has been proposed as a promising material in immobilizing heavy metals in paddy *** this study,the impacts of p H of ZVIB(p H 6.3 and p H 9.7)and watering management techniques(watering amount in the order of CON(control,5/72)>3/72>1-3/72>3/100>1/72,with 5/72,for example,representing irrigation given to 5 cm above soil surface in 72 hr regular interval)on As and Cd bioavailability for rice and its grain yield(Yield BR)were investigated in a pot *** rice As(As BR)content was irrelative to the watering treatments,while significantly decreased(>50%)with the addition of both ZVIB *** diminutions of brown rice Cd(Cd BR)content as well as the Yield BR were highly dependent on both the soil amendment materials’p H and watering *** all the watering treatments,3/72 treatment(15%less irrigation water than the CON)with ZVIB 6.3 amendment was the optimum fit for simultaneous reduction of As BR(50%)and Cd BR contents(19%)as well as for significant increment(12%)of the Yield *** high pH(9.7)ZVIB application could also efficiently decrease As and Cd contents in brown rice,it might risk grain yield lost if appropriate(e.g.3/72 in our study)watering management technique was not ***,ZVIB would be an environmentally friendly option as an amendment material with proper selection of watering management technique to utilize As and Cd co-contaminated arable soils safely for paddy cultivation.

关键词： Brown rice As Brown rice Cd Grain yield Paddy soils Water management Zero-valent iron biochar

Accelerated Aqueous Solubility and Antibacterial Activity of Cefuroxime Axetil Using Microcrystalline Cellulose as Carrier

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Pharmacology & Pharmacy 2020年第8期11卷 159-173页

作者： Moushumi Tabassoom salam Ashim Kumar Akito Hata Hiromu Kondo md. Abdus salam Mir Imam Ibne Wahed md. Rafiqul Islam khan Ranjan Kumar Barman Laboratory of Pharmaceutics Department of Pharmacy Faculty of Science University of Rajshahi Rajshahi Bangladesh Laboratory of Pharmaceutical Engineering & Drug Delivery Science School of Pharmaceutical Science University of Shizuoka Shizuoka Japan Department of Basic Medical Sciences Faculty of Medicine International Islamic University Malaysia Kuantan Malaysia

This investigation was undertaken to enhance the solubility and consequent antibacterial activity of cefuroxime axetil (CA), a β-lactamase-stable broad spectrum second generation cephalosporin through solid dispersion (SD) technique. For this purpose, CA loaded SDs (CSDs) were prepared by solvent evaporation method using different concentrations of microcrystalline cellulose (MCC) as carrier. The CSDs were characterized by in-vitro dissolution study, thermal analysis (DSC), crystallinity (PXRD), interactions (FTIR) and morphology (SEM). Among the formulations, CSD-2 showed the highest dissolution rate which was 2.59-fold higher than pure CA with a drug-carrier (CA: MCC) ratio of 1:3. Enhanced dissolution rate was attributed to conversion of drug from crystalline to amorphous state during preparation of SDs, which was validated by DSC, PXRD, FTIR and SEM analyses. Antibacterial activity of CSD-2 against Staphylococcus aureus (ATCC 25923) and Escherichia coli (ATCC 25922) showed 1.94- and 6.75-fold higher relative zone of inhibition (RZOI), respectively than pure CA. CSD-2 has been found to be the most effective optimized formulation in terms of both enhanced dissolution rate and antibacterial activity. Thus, it can be an effective alternative to conventional dosage forms of CA. However, further investigations are needed to validate its pharmacokinetic properties, in-vivo antibacterial efficacy and safety before recommending as a novel

关键词： Cefuroxime Axetil Dispersion Solubility Antibacterial Activity

Trace Metals Concentrations at the Atmosphere Particulate Matters in the Southeast Asian Mega City (Dhaka, Bangladesh)

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Open Journal of Air Pollution 2015年第2期4卷 86-98页

作者： md. Faridul Islam Syada Sanjida Majumd.r Abdullah Al Mamun md. Badiuzzaman khan Mohammad Arifur Rahman Abdus salam Department of Chemistry University of Dhaka Dhaka Bangladesh Department of Chemistry University of Louisville Louisville USA Department of Environment Sciences Informatics and Statistics Cà Foscari University of Venice Venice Italy Department of Environment Science Bangladesh Agricultural University Mymensingh Bangladesh

Atmospheric particulate matters were collected on quartz fibre filters for 24 hours with a low volume sampler from January 2014 to March 2014 at the Southeast Asian mega city (Dhaka, Bangladesh). Particulate matters samples were analysed for eleven trace metals with inductively coupled plasma mass spectrometer (ICP-MS) at Cà Foscari University of Venice, Italy. Trace metals were extracted from filters with digestion method using a mixture of HNO3 and H2O2. The average concentration of the determined trace metals of As, Cd, Ni, Cu, Pb, Cr, Fe, Mn, Zn, Sband Se were 3.06, 6.28, 3.77, 11.98, 305.6, 9.2, 2057.0, 42.2, 303.3, 5.47 and 2.43 ng·mǅ, respectively. Arsenic concentration is much lower in the atmosphere of Dhaka, though Bangladesh has severe arsenic problem in the ground water. Lead and cadmium concentrations showed decreasing trend in Dhaka compared than previous measurements—but still they have very high levels compared than Europe and USA. There is very limited information for Mn, Sb and Se concentrations in Dhaka air. Correlation studies showed that several trace metals had potential joint sources of origin, e.g., manganese is highly correlated with iron (r2 = 0.97) and nickel (r2 = 0.84), copper (r2 = 0.86);lead with arsenic (r2 = 0.79) and antimony (r2 = 0.78). Enrichment factors analysis was also done with the data base for the respective metals in earth crust and coal fly ash. As and Cu both have combined sources, whereas Cd, Pb and Zn were from coal fly *** metals concentrations in Dhaka city air were much higher than Europe and USA but comparable or slightly lower than other south Asian countries. This is the first extensive study for the eleven trace metals with ICP-MS in Dhaka, Bangladesh.

关键词： Atmospheric Aerosol Particulate Matter Trace Metals Arsenic Lead and Cadmium

Predicting Rainfall Using the Principles of Fuzzy Set Theory and Reliability Analysis

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American Journal of Computational Mathematics 2013年第4期3卷 337-348页

作者： Mahbub Hasan salam md. Mahbubush khan Chandrasekhar Putcha Ashraf Al-Hamd.n Chance M. Glenn College of Engineering Technology and Physical Sciences Alabama Agricultural and Mechanical University Normal USA Department of Civil & Environmental Engineering University of Alabama Huntsville USA Department of Civil and Environmental Engineering California State University Fullerton USA Department of Civil Engineering Alabama Agricultural and Mechanical University Normal USA Department of Mathematics Alabama Agricultural and Mechanical University Normal USA

The paper presents occurrence of rainfall using principles of fuzzy set theory and principles of reliability analysis. Both the abstract and the rest of the paper are discussed from these two points of view. First, a fuzzy inference model for predicting rainfall using scan data from the USDA Soil Climate Analysis Network Station at Alabama Agricultural and Mechanical University (AAMU) campus for the year 2004 is presented. The model further reflects how an expert would perceive weather conditions and apply this knowledge before inferring a rainfall. Fuzzy variables were selected based on judging patterns in individual monthly graphs for 2003 and 2004 and the influence of different variables that caused rainfall. A decrease in temperature (TP) and an increase in wind speed (WS) when compared between the ith and (i ? 1)th day were found to have a positive relation with a rainfall (RF) occurrence in most cases. Therefore, TP and WS were used in the antecedent part of the production rules to predict rainfall (RF). Results of the model showed better performance when threshold values for 1) Relative Humidity (RH) of ith day;2) Humidity Increase (HI) between the ith and (i ? 1)th day;and 3) Product (P) of decrease in temperature (TP) and an increase in wind speed (WS) were introduced. The percentage of error was 12.35 when compared the calculated amount of rainfall with actual amount of rainfall. This is followed by prediction of rainfall using principles of reliability analysis. This is done by comparing theoretical probabilities with experimental probabilities for the occurrence of two main events, namely, Relative Humidity (RH) and Humidity Increase (HI) being in between specified threshold values. The experimental values of probability are falling in between μ ? σ and μ + σ for both RH and HI parameters, where μ is the mean value and σ is the standard deviation.

关键词： Fuzzy Sets Prediction Reliability Rainfall Water Resources

Rainfall Prediction Model Improvement by Fuzzy Set Theory

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Journal of Water Resource and Protection 2013年第1期5卷 1-11页

作者： Mahbub Hasan Xingzhong (Frank) Shi Teferi Tsegaye Nesar U. Ahmed salam md. Mahbubush khan College of Agriculture Food Sciences and Sustainable Systems Kentucky State University Frankfort USA Department of Civil Engineering Alabama Agricultural and Mechanical University Normal USA Department of Mathematics Alabama Agricultural and Mechanical University Normal USA Department of Computer Science Alabama Agricultural and Mechanical University Normal USA

This paper presents the improvement of the fuzzy inference model primarily developed for predicting rainfall with data from United States Department of Agriculture (USDA) Soil Climate Analysis Network (SCAN) Station at the Alabama Agricultural and Mechanical University (AAMU) Campus for the year 2004. The primary model was developed with Fuzzy variables selected based on the degree of association of different factors with various combinations causing rainfall. An increase in wind speed (WS) and a decrease in temperature (TP) when compared between the ith and (i-1)th day were found to have a positive relation with rainfall. Results of the model showed better performance after introducing the threshold values of 1) relative humidity (RH) of the ith day;2) humidity increase (HI) when compared between the ith and (i-1)th day;and 3) product (P) of increase in wind speed (WS) and decrease in temperature (TP) when compared between the ith and (i-1)th day. In case of the improved model, errors between actual and calculated amount of rainfall (RF) were 1.20%, 2.19%, and 9.60% when using USDA-SCAN data from AAMU campus for years 2003, 2004 and 2005, respectively. The improved model was tested at William A. Thomas Agricultural Research Station (WTARS) and Bragg farm in Alabama to check the applicability of the model. The errors between the actual and calculated amount of rainfall (RF) were 3.20%, 5.90%, and 1.66% using USDA-SCAN data from WATARS for years 2003, 2004, and 2005, respectively. Similarly, errors were 10.37%, 11.69%, and 25.52% when using SCAN data from Bragg farm for years 2004, 2005, and 2006, respectively. The primary model yielded the value of error equals 12.35% using USDA- SCAN data from AAMU campus for 2004. The present model performance was proven to be better than the primary model.

关键词： Fuzzy Sets Prediction Rainfall Water Resources

Anaortic Off-Pump Complete Arterial Revascularization Using Composite LIMA RIMA Y Sequential 5 Grafts in a Patient with Triple Vessel Disease Performed in a Low Resource Country: A Case Report

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World Journal of Cardiovascular Surgery 2021年第12期11卷 125-132页

作者： Asraful Hoque Romena Rahman Abu Shadat Mohammad Saem khan md. Abdullah Yusuf Muhammad Asif Ahsan Chowdhury Imran Ahmed Wahida salam md. Monzur Hossain Tanvir Hossain Department of Cardiac Surgery National Institute of Cardiovascular Diseases Dhaka Bangladesh Department of Microbiology National Institute of Neurosciences and Hospital Dhaka Bangladesh

The use of bilateral internal thoracic arteries to treat coronary artery disease is very less despite of improved long-term survival. In this case report, a patient presented with TVD has been managed with anaortic off-pump complete arterial revascularization (OPCABG) by using composite LIMA RIMA Y Sequential 5 grafts to achieve complete arterial revascularization successfully. This type of operative procedure is technically difficult in a resource poor country like Bangladesh. However, this has been done by a group of young cardiac surgeon. During follow up, the patient is in a good condition.

关键词： Anaortic Off-Pump Complete Arterial Revascularization Composite LIMA RIMA Y Sequential 5 Grafts Triple Vessel Disease Low Resource Country