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Biosorption characteristics of unicellular green alga Chlorella sorokiniana immobilized in loofa sponge for removal of Cr(Ⅲ)

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Journal of Environmental Sciences 2008年第2期20卷 231-239页

作者： AKHTAR Nasreen iqbal Muhammad zafar saeed iqbal iqbal Javed Department of Biology Government lslamia College for WomenCooper RoadLahore-54550Pakistan. Environment Biotechnology Group Biotechnology and Food Research CentrePCSIR Laboratories ComplexLahore-54600Pakistan. School of Biological Sciences University of PunjabLahore-54570Pakistan.

Loofa sponge （LS） immobilized biomass of Chlorella sorokiniana （LSIBCS）, isolated from industrial wastewater, was investigated as a new biosorbent for the removal of Cr（Ⅲ） from aqueous solution. A comparison of the biosorption of Cr（Ⅲ） by LSIBCS and free biomass of C. sorokiniana （FBCS） from 10-300 mg Cr（Ⅲ）/L aqueous solutions showed an increase in uptake of 17.79% when the microalgal biomass was immobilized onto loofa sponge. Maximum biosorption capacity for LSIBCS and FBCS was found to be 69.26 and 58.80 mg Cr（Ⅲ）/g biosorbent, respectively, whereas the amount of Cr（Ⅲ） ions adsorbed onto naked LS was 4.97 mg/g. The kinetics of Cr（Ⅲ） biosorption was extremely rapid and equilibrium was established in about 15 and 20 min by LSIBCS and FBCS, respectively. The biosorption equilibrium was well defined by Langmuir adsorption isotherm model. The biosorption kinetics followed the pseudo-second order kinetic model. The biosorption was found to be pH dependent and the maximum sorption occurred at the solution pH 4.0. Desorption studies showed that 98% of the adsorbed Cr（Ⅲ） could be desorbed with 0.1 mol/L HNO3, while other desorbing agents were less effective in the order： EDTA 〉 H2SO4 〉 CH3COOH 〉 HCl. The regenerated LSIBCS retained 92.68% of the initial Cr（Ⅲ） binding capacity up to five cycles of reuse in continuous flow-fixed bed columns. The study revealed that LSIBCS could be used as an effective biosorbent for the removal of Cr（Ⅲ） from wastewater.

关键词： biosorption immobilization loofa sponge Chlorella sorokiniana Cr(Ⅲ) desorption fixed bed column reactor

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Relative Time Quantum-based Enhancements in Round Robin Scheduling

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Computer Systems Science & Engineering 2022年第5期41卷 461-477页

作者： Sardar zafar iqbal Hina Gull Saqib saeed Madeeha Saqib Mohammed Alqahtani Yasser A.Bamarouf Gomathi Krishna May Issa Aldossary Department of Computer Information Systems College of Computer Science and Information TechnologyImam Abdulrahman Bin Faisal UniversityP.O.Box No.1982DammamSaudi Arabia

Modern human life is heavily dependent on computing systems and one of the core components affecting the performance of these systems is underlying operating *** systems need to be upgraded to match the needs of modern-day systems relying on Internet of Things,Fog computing and Mobile based *** scheduling algorithm of the operating system dictates that how the resources will be allocated to the processes and the Round Robin algorithm(RR)has been widely used for *** intent of this study is to ameliorate RR scheduling algorithm to optimize task *** have carried out an experimental study where we have developed four variations of RR,each algorithm considers three-time quanta and the performance of these variations was compared with the RR algorithm,and results highlighted that these variations performed better than conventional RR *** the future,we intend to develop an automated scheduler that can determine optimal algorithm based on the current set of processes and will allocate time quantum to the processes intelligently at the run *** way the task performance of modern-day systems can be improved to make them more efficient.

关键词： CPU scheduling Round Robin enhanced Round Robin relative time quantum operating systems

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Energy Theft Detection in Smart Grids with Genetic Algorithm-Based Feature Selection

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Computers, Materials & Continua 2023年第3期74卷 5431-5446页

作者： Muhammad Umair zafar saeed Faisal saeed Hiba Ishtiaq Muhammad Zubair Hala Abdel Hameed Faculty of Information Technology University of Central PunjabLahore54590Pakistan DAAI Research Group Department of Computing and Data ScienceSchool of Computing and Digital TechnologyBirmingham City UniversityBirmingham B47XGUK Faculty of Computer and Information Systems Fayoum University63514Egypt Khaybar Applied College Taibah UniversitySaudi Arabia

As big data,its technologies,and application continue to advance,the Smart Grid(SG)has become one of the most successful pervasive and fixed computing platforms that efficiently uses a data-driven approach and employs efficient information and communication technology(ICT)and cloud *** a result of the complicated architecture of cloud computing,the distinctive working of advanced metering infrastructures(AMI),and the use of sensitive data,it has become challenging tomake the SG *** of the SG are categorized into two main categories,Technical Losses(TLs)and Non-Technical Losses(NTLs).Hardware failure,communication issues,ohmic losses,and energy burnout during transmission and propagation of energy are ***’s are human-induced errors for malicious purposes such as attacking sensitive data and electricity theft,along with tampering with AMI for bill reduction by fraudulent *** research proposes a data-driven methodology based on principles of computational intelligence as well as big data analysis to identify fraudulent customers based on their load *** our proposed methodology,a hybrid Genetic Algorithm and Support Vector Machine(GA-SVM)model has been used to extract the relevant subset of feature data from a large and unsupervised public smart grid project dataset in London,UK,for theft detection.A subset of 26 out of 71 features is obtained with a classification accuracy of 96.6%,compared to studies conducted on small and limited datasets.

关键词： Big data data analysis feature engineering genetic algorithm machine learning

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Application of Zinc, Iron and Boron Enhances Productivity and Grain Biofortification of Mungbean

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Phyton-International Journal of Experimental Botany 2023年第4期92卷 983-999页

作者： Muhammad zafar Siraj Ahmed Muhammad Kashif Munir Nawal zafar Muhammad Saqib Muhammad Aleem Sarwar Saba iqbal Baber Ali Naveed Akhtar Basharat Ali Sadam Hussain Muhammad saeed Mohammad Khalid Al-Sadoon Aneela Gulnaz Agronomic Research Institute Ayub Agricultural Research Institute FaisalabadFaisalabad38000Pakistan Soil and Water Testing Laboratory Ayub Agricultural Research Institute FaisalabadFaisalabad38000Pakistan Department of Plant Sciences Quaid-i-Azam UniversityIslamabad45320Pakistan Department of Agricultural Engineering Khwaja Fareed University of Engineering and TechnologyRahim Yar Khan64200Pakistan College of Agronomy Northwest A&F UniversityYangling712100China Plant Pathology Research Institute Faisalabad38000Pakistan Department of Zoology College of ScienceKing Saud UniversityRiyadh11451Saudi Arabia Department of Biotechnology Yeungnam UniversityGyeongsan38641Korea

Deficiencies of essential vitamins,iron(Fe),and zinc(Zn)affect over one-half of the world’s population.A significant progress has been made to control micronutrient deficiencies through supplementation,but new approaches are needed,especially to reach the rural *** biofortification of pulses with Zn,Fe,and boron(B)offers a pragmatic solution to combat hidden hunger instead of food fortification and ***,it also has positive effects on crop production as ***,we conducted three separate field experiments for two consecutive years to evaluate the impact of soil and foliar application of the aforementioned nutrients on the yield and seed biofortification of *** application of Zn at 0,4.125,8.25,Fe at 0,2.5,5.0 and B at 0,0.55,1.1 kg ha−1 was done in the first,second and third experiment,*** application in these experiments was done at 0.3%Zn,0.2%Fe and 0.1%B respectively one week after flowering *** revealed that soil-applied Zn,Fe and B at 8.25,5.0 and 1.1 kg ha−1,respectively,enhanced the grain yield of mungbean;however,this increase in yield was statistically similar to that recorded with Zn,Fe and B at 4.125,2.5 and 0.55 kg ha−1,*** application of these nutrients at flower initiation significantly enhanced the Zn contents by 28%and 31%,Fe contents by 80%and 78%,while B contents by 98%and 116%over control during 2019 and 2020,*** was concluded from the results that soil application of Zn,Fe,and B enhanced the yield performance of mungbean;while significant improvements in seed Zn,Fe,and B contents were recorded with foliar application of these nutrients.

关键词： Biofortification seed biofortification mungbean iron zinc boron foliar application

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TrFAST: A Tool to Predict Signaling Pathway-specific Transcription Factor Binding Sites

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Genomics, Proteomics & Bioinformatics 2012年第6期10卷 354-359页

作者： Umair Seemab Qurrat ul Ain Muhammad Sulaman Nawaz zafar saeed Sajid Rashid National Centre for Bioinformatics Quaid-i-Azam University Department of Computer Science Quaid-i-Azam University

Recent advances in the development of high-throughput tools have significantly revolutionized our understanding of molecular mech- anisms underlying normal and dysfunctional biological processes. Here we present a novel computational tool, transcription factor search and analysis tool （TrFAST）, which was developed for the in silico analysis of transcription factor binding sites （TFBSs） of sig- naling pathway-specific TFs. TrFAST facilitates searching as well as comparative analysis of regulatory motifs through an exact pattern matching algorithm followed by the graphical representation of matched binding sites in multiple sequences up to 50 kb in length. TrFAST is proficient in reducing the number of comparisons by the exact pattern matching strategy. In contrast to the pre-existing tools that find TFBS in a single sequence, TrFAST seeks out the desired pattern in multiple sequences simultaneously. It counts the GC con- tent within the given multiple sequence data set and assembles the combinational details of consensus sequence（s） located at these regions, thereby generating a visual display based on the abundance of unique pattern. Comparative regulatory region analysis of multi- ple orthologous sequences simultaneously enhances the features of TrFAST and provides a significant insight into study of conservation of non-coding cis-regulatory elements. TrFAST is freely available at http：//***/***.

关键词： TrFAST Transcription factor binding sites in silico analysis Signaling pathway Pattern searching

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Humidity sensing properties of CU_2O-PEPC nanocomposite films

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Journal of Semiconductors 2012年第7期33卷 11-15页

作者： Kh.S.Karimov M.Saleem Z.M.Karieva A.Mateen M.Tariq saeed Chani Q.zafar GIK Institute of Engineering Sciences and Technology Topi-23640District SwabiKPKPakistan Physical Technical Institute of Academy of Sciences Rudaki Ave.33Dushanbe734025Tajikistan Government College of Science Wahdat RoadLahore-54570Pakistan Tajik Technical University Rajabov St.10Dushanbe 734000Tajikistan COMSATS Institute of Information Technology IslamabadPakistan

A blend of copper oxide nanopowder （Cu2O）, 3 wt.%, and poly-N-epoxypropylcarbazole （PEPC）, 2 wt.%, in benzol was drop-casted on glass substrates with pre-deposited surface-type silver electrodes for the fabrication of Cu20-PEPC nanocomposite thin films. The thicknesses of the Cu20-PEPC films were in the range of 10-13 μm. The effect of humidity on the electrical properties of the nanocomposite films was investigated by measuring the capacitance and dissipation of the samples at two different frequencies of the applied voltage： 120 Hz and 1 kHz. The AC resistance of the samples was determined from the dissipation values, and the DC resistance was measured directly. The effect of ageing on the humidity sensing properties of the nanocomposite was observed. After ageing, it was observed that at 120 Hz and 1 kHz, under a humidity of up to 86% RH, the capacitance of the cell increased by 85 and 8 times, and the resistance decreased by 345 and 157 times, accordingly, with respect to 30% RH conditions. It was found that with an increase in frequency, the capacitance and resistance of the samples decreased. It is assumed that the humidity response of the cell is associated with the diffusion of water vapors and doping of the semiconductor nanocomposite by water molecules.

关键词： cuprous oxide composite nano-powder poly-N-epoxypropylcarbazole humidity sensor

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Quality of life of COVID-19 recovered patients:a 1-year follow-up study from Bangladesh

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Infectious Diseases of Poverty 2023年第4期12卷 101-102页

作者： Mohammad Delwer Hossain Hawlader Md Utba Rashid Md Abdullah saeed Khan Mowshomi Mannan Liza Sharmin Akter Mohammad Ali Hossain Tajrin Rahman Sabrina Yesmin Barsha Alberi Afifa Shifat Mosharop Hossian Tahmina Zerin Mishu Soumik Kha Sagar Ridwana Maher Manna Nawshin Ahmed Sree Shib Shankar Devnath Debu Irin Chowdhury Samanta Sabed Mashrur Ahmed Sabrina Afroz Borsha Faraz Al zafar Sabiha Hyder Abdullah Enam Habiba Babul Naima Nur Miah Md.Akiful Haque Shopnil Roy K.M.Tanvir Hassan Mohammad Lutfor Rahman Mohammad Hayatun Nabi Koustuv Dalal Department of Public Health North South University Dhaka Bangladesh International Centre for Diarrhoeal Disease Research Bangladesh Dhaka Bangladesh National Institute of Preventive and Social Medicine Dhaka Bangladesh Ibn Sina Medical College Hospital Dhaka Bangladesh Public Health Promotion and Development Society (PPDS) Dhaka Bangladesh Covid Vaccine Coordination Cell Directorate General of Health Services (DGHS) Dhaka Bangladesh Institute of Statistical Research and Training (ISRT) University of Dhaka Dhaka Bangladesh School of Health Sciences Division of Public Health Science Mid Sweden University Sundsvall Sweden

BackgroundThe COVID-19 pandemic posed a danger to global public health because of the unprecedented physical,mental,social,and environmental impact affecting quality of life(QoL).The study aimed to find the changes in QoL among COVID-19 recovered individuals and explore the determinants of change more than 1 year after recovery in low-resource ***-19 patients from all eight divisions of Bangladesh who were confirmed positive by reverse transcription-polymerase chain reaction from June 2020 to November 2020 and who subsequently recovered were followed up twice,once immediately after recovery and again 1 year after the first *** follow-up study was conducted from November 2021 to January 2022 among 2438 individuals using the World Health Organization Quality of Life Brief Version(WHOQOL-BREF).After excluding 48 deaths,95 were rejected to participate,618 were inaccessible,and there were 45 cases of incomplete *** statistics,paired-sample analyses,generalized estimating equation(GEE)analysis,and multivariable logistic regression analyses were performed to test the mean difference in participants’QoL scores between the two *** participants(n=1710,70.1%)were male,and one-fourth(24.4%)were older than *** average physical domain score decreased significantly from baseline to follow-up,and the average scores in psychological,social,and environmental domains increased significantly at follow-up(P<0.05).By the GEE equation approach,after adjusting for other factors,we found that older age groups(P<0.001),being female(P<0.001),having hospital admission during COVID-19 illness(P<0.001),and having three or more chronic diseases(P<0.001),were significantly associated with lower physical and psychological QoL *** age and female sex[adjusted odd ratio(aOR)=1.3,95%confidence interval(CI)1.0–1.6]were associated with reduced social domain scores on multivariable logistic regression *** or semi-urban peo

关键词： Quality of life Health-related quality of life Reverse transcription-polymerase chain reaction COVID-19 Bangladesh

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Polyimides Based on Flexible Diamines:Synthesis, Characterization and Thermal Properties

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复旦学报（自然科学版） 2007年第5期46卷 617-页

作者： M.saeed Butt Zareen Akhtar M.zafar-uz-Zaman Arshad Munir Department of Chemistry Quaid-i-Azam UniversityIslamabad-45320 Pakistan National Engineering and Scientific Commission P.O.Box 2801 Islamabad Pakistan

1 Results and DiscussionTwo diamines 1,4-phenylene di(oxy-4,4′-aniline) and 4-aminophenyloxy-N-4-[(4-amiophenyloxy)benzylidene]aniline were prepared via the nucleopilic substitution reaction and were polymerized with 3,3′,4,4′-benzophenonetetracarboxylic acid dianhydride (BP), 4,4′-(hexafluoroisopropylidene)diphthalic anhydride (HF) , 3,4,9,10-perylenetetracarboxylic acid dianhydride (PD) and pyromellitic dianhydride (PMDA) either by one step solution polymerization reaction or two step procedure. The l...

关键词： polyimides ether diamines solubility thermal stability

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Colon mucosal neoplasia referred for endoscopic mucosal resection:Recurrence of adenomas and prediction of submucosal invasion

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World Journal of Gastrointestinal Endoscopy 2020年第7期12卷 198-211页

作者： Mamoon Ur Rashid Neelam Khetpal Hammad zafar saeed Ali Evgeny Idrisov Yuan Du Assaf Stein Deepanshu Jain Muhammad Khalid Hasan Department of Internal Medicine Advent Health Graduate Medical EducationOrlandoFL 32804United States Department of Internal Medicine Univerity of Iowa hospitalIowa CityIA 52242United States Department of Gastroenterology University of Oklahoma Health SciencesOklahomaOK 73104United States Center for Interventional Endoscopy AdventHealthOrlandoFL 32803United States

BACKGROUND Endoscopic mucosal resection(EMR)is an effective and minimally invasive alternative to surgery for large polyps and laterally spreading *** morphology and surface characteristics may help predict submucosal invasion of the lesion(SMIL)during endoscopic *** is one of the largest singlecenter studies reporting endoscopic mucosal resection for larger(≥20 mm)colorectal lesions in the United *** To determine the recurrence rate of adenomas and endoscopic features that may predict submucosal invasion of colonic mucosal *** This is a retrospective cohort study of all the patients referred for endoscopic mucosal resection for lesions≥20 mm,spanning a period from January 2013 to February *** main outcome measure was identifying features that may predict submucosal invasion of mucosal lesions and predict recurrence of adenomas on follow-up surveillance colonoscopy performed at 4-6 *** A total of 480 patients with 500 lesions were included in the *** median age was 68(Inter quantile range:14)with 52%*** most common lesion location was ascending colon(161;32%).Paris classification 0-IIa(Flat elevation of mucosa-316;63.2%);Kudo Pit Pattern IIIs(192;38%)and Granular surface morphology(260;52%)were most *** invasion was present in 23(4.6%)out of 500 *** independent risk factors for SMIL were Kudo Pit Pattern IIIL+IV and V(Odds ratio:4.5;P value40 mm).Almost all recurrences(98.8%)were treated endoscopically.

关键词： Endoscopy Polyp Endoscopic mucosal resection Recurrence Submucosal invasion

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Intrinsic Bio-Enhancer Entities of <i>Fagonia cretica</i>for Synthesis of Silver Nanoparticles Involves Anti-Urease, Anti-Oxidant and Anti-Tyosinase Activity

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Advances in Bioscience and Biotechnology 2019年第12期10卷 455-468页

作者： Aqsa Yousaf Ayesha zafar Muhammad Ali Snober Mona Bukhary Yasmeen Manzoor Tuba Tariq Asma saeed Muhammad Akram Faryal Bukhari Muhammad Abdullah Syeda Sadaf Zehra Shahbaz Gul Hassan Murtaza Hasan Department of Biochemistry and Biotechnology The Islamia University Bahawalpur Pakistan Department of Biological Sciences Gomal University Dera Ismail Khan Pakistan Department of Chemistry The Islamia University Bahawalpur Pakistan Cholistan Institute of Desert Studies (CIDS) The Islamia University Bahawalpur Pakistan Department of Botany The Islamia University Bahawalpur Pakistan College of Information Science and Engineering Zhongkai University of Agriculture and Engineering Guangzhou China

Objective: Evaluating the bio-reducing activity and various potential, annotates the biological entitties of Fagonia cretica. Method: By fractionating the crude extract with different ethanol-water fraction mixture. This substantiates the reduction potential for the biological synthesis of AgNPs, its antioxidant, anti-urease and anti-Tyrosinase activity. Results: UV-visible spectra confirm the bio-reducing potential for Ag NPs with the optimized 50% ethanol-water fraction mixture. Transmission electron microscopy (TEM) confirmed the round shaped AgNPs with an average size of 16 nm in optimized 50% fraction mixture. Further evaluating Ethanol-water fraction with 90% and 70% of plant extract showed more potentials for Anti-Tyrosinase and Anti-urease activity. Moreover, diluted 30% fraction exhibits two folds higher Anti-oxidant and Anti urease activity. Conclusion: Overall, this work showed that 50% Ethanol-water fraction has potentially active molecules (among all fractions) primarily involved in bio-reducing potential of Ag NPs and enzymatic assay while 90% mixture proved to be least active. This study suggested electing the optimum mixture fraction of 50% ethanol-water in order to screen the bioactive compounds and to inculcate their activity status for clinical trials.

关键词： Bioactivity Fagonia cretica Nanoparticles Enzymes Assay Bio Reducing Agent

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