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| 1 | Biosorption characteristics of unicellular green alga Chlorella sorokiniana immobilized in loofa sponge for removal of Cr(Ⅲ)显示文摘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 rnicroalgal 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 Langrnuir 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 HNO_3,while other desorbing agents were less effective in the order:EDTA>H_2SO_4>CH_3COOH>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. | AKHTAR Nasreen IQBAL Muhammad ZAFAR Saeed Iqbal IQBAL Javed | 2008 | Journal of Environmental Sciences2008，20，2： | 20 |
| 2 | Antibiotic resistance and cagA gene correlation:A looming crisis of Helicobacter pylori显示文摘AIM:To determine antibiotic resistance of Helicobacter pylori(H.pylori) in Pakistan and its correlation with host and pathogen associated factors.METHODS:A total of 178 strains of H.pylori were isolated from gastric biopsies of dyspeptic patients.Susceptibility patterns against first and second-line antibiotics were determined and trends of resistance were analyzed in relation to the sampling period,gastric conditions and cagA gene carriage.The effect of cagA gene on the acquisition of resistance was investigated by mutant selection assay.RESULTS:The observations showed that monoresistant strains were prevalent with rates of 89% for metronidazole,36% for clarithromycin,37% for amoxicillin,18.5% for ofloxacin and 12% for tetracycline.Furthermore,clarithromycin resistance was on the rise from 2005 to 2008(32% vs 38%,P = 0.004) and it is significantly observed in non ulcerative dyspeptic patients compared to gastritis,gastric ulcer and duodenal ulcer cases(53% vs 20%,18% and 19%,P = 0.000).On the contrary,metronidazole and ofloxacin resistance were more common in gastritis and gastric ulcer cases.Distribution analysis and frequencies of resistant mutants in vitro correlated with the absence of cagA gene with metronidazole and ofloxacin resistance.CONCLUSION:The study confirms the alarming levels of antibiotic resistance associated with the degree of gastric inflammation and cagA gene carriage in H.pylori strains. | Adnan Khan Amber Farooqui Hamid Manzoor Syed Shakeel Akhtar Muhammad Saeed Quraishy Shahana Urooj Kazmi | 2012 | World Journal of Gastroenterology2012，18，18： | 15 |
| 3 | An autoregressive integrated moving average model for short-term prediction of hepatitis C virus seropositivity among male volunteer blood donors in Karachi,Pakistan显示文摘AIM:To identify the stochastic autoregressive integrated moving average(ARIMA)model for short term forecasting of hepatitis C virus(HCV)seropositivity among volunteer blood donors in Karachi,Pakistan.METHODS:Ninety-six months(1998-2005)data on HCV seropositive cases(1000 -1 ×month -1)among male volunteer blood donors tested at four major blood banks in Karachi,Pakistan were subjected to ARIMA modeling.Subsequently,a fitted ARIMA model was used to forecast HCV seropositive donors for 91-96 mo to contrast with observed series of the same months.To assess the forecast accuracy,the mean absolute error rate(%)between the observed and predicted HCV seroprevalence was calculated.Finally,a fitted ARIMA model was used for short-term forecasts beyond the observed series.RESULTS:The goodness-of-fit test of the optimum A R I M A(2,1,7)model showed non-significant autocorrelations in the residuals of the model.The forecasts by ARIMA for 91-96 mo closely followed the pattern of observed series for the same months,with mean monthly absolute forecast errors(%)over 6 mo of 6.5%.The short-term forecasts beyond the observed series adequately captured the pattern in the data and showed increasing tendency of HCV seropositivity with a mean±SD HCV seroprevalence(1000-1×month-1) of 24.3±1.4 over the forecast interval.CONCLUSION:To curtail HCV spread,public health authorities need to educate communities and health care providers about HCV transmission routes based on known HCV epidemiology in Pakistan and its neighboring countries.Future research may focus on factors associated with hyperendemic levels of HCV infection. | Saeed Akhtar Shafquat Rozi | 2009 | World Journal of Gastroenterology2009，15，13： | 9 |
| 4 | Chlorella sorokiniana immobilized on the biomatrix of vegetablesponge of luffa cylin1 drica: a new system to remove cadmium from contaminat1 ed aqueous medium 显示文摘 | Akhtar N Saeed A Iqbal M | 2003 | Bioresource Technology2003，81，2： | 1 |
| 5 | Population beliefs about the efficacy of injections in Pakistan’s Sindh province显示文摘 | Naveed Z. Janjua Yvan J. Hutin Saeed Akhtar Khabir Ahmad | 2006 | Public Health2006，，9： | 1 |
| 6 | Synthesis and characterization of some novel aromatic polyimides显示文摘 | Saeed Butt M Akhtar Z Zafar-uz-Zarnan M | 2005 | Eur Polym J2005，41，7： | 1 |
| 7 | Removal and recovery of lead(Ⅱ) from single and multimetal (Cd,Cu,Ni,Zn) solutions by crop milling waste (black gram husk)显示文摘 | SAEED A IQBAL M AKHTAR M W | 2005 | Journal of Hazardous Materials2005，117，1： | 1 |
| 8 | Petiolar fehsheath of palm: a new biosorbent for the removal of heavy metals from contaminated water 显示文摘 | IQBAL M SAEED A AKHTAR N | 2002 | Biores Technol2002，81，2： | 1 |
| 9 | Removal and recovery of lead(lI) from single and multimetal (Cd, Cu, Ni, Zn) solutions by crop milling waste (black gram husk) 显示文摘 | SAEED A IQBAL M AKHTAR M W | 2005 | Hazard Mater2005，117，1： | 1 |
| 10 | Cblorella sorokiniana immobilized on the biomatrix of vegetable sponge of luffa cylindrical:a new system to removecadmi um from contaminated aqueous medium 显示文摘 | Asreen Akhtar Asma Saeed Muhammed Iqbal | 2003 | Bioresource Technology2003，88，2： | 1 |
| 11 | Chlorella sorokiniana immobilized on the biomatrix of vegetable sponge of Luffa cylindrical : A new system to remove cadmium from contaminated aqueous medium 显示文摘 | Akhtar N Saeed A Iqbal M | 2003 | Bioresour Tecbnol2003，88，2： | 1 |
| 12 | Removal and recovery of heavy metals from aqueous solution using papaya wood as a new biosorbent 显示文摘 | SAEED A AKHTAR M W 1QBAL M | 2005 | Separation and Purification Technology2005，45，： | 1 |
| 13 | Removal and recovery of heavy metals from aqueous solution using papaya wood as a new biosorbent 显示文摘 | SAEED A AKHTAR M W IQBAL M | 2005 | Sep Purif Technol2005，45，1： | 1 |
| 14 | Removal and recovery of lead ( II ) from single and multimetal ( Cd, Cu, Ni, Zn) solutions by crop milling waste (black gram husk)显示文摘 | Saeed A lqbal M Akhtar M W | 2005 | J Hazard Mater2005，117，1： | 1 |
| 15 | Removal and recoveryof lead(11) from single and multimetal (Cd, Cu, Ni, Zn) solutions by crop milling waste (black gram husk)显示文摘 | Saeed A Iqbal M Akhtar M W | 2005 | Journal of Hazardous Materials2005，117，1： | 1 |
| 16 | Application of Zinc, Iron and Boron Enhances Productivity and Grain Biofortification of Mungbean显示文摘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 poor.Agronomic biofortification of pulses with Zn,Fe,and boron(B)offers a pragmatic solution to combat hidden hunger instead of food fortification and supplementation.Moreover,it also has positive effects on crop production as well.Therefore,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 mungbean.Soil 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,respectively.Foliar application in these experiments was done at 0.3%Zn,0.2%Fe and 0.1%B respectively one week after flowering initiation.Data 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,respectively.Foliar 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,respectively.It 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. | 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 | 2023 | Phyton-International Journal of Experimental Botany2023，92，4： | 0 |
| 17 | Synthesis of metal oxide composite nanosheets and their pressure sensing properties显示文摘This study presents the synthesis of metal oxides composite nanosheets(oxides of cobalt, zinc and iron) and their pressure sensing properties. A transducer has been fabricated to directly measure the resistance–pressure and impedance–pressure relationships of pristine nanopowder. At the initial stage, a nanopowder sample of 10 mm diameter and 1 mm height was placed in the transducer and by applying pressure of up to 8.15 kN/m2;the DC resistance and the impedance are reduced by 44% on average. It can be explained by the densification of the samples and a decrease in porosity due to the effect of pressure. It was also observed that the DC resistance increases with time and saturated within 8 min. It is considered that this phenomenon is based on the effect of displacement currents of bound charges. The dependences of the impedance phase(θ) on frequency and pressure have also been investigated. | Muhammad Tariq Saeed Chani Sher Bahadar Khan Kh.S.Karimov M.Abid Abdullah M.Asiri Kalsoom Akhtar | 2015 | Journal of Semiconductors2015，36，2： | 0 |
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