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| 1 | Extraction and characterization of alumina nanopowders from aluminum dross by acid dissolution process显示文摘A significant amount of aluminum dross is available as a waste in foundry industries in Bangladesh. In this study, alumina was extracted from aluminum dross collected from two foundry industries situated in Dhamrai and Manikgang, near the capital city, Dhaka. Aluminum dross samples were found to approximately contain 75wt% Al2O3 and 12wt% SiO2. An acid dissolution process was used to recover the alumina value from the dross. The effects of various parameters, e.g., temperature, acid concentration, and leaching time, on the extraction of alumina were studied to optimize the dissolution process. First, Al(OH)3 was produced in the form of a gel. Calcination of the Al(OH)3 gel at 1000°C, 1200°C, and 1400°C for 2 h produced θ-Al2O3,(α+θ)-Al2O3, and α-alumina powder, respectively. Thermal characterization of the Al(OH)3 gel was performed by thermogravimetric/differential thermal analysis(TG/DTA) and differential scanning calorimetry(DSC). The phases and crystallite size of the alumina were determined by X-ray diffraction analysis. The dimensions of the alumina were found to be on the nano level. The chemical compositions of the aluminum dross and alumina were determined by X-ray fluorescence(XRF) spectroscopy. The microstructure and morphology of the alumina were studied with scanning electron microscopy. The purity of the alumina extracted in this study was found to be 99.0%. Thus, it is expected that the obtained alumina powders can be potentially utilized as biomaterials. | Saifur Rahman Sarker Zahangir Alam Rakibul Qadir M A Gafur Mohammad Moniruzzaman | 2015 | International Journal of Minerals,Metallurgy and Materials2015，22，4： | 20 |
| 2 | Cytokine profile in Egyptian hepatitis C virus genotype-4 in relation to liver disease progression显示文摘AIM: To observe the imbalance between T helper cell Th1 and Th2 cytokines in several chronic hepatitis disease at different stages of disease progression.METHODS: We measured the cytokine levels of Th1 (IL-2 and IL-2R), Th2 (IL-10) and the pro-inflammatory cytokines (IL-6 and IL-6R and TNF and TNF-RⅠ and Ⅱ)by the ELISA technique in the sera of 33 hepatocellular carcinoma (HCC) patients and 20 chronic liver disease (CLD) patients. In addition, 20 asymptomatic hepatitis C virus carriers and 20 healthy subjects negative for hepatitis C virus(HCV) markers served as controls.RESULTS: Anti-HCV antibodies were found to be positive in 94% of HCC cases and 75% of CLD cases.On the other hand, HCV viremia was detected using RTPCR in 67% of HCC cases and 65% of CLD cases. HBsAg was positive in 9% of HCC cases and 30% of CLD cases.Also bilharzial-Ab was positive in 55% of HCC cases,65% of CLD cases and in 70% of asymptomatic carriers (ASC). HCC patients had significantly higher values of IL-2R, TNF-RⅡ (P<0.001), and TNF-RⅠ (P>0.05), but lower TNFα (P<0.001) and IL-6 (P = 0.032) in comparison to ASC. But, in comparison to non-cancer controls, HCC patients had higher values of IL-2R, IL-6R, TNF-RⅠ and TNF-RⅡ, but lower TNF-α (P<0.001). CLD patients had higher IL-2R, TNF-RⅠ, and TNF-RⅡ (P<0.001) than ASC. But, in comparison to non-cancer controls, CLD patients had higher values of IL-2R, TNF-RⅠ and TNF-RⅡ, but lower TNF-α (P<0.001). IL-10 was higher (though not significantly) in HCC and CLD patients than in symptomatic carriers and non-cancer controls.CONCLUSION: Liver disease progression from CLD to HCC due to HCV genotype-4 infection is associated with an imbalance between Th1 and Th2 cytokines. IL-2R,TNF-RⅠ, and TNF-RⅡ could be used as potential markers. | Abdel-Rahman N Zekri Mohammed S El-Din Ashour Ahmed Hassan Hanaa M Alam El-Din Amal MR El-Shehaby Maha A Abu-Shady | 2005 | World Journal of Gastroenterology2005，11，42： | 4 |
| 3 | MHD free and forced convection boundary layer flow along a vertical porous plate显示文摘 | Hossaln M A Alam K C A Rees D A S | 1997 | Appl Mech Engrg1997，2，1： | 1 |
| 4 | Reliability analysis and full - scale testing of transmission tower显示文摘 | Alam M J Santhakumar A R | 1994 | Journal of Structural Engineering ASCE1994，122，3： | 1 |
| 5 | Heme oxygenase-1/carbon monoxide: from basic science to therapeutic applications显示文摘 | Ryter S W Alam J Choi A M K | 2006 | Physiological Reviews2006，86，： | 1 |
| 6 | The Processes of Location Study for Developing Economic Zones under Public Private Partnership Model: Country Study on Bangladesh显示文摘 | Alam M Rashed A | 2014 | Journal of Economics and Business Research2014，17，2： | 1 |
| 7 | Influence of common purslane aqueous extracts on germination and seedling growth of rice显示文摘 | Alam S M Khan M A Mujtaba S M | 2004 | Pakistan Journal of Scientific and Industrial Research2004，47，4： | 1 |
| 8 | Embedded Capaci- tors in Printed Wiring Board:A Technological Review显示文摘 | Alam M A Azarian M H Pecht M G | 2012 | Journal of Electronic Materials2012，41，8： | 1 |
| 9 | Effect of planting tlmes,maturlty stages and iba in stem cuttings of bougainvillea (Bougainvilleas spectabilis ) 显示文摘 | Habib M A Alam K H Khanam M H A etal | 2007 | International Journal of Sustainable Agricultural Technology2007，3，4： | 1 |
| 10 | New soluble n-type conjugated copolymer for light-emitting diodes显示文摘 | Tonzola C J Alam M M Jenekhe S A | 2002 | Adv Mater2002，14，： | 1 |
| 11 | Antibody response and pathological change in immunosuppressed chicks immunized and challenged against Newcastle disease显示文摘 | Alam K M T Lslam M A Rahmam M M | 1997 | Bangladesh Vet J1997，31，1： | 1 |
| 12 | Gonadal Sex Differentiation in the Malabar Grouper, Epinephelus Mala barieus 显示文摘 | MURATA R KARIMATA H ALAM M A | 2009 | AQUACULTURE2009，293，34： | 1 |
| 13 | Efficacy and safety of Saccharo- myces boulardii in acute childhood diarrhea: A double blind ran- domised controlled trial 显示文摘 | Riaz M Alam S Malik A | 2012 | Indian J Pediatr2012，79，4： | 1 |
| 14 | Pregnenolone derivatives as potential anticancer agents 显示文摘 | CHOUDHARY M I ALAM M S RAHMAN A | 2011 | Steroids2011，76，14： | 1 |
| 15 | Transport Properties of Hydroxide and Proton Conducting Membranes 显示文摘 | Hibbs M R Hickner M A Alam T M | 2008 | Chem Mater2008，20，7： | 1 |
| 16 | Analysis of active and reactive power control of a stand alone PEM fuel cell power plant显示文摘 | El-Sharkh M Y Rahman A Alam M S | 2004 | IEEE Transactions on Power Systems2004，19，4： | 1 |
| 17 | Analysis of thermal conduction in carbon Ioams显示文摘 | DRUMA A ALAM M DRUMA C | 2004 | International Journal of Thermal Sciences2004，43，7： | 1 |
| 18 | Effect of transport at ambient temperature on detection and isolation of Vibrio cholerae from environmental samples 显示文摘 | Alam M Sadique A Bhuiyan NA | 2006 | Applied and Environmental Microbiology2006，72，3： | 1 |
| 19 | Arsenic and heavy metal contamination of vegetables grown in Samta village,Bangladesh显示文摘 | Alam M G Snow E T Tanaka A | 2003 | Science of the Total Environment2003，308，13： | 1 |
| 20 | Enteric protein loss and intestinal permeability changes in children during acute shigellosis and after recovery:effect of zinc supplementation显示文摘 | Alam A N Sarker S A Wahed M A | 1994 | Gut1994，35，12： | 1 |
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