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Effect of salinity and acidity on bioleaching activity of mesophilic and extremely thermophilic bacteria

中国有色金属学会会刊：英文版 2008年第3期18卷 714-721页

作者： h.deveci M.A.JORDAN N.POWELL I.ALP Department of Mining Engineering Karadeniz Technical UniversityTrabzon 61080Turkey Camborne School of Mines UECTremough CampusPenrynCornwallTR109EZUK

The effects of bacterial strain, salinity and ph on the bioleaching of a complex ore using mesophilic and extremely thermophilic bacteria were investigated and the statistical analysis of the results was performed using ERGUN’s test. The extreme thermophiles were shown to display superior kinetics of dissolution of zinc compared with the mesophiles as confirmed by the statistical analysis. Bioleaching performance of the extreme thermophiles is found to improve in response to the increase in acidity (ph from 2.0 to 1.0) whilst the activity of the mesophiles is adversely affected by decreasing ph. Statistical analysis of the bioleaching data indicates that the effect of ph is insignificant in the range of ph 1.0-1.2 for the extreme thermophiles and ph 1.4-2.0 for the mesophiles. Salinity is shown to have a suppressing effect on the mesophiles. however, the extreme thermophiles appear to be halophilic in character as they could operate efficiently under saline conditions (1%-4%Cl- (w/v)).

关键词：细菌生物浸取盐度 ph 硫化物

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Treatment of copper-rich gold ore by cyanide leaching, ammonia pretreatment and ammoniacal cyanide leaching

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Transactions of Nonferrous Metals Society of China 2015年第2期25卷 597-607页

作者： A.D.BAS E.KOC Y.E.YAZICI h.deveci hydromet-B&PM Group Division of Mineral & Coal Processing Department of Mining EngineeringKaradeniz Technical University

The treatment of a copper sulphide-bearing gold ore by direct cyanide leaching, ammonia pretreatment and ammoniacal cyanide leaching was investigated. Dissolution behaviour of gold and copper in these leaching systems was demonstrated. Severe interference by the copper containing sulphides with cyanide leaching of gold is observed at p（NaCN）〈5 g/L. This is consistent with speciation calculations. Ammonia pretreatment is shown to readily eliminate the copper interference, allowing almost complete extraction of gold with concomitantly low reagent consumption in subsequent cyanide leaching. In ammoniacal cyanide system, Box-Behnken experimental design shows the main and interaction effects of Nh3, NaCN and Pb（NO3）2. The concentrations of Nh3 and NaCN are statistically confirmed to be significant factors affecting extraction of gold while the effect of Pb（NO3）2 is limited. Increasing the concentration of Nh3 improves the selectivity and extent of gold extraction and reduces the cyanide consumption. The contribution of reagent interactions to gold extraction is statistically insignificant. These findings highlight that ammonia pretreatment and ammonia-cyanide leaching are promising approaches for the treatment of gold ores with high copper sulphide content.

关键词： copper-gold ores ammoniacal cyanide leaching ammonia leaching pretreatment cyanide leaching

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CARDIORESPIRATORY EFFECTS OF LA- TANOPROST AND BETAXOLOL IN PA-TIENTS WITh PRIMARY OPEN ANGLE GLAUCOMA

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国际眼科杂志 2003年第1期3卷 37-38页

作者： E.F.Erkin P.Celik O.Kayikcioglu h.deveci A.Sakar Faculty of Medicine Celal Bayar University TurkeyFaculty of Medicine Celal Bayar University TurkeyFaculty of Medicine Celal Bayar University TurkeyFaculty of Medicine Celal Bayar University TurkeyFaculty of Medicine Celal Bayar University Turkey

Purpose: The assess cardiorespiratory changes in primary open angle glaucoma (POAG) palients using latanoprost or betaxoloL Methods: Thirty newly diagnosed POAG patients without any systemic diseases were randomly div... 详细信息

关键词：原发性开角型青光眼患者拉担前列素倍他洛尔药理作用心肺功能

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Combination of allopurinol and hyperbaric oxygen therapy:A new treatment in experimental acute necrotizing pancreatitis?

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World Journal of Gastroenterology 2007年第46期13卷 6203-6207页

作者： Bilgin Comert Ahmet Turan Isik Sezai Aydin Ergun Bozoglu Bulent Unal Salih.deveci Nuket Mas Esref Cinar Mehmet Refik Mas Division of Intensive Care Departments of Internal MedicineGulhane School of MedicineAnkara 06018Turkey Division of Geriatric Medicine Department of Internal MedicineGulhane School of MedicineAnkara 06018Turkey Department of Surgery Guven HospitalA.AyranciAnkara 06018Turkey Department of Surgery Numune Training HospitalSihhiyeAnkara 06018Turkey Department of Pathology Gulhane School of MedicineAnkara 06018Turkey Department of Anatomy Medical FacultyBaskent UniversityAnkara 06018Turkey Department of Infection Disease Gulhane School of MedicineAnkara 06018Turkey Department of Internal Medicine Gulhane School of MedicineAnkara 06018Turkey

AIM： To investigate the individual and combined effects of allopurinol and hyperbaric oxygen （hBO） therapy on biochemical and histopathological changes, oxidative stress, and bacterial translocation （BT） in the experimental rat acute pancreatitis （AP）. METhODS： Eighty-five Sprague-Dawley rats were included in the study. Fifteen of the eighty-five rats were used as controls （sham, Group I ）. AP was induced via intraductal taurocholate infusion in the remaining seventy rats. Rats that survived to induction of acute necrotizing pancreatitis were randomized into four groups. Group h received saline, Group m allopurinol, Group IV allopurinol plus hBO and Group v hBO alone. Serum amylase levels, oxidative stress parameters, BT and histopathologic scores were determined. RESULTS： Serum amylase levels were lower in Groups Ⅲ, Ⅳ and v compared to Group h （974 ± 110, 384 ± 40, 851 ＋ 56, and 1664 Ⅳ 234 U/L, respectively, P 〈 0.05, for all）. Combining the two treatment optionsrevealed significantly lower median [25-75 percentiles] histopathological scores when compared to individual administrations （13 [12.5-15] in allopurinol group, 9.5 [7-11.75] in hBO group, and 6 [4.5-7.5] in combined group, P 〈 0.01）. Oxidative stress markers were significantly better in all treatment groups compared to the controls. Bacterial translocation into the pancreas and mesenteric lymph nodes was lower in Groups m, iV and v compared to Group h （54%, 23%, 50% vs 100% for translocation to pancreas, and 62%, 46%, 58% vs 100% for translocation to mesenteric lymph nodes, respectively, P 〈 0.05 for all）. CONCLUSION： The present study confirms the benefit of hBO and allopurinol treatment when administered separately in experimental rat AP. Combination of these treatment options appears to prevent progression of pancreatic injury parameters more effectively.

关键词： Experimental pancreatitis AIIopurinol hyperbaric oxygen

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