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Bioleaching of copper from pre and post thermally activated low grade chalcopyrite contained ball mill spillage

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Frontiers of Environmental Science & Engineering 2013年第2期7卷 281-293页

作者： sandeep panda Nilotoala PRADHAN Umaballav MOHAPATRA sandeep K. panda Swagat S.RATH Danda S. RAO Bansi D. NAYAK Lala B. SUKLA Barada K. MISHRA CSIR-Institute of Minerals and Materials Technology Bhubaneswar 751013 India Department of Botany North Orissa University Baripada 757003 India Regional Center of Central Tuber Crops Research Institute Bhubaneswar 751019 India

Bioleaching of a low grade chalcopyrite （ball mill spillage material） was tested for copper recovery in shake flasks. The original samples （as received） were thermally activated （600℃, 30 min） to notice the change in physico-chemical and mineralogical characteristics of the host rock and subsequently its effect on copper recovery. A mixed culture of acidophilic chemolithotrophic bacterial consortium predominantly entailing Acidithiobacillus fer- rooxidans strain was used for bioleaching studies and optimization of process parameters of both original and thermally activated samples. Mineralogical characteriza- tion studies indicated the presence of chalcopyrite, pyrite in the silicate matrix of the granitic rock. Field emission scanning electron microscopy coupled with Energy dispersive spectroscopy （FESEM-EDS） and X-ray Fluor- escence （XRF） analysis indicated mostly SiO2. With pH 2, pulp density 10% w/v, inoculum 10% v/v, temperature 30~C, 150 ***-~, 49% copper could be recovered in 30 days from the finest particle size （- 1 ~ 0.75 mm） of the original spillage sample. Under similar conditions 95% copper could be recovered from the thermally activated sample with the same size fraction in 10 days. The study revealed that thermal activation leads to volume expansion in the rock with the development of cracks, micro and macro pores on its surface, thereby enabling bacterial solution to penetrate more easily into the body, facilitating enhanced copper dissolution.

关键词： ball mill spillage thermal activation bioleaching copper

利用嗜酸混合菌从尼日利亚闪锌矿和方铅矿中生物浸出Zn(Ⅱ)和Pb(Ⅱ)(英文)

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Transactions of Nonferrous Metals Society of China 2011年第11期21卷 2535-2541页

作者： Alafara A.BABA Folahan A.ADEKOLA Rasaq F.ATATA Risikat N.AHMED sandeep panda Department of Chemistry University of Ilorin Department of Biological Sciences Fountain University Department of Microbiology University of Ilorin Bioresources Engineering Department Institute of Minerals and Materials Technology

利用嗜酸混合菌在尼日利亚闪锌矿和方铅矿中生物浸出Zn(Ⅱ)和Pb(Ⅱ),研究pH值和铁离子对闪锌矿和方铅矿浸出率的影响。结果表明:闪锌矿和方铅矿中Zn(Ⅱ)和Pb(Ⅱ)的氧化物在pH值分别为2.1和2.7时浸出效果最好。用模拟的琼脂糖培养基使细... 详细信息

利用嗜酸混合菌在尼日利亚闪锌矿和方铅矿中生物浸出Zn(Ⅱ)和Pb(Ⅱ),研究pH值和铁离子对闪锌矿和方铅矿浸出率的影响。结果表明:闪锌矿和方铅矿中Zn(Ⅱ)和Pb(Ⅱ)的氧化物在pH值分别为2.1和2.7时浸出效果最好。用模拟的琼脂糖培养基使细胞分泌出含铁离子的外聚合物,以此加强氧化。闪锌矿和方铅矿达到氧化平衡分别需要3和4d。闪锌矿和方铅矿在1d内的浸出率分别为38.3%和34.2%,5d内Zn(Ⅱ)和Pb(Ⅱ)分别还原92.0%和89.0%。使用XRD研究两种矿物的未浸出的剩余产物,闪锌矿的组成为S、ZnSO4和少量Ca3Al2O6,方铅矿的组成为S、PbSO4和少量的Pb(S,Ge)(O,OH)4和Pb8Co(Si2O7)3。

关键词：闪锌矿方铅矿 Zn(Ⅱ) Pb(Ⅱ) 氧化嗜酸菌

Limb length discrepancy after total knee arthroplasty: A systematic review and meta-analysis

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World Journal of Clinical Cases 2021年第2期9卷 357-371页

作者： Sujit Kumar Tripathy Siddharth Satyakam Pradhan Paulson Varghese Prabhudev Prasad Purudappa sandeep Velagada Tarun Goyal Bijnya Birajita panda Jagadeesh Vanyambadi Department of Orthopaedics All India Institute of Medical SciencesBhubaneswar 751019OdishaIndia Department of Orthopedics VA Boston Health careBostonMassachusetts 02130United States Department of Orthopaedics All India Institute of Medical SciencesBathinda 209201India Department of Ophthalmology SCB Medical CollegeCuttack 751019India Department of Orthopaedics Salford Royal NHS Foundation TrustSalford M68HDUnited Kingdom

BACKGROUND Limb length discrepancy(LLD)after total knee arthroplasty(TKA)has been considered as one of the reasons for the unsatisfactory ***,there is no consensus about the extent of LLD that can be considered as clinically *** To evaluate the incidence of radiographic LLD and its impact on functional outcome following *** All randomized-controlled trial and observational studies on LLD in TKA,published till 22nd June 2020,were systematically searched and *** primary outcome was“limb lengthening or LLD after TKA”.The secondary outcomes included“assessment of LLD in varus/valgus deformity”and“impact of LLD on the functional outcome”.RESULTS Of 45 retrieved studies,qualitative and quantitative assessment of data was performed from eight studies and six studies,*** studies(n=1551)reported the average limb lengthening of 5.98 *** LLD after TKA was ranging from 0.4±10 mm to 15.3±2.88 *** incidence of postoperative radiographic LLD was reported in 44%to 83.3%of *** was no difference in the preoperative and postoperative LLD(MD-1.23;95%CI:-3.72,1.27;P=0.34).Pooled data of two studies(n=219)revealed significant limb lengthening in valgus deformity than varus(MD-2.69;95%CI:-5.11,0.27;P=0.03).The pooled data of three studies(n=611)showed significantly worse functional outcome in patients with LLD of≥10 mm compared to<10 mm(standard MD 0.58;95%CI:0.06,1.10;P=0.03).CONCLUSION Limb lengthening after TKA is common,and it is significantly more in valgus than varus *** LLD(≥10 mm)is associated with suboptimal functional outcome.

关键词： Arthroplasty Knee Replacement Limb length Joint diseases Surgery

Effect of exogenous progesterone on cumulus characteristics of buffalo oocytes by allowing passage of more number of sperm through cumulus but not essentially fertilization

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Asian pacific Journal of Reproduction 2018年第2期7卷 79-86页

作者： Madhusmita panda Asmita sandeep Kumar Purusottam Mishra Mahesh Chandra Sahu Sachinandan De Tirtha Kumar Datta Rakesh Kumar Nodal Officer Chief District Veterinary OfficeKadambedaBhadrak756100OdishaIndia Institute of Microbial Technology Council of Scientific and Industrial ResearchChandigarhIndia BSL-4 National Institute of VirologySus RoadPashanPune-411021India Goat Breeding Farm AT/PO-SalapadaDistrict-KeonjharPin code-758020State-OdishaIndia Directorate of Medical Research IMS and SUM HospitalSiksha'O'Anusandhan UniversityK8Kalinga NagarBhubaneswar-751003OdishaIndia Animal Biotechnology Centre National Dairy Research InstituteKarnal132001HaryanaIndia

Objective:To understand the level of progesterone (P4) in different quality of buffalo cumulus oocyte complexes (COCs) and further to evaluate the effect of exogenous P4 supplementation on maturation and subsequent developmental ability of poor quality brilliant cresyl blue (BCB-)***: Progesterone secreted by different quality of buffalo oocytes was estimated by enzyme linked immunosorbent assay and the concentration differences were translated into P4 doses to be incorporated in the maturation medium of BCB-ve COCs followed by expression analysis of genes involved in the cumulus expansion, extracellular matrix disintegration and progesterone receptor signalling. In addition, the study also evaluated the effect of exogenous P4 on sperm-cumulus interaction. Results: More than 10-fold up-regulated expression of progesterone receptor in P4 supplemented oocytes signified that P4 might be acting predominantly through this receptor. Also, exogenous P4 supplementation had significant effect on transcatheter arterial chemoembolization protease regulated by P4-progesterone receptor pathway which in turn had an important role in extracellular matrix disintegration. On the contrary, cumulus expansion genesHAS2,TNFAIP6,AREG were not altered upon P4 supplementation. Also, it was observed that P4 addition did facilitate passage of significantly more number of spermatozoa through P4 treated cumulus cells. Further, incorporation of different doses of P4 did not improve significantly the cleavage and blastocyst rates of BCB-ve ***: Different qualities of buffalo COCs secrete substantially diverse levels of P4, and its supplementation has a role in oocyte maturation via modulation of cumulus characteristics but perhaps not fertilization.

关键词： BCB screening Progesterone Sperm cumulus interaction Fertilizing ability

Thirty-day mortality of patients with hip fracture during COVID-19 pandemic and pre-pandemic periods:A systematic review and metaanalysis

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World Journal of Orthopedics 2021年第1期12卷 35-50页

作者： Sujit Kumar Tripathy Paulson Varghese Sibasish Panigrahi Bijnya Birajita panda sandeep Velagada Samrat Smrutiranjan Sahoo Monappa A Naik Sharath K Rao Department of Orthopedics All India Institute of Medical SciencesBhubaneswar 751019India Department of Orthopedics All India Institute of Medical SciencesBhubaneswarBhubaneswar 751019India Department of Ophthalmology SCB Medical CollegeCuttack 753007India Department of Orthopedics All India Institute of Medical SciencesNagpur 441108India Department of Orthopedics Kasturba Medical CollegeManipal Academy of Higher EducationManipalUdupiKarnataka 576104India Department of Orthopedics Kasturba Medical CollegeManipal Academy of Higher EducationManipalUdupiKarnatakaManipal 576104India

BACKGROUND Timely intervention in hip fracture is essential to decrease the risks of perioperative morbidity and ***,limitations of the resources,risk of disease transmission and redirection of medical attention to a more severe infective health problem during coronavirus disease 2019(COVID-19)pandemic period have affected the quality of care even in a surgical *** To compare the 30-d mortality rate and complications of hip fracture patients treated during COVID-19 pandemic and pre-pandemic *** The search of electronic databases on 1st August 2020 revealed 45 studies related to mortality of hip fracture during the COVID-19 pandemic and pre-pandemic *** careful screening,eight studies were eligible for quantitative and qualitative analysis of *** The pooled data of eight studies(n=1586)revealed no significant difference in 30-d mortality rate between the hip fracture patients treated during the pandemic and pre-pandemic periods[9.63%vs 6.33%;odds ratio(OR),0.62;95%CI,0.33,1.17;P=0.14].Even the 30-d mortality rate was not different between COVID-19 non-infected patients who were treated during the pandemic time,and all hip fracture patients treated during the pre-pandemic period(OR,1.03;95%CI,0.61,1.75;P=0.91).A significant difference in mortality rate was observed between COVID-19 positive and COVID-19 negative patients(OR,6.99;95%CI,3.45,14.16;P<0.00001).There was no difference in the duration of hospital stay(OR,-1.52,95%CI,-3.85,0.81;P=0.20),overall complications(OR,1.62;P=0.15)and incidence of pulmonary complications(OR,1.46;P=0.38)in these two-time ***,the preoperative morbidity was more severe,and there was less use of general anesthesia during the pandemic *** There was no difference in 30-d mortality rate between hip fracture patients treated during the pandemic and pre-pandemic ***,the mortality risk was higher in COVID-19 positive patients compared to COVID-19 negativ

关键词： Hip fracture Femur neck fracture Trochanter fracture Mortality Pandemic COVID-19