【摘 要】
：
[背景]高效的生物浸出与微生物介导活跃的铁硫代谢紧密关联,低品位辉铜矿(Cu2S)铁代谢匮乏严重制约其效能.[目的]强化铁硫代谢及“接触”机制改善低品位辉铜矿生物浸出.[方法]基于自主筛选的嗜酸杆菌属(Acidiphilium sp.)及双层平板筛选的嗜铁钩端螺旋菌(Leptospirillum ferriphilum),与硫氧化菌喜温嗜酸硫杆菌(Acidithiobacillus caldus)协作,加以Fe2+/Fe3+-黄铁矿-纤维质废弃物酸解液(废-废资源利用)干预,系统分析浸出生化参数差异性.[
【机 构】
：
江南大学生物工程学院教育部工业微生物技术重点实验室 江苏无锡214122;江南大学食品科学与技术学院国家功能食品工程研究中心 江苏无锡214122
论文部分内容阅读
[背景]高效的生物浸出与微生物介导活跃的铁硫代谢紧密关联,低品位辉铜矿(Cu2S)铁代谢匮乏严重制约其效能.[目的]强化铁硫代谢及“接触”机制改善低品位辉铜矿生物浸出.[方法]基于自主筛选的嗜酸杆菌属(Acidiphilium sp.)及双层平板筛选的嗜铁钩端螺旋菌(Leptospirillum ferriphilum),与硫氧化菌喜温嗜酸硫杆菌(Acidithiobacillus caldus)协作,加以Fe2+/Fe3+-黄铁矿-纤维质废弃物酸解液(废-废资源利用)干预,系统分析浸出生化参数差异性.[结果]扫描电子显微镜(Scanning Electron Microscope,SEM)结果表明矿渣表面大量微孔及坑壑,表明活跃的菌体作用;傅立叶变换红外光谱仪(Fourier Transform Infrared Spectroscopy,FTIR)揭示N-H、C=O、O-H等键与胞外聚合物(Extracelluler Polymer Substance,EPS)紧密相关,S=O、C-O-S等吸收峰波动表明更剧烈的硫代谢;激光共聚焦扫描显微镜(Confocal Laser Scanning Microscope,CLSM)结果表明优化体系呈现更多附着细胞及EPS,为“接触”机制奠定基础,浸出40 d游离/附着细胞量分别提高2.51倍及5.73倍,最大比生长速率(μmax)出现时间提前1.5-5.3 d,最高浸出率达67.6％.[结论]铁氧化/还原菌及外源含铁物质干预强化浸出体系铁硫代谢加速矿物溶解,酸解液促进铁元素循环及菌体生长,附着细胞及EPS分泌增多强化“接触”机制从而有效改善浸出微环境和效能.
其他文献
This paper presents an ultra-low noise L-band radio astronomical cryogenic receiver for the Five-hundred-meter Aperture Spherical radio Telescope (FAST) telescope.The development of key low noise microwave parts of coupling low noise amplifier (Coupling-L
Employing the stellar evolution code Modules for Experiments in Stellar Astrophysics (MESA),we calculate yields of heavy elements from massive stars via stellar wind and core-collapse supernova(CCSN) ejecta to the interstellar medium (ISM).In our models,t
So far quite a few ultraluminous X-ray (ULX) pulsars have been discovered.In this work,we construct a super-Eddington,magnetic accretion disk model to estimate the dipole magnetic field of eight ULX pulsars based on their observed spin-up variations and l
The East Asian Very Long Baseline Interferometry (VLBI) Network (EAVN) is a rapidly evolving international VLBI array that is currently promoted under joint efforts among China,Japan and Korea.EAVN aims at forming a joint VLBI Network by combining a large
The molecular-rich atmospheres of M type stars complicate our understanding to their atmospheric properties.Recently,great progress has been made in atmospheric modeling of M-type stars,and we take advantage of the updated BT-Settl model grid to develop a
A new ephemeris,period change analysis and light curve modeling of the W UMa-type eclipsing binary BF Pav are presented in this study.Light curves of the system taken in BVRI filters from two observatories,in Australia and Argentina,were modeled using the
We investigate the infall properties in a sample of 11 infrared dark clouds (IRDCs) showing blue-asymmetry signatures in HCO+ J=1-0 line profiles.We used JCMT to conduct mapping observations in HCO+J=4-3 as well as single-point observations in HCO+J=3-2,t
Modern wide-field high-cadence surveys have revealed the significant diversity of optical transient phenomena in their luminosity and timescale distributions,which led to the discovery of some mysterious fast optical transients (FOTs).These FOTs can usual
To investigate the effects of massive star evolution on surrounding molecules,we select nine massive clumps previously observed with the Atacama Pathfinder Experiment (APEX) telescope and the Submillimeter Array (SMA) telescope.Based on the observations o
[背景]溶藻弧菌(Vibrio alginolyticus)能够感染鱼、虾、贝等海洋经济动物,给海水养殖业带来了严重的经济损失,对公众健康及食品安全也构成较大威胁.[目的]通过研究乌梅(Fructus mume)对溶藻弧菌的抑菌效应及其机理,为乌梅在水产养殖中的进一步开发利用提供理论依据.[方法]采用试管二倍稀释法测定乌梅提取物(Fructus mume Extract,FME)对溶藻弧菌的最小抑菌浓度(Minimal Inhibitory Concentration,MIC)和最小杀菌浓度(Minimu