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https://www.readbyqxmd.com/read/28439295/production-of-high-concentration-n-caproic-acid-from-lactate-through-fermentation-using-a-newly-isolated-ruminococcaceae-bacterium-cpb6
#1
Xiaoyu Zhu, Yan Zhou, Yi Wang, Tingting Wu, Xiangzhen Li, Daping Li, Yong Tao
BACKGROUND: n-Caproic acid (CA), as a medium-chain carboxylic acid, is a valuable chemical feedstock for various industrial applications. The fermentative production of CA from renewable carbon sources has attracted a lot of attentions. Lactate is a significant intermediate waste in the anaerobic breakdown of carbohydrates that comprise 18-70% of the chemical oxygen demand (COD) in municipal and some industrial wastewaters. Recently, researchers (including our own group) reported the CA production using lactate as electron donor with newly identified microbiome systems...
2017: Biotechnology for Biofuels
https://www.readbyqxmd.com/read/28438268/fungal-biorecovery-of-gold-from-e-waste
#2
Saskia Bindschedler, Thi Quynh Trang Vu Bouquet, Daniel Job, Edith Joseph, Pilar Junier
Waste electric and electronic devices (e-waste) represent a source of valuable raw materials of great interest, and in the case of metals, e-waste might become a prized alternative source. Regarding gold, natural ores are difficult to mine due to their refractory nature and the richest ores have almost all been exploited. Additionally, some gold mining areas are present in geopolitically unstable regions. Finally, the gold mining industry produces toxic compounds, such as cyanides. As a result, the gold present in e-waste represents a nonnegligible resource (urban mining)...
2017: Advances in Applied Microbiology
https://www.readbyqxmd.com/read/28435492/applying-systems-engineering-reduces-radiology-transport-cycle-times-in-the-emergency-department
#3
Benjamin A White, Brian J Yun, Michael H Lev, Ali S Raja
INTRODUCTION: Emergency department (ED) crowding is widespread, and can result in care delays, medical errors, increased costs, and decreased patient satisfaction. Simultaneously, while capacity constraints on EDs are worsening, contributing factors such as patient volume and inpatient bed capacity are often outside the influence of ED administrators. Therefore, systems engineering approaches that improve throughput and reduce waste may hold the most readily available gains. Decreasing radiology turnaround times improves ED patient throughput and decreases patient waiting time...
April 2017: Western Journal of Emergency Medicine
https://www.readbyqxmd.com/read/28433915/stimulation-of-the-anaerobic-digestion-of-the-dry-organic-fraction-of-municipal-solid-waste-ofmsw-with-carbon-based-conductive-materials
#4
Yan Dang, Dezhi Sun, Trevor L Woodard, Li-Ying Wang, Kelly P Nevin, Dawn E Holmes
Growth of bacterial and archaeal species capable of interspecies electron exchange was stimulated by addition of conductive materials (carbon cloth or granular activated carbon (GAC)) to anaerobic digesters treating dog food (a substitute for the dry-organic fraction of municipal solid waste (OFMSW)). Methane production (772-1428mmol vs <80mmol), volatile solids removal (78%-81% vs 54%-64%) and COD removal efficiencies (∼80% vs 20%-30%) were all significantly higher in reactors amended with GAC or carbon cloth than controls...
April 9, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28431336/beam-induced-back-streaming-electron-suppression-analysis-for-an-accelerator-type-neutron-generator-designed-for-40-ar-39-ar-geochronology
#5
Cory Waltz, Mauricio Ayllon, Tim Becker, Lee Bernstein, Ka-Ngo Leung, Leo Kirsch, Paul Renne, Karl Van Bibber
A facility based on a next-generation, high-flux D-D neutron generator has been commissioned and it is now operational at the University of California, Berkeley. The current generator designed for (40)Ar/(39)Ar dating of geological materials produces nearly monoenergetic 2.45MeV neutrons at outputs of 10(8)n/s. The narrow energy range is advantageous relative to the (235)U fission spectrum neutrons due to (i) reduced (39)Ar recoil energy, (ii) minimized production of interfering argon isotopes from K, Ca, and Cl, and (iii) reduced total activity for radiological safety and waste generation...
April 13, 2017: Applied Radiation and Isotopes
https://www.readbyqxmd.com/read/28429122/quantifying-golgi-structure-using-em-combining-volume-sem-and-stereology-for-higher-throughput
#6
REVIEW
Sophie Ferguson, Anna M Steyer, Terry M Mayhew, Yannick Schwab, John Milton Lucocq
Investigating organelles such as the Golgi complex depends increasingly on high-throughput quantitative morphological analyses from multiple experimental or genetic conditions. Light microscopy (LM) has been an effective tool for screening but fails to reveal fine details of Golgi structures such as vesicles, tubules and cisternae. Electron microscopy (EM) has sufficient resolution but traditional transmission EM (TEM) methods are slow and inefficient. Newer volume scanning EM (volume-SEM) methods now have the potential to speed up 3D analysis by automated sectioning and imaging...
April 20, 2017: Histochemistry and Cell Biology
https://www.readbyqxmd.com/read/28419977/investigation-of-as-v-removal-from-acid-mine-drainage-by-iron-hydr-oxide-modified-zeolite
#7
Pfano Mathews Nekhunguni, Nikita Tawanda Tavengwa, Hlanganani Tutu
In this work, the synthesis of iron (hydr) oxide modified zeolite was achieved through precipitation of iron on the zeolite. The structure and surface morphology of iron (hydr) oxide modified zeolite (IHOMZ) was studied by scanning electron microscopy (SEM), coupled with an energy-dispersive X-ray spectroscopy (EDX), and Fourier transform infrared (FT-IR) spectra. The efficiency of IHOMZ was then investigated through batch technique for the extraction of As(V) from mine waste water. The optimum parameters for maximum As(V) adsorption were: an initial As(V) concentration (10 mg L(-1)), adsorbent dosage (3...
April 15, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28415554/phytosynthesis-of-silver-nanoparticles-using-aqueous-leaf-extracts-of-lippia-citriodora-antimicrobial-larvicidal-and-photocatalytic-evaluations
#8
Elias E Elemike, Damian C Onwudiwe, Anthony C Ekennia, Richard C Ehiri, Nnaemeka J Nnaji
Nanoscience and nanotechnology represent new and enabling platforms that promise to provide broad range of novel and improved technologies for environmental, biological and other scientific applications. This study reports the synthesis of silver nanoparticles mediated by aqueous leaf extract of Lippia citriodora at two different temperatures of 50°C and 90°C. The synthesis of colloidal silver nanoparticles (AgNPs) was monitored by the use of UV-visible spectroscopy at different temperatures and time intervals...
June 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28414947/application-of-pyrolysis-to-recycling-organics-from-waste-tantalum-capacitors
#9
Bo Niu, Zhenyang Chen, Zhenming Xu
Tantalum capacitors (TCs) are widely used in electronic appliances. The rapid replacement of electronic products results in generating large amounts of waste TCs (WTCs). WTCs, rich in valuable tantalum, are considered as high quality tantalum resources for recycling. However, environmental pollution will be caused if the organics of WTCs were not properly disposed. Therefore, effectively recycling the organics of WTCs is significant for recovering the valuable parts. This study proposed an argon (Ar) pyrolysis process to recycle the organics from WTCs...
April 9, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28414427/enhancing-extracellular-electron-transfer-of-shewanella-oneidensis-mr-1-through-coupling-improved-flavin-synthesis-and-metal-reducing-conduit-for-pollutant-degradation
#10
Di Min, Lei Cheng, Feng Zhang, Xue-Na Huang, Dao-Bo Li, Dong-Feng Liu, Tai-Chu Lau, Yang Mu, Han-Qing Yu
Dissimilatory metal reducing bacteria (DMRB) are capable of extracellular electron transfer (EET) to insoluble metal oxides, which are used as external electron acceptors by DMRB for their anaerobic respiration. The EET process has important contribution to environmental remediation mineral cycling, and bioelectrochemical systems. However, the low EET efficiency remains to be one of the major bottlenecks for its practical applications for pollutant degradation. In this work, Shewanella oneidensis MR-1, a model DMRB, was used to examine the feasibility of enhancing the EET and its biodegradation capacity through genetic engineering...
April 21, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28412098/supply-and-demand-of-some-critical-metals-and-present-status-of-their-recycling-in-weee
#11
REVIEW
Shengen Zhang, Yunji Ding, Bo Liu, Chein-Chi Chang
New development and technological innovations make electrical and electronic equipment (EEE) more functional by using an increasing number of metals, particularly the critical metals (e.g. rare and precious metals) with specialized properties. As millions of people in emerging economies adopt a modern lifestyle, the demand for critical metals is soaring. However, the increasing demand causes the crisis of their supply because of their simple deficiency in the Earth's crust or geopolitical constraints which might create political issues for their supply...
April 12, 2017: Waste Management
https://www.readbyqxmd.com/read/28404509/recycled-tetrahedron-like-cucl-from-waste-cu-scraps-for-lithium-ion-battery-anode
#12
Hongying Hou, Yuan Yao, Song Liu, Jixiang Duan, Qishu Liao, Chengyi Yu, Dongdong Li, Zhipeng Dai
The wide applications of metal Cu inevitably resulted in a large quantity of waste Cu materials. In order to recover the useful Cu under the mild conditions and reduce the environmental emission, waste Cu scraps were recycled in the form of CuCl powders with high economic value added (EVA) via the facile hydrothermal route. The recycled CuCl powders were characterized in terms of scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX) and X-ray diffraction (XRD). The results suggested that the recycled CuCl powders consisted of many regular tetrahedron-like micro-particles...
April 9, 2017: Waste Management
https://www.readbyqxmd.com/read/28403748/a-cost-effective-method-of-atelo-collagen-type-1-3-col1-3-isolation-from-human-placenta-and-its-in-vitro-characterization-in-2d-and-3d-cell-culture-applications
#13
Johannes Hackethal, Severin Mühleder, Alexandra Hofer, Karl Heinrich Schneider, Johanna Prüller, Simone Hennerbichler, Johann Eibl, Heinz Redl, Andreas Herbert Teuschl
Pepsin-solubilized atelocollagen can be used to form highly complex three-dimensional matrices for a broad spectrum of tissue engineering applications. Moreover, it has a long history as a favorable biomaterial in pharmaceutical and medical industries. So far, the main sources for these approaches are collagens from xenogenic sources. Yet, these non-human collagens carry a risk of provoking immune reactions in patients. Here, we describe an effective method of isolating atelocollagen type 1/3 (COL1/3) from human placenta...
April 12, 2017: Tissue Engineering. Part C, Methods
https://www.readbyqxmd.com/read/28400158/a-novel-process-for-separation-of-polycarbonate-polyvinyl-chloride-and-polymethyl-methacrylate-waste-plastics-by-froth-flotation
#14
Chong-Qing Wang, Hui Wang, Luo-Luo Huang
A novel process was proposed for separation of ternary waste plastics by froth flotation. Pretreatment of plastics with potassium permanganate (KMnO4) solution was conducted to aid flotation separation of polycarbonate (PC), polyvinyl chloride (PVC) and polymethyl methacrylate (PMMA) plastics. The effect of pretreatment parameters including KMnO4 concentration, treatment time, temperature and stirring rate on flotation recovery were investigated by single factor experiments. Surface treatment with KMnO4 changes selectively the flotation behavior of PC, PVC and PMMA, enabling separation of the plastics by froth flotation...
April 8, 2017: Waste Management
https://www.readbyqxmd.com/read/28399222/morphology-of-the-antenna-of-hermetia-illucens-diptera-stratiomyidae-an-ultrastructural-investigation
#15
M Pezzi, M Leis, M Chicca, P Falabella, R Salvia, A Scala, D Whitmore
The black soldier fly, Hermetia illucens (L.) (Diptera: Stratiomyidae), is a relevant species in waste and pest management, but is also of forensic and medical importance. A scanning electron microscopy (SEM) investigation of the antennae of both sexes of H. illucens is presented here for the first time. The antenna is composed of three regions: the scape, the pedicel, and the flagellum. The first two regions are single segments, whereas the third region, the longest one, is composed of eight flagellomeres...
March 13, 2017: Journal of Medical Entomology
https://www.readbyqxmd.com/read/28398221/amyloid-fibrils-from-hemoglobin
#16
Nadishka Jayawardena, Manmeet Kaur, Smitha Nair, Jenny Malmstrom, David Goldstone, Leonardo Negron, Juliet A Gerrard, Laura J Domigan
Amyloid fibrils are a class of insoluble protein nanofibers that are formed via the self-assembly of a wide range of peptides and proteins. They are increasingly exploited for a broad range of applications in bionanotechnology, such as biosensing and drug delivery, as nanowires, hydrogels, and thin films. Amyloid fibrils have been prepared from many proteins, but there has been no definitive characterization of amyloid fibrils from hemoglobin to date. Here, nanofiber formation was carried out under denaturing conditions using solutions of apo-hemoglobin extracted from bovine waste blood...
April 11, 2017: Biomolecules
https://www.readbyqxmd.com/read/28394413/fast-operando-electron-nanotomography
#17
L Roiban, S Li, M Aouine, A Tuel, D Farrusseng, T Epicier
Electron tomography in transmission electron microscopy provides valuable three-dimensional structural, morphological and chemical information of condensed matter at nanoscale. Current image acquisitions require at least tens of minutes, which prohibits the analysis of nano-objects evolving rapidly such as under dynamic environmental conditions. Reducing the acquisition duration to tens of seconds or less permits to follow in 3D the same object during its evolution under varying temperatures and pressures. We report Operando Electron nanotomography using image series acquired in less than 230 seconds instead of typically 15 min in the best cases so far...
April 10, 2017: Journal of Microscopy
https://www.readbyqxmd.com/read/28392121/development-of-new-materials-from-waste-electrical-and-electronic-equipment-characterization-and-catalytic-application
#18
J P Souza, P E Freitas, L D Almeida, M G Rosmaninho
Wastes of electrical and electronic equipment (WEEE) represent an important environmental problem, since its composition includes heavy metals and organic compounds used as flame-retardants. Thermal treatments have been considered efficient processes on removal of these compounds, producing carbonaceous structures, which, together with the ceramic components of the WEEE (i.e. silica and alumina), works as support material for the metals. This mixture, associated with the metals present in WEEE, represents promising systems with potential for catalytic application...
April 6, 2017: Waste Management
https://www.readbyqxmd.com/read/28390272/spectroscopic-thermogravimetric-and-structural-characterization-analyses-for-comparing-municipal-solid-waste-composts-and-vermicomposts-stability-and-maturity
#19
Nuhaa Soobhany, Sanjana Gunasee, Yogeshwari Pooja Rago, Hashita Joyram, Pravesh Raghoo, Romeela Mohee, Vinod Kumar Garg
This is the first-ever study of its kind for an extensive assessment and comparison of maturity indexes between compost and vermicompost that have been derived from Municipal Solid Waste (MSW). The spectroscopic (Fourier transform infrared spectroscopy: FT-IR), thermogravimetric analysis (TG), differential scanning calorimetry (DSC) and structural characterization (scanning electron microscope: SEM) were recorded. FT-IR spectra showed an increase in conversion of polysaccharides species and aliphatic methylene groups in vermicompost compared to compost as depicted from the variation of the intensity of the peaks...
March 29, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28390236/analysing-the-mechanisms-of-sludge-digestion-enhanced-by-iron
#20
Xiaodi Hao, Jing Wei, Mark C M van Loosdrecht, Daqi Cao
Carbon-neutral operation of wastewater treatment plants (WWTPs) requires enhancing anaerobic digestion (AD) of excess sludge for a higher energy conversion efficiency. Among others, iron has been identified to function on enhancing methane production in AD. As an industrial residual, waste iron scraps (WISs) have been reported as potentially enhancing CH4 production in AD. With this study, the mechanisms of AD enhanced by WISs are analysed in a two-phase process: acidogenic phase (AP) and methanogenic phase (MP)...
March 25, 2017: Water Research
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