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https://www.readbyqxmd.com/read/28342359/synergetic-effect-between-adsorption-and-photodegradation-on-nanostructured-tio2-activated-carbon-fiber-felt-porous-composites-for-toluene-removal
#1
Min Li, Bin Lu, Qin-Fei Ke, Ya-Jun Guo, Ya-Ping Guo
The low quantum efficiency and limited adsorption efficiency of TiO2 makes it only fit for the removal of VOCs with low concentrations. Herein, we for the first time fabricated nanostructured TiO2/activated carbon fiber felt (TiO2/ACFF) porous composites by the in situ deposition of TiO2 microspheres on the carbon fibers in ACFF. Interestingly, the TiO2 microspheres exhibit hierarchical nanostructures constructed by nanocrystals as building blocks. The TiO2/ACFF porous composites possess excellent adsorption and photodegradation properties for toluene because of the synergetic effects between the nanostructured TiO2 and ACFF...
March 15, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28340452/a-study-of-photosynthetic-biogas-upgrading-based-on-a-high-rate-algal-pond-under-alkaline-conditions-influence-of-the-illumination-regime
#2
Mariana Franco-Morgado, Cynthia Alcántara, Adalberto Noyola, Raúl Muñoz, Armando González-Sánchez
Microalgal-bacterial processes have emerged as environmental friendly systems for the cost-effective treatment of anaerobic effluents such as biogas and nutrients-laden digestates. Environmental parameters such as temperature, irradiation, nutrient concentration and pH effect the performance of the systems. In this paper, the potential of a microalgal-bacterial photobioreactor operated under high pH (≈9.5) and high alkalinity to convert biogas into biomethane was evaluated. The influence of the illumination regime (continuous light supply vs 12h/12h light/dark cycles) on the synthetic biogas upgrading efficiency, biomass productivity and nutrient removal efficiency was assessed in a High-Rate Algal Pond interconnected to a biogas absorption bubble column...
March 20, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28340433/feasibility-of-carbon-dioxide-sequestration-by-spongiochloris-sp-microalgae-during-petroleum-wastewater-treatment-in-airlift-bioreactor
#3
Abdeldjalil Abid, Faten Saidane, Moktar Hamdi
The aim of this work was to study the ability of using Hydrocabonoclastic native microbial and Spongiochloris sp microalgae in airlift bioreactors couples in order to restore hydrocarbons wastewater and develop the capacity of natural systems to reduce greenhouse effect through maximal control of CO2 gas emission in atmosphere. The kinetic parameters of CO2 gas fixation level and conversion it into biological material by microalgae as the biodegradation process effect in hydrocarbon have been evaluated. The result present that maximum specific growth rate μmax of Spongiochloris sp was (0...
March 10, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28334620/supercritical-water-oxidation-of-oil-based-drill-cuttings
#4
Zhong Chen, Zeliang Chen, Fengjun Yin, Guangwei Wang, Hongzhen Chen, Chunlan He, Yuanjian Xu
Oil-based drill cuttings (OBDC) are a typical hazardous solid waste that arises from drilling operations in oil and gas fields. The supercritical water oxidation (SCWO) of OBDC was comprehensively investigated in a batch reactor under the conditions of various oxygen coefficients (OC, 1.5-3.5), temperatures (T, 400-500°C) and reaction times (t, 0.5-10min). Preheating experiments indicated that most of the organic compounds in the initial OBDC sample were distributed within gaseous, oil, aqueous and solid phases, with no more than 9...
March 9, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28333037/cerebral-hemodynamic-with-intra-aortic-balloon-pump-business-as-usual
#5
Juliana Caldas, Ronney B Panerai, Edson Bor-Seng-Shu, Juliano Almeida, Graziela Ferreira, Ligia Cunha, Ricardo Nogueira, Marcelo Oliveira, Fabio Jatene, Thompson Robinson, Ludhmila Hajjar
Intra-aortic balloon pump (IABP) is commonly used as mechanical support after cardiac surgery or cardiac shock. Although its benefits for cardiac function have been well documented, its effects on cerebral circulation are still controversial. We hypothesized that transfer function analysis (TFA) and continuous estimates of dynamic cerebral autoregulation (CA) provide consistent results in the assessment of cerebral autoregulation in patients with IABP. Continuous recordings of blood pressure (BP, intra-arterial line), end-tidal CO2, heart rate and cerebral blood flow velocity (CBFV, transcranial Doppler) were obtained i) 5 minutes with IABP ratio 1:3, ii) 5 minutes, starting 1 minute with the IABP-ON, and continuing for another 4 minutes without pump assistance (IABP-OFF)...
March 23, 2017: Physiological Measurement
https://www.readbyqxmd.com/read/28332748/guest-induced-assembly-of-bis-thiosemicarbazonato-zinc-ii-coordination-nanotubes
#6
Brett M Paterson, Keith F White, Jonathan M White, Brendan F Abrahams, Paul S Donnelly
A Zn(II) complex of the dianionic tetradentate ligand formed by deprotonation of glyoxal-bis(4-phenyl-3-thiosemicarbazone) (H2 gtsp) is a [3+3] trinuclear triangular prism. Recrystallization of this complex in the presence of either CO2 , CS2 , or CH3 CN leads to the formation of [4+4] open-ended charge-neutral tetranuclear coordination nanotubes, approximately 2 nm in length and with internal dimensions large enough to accommodate linear guest molecules, which serve to template their formation. Upon removal of the templating molecules the nanotubes demonstrated reversible sorption of CO2 with an isosteric enthalpy of sorption of 28 kJ mol(-1) at low loading...
March 23, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28330147/erratum-to-evaluation-of-photosynthetic-efficacy-and-co2-removal-of-microalgae-grown-in-an-enriched-bicarbonate-medium
#7
S Abinandan, S Shanthakumar
No abstract text is available yet for this article.
June 2016: 3 Biotech
https://www.readbyqxmd.com/read/28330079/evaluation-of-photosynthetic-efficacy-and-co2-removal-of-microalgae-grown-in-an-enriched-bicarbonate-medium
#8
S Abinandan, S Shanthakumar
Bicarbonate species in the aqueous phase is the primary source for CO2 for the growth of microalgae. The potential of carbon dioxide (CO2) fixation by Chlorella pyrenoidosa in enriched bicarbonate medium was evaluated. In the present study, effects of parameters such as pH, sodium bicarbonate concentration and inoculum size were assessed for the removal of CO2 by C. pyrenoidosa under mixotrophic condition. Central composite design tool from response surface methodology was used to validate statistical methods in order to study the influence of these parameters...
June 2016: 3 Biotech
https://www.readbyqxmd.com/read/28328040/purification-of-baso4-precipitate-contaminated-with-organic-matter-for-oxygen-isotope-measurements-%C3%AE-18-o-and-%C3%AE-17-o
#9
Luhua Xie, Baruch Spiro, Gangjian Wei
RATIONALE: Sulfate precipitates are often contaminated with nitrates and organic materials (OM), which reduce the precision and accuracy of measurements of δ(18) O and Δ(17) O values in the sulfate. Although nitrates can be effectively removed using diethylenetriaminepentaacetic acid solution, removing OM from the precipitates is often difficult. One effective approach is to heat powdered precipitates to high temperatures. In this study, the effect of this procedure on the δ(18) O and Δ(17) O values of BaSO4 precipitate was fully examined...
July 30, 2016: Rapid Communications in Mass Spectrometry: RCM
https://www.readbyqxmd.com/read/28326127/detecting-peatland-drains-with-object-based-image-analysis-and-geoeye-1-imagery
#10
J Connolly, N M Holden
BACKGROUND: Peatlands play an important role in the global carbon cycle. They provide important ecosystem services including carbon sequestration and storage. Drainage disturbs peatland ecosystem services. Mapping drains is difficult and expensive and their spatial extent is, in many cases, unknown. An object based image analysis (OBIA) was performed on a very high resolution satellite image (Geoeye-1) to extract information about drain location and extent on a blanket peatland in Ireland...
December 2017: Carbon Balance and Management
https://www.readbyqxmd.com/read/28318265/cytoskeletal-like-filaments-of-ca-2-calmodulin-dependent-protein-kinase-ii-are-formed-in-a-regulated-and-zn-2-dependent-manner
#11
Laurel Hoffman, Lin Li, Emil Alexov, Hugo Sanabria, M Neal Waxham
Ca(2+)-calmodulin-dependent protein kinase II (CaMKII) is highly abundant in neurons, where its concentration reaches that typically found for cytoskeletal proteins. Functional reasons for such a high concentration are not known, but given the multitude of known binding partners for CaMKII, a role as a scaffolding molecule has been proposed. In this report, we provide experimental evidence that demonstrates a novel structural role for CaMKII. We discovered that CaMKII forms filaments that can extend for several micrometers in the presence of certain divalent cations (Zn(2+), Cd(2+), and Cu(2+)) but not with others (Ca(2+), Mg(2+), Co(2+), and Ni(2+))...
March 24, 2017: Biochemistry
https://www.readbyqxmd.com/read/28318245/dinuclear-rhenium-complex-with-a-proton-responsive-ligand-as-a-redox-catalyst-for-the-electrochemical-co2-reduction
#12
Alexander Wilting, Thorsten Stolper, Ricardo A Mata, Inke Siewert
Herein, we present the reduction chemistry of a dinuclear α-diimine rhenium complex, 1, [Re2(L)(CO)6Cl2], with a proton responsive ligand and its application as a catalyst in the electrochemical CO2 reduction reaction (L = 4-tert-butyl-2,6-bis(6-(1H-imidazol-2-yl)-pyridin-2-yl)phenol). The complex has a phenol group in close proximity to the active center, which may act as a proton relay during catalysis, and pyridine-NH-imidazole units as α-diimine donors. The complex is an active catalyst for the electrochemical CO2 reduction reaction...
March 20, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28316468/nutritional-quality-and-physicochemical-characteristics-of-defatted-bovine-liver-treated-by-supercritical-carbon-dioxide-and-organic-solvent
#13
Sung-Won Kang, Hye-Min Kim, M Shafiur Rahman, Ah-Na Kim, Han-Sul Yang, Sung-Gil Choi
Defatted bovine liver (DBL) is a potential source of protein and minerals. Supercritical carbon dioxide (SC-CO2) and a traditional organic solvent method were used to remove lipid from bovine liver, and the quality characteristics of a control bovine liver (CBL), bovine liver defatted by SC-CO2 (DBLSC-CO2) at different pressures, and bovine liver defatted by organic solvent (DBL-OS) were compared. The DBLSC-CO2 samples had significantly higher (p<0.05) protein, amino acid, carbohydrate, and fiber contents than CBL and DBL-OS...
2017: Korean Journal for Food Science of Animal Resources
https://www.readbyqxmd.com/read/28301712/hypoxia-responsive-erfs-involved-in-post-deastringency-softening-of-persimmon-fruit
#14
Miao-Miao Wang, Qing-Gang Zhu, Chu-Li Deng, Zheng-Rong Luo, Ning-Jing Sun, Donald Grierson, Xue-Ren Yin, Kun-Song Chen
Removal of astringency by endogenously formed acetaldehyde, achieved by postharvest anaerobic treatment, is of critical importance for many types of persimmon fruit. Although an anaerobic environment accelerates de-astringency it also has the deleterious effect of promoting excessive softening, reducing shelf-life and marketability. Some hypoxia-responsive ethylene response factor (ERFs) participate in anaerobic de-astringency, but their role in accelerated softening was unclear. Undesirable rapid softening induced by high CO2 (95%) was ameliorated by adding the ethylene inhibitor 1-MCP (1 μl L(-1) ), resulting in reduced astringency while maintaining firmness, suggesting that CO2 -induced softening involves ethylene signalling...
March 16, 2017: Plant Biotechnology Journal
https://www.readbyqxmd.com/read/28287087/global-metabolic-rewiring-for-improved-co2-fixation-and-chemical-production-in-cyanobacteria
#15
Masahiro Kanno, Austin L Carroll, Shota Atsumi
Cyanobacteria have attracted much attention as hosts to recycle CO2 into valuable chemicals. Although cyanobacteria have been engineered to produce various compounds, production efficiencies are too low for commercialization. Here we engineer the carbon metabolism of Synechococcus elongatus PCC 7942 to improve glucose utilization, enhance CO2 fixation and increase chemical production. We introduce modifications in glycolytic pathways and the Calvin Benson cycle to increase carbon flux and redirect it towards carbon fixation...
March 13, 2017: Nature Communications
https://www.readbyqxmd.com/read/28284732/reduction-in-surgical-fog-with-a-warm-humidified-gas-management-protocol-significantly-shortens-procedure-time-in-pediatric-robot-assisted-laparoscopic-procedures
#16
B Meenakshi-Sundaram, J R Furr, E Malm-Buatsi, B Boklage, E Nguyen, D Frimberger, B W Palmer
INTRODUCTION: The adoption of robot-assisted laparoscopic (RAL) procedures in the field of urology has occurred rapidly, but is, to date, without pediatric-specific instrumentation. Surgical fog is a significant barrier to safe and efficient laparoscopy. This appears to be a significant challenge when adapting three-dimensional 8.5-mm scopes to use in pediatric RAL surgery. The objective of the present study was to compare matched controls from a prospectively collected database to procedures that were performed utilizing special equipment and a protocol to minimize surgical fog in pediatric RAL procedures...
February 24, 2017: Journal of Pediatric Urology
https://www.readbyqxmd.com/read/28284446/biofiltration-of-xylene-using-wood-charcoal-as-the-biofilter-media-under-transient-and-high-loading-conditions
#17
Kiran Singh, B S Giri, Amrita Sahi, S R Geed, M K Kureel, Sanjay Singh, S K Dubey, B N Rai, Surendra Kumar, S N Upadhyay, R S Singh
The main objective of this study was to evaluate the performance of wood charcoal as biofilter media under transient and high loading condition. Biofiltration of xylene was investigated for 150days in a laboratory scale unit packed with wood charcoal and inoculated with mixed microbial culture at the xylene loading rates ranged from 12 to 553gm(-3)h(-1). The kinetic analysis of the xylene revealed absence of substrate inhibition and possibility of achieving higher elimination under optimum condition. The pH, temperature, pressure drop and CO2 production rate were regularly monitored during the experiments...
February 21, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28284115/bioelectrochemical-systems-using-microalgae-a-concise-research-update
#18
Rijuta Ganesh Saratale, Chandrasekar Kuppam, Ackmez Mudhoo, Ganesh Dattatraya Saratale, Sivagurunathan Periyasamy, Guangyin Zhen, László Koók, Péter Bakonyi, Nándor Nemestóthy, Gopalakrishnan Kumar
Excess consumption of energy by humans is compounded by environmental pollution, the greenhouse effect and climate change impacts. Current developments in the use of algae for bioenergy production offer several advantages. Algal biomass is hence considered a new bio-material which holds the promise to fulfil the rising demand for energy. Microalgae are used in effluents treatment, bioenergy production, high value added products synthesis and CO2 capture. This review summarizes the potential applications of algae in bioelectrochemically mediated oxidation reactions in fully biotic microbial fuel cells for power generation and removal of unwanted nutrients...
February 27, 2017: Chemosphere
https://www.readbyqxmd.com/read/28282572/performance-of-nitrogen-doped-graphene-aerogel-particle-electrodes-for-electro-catalytic-oxidation-of-simulated-bisphenol-a-wastewaters
#19
Zhuang Chen, Yimei Zhang, Lincheng Zhou, Hao Zhu, Fei Wan, Yue Wang, Dandan Zhang
The treatment of effluent containing Bisphenol A (BPA) was investigated experimentally using nitrogen-doped graphene aerogel (NGAs) as particle electrodes in a three-dimensional electrode reactor for the electrochemical treatment was studied. The effects of the cell voltage, pH, the ratio of NGAs mass to solution volume and repeated times on the removal efficiency were investigated. Compared with commercial carbon particle electrodes, the NGAs exhibited stronger activity to remove BPA simulated wastewater. For 15mgL(-1) of BPA solution, the degradation rate of BPA exceeded 90% after treatment for only 30min under the optimum conditions...
February 27, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28279534/winter-ecology-of-a-subalpine-grassland-effects-of-snow-removal-on-soil-respiration-microbial-structure-and-function
#20
Konstantin Gavazov, Johannes Ingrisch, Roland Hasibeder, Robert T E Mills, Alexandre Buttler, Gerd Gleixner, Jukka Pumpanen, Michael Bahn
Seasonal snow cover provides essential insulation for mountain ecosystems, but expected changes in precipitation patterns and snow cover duration due to global warming can influence the activity of soil microbial communities. In turn, these changes have the potential to create new dynamics of soil organic matter cycling. To assess the effects of experimental snow removal and advanced spring conditions on soil carbon (C) and nitrogen (N) dynamics, and on the biomass and structure of soil microbial communities, we performed an in situ study in a subalpine grassland in the Austrian Alps, in conjunction with soil incubations under controlled conditions...
March 6, 2017: Science of the Total Environment
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