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https://www.readbyqxmd.com/read/28340438/long-term-stability-and-nutrient-removal-efficiency-of-aerobic-granules-at-low-organic-loads
#1
Abbass Jafari Kang, Qiuyan Yuan
The feasibility of application of aerobic granular sludge cultivated with high organic loads for biological nutrient removal (BNR) from low-strength wastewater was studied. Granules obtained with high-strength (COD=1400mg/L) wastewater were fed with medium (COD=700mg/L) and then low-strength (COD=400mg/L) wastewater. The granules rapidly acclimated to the medium-strength wastewater. However, feeding with low-strength wastewater reduced the F/M ratio from 0.4 to 0.2gCOD/gVSSd and granules disintegration occurred...
March 11, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28340420/extended-anaerobic-conditions-in-the-biological-wastewater-treatment-higher-reduction-of-toxicity-compared-to-target-organic-micropollutants
#2
Johannes Völker, Tobias Vogt, Sandro Castronovo, Arne Wick, Thomas A Ternes, Adriano Joss, Jörg Oehlmann, Martin Wagner
Extended anaerobic conditions during biological wastewater treatment may enhance the biodegradation of micropollutants. To explore this, we combined iron-reducing or substrate-limited anaerobic conditions and aerobic pilot-scale reactors directly at a wastewater treatment plant. To investigate the detoxification by these processes, we applied two in vitro bioassays for baseline toxicity (Microtox) and reactive toxicity (AREc32) as well as in vivo bioassays with aquatic model species in two laboratory experiments (Desmodesmus subspicatus, Daphnia magna) and two on-site, flow-through experiments (Potamopyrgus antipodarum, Lumbriculus variegatus)...
March 14, 2017: Water Research
https://www.readbyqxmd.com/read/28340292/combined-spiroergometry-and-31-p-mrs-of-human-calf-muscle-during-high-intensity-exercise
#3
K Moll, A Gussew, C Hein, N Stutzig, J R Reichenbach
Simultaneous measurements of pulmonary oxygen consumption (VO2 ), carbon dioxide exhalation (VCO2 ) and phosphorus magnetic resonance spectroscopy ((31) P-MRS) are valuable in physiological studies to evaluate muscle metabolism during specific loads. Therefore, the aim of this study was to adapt a commercially available spirometric device to enable measurements of VO2 and VCO2 whilst simultaneously performing (31) P-MRS at 3 T. Volunteers performed intense plantar flexion of their right calf muscle inside the MR scanner against a pneumatic MR-compatible pedal ergometer...
March 24, 2017: NMR in Biomedicine
https://www.readbyqxmd.com/read/28340243/finite-time-parametric-identification-for-the-model-representing-the-metabolic-and-genetic-regulatory-effects-of-sequential-aerobic-respiration-and-anaerobic-fermentation-processes-in-escherichia-coli
#4
Alfonso Sepúlveda-Gálvez, Jesús Agustín Badillo-Corona, Isaac Chairez
Mathematical modelling applied to biological systems allows for the inferring of changes in the dynamic behaviour of organisms associated with variations in the environment. Models based on ordinary differential equations are most commonly used because of their ability to describe the mechanisms of biological systems such as transcription. The disadvantage of using this approach is that there is a large number of parameters involved and that it is difficult to obtain them experimentally. This study presents an algorithm to obtain a finite-time parameter characterization of the model used to describe changes in the metabolic behaviour of Escherichia coli associated with environmental changes...
March 17, 2017: Mathematical Medicine and Biology: a Journal of the IMA
https://www.readbyqxmd.com/read/28339706/differential-proliferation-and-metabolic-activity-of-sertoli-cells-in-the-testes-of-broiler-and-layer-breeder-chickens
#5
Mélanie Faure, Edith Guibert, Sabine Crochet, Pascal Chartrin, Jean-Pierre Brillard, Anne Collin, Pascal Froment
Decades of genetic selection have generated 2 different, highly specialized types of chickens in which 1 type, known as the layer-type chicken, expresses high laying performance while the other type, known as the broiler-type chicken, is dedicated to the production of fast-growing birds. Selected lines for the latter type often express disorders in their reproductive performance including early sexual maturation and accelerated, non-reversible seasonal decline of their semen production and mating behavior. The aim of the present study was to characterize some metabolic markers of the Sertoli cell populations...
February 21, 2017: Poultry Science
https://www.readbyqxmd.com/read/28339699/effects-of-chlorine-and-hydrogen-peroxide-sanitation-in-low-bacterial-content-water-on-biofilm-formation-model-of-poultry-brooding-house-waterlines
#6
P Maharjan, G Huff, W Zhang, S Watkins
An in vitro experiment was performed to determine if biofilm would develop when polyvinylchloride (PVC) test coupons (material used for poultry waterlines) were exposed to low bacterial content warm water (≤1000 cfu/mL, test water) and also to determine if biofilm development would be influenced by adding a sanitizer. PVC sections 2.54 cm long and internal diameter of 1. 90 cm were used as test coupons to grow biofilm. Two coupons were immersed in 600 mL test water in a beaker. Nine beakers were utilized similarly with a total of 18 coupons...
February 22, 2017: Poultry Science
https://www.readbyqxmd.com/read/28339438/the-role-of-autonomic-function-in-exercise-induced-endogenous-analgesia-a-case-control-study-in-myalgic-encephalomyelitis-chronic-fatigue-syndrome-and-healthy-people
#7
Jessica Van Oosterwijck, Uros Marusic, Inge De Wandele, Lorna Paul, Mira Meeus, Greta Moorkens, Luc Lambrecht, Lieven Danneels, Jo Nijs
BACKGROUND: Patients with myalgic encephalomyelitis / chronic fatigue syndrome (ME/CFS) are unable to activate brain-orchestrated endogenous analgesia (or descending inhibition) in response to exercise. This physiological impairment is currently regarded as one factor explaining post-exertional malaise in these patients. Autonomic dysfunction is also a feature of ME/CFS. OBJECTIVES: This study aims to examine the role of the autonomic nervous system in exercise-induced analgesia in healthy people and those with ME/CFS, by studying the recovery of autonomic parameters following aerobic exercise and the relation to changes in self-reported pain intensity...
March 2017: Pain Physician
https://www.readbyqxmd.com/read/28339183/tunable-porosity-of-crosslinked-polyhedral-oligomeric-silsesquioxane-poss-supports-for-palladium-catalyzed-aerobic-alcohol-oxidation-in-water
#8
Preeyanuch Sangtrirutnugul, Thanawat Chaiprasert, Warodom Hunsiri, Thanudkit Jitjaroendee, Patsaya Songkhum, Kritapas Laohhasurayotin, Tanakorn Osotchan, Vuthichai Ervithayasuporn
Polyhedral oligomeric silsesquioxane (POSS)-based materials, poly-POSS-Tn [n = 8 (1), 10 (2), 12 (3), and mix (4)], were prepared in high yields via free radical polymerization of corresponding pure forms of methacrylate-functionalized POSS monomers, MMA-POSS-Tn (n = 8, 10, 12), and the mixture form, MMA-POSS-Tmix. Powder X-ray diffraction (XRD) spectra and BET analysis indicate that 1-4 are amorphous materials with high surface areas (683-839 m2•g-1). The surface areas and total pore volumes follow the trend: poly-POSS-T12 > poly-POSS-T10 > poly-POSS-Tmix > poly-POSS-T8...
March 24, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28334677/centralized-management-of-sewage-sludge-and-agro-industrial-waste-through-co-composting
#9
M C Gutiérrez, A Serrano, J A Siles, A F Chica, M A Martín
In this research study, the co-composting process of a waste mixture containing strawberry extrudate, fish waste, sewage sludge and bulking agent (SEFW, 190:1:22:90 ratio) was carried out in a dynamic-solid respirometer at pilot scale. The aerobic biodegradability of the mixture was previously ensured in a static-liquid respirometer. The advantages and drawbacks of the SEFW co-composting process were subsequently identified through the determination of respirometric activity and the physical-chemical characterization of the waste, as well as the monitoring of odor emissions...
March 20, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28334675/exercise-increases-serum-brain-derived-neurotrophic-factor-in-patients-with-major-depressive-disorder
#10
A Kerling, M Kück, U Tegtbur, L Grams, S Weber-Spickschen, A Hanke, B Stubbs, K G Kahl
BACKGROUND: Brain derived neurotrophic factor (BDNF) has been implicated in the pathogenesis of major depressive disorder (MDD). Existing data on exercise treatment in people with MDD are inconsistent concerning the effect of exercise on BDNF pointing either to increased or unaltered BDNF concentrations. However, studies in non-depressed persons demonstrated a significant effect on resting peripheral BDNF concentrations in aerobic training interventions. Given the lack of clarity mentioned above, the current study aimed at examining the effect of adjunctive exercise on serum BDNF levels in guideline based treated patients with MDD...
March 18, 2017: Journal of Affective Disorders
https://www.readbyqxmd.com/read/28334666/bio-refractory-dissolved-organic-matter-and-colorants-in-cassava-distillery-wastewater-characterization-coagulation-treatment-and-mechanisms
#11
Ming Zhang, Zhou Wang, Penghui Li, Hua Zhang, Li Xie
An important portion of organic matter and colorants still remain in the biologically treated distillery wastewater, leaving the dark brown and odorous downstream with the heavy loading of chemical oxygen demand and the potential of forming disinfection byproducts. However, those bio-recalcitrant colorants have not been clearly recognized. The current study investigated the features of the bio-refractory organic matter and colorants in a typical distillery effluent, cassava distillery wastewater; special attention was paid to their change and behaviors in the coagulation treatment following the bio-processes...
March 20, 2017: Chemosphere
https://www.readbyqxmd.com/read/28334647/arsenic-load-in-rice-ecosystem-and-its-mitigation-through-deficit-irrigation
#12
Arkabanee Mukherjee, M Kundu, B Basu, B Sinha, M Chatterjee, M Das Bairagya, U K Singh, S Sarkar
Rice the staple food is a notable intake source of arsenic to the rural population of eastern India through food-chain. A field survey was carried out to study the variation of arsenic load in different parts of rice genotype Shatabdi (most popular genotype of the region) exposed to varying level of arsenic present in the irrigation water and soil. As irrigation is the primary source of arsenic contamination, a study was conducted to assess arsenic load in rice ecosystem under deficit irrigation practices like intermittent ponding (IP), saturation (SAT) and aerobic (AER) imposed during stress allowable stage (16-40 days after transplanting) of the crop (genotype Shatabdi)...
March 20, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28334391/sediment-anoxia-limits-microbial-driven-seagrass-carbon-remineralization-under-warming-conditions
#13
Stacey M Trevathan-Tackett, Justin R Seymour, Daniel A Nielsen, Peter I Macreadie, Thomas C Jeffries, Jonathan Sanderman, Jeff Baldock, Johanna M Howes, Andrew D L Steven, Peter Ralph
Seagrass ecosystems are significant carbon sinks, and their resident microbial communities ultimately determine the quantity and quality of carbon sequestered. However, environmental perturbations have been predicted to affect microbial-driven seagrass decomposition and subsequent carbon sequestration. Utilizing techniques including 16S-rDNA sequencing, solid-state NMR and microsensor profiling, we tested the hypothesis that elevated seawater temperatures and eutrophication enhance the microbial decomposition of seagrass leaf detritus and rhizome/root tissues...
March 15, 2017: FEMS Microbiology Ecology
https://www.readbyqxmd.com/read/28333392/the-biosynthesis-of-nitrous-oxide-in-the-green-alga-chlamydomonas-reinhardtii
#14
Maxence Plouviez, David Wheeler, Andy Shilton, Michael A Packer, Patricia A McLenachan, Emanuel Sanz-Luque, Francisco Ocaña-Calahorro, Emilio Fernández, Benoit Guieysse
Over the last decades, several studies have reported emissions of nitrous oxide (N2 O) from microalgae cultures and aquatic ecosystems characterized by a high level of algal activity (e.g. eutrophic lakes). As N2 O is a potent greenhouse gas (GHG) and an ozone depleting pollutant, these findings suggest that large scale microalgae cultivation (and possibly, natural eutrophic ecosystems) could have significant environmental impacts. Using the model unicellular microalga Chlamydomonas reinhardtii, this study was conducted to investigate the molecular basis of microalgal N2 O synthesis...
March 23, 2017: Plant Journal: for Cell and Molecular Biology
https://www.readbyqxmd.com/read/28333063/occurrence-and-elimination-of-antibiotics-in-three-sewage-treatment-plants-with-different-treatment-technologies-in-urumqi-and-shihezi-xinjiang
#15
Jiang Liu, Jianjiang Lu, Yanbin Tong, Chao Li
Fourteen antibiotics, including five quinolones (QNs), five sulfonamides (SAs), and four tetracyclines (TCs), were selected to investigate their occurrence and elimination in three sewage treatment plants (STPs) by employing different treatment technologies in Urumqi (two STPs) and Shihezi (one STP), China. The STP in Shihezi was chosen as representative to investigate the distribution of antibiotics in a sludge-sewage system. Results showed that the concentrations of most detected antibiotics ranged from tens to hundreds of nanograms per liter in influent samples and under 100 ng L(-1) in effluent samples...
March 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/28333043/sequential-anaerobic-aerobic-biological-treatment-of-colored-wastewaters-case-study-of-a-textile-dyeing-factory-wastewater
#16
Fardin Abiri, Narges Fallah, Babak Bonakdarpour
In the present study the feasibility of the use of a bacterial batch sequential anaerobic-aerobic process, in which activated sludge was used in both parts of the process, for pretreatment of wastewater generated by a textile dyeing factory has been considered. Activated sludge used in the process was obtained from a municipal wastewater treatment plant and adapted to real dyeing wastewater using either an anaerobic-only or an anaerobic-aerobic process over a period of 90 days. The use of activated sludge adapted using the anaerobic-aerobic process resulted in a higher overall decolorization efficiency compared to that achieved with activated sludge adapted using the anaerobic-only cycles...
March 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/28332263/synthesis-of-ortho-azophenols-by-formal-dehydrogenative-coupling-of-phenols-and-hydrazines-or-hydrazides
#17
Jean-Philip George Lumb, Kenneth Virgel N Esguerra
Azophenols are important chromophores and reagents in organic synthesis, with applications as pigments and molecular switches. Herein, we describe a catalytic aerobic process that couples phenols and hydrazines or hydrazides for their synthesis. The key aromatic C-N bond is formed via condensation between the hydrazine or hydrazide and an ortho-quinone, which triggers a redox-isomerization to install the azo functionality. Notable features include rapid access to highly functionalized azophenols with a range of electronic configurations, including "push-pull" systems, under conditions that employ simple, un-activated substrates, occur at room temperature using an earth-abundant and commercially available copper-catalyst, and produce water as the only stoichiometric byproduct...
March 22, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28332116/sweating-rate-and-sweat-sodium-concentration-in-athletes-a-review-of-methodology-and-intra-interindividual-variability
#18
REVIEW
Lindsay B Baker
Athletes lose water and electrolytes as a consequence of thermoregulatory sweating during exercise and it is well known that the rate and composition of sweat loss can vary considerably within and among individuals. Many scientists and practitioners conduct sweat tests to determine sweat water and electrolyte losses of athletes during practice and competition. The information gleaned from sweat testing is often used to guide personalized fluid and electrolyte replacement recommendations for athletes; however, unstandardized methodological practices and challenging field conditions can produce inconsistent/inaccurate results...
March 22, 2017: Sports Medicine
https://www.readbyqxmd.com/read/28332025/endurance-aerobic-high-intensity-and-repeated-sprint-cycling-performance-is-unaffected-by-normobaric-live-high-train-low-a-double-blind-placebo-controlled-cross-over-study
#19
Jacob Bejder, Andreas Breenfeldt Andersen, Rie Buchardt, Tanja Hultengren Larsson, Niels Vidiendal Olsen, Nikolai Baastrup Nordsborg
The aim was to investigate whether 6 weeks of normobaric "Live High-Train Low" (LHTL) using altitude tents affect highly trained athletes incremental peak power, 26-km time-trial cycling performance, 3-min all-out performance, and 30-s repeated sprint ability. In a double-blinded, placebo-controlled cross-over design, seven highly trained triathletes were exposed to 6 weeks of normobaric hypoxia (LHTL) and normoxia (placebo) for 8 h/day. LHTL exposure consisted of 2 weeks at 2500 m, 2 weeks at 3000 m, and 2 weeks at 3500 m...
March 22, 2017: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/28331163/in-vitro-evaluation-of-candidate-bacillus-spp-for-animal-feed
#20
Sirima Mingmongkolchai, Watanalai Panbangred
The aim of this study was to select aerobic spore-formers for animal feed based on their in vitro probiotic potential, including their enzyme-producing ability and safety assessment. Seven isolates out of 187 spore-forming bacteria were selected for their ability to produce cellulase (89.21-1668.32 U/ml), xylanase (1399.68-4351.10 U/ml), and phytase (2.72-28.70 U/ml). Among seven isolates, five had activities towards a broad range of p-nitrophenyl esters with acyl chain lengths from C2 to C12. The probiotic properties of all selected isolates varied with respect to their acid and bile salt tolerance under simulated gastrointestinal tract (GIT) conditions, and their adherence ability to human intestinal cell lines (Caco-2 and HT-29)...
March 22, 2017: Journal of General and Applied Microbiology
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