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Anaerobic work capacity

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https://www.readbyqxmd.com/read/28903764/comparative-assessment-of-fermentative-capacity-of-different-xylose-consuming-yeasts
#1
Henrique César Teixeira Veras, Nádia Skorupa Parachin, João Ricardo Moreira Almeida
BACKGROUND: Understanding the effects of oxygen levels on yeast xylose metabolism would benefit ethanol production. In this work, xylose fermentative capacity of Scheffersomyces stipitis, Spathaspora passalidarum, Spathaspora arborariae and Candida tenuis was systematically compared under aerobic, oxygen-limited and anaerobic conditions. RESULTS: Fermentative performances of the four yeasts were greatly influenced by oxygen availability. S. stipitis and S. passalidarum showed the highest ethanol yields (above 0...
September 13, 2017: Microbial Cell Factories
https://www.readbyqxmd.com/read/28875251/the-effect-of-substrate-inoculum-ratio-on-the-kinetics-of-methane-production-in-swine-wastewater-anaerobic-digestion
#2
Verónica Córdoba, Mónica Fernández, Estela Santalla
Methane production from swine wastewater was evaluated by using sewage sludge as inoculum in three substrate to inoculum ratios (SIRs) named A (1:1), B (3:1) and C (6:1), with the objective to identify the proportion that optimizes the performance of the process. Duplicated batch bioreactors of 1 L capacity under mesophilic conditions were used to carry out the experiment. The highest biogas yield was observed in A treatment (554 ± 75 mL/g volatile solid (VS)). Cumulative methane production decreased from 382 ± 22 to 232 ± 5 mL/g VS when SIR increased from 1:1 to 6:1...
September 5, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28835177/organic-loading-rate-olr-effect-in-the-acidogenesis-of-cheese-whey-uasb-and-an-sbr-reactors-comparison
#3
R Calero, R Iglesias-Iglesias, M C Veiga, C Kennes
Volatile fatty acid (VFA) production and degree acidification (DA) were investigated in the anaerobic treatment of cheese whey (CW) by comparison of two processes, a continuous process using a laboratory Upflow Anaerobic Sludge Blanket (UASB) and discontinuous process using a Sequencing Batch Reactor (SBR). The main purpose of this work was the study of the organic loading rate (OLR) effect on the capacity to obtain the maximum yield of VFA in the two kinds of reactor. The predominant products in the acidogenic process in both reactors were: acetate, propionate, butyrate and valerate...
August 23, 2017: Environmental Technology
https://www.readbyqxmd.com/read/28832393/caffeine-increases-work-done-above-critical-power-but-not-anaerobic-work
#4
Rodrigo Silveira, Victor Amorim Andrade-Souza, Lucyana Arcoverde, Fabiano Tomazini, André Sansonio, David John Bishop, Romulo Bertuzzi, Adriano Eduardo Lima-Silva
PURPOSE: The assumption that the curvature constant (W´) of the power-duration relationship represents anaerobic work capacity is a controversial, unresolved question. We investigated if caffeine ingestion could increase total work done above critical power (CP), and if this would be accompanied by greater anaerobic energy expenditure and by an enhanced maintenance of maximal oxidative metabolic rate. METHODS: Nine men (26.6 ± 5.3 years, V˙O2max 40.6 ± 5.8 mL·kg·min) cycled until exhaustion at different exercise intensities on different days to determine the CP and W´...
August 21, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28804812/predominance-of-comorbidities-in-the-detriment-of-daily-activity-in-sarcoidosis-patients
#5
S Kostorz, D Jastrzębski, M Sikora, A Zebrowska, A Margas, D Stepanik, H Swinder, D Ziora
Sarcoidosis may affect lung function, working ability, overall mobility, and daily activity. In the present study we performed an analysis of clinical settings in patients with sarcoidosis to disentangle its influence on daily physical activity (PA). PA assessment (number of steps per day, daily energy expenditure) was performed by accelerometry during consecutive 7 days after discharge from hospital. Thirty patients with sarcoidosis, aged 46.4 ± 10.5, were enrolled in the study. Clinical data (age, gender, steroid consumption, weight, and comorbidities), lung function tests (forced expiratory volume in one second - FEV1, forced vital capacity - FVC, and lung diffusion for carbon monoxide - DLCO), mobility (6-minute walk test- 6MWT) and physical performance (oxygen consumption at anaerobic threshold - VO2/AT) were estimated...
August 15, 2017: Advances in Experimental Medicine and Biology
https://www.readbyqxmd.com/read/28724255/effects-of-organic-composition-on-the-anaerobic-biodegradability-of-food-waste
#6
Yangyang Li, Yiying Jin, Aiduan Borrion, Hailong Li, Jinhui Li
This work investigated the influence of carbohydrates, proteins and lipids on the anaerobic digestion of food waste (FW) and the relationship between the parameters characterising digestion. Increasing the concentrations of proteins and lipids, and decreasing carbohydrate content in FW, led to high buffering capacity, reduction of proteins (52.7-65.0%) and lipids (57.4-88.2%), and methane production (385-627 mLCH4/g volatile solid), while achieving a short retention time. There were no significant correlations between the reduction of organics, hydrolysis rate constant (0...
July 8, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28664497/bacterial-periphytic-communities-related-to-mercury-methylation-within-aquatic-plant-roots-from-a-temperate-freshwater-lake-south-western-france
#7
Sophie Gentès, Julie Taupiac, Yannick Colin, Jean-Marc André, Rémy Guyoneaud
Macrophyte floating roots are considered as hotspots for methylmercury (MeHg) production in aquatic ecosystems through microbial activity. Nevertheless, very little is known about periphyton bacterial communities and mercury (Hg) methylators in such ecological niches. The ability to methylate inorganic Hg is broadly distributed among prokaryotes; however, sulfate-reducers have been reported to be the most important MeHg producers in macrophyte floating roots. In the present work, the periphyton bacterial communities colonizing Ludwigia sp...
June 30, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28628978/a-high-throughput-dye-reducing-photometric-assay-for-evaluating-microbial-exoelectrogenic-ability
#8
Xiang Xiao, Qiu-Yue Liu, Ting-Ting Li, Feng Zhang, Wen-Wei Li, Xiang-Tong Zhou, Mei-Ying Xu, Qian Li, Han-Qing Yu
Exoelectrogenic bacteria (EEB) can transfer electrons to extracellular electron acceptors and have wide applications in environmental bioremediation and bioenergy generation. Thus, methods for effectively probing the exoelectrogenic ability of EEB are highly desirable. In this work, a simple but efficient photometric assay based on the extracellular reduction of high polar dyes was developed to evaluate the microbial exoelectrogenic ability. Methyl orange were proven to be used as a probe for evaluating the exoelectrogenic ability of EEB...
October 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28625987/metabolic-engineering-of-actinobacillus-succinogenes-provides-insights-into-succinic-acid-biosynthesis
#9
Michael T Guarnieri, Yat-Chen Chou, Davinia Salvachúa, Ali Mohagheghi, Peter C St John, Darren J Peterson, Yannick J Bomble, Gregg T Beckham
Actinobacillus succinogenes, a Gram-negative facultative anaerobe, exhibits the native capacity to convert pentose and hexose sugars to succinic acid (SA) with high yield as a tricarboxylic acid (TCA) cycle intermediate. In addition, A. succinogenes is capnophilic, incorporating CO2 into SA, making this organism an ideal candidate host for conversion of lignocellulosic sugars and CO2 to an emerging commodity bioproduct sourced from renewable feedstocks. In this work, we report the development of facile metabolic engineering capabilities in A...
September 1, 2017: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/28599009/anaerobic-metabolism-during-short-all-out-efforts-in-tethered-running-comparison-of-energy-expenditure-and-mechanical-parameters-between-different-sprint-durations-for-testing
#10
Filipe Antônio Barros Sousa, Rubens Eduardo Vasque, Claudio Alexandre Gobatto
This study's aims to verify the energy expenditure, metabolic distress and usefulness to evaluate the anaerobic constructs for different all-out durations in running efforts. Twelve active male underwent four testing sessions, one for familiarization and three performing one all-out (AO) tethered running sprint lasting 30s, 20s or 10s. Oxygen consumption, excess post exercise oxygen consumption, and lactate production were retained to analyse metabolic function, together with mechanical power and work as performance parameters...
2017: PloS One
https://www.readbyqxmd.com/read/28530517/contributions-of-body-composition-characteristics-to-critical-power-and-anaerobic-work-capacity
#11
M Travis Byrd, Jonathan Robert Switalla, Joel E Eastman, Brian J Wallace, Jody L Clasey, Haley C Bergstrom
Critical power (CP) and anaerobic work capacity (AWC) from the CP test represent distinct parameters related to metabolic characteristics of the whole body and active muscle tissue, respectively. PURPOSE: This study examined the contribution of whole body composition characteristics and local lean mass to further elucidate the differences in metabolic characteristics between CP and AWC as they relate to whole body and local factors. METHODS: Fifteen, anaerobically trained males were assessed for whole body (% body fat [%BF] and mineral-free, lean mass [LBM]) and local mineral-free thigh lean mass (TLM) composition characteristic...
May 22, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28522658/effect-of-fontan-geometry-on-exercise-haemodynamics-and-its-potential-implications
#12
Elaine Tang, Zhenglun Alan Wei, Kevin K Whitehead, Reza H Khiabani, Maria Restrepo, Lucia Mirabella, James Bethel, Stephen M Paridon, Bradley S Marino, Mark A Fogel, Ajit P Yoganathan
OBJECTIVE: Exercise intolerance afflicts Fontan patients with total cavopulmonary connections (TCPCs) causing a reduction in quality of life. Optimising TCPC design is hypothesised to have a beneficial effect on exercise capacity. This study investigates relationships between TCPC geometries and exercise haemodynamics and performance. METHODS: This study included 47 patients who completed metabolic exercise stress test with cardiac magnetic resonance (CMR). Phase-contrast CMR images were acquired immediately following supine lower limb exercise...
May 18, 2017: Heart: Official Journal of the British Cardiac Society
https://www.readbyqxmd.com/read/28512675/selection-and-characterization-of-an-anaerobic-microbial-consortium-with-high-adaptation-to-crude-glycerol-for-1-3-propanediol-production
#13
Jin-Jie Zhou, Jun-Tao Shen, Li-Li Jiang, Ya-Qin Sun, Ying Mu, Zhi-Long Xiu
Crude glycerol is an ideal feedstock for bioproduction of 1,3-propanediol (1,3-PDO) while pure culture always shows low substrate tolerance and limited productivity. In this study, an anaerobic microbial consortium for conversion of crude glycerol was selected and its 1,3-PDO production capacity was evaluated. The consortium was obtained from anaerobic activated sludge by 19 serial transfers and mainly consisted of 94.64% Clostridiaceae and 4.47% Peptostreptococcaceae. The consortium adapted well with high glycerol concentration of 120 g/L as well as wide substrate concentration fluctuation from 15 to 80 g/L, producing 60...
May 16, 2017: Applied Microbiology and Biotechnology
https://www.readbyqxmd.com/read/28474866/the-effects-of-gymnastics-training-on-selected-parameters-of-anaerobic-capacity-in-12-year-old-boys
#14
Piotr Sawicki, Marcin Dornowski, Tomasz Grzywacz, Jan J Kaczor
BACKGROUND: One of the aims of the study was to describe the physiological factors of young boys participating in artistic gymnastic training and evaluate differences between the levels of aerobic and anaerobic efficiency in this group as compared to the control group. METHODS: The young male gymnasts selected to participate in the present study have been (G) participating in the training process since they were six years old (n=12, age 11-12 y). In the control group (n=12, age 11-12 y), boys were participating in physical education classes (C)...
April 26, 2017: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/28452786/accelerated-anaerobic-hydrolysis-rates-under-a-combination-of-intermittent-aeration-and-anaerobic-conditions
#15
T R Jensen, T Lastra Milone, G Petersen, H R Andersen
Anaerobic hydrolysis in activated return sludge was investigated in laboratory scale experiments to find if intermittent aeration would accelerate anaerobic hydrolysis rates compared to anaerobic hydrolysis rates under strict anaerobic conditions. The intermittent reactors were set up in a 240 h experiment with intermittent aeration (3 h:3 h) in a period of 24 h followed by a subsequent anaerobic period of 24 h in a cycle of 48 h which was repeated five times during the experiment. The anaerobic reactors were kept under strict anaerobic conditions in the same period (240 h)...
April 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/28448788/production-of-biogas-from-co-digestion-of-livestock-and-agricultural-residues-a-case-study
#16
Brahim Arhoun, Cesar Gomez-Lahoz, Roberto Teofilo Abdala-Diaz, Jose Miguel Rodriguez-Maroto, Francisco Garcia-Herruzo, Carlos Vereda-Alonso
This study was undertaken to determine the possible changes in the digester yield and performance for the anaerobic co-digestion under mesophilic conditions of strawberry residues (SRs) together with pig manure (PM). The first part of this paper deals with the digestion of SR as a single substrate. For organic loading rates (OLRs) of 4.4 (g L(-1) d(-1)) or less, the experimental specific biogas and methane productions are 0.588 and 0.231 L g(-1), respectively. When higher OLRs (5.5 g L(-1) d(-1)) are used the digester fails due to acidification...
July 29, 2017: Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering
https://www.readbyqxmd.com/read/28445078/effects-of-high-intensity-interval-training-on-canoeing-performance
#17
Ming-Ta Yang, Mien-Mien Lee, Shu-Ching Hsu, Kuei-Hui Chan
The purpose of this study was to compare the effects of high-intensity interval training (HIIT) and moderate-intensity continuous training (MICT) utilizing a canoeing ergometer on endurance determinants, as well as aerobic and anaerobic performances among flat-water canoeists. Fourteen well-trained male flat-water canoeists were divided into an HIIT group or an MICT group. All subjects performed a continuous graded exercise test (GXT) and three fixed-distance (200, 500, and 1000 m) performance tests on a canoeing ergometer to determine canoeing economy, peak oxygen uptake (VO2peak), and power at VO2peak, and to calculate the critical velocity (CV) and anaerobic work capacity before and after the training programmes...
August 2017: European Journal of Sport Science
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
#18
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...
May 2, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28356624/relation-between-change-in-exercise-capacity-and-change-in-blood-amino-acids-in-patients-with-chronic-heart-failure
#19
Nobuo Morotomi, Masakazu Saitoh, Noriko Ishii, Kayoko Ohno, Masatoshi Nagayama, Nobuyuki Kawate, Masazumi Mizuma
[Purpose] Although cardiac rehabilitation (CR) is recommended for patients with chronic heart failure (CHF), adequate exercise effect cannot be obtained in elderly patients. Administration of amino acids (AA) to CHF patients has been reported to improve exercise capacity, but the changes in AA composition in plasma before and after CR had not been reported. This study aimed to measure plasma levels of AA in CHF patients and compare with values of normal range. In addition the relationship between the change of exercise capacity and AA were examined...
March 2017: Journal of Physical Therapy Science
https://www.readbyqxmd.com/read/28350415/anaerobic-exercise-testing-in-rehabilitation-a-systematic-review-of-available-tests-and-protocols
#20
REVIEW
Leonie A Krops, Trijntje Albada, Lucas H V van der Woude, Juha M Hijmans, Rienk Dekker
OBJECTIVE: Anaerobic capacity assessment in rehabilitation has received increasing scientific attention in recent years. However, anaerobic capacity is not tested consistently in clinical rehabilitation practice. This study reviews tests and protocols for anaerobic capacity in adults with various disabilities (spinal cord injury, cerebral palsy, cerebral vascular accident, lower-limb amputation(s)) and (able-bodied) wheelchair users. DATA SOURCES: PubMed, CINAHL and Web of Science...
April 6, 2017: Journal of Rehabilitation Medicine
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