Search results for "Aerobic"

2020

Here, we present the genome sequence and annotation of the bacterial strain HV4-5-A1G, a potentially new Clostridium species. Based on its genomic data, this strain may act as a keystone microorganism in the hydrolysis of complex polymers, as well as in the different acidogenesis and acetogenesis steps during anaerobic digestion.

2020

Here, we present the genome sequence and annotation of the novel bacterial strain HV4-5-C5C, which may represent a new genus within the family Oscillospiraceae (order Eubacteriales ). This strain is a potential keystone species in the hydrolysis of complex polymers during anaerobic digestion of biomass.

NAD(P)H regeneration is the key for heterolactic fermentation of hexoses in Oenococcus oeni

2002

Oenococcus oeni (formerly Leuconostoc oenos) can perform malolactic fermentation, converting L-malate to L-lactate and carbon dioxide, in wines. The energy and redox potential required to support the growth of the micro-organism are supplied mainly by the consumption of carbohydrates via the heterolactic pathway. In the first steps of hexose metabolism two molecules of NAD(P)(+) are consumed, which must be regenerated in later reactions. The aim of this work was to test if aerobic growth of O. oeni promotes higher cell yields than anaerobic conditions, as has been shown for other lactic acid bacteria. O. oeni M42 was found to grow poorly under aerobic conditions with glucose as the only car…

Electrical conductivity as a state indicator for the start-up period of anaerobic fixed-bed reactors.

2016

The aim of this work was to analyse the applicability of electrical conductivity sensors for on-line monitoring the start-up period of an anaerobic fixed-bed reactor. The evolution of bicarbonate concentration and methane production rate was analysed. Strong linear relationships between electrical conductivity and both bicarbonate concentration and methane production rate were observed. On-line estimations of the studied parameters were carried out in a new start-up period by applying simple linear regression models, which resulted in a good concordance between both observed and predicted values. Electrical conductivity sensors were therefore identified as an interesting method for monitori…

2020

Physical activity and exercise beneficially link to brain properties and cognitive functions in older adults, but the findings concerning adolescents remain tentative. During adolescence, the brain ...

Seasonal Changes in physiological parameters in young club level rowers

2013

Aims: To evaluate variations in biometrics, physiological and performance parameters over a seasonal training – from September to March - in club level young rowers. Methods: Six young rowers, age 13-15, affiliated with a rowing club member of the Italian Rowing Federation, were assessed three times at regular three-months intervals (September, December, and March) during the 2011 season. Biometrics evaluations included stature, body mass and body composition, whereas physiological assessments on rowing ergometer included maximum oxygen uptake (VO2max) obtained during an incremental test, and average power output values obtained during a 2000m trial (W2000) and during a 20-sec (W20) and a 6…

The Total Work Measured During a High Intensity Isokinetic Fatigue Test Is Associated With Anaerobic Work Capacity.

2016

The purpose of the study was to determine whether total work measured during a high intensity isokinetic fatigue test (TWFAT) could be considered as a valid measure of anaerobic work capacity (AWC), such as determined by total work measured during a Wingate Anaerobic Test (TWWAnT). Twenty well-trained cyclists performed 2 randomly ordered sessions involving a high intensity isokinetic fatigue test consisting in 30 reciprocal maximal concentric contractions of knee flexors and extensors at 180°·s(-1), and a Wingate Anaerobic Test. We found that TWFAT of knee extensors was largely lower than TWWAnT (4151 ± 691 vs 22313 ± 2901 J, respectively, p0.05, Hedge's g = 4.27). Both measures were highl…

Modelling hydrolysis: Simultaneous versus sequential biodegradation of the hydrolysable fractions

2018

Hydrolysis is considered the limiting step during solid waste anaerobic digestion (including co-digestion of sludge and biosolids). Mechanisms of hydrolysis are mechanistically not well understood with detrimental impact on model predictive capability. The common approach to multiple substrates is to consider simultaneous degradation of the substrates. This may not have the capacity to separate the different kinetics. Sequential degradation of substrates is theoretically supported by microbial capacity and the composite nature of substrates (bioaccessibility concept). However, this has not been experimentally assessed. Sequential chemical fractionation has been successfully used to define i…

Do Women and Men over 70 Years Old Similarly Benefit from a One-Year Training Program?

2010

Background and Aims : Exercise capacity declines with age and is improved with exercise training. The aim of this study was to characterize the effects of a one-year combined exercise training in subjects over 70 years old, and to examine the eventual differences obtained between men and women. Methods : After baseline evaluation, 24 subjects (12 men and 12 women) over 70 years old underwent moderate intensity training with aerobic and resistance exercises, 3 hours a week over one year. Workload, oxygen uptake (VO2) and heart rate were measured during a symptom-limited exercise test. The distance walked in 6 minutes (6-MWT) was also registered, and the maximal strength was measured on knee …

Impact of anaerobic digestates on microbial communities of agricultural soils

2022

Anaerobic digestion of organic waste is considered as a key process to produce renewable energy to meet the growing sustainable energy demand. The residues of this anaerobic digestion, called digestates, can be used in agriculture as soil amendments and improve crop yields. However, the effect of digestates on soil biota, especially on microorganisms is still debated and needs to be better documented before their use at large scale in agricultural fields. The objective of the present thesis was to assess the effect of digestates on soil microbial community in different geographical and pedoclimatic contexts on the French territory. This thesis is divided in two parts. The first part takes p…