Permeabilization of bacterial membrane for biosensing and bioelectrochemical applications.

Department of Biological Sciencesclos

ELECTROLYTE COMPOSITION AND MICROBIAL FUEL CELLS COMPRISING THE SAME

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Composition for enhancing the sensitivity of a bioreactor strain that detects oxidative damage substances

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Approche par calculs fractionnaires du fluage viscoélastique non linéaire du bois d'Entandrophragma cylindricum (Sapelli)

International audienceWood is is emerging as a modern building material, and is becoming increasingly popular for structural use, not least because of its renewable nature, durability and ease of shaping. durability and ease of shaping. However, once it is in service, at room temperature and under low stresses, it warps and thus faces the problem of creep. problem of creep. In fact, the third phase of creep of creep can lead to the failure of the structural element, which can result in the ruin of the entire building. The first step in checking for this anomaly is to measuring the creep deformation. At the same time, it is essential to develop appropriate solutions, such as modelling and prediction, to deal with this potentially this potentially harmful phenomenon. Conventional rheological models for predicting prediction of creep have been the subject of several studies, some of which require a large number of parameters (Tagne, 2018). With a view to design prediction models with a reduced number of parameters and which, at the same time better represent the hereditary character of wood, fractional rheological models were developed (Krasnobrizha, 2016). The aim of this work is to model and predict predict the deformations of wood from Entandrophragma cylindricum (Sapelli) used in structures. For this purpose, Thomson's fractional fractional Thomson model is proposed.Le bois apparait aujourd’hui comme un matériau de construction moderne et s’impose davantage en structure notamment à cause de son caractère renouvelable, de sa durabilité et de sa mise en forme aisée. Cependant, une fois en service il flue à température ambiante et sous de faibles contraintes, se déforme et fait ainsi face au problème de fluage. De fait, la troisième phase du fluage peut conduire à la rupture de l’élément de structure, ce qui peut induire la ruine de tout l’édifice. Le premier stade du contrôle de cette anomalie est la mesure de la déformation de fluage. Parallèlement, Il est impératif de développer des solutions adéquates telles que la modélisation et la prédiction adressées à ce phénomène qui peut devenir nocif. Les modèles rhéologiques classiques de prédiction du fluage ont fait l’objet de plusieurs travaux qui pour certains requiert un grand nombre de paramètres (Tagne, 2018). Dans l’optique de concevoir des modèles de prédictions ayant un nombre réduit de paramètres et qui par la même occasion représentent mieux le caractère héréditaire du bois, les modèles rhéologiques fractionnaires ont vus le jour (Krasnobrizha, 2016). L’objectif de ce travail est de modéliser et de prédire les déformations du bois d’Entandrophragma cylindricum (Sapelli) utilisé en structure. Pour ce fait le modèle fractionnaire de Thomson est proposé

Compounds affecting predation by and viability of predatory bacteria

Bdellovibrio-and-like organisms (BALOs) are a small group of bacteria that actively predate on other Gram-negative bacterial species. Although viewed mostly in a positive light, such as their potential use as living antibiotics to reduce pathogenic strain populations, several studies have also highlighted the need to control their activities, such as in the production of biodiesel. Consequently, this mini-review discusses research being conducted to characterize compounds and environmental settings that influence predation rates and the mechanisms by which they accomplish this, with a heavy emphasis on studies published within the last decade. Key points center dot This review discusses bacterial predators and factors impacting their activities. center dot Emphasis is on recent articles, particularly those discussing prey metabolites. center dot The implications on possible applications of bacterial predators are discussed

M-THETA METHOD ON MODE I AND II FAILURE OF TWO CAMEROONIAN HARDWOODS IN BENDING

International audienceThis work deals with the numerical simulation on bending test to characterize two Cameroonian hardwoods under mode I and II loading for different crack lengths. The finite element analysis for fracture in orthotropic medium is developed. The algorithm of fracture is introduced in a finite element software Cast3M. According to the Mtheta method, the calculation of the stress intensity factors and the energy release rate for pure mode I and II fracture are deduced using a SENB (Single Edge Notch Bending) specimen. The path independence of Mθ-method on the specimen is confirmed

Sensitivity of predatory bacteria to different surfactants and their application to check bacterial predation

We evaluated the toxicity of surfactants against different predatory bacteria. Tests with Bdellovibrio bacteriovorus HD100 and SDS, an anionic surfactant, showed the predator was very sensitive; 0.02% SDS completely killed the predatory population (7-log loss; < 10 PFU/ml remaining) both when free-swimming or within the bdelloplast, i.e., intraperiplasmic. Similar results were also observed with B. bacteriovorus 109J and Peredibacter starrii. In contrast, none of the prey (E. coli, Klebsiella pneumoniae, Acinetobacter baumannii, or Pseudomonas sp. DSM 50906) viabilities were negatively affected by SDS. Triton X-100, a nonionic surfactant, was slightly less toxic towards B. bacteriovorus HD100 (viability loss of only 4-log), while two cationic surfactants, i.e., benzalkonium chloride (BZC) and cetyltrimethylammonium bromide (CTAB), were toxic towards both the predator and prey. Based on the above findings, we tested the potential use of SDS as a means to control predation. Addition of 0.02% SDS immediately halted predation based upon the prey bioluminescence, which leveled off and remained steady. This was confirmed using the predator viabilities; no predators were found in any of the samples where SDS was added. Consequently, low concentrations of SDS can be used as a simple means to control B. bacteriovorus HD100 activities