Search results for "plastic"
showing 10 items of 7296 documents
Genetic plasticity of atrazine-degrader: evidence for the deletion of atzABC genes in pseudomonas sp. adp in response to cyanuric acid selection pres…
2010
International audience; Several bacterial strains are known to metabolize s-triazines herbicides among which atrazine reported worldwidel to contaminate soil and water resources. The complete mineralization of atrazine to carbon dioxide and ammonium is catalyzed by 6 hydrolytic enzymes encoded by atzABCDEF genes located on the plasmid pADP1 in Pseudomonas ADP. The atzABC genes code for the upper pathway transforming atrazine to cyanuric acid, while the atzDEF genes code for the lower pathway transforming cyanuric acid to simple compounds. In order to study the genetic plasticity of the atrazine catabolic pathway, we performed an in vitro evolution study consisting in applying a continuous s…
Mise au point d’une méthode de caractérisation morphologique de cultures et d’adventices en vue de modéliser leur aptitude de réponse à la lumière
2017
EASPEGESTAD INRA; La modélisation, et plus particulièrement le modèle de prédiction de flore adventice FLORSYS, nécessite l’acquisition constante de données sur la croissance et la plasticité morphologique d’espèces cultivées et d’adventices. Nous avons mis au point une méthodologie basée sur de l’expérimentation en parcelles jardinées pour quantifier la croissance et la plasticité morphologique des espèces dans des conditions contrastées de lumière. Les données sont obtenues par des mesures de surfaces foliaires, de hauteurs et envergures des plantes, des pesées de biomasse, et par analyse de photographies via les logiciels Matlab et ImageJ. Nous montrerons les résultats pour quelques espè…
Méthodes et protocole de numérisation 3D appliqués à l’étude scientifique des figurines en terre cuite découvertes sur le site de la Genetoye à Autun…
2023
A white terracotta figurines production at the Genetoye site in Autun
2017
National audience; La fouille en 2014 d’un secteur du quartier artisanal de la Genetoye a permis de mettre au jour un riche et abondant mobilier de coroplastie. Composé de 190 individus, ce corpus, actuellement en cours d’étude, permet d’ores et déjà d’en savoir plus sur la production de figurine en terre cuite à la Genetoye et plus largement sur la ville d’Autun-Augustodunum.
L'immigration dans quelques communes de la banlieue ouest : Asnières, Nanterre et Puteaux de 1830 à 1930
1990
A study of immigration for the period 1 830-1 930 for three communes in the western suburbs of Paris has been undertaken with the aid of official marriage certificates. The study tends to show that each suburban commune's immigrants, coming primarily from the provinces and secondarily from Paris, have been chosen to some extent since they reflect the economic activities and the social composition of the population of the commune of arrival. This selection occuring within national migration streams seems to favour the migrants insertion, at least until the beginning of the twentieth century.
Effet de l'humidité sur la réponse à l'ammoniac de capteurs conductimétriques à base de matériaux moléculaires
2012
Many ammonia sensors are available but the consideration of the humidity effect is scarcely insured even by manufacturers. The aim of this thesis is to propose a conductimetric transducer capable tomeasure ammonia selectively, with enough accuracy for air quality control, in a variable humidity environment. To reach this goal, we used thin film resistors made of cobalt phthalocyanines as semiconductor. This study deals with thin films processing made by vacuum evaporation, solventcast and electrodeposition. Automated workbenches were developed to perform electrical measurements under argon and to study the response of sensors to dry or humid ammonia by meansof 1 min / 4 min-long exposure / …
MULTI AXIAL TESTING OF ADHESIVELY BONDEDJOINTS OF FIBER REINFORCED THERMOPLASTIC POLYMERS
2015
International audience; In order to predict the mechanical behaviorof adhesively bonded joints, it is necessary to develop robust numerical models.This robustness is only reached if an extensive experimental database with tensile, shear and complex combined peel and shear loads can beestablished. The purpose of this study is to present a multi axialdevice for testing adhesively bonded joints, using KS2-type specimens traditionally utilized for spot-weld characterization. The tests were conducted on a glass fiber reinforced thermoplastic polymer(PA6-6) composite adhesively bonded with a flexible polyurethane adhesive. This adhesive/substrate combination allowsshort process times and good per…
Acetone Vapor-Sensing Properties of Chitosan-Polyethylene Glycol Using Surface Plasmon Resonance Technique
2020
To non-invasively monitor and screen for diabetes in patients, there is need to detect low concentration of acetone vapor in the range from 1.8 ppm to 5 ppm, which is the concentration range of acetone vapor in diabetic patients. This work presents an investigation for the utilization of chitosan-polyethylene glycol (PEG)-based surface plasmon resonance (SPR) sensor in the detection of trace concentration acetone vapor in the range of breath acetone in diabetic subjects. The structure, morphology, and elemental composition of the chitosan-PEG sensing layer were characterized using FTIR, UV-VIS, FESEM, EDX, AFM, and XPS methods. Response testing was conducted using low concentration of aceto…
Hydrothermal Ageing Effect on Reinforcement Efficiency of Nanofibrillated Cellulose/Biobased Poly(butylene succinate) Composites
2022
Nanofibrillated cellulose (NFC) is a sustainable functional nanomaterial known for its high strength, stiffness, and biocompatibility. It has become a key building block for the next-generation of lightweight, advanced materials for applications such as consumer products, biomedical, energy storage, coatings, construction, and automotive. Tunable and predictable durability under environmental impact is required for high performance applications. Bio-based poly (butylene succinate) (PBS) composites containing up to 50% NFC content were designed and aged in distilled water or at high relative humidity (RH98%). PBS/NFC composites are characterized by up to 10-fold increased water absorption ca…
Adipose-derived stem cells
2013
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