Comptes Rendus Chimie最新文献

{"title":"Effects of Lagarosiphon major extracts on the metabolome and photosynthesis of Microcystis aeruginosa","authors":"Juliette Tison-Rosebery, Sylvia Moreira, Mélissa Eon, Lucie Campillo, Samuel Maubert, Carmen Malepeyre, Julien Célerier, Vincent Sol, Jacky Vedrenne, Vincent Bertrin, Nicolas Creusot","doi":"10.5802/crchim.250","DOIUrl":"https://doi.org/10.5802/crchim.250","url":null,"abstract":"Over the last decades, Aquitaine lakes have been exposed to growing biomasses of invasive macrophytes, in particular Lagarosiphon major, and to frequent blooms of the cyanobacteria Microcystis aeruginosa. Our aim was to explore the potential role of L. major in the regulation of such blooms, through allelopathic interactions. Experiments consisted of exponential growth phase cells incubated for 96 h in L. major extracts at increasing concentrations. Our approach was based on untargeted metabolomics and photosynthetic activity measurements.We demonstrated the anticyanobacterial properties of L. major extracts. In particular, we reported that L. major extracts inhibited M. aeruginosa photosynthesis, and affected the production of various metabolite classes and pathways mainly involved in the secondary metabolism of the cyanobacteria.We further provided clear evidence about the existence of metabolite classes in L. major that may be involved in allelopathic interactions with M. aeruginosa, such as caffeic acid. Supplementary Materials: Supplementary materials for this article are supplied as separate files: crchim-250-suppl.pdf Table-S6.xlsx Table-S7.xlsx Table-S8.xlsx Au cours des dernières décennies, les lacs aquitains ont été exposés à un développement croissant de macrophytes invasives, en particulier Lagarosiphon major, et à de fréquentes proliférations de cyanobactéries (Microcystis aeruginosa). Notre objectif dans cette étude est d’explorer le rôle potentiel de L. major dans la régulation de ces proliférations, via la synthèse de composés bioactifs. Les expériences ont consisté à incuber pendant 96 h des cultures de cyanobactéries en phase de croissance exponentielle avec des extraits de L. major à différentes concentrations. Notre approche se base sur la combinaison de métabolomique non ciblée et de mesures d’activité photosynthétique.Nos résultats mettent en évidence les propriétés anti-cyanobactéries des extraits de L. major. En particulier, nous démontrons que les extraits de L. major inhibent la photosynthèse de M. aeruginosa et affectent la production de diverses classes de metabolites, ainsi que certains pathways impliqués dans le métabolisme secondaire des cyanobactéries.Enfin, nous apportons la preuve de de l’existence chez L. major de classes de métabolites qui pourraient être impliqués dans des interactionsde type allélopathique avec M. aeruginosa. Compléments : Des compléments sont fournis pour cet article dans les fichiers suivants : crchim-250-suppl.pdf Table-S6.xlsx Table-S7.xlsx Table-S8.xlsx","PeriodicalId":10577,"journal":{"name":"Comptes Rendus Chimie","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134912210","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Experimental evidences of radicals production by hydrodynamic cavitation: a short review","authors":"Julius-Alexander Nöpel, Frédéric Ayela","doi":"10.5802/crchim.244","DOIUrl":"https://doi.org/10.5802/crchim.244","url":null,"abstract":"The presence of induced radicals and of chemical reactions, in liquids processed in ultrasonic reactors producing acoustic cavitation, has been widely demonstrated and is known as sonochemistry. Otherwise, the number of publications related to chemical reactions caused by hydrodynamic cavitation arising in a liquid flowing out, is more limited. Most of these articles have exposed qualitative results and empirical attempts in order to increase a primary weak efficiency. As the physics of collapsing bubbles in a flow is more complex than the monitoring of acoustic bubbles at a fixed frequency, it was largely assumed, until shortly, that hydrodynamic cavitation has inherent limitations preventing from getting relevant radical yields. However, new efforts have been recently performed to evolve from qualitative to quantitative measurements, in order to be able to know whether hydrodynamic cavitation could become a reliable process for wastewater treatment or not. This short review focuses on recent progresses that have made possible experimental evidences of radical production in hydrodynamic cavitation, and on forthcoming orientations. La présence de radicaux et de réactions chimiques, dans des liquides traités dans des réacteurs ultrasoniques produisant de la cavitation acoustique, a été largement démontrée et est connue sous le nom de sonochimie. Mais par ailleurs, le nombre de publications consacrées aux réactions chimiques provoquées par la cavitation hydrodynamique dans un écoulement est plus limité. La plupart de ces articles exposent des résultats qualitatifs et des tentatives empiriques visant à accroître une efficacité intrinsèquement faible. Comme la physique de l’effondrement d’une bulle dans un écoulement est plus complexe que celle d’une bulle excitée à une fréquence acoustique fixe, on supposait jusqu’à présent que la cavitation hydrodynamique était intrinsèquement incapable de produire des radicaux avec un rendement significatif. Cependant, de nouvelles démarches ont été récemment suivies pour évoluer vers des mesures quantitatives, afin de savoir si la cavitation hydrodynamique pouvait devenir, ou pas, un processus fiable pour le traitement des eaux usées. Cette brève revue souligne les progrès récents qui ont permis d’obtenir des preuves expérimentales de la production de radicaux en cavitation hydrodynamique, et sur les futures orientations à suivre.","PeriodicalId":10577,"journal":{"name":"Comptes Rendus Chimie","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135781773","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Aquathermolysis of heavy oil catalyzed by transition metal salts and clay","authors":"Yingna Du, Liyuan Zhang, Rui Jing, Yongfei Li, Bo Yang, Gang Chen","doi":"10.5802/crchim.237","DOIUrl":"https://doi.org/10.5802/crchim.237","url":null,"abstract":"Currently, researchers have indicated that inorganic minerals in reservoirs, such as clay minerals, carbonates and quartz, can catalyze the evolution of organic matter into oil and gas. Therefore it is reasonable to believe that the minerals in reservoirs may act as a catalyst support with the metal-containing catalyst added from outside during the thermal recovery of heavy oil. This paper studied the aquathermolysis of heavy oil catalyzed by minerals and transition metal. The reaction conditions of two heavy oil samples were investigated. The results show that the optimal reaction conditions of heavy oil from Xinjiang Baikouquan Oilfield (XBO) are the reaction temperature of 250 °C and the reaction time of 6 h; for the crude oil from Xinjiang Tahe Oilfield (XTO), the optimal reaction conditions are determined to be the reaction temperature of 250 °C and the reaction time of 12 h, the water–oil ratio of the two oils is 0.3. Under optimal conditions, viscosity and pour point of heavy oil are significantly reduced. Differential scanning calorimetry (DSC), GC-MS analysis, thermogravimetric analysis (TGA), and elemental analysis were used to study the properties of the two heavy oil samples before and after reaction to explore the mechanism of the catalyzed aquathermolysis of heavy oil. This work will benefit the related heavy oil recovery work in this field. Des travaux récents indiquent que les minéraux inorganiques présents dans le gisement, tels que les minéraux argileux, les carbonates et le quartz, peuvent catalyser l’évolution de la matière organique en pétrole et en gaz. Il est donc raisonnable de penser que ces minéraux peuvent agir comme cocatalyseurs avec le catalyseur ajouté pendant la récupération thermique du pétrole lourd. Cet article a étudié l’aquathermolyse de pétrole lourd catalysée par des minéraux et des métaux de transition. Les conditions de réaction de deux échantillons de pétrole lourd ont été étudiées. Les résultats montrent que les conditions optimales de réaction du pétrole lourd du champ pétrolifère de Xinjiang Baikouquan (XBO) sont une température de réaction de 250 °C et un durée de réaction de 6 heures ; pour le pétrole brut du champ pétrolifère de Xinjiang Tahe (XTO), les conditions optimales de réaction sont une température de réaction de 250 °C et une durée de réaction de 12 heures, le rapport eau-huile des deux pétroles est de 0,3. Dans les conditions optimales, la viscosité et le point d’écoulement du pétrole lourd sont considérablement réduits. La calorimétrie différentielle à balayage (DSC), l’analyse GC-MS, l’analyse thermogravimétrique (TGA) et l’analyse élémentaire ont été utilisées pour étudier les propriétés des deux échantillons de pétrole lourd avant et après la réaction afin d’explorer le mécanisme de l’aquathermolyse catalysée du pétrole lourd. Ce travail est une contribution au domaine de la récupération du pétrole lourd.","PeriodicalId":10577,"journal":{"name":"Comptes Rendus Chimie","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135740867","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Indium-catalysed ring opening of 2-hydroxybutyrolactone through the cleavage of C(sp 3 )–O bond","authors":"Sameh Aoun, Joe Massouh, Noémie Scornet, Laurent Giordano, Alphonse Tenaglia, Gérard Buono, Patrick Rey, Virginie Bellière-Baca, Damien Hérault","doi":"10.5802/crchim.245","DOIUrl":"https://doi.org/10.5802/crchim.245","url":null,"abstract":"","PeriodicalId":10577,"journal":{"name":"Comptes Rendus Chimie","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135984332","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Electrogeneration of non-electroactive and non-conducting materials: a counterintuitive concept for the functionalization and nanostructuration of electrode surfaces","authors":"Alain Walcarius","doi":"10.5802/crchim.242","DOIUrl":"https://doi.org/10.5802/crchim.242","url":null,"abstract":"","PeriodicalId":10577,"journal":{"name":"Comptes Rendus Chimie","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135982150","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Slow pyrolysis of orange peels blended with agro-food wastes: characterization of the biochars for environmental applications","authors":"Sana Kordoghli, Emna Fassatoui, Jean François Largeau, Besma Khiari","doi":"10.5802/crchim.240","DOIUrl":"https://doi.org/10.5802/crchim.240","url":null,"abstract":"The main objective of this research is to explore the viability of adequate blends of orange peels with some abundant bio-wastes, such as date pits, peanut shells, coffee grounds, and tea waste, to generate bio-chars while applying a thermal pyrolysis process. It was revealed that pure orange peels lead to a high biochar yield (32.05%). The different blends with orange peels did not show significantly increased char output. However, the biochar yields were lower with coffee grounds and date pits, which shows the positive effect of blending with orange peels for these two biomasses as far as char is concerned. However, the blends appeared to favour syngas production with yields as high as 56% for the coffee grounds and orange peels blend. FTIR and SEM characterizations indicated that recovered solids could represent a viable source of carbon materials, biofertilizers, or solid fuels.","PeriodicalId":10577,"journal":{"name":"Comptes Rendus Chimie","volume":"63 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135150587","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Plant volatiles play differential roles in pre and post alighting phases in a specialist phytophagous insect","authors":"Kathleen Menacer, Maxime Hervé, Benoit Lapeyre, Manon Vedrenne, Anne Marie Cortesero","doi":"10.5802/crchim.233","DOIUrl":"https://doi.org/10.5802/crchim.233","url":null,"abstract":"Plant volatile organic compounds (VOCs) can influence the behavior of insects but distance and contact effects are rarely distinguished. We aimed to identify VOCs that mediate attraction and oviposition behaviors of the cabbage root fly, and to distinguish whether their effect applies at distance or at contact. Headspace collections of host-emitted VOCs were performed and analyzed in combination with electro-antennogram detection. The behavioral effect of the electrophysiologically-active VOCs was assessed in behavioral experiments. We show that VOCs act mainly when in mixtures, and have effects either at distance or at contact, but not both. Supplementary Materials: Supplementary material for this article is supplied as a separate file: crchim-233-suppl.pdf Les composés organiques volatils (COV) des plantes peuvent influencer le comportement des insectes, mais les effets de ces composés à distance et au contact des plantes sont rarement distingués. Nous avons cherché à identifier les COV qui influencent les comportements d’attraction et d’oviposition de la mouche du chou Delia radicum, et à déterminer si leur effet s’applique à distance ou au contact. Les COV émis par différents hôtes ont été échantillonnés dans l’espace de tête des plantes et analysés en combinaison avec des analyses d’électro-antennographie (EAD). L’effet des COV actifs sur le plan électrophysiologique a été évalué dans des expériences comportementales. Nous montrons que les COV agissent principalement en mélange et qu’ils ont des effets soit à distance, soit au contact, mais pas les deux à la fois. Compléments : Des compléments sont fournis pour cet article dans le fichier séparé : crchim-233-suppl.pdf","PeriodicalId":10577,"journal":{"name":"Comptes Rendus Chimie","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136106872","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Influence of sulfate-reducing bacteria on the biocorrosion of mild steel coated with hybrid polyetherimide-ZnO or CuO bilayer composites","authors":"Emna Rahali, Leila El-Bassi, Latifa Bousselmi, Marta M. Alves, Maria de Fátima Montemor, Hanene Akrout","doi":"10.5802/crchim.227","DOIUrl":"https://doi.org/10.5802/crchim.227","url":null,"abstract":"Mild steel (MS) coated with protective bilayer hybrid coatings of polyetherimide, and ZnO/CuO was exposed to artificial treated wastewater (ATWW) inoculated with Desulfovibrio sp. (biotic system). Proteins from the extracellular polymeric substances (EPS) matrix of Desulfovibrio sp. responded to the coatings. PEI-CuO offered the highest performance against biocorrosion. The higher PEI-CuO resistivity value of 2.17×10 6 Ω·cm 2 contrasted with the decrease to 1.5×10 5 and 1.6×10 3 Ω·cm 2 for PEI-ZnO and PEI coatings, respectively. The one order of magnitude increased resistance of the biotic system, compared to sterilized ATWW (abiotic system), resulted from the protective nature of the bacterial biofilm. Supplementary Materials: Supplementary material for this article is supplied as a separate file: crchim-227-suppl.pdf L’acier doux (MS) recouvert de revêtements hybrides bicouches protecteurs de polyétherimide et de ZnO/CuO a été exposé à des eaux usées artificielles (ATWW) inoculées par Desulfovibrio sp. (système biotique). Les protéines de la matrice des substances polymères extracellulaires (EPS) de Desulfovibrio sp. ont réagi aux revêtements. Le PEI-CuO a offert les meilleures performances contre la biocorrosion. La valeur de résistivité plus élevée de PEI-CuO de 2,17×10 6 Ω·cm 2 contraste avec la diminution à respectivement 1,5×10 5 et 1,6×10 3 Ω·cm 2 pour les revêtements PEI-ZnO et PEI. La résistance accrue d’un ordre de grandeur du système biotique, par rapport à l’ATWW stérilisé (système abiotique), résulte de la nature protectrice du biofilm bactérien. Compléments : Des compléments sont fournis pour cet article dans le fichier séparé : crchim-227-suppl.pdf","PeriodicalId":10577,"journal":{"name":"Comptes Rendus Chimie","volume":"321 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134994022","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}