Relevant bibliographies by topics / Processus aminci

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Processus aminci'

Author: Grafiati
Published: 4 June 2021
Last updated: 10 February 2022

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Journal articles on the topic "Processus aminci"

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Kassler, Alexander, Ernst Pittenauer, Nicole Doerr, and Guenter Allmaier. "Development of an accelerated artificial ageing method for the characterization of degradation products of antioxidants in lubricants by mass spectrometry." European Journal of Mass Spectrometry 25, no. 3 (2018): 300–323. http://dx.doi.org/10.1177/1469066718811714.

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The understanding of ageing mechanisms of antioxidants in base oils is indispensable for the development of improved lubricants. In this study, a novel artificial ageing method based on the application of peroxide as oxidant is presented for improved monitoring of thermo-oxidative degradation processes in combination with mass spectrometry. Model oils containing aminic and phenolic antioxidants were aged and chemical structures of their oxidation products were elucidated by ultrahigh performance liquid chromatography and electrospray ionization high resolution (Orbitrap) mass spectrometry. Additionally, synergistic mixtures of four antioxidants were investigated, because the formation of condensed molecules from amines and phenols would have a major influence on the antioxidant potential but could not be detected in the bulk lubricant.
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Gudkova, O. O., N. V. Latyshko, and S. G. Shandrenko. "Amine oxidases as important agents of pathological processes of rhabdomyolysis in rats." Ukrainian Biochemical Journal 88, no. 1 (2016): 79–87. http://dx.doi.org/10.15407/ubj88.01.079.

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Kovács, Barbara, Nikoletta Hegedűs, Mihály Bálint, et al. "Penicilliumantifungal protein (PAF) is involved in the apoptotic and autophagic processes of the producerPenicillium chrysogenum." Acta Microbiologica et Immunologica Hungarica 61, no. 3 (2014): 379–88. http://dx.doi.org/10.1556/amicr.61.2014.3.10.

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Doyle, Michael G. J., and Rylan J. Lundgren. "Oxidative cross-coupling processes inspired by the Chan–Lam reaction." Chemical Communications 57, no. 22 (2021): 2724–31. http://dx.doi.org/10.1039/d1cc00213a.

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This feature article describes our discovery and application of Cu-catalyzed oxidative coupling reactions of activated methylene derivatives or carboxylic acids with nucleophiles including aryl boronic esters and amines.
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Diamante, Borges, Silva, et al. "Bioactive Amines Screening in Four Genotypes of Thermally Processed Cauliflower." Antioxidants 8, no. 8 (2019): 311. http://dx.doi.org/10.3390/antiox8080311.

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Biogenic amines are important indicators of food quality with recognized antioxidant capacity. Diets that are rich in these compounds promote several benefits for human health, although the consumption in excess may result in food poisoning. This study aims to screen the levels of biogenic amines in four colored cauliflowers, before and after cooking (boiling, steaming, and microwaving). In addition, the levels of tryptophan and 5-hydroxytryptophan, two serotonin precursors, were analyzed. Our results reveal that thermal processing shows a tendency to increase tryptophan levels and reduce 5-hydroxytryptophan in colored cauliflowers. A reduction of the tryptophan and increase in serotonin contents in ‘Cheddar’, steamed or microwaved, was observed. A higher level of histamine was observed in the genotype ‘Forata’ after cooking, whereas melatonin levels were higher after steaming and microwaving. The lowest levels of biogenic amines and amino acids were observed in ‘Graffiti’. All the colored cauliflowers that were analyzed presented a chemical quality index (CQI) below the pre-established limits, indicating that are safe for consumption, even after cooking. We conclude that the levels of biogenic amines and amino acids in colored cauliflower are safe for human consumption and do not present health risks. Therefore, the consumption of these genotypes, raw or cooked, is a good source of bioactive compounds.
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Kočar, Drago, Sevim Köse, Bekir Tufan, Andrej Ščavničar, and Matevž Pompe. "Determination of Biogenic Amines in Fresh Fish and Processed Fish Products Using IC-MS/MS." Foods 10, no. 8 (2021): 1746. http://dx.doi.org/10.3390/foods10081746.

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A new method was proposed for the determination of underivatized biogenic amines based on ion-exchange chromatography coupled with mass spectrometry detection. The method was applied to the analysis of 10 biogenic amines in fresh and processed fish products. The amines were extracted from muscle tissue with water without any additional derivative step or sample clean-up. Separation of biogenic amines was done by the IonPac (4 × 50 mm) column, applying a gradient eluent by mixing formic acid (2 mol L−1) and Milli-Q water (formic acid concentration from 400 mM to 2 M). The results demonstrated a linear response in the range of 0.01 to 10 mg L−1. The detection limits for the fish products ranged from 20 ng/g up to around 400 ng/g for histamine and putrescine, respectively. Spermidine and spermine showed significantly higher detection limits. This current method can be used for the determination of biogenic amines in both fresh and processed fish products for regulatory purposes and monitoring food-safety issues relating to these amines, particularly histamine. It is also a useful method for evaluation of other commercial analytical test kits and commonly used methods that are possibly affected by the food matrix due to processing or other drawbacks arising from the derivatization process.
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Komprda, T., K. Novická, L. Kalhotka, and D. Smělá. "Biogenic amine content in sterilised and pasteurised long-term stored processed cheese." Czech Journal of Food Sciences 23, No. 5 (2011): 209–16. http://dx.doi.org/10.17221/3393-cjfs.

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The contents of eight biogenic amines (tryptamine, phenylethylamine, histamine, tyramine, putrescine, cadaverine, spermidine and spermine) were determined in samples of processed cheese, either pasteurised (P) or sterilised (S), and consequently stored for either 22 or 57 weeks at the temperatures of 8°C and 22°C, respectively. Tyramine was quantitatively the most important biogenic amine (1.3–29.3 mg/kg); the highest level (P < 0.05) was found in P cheese stored for 22 weeks after processing at 8°C (P1). Regardless of tyramine, and with the exception of putrescine in S cheese stored for 57 weeks (2.2 mg/kg), the content of no biogenic amine exceeded 2 mg/kgin any tested sample. Significantly higher (by five to six orders of magnitude; P < 0.05) counts of total aerobic and facultative anaerobic microorganisms in P1 sample in comparison with all other samples were indicative of the cover leakage. No lactic acid bacteria were detected in any sample, the counts of coliforms and total anaerobes, respectively, were negligible and did not differ (P> 0.05) between samples. No sample of the tested long-term stored processed cheese was considered unsafe from the toxicological viewpoint.    
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Apryatin, Sergey A., Marina N. Karpenko, Zamira M. Muruzheva, Maria V. Bolshakova, Daria N. Magazenkova, and Victor M. Klimenko. "Neurodegenerative and metabolic disorders, mediated by the trace amines and their receptors." Medical academic journal 20, no. 1 (2020): 9–22. http://dx.doi.org/10.17816/maj25746.

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The aim of the study is the modern scientific literature estimation in the field of the investigation of neurodegenerative and metabolic disorders mediated by the trace amines and their receptors. The analysis of modern ideas about the feedback of neurodegenerative and metabolic diseases in which the trace amines and their receptors are involved was carried out. The important role of trace amines and their receptors in the regulation of the dopamine system, in connection with metabolic and neurodegenerative diseases, including Parkinsons disease, ADHD, schizophrenia, obesity, metabolic syndrome and other pathological conditions, has been shown. Trace amines and their receptors have a direct effect on dopamine systems, being regulators of various metabolic and neurodegenerative processes, participating in energy metabolism, neurogenesis, and other vital processes.
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You, Y., V. P. Kanawade, J. A. de Gouw, et al. "Atmospheric amines and ammonia measured with a chemical ionization mass spectrometer (CIMS)." Atmospheric Chemistry and Physics 14, no. 22 (2014): 12181–94. http://dx.doi.org/10.5194/acp-14-12181-2014.

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Abstract. We report measurements of ambient amines and ammonia with a fast response chemical ionization mass spectrometer (CIMS) in a southeastern US forest and a moderately polluted midwestern site during the summer. At the forest site, mostly C3-amines (from pptv to tens of pptv) and ammonia (up to 2 ppbv) were detected, and they both showed temperature dependencies. Aerosol-phase amines measured thermal-desorption chemical ionization mass spectrometer (TDCIMS) showed a higher mass fraction in the evening with cooler temperatures and lower in the afternoon with warmer temperatures, a trend opposite to the gas-phase amines. Concentrations of aerosol-phase primary amines measured with Fourier transform infrared spectroscopy (FTIR) from micron and submicron particles were 2 orders of magnitude higher than the gas-phase amines. These results indicate that gas to particle conversion is one of the major processes that control the ambient amine concentrations at this forest site. Temperature dependencies of C3-amines and ammonia also imply reversible processes of evaporation of these nitrogen-containing compounds from soil surfaces in daytime and deposition to soil surfaces at nighttime. During the transported biomass burning plume events, various amines (C1–C6) appeared at the pptv level, indicating that biomass burning is a substantial source of amines in the southeastern US. At the moderately polluted Kent site, there were higher concentrations of C1- to C6-amines (pptv to tens of pptv) and ammonia (up to 6 ppbv). C1- to C3-amines and ammonia were well correlated with the ambient temperature. C4- to C6-amines showed frequent spikes during the nighttime, suggesting that they were emitted from local sources. These abundant amines and ammonia may in part explain the frequent new particle formation events reported from Kent. Higher amine concentrations measured at the polluted site than at the rural forested site highlight the importance of constraining anthropogenic emission sources of amines.
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Basak, Shyam, Laura Winfrey, Betty A. Kustiana, Rebecca L. Melen, Louis C. Morrill, and Alexander P. Pulis. "Electron deficient borane-mediated hydride abstraction in amines: stoichiometric and catalytic processes." Chemical Society Reviews 50, no. 6 (2021): 3720–37. http://dx.doi.org/10.1039/d0cs00531b.

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Borane mediated hydride abstraction of amines efficiently generates useful iminium salts. This review explores this fascinating reactivity and discusses how the iminium intermediates are utilised in a variety of stoichiometric and catalytic processes.
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Dissertations / Theses on the topic "Processus aminci"

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Crétois, Emmanuelle. "Utilisation de la méthode des pas aléatoires en estimation dans les processus ponctuels." Rouen, 1994. http://www.theses.fr/1994ROUE5022.

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Dans ce travail, nous estimons la densité moyenne d'un processus ponctuel de Poisson au moyen d'une partition aléatoire, c'est-à-dire une partition en intervalles dont les extrémités sont certains points de l'échantillon. Nous utilisons successivement la méthode de l'histogramme à pas aléatoires, des splines cubiques à pas aléatoires, de la fenêtre mobile aléatoire et du noyau à pas aléatoires. Nous nous intéressons aussi au cas du processus mixte de Poisson, à un cas particulier du processus mixte de Poisson, le processus de loi binomiale négative, et au cas où la densité moyenne du processus est discontinue. Enfin, nous étendons la méthode de la partition aléatoire à l'estimation de la fonction d'amincissement d'un processus de Poisson aminci, et des mesures de Palm réduites d'un processus de Cox
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Wang, Nan. "CO2 Separation - from Aqueous Amine Solvent to Ionic Liquid-based solvent." Licentiate thesis, Luleå tekniska universitet, Energivetenskap, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-84244.

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Amin, Azzam. "Dynamique interculturelle et processus d'interculturation : représentations sociales, identifications et sentiment d’exclusion, le cas des jeunes Français issus de l’immigration maghrébine et turque." Lyon 2, 2007. http://theses.univ-lyon2.fr/documents/lyon2/2007/amin_a.

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L'histoire des jeunes français issus de l'immigration est complètement différente de celle de leurs parents. Les processus acculturatifs de cette dernière se sont fait dans un silence social et politique total ne soulevant ni polémique, ni recherche intensive, alors que leurs enfants, plus visibles et contestataires, continuent à solliciter à ce jour les préoccupations des chercheurs en Sciences Humaines. Enjeu politique ou électoral, ils sont devenus malgré eux un objet d'ethnicisation des rapports sociaux, culturels et économiques propice à toutes les simplifications et toutes les dérives. Cette thèse explore dans une approche psychosociale interculturelle les facteurs déterminants dans les processus identitaires des personnes nées et ayant grandis dans une situation de contact de cultures. Nous avons choisi de travailler sur le sentiment d'exclusion, les représentations sociales de la société française, les orientations identitaires et les choix identificatoires. La population de cette recherche est constituée de 334 jeunes français issus de l'immigration maghrébine et 158 issus de l'immigration turque, filles et garçons, âgés de 15 à 25 ans. Afin d'évaluer les processus étudiés, nous avons procédé à la construction d'un outil de recherche multidimensionnel (questionnaire, échelles, test "Qui suis-je ?"). Les résultats ont mis en évidence les caractères dynamiques et stratégiques de l'identité qui naissent de l'interaction sociale dans une situation interculturelle. L'approche comparative adoptée et les croisements des variables de l'origine, du sexe et de l'âge ont permis de mettre en lumière les dimensions macro-sociales et la perception des rapports sociaux comme cadre explicatif de l'individu
The history of young French people born to parents who have settled in France is completely different from that of their parents. The acculturation processes involved in their parents’ history have occurred in a complete social and political silence, raising neither polemic nor intensive research. By contrast, children are more visible, they protested and up to now they continue to request the attention of researchers in social sciences. As a political and electoral stake, they have unwillingly become an object of ethnicisation of the social, cultural and economic relationships. Such a position became susceptible to simplifications and drifts. This thesis explores, with a cross-cultural and psychosocial approach, the factors determining the processes involved in the identity construction of people who were born and grew up in conditions of cultural contact. We have chosen to work on the feelings of exclusion, social representations in the French society, identity-making orientations and the choices of identification. The participants in this research are young French people, 334 of whom issued from Maghrebian immigration and 158 from Turkish immigration, girls and boys. Their ages ranged between 15 and 25 years old. In order to evaluate the studied processes, we have built up a multidimensional research tool (questionnaire, scales, “Who am I ?” test). The results highlight the dynamic and strategic characters of identity, which result from social interactions in a cross-cultural situation. The comparative approach that was adopted and the intersection of the variables (i. E. Origin, sex and age) made it possible to clarify how the macro-social dimensions and the way social relationships are perceived may constitute a framework to understand the individual
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Franchino, Allegra. "New asymmetric metal-catalysed addition processes for amine synthesis." Thesis, University of Oxford, 2017. https://ora.ox.ac.uk/objects/uuid:c8207684-596d-4fb8-b93e-292911b45b5d.

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This thesis concerns the development of novel catalytic approaches for the construction of stereocentres bearing a nitrogen atom. In 2011, the Dixon group reported a Ag(I)/cinchona-derived amino phosphine catalytic system for the activation of isocyanoacetates in asymmetric aldol and Mannich reactions. During this thesis work it was sought to extend the scope of this catalytic system to Mannich additions of other isocyanide pronucleophiles, then the focus was broadened to include Reformatsky and α-alkylation reactions of ketimine substrates. Chapter 1 gives an overview of the state of the art with particular emphasis on catalytic enantioselective additions to ketimines and the use of activated isocyanides as pronucleophiles. Chapter 2 describes the application of the Ag-catalysed enantio- and diastereoselective aldol reaction of isocyanoacetates to the concise asymmetric synthesis of the antibiotic chloramphenicol, which possesses a chiral stereodefined α-amino β-hydroxy motif. Chapter 3 details our efforts to expand the scope of the Ag(I)/amino phosphine catalytic system to the activation of more challenging isocyanides lacking an electron-withdrawing group in the α-position by investigating aldol and Mannich reactions of benzyl isocyanide. Chapter 4 describes how the scope of the Ag(I)/amino phosphine catalytic system was successfully extended to another pronucleophile, the versatile p-toluenesulfonylmethyl isocyanide (TosMIC). The first catalytic enantio- and diastereoselective addition of TosMIC to N-diphenylphosphinoyl (N-DPP) ketimines was developed, affording 2-imidazolines possessing two contiguous stereocentres with high yields and excellent levels of stereocontrol. Chapter 5 describes the development of a Ni(II)-catalysed Reformatsky reaction of N-DPP ketimines with ethyl bromoacetate and diethylzinc, providing racemic amines bearing a quaternary stereocentre in the α-position in good yields. Chapter 6 reports the serendipitous discovery of the α-alkylation of N-DPP ketimines with ethyl bromoacetate using visible light photoredox catalysis. The transformation, catalysed by ruthenium(II) and nickel(II) complexes under mild conditions, was optimised, its scope assessed and the mechanism investigated.
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Johnson, Stephanie Louise. "Coupled biochemical processes for the synthesis of unusual amino acids." Thesis, Bangor University, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.568798.

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Marloie, Gaël. "Des précurseurs organiques à la chiralité : simulations de processus élémentaires en environnement primitif." Paris 6, 2011. http://www.theses.fr/2011PA066353.

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À l’heure actuelle, il est admis que l’apparition de la vie sur Terre est liée à l’émergence de l’homochiralité des molécules bio-organiques. Le but de cette thèse est d’étudier, dans le cadre de la panspermie, les conditions nécessaires à cette apparition. Cette étude, réalisée au moyen des méthodes de la chimie théorique, est centrée sur trois points clés de la problématique. À ce jour aucune molécule chirale n’a été observée dans le MIS. La recherche de telles molécules constitue donc un point fondamental. En utilisant un critère de sélection basé sur le principe d’énergie minimale, nous avons proposé une série de molécules chirales que nous considérons comme des cibles de choix pour une première observation dans le MIS. Une solution pour l’obtention de milieux homochiraux consisterait à adsorber de manière énantiosélective un mélange racémique sur une surface chirale. Après avoir évalué les limites des modèles que nous proposons d’utiliser pour notre modélisation d’adsorption, nous avons recherché les divers points d’adsorption existant sur la surface. Les résultats obtenus nous ont poussés à étudier la sélectivité de la surface dans sa globalité au moyen d’une approche statistique de l’adsorption. Enfin, on place communément la formation des acides aminés dans les glaces interstellaires. Se pose alors la question de la résistance de la chiralité des acides aminés au rayonnement interstellaire auquel ils sont soumis lors de leur voyage vers la Terre. À travers l’exemple de l’alanine nous évaluons le problème de la racémisation des acides aminés présents dans les glaces cométaires
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La, Barre Anne-Elisabeth de. "Rôle des parties amino-terminales des histones dans le processus d'assemblage des chromosomes mitotiques." Université Joseph Fourier (Grenoble), 2001. http://www.theses.fr/2001GRE10064.

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L'unité de base de la fibre de chromatine est le nucléosome. Il est formé d'un octamère d'histones de coeur H2A, H2B, H3, H4, autour duquel s'enroulent environ 150 pb d'ADN. Les domaines globulaires des histones sont essentiels à la compaction de la chromatine. Les extrémités amino-terminales, quant à elles, sont la cible de nombreuses modifications post-traductionnelles, impliquées dans divers processus cellulaires. La formation des chromosomes mitotiques est un événement cellulaire fondamental qui permet la répartition fidèle et égale du matériel génétique au cours de la mitose et de la méiose. Toutefois la structure et le processus de formation des chromosomes sont encore peu connus. Récemment, il a été montré que l'assemblage des chromosomes mitotiques était associé à la phosphorylation de la sérine 10 de l'histone H3. Mais sa signification fonctionnelle reste inconnue. La première partie de ma thèse a consisté à mettre au point la méthode de formation des chromosomes mitotiques in vitro (de la Barre et al. , Meth. Mol Biol 1999). En incubant des noyaux de sperme dans des extraits mitotiques d'oeufs de xénope, il est possible de suivre la cinétique de formation des chromosomes mitotiques. Cette technique permet également de modifier la composition de l'extrait mitotique pour caractériser les facteurs impliqués dans ce processus. Dans la deuxième partie de ma thèse, nous avons utilisé ce système pour étudier le rôle de chaque extrémité amino-terminale des histones au cours du processus d'assemblage des chromosomes mitotiques (de la Barre et al. , EMBO 2000). Nos résultats nous permettent de discuter le rôle de la phosphorylation de la sérine 10 de l'histone H3 lors de la formation des chromosomes mitotiques. De plus, nous montrons que la partie amino-terminale de l'histone H2B joue un rôle important dans la formation des chromosomes mitotiques : elle pourrait avoir un rôle structural et/ou permettre le recrutement des facteurs d'assemblage des chromosomes mitotiques.
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Riccioli, Riccardo. "Stereodivergent synthesis of β-trifluoromethyl-α- amino acids by sequential catalytic processes". Master's thesis, Alma Mater Studiorum - Università di Bologna, 2018. http://amslaurea.unibo.it/16194/.

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In this work, a sequential organocatalytic process for the stereodivergent synthesis of β-trifluoromethyl-α-amino acids using Erlenmeyer azlactones as starting material is presented. The strategy developed consists of a sequential catalytic approach, employing two catalysts that act independently to control the absolute configuration of two different stereocenters. The first step is a catalytic asymmetric hydrogen transfer of the activated double bond of the azlactone promoted by a Jacobsen type thiourea and Hantzsch ester as hydride donor. The second step involves a nucleophilic addition of an alcohol to the carbonyl moiety controlled by a chiral bifunctional catalyst typically used in the dynamic kinetic resolution of azlactones. The catalyst structure for the second synthetic step was thoroughly investigated in order to maximize the selectivity. Both products were achieved with a good diastereoselectivity and high enantioselectivity. Taking into account the obtained result it was possible to set up an initial study for the feasibility of straightforward one-pot procedure. In conclusion, with this work it was possible to set up a synthetic strategy for the synthesis of all four diastereoisomers starting from the set of starting material.
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Geoghegan, Darren. "Characterisation of amino acid transport processes in Chinese Hamster Ovary (CHO) cells." Thesis, University of Sheffield, 2015. http://etheses.whiterose.ac.uk/12970/.

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Amino acid transport is controlled by a system of transporter proteins whose function remains poorly defined in CHO cells. In this thesis, the relationship between amino acid transporter activity and culture performance parameters was investigated and used as a basis to explore new opportunities for improving cell line productivity. Transcriptomic analysis of transporter expression was first performed in two non-producing CHO cell lines and one antibody-producing CHO cell line during fed-batch cultures. Seven transporters were highly expressed across the three cell lines (ASCT1, CAT-1, GLAST, LAT1, SNAT2, xCT and y+LAT2). For all cell lines, the cystine-glutamate xCT transporter was significantly upregulated at stationary phase and formed part of a larger adaptive response to support the cellular availability of glutathione. The antibodyproducing cell line also upregulated ASCT1 and LAT1 transporter expression during stationary phase, which allowed the cells to maintain a high consumption rate of amino acids abundant in the antibody. Cells were next treated with inhibitors that block amino acid transport through individual or groups of transporters. Inhibition results confirmed that xCT transport activity is a key determinant of culture viability in all cell lines, and along with LAT1, also supports specific productivity during late-stage culture in the antibody-producing cell line. A directed evolution strategy was subsequently developed to increase xCT transport capability in the host. Evolved host cells demonstrated an increased capacity for GSH synthesis, increased resistance to a ROS insult, and a heritable improvement in cell growth but were not able to outperform the unevolved host in the transient production of an IgG. Finally, a mechanistic model to describe essential amino acid transport processes in CHO cells was constructed from transcriptomic and inhibitor data. This model can be used to direct future optimisation of amino acid concentrations in culture media to maximise cell growth and antibody production.
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Ajram, Ghinwa. "Energetic processes driving potential peptide protometabolisms at the origin of living systems." Thesis, Montpellier, 2018. http://www.theses.fr/2018MONTS119/document.

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La thèse aborde différentes questions de chimie prébiotique dans le contexte de l’origine de la vie par une approche de chimie systémique. La première partie est dédiée à l’étude de processus d’activation chimique important non seulement pour la formation de polymères, mais aussi pour alimenter le système en énergie de manière à le maintenir dans un état éloigné de l’équilibre, un prérequis pour l’auto-organisation. Il a été suggéré que les intermédiaires 5(4H)-oxazolones formés par l’activation de l’extrémité C-terminale des peptides pourrait être impliquée dans l’auto-organisation du vivant. Dans ce but, nous avons évalué la réactivité de réactifs pertinents dans un contexte prébiotique et décrits dans la littérature comme capables d’activer des acides α-aminés. Aucun d’entre eux n’a manifesté une activité satisfaisante pour l’activation C-terminale des peptides, montrant qu’une voie possible pour alimenter un protométabolisme des peptides en énergie n’est pas identifiée à ce jour à l’exception notable des N-carboxyanhydrides (NCA) qui peuvent être formé par des voies prébiotiquement plausibles. Nous avons par ailleurs démontré que les carbodiimides sont aussi efficaces pour l’activation des N-carbamoylamino acides que pour celle du carboxyle terminal des peptides en milieu aqueux dilué. La seconde partie du document expose de nouveaux résultats en faveur d’un processus de coévolution peptides-nucléotides. D’abord, une étude de la réactivité d’agents d’aminoacylation de l’extrémité 3’ de l’ARN est présentée. Ensuite, nous évaluons des co-polymères acides α-aminés-nucléotides liés par des enchaînements phosphoramidate et esters comme partenaires éventuels de l’évolution chimique. La pertinence cinétique de ces structures est démontrée ainsi que des voies chimiques permettant leur formation
The thesis addresses several issues in prebiotic chemistry in the context of the origins of life through a systems chemistry approach. The first part is devoted to the study of chemical activation processes that are not only important in the formation of polymers, but also to feed the system with energy in order that a far from equilibrium state is maintained, a prerequisite for self-organization. It has been suggested that 5(4H)-oxazolones intermediates formed by C-terminus peptide activation could be involved in self-organization of life. To this aim, we have checked the reactivity of relevant prebiotic reagents previously proposed to activate α-amino acids. None of them led to a satisfactory C-terminus activation of peptides, showing that no general process for feeding a protometabolism of peptides with energy is identified yet, with the notable exception of N-carboxyanhydrides (NCAs) that can be formed through prebiotically relevant pathways. Additionally, we demonstrated that carbodiimides reagents are as efficient in the activation of N-carbamoyl amino acids as in that of the C-terminus of peptides in diluted aqueous media. The second part of the dissertation discloses new results in support of a process of coevolution of peptides and nucleotides. Firstly, a study of non-enzymatic aminoacylation reagents of the 3’-terminus of RNA is presented. Secondly, we assessed co-polymers of α-amino acids and nucleotides bound by phosphoramidate and ester linkages as potential players in chemical evolution. The kinetic relevance of these structures was demonstrated as well as potential chemical processes that allow their formation
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Books on the topic "Processus aminci"

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Amici curiae and strategic behavior in state supreme courts. Praeger, 2003.

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"Fa ting zhi you" zhi du yu si fa gai ge: The amicus curiae system and the judicatory reform. Fa lü chu ban she, 2006.

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Fitznar, Hans Peter. D-Aminosäuren als Tracer für biogeochemische Prozesse im Fluss-Schelf-Ozean-System der Arktis =: D-amino acids as tracers for biogeochemical processes in the river-shelf-ocean-system of the Arctic. Alfred-Wegener-Institut für Polar- und Meeresforschung, 1999.

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Engin, Ayse Basak, and Atilla Engin. Tryptophan Metabolism: Implications for Biological Processes, Health and Disease. Humana, 2015.

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Engin, Ayse Basak, and Atilla Engin. Tryptophan Metabolism: Implications for Biological Processes, Health and Disease. Humana, 2016.

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Black, Sheila. The original description of central sensitization. Edited by Paul Farquhar-Smith, Pierre Beaulieu, and Sian Jagger. Oxford University Press, 2018. http://dx.doi.org/10.1093/med/9780198834359.003.0040.

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The landmark study discussed in this chapter is ‘The contribution of excitatory amino acids to central sensitization and persistent nociception after formalin-induced tissue injury’, published by Coderre and Melzack in 1992. Previous studies in this field implicate a contribution of excitatory amino acids (EAAs), specifically l-glutamate and l-aspartate, to injury-induced sensitization of nociceptive responses in the dorsal horn of the spinal cord. Repetitive stimulation of primary afferent fibres demonstrated that l-glutamate and NMDA can produce ‘wind-up’ of neuronal dorsal horn activity, and this is blocked by application of NMDA antagonists. This study uses the formalin test as a behavioural model to investigate the mechanisms underlying central sensitization and the role of EAAs, NMDA, their receptors, and their antagonists in this process.
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Taiz, Lincoln, and Lee Taiz. Sex and the Single Cryptogam. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780190490263.003.0017.

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As Chapter 17 makes clear, the asexualist/sexualists controversy continued even as Johann Hedwig and Karl von Nägel demonstrated the existence of sex in cryptogams by discovering the Alternation of Generations (1782, 1784), hybridizers A. F. Wiegman and Carl Friedrich von Gaertner recieved prestigious prizes for their work, and Giovanni Battista Amici and Adolphe-Theodore Brongniart discovered—and confirmed—the pollen tube. Unconvinced, Matthias Jacob Schleiden, co-founder of the cell theory, insisted that ferns grow asexually from spores, and that spores, not seeds, are the primary units of propagation in seed plants also. He argued (1853) that the entire life-cycle of seed plants is based on duplicative cell divisions that produce seeds entirely by vegetative processes. Following the Aristotelian doctrine that the female parent provides the material substance of the embryo, he concluded pollen must be a female structure that reproduces vegetatively—thus making the case for a unisexual, plants-as-female model.
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Crawford, Margo Natalie. The Counter-Literacy of Black Mixed Media. University of Illinois Press, 2018. http://dx.doi.org/10.5406/illinois/9780252041006.003.0004.

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The third chapter brings the mixed media of the BAM and the 21st century together as Crawford shows that black art, after the Black Arts Movement, continues to create an alternative way of approaching art as process, not as object. The first part of this chapter shapes this process-oriented counter-literacy around the Black Arts Movement textual productions of the black book as the open book. She explores the openness of word and image texts and argues that they produce the lack of closure of black post-blackness. Through the text paintings of Glenn Ligon and the word and image books of Amiri Baraka, June Jordan, John Keene, Christopher Stackhouse, and others, this chapter unveils the unbound nature of mixed media as one of the most innovative legacies of the Black Arts Movement.
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Mastroeni, Diego F. An Epigenetics Perspective on Diseases of the Central Nervous System. Oxford University Press, 2016. http://dx.doi.org/10.1093/med/9780190233563.003.0011.

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In the next two decades epigenetics could revolutionize understanding and treatment of diseases of the central nervous system. New research already demonstrates that manipulation of epigenetic mechanisms in vivo and in vitro can ameliorate a host of pathogenic processes associated with neurodegenerative disorders such as Alzheimer’s disease (AD), Parkinson’s (PD), amyotrophic lateral sclerosis (ALS), Huntington’s (HD), and multiple sclerosis (MS), among others. These advances have come relatively rapidly for a field that is still in its infancy compared to the much longer history of epigenetics in developmental biology. Epigenetic modifications are all-encompassing, from nucleotides to amino acids. They are capable of altering transcriptional to biochemical activity in a consistent manner across thousands of genes and hundreds of biologic pathways, yet they can do so differentially even in individuals or cells with identical gene codes. As such, epigenetic modifications are likely to touch on virtually all the mechanisms described in this book.
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Burton, Derek, and Margaret Burton. Excretion. Oxford University Press, 2017. http://dx.doi.org/10.1093/oso/9780198785552.003.0008.

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Excretion is the removal of metabolic wastes such as ammonia, carbon dioxide, ions and water as well as toxic xenobiotics and metals. The process involves the gills, kidney, liver and rectal gland (elasmobranchs and coelacanth). In the liver, amino acids, haemoglobin, steroids and molecules resulting from human activities are transformed to excretable products. The rectal gland excretes ions, notably Na+ and Cl−. The kidney in teleosts has a distinction between an anterior head-kidney containing haematopoietic tissue and endocrine tissue and the posterior region with nephrons (kidney tubules). Fish nephrons generally have a Malphigian corpuscle with a glomerulus but the structure varies between fish taxa and some marine teleosts lack a glomerulus. Control systems for fish excretion are unclear but it is expected that various hormones influence excretory homeostasis.
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Book chapters on the topic "Processus aminci"

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Ikeda, Masato. "Amino Acid Production Processes." In Microbial Production of l-Amino Acids. Springer Berlin Heidelberg, 2002. http://dx.doi.org/10.1007/3-540-45989-8_1.

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Vaccari, Andrea. "High Affinity Binding of p-Tyramine: A Process in Search of a Function." In Trace Amines. Humana Press, 1988. http://dx.doi.org/10.1007/978-1-4612-4602-2_11.

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Li, Ting, Christopher Copeland, and Anne Le. "Glutamine Metabolism in Cancer." In The Heterogeneity of Cancer Metabolism. Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-65768-0_2.

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AbstractMetabolism is a fundamental process for all cellular functions. For decades, there has been growing evidence of a relationship between metabolism and malignant cell proliferation. Unlike normal differentiated cells, cancer cells have reprogrammed metabolism in order to fulfill their energy requirements. These cells display crucial modifications in many metabolic pathways, such as glycolysis and glutaminolysis, which include the tricarboxylic acid (TCA) cycle, the electron transport chain (ETC), and the pentose phosphate pathway (PPP) [1]. Since the discovery of the Warburg effect, it has been shown that the metabolism of cancer cells plays a critical role in cancer survival and growth. More recent research suggests that the involvement of glutamine in cancer metabolism is more significant than previously thought. Glutamine, a nonessential amino acid with both amine and amide functional groups, is the most abundant amino acid circulating in the bloodstream [2]. This chapter discusses the characteristic features of glutamine metabolism in cancers and the therapeutic options to target glutamine metabolism for cancer treatment.
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Matos, Karl, and Elizabeth R. Burkhardt. "Direct Reductive Amination with Amine Boranes." In Pharmaceutical Process Chemistry. Wiley-VCH Verlag GmbH & Co. KGaA, 2010. http://dx.doi.org/10.1002/9783527633678.ch6.

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Ikeda, Masato, Junko Ohnishi, and Satoshi Mitsuhashi. "Genome Breeding of an Amino Acid-Producing Corynebacterium glutamicum Mutant." In Microbial Processes and Products. Humana Press, 2005. http://dx.doi.org/10.1385/1-59259-847-1:179.

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Schröder, K., B. Finke, and A. Ohl. "Improvement of Low-Pressure Microwave Plasma-Assisted Amino Functionalization of Polymers." In Plasma Processes and Polymers. Wiley-VCH Verlag GmbH & Co. KGaA, 2005. http://dx.doi.org/10.1002/3527605584.ch25.

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Knowles, Richard G., Christopher I. Pogson, and Mark Salter. "Application of Control Analysis to the Study of Amino Acid Metabolism." In Control of Metabolic Processes. Springer US, 1990. http://dx.doi.org/10.1007/978-1-4757-9856-2_33.

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Kabbaj, Adil, Karim Bouzouba, Khalid El Hachimi, and Nabil Ourdani. "Ontologies in Amine Platform: Structures and Processes." In Conceptual Structures: Inspiration and Application. Springer Berlin Heidelberg, 2006. http://dx.doi.org/10.1007/11787181_22.

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DeFronzo, Ralph A., and Samuel O. Their. "Renal Tubular Defects in Phosphate and Amino Acid Transport." In Clinical Disorders of Membrane Transport Processes. Springer US, 1987. http://dx.doi.org/10.1007/978-1-4684-1286-4_14.

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Tsuchiya, Kousuke, and Keiji Numata. "Protease-Catalyzed Polymerization of Tripeptide Esters Containing Unnatural Amino Acids: α,α-Disubstituted and N-Alkylated Amino Acids." In Green Polymer Chemistry: New Products, Processes, and Applications. American Chemical Society, 2018. http://dx.doi.org/10.1021/bk-2018-1310.ch007.

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Conference papers on the topic "Processus aminci"

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Lu, Dong, Alastair Trigg, Zhenxiang Xing, Rakesh Kumar, and Chang Kuo Chang. "Application of ToF-SIMS to Airborne Organic Contamination Analysis." In ISTFA 2003. ASM International, 2003. http://dx.doi.org/10.31399/asm.cp.istfa2003p0215.

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Abstract Airborne molecular contamination poses a serious problem for advanced wafer fabrication as the devices are continually scaled down. The amount of this contamination may be only a few monolayers, which are extremely difficult to detect by the commonly used analytical techniques, such as FTIR. ToF-SIMS has extremely high surface sensitivity for the analysis of trace contaminants on wafer surfaces. The high mass resolution of ToF-SIMS is also a powerful tool for the identification of the contaminants. In the current study, ToF-SIMS is used to monitor the build-up of airborne amine contamination on Black Diamond1 surfaces. It has been found that cleaning of the Black Diamond surfaces using wet chemicals can lead to photoresist poisoning. Thermal desorption-GC-MS analysis revealed that wet cleaning would result in the accumulation of hydrocarbons on the Black Diamond surfaces. ToF-SIMS shows that amines can build up gradually on the Black Diamond surfaces after wet cleaning, probably via airborne molecular contamination. For the Black Diamond wafers which did not go through the wet cleaning process, there was no significant increase of amines on the wafer surfaces. The amount of amines on the Black Diamond surfaces depends on the chemicals used in the cleaning processes and the wafer storage conditions. The level of amine contamination can be significantly reduced after the samples are heated up to 300°C for a few minutes in inert atmosphere.
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IKPEZE, Victoria Kamnetochi, John Olusoji OWOLABI, Idowu Iyabo OLATEJU, and Abdulwahab GIWA. "Modelling and Simulation of Acid Gas Absorption from Natural Gas by Amine Solution Using Aspen HYSYS." In SPE Nigeria Annual International Conference and Exhibition. SPE, 2021. http://dx.doi.org/10.2118/207183-ms.

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Abstract This work has been carried out to model and simulate a typical acid gas absorption process using Aspen HYSYS process simulator. The chemical components involved in the process development were water, methane, ethane, propane, higher alkanes, carbon dioxide, hydrogen sulphide, nitrogen and amines: monoethanolamine (MEA), diethanolamine (DEA), triethanolamine (TEA) and methyldiethanolamine (MDEA). The fluid package selected for the simulation before entering the simulation environment was Acid Gas – Chemical Solvents. In the simulation environment, the model was developed by picking an absorber from the Model Palette, placing it and assigning the input and the output streams involved before inputting the parameters required for model convergence. The carbon dioxide-rich feed gas was made to enter the absorber at the bottom inlet stream while the lean amine stream entered at the top inlet and showered down on the uprising gas thereby trapping the carbon dioxide molecules within the gas. The top product from the absorber was the treated gas while the amine solution and the trapped carbon dioxide left the absorber as the bottom product. Different simulations were run to investigate the performance of the amines under the same operating conditions. It was discovered that, of all the four amine solvents considered in this work for the removal of carbon dioxide by chemical absorption, MEA had the highest efficiency but would require more dehydration because it had the highest water content. DEA was also found to scrub the carbon dioxide down to acceptable levels. However, TEA and MDEA barely scrubbed any carbon dioxide under these conditions, as their carbon dioxide compositions were found to be unacceptable. The analyses of the results obtained from the simulations indicated that Aspen HYSYS can be used to study the process of acid gas absorption successfully.
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Nan, Alexandrina, Alexander Bunge, and Rodica Turcu. "Hybride magnetic nanostructure based on amino acids functionalized polypyrrole." In 10TH INTERNATIONAL CONFERENCE PROCESSES IN ISOTOPES AND MOLECULES (PIM 2015). AIP Publishing LLC, 2015. http://dx.doi.org/10.1063/1.4938457.

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Dronca, S., C. Varodi, M. Gligan, et al. "The thermal desorption of CO2 from amine carbamate solutions for the 13C isotope enrichment." In PROCESSES IN ISOTOPES AND MOLECULES (PIM 2011). AIP, 2012. http://dx.doi.org/10.1063/1.3681998.

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Verbouwe, W., M. Van der Auweraer, F. C. De Schryver, R. Pansu, and J. Faure. "Polar excited states in amino-substituted polyphenyls." In The 54th international meeting of physical chemistry: Fast elementary processes in chemical and biological systems. AIP, 1996. http://dx.doi.org/10.1063/1.50156.

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Popović, Ana, Jelena Rusmirović, Maja Đolić, Zlate Veličković, and Aleksandar Marinković. "Lignin Based Porous, Microsphere-Shaped Adsorbent Functionalized with Magnetite Nanoparticles for Effective Chromate Anions Removal." In 34th International Congress on Process Industry. SMEITS, 2021. http://dx.doi.org/10.24094/ptk.021.34.1.133.

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Research goal of this paper represents a novel method of synthesis of an amino-modified, highly effective natural polymer adsorbent kraft lignin based, functionalized with magnetite nanoparticles, for effective removal of chromate anions from water solution. Amino-modified lignin microspheres (LMS-NM) were synthesized via inverse suspension copolymerization of kraft lignin with poly(ethylene imine) grafting-agent and epichlorohydrin cross-linker. The porous structure of the synthesized adsorbent was formed using a 5.0 wt.% sodium-alginate solution. Additional efficiency in the removal of chromium anions from water was achieved by functionalization of lignin microspheres with magnetite (NM) nanoparticles obtained by co-precipitation and additional introduction of amino groups. Structure of formed LMS-NM was confirmed via Furrier Transform Infrared (FTIR) Spectroscopy. Optical microscopy analyses showed the creation of sphere-shaped materials and showed the diameter of prepared LMS-NM in the range of 500 to 800 µm. The removal of chromate anions from water solution was performed in a batch system. The result confirmed high adsorption efficiency and potential application of this nature-based adsorbent for heavy metal anions removal. This work was supported by the Ministry of Education, Science and Technological Development of the Republic of Serbia, as part of the following projects: 451-03-9/2021-14/200325 and 451-03-9/2021-14/200135, with the contribution of the COST Action CA17128.
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Xin, Lianxin, Jie Hou, Aleem Sayles, et al. "Raman spectral analyses of amino acids in life processes." In Optical Diagnostics and Sensing XIX: Toward Point-of-Care Diagnostics, edited by Gerard L. Coté. SPIE, 2019. http://dx.doi.org/10.1117/12.2509883.

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Jung, Jae Chang, Keun-Kyu Kong, Young-Sun Hwang, et al. "Amine gradient process for 157-nm lithography." In SPIE's 27th Annual International Symposium on Microlithography, edited by Theodore H. Fedynyshyn. SPIE, 2002. http://dx.doi.org/10.1117/12.474220.

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Krish, Prem, Andrea Gains-Germain, Joseph Thorp, Jeremy Martin, and Max Shirazi. "Optimizing Amine Process Design Using Liquid Phase Turbochargers." In ASME Turbo Expo 2015: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/gt2015-42774.

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Acid gas removal is a critical process step in natural gas processing and syngas production for ammonia and other uses. Application of a liquid phase turbocharger to the acid gas removal unit (AGRU) results in significant energy savings and improvement to reliability, availability and maintainability (RAM) of the plant. This paper describes conventional configurations with high pressure pumps and new configurations utilizing liquid phase turbochargers. Design of the equipment, process operations and controls and reliability analysis are included. The results of a RAM study comparing conventional configurations to those incorporating liquid phase turbochargers in multiple cases are also presented. From the RAM study, it can be concluded that flow sheet configurations that include a liquid phase turbocharger consistently provide lower plant downtime and maintenance costs as compared with conventional flow sheet configurations. This is in addition to the energy savings that result from energy recovery with the application of the liquid phase turbocharger to the AGRU. For the reference plant used in the study, the maintenance cost savings are as great as $2.5M over the 20 year lifetime of the plant and average annual downtime reduction is as much as 19.8 hours.
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Murugesan, Sankaran, Radhika Suresh, Valery Khabashesku, and Qusai Darugar. "Differentiation and Quantification of Corrosive Amines Through Simple Chemical Process." In SPE International Conference on Oilfield Chemistry. Society of Petroleum Engineers, 2019. http://dx.doi.org/10.2118/193614-ms.

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Reports on the topic "Processus aminci"

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Skone, Timothy J. Natural Gas Sweetening, Amine Process Acid Gas Removal. Office of Scientific and Technical Information (OSTI), 2010. http://dx.doi.org/10.2172/1509097.

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Fisher, Kevin S., Katherine Searcy, Gary T. Rochelle, Sepideh Ziaii, and Craig Schubert. Advanced Amine Solvent Formulations and Process Integration for Near-Term CO2 Capture Success. Office of Scientific and Technical Information (OSTI), 2007. http://dx.doi.org/10.2172/945367.

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Jones, Dale A. Description of the Process Model for the Technoeconomic Evaluation of MEA versus Mixed Amines for Carbon Dioxide Removal from Stack Gas. Office of Scientific and Technical Information (OSTI), 2013. http://dx.doi.org/10.2172/1113403.

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Poole, Loree Joanne, and C. Judson King. Novel Regenerated Solvent Extraction Processes for the Recovery of Carboxylic Acids or Ammonia from Aqueous Solutions Part I. Regeneration of Amine-Carboxylic Acid Extracts. Office of Scientific and Technical Information (OSTI), 1990. http://dx.doi.org/10.2172/937438.

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Dutra, Achilles, Iranildes Santos, Caroline Brigido, and Flavio Lemos. Projeto desenvolvimento de processo eletroquímico para tratamento de efluente do armazém de fertilizantes do porto de Tubarão/ES e de rejeito de minério de ferro (eletro-amido-amina). ITV, 2021. http://dx.doi.org/10.29223/prod.tec.itv.mi.2021.14.dutra.

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