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Kerbrat, Michael. "Physico-chemical interactions of acidic trace gases with ice in snow /". [S.l.] : [s.n.], 2009. http://www.ub.unibe.ch/content/bibliotheken_sammlungen/sondersammlungen/dissen_bestellformular/index_ger.html.
Pełny tekst źródłaBhattacharjee, Arijit. "Physico-chemical investigation on molecular interactions occurring in various liquid systems". Thesis, University of North Bengal, 2010. http://hdl.handle.net/123456789/1319.
Pełny tekst źródłaPulido, Companys Alba. "Physico-chemical phenomena in soft monolayers: chiral recognition, microfluidics and protein interactions". Doctoral thesis, Universitat de Barcelona, 2014. http://hdl.handle.net/10803/275954.
Pełny tekst źródłaEn aquesta tesi s’han estudiat diferents fenòmens físico-químics en l’àmbit de les monocapes de Langmuir. En una primera secció, s’han caracteritzat monocapes de Langmuir d’un derivat d’azobenzè que presenta una separació de fases entre els seus dos possibles isòmers. S’ha explorat la inducció de quiralitat en dominis condensats aïllats, rics en isòmer trans, mitjançant l’acció d’una força quiral química (un dopant quiral), i una de física (un vòrtex). Els resultats obtinguts s’han comparat amb els d’un altre estudi realitzat prèviament en el grup, fet amb un derivat d’azobenzè homòleg. A part, s’ha estudiat un fenomen de reconeixement quiral en monocapes, degut a la interacció de dos enantiòmers quirals d’un altre derivat azobenzènic. Una segona secció de la tesi es centra en el camp de la microfluídica bidimensional, i mostra l’estudi de diferents fenòmens de transport que ocorren en la interfase entre dues monocapes que flueixen al llarg d’un canal. En concret, s’han fet experiments de difusió entre monocapes que co-flueixen per un canal, per tal de trobar les condicions en les que s’obté un increment de la difusió, traduït en un augment del valor del coeficient de difusió mesurat. D’aquesta manera, els experiments realitzats en circuits amb forma de serpentí, o en els que s’hi ha creat vòrtexs, presenten un augment en la difusió. En canvi, l’efecte de l’augment del gradient de concentració existent entre les dues monocapes no ha resultat en canvis apreciables en els coeficients de difusió mesurats. D’altra banda, s’ha visualitzat un procés de dissolució en dues dimensions que segueix el model de dissolució clàssic, i s’han fet experiments per tal d’aconseguir visualitzar una reacció en la línia de contacte entre dues monocapes. A més, s’ha estudiat la formació d’un flux de retorn en la subfase com a resultat del flux d’una monocapa en la interfase, i s’ha pogut relacionar amb perfils de velocitat interficials anòmals obtinguts. En l’última secció, s’han adaptat els protocols experimentals utilitzats en la microfluídica bidimensional, per tal d’estudiar la inserció i difusió d’una proteïna en una monocapa de fosfolípids.
Wessman, Per. "Physico-Chemical Investigations of, and Characterization of Model Membranes for, Lipid-Peptide Interactions". Doctoral thesis, Uppsala : Acta Universitatis Upsaliensis, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-89432.
Pełny tekst źródłaPradhan, Rajendra. "Molecular interactions in mixtures of some industrially important solvents: a physico-chemical study". Thesis, University of North Bengal, 2018. http://ir.nbu.ac.in/handle/123456789/2698.
Pełny tekst źródłaSeptien, Rojas Jose M. "Physico-chemical interactions between silica, salts, water and organohydroxy compounds in clear gel toothpaste formulations". Thesis, Manchester Metropolitan University, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.325423.
Pełny tekst źródłaMansour, Karam Abdelaal <1988>. "Ocean-Atmosphere Interactions: Linking Oceanic Biological Activity to Marine Aerosol Physico-Chemical and Cloud Properties". Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2021. http://amsdottorato.unibo.it/9548/1/PhD_Thesis_UNIBO_Karam_Mansour.pdf.
Pełny tekst źródłaAdhikari, Ratan. "Studies on the physico-chemical characteristics of selected oxazine dyes and their interactions with surfactants". Thesis, University of North Bengal, 2004. http://hdl.handle.net/123456789/829.
Pełny tekst źródłaAhmed, Shansuzzaman. "Studies on physico-chemical characteristics of selected cationic dyes and their interactions with smectite and zeolite". Thesis, University of North Bengal, 1996. http://hdl.handle.net/123456789/769.
Pełny tekst źródłaMishra, Dipu Kumar. "Some novel transition metal complexes of polydentate ligands: synthesis, physico-chemical characterization and DNA Interaction study". Thesis, University of North Bengal, 2021. http://ir.nbu.ac.in/handle/123456789/4759.
Pełny tekst źródłaJoly, Muriel. "Interactions microorganismes-nuage : activité glaçogène et survie". Thesis, Clermont-Ferrand 2, 2013. http://www.theses.fr/2013CLF22424/document.
Pełny tekst źródłaAirborne microorganisms have long been considered as inert, passive particles dealing with hostile conditions. Recent studies highlighting metabolic activity in cloud water raised questions about the role these organisms may play on physical and chemical processes in clouds. Indeed, cloud droplets and ice crystals formation at temperature warmer than -36°C need the presence of particles called “cloud condensation nuclei” or “ice nuclei”. Bacteria could be one of them. In addition, several works revealed a potential importance of microorganisms in organic matter transformation in clouds. The objective of this thesis was to study the reciprocal interactions between microorganisms and physico-chemical conditions in clouds. First, cloud physico-chemical and microbiological compositions were described by cloud sampling at the puy de Dôme station (1465 m, France) and statistical analyses were performed to highlight correlations between physico-chemical and/or biological parameters. Secondly, five microbial strains belonging to genera frequently isolated from cloud water were subjected to four atmospheric stresses: sunlight, hydrogen peroxide, osmotic shocks occurring when water droplets condensate or evaporate and freeze-thaw cycles. Thus, it was pointed that sunlight and hydrogen peroxide at cloud concentration have no or little impact on cell viability. On the opposite, osmotic shocks and freeze-thaw can be highly deleterious depending on the considered strain. The third part of this thesis focused on the detection of ice nucleating bacterial strains in cloud water. Seven strains were thus identified and described, and one of them was selected as a model to study its behavior (survival and ice nucleation activity, INA) in a cloud simulation chamber (AIDA, Germany). In parallel, biological ice nucleation activity was measured directly on cloud samples and bacterial INA was estimated. All these experiments highlighted underestimations of ice nucleation active bacteria in models simulating microphysical processes in clouds. This new dataset may be used as new parameterization in this kind of models. Finally, in order to estimate the bacterial contribution in cloud chemistry, numerical means are needed. Therefore, the last study of this thesis focused on the determination of biological kinetic constants that may be implemented in atmospheric chemistry models. The biodegradation of three major organic compounds encountered in cloud water by three bacterial strains isolated from clouds was measured. A first approach confirmed precedent team results highlighting a considerable contribution of microorganisms on the transformation of these compounds
Gurung, Bhoj Bahadur. "Physico-chemical studies on the solute-solvent interactions of some electrolytes in various single and binary solvent media". Thesis, University of North Bengal, 2006. http://hdl.handle.net/123456789/747.
Pełny tekst źródłaSarkar, Lovely. "Physico-chemical studies on various interactions in some industrial solvent systems and viscous synergy and antagonism prevailing in liquid mixtures". Thesis, University of North Bengal, 2010. http://hdl.handle.net/123456789/1418.
Pełny tekst źródłaDaher, Suzanne. "Optimisation de la formulation d'un béton de chanvre : effet des interactions physico-chimiques entre les particules végétales et le liant". Electronic Thesis or Diss., Amiens, 2022. http://www.theses.fr/2022AMIE0041.
Pełny tekst źródłaHemp concrete is one of the most popular bio-based building materials in France. It is often used as a filling and / or insulation material, in an eco-construction system. Given its high porosity, this concrete has particularly advantageous thermal and hygric performance. However, the lighter this hemp concrete, the higher its level of thermal insulation, while its mechanical properties decrease. This is why it is necessary to optimize its formulation, in order to obtain the best compromise between its mechanical, hygric and thermal performance, depending on the field of use (carrier and / or insulator). The first optimization approach considered consists in varying the rate of plant aggregates in the composition of the concrete, but also the nature and quantity of binder used. The objective of this thesis is to study the mechanical, thermal and hygric properties of a hemp concrete according to its formulation. In this thesis, we are interested in the feasibility of lightweight building materials based on hemp particles and a lime-based binder, which present good mechanical performances. The main objective is to overcome the migration process of free Ca2+ to the lumen of hemp particles that are responsible for their degradation and which, consequently, induce the loss of mechanical performance of the final composite material. To achieve this, a fraction of the base binder is replaced by metakaolin. First, we studied the influence of different percentages of metakaolin on the carbonation of two lime-based control mortars: NHL5 lime and Tradical PF70 pre-formulated lime. Then, we measured their mechanical resistances in compression and flexion in order to define an optimal formulation. Thus, the finished composite materials are tested for different volume percentages (2v and 3v) of hemp particles. The results of the characterization of the physico-mechanical properties of the specimens are presented and argued. A close relationship between the metakaolin content and the physico-mechanical properties of the hemp concrete has been observed, due to the additional hydration products derived from pozzolanic reaction mechanism. The MEB and EDX analyses have shown the enhancement of hemp particles-binder Interfacial Zone Transition, while the pozzolanic reaction leads to reduce the migration process of free Ca2+ to lumen of vegetable particles thus reducing their mineralization. Then, we compared the hygro-thermal performances of hemp concretes formulated with respectively 2 volumes and 3 volumes of plant particles for one volume of binder, without or with 20% metakaolin, the optimal percentage defined previously. This study is particularly useful to establish the adequate proportions of admixtures to be used in concretes intended for renovation works or new constructions. Generally speaking, and depending on the formulation, we obtain a material that is a good or even excellent regulator of ambient humidity, with interesting thermal performances for the insulation of buildings. This characterization work completes the many works already carried out on biobased concrete with different types of plants, and should make it possible to feed the databases essential for the simulation of the behavior of a wall or of the envelope of a building under different climates and guarantee the comfort of the occupants
Porkert, Sebastian. "Physico-Chemical Processes during Reactive Paper Sizing with Alkenyl Succinic Anhydride (ASA)". Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2017. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-219620.
Pełny tekst źródłaDiarrassouba, Fatoumata. "Interactions between ß-lactoglobulin and nutraceutical ligands riboflavin, vitamin D3 and lysozyme Formation, physico-chemical and biological characterization of functional delivery scaffolds". Thesis, Université Laval, 2013. http://www.theses.ulaval.ca/2013/30500/30500.pdf.
Pełny tekst źródłaThe major whey protein, β-lactoglobulin (βlg) is well recognized for its interesting structural properties and ability to interact with ligands with varying size and characteristics. Riboflavin (RF) and vitamin D3 (D3) were selected as small amphiphilic and hydrophobic nutraceutical models, respectively, and Lysozyme, as a larger size ligand model. Spectroscopic methods were used to demonstrate interaction between βlg and RF. βlg and RF form a complex, which was irradiated according to the NCI/NIH Developmental Therapeutics Program. The βlg-RF complex exhibited an important anti-proliferative activity against skin melanoma cancer cell lines, probably due to the generation of reactive oxygen species as the result of the interaction between RF and βlg. The impact of the βlg-D3 complex on the solubility and stability of the D3 was studied using spectroscopic methods and chromatography. The findings indicate that the βlg-D3 complex is stable at the gastric and intestinal pHs and increases the solubility of the vitamin. A βlg-based scaffold, named coagulum, enriched with D3 (94.5 ± 1.8 % of encapsulation efficiency) was prepared by using the capacity of βlg to self-aggregate. Electronic microscopy images showed that microspheres, with high D3 encapsulation efficiency (90.8 ± 4.8 %), were formed as the result of electrostatic interactions between βlg and Lyso. The efficiency of βlg-based scaffolds to improve the solubility, stability and bioavailability of the D3 was evaluated by performing in vitro and in vivo experiments using animal model. The βlg-based scaffolds significantly increased the solubility, stability bioavailability of D3 (p < 0.001). Overall, the present study showed that βlg, due to its structural properties, can be used to form protein-based matrices compatible with a food and an oral administration while preserving the biological activity of RF, D3 and possibly other bioactive molecules.
Diarrassouba, Fatoumata. "Interactions between ß-lactoglobulin and nutraceutical ligands riboflavin, vitamin D₃ and lysozyme : formation, physico-chemical and biological characterization of functional delivery scaffolds". Doctoral thesis, Université Laval, 2013. http://hdl.handle.net/20.500.11794/22672.
Pełny tekst źródłaThe major whey protein, β-lactoglobulin (βlg) is well recognized for its interesting structural properties and ability to interact with ligands with varying size and characteristics. Riboflavin (RF) and vitamin D3 (D3) were selected as small amphiphilic and hydrophobic nutraceutical models, respectively, and Lysozyme, as a larger size ligand model. Spectroscopic methods were used to demonstrate interaction between βlg and RF. βlg and RF form a complex, which was irradiated according to the NCI/NIH Developmental Therapeutics Program. The βlg-RF complex exhibited an important anti-proliferative activity against skin melanoma cancer cell lines, probably due to the generation of reactive oxygen species as the result of the interaction between RF and βlg. The impact of the βlg-D3 complex on the solubility and stability of the D3 was studied using spectroscopic methods and chromatography. The findings indicate that the βlg-D3 complex is stable at the gastric and intestinal pHs and increases the solubility of the vitamin. A βlg-based scaffold, named coagulum, enriched with D3 (94.5 ± 1.8 % of encapsulation efficiency) was prepared by using the capacity of βlg to self-aggregate. Electronic microscopy images showed that microspheres, with high D3 encapsulation efficiency (90.8 ± 4.8 %), were formed as the result of electrostatic interactions between βlg and Lyso. The efficiency of βlg-based scaffolds to improve the solubility, stability and bioavailability of the D3 was evaluated by performing in vitro and in vivo experiments using animal model. The βlg-based scaffolds significantly increased the solubility, stability bioavailability of D3 (p < 0.001). Overall, the present study showed that βlg, due to its structural properties, can be used to form protein-based matrices compatible with a food and an oral administration while preserving the biological activity of RF, D3 and possibly other bioactive molecules.
Choudhury, Ankan. "Physico-chemical investigation of solute-solute, solute-solvent and solvent-solvent interactions of some compounds in non-aqueous and mixed solvent media". Thesis, Th 541.34:C552p, 2005. http://hdl.handle.net/123456789/704.
Pełny tekst źródłaDakua, Vikas Kumar. "Physico-chemical studies on interactions between ion-solvent, ion-ion and solvent-solvent in aqueous and non-aqueous pure and mixed solvent systems". Thesis, University of North Bengal, 2008. http://hdl.handle.net/123456789/707.
Pełny tekst źródłaSinha, Biswajit. "Physico-chemical investigation on various interactions in 1,4-dioxane and its binary systems and viscous antagonism and synergism prevailing in some solvent media". Thesis, University of North Bengal, 2007. http://hdl.handle.net/123456789/706.
Pełny tekst źródłaNandi, Debasis. "Physico - chemical investigations on the ion-solvent interactions of Tetraalkylammonium and alkali metal halides in non-aqueous solvents and their aqueous binary mixtures". Thesis, University of North Bengal, 1989. http://hdl.handle.net/123456789/718.
Pełny tekst źródłaDas, Bijan. "Physico - chemical investigations on the ion-solvent interactions of some Tetraalkylammonium and common ions in non-aqueous and mixed binary aqueous solvent systems". Thesis, University of North Bengal, 1992. http://hdl.handle.net/123456789/719.
Pełny tekst źródłaHasan, Mahmoud. "Nanovectorisation de la curcumine sous forme liposomale : interactions biomolécule / membrane, transferts et cytotoxicité dans des systèmes in vitro". Thesis, Université de Lorraine, 2015. http://www.theses.fr/2015LORR0314.
Pełny tekst źródłaCurcumin, a yellow lipid-soluble natural pigment, a hydrophobic polyphenol derived from the rhizome of Curcuma longa, has been identified as the active principle of turmeric. Curcumin has already become a research focus due to its numerous biological and pharmacological benefits such as antioxidant, antitumor, anti-inflammatory, antimicrobial properties and other desirable medical benefits. However, due to its low absorption, the poor bioavailability of curcumin limits its clinical use. The objective of this work has focused on the study of the physicochemical properties of this molecule encapsulated in form of liposome. Different formulations of nanocarriers prepared from polar lipids more or less rich in polyunsaturated fatty acids with variable long chain, derived from vegetable or marine source, have been used to modify liposomes membrane fluidity. These works have allowed to optimize the encapsulation efficiency of the curcumin and to study its bioavailability and cytotoxicity effects on different cell lines (MCF7, embryonic cortical neurons). The results show significant effects when using nanoliposomes formulated with marine lecithin, protected by chitosan as the coating polymer. The physico-chemical analyses of the size by light scattering (Zetasizer, NanoSight), the stability (measurement of the size and the electrophoretic mobility), the structure by transmission electron microscopy and the release of the encapsulated molecule, allowed to better understand the effects of polymer-phospholipid interactions and the release of encapsulated curcumin in drastic environmental conditions of gastric and intestinal digestion. A multiscale characterization is proposed in order to improve the understanding of the various properties of the active agent (curcumin) and the nanovector, as well as the possible interactions occuring between them. The techniques used are Fourier Transform Infrared Spectroscopy (FTIR), X-rays, Rheometer and Transmission Electron Microscopy
Spinelle, Laurent. "Microsystèmes capteurs de gaz sélectifs au dioxyde d'azote associant structures semi-conducteurs et filtres chimiques (indigo ou/et nanomatériaux carbonés) destinés au contrôle de la qualité de l'air". Phd thesis, Université Blaise Pascal - Clermont-Ferrand II, 2012. http://tel.archives-ouvertes.fr/tel-00741969.
Pełny tekst źródłaTrombetta, Thomas. "Initiation des efflorescences phytoplanctoniques en zone côtière : le rôle de la température et des interactions biologiques". Thesis, Montpellier, 2019. http://www.theses.fr/2019MONTG088.
Pełny tekst źródłaIn temperate marine ecosystems, the major part of the annual primary production is generated in spring during rapid phytoplankton biomass accumulation periods, called ‘blooms’, supporting the diversity and the functioning of these ecosystems. Several physical, chemical and biological mechanisms triggering the bloom initiation were evocated for these ecosystems. However, for shallow coastal zones, under the influence of complex environmental forcing factors, mechanisms triggering blooms are not well known. The objective of the present thesis was to identify and classify the forcing factors contributing to the bloom initiation in these zones, especially the role of physical and chemical forcing factors and biological interactions in the microbial network, but also to understand the consequences of the temperature elevation on this functioning in the global warming context.In this frame, a monitoring with a dual approach was carried out in Thau lagoon: a high frequency (15 min) in situ monitoring of hydrological , meteorological and biological parameters; and a weekly monitoring of the abundance of the microbial community (virus, bacteria, phytoplankton, heterotrophic flagellates and ciliates), and its diversity, with a particular look at phytoplankton. These monitoring were carried out from winter to spring in two consecutive years, 2015 and 2016. Besides these monitoring, an in situ mesocosm experiment was carried out during the 2018 spring to simulate the temperature elevation according to the global warming scenario, in the presence and the absence of mesozooplankton. The objective of this experiment was to identify the direct effect of warming and the indirect effect of the zooplankton on the phytoplankton dynamic, the pigment composition and succession, during the pre-bloom, bloom and post-bloom periods. A correlation network analysis between 110 various groups/taxa/species highlighted the major interactions characterizing the microbial interaction network during the bloom and the non-bloom periods and the differences between these two years. During the bloom periods, intraguild phytoplankton competition and mutualism between phytoplankton and heterotrophic bacteria dominated the microbial food web. This suggested an energy transfer based on both bacterial and phytoplanktonic biomass, through the microzooplankton predation. During the non-bloom periods, interaction between ciliates and heterotrophic bacteria (bacterivory) dominated, suggesting an energy transfer mainly based on bacterial biomass. Besides, the high frequency monitoring highlighted the predominant role of the water temperature increase, especially during the early spring, in the initiation of the phytoplankton blooms. The combination between the phytoplankton metabolism stimulated by the temperature increase and the low grazing pressure triggered the phytoplankton biomass accumulation starting the blooms. Furthermore, 2016 year, with the warmer winter recorded in France (Meteofrance), was characterized by a weaker phytoplankton biomass accumulation during the early spring, a dominance of the small phytoplankton at the expanse of diatoms, and a dominance of interactions between small size microorganisms. The mesocosm experiment confirmed the role of the temperature elevation on the bloom amplitude reduction (diminution of 50% of the chlorophyll a concentration) and the promotion of small phytoplankton such as small green algae and dinoflagellates, at the expanse of diatoms. This amplitude and composition modification of phytoplankton blooms was mainly due to the indirect effect of the zooplankton grazing increase under warming. Furthermore, the results underlined that it was microzooplankton which mainly controlled the phytoplankton dynamic and biomass and the mesozooplankton was mainly accomplished the role of the secondary consumer in this system
Huynh, Thi My Dung. "Impact des métaux lourds sur les interactions plante/ ver de terre/ microflore tellurique". Phd thesis, Université Paris-Est, 2009. http://tel.archives-ouvertes.fr/tel-00486649.
Pełny tekst źródłaNazarova, Cherriere Marfa. "Wettability study through x-ray micro-ct pore space imaging in eor applied to lsb recovery process". Thesis, Pau, 2014. http://www.theses.fr/2014PAUU3030/document.
Pełny tekst źródłaThe aim of the thesis is to study rock wettability change effects caused by Low Salinity brine injection as tertiary recovery method. To identify the underlying mechanism or mechanisms of additional oil recovery X-Ray imaging technology was applied. We have also imaged the end-Point saturations of filled by brine and water core samples. Once the primary drainage is realized we carried out two phases imbibitions: with high salinity brine (waterflooding) and with low salinity brine (tertiary recovery mode). The wettability analysis at pore scale permitted to put in evidence the thermal and saline effects playing a decisive role in rock wettability. We have showed wettability changes are not caused by only electrical double layer expansion, however wettability changes was shown. These changes are explained by wettability transition of second order and observed not only for oil droplet on brine, but also for oil deposited on glass substrate. Finally, the pore space wettability needs to be evidenced at sub-Micrometric scale that is new for the petroleum domain
De, almeida Tania. "Impact d’une espèce ingénieure de l’écosystème et son utilisation en restauration écologique : Le cas de Messor barbarus (L.) dans les pelouses méditerranéennes Above- and below-ground effects of an ecosystem engineer ant in Mediterranean dry grasslands Harvester ants as ecological engineers for Mediterranean grassland restoration: impacts on soil and vegetation A trait-based approach to promote ants in restoration ecology". Thesis, Avignon, 2020. http://www.theses.fr/2020AVIG0358.
Pełny tekst źródłaThe main objective of this thesis was double: (i) to assess the impact of an ant species on its ecosystem, in order to (ii) deduce potential applications in the field of ecological restoration.Ants are among the most abundant organisms in terrestrial ecosystems and occupy a wide range of geographical areas. They play key ecological roles in many ecosystems as soil engineers, predators or regulators of plant growth and reproduction. However, the information collected locally is often fragmented and does not provide a complete overview of the impact of a species on its environment.Messor barbarus (L.), known to redistribute seeds and to modify the soil physico-chemical properties, is widespread in South-Western Europe, particularly in Mediterranean grasslands. Therefore, it may play a major role in the composition and structuring of these ecosystems, which are characterised by high biodiversity but whose abundance and surface area have decreased drastically in recent decades.Through a multi-compartment study, we confirmed the hypothesis that M. barbarus is an ecological engineer in Mediterranean grasslands. This species changes this habitat by modifying, as expected, soil physico-chemical properties. These modifications are associated with an increase in both biomass and heterogeneity of plant communities, as well as changes in above- and belowground fauna (abundance, occurrence and structure of communities). Messor barbarus profoundly changes trophic and non-trophic relationships within and between species and their habitat. The heterogeneity created locally by the activity of M. barbarus leads to a diversification of ecological niches within these grasslands.Despite their major role in the functioning of ecosystems, ants are rarely considered in restoration ecology. In our study site, corresponding to a dry grassland rehabilited after an oil leak and a soil transfer, M. barbarus contributed to accelerate the restoration of the soil physico-chemical properties but also of the seed bank in the medium term - seven years after the rehabilitation. These results make this species a good candidate for ecological engineering.In order to generalise the use of ants in restoration ecology, we propose a trait-based methodology for stakeholders. We evaluated the potential of ants in restoration ecology, then listed all the traits known to affect abiotic and biotic compartments and/or relevant to monitor the success of the restoration phase. The proposed methodology provides a first selection of potentially relevant species according to the restoration objectives
Vecchi, Giulia. "Proteomics studies of protein homeostasis and aggregation in ageing and neurodegeneration". Thesis, University of Cambridge, 2018. https://www.repository.cam.ac.uk/handle/1810/273348.
Pełny tekst źródłaSanyal, Pradip Kumar. "Physico-chemical studies on the interaction of selected cationic dyes with aluminosilicates". Thesis, University of North Bengal, 1988. http://hdl.handle.net/123456789/814.
Pełny tekst źródłaLiberto, Teresa. "Physico-chemical study of calcite colloidal suspensions : from macroscopic rheology to microscopic interaction". Thesis, Lyon, 2018. http://www.theses.fr/2018LYSE1140/document.
Pełny tekst źródłaCalcite (calcium carbonate) is an extremely widespread material that can be found naturally in rocks (i.e. marble, limestone) and is employed in many industrial fields such as paper filling, pharmaceutical, art or construction. Understanding the mechanical properties of calcite suspensions is a first step to improve the workability of the paste as well as the final properties of solid mineral materials. Macroscopic characterization of calcite suspensions via rheological measurements are linked to microscopic interactions, via DLVO analysis. Our calcite pastes are weakly attractive systems showing a typical colloidal gel behavior and characterized by an elastic shear modulus and a critical strain. The elastic domain of pure calcite suspensions is characterized for a wide range of volume concentrations. The deformation at the end of linearity exhibits a minimum versus concentration, a major prediction of colloidal gel theory, never verified so far. The interaction forces between particles are tuned by addition of simple ionic species. Rheological measurements are analyzed through DLVO calculations, obtained by chemical speciations and ζ potential measurements on dense suspensions. Addition of calcium hydroxide improves initially the workability of the paste, enhancing the reactivity when in contact with CO2. The role of interaction forces is also evaluated with flow measurements. The addition of sodium hydroxide increases strongly the attraction between particles, inducing shear bands at the macroscopic scale. This correlation is well known for emulsions but never verified so far for colloidal gels
Sergentu, Dumitru-Claudiu. "Géométries, electronic structures, and physico-chemical porperties of astatine species : an application of relativistic quantum mechanics". Thesis, Nantes, 2016. http://www.theses.fr/2016NANT4024/document.
Pełny tekst źródłaTrials to destroy cancer cells with currently synthesized 211 At-based radiotherapeutic agents are not yet fully satisfactorily since they resume to in vivo deastatination. Since this issue is related to the limited knowledge of the basic chemistry of At and its species, fundamental researches combining ultra-trace experiments and computational studies have been initiated. In this thesis, a computational study of several At species is performed, by means of relativistic density functional theory and wave-function-based calculations. First, the quantum mechanical approaches that can safely be used to make adequate predictions are established. Using these approaches, we attempt to rationalize the electronic structures, geometries, and physico-chemical properties of various systems of theoretical and/or experimental interest, in particular the AtF3 and AtO+ ones. By the end, we firmly identify a new At species by combining outcomes of experiments and calculations. This new species not only completes the Pourbaix diagram of At in aqueous and non-complexing media, but also gives clues of identifying experimental conditions to make best reactive the At– precursor, which is currently involved in the synthesis of promising radiotherapeutic agents
Al-Awad, Musaed Naser J. "Physico-chemical analysis of shale-drilling fluid interaction and its application in borehole stability studies". Thesis, Heriot-Watt University, 1994. http://hdl.handle.net/10399/1368.
Pełny tekst źródłaPal, Subrata. "Studies on physico - chemical characteristics of progressively alkylated thiazine dyes and their interaction with montmorillonite". Thesis, University of North Bengal, 1992. http://hdl.handle.net/123456789/715.
Pełny tekst źródłaRavarian, Roya. "The Effect of Nano-Scale Interaction on the Physico-Chemical Properties of Polymer-Bioactive Glass Composites". Thesis, The University of Sydney, 2013. http://hdl.handle.net/2123/10147.
Pełny tekst źródłaPagano, Bruno. "Physico-chemical characterization of DNA G-quadruplexes and their interaction with proteins and potential anticancer agents". Doctoral thesis, Universita degli studi di Salerno, 2011. http://hdl.handle.net/10556/163.
Pełny tekst źródłaNegli ultimi anni è stato dimostrato che sequenze di DNA (o RNA) ricche in guanine sono in grado di formare una nuova classe di strutture: le quadruple eliche. Importante e' la presenza di quadruple eliche in regioni promotrici e regolatrici di molti geni e nella parte terminale dei cromosomi, i telomeri. Recentemente, lo studio di queste molecole ha avuto un notevole sviluppo grazie alle diverse applicazioni che esse potrebbero avere in campo medico e farmaceutico. In particolare, le quadruple eliche hanno una potenziale applicazione nella terapia anticancro quali inibitori della telomerasi, un enzima la cui iperattività è sicuramente collegata allo sviluppo del cancro. Un promettente approccio per inibire l’attività della telomerasi riguarda l’utilizzo di agenti che possano legare e stabilizzare le quadruple eliche presenti ai telomeri bloccando, in tal modo, l’attività catalitica dalla telomerasi ed agendo da antitumorali. Inoltre, è stato scoperto che oligonucleotidi con struttura a quadrupla elica possono agire da aptameri, cioè hanno la capacità di legare specificamente delle proteine bersaglio, inibendole. L’aptamero denominato TBA (Thrombin Binding Aptamer) è un oligomero a DNA con struttura a quadrupla elica, scoperto in vitro, che è in grado di legare la trombina inibendone la funzione. Il TBA per le sue proprietà anticoagulanti è stato oggetto di numerosi studi sia di tipo strutturale sia di natura farmacologica. L’attività anticoagulante del TBA in vitro è tale da giustificare un suo eventuale impiego in terapia, ma purtroppo tale attività risulta piuttosto bassa in vivo poichè il DNA è rapidamente degradato dalle nucleasi. Uno degli obiettivi di questa tesi di dottorato è stato quello di affrontare uno studio chimico-fisico di composti che sono in grado di legarsi in maniera specifica alle quadruple eliche e dei fattori che regolano gli equilibri in gioco; tali composti sono, infatti, in grado di incrementare la stabilità di questi sistemi e di conseguenza ne possono aumentare l’effetto terapeutico. Per questo motivo è stata studiata la termodinamica dell’interazione di alcune molecole di interesse farmacologico, quali la distamicina, due suoi derivati e la porfirina cationica, con diverse quadruple eliche. Le quadruple eliche prese in esame sono state la d[AG3(TTAG3)3] e la [d(TAGGGTTAGGG)]2 che rappresentano due quadruple eliche formate da un diverso troncamento dal DNA telomerico umano e la d[(TGGGGT)]4 formata da una sequenza troncata del DNA telomerico di Oxytricha e Tetrahymena. Un altro obiettivo è stato quello di caratterizzare la stabilità termodinamica del TBA e di un aptamero modificato (mTBA) ed il processo di binding di questi aptameri con la trombina. L’mTBA presenta una modifica chimica in grado di rendere resistente l’aptamero all’azione delle nucleasi che potrebbe rendere concreto un suo eventuale utilizzo come principio attivo di un farmaco anticoagulante. Inoltre, è stato anche affrontato uno studio computazionale di due quadruple eliche bimolecolari formate da sequenze analoghe di RNA e DNA allo scopo di chiarire i motivi per cui si formano due diverse strutture a quadrupla elica ed i fattori che le stabilizzano. Lo studio è stata condotto principalmente attraverso tecniche calorimetriche quali la calorimetria isoterma (ITC), la microcalorimetria differenziale a scansione (DSC), il dicroismo circolare (CD), e metodi computazionali quali meccanica e dinamica molecolare e docking. I risultati ottenuti per i sistemi quadrupla elica-ligando dimostrano che la distamicina ed un suo derivato contenente un anello metil pirrolico in più ed un gruppo ammidico terminale, legano le quadruple eliche in esame, al contrario un secondo derivato della distamicina contenente due anelli metil pirrolici in più ed un gruppo ammidico terminale non ha mostrato avere interazioni specifiche. I parametri termodinamici ottenuti indicano che le interazioni quadrupla elica-ligando sono fortemente influenzate dallo ione presente in soluzione e che anche la stechiometria di legame è dipendente dal tipo di soluzione. Il calcolo dei parametri termodinamici ha mostrato che, sia in sodio che in potassio, il legame della distamicina e del composto I alle quadruple eliche in esame è entropicamente guidato. Questo dato in particolare suggerisce che il binding di queste molecole potrebbe avvenire nei solchi delle quadruple eliche. Inoltre, un risultato particolarmente interessante è che il composto I ha mostrato, in entrambe le soluzioni, una maggiore affinità della distamicina per le quadruple eliche. I risultati ottenuti per l’interazione porfirina-[d(TAGGGTTAGGG)]2 sono in generale accordo con la struttura cristallografica, recentemente riportata, del complesso ed indicano un binding entalpicamente guidato con una stechiometria 2:1. Lo studio della stabilità termodinamica del TBA e del TBA modificato ha rivelato che l’introduzione della modifica aumenta sia la stabilità termica che termodinamica dell’aptamero. Inoltre, i valori delle variazioni di entalpia ed entropia per la dissociazione del TBA modificato risultano più elevati rispetto al TBA, suggerendo una struttura più rigida e la presenza di ulteriori interazioni intramolecolari nell’aptamero modificato. Questi risultati sono stati confermati ed interpretati sulla base dei risultati delle dinamiche molecolari dei due aptameri. I parametri termodinamici del processo di binding del TBA e del TBA modificato con la trombina mostrano che l’interazione è esotermica e che la stechiometria del complesso che si forma è 1:2 (aptamero:proteina). Il TBA modificato risulta però avere una più alta affinità per la trombina e la sua interazione è associata ad una variazione di entalpia maggiormente favorevole. I risultati delle dinamiche molecolari dei complessi suggeriscono che la maggior affinità dell’aptamero modificato sia dovuta essenzialmente ad una migliore interazione con l’esosito II della trombina. Lo studio di dinamica molecolare delle quadruple eliche di RNA e DNA ha evidenziato che la maggiore differenza tra le due molecole deriva dalla presenza del gruppo 2’-OH del ribosio, che contribuisce considerevolmente al numero di legami idrogeno formando più interazioni intramolecolari nella molecola di RNA. I legami che hanno una maggiore persistenza sono quelli formati con l’ossigeno del gruppo fosfato. Questo tipo di legame idrogeno conferisce rigidità alla struttura ed è in parte responsabile della stabilità delle esadi presenti nella quadrupla elica di RNA. Inoltre, durante le simulazioni, gli ioni Na+, inizialmente non direttamente coordinati alle quadruple eliche, vanno a coordinare in modo stabile le macromolecole indicando un possibile meccanismo di coordinazione non ancora osservato sperimentalmente. Parte della ricerca è stata svolta in collaborazione con la Prof. Concetta Giancola del Dipartimento di Chimica dell’Università Federico II di Napoli. Inoltre, una parte dello studio è stato realizzato a Londra presso i laboratori del Prof. Stephen Neidle della School of Pharmacy dell’University of London, e presso il gruppo della Dott. Franca Fraternali, della Randall Division del King’s College London. [a cura dell'autore]
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Chaudhury, Rajat Narayan. "Physico-chemical studies on the interaction of bivalent metal cations with natural and snthetic humic substances". Thesis, Physico-chemical studies on the interaction of bivalent metal cations with natural and snthetic humic substances, 1985. http://hdl.handle.net/123456789/1034.
Pełny tekst źródłaBanik, Ishani. "Physico-Chemical studies on interaction of biologically active solutes and ionic salts in some industrially important solvent media". Thesis, University of North Bengal, 2014. http://ir.nbu.ac.in/handle/123456789/1491.
Pełny tekst źródłaSaillio, Mickaël, i Mickaël Saillio. "Interactions physico-chimiques ions-matrice dans les bétons sains ou carbonatés : influence sur le transport ionique". Phd thesis, Université Paris-Est, 2012. http://tel.archives-ouvertes.fr/tel-00777946.
Pełny tekst źródłaTishkova, Victoria. "Nanoparticules de combustion émises par différents moyens de transport : caractérisation physico-chimique et hygroscopicité". Aix-Marseille 2, 2009. http://theses.univ-amu.fr.lama.univ-amu.fr/2009AIX22060.pdf.
Pełny tekst źródłaTransport emission of nanoparticles into atmosphere is of major interest because of its possible effect on climate changes. The understanding of the potential environmental effect of the aviation and ship emission is still poor maintly because of the lack in the experimental characterization of these nanoparticules. The present work focuses on physico-chemical properties of combustion nanoparticles and their interaction with water. Hygroscopicity is on of the key parameters that are related to could condensation nuclei (CCN) activity and the environnemental effect. Experimental data show differences in the microstructure, elemental composition residuals coming from marine transport emitted residuals. Water uptake on combustion residuals coming from marine transport and aviation is higher than for laboratory-produced samples. We can therfore guess that these particules act as active CCN in the atmosphere
Sinquin, Anne. "Alginates associatifs : synthèse et étude physico-chimique en milieu aqueux". Vandoeuvre-les-Nancy, INPL, 1995. http://www.theses.fr/1995INPL035N.
Pełny tekst źródłaSong, Xinyu. "Physico-chemical interactions between fibre-based wiping materials and disinfectant affecting antimicrobial efficacy". Doctoral thesis, 2020. http://hdl.handle.net/1822/76196.
Pełny tekst źródłaO uso de toalhetes à base de fibras impregnados com desinfetantes são o método mais comum para a desinfeção de superfícies em contexto hospitalar, indústrias de processamento e aplicações domésticas. Este trabalho estuda a interação entre o desinfetante cloreto de alquildimetilbenzilamónio (ADBAC) e toalhetes comerciais compostos por três materiais distintos, W1 – 100% poliéster, W2 – 55% celulose/45% poliéster e W3 – 100% celulose, a sua eficácia antimicrobiana e o efeito do tratamento com descarga plasmática de barreira dielétrica (DBD). Demonstrou-se que a adsorção de ADBAC é significativamente influenciada pela composição do substrato têxtil em termos de teor de celulose, razão de banho e tempo de imersão. Os substratos com maior teor de celulose apresentam maior adsorção de ADBAC. No entanto, na análise por espectroscopia de raio-X (XPS), o substrato de poliéster foi o que apresentou a maior concentração de ADBAC na superfície. Os resultados de XPS também demonstraram a geração de novas espécies de oxigénio na sua superfície após o tratamento DBD, o que aumentou de forma substancial a concentração de ADBAC. Na celulose, o plasma apenas promoveu um efeito de erosão. No estudo de envelhecimento não se observaram diferenças significativas na força e alongamento à rotura durante o armazenamento de W1 e W2. No entanto, a força à rotura no sentido da trama do substrato W3 tratado com plasma diminuiu. Os resultados das análises mecânicas dinâmicas demonstraram que a imersão em ADBAC e o tratamento DBD tiveram uma influência significativa nas propriedades viscoelásticas de W1, pelo melhoramento da resposta elástica devido à diminuição da mobilidade das cadeias poliméricas, e de W3, pelo melhoramento da resposta não elástica devido à erosão plasmática. O substrato W1 foi o que demonstrou maior eficácia antimicrobiana, sendo este efeito mais evidenciado e mantido ao longo do tempo nas amostras tratadas com plasma. Por outro lado, o W2 não tratado com plasma exibiu maior efeito antimicrobiano em bactérias Gram-positivas, mas com o tratamento DBD, a atividade antimicrobiana foi maior nas Gram-negativas. O substrato W3 apresenta baixa atividade antimicrobiana, confirmando os resultados apresentados na literatura para a celulose. Em geral, este projeto permitiu o desenvolvimento de uma nova classe de toalhetes à base de poliéster de custo acessível e ambientalmente sustentável. Estes possuem uma eficácia antimicrobiana superior, melhorada pelo tratamento DBD, devido à maior concentração de ADBAC na superfície do toalhete, podendo ser armazenados por período de tempo mais longos.
Surface disinfection by disinfectant-impregnated wipes is the most prevalent disinfection method used in nosocomial environment, food processing industry and other domestic situations. This work studies the interaction between the alkyldimethylbenzylammonium chloride (ADBAC) disinfectant and three untreated and dielectric barrier discharge (DBD) plasma-treated commercial wiping materials of W1 – 100% polyester, W2 – 55% cellulose/45% polyester and W3 – 100% cellulose (cotton) affecting the antimicrobial efficacy. Wipe material type in terms of cellulose content, liquor ratio and immersion time demonstrated a significant influence on the adsorption of ADBAC in both untreated and plasma-treated samples. The higher the content of cellulose in the material, the higher is the adsorption of ADBAC active ingredient. Nevertheless, X-ray photoelectron spectroscopy (XPS) analysis found higher ADBAC concentration on the surface of polyester wipe than the other two. Also, it confirmed the interaction of the ADBAC with the newly generated oxygen species on the polyester surface when plasma treatment was applied, drastically increasing the ADBAC concentration on the surface. Whereas, plasma treatment only resulted in etching effects on cellulose. In the ageing study, no significant changes in breaking force and elongation during storage for untreated and plasma-treated W1 and W2 were observed. However, plasma treatment affects W3 in weft direction reducing the force at break. Dynamic mechanical analysis results showed that ADBAC immersion and plasma treatment have a significant influence in viscoelastic properties of W1, by improving its elastic response limiting the polymeric chains mobility and of W3, by enhancing the non-elastic response due to the etching effect. W1 displayed the highest antimicrobial efficacy, with more enhanced and prolonged performance in plasma-treated samples. W2 showed high antimicrobial effect but plasma treatment caused an inversion in its performance against Gram-positive and Gram-negative bacteria. W3 exhibited low antimicrobial activity, confirming the negative result presented in literature. Overall, plasma treatment allows a new class of low-cost and environmental-friendly polyester-based wiping materials with superior antimicrobial efficacy due to improved ADBAC concentration on the wipe surface, which is maintained during a longer storage period.
I am greatly indebted to the Fundação para a Ciência e a Tecnologia for its financial aid of the PhD Project (SDRH/BD/130028/2017), and to the Centro de Ciência e Tecnologia Têxtil (2C2T) – Universidade do Minho for the support of the PhD work with all the available research facilities. I appreciate very much of the organisation European Cooperation in Science & Technology (COST) for its financial support under COST action CA15114 of the ICPIC 2019 conference and STSM in the University Medical Centre of Amsterdam.
Bhattacharyya, Moitrayee. "Probing Ligand Induced Perturbations In Protien Structure Networks : Physico-Chemical Insights From MD Simulations And Graph Theory". Thesis, 2012. https://etd.iisc.ac.in/handle/2005/2341.
Pełny tekst źródłaBhattacharyya, Moitrayee. "Probing Ligand Induced Perturbations In Protien Structure Networks : Physico-Chemical Insights From MD Simulations And Graph Theory". Thesis, 2012. http://etd.iisc.ernet.in/handle/2005/2341.
Pełny tekst źródłaPorkert, Sebastian. "Physico-Chemical Processes during Reactive Paper Sizing with Alkenyl Succinic Anhydride (ASA)". Doctoral thesis, 2016. https://tud.qucosa.de/id/qucosa%3A30179.
Pełny tekst źródła"FLAXSEED (Linum usitatissimum L.) GUM AND ITS DERIVATIVES: PHYSICOCHEMICAL PROPERTIES AND POTENTIAL INTERACTIONS WITH FOOD MACROMOLECULES". Thesis, 2016. http://hdl.handle.net/10388/ETD-2016-04-2513.
Pełny tekst źródłaStellato, Marco Ignazio. "Physico-chemical characterization of model bio-membranes and their interaction with potential therapeutic peptides". Tesi di dottorato, 2016. http://www.fedoa.unina.it/10905/1/Stellato_MarcoIgnazio_28.pdf.
Pełny tekst źródłaCarullo, Paola. "Physico-chemical characterization of the interaction between thyroid transcription factor 1 (TTF-1) and DNA". Tesi di dottorato, 2010. http://www.fedoa.unina.it/8096/1/Carullo_Paola_22.pdf.
Pełny tekst źródłaNgoetjane, Pitsi Christopher. "Interaction of gold mine taillings leachates with soil and geochemical partitioning of toxic metal species". Diss., 2016. http://hdl.handle.net/11602/363.
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