Tesis sobre el tema "Biophysical transition"
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Colledge, Vicki Louise. "Stuructural and biophysical investigations of bacillus subtillis transition-state regulators". Thesis, University of York, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.535053.
Texto completoValba, Olga. "Statistical analysis of networks and biophysical systems of complex architecture". Phd thesis, Université Paris Sud - Paris XI, 2013. http://tel.archives-ouvertes.fr/tel-00919606.
Texto completoNauseef, Jones Trevor. "An investigation of the molecular and biophysical properties of metastatic cells". Diss., University of Iowa, 2015. https://ir.uiowa.edu/etd/3150.
Texto completoLeekumjorn, Sukit. "Molecular Dynamics Simulations for the Study of Biophysical Processes on Biological Membranes". Diss., Virginia Tech, 2008. http://hdl.handle.net/10919/29180.
Texto completoPh. D.
Wang, Yin 1951. "Influences of membrane biophysical properties on the Metarhodopsin I to Metarhodopsin II transition in visual excitation". Diss., The University of Arizona, 1997. http://hdl.handle.net/10150/282520.
Texto completoStam, Carson A. "Using Biophysical Geospatial and Remotely Sensed Data to Classify Ecological Sites and States". DigitalCommons@USU, 2012. https://digitalcommons.usu.edu/etd/1389.
Texto completoDrew, Elliot Dudley. "Biophysical and computational characterisation of the disorder-to-order structural transition of the small hydrophilic endoplasmic-reticulum associated protein, SHERP". Thesis, Birkbeck (University of London), 2018. http://bbktheses.da.ulcc.ac.uk/366/.
Texto completoKettner, Claudia, Angela Köppl y Sigrid Stagl. "List of well-being indicators". European Commission, bmwfw, 2012. http://epub.wu.ac.at/4714/1/WWWforEurope_WPS_no002_MS30.pdf.
Texto completoSeries: WWWforEurope
Kettner, Claudia, Angela Köppl y Sigrid Stagl. "Towards an operational measurement of socio-ecological performance". European Commission, bmwfw, 2014. http://epub.wu.ac.at/4718/1/WWWforEurope_WPS_no052_MS29.pdf.
Texto completoSeries: WWWforEurope
Stelzl, Lukas Sebastian. "Studying marcomolecular transitions by NMR and computer simulations". Thesis, University of Oxford, 2014. http://ora.ox.ac.uk/objects/uuid:6e4bbe06-fc58-471b-a932-d940fe78b9a5.
Texto completoGori, Matteo. "Phase transitions theory and applications to biophysics". Thesis, Aix-Marseille, 2016. http://www.theses.fr/2016AIXM4111.
Texto completoThe studies and results reported in this manuscript are aimed to develop a deeper understanding of the principles at the basis of self-organization in biological system.The Topological Theory of phase transitions is one of the possible approaches to provide a generalization of description of phase transitions in small or mesoscopic systems. This theory has been rigorously rooted in two theorems: a counterexample to one of these theorems has been recently found. The first part of this manuscript is devoted to investigation of the "counterexample" to understand if and how the theory can be saved. In the second part of this manuscript the results of theoretical, numerical and experimental investigations on Fr"ohlich-like condensation for normal modes of biomolecules are reported. This is a prerequisite for the activation of giant dipole oscillations in biomolecules which entail long-range electrodynamic interactions between coresonant molecules. In this thesis is shown that long-range interactions markedly affect the self-diffusion properties of molecules in solution. A fingerprint of long-range interactions could be a "transitional" phenomenon concerning the self-diffusion coefficient as a function of a control parameter proportional to interaction strength. Analogous simulations have been performed to validate an experimental approach aimed at finding such "fingerprint" in systems with built-in long-range interactions
Desnos, Hugo. "Amélioration des procédures de cryoconservation de type congélation-lente par simulation et caractérisation des effets de composés chitooligosaccharides". Thesis, Lyon, 2019. http://www.theses.fr/2019LYSE1048/document.
Texto completoWe wished to move aside classical cryopreservation procedure improvements that are based on empiricism and to focus on existing biophysical models in order to describe procedures. We based our study on two methods. The first method consisted in developing the methods for the simulations of procedures, by characterizing the use of Snomax in a DSC device. This study highlighted that the nucleation temperature (Tn) control is possible under precise experimental conditions (sample volume and Snomax concentration) that influence the presence probability of 3 INA subpopulations of the P. syringae protein aggregates. The possibility to simulate the cryopreservation procedures has been achieved for some supercooling ranges within complex cryopreservation solutions. Consequently, it has been possible to characterize the physical effects influenced by Tn and involved within procedures. These results will participate in supplying cryopreservation biophysical models. The second method aimed to modify the composition of cryopreservative solutions in order to reduce the DMSO use (because of its cytotoxicity), using extracellular CPA components: the chitooligosaccharides COS. Subsequent to the biocompatibility verification of the COS with embryonic cells, the thermodynamic influence of the COS has been characterized. Therefore, it has been demonstrated that COS are cryostabilizers that link themselves to a small number of water molecules and does not influence its physicochemical properties. Consequently, COS can be added within the extracellular space without any risk to accelerate the cell dehydration. It has been demonstrated that COS favor the gelation of the extracellular space and that this gelation relies on the mass proportion of water in the residual solution. This gelation immobilizes a part of the system and therefore favor its stabilization when the temperature reaches the risky recrystallization range
Tjhung, Elsen. "Phenomenology and simulations of active fluids". Thesis, University of Edinburgh, 2013. http://hdl.handle.net/1842/8017.
Texto completoFinnerty, Gerald Thomas. "Factors determining the transition to seizure in the tetanus toxin model of epilepsy". Thesis, Imperial College London, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.361453.
Texto completoAlrabghi, Ghadah. "THE PHYSICAL PROPERTIES OF PHOSPHOLIPID AND TRIGLYCERIDE MONOLAYERS: PHASE TRANSITIONS, MORPHOLOGY AND COLLAPSE". Kent State University / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=kent1436273087.
Texto completoTripathi, Swarnendu. "Conformational Transition Mechanisms of Flexible Proteins". Kent State University / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=kent1281491004.
Texto completoGutierrez, Cori Omar. "Relationship and feedback between LULC changes and hydroclimatic variability in Amazonia". Electronic Thesis or Diss., Sorbonne université, 2024. http://www.theses.fr/2024SORUS123.
Texto completoThe Amazon rainforest plays a vital role by functioning as a regulator of the climate system and as the main terrestrial carbon sink. It drives hydroclimatic processes and mitigates the effects of droughts through vegetation-atmosphere coupling. Indeed, Amazon forests have the potential to impact rainfall patterns through biophysical processes like water recycling. However, these capacities have been reduced during the last decades due to disturbances in the climate-vegetation system together with the intensification of droughts. All this has accentuated a process of biophysical transition from a predominantly forested ecosystem to a Savanna. Therefore, given these complexities, understanding the direction of changes is of vital importance.Using multiple datasets and the coupled ORCHIDEE and LMDZ models, this thesis delves into the study of the interactions between Amazon hydroclimatology and vegetation. In addition, it seeks to expand our understanding of modifications in the vegetation-atmosphere system and its links with climate and LULC changes. Likewise, taking into account the increasing rates of deforestation, it investigates the effects and feedback resulting from a large-scale forest loss scenario on hydrological processes.The results show that, over the southwestern Amazon, forests undergo a transition from being influenced by energy availability to depending on water availability throughout the year. During the rainy season, vegetation growth is primarily influenced by energy availability rather than water availability. Nevertheless, outside of this period, forests respond positively to precipitation and terrestrial water storage, suggesting that vegetation is primarily dependent on water supply. However, a spatial analysis reveals that recent deforestation modifies these transitions and destabilizes the natural balance in the climate-vegetation system.The nature of these imbalances in the Amazon is not entirely clarified. Through an approach based on the relationships of water/energy fluxes and vegetation conditions over the last four decades, it is explored whether these changes are intrinsic to climate variability or are driven by anthropogenic processes. 67% of the southwestern Amazon has experienced a transition towards a predominantly dry state due to climatic factors (external forcing), while 21% has transitioned towards a state dominated by deforestation (internal forcing). However, external and internal forcings are not independent processes, as both mechanisms drive changes simultaneously. By weighing the magnitudes of these forcings, we show that the synergies have led 74% of the southwestern Amazon toward a state of greater water stress. Nevertheless, during recent years, although combined external-internal processes continue to exert significant control over changes, 30% of these are strictly dominated by internal forcing. This suggests that internal processes are playing an increasingly relevant role in the transition towards a state characterized by high forest water stress, especially in areas where deforestation and anthropogenic pressure are increasing.Using the coupled ORCHIDEE and LMDZ models, the effects of projected Amazon deforestation by 2050 on the hydrological cycle and dryness are examined. Deforestation decreases precipitation, reduces evapotranspiration and increases runoff. Furthermore, deforestation accentuates water stress especially in the southwestern Amazon (positive feedback). Water demands in the atmosphere, on the land surface and even in the soil root zone intensify during the dry season. During the wet season, the deficit of specific atmospheric humidity becomes even more acute towards the tropical Andes over the Altiplano region. These findings provide a more thorough understanding of the possible effects of massive forest removal on the water availability and resilience of the Amazon in a context where changes are occurring at an accelerated rate
Laarraj, Mohcine. "Nanocalorimètre dynamique pseudo-différentiel à haute sensibilité pour l'étude thermodynamique et cinétique de la transition vitreuse". Thesis, Université Grenoble Alpes (ComUE), 2016. http://www.theses.fr/2016GREAY029/document.
Texto completoThis thesis reports the working principle and the building up of a dynamic differential nanocalorimeter to the study of the glass transition. The micro-fabricated sensor, the low noise and highly stable measurement chain, as well as the thermal environment of the sensor are described in details. The measurement method is a spectroscopic method in which the amplitude and phase of the oscillating temperature are measured with a high resolution at different frequencies. The resolution of the nanocalorimeter on the measurement of the complex heat capacity module is ∆|C_p^* |/|C_p^* | ± 0,001 %, and on the phase of the temperature oscillation is ∆φ/φ ± 0, 0005 %. This resolution is about one thousand times higher than that of the commercial temperature modulated calorimeters. The potentialities of the nanocalorimeter for the study of fine thermodynamic and kinetic effects are demonstrated on a model of glassy polymer, the poly(vinyl acetate). New effects which are too fine to be detected by conventional calorimeters have been measured. The modulus of the complex heat capacity and the phase of the temperature oscillation exhibit small relaxational effects of low amplitude either in the super-cooled liquid state or in the glassy state. In addition, according to the thermal history followed by the material, the structural recovery of this polymer can take place in two steps during the heating. These two steps are visible only on the temperature derivative of the modulus of the complex heat capacity. In conclusion, resolution, stability and repeatability of the nanocalorimeter are particularly suitable for fine thermodynamic and kinetic study on out of equilibrium complex systems such as glasses
Miermont, Agnès. "Severe osmotic compression of the yeast Saccharomyces cerevisiae". Phd thesis, Université Paris-Diderot - Paris VII, 2013. http://tel.archives-ouvertes.fr/tel-00864602.
Texto completoGerbelli, Barbara Bianca. "Propriedades estruturais e elásticas de fases lamelares: O efeito da composição da membrana". Universidade de São Paulo, 2012. http://www.teses.usp.br/teses/disponiveis/43/43134/tde-12032013-102341/.
Texto completoIn this work we present a systematic study of structural properties of a lamelar phase composed of lecithin when a commercial cosurfactant(Simulsol) which is a mixture of etoxylated fatty acids. The study was carried out using small angle X ray scattering with samples encapsulated in glass capillaries, varying membrane composition from 100% of lecithin to 100% of Simulsol, through the dilution line, for each composition. The experimental results were analyzed using a method that fits directly the scattered intensity and, by means of an optimization procedure, gives the electronic density profile of the lipid bilayer. From the analysis of experimental data, in addition to the structural parameters, such as the lamellar period and membrane thickness,we obtain the Caillè parameter, which relates the elastic constants that characterizes the flexibility of the lamellar system. Thermodynamic properties of the lamellar system were also investigated, for two membrane compositions, by controlling the water chemical potential. The combination of results obtained in structural and thermodynamic studies allowed determination of the compressibility modulus of the lamellar phase and the membrane rigidity constant. The incorporation of co-surfactant to the membrane increases the contribution of entropic interactions arising from membrane fluctuations resulting in the stabilization of lamellar phase for larger membrane separation distances than observed for the lamellar system composed of lecithin only. For small membrane separation distances, a superposition of polar region of neighbor bilayers is observed, with related changes in the behavior of Caillè parameter, and consequently in the behavior of compressibility and membrane rigidity constants. In diluted regime, the incorporation of amphiphilic molecules with a single carbonic chain results in a significant reduction in lecithin membrane rigidity, from ~20kBT to ~ 0,5 kBT .
Ho, Chian Sing. "Inquiry of Lipid Membranes Interacting with Functional Peptides and Polyphenol Drug Molecules". Scholar Commons, 2016. http://scholarcommons.usf.edu/etd/6255.
Texto completoLi, Yan. "The Metabolic Transitions Regulated by the Estrogen-related Receptor (ERR) in Drosophila melanogaster". VCU Scholars Compass, 2013. http://scholarscompass.vcu.edu/etd/559.
Texto completoTrueman, Steven F. "Insights Into ER Translocation Channel Gating. Structural Regulation of the Transition Between the Closed and Open Channel Conformations: A Dissertation". eScholarship@UMMS, 2011. https://escholarship.umassmed.edu/gsbs_diss/576.
Texto completoScarlett, Michael A. "Can a comprehensive transition plan to barefoot running be the solution to the injury epidemic in American endurance runners?" Scholarship @ Claremont, 2018. http://scholarship.claremont.edu/cmc_theses/1830.
Texto completoKistler, Kurt Andrew. "Using Quantum Mechanics to Investigate the Photophysical Properties of the DNA and RNA Bases and their Fluorescent Analogs". Diss., Temple University Libraries, 2010. http://cdm16002.contentdm.oclc.org/cdm/ref/collection/p245801coll10/id/73855.
Texto completoPh.D.
The ability of the nucleic acids to absorb ultraviolet light and remain relatively photostable is a property upon which life depends. The nucleobases, which are the primary chromophores, when irradiated display rapid radiationless decay back to the ground state, in general faster than is needed for photoreaction. Fluorescent analogs of these bases have structures similar to the nucleic acid bases, but display much longer excited state lifetimes. Theoretical investigations using quantum mechanical methods can provide insight into the precise mechanisms of these decay processes, and to the molecular specifics that contribute to them. The results of multi-reference configuration interaction (MRCI) ab initio investigations into these mechanisms are presented, with emphasis on cytosine and its fluorescent analog 5-methyl-2-pyrimidinone (5M2P). A comprehensive picture of the potential energy surfaces of these two bases is given, including stationary points and conical intersections, where radiationless transitions are promoted, between up to three state surfaces, as well as pathways connecting these points for each base. Cytosine is shown to have two different energetically accessible radiationless decay channels. The fluorescence of 5M2P is also demonstrated theoretically, with mechanism proposed. The potential energy surfaces of the two bases have many close similarities, with the different photophysical properties being attributed to subtle energetic differences between the two bases. Nonadiabatic coupling and the geometric phase effect are analyzed in detail near conical intersections in cytosine, including in a region close to a three-state conical intersection. A substituent effect study on the 2-pyrimidinone ring system shows that the presence, position and orientation of the amino group in cytosine is central to its photophysical properties, particularly its high absorption energy, and can be explained with a simple Frontier Molecular Orbital model. The effects of water solvent on the excitation energies of cytosine and uracil are theoretically investigated using two multi-reference ab initio methods, a quantum mechanical molecular mechanics method using MRCI (MRCI-QM/MM), and the fragment molecular orbital multiconfiguration self-consistent field method (FMO-MCSCF). The solvatochromic shifts calculated from both methods agree well with other more expensive methods and experimental data. The effects of water on the photophysical pathways of cytosine is also investigated using MRCI-QM/MM, including considerations of solvent reorganization. Results show that the overall effect of water on the decay mechanisms is small, with neither decay channel being significantly blocked or favored.
Temple University--Theses
Lopes, Pedro [Verfasser] y Hans Robert [Akademischer Betreuer] Kalbitzer. "Conformational Transitions of the Ras Protein Involved in Macromolecular Interactions and Modulated by Small Compounds. A Biophysical Approach Using NMR and X-Ray Crystallography at Ambient and High Pressures / Pedro Lopes ; Betreuer: Hans Robert Kalbitzer". Regensburg : Universitätsbibliothek Regensburg, 2018. http://d-nb.info/1182033377/34.
Texto completoKoirala, Deepak P. "Mechanochemistry, Transition Dynamics and Ligand-Induced Stabilization of Human Telomeric G-Quadruplexes at Single-Molecule Level". Kent State University / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=kent1397919270.
Texto completoCaleman, Carl. "Towards Single Molecule Imaging - Understanding Structural Transitions Using Ultrafast X-ray Sources and Computer Simulations". Doctoral thesis, Uppsala : Acta Universitatis Upsaliensis, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-7915.
Texto completoDarcy, Michael Augusto. "High Force Applications of DNA Origami Devices". The Ohio State University, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=osu1619092851712077.
Texto completoKarjalainen, Eeva-Liisa. "The choreography of protein vibrations : Improved methods of observing and simulating the infrared absorption of proteins". Doctoral thesis, Stockholms universitet, Institutionen för biokemi och biofysik, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-60415.
Texto completoAt the time of the doctoral defense, the following paper was unpublished and had a status as follows: Paper 5: Manuscript.
Huang, Yan. "Synthesis, Kinetic and Photocatalytic Studies of Porphyrin-Ruthenium-Oxo Complexes". TopSCHOLAR®, 2010. http://digitalcommons.wku.edu/theses/182.
Texto completoHe, Enuo. "Stochastic modelling of the cell cycle". Thesis, University of Oxford, 2012. http://ora.ox.ac.uk/objects/uuid:04185cde-85af-4e24-8d06-94b865771cf1.
Texto completoZhan, Hongli. "Biophysical characterization of the allosteric transition in lactose repressor protein (LacI)". Thesis, 2005. http://hdl.handle.net/1911/18842.
Texto completoCsiszar, Susan A. "The role of water in structural transitions of biophysical systems". 2005. http://link.library.utoronto.ca/eir/EIRdetail.cfm?Resources__ID=362568&T=F.
Texto completoLettieri, Steven A. "Phase transitions in models of ion-specific protein solutions". 2009. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3354770.
Texto completoLi, Xiaofei Gunton James D. Gunton James D. Rickman Jeffery M. Vavylonis Dimitrios Chaudhury Manoj K. "A study of phase transitions in globular protein solutions using Monte Carlo simulation". 2009. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3373079.
Texto completoBlouin, George C. "Alkyl isocyanides as transition state analogs for ligand entry and exit in globins". Thesis, 2008. http://hdl.handle.net/1911/22179.
Texto completo"Experimental characterization and molecular dynamics simulation of the allosteric transition in the Escherichia coli lactose repressor". Thesis, 2009. http://hdl.handle.net/1911/61933.
Texto completoFreddolino, Peter L. "Application of all-atom and coarse-grained molecular dynamics simulations to long timescale structural transitions of proteins /". 2009. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3362787.
Texto completoSource: Dissertation Abstracts International, Volume: 70-06, Section: B, page: 3363. Adviser: Klaus Schulten. Includes bibliographical references (leaves 179-201) Available on microfilm from Pro Quest Information and Learning.
"Computational Approaches to Simulation and Analysis of Large Conformational Transitions in Proteins". Doctoral diss., 2017. http://hdl.handle.net/2286/R.I.46316.
Texto completoDissertation/Thesis
Doctoral Dissertation Physics 2017
Bhattacharya, Rupak. "Structure and Dynamics of Interfacial Molecular Membranes". Thesis, 2013. https://etd.iisc.ac.in/handle/2005/3413.
Texto completoBhattacharya, Rupak. "Structure and Dynamics of Interfacial Molecular Membranes". Thesis, 2013. http://etd.iisc.ernet.in/2005/3413.
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