Dissertationen zum Thema „In vivo absorption spectroscopy“
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Jelzow, Alexander [Verfasser], Rainer Akademischer Betreuer] Macdonald, Ulrike [Akademischer Betreuer] [Woggon und Jens [Akademischer Betreuer] Steinbrink. „In vivo quantification of absorption changes in the human brain by time-domain diffuse near-infrared spectroscopy / Alexander Jelzow. Gutachter: Rainer Macdonald ; Ulrike Woggon ; Jens Steinbrink. Betreuer: Rainer Macdonald“. Berlin : Technische Universität Berlin, 2013. http://d-nb.info/1067385398/34.
Der volle Inhalt der QuelleJelzow, Alexander Verfasser], Rainer [Akademischer Betreuer] Macdonald, Ulrike [Akademischer Betreuer] [Woggon und Jens [Akademischer Betreuer] Steinbrink. „In vivo quantification of absorption changes in the human brain by time-domain diffuse near-infrared spectroscopy / Alexander Jelzow. Gutachter: Rainer Macdonald ; Ulrike Woggon ; Jens Steinbrink. Betreuer: Rainer Macdonald“. Berlin : Technische Universität Berlin, 2013. http://d-nb.info/1067385398/34.
Der volle Inhalt der QuelleHani, Umama. „Regulation of cyclic and pseudocyclic electron transport“. Electronic Thesis or Diss., université Paris-Saclay, 2024. http://www.theses.fr/2024UPASB044.
Der volle Inhalt der QuellePhotosynthesis acts as the main gateway for energy production in natural environments and relies on the electron flow via several complexes in the thylakoid membrane of photosynthetic organisms. The major flux is “linear” electron transport, which involves the transfer of electrons from water to NADP⁺, coupled with the ATP synthesis. Photosynthetic water oxidation is catalyzed by manganese cluster (Mn₄CaO₅) at photosystem II (PSII). To ensure an optimal balance between the amount of energy produced and consumed, photosynthetic organisms divert part of the harvested light energy from “linear” to “alternative” electron transport pathways. Among those pathways are cyclic and pseudocyclic electron transport around Photosystem I (PSI), which supplies extra ATP to meet metabolic demands. Moreover, specialized redox systems, called " thioredoxins " are responsible for maintaining the redox status and fast acclimation of plants to constantly fluctuating environments, which could otherwise lead to toxic levels of reactive oxygen species (ROS) production. We studied the effects of manganese (Mn) excess and deficiency on photosynthetic electron transport in the liverwort Marchantia polymorpha. We have shown that Mn homeostasis has an effect at both metabolic and photosynthetic levels. Moreover, we have studied the in vivo redox changes of P700 and PC using KLAS-NIR spectrophotometer and have shown that Mn deficiency seems to enhance cyclic electron transport (CET), that may indicate the presence of supercomplexes containing PSI and cytochrome b6f complex. The second part of this PhD focused on the redox regulation of oxygen reduction (pseudocyclic electron transport) at the PSI acceptor side. By using indirect spin trapping EPR spectroscopy, we have shown that Arabidopsis thaliana wild type plants generate more ROS in short day (SD) photoperiod than in long day (LD) photoperiod. Further, the current study highlighted the role of several players in redox regulation; including thioredoxins and several other lumenal and stromal proteins. Moreover, I explored that the transfer of reducing powers from stroma to lumen is mediated by a protein called CCDA and that reversible attachment of Trxm to the thylakoid membrane acts as the driving force for higher ROS under the SD light regime. Overall, this research establishes a strong connection between cyclic and pseudocyclic electron transport in terms of thioredoxins mediated redox regulations and also paves the way to further explore CET under different stress conditions
Wirth, Adrian. „Attosecond transient absorption spectroscopy“. Diss., lmu, 2011. http://nbn-resolving.de/urn:nbn:de:bvb:19-140120.
Der volle Inhalt der QuelleArita, Yoshihiko. „Multi-mode absorption spectroscopy“. Thesis, University of Oxford, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.489407.
Der volle Inhalt der QuelleHageman, Stephen James. „Complex Attosecond Transient-absorption Spectroscopy“. The Ohio State University, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=osu1608050018545904.
Der volle Inhalt der QuelleDurrant, James Robert. „Transient absorption spectroscopy of photosystem two“. Thesis, Imperial College London, 1991. http://hdl.handle.net/10044/1/11455.
Der volle Inhalt der QuelleDavidson, Stephen John. „Absorption spectroscopy in near LTE plasmas“. Thesis, Queen's University Belfast, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.241501.
Der volle Inhalt der QuelleFiedler, Sven E. „Incoherent broad band cavity enhanced absorption spectroscopy“. [S.l.] : [s.n.], 2005. http://deposit.ddb.de/cgi-bin/dokserv?idn=97431966X.
Der volle Inhalt der QuelleHoward, John Brooks. „Double point contact single molecule absorption spectroscopy“. Diss., Atlanta, Ga. : Georgia Institute of Technology, 2009. http://hdl.handle.net/1853/31648.
Der volle Inhalt der QuelleCommittee Chair: Marchenkov, Alexei; Committee Member: Davidovic, Dragomir; Committee Member: Gole, James; Committee Member: Hunt, William; Committee Member: Reido, Elisa. Part of the SMARTech Electronic Thesis and Dissertation Collection.
McCarthy, Richard Ivor. „GUSTO : a differential UV absorption spectroscopy instrument“. Thesis, Imperial College London, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.430743.
Der volle Inhalt der QuelleGriffiths, T. R. „Development studies of concentration modulated absorption spectroscopy“. Thesis, Swansea University, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.637100.
Der volle Inhalt der QuelleShiwai, B. A. „X-ray absorption spectroscopy of dense plasmas“. Thesis, University of Essex, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.235244.
Der volle Inhalt der QuelleSimpson, Emma. „Attosecond transient absorption spectroscopy in atomic species“. Thesis, Imperial College London, 2016. http://hdl.handle.net/10044/1/44970.
Der volle Inhalt der QuelleErni, Peter. „Early nucleosynthesis studies with quasar absorption line spectroscopy“. [S.l.] : [s.n.], 2007. http://deposit.ddb.de/cgi-bin/dokserv?idn=983739854.
Der volle Inhalt der QuelleMa, Tongmei, und 馬彤梅. „Cavity ringdown laser absorption spectroscopy of free radicals“. Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2004. http://hub.hku.hk/bib/B30137342.
Der volle Inhalt der QuelleStringer, M. R. „Laser-induced transient absorption spectroscopy of phthalocyanine dyes“. Thesis, Open University, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.354989.
Der volle Inhalt der QuelleAliwell, Simon Richard. „Measurement of atmospheric trace gases by absorption spectroscopy“. Thesis, University of Cambridge, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.388668.
Der volle Inhalt der QuelleFoo, James. „Laser absorption spectroscopy and tomography of gas flows“. Thesis, University of Manchester, 2017. https://www.research.manchester.ac.uk/portal/en/theses/laser-absorption-spectroscopy-and-tomography-of-gas-flows(47a30c34-4290-4b28-bcb4-bbfa94cc5859).html.
Der volle Inhalt der QuelleLewis, Thomas Robert. „Time-resolved absorption spectroscopy applied to tropospheric chemistry“. Thesis, University of Leeds, 2017. http://etheses.whiterose.ac.uk/18122/.
Der volle Inhalt der QuelleZhang, Siyuan. „Absorption spectroscopy and atomistic modelling on nitride semiconductors“. Thesis, University of Cambridge, 2014. https://www.repository.cam.ac.uk/handle/1810/283955.
Der volle Inhalt der QuelleShokry, Dina. „Predicting human intestinal absorption using chromatography and spectroscopy“. Thesis, University of Huddersfield, 2017. http://eprints.hud.ac.uk/id/eprint/34142/.
Der volle Inhalt der QuelleSmila-Castro, Ornella. „X-ray absorption spectroscopy studies of electrochemical processes“. Thesis, University of Birmingham, 2012. http://etheses.bham.ac.uk//id/eprint/3766/.
Der volle Inhalt der QuelleLee, Jonathan Richard Ian. „X-ray absorption spectroscopy studies of electrode surfaces“. Thesis, University of Cambridge, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.615888.
Der volle Inhalt der QuelleChadwick, Alan V., und Shelley L. P. Savin. „X-Ray absorption spectroscopy measurements on nanocrystalline materials“. Universitätsbibliothek Leipzig, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-186608.
Der volle Inhalt der QuelleBergin, Ann G. V. „Applications of optical-feedback cavity-enhanced absorption spectroscopy“. Thesis, University of Oxford, 2013. http://ora.ox.ac.uk/objects/uuid:26ecc3d0-2aa1-4d21-a698-dc362956280b.
Der volle Inhalt der QuelleChadwick, Alan V., und Shelley L. P. Savin. „X-Ray absorption spectroscopy measurements on nanocrystalline materials“. Diffusion fundamentals 12 (2010) 17, 2010. https://ul.qucosa.de/id/qucosa%3A12819.
Der volle Inhalt der QuelleLeal, Luis Carlos Avila. „Intracavity absorption spectroscopy with Er3+-doped fiber lasers“. Master's thesis, Universidade de Aveiro, 2011. http://hdl.handle.net/10773/7371.
Der volle Inhalt der QuelleEspectroscopia de absorção de intracavidade com um laser de banda larga de fibra dopada com Er3+ é aplicada para medidas resolvidas no tempo de moléculas de CO2 revelando informações quantitativas sobre a concentração do gás exalado na respiração humana. A gama espectral das medições estende-se de 1.52 μm – 1.61 μm através da deslocação da lente de intracavidade. Com um laser pulsado aplicado nesta experiência, a sensibilidade à absorção corresponde a um comprimento do percurso de absorção efectiva de 6 km assumindo que a cavidade está completamente preenchida com a amostra. O aumento da sensibilidade é alcançada através da construção de um laser de configuração em anel unidirecional. O comprimento do percurso de absorção efectiva é aumentado por um factor de três comparando com uma configuração linear com o mesmo comprimento da cavidade.
Intracavity absorption spectroscopy with a broadband Er3+-doped fiber laser is applied for time-resolved measurements of CO2 molecules revealing quantitative information about the gas concentration in exhaled human breath. The spectral range of measurements extends from 1.52 to 1.61 μm by moving an intracavity lens. With a pulsed laser applied in this experiment, the sensitivity to absorption corresponds to an effective absorption path length of 6 km assuming the cavity is completely filled with the sample. Sensitivity enhancement is achieved by employing an unidirectional ring laser. The effective absorption path length is enhanced by a factor of three compared to a linear configuration with the same cavity length.
Göktaş, Oktay Güneş Mehmet. „Subgap Absorption Spectroscopy In Microcrystalline Silicon Thin Films/“. [s.l.]: [s.n.], 2004. http://library.iyte.edu.tr/tezler/master/fizik/T000461.pdf.
Der volle Inhalt der QuelleCocola, Lorenzo. „Tunable diode laser absorption spectroscopy for oxygen detection“. Doctoral thesis, Università degli studi di Padova, 2012. http://hdl.handle.net/11577/3422063.
Der volle Inhalt der QuelleL’evoluzione delle sorgenti laser a diodo per le comunicazioni ottiche negli ultimi anni ha portato ad una disponibilità commerciale di dispositivi che si prestano alla spettroscopia di assorbimento di gas nel vicino e medio infrarosso. In questo lavoro si mostra come i limiti tradizionali della spettroscopia di assorbimento a diodi laser sintonizzabili vengano affrontati con tecniche di elaborazione numerica di segnali ed una attenta progettazione ottica rivolta alla realizzazione di strumenti per il rilevamento di gas caratterizzati dalla stabilità, robustezza ed affidabilità necessari per un ambiente industriale. Trattandosi di uno dei gas più critici per il rilevamento con questa tecnica, l’ossigeno è stato affrontato sotto molteplici aspetti di misura come: • Monitoraggio non invasivo; • Rilevazione di gas in mezzi diffondenti; • Rilevazione tramite bersagli retrodiffondenti; • Tecniche di misura di pressione per deboli segnali di assorbimento; • Rilevazione dinamica con risoluzione temporale; • Misure di temperatura attraverso spettroscopia di assorbimento. Molti di questi aspetti sono stati considerati simultaneamente portando allo sviluppo di strumenti appropriati ad un uso nel mondo reale in applicazioni industriali quali: • Rilevazione di ossigeno in contenitori parzialmente trasparenti come bottiglie di vino e bibite; • Controllo di macchine per il riempimento di pannelli isolanti in vetrocamera; • Rilevazione di ossigeno in contenitori con bersagli retrodiffondenti, quali confezioni alimentari. Altre applicazioni della tecnica ed esperimenti sulla spettroscopia di assorbimento di gas in mezzi porosi sono stati esplorati durante un periodo di 6 mesi presso Lunds Universitet - Lunds Tekniska Högskola - Atomfysik (Svezia) sotto la supervisione del Prof. S. Svanberg: • Analisi di gas in campioni porosi di frutta; • Rilevazione di gas all’interno del corpo umano come tecnica per la diagnostica medica; • Misura di ossigeno in contenitori completamente diffondenti per alimenti; • Spettroscopia di assorbimento multi-riga come misura di temperatura.
Newnham, David A. „High vibrational overtone spectroscopy“. Thesis, University of Reading, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.278081.
Der volle Inhalt der QuelleHarvey, Ewan James. „Femtosecond spectroscopy of conjugated polymers“. Thesis, University of Cambridge, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.389845.
Der volle Inhalt der QuelleTrefiak, Nicholas Ronald. „Ringdown spectroscopy in optical waveguides“. Thesis, Kingston, Ont. : [s.n.], 2007. http://hdl.handle.net/1974/436.
Der volle Inhalt der QuelleCho, Suyeon. „Synthesis and characterization of refractory oxides doped with transition metal ions“. Phd thesis, Université Paris Sud - Paris XI, 2011. http://tel.archives-ouvertes.fr/tel-00856580.
Der volle Inhalt der QuellePolshakov, Dmitrii A. „Ultrafast spectroscopy and dynamics of nitrenes and carbenes“. The Ohio State University, 2005. http://rave.ohiolink.edu/etdc/view?acc_num=osu1130968887.
Der volle Inhalt der QuelleBingham, Kathryn Ruth. „In vivo '1'3C spectroscopy at 3 Tesla“. Thesis, University of Nottingham, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.262964.
Der volle Inhalt der QuelleKraft, Robert A. (Robert Arthur) 1970. „In vivo two-dimensional NMR correlation spectroscopy“. Thesis, Massachusetts Institute of Technology, 1999. http://hdl.handle.net/1721.1/85271.
Der volle Inhalt der QuelleInglis, Benjamin Alastair. „In vivo NMR spectroscopy of the brain“. Thesis, Queen Mary, University of London, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.644797.
Der volle Inhalt der QuelleSchiwon, Robert. „Cavity enhanced absorption spectroscopy von dünnen Filmen mit Ferninfrarotstrahlung“. [S.l.] : [s.n.], 2004. http://deposit.ddb.de/cgi-bin/dokserv?idn=97198235X.
Der volle Inhalt der QuelleWirth, Adrian [Verfasser], und Ferenc [Akademischer Betreuer] Krausz. „Attosecond transient absorption spectroscopy / Adrian Wirth. Betreuer: Ferenc Krausz“. München : Universitätsbibliothek der Ludwig-Maximilians-Universität, 2011. http://d-nb.info/1019930233/34.
Der volle Inhalt der QuelleAnselmo, Christophe. „Atmospheric greenhouse gases detection by optical similitude absorption spectroscopy“. Thesis, Lyon, 2016. http://www.theses.fr/2016LYSE1131/document.
Der volle Inhalt der QuelleThis thesis concerns the theoretical and experimental development of a new methodology for greenhouse gases detection based on the optical absorption. The problem relies on the unambiguous retrieval of a gas concentration from differential absorption measurements, in which the spectral width of the light source is wider than one or several absorption lines of the considered target gas given that the detection is not spectrally resolved. This problem could lead to the development of a robust remote sensing instrument dedicated to greenhouse gas observation, without strong technology limitations on the laser source as well as on the detection system. Solving this problem, we could propose a new methodology named: "Optical Similitude Absorption Spectroscopy" (OSAS).This methodology thus allows to determine a quantitative target gas concentration from non-resolved differential absorption measurements avoiding the use of a gas concentration calibration procedure. Thereby, a precise knowledge of the emitted power spectral density of the light source and the efficiency of the detection system are needed.This work that has been recently published could demonstrate that this new methodology applied on the NIR remains accurate even in the presence of strong atmospheric pressure and temperature gradients. Moreover, we show that inverting spectrally integrated measurements which follow the Beer-Lambert law leads to solve a nonlinear system. For this, a new inversion algorithm has been developed. It was experimentally verified in laboratory on methane by using coherent and non-coherent broadband light sources. The detection of methane in the atmosphere could be also realized by coupling the OSAS methodology and the Lidar technique. Outlooks are proposed and especially on the detection of greenhouse gases in the infrared spectral domain as well as the ability to simultaneously detect several atmospheric molecules of interest
Nadeau, Patrice. „Measurement of residence time distribution by laser absorption spectroscopy“. Thesis, McGill University, 1995. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=22666.
Der volle Inhalt der QuelleO'Grady, C. E. „Fundamental research into aerosols for analytical atomic absorption spectroscopy“. Thesis, University of Aberdeen, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.377568.
Der volle Inhalt der QuelleToomes, Rachel Louise. „Reflection-absorption infrared spectroscopy of adsorbates on Co{1010}“. Thesis, University of Cambridge, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.362815.
Der volle Inhalt der QuelleWitonsky, Scott Kenneth 1975. „Kinetics and dynamics measured using IntraCavity Laser Absorption Spectroscopy“. Thesis, Massachusetts Institute of Technology, 2002. http://hdl.handle.net/1721.1/8045.
Der volle Inhalt der QuelleVita.
Includes bibliographical references (p. 133-138).
IntraCavity Laser Absorption Spectroscopy (ICLAS) is a high-resolution, high sensitivity spectroscopic method capable of measuring line positions, linewidths, lineshapes, and absolute line intensities with a sensitivity that far exceeds that of a traditional multiple pass absorption cell or Fourier Transform spectrometer. From the fundamental knowledge obtained through these measurements, information about the underlying spectroscopy, dynamics, and kinetics of the species interrogated can be derived. The construction of an ICLA Spectrometer will be detailed, and the measurements utilizing ICLAS will be discussed, as well as the theory of operation and modifications of the experimental apparatus. Results include: i) Line intensities and collision-broadening coefficients of the A band of oxygen and previously unobserved, high J, rotational transitions of the A band, hot-band transitions, and transitions of isotopically substituted species. ii) High-resolution (0.013 cm-1) spectra of the second overtone of the OH stretch of trans-nitrous acid recorded between 10,230 and 10,350 cm-1. The spectra were analyzed to yield a complete set of rotational parameters and an absolute band intensity, and two groups of anharmonic perturbations were observed and analyzed. These findings are discussed in the context of the contribution of overtone-mediated processes to OH radical production in the lower atmosphere.
(cont.) iii) The implementation of Correlated Double Sampling (CDS) for time-resolved studies of CN fragments generated by the excimer laser photolysis of acrylonitrile. iv) The extension of ICLAS to study the kinetics of a test system. Nitrosyl hydride, HNO, was reacted with oxygen in a flow cell, and the subsequent chemistry was monitored using an electronic transition of HNO. Analysis of the rate equations and time integrated measured signal yielded a preliminary value for the rate constant of the reaction, HNO + 02 [right arrow] products.
by Scott Kenneth Witonsky.
Ph.D.
Northern, Jonathen Henry. „Multi-species detection using Infrared Multi-mode Absorption Spectroscopy“. Thesis, University of Oxford, 2013. http://ora.ox.ac.uk/objects/uuid:10f3bd62-4c81-4eaf-854d-1f388af73be9.
Der volle Inhalt der QuelleRosen, Gregory Todd. „X-ray Absorption Fine Spectroscopy of Amorphous Selenium Nanowires“. Ohio University Honors Tutorial College / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=ouhonors1294448896.
Der volle Inhalt der QuelleDing, Yun. „High sensitivity absorption spectroscopy of molecules of atmospheric interest“. Université Joseph Fourier (Grenoble), 2004. http://www.theses.fr/2004GRE10123.
Der volle Inhalt der QuelleThe present work is devoted to the recording and anlysis of highly excited vibrational state of molecules of atmospheric interest with several high sensitive absorption techniques : intracavity laser absorption spectrometry (ICLAS) based on a Vertical External Cavity Surface Emitting Lasers (VeCSEL) near 1 æm, Fourier transform spectroscopy and cw-Cavity Ring Down Spectroscopy in the mid-infrared region. For 13CO2, the rotational analysis and vibrational assignments of the observed upper states have been performed on the basis of predictions of the effective Hamiltonian. New global fittings of the line positions of by gathering the present line positions with prévious measurements were performed for 13C16O2 and 16O13C18O. The parameters of the reduced effective Hamiltonian were derived. Line intensities of seven 13C16O2 bands were also recorded. The vibrational structure of SiHCI3 and rotational analysis of other molecules (H70GeD3, DOCI and H2S) are also presented. Their rovibrational parameters are obtained and strong interactions are evidenced and analized for most of the studied bands
Thompson, Alexander W. J. „Multimode absorption spectroscopy of CO and CO₂ gas mixtures“. Thesis, University of Oxford, 2013. http://ora.ox.ac.uk/objects/uuid:ebcb2031-1165-414e-88d8-69465bdaf291.
Der volle Inhalt der QuelleBobrowski, Nicole. „Volcanic gas studies by Multi Axis Differential Absorption Spectroscopy“. [S.l. : s.n.], 2006. http://nbn-resolving.de/urn:nbn:de:bsz:16-opus-60521.
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