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Dissertations / Theses on the topic 'Thin layer chromatography (TLC)'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Stephens, Frank Lanier. "Thin layer chromatography - flame ionization detection analysis of in-situ petroleum biodegradation." Texas A&M University, 2004. http://hdl.handle.net/1969.1/1039.

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This research was initiated after a 100-year flood caused an oil spill on the San Jacinto River (Houston, Texas) in October of 1994. After the floodwaters subsided the released petroleum floating on the water was deposited on the surrounding lands. The petroleum spill was used as an opportunity to research intrinsic petroleum biodegradation in a 9-acre petroleum impacted estuarine wetland. The first phase of this research (Phase I) began in December 1994, approximately 1.5 months after the spill of opportunity and involved the study and quantification of in-situ petroleum biodegradation. The

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2

Coelho, Susete. "Determinação expedita de aminas biogénicas em cogumelos por TLC." Master's thesis, Instituto Politécnico de Bragança, Escola Superior Agrária, 2012. http://hdl.handle.net/10198/7608.

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A presença de aminas biogénicas nos alimentos é um ponto crítico da segurança alimentar pela sua ligação a casos de intoxicações alimentares, sendo por isso importante testar e otimizar novas metodologias analíticas para a deteção e quantificação destes compostos. Neste trabalho, pretendeu-se otimizar uma metodologia baseada na técnica de cromatografia em camada fina para analisar 7 aminas biogénicas: cadaverina, espermina, espermidina, putrescina, tiramina, 2-feniletilamina e histamina. Numa primeira fase, testou-se a eficácia de separação de três eluentes distintos, tendo-se selecionando o

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3

Dhunna, Manan. "Desorption Electrospray Ionization Mass Spectrometry Imaging: Instrumentation, Optimization and Capabilities." BYU ScholarsArchive, 2014. https://scholarsarchive.byu.edu/etd/3969.

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Desorption Electrospray Ionization Mass spectrometry Imaging (DESI-MSI) is an area of great interest and a promising tool in the field of chemical imaging. It is a powerful, label-free technique, which can determine, map and visualize different molecular compounds on a sample surface. The amount of information acquired in a single DESI-MSI experiment is enormous compared to other techniques, as it can simultaneously detect different compounds with their spatial distribution on the surface. The experiment can be used to produce two-dimensional and three-dimensional images. Chapter 2 focuses on

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4

Solanský, Pavel. "Využití chromatografie na tenké vrstvě k frakcionaci a charakterizaci organické hmoty izolované z alginitu." Master's thesis, Vysoké učení technické v Brně. Fakulta chemická, 2021. http://www.nusl.cz/ntk/nusl-445143.

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This diploma thesis is focused on the study of structure and physicochemical properties of organic fractions of humic substances, which were obtained by the method of thin-layer chromatography. Humic substances, which were used in this study, were isolated from a sample of Slovak alginite based on the procedure of the International Humic Substances Society (IHSS). The following analytical techniques were selected for the characterization of isolated humic substances: thermogravimetric and elemental analysis, molecular absorption spectroscopy (UV/Vis), Fourier transform infrared spectroscopy (F

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5

González, Gaarslev Natalia. "Growth and biodegradation by Sporidiobolales yeasts in vanillin-supplemented medium." Thesis, Högskolan i Gävle, Avdelningen för arbets- och folkhälsovetenskap, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-24678.

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Studies of biodegradation in lignins by basidiomycetes yeasts show the conversion of lignin in various degradation products among which vanillin, a valuable substance, suggested to be a strong inhibitor of both fermentation and growth of yeasts, stands. Sporidiobolales yeasts used in these experiments were aimed to be identified by their highly conserved ITS region as well as studied in vanillinsupplemented medium through, vanillin-supplemented plates, TLC and Neubauer’s chamber to find out which, among the several isolates tested, were the most resistant ones, understand how they take up vani

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6

Ma, Shuguo. "Reactions of Alcohols and Organophosphonates on Tungsten Trioxide Epitaxial Films." Fogler Library, University of Maine, 2003. http://www.library.umaine.edu/theses/pdf/MaS2003.pdf.

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7

Mullis, James Onis Jr. "Planar chromatography coupled with mass spectrometry." Thesis, Georgia Institute of Technology, 1992. http://hdl.handle.net/1853/27124.

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8

Collins, Thomas. "Characterisation of mycobacterium species using radiometric growth detection and thin-layer chromatography." Thesis, University of Ulster, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.281212.

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9

Yeager, Barry Todd. "New detection techniques in high performance thin layer chromatography and related studies." Diss., The University of Arizona, 1995. http://hdl.handle.net/10150/187353.

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Recently, high performance thin layer chromatography, or HPTLC has seen considerable growth as an analytical technique. Most often perceived as a semi-quantitative or preliminary technique, in reality HPTLC is an analytical technique in its own right. Modern instrumentation, improved stationary phases, and automated techniques have found their way into the realm of HPTLC, vastly improving the scope of the technique. Today, HPTLC is a very popular analytical technique, possessing many advantages such as ease of use, high throughput, high sensitivity, and low cost. HPTLC is also applicable to a

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10

Kanyal, Supriya Singh. "Fabrication, Characterization, Optimization and Application Development of Novel Thin-layer Chromatography Plates." BYU ScholarsArchive, 2014. https://scholarsarchive.byu.edu/etd/5706.

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This dissertation describes advances in the microfabrication of thin layer chromatography (TLC) plates. These plates are prepared by the patterning of carbon nanotube (CNT) forests on substrates, followed by their infiltration with an inorganic material. This document is divided into ten sections or chapters. Chapter 1 reviews the basics of conventional TLC technology. This technology has not changed substantially in decades. This chapter also mentions some of the downsides of the conventional approach, which include unwanted interactions of the binder in the plates with the analytes, relative

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11

Zhang, Qunying. "Characterization of receptors for Escherichia coli 987P using competitive binding assays, thin-layer chromatography and gel filtration chromatography." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape2/PQDD_0023/MQ51825.pdf.

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12

Ofori, Hayford. "Characterisation of sandalwood essential oils using high performance thin-layer chromatography and high resolution gas chromatography mass spectrometry." Thesis, Edith Cowan University, Research Online, Perth, Western Australia, 2020. https://ro.ecu.edu.au/theses/2326.

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Sandalwood essential oil is extensively used in perfumes, cosmetics, and pharmaceuticals. The unique woody aroma of sandalwood essential oil is produced by (Z)-α-santalol and (Z)-β-santalol and these two compounds influence the oil quality. Variation in sesquiterpene composition and oil yield have been observed both within and across Santalum species. Gas Chromatography-Mass Spectrometry (GC-MS) is a technique commonly used to identify and quantify sesquiterpene compounds in sandalwood essential oils. High Performance Thin-Layer Chromatography (HPTLC) has yet to be fully explored as an alterna

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13

Khan, Pervaise. "Criteria for drug identification by thin layer chromatography and near infrared reflectance spectroscopy." Thesis, University College London (University of London), 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.409087.

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14

Crecelius, Anna Christina. "Thin layer chromatography-matrix assisted laser desorption ionisation-mass spectrometry of pharmaceutical compounds." Thesis, Sheffield Hallam University, 2002. http://shura.shu.ac.uk/19512/.

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Thin-layer chromatography (TLC) is of great importance for the pharmaceutical industry as a simple, quick, and low cost analytical method. Considerable effort has been made over the past decades to combine the simplicity of TLC with the selectivity and sensitivity of mass spectrometry (MS) detection. In the pharmaceutical industry sensitivity is an especially important factor, since the allowed impurity level of most drugs is under 0.1%.The aim of the present thesis was to develop methods for the direct examination of pharmaceutical compounds from TLC plates by matrix-assisted laser desorption

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15

Al-Sayegh, A. J. "Determination of mixtures of sulfonamides by pyrolysis-gas chromatography following thin-layer chromatographic separation." Thesis, University of Kent, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.379714.

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16

Momin, Vasim Rasul. "The Analysis of Antimicrobial Testing Vincetoxicum stocksii and Isolation of a Highly Active Compound Against Candida albicans by Using Various Different Techniques." Digital Archive @ GSU, 2008. http://digitalarchive.gsu.edu/chemistry_theses/9.

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The purpose is to isolate a natural compound, which shows a high activity against Candida albicans, from plant, Vincetoxicum stocksii. Bio-Assay, Thin layer Chromatography, Column Chromatography, TLC bio Assay, and other extraction techniques are used in order to isolate the active compound. First, bio assay technique is carried out on the crude gum. Next, several flash chromatography columns are carried out in order to isolate the target compound, which has a Rf value of ~0.53 in 10:1 DCM/methanol solvent mixture. The TLC bioassay technique is also carried out in order to confirm the hyp

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17

Jensen, David S. "Microfabrication, Characterization, and Application of Carbon Nanotube Templated Thin Layer Chromatography Plates, and Functionalization of Porous Graphitic Carbon." BYU ScholarsArchive, 2012. https://scholarsarchive.byu.edu/etd/3862.

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This dissertation contains the following sections. Chapter 1 contains a detailed description of the theory of thin layer chromatography (TLC). Chapter 2 describes the benefits and practical considerations of elevated temperatures in liquid chromatography (LC). The porous graphitic carbon (PGC) I modified as part of my work is often used in elevated temperature LC. Chapter 3 shows a thermodynamic analysis of chromatographic retention at elevated temperature, and Chapter 4 contains a closer look at the van 't Hoff equation in LC and how it can be used in retention modeling. In Chapter 5, I descr

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18

Manana, Jabulile Vuyiswa. "Identification of commonly used traditional medicines by planar chromatography for quality control purposes." Pretoria : [s.n.], 2008. http://upetd.up.ac.za/thesis/available/etd-09222005-104832/.

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19

Choi, Lei Lei. "Quality evaluation of Salvia miltiorrhiza based on multiple components determined by twice development thin layer chromatography." Thesis, University of Macau, 2009. http://umaclib3.umac.mo/record=b2158115.

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20

Jones, Linda. "Development of a Sol-Gel-Based Thin-Layer Chromatography Stationary Phase for in-situ Infrared Analysis." Diss., The University of Arizona, 2008. http://hdl.handle.net/10150/193589.

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A sol-gel stationary phase was developed for in-situ infrared (IR) detection of analytes on thin-layer chromatography (TLC) plates. These sol-gel-based TLC plates have improved optical properties compared with conventional TLC plates in IR spectroscopic analysis. Samples can be analyzed in transmission geometry, requiring no special attachments. The sol-gel-based TLC plates demonstrate significantly better light throughput and a wider spectral range than conventional TLC plates analyzed in diffuse reflectance geometries.The sol-gel precursor, methyltrimethoxyorthosilicate (MTES), was templated

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21

Hudson, Edward D. "The biogeochemistry of sterols in Trinity Bay, Newfoundland, and a new method (thin layer chromatography-pyrolysis-gas chromatography-mass spectrometry) for their analysis." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp03/MQ47458.pdf.

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22

Arruda, Frommenwiler Débora. "Comprehensive high performance thin layer chromatography (HPTLC) fingerprinting in quality control of herbal drugs, preparations and products." Doctoral thesis, Universitat de Barcelona, 2020. http://hdl.handle.net/10803/671745.

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Quality control of herbals has its roots in the study of morphoanatomic and organoleptic characters. Nevertheless, in the last century, with the evolution of analytical chemistry, the quality control rapidly evolved from elementary tests to the use of sophisticated instruments combined with software for data management. In the current days, many authorities and organizations recommend a suite of tests, featuring many of these instruments, to evaluate quality of herbal products. HPTLC offers a comprehensive set of data that can be used not only for identification but also to evaluate the purity

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23

Noh, Hongseok "Moses." "Parylene Microcolumn for Miniature Gas Chromatograph." Diss., Georgia Institute of Technology, 2004. http://hdl.handle.net/1853/4983.

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This research contributes to worldwide efforts to miniaturize one of the most powerful and versatile analytical tools, gas chromatography (GC). If a rapid, sensitive and selective hand-held GC system is realized, it would have a wide range of applications in many industries and research areas. As a part of developing a hand-held GC system, this research focuses on the separation column, which is the most important component of a GC system. This thesis describes the development of a miniature separation column that has low thermal mass and an embedded heating element for rapid thermal cycling.

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24

Cleary, Maryanne Viola. "Quantitative HPTLC." Thesis, This resource online, 1995. http://scholar.lib.vt.edu/theses/available/etd-07112009-040558/.

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25

Alpmann, Alexander [Verfasser], and Wolfgang [Akademischer Betreuer] Schwack. "Trace analysis of acrylamide by high-performance thin-layer chromatography coupled to mass spectrometry / Alexander Alpmann. Betreuer: Wolfgang Schwack." Hohenheim : Kommunikations-, Informations- und Medienzentrum der Universität Hohenheim, 2012. http://d-nb.info/1027353053/34.

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26

Penrose, Andrew. "The use of new ceramics, bondings and electronic systems to develop new methods and instrumentation in thin-layer chromatography." Thesis, University of Leeds, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.396591.

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27

Manana, Jabulile Vuyiswa. "Identification of commonly used traditional medicines by planar chromatography for quality control purposes." Diss., University of Pretoria, 2003. http://hdl.handle.net/2263/28107.

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28

Wang, Dong. "The Application of Thin Film Ionic Self-assembled Multilayer (ISAM) Nanostructures in Electromechanical Bending Actuators and Micro-fabricated Gas Chromatography (uGC) Devices." Diss., Virginia Tech, 2015. http://hdl.handle.net/10919/51186.

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Ionic self-assembled multilayer (ISAM) thin film nanostructures, including highly porous and conductive gold nanoparticles (GNP), and highly porous and thermally stable silica nanoparticles (SNP), were fabricated via the layer-by-layer (LbL) self-assembly technique. Their application in ionic polymer-metal composite (IPMC) electromechanical bending actuators and microfabricated gas chromatography (microGC) devices were investigated and significant performance improvements of these devices were achieved. IPMC bending actuators, consisting of an ionic electroactive polymer (iEAP) membrane as ba

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29

Chaveiro, Nádia Raquel Encarnação. "Bioacessibilidade de ácidos gordos em salmão e corvina de aquacultura." Master's thesis, ISA/UTL, 2013. http://hdl.handle.net/10400.5/5655.

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Mestrado em Engenharia Alimentar - Processamento de Alimentos - Instituto Superior de Agronomia<br>This work investigates the effect of a drastic cooking treatment in chemical composition, particularly, on lipid profile of two species of farmed fish, salmon and meagre, and quantifies the percentage of each fatty acid bioacessibility on these two species in each culinary treatment. To this end, are used methodologies for extracting total lipids (TL), based on the techniques of Bligh & Dyer (1959), for thin layer chromatography and the transesterification of fatty acid methyl esters (FAME - Fatt

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30

Hebron, Mwalwisi Yonah [Verfasser], Ulrike [Gutachter] Holzgrabe, Petra [Gutachter] Högger, and Lorenz [Gutachter] Meinel. "Assessment of Counterfeit and Substandard Antimalarial Medicines using High Performance Thin Layer Chromatography and High Performance Liquid Chromatography / Yonah Hebron Mwalwisi ; Gutachter: Ulrike Holzgrabe, Petra Högger, Lorenz Meinel." Würzburg : Universität Würzburg, 2018. http://d-nb.info/115509803X/34.

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31

ALVES, JULIANA N. "Utilização da radiação gama do cobalto-60 como tratamento quarentenário de plantas medicinais, aromáticas e condimentares desidratadas infestadas por Lasioderma serricorne (Fabricius, 1792) (Coleoptera, anobiidae e Plodia interpunctella (Hubner, 1813) (Lepidoptera, pyralidae)." reponame:Repositório Institucional do IPEN, 2007. http://repositorio.ipen.br:8080/xmlui/handle/123456789/11558.

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Made available in DSpace on 2014-10-09T12:53:14Z (GMT). No. of bitstreams: 0<br>Made available in DSpace on 2014-10-09T13:59:05Z (GMT). No. of bitstreams: 0<br>Dissertação (Mestrado)<br>IPEN/D<br>Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP

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Golding, G. M. "Micro analysis of dyes from transferred fibres." Thesis, Queensland University of Technology, 1987. https://eprints.qut.edu.au/35954/1/35954_Golding_1987.pdf.

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Thin Layer Chromatography (TLC) has been used for many years for the characterisation of dyes extracted from textile materials. It has recently been applied to the comparison of dyes extracted from short fibre monofilaments which may have been transferred during a criminal contact. The forensic methods for plate preparation and development are generally empirical, and interpretation of the chromatogram commonly based on subjective visual observations. The aim of this work was to examine systematically the Thin Layer Chromatographic separation of small quantities of dye to improve the quality

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33

Jones, David. "Synthesis, fractionation, characterisation and toxicity of naphthenic acids from complex mixtures." Thesis, University of Plymouth, 2013. http://hdl.handle.net/10026.1/1612.

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Amongst the polar organic compounds occurring in unrefined and refined crude oils and the associated polluted production waters, complex mixtures of acids, known historically as naphthenic acids (NAs), have achieved prominence. This is particularly because NAs have been designated a toxicant class of concern in the oil sands process-affected water (OSPW) that has accumulated in vast quantities following exploitation of the oil sands of Northern Alberta, Canada in recent years. However, though there have been calls for NAs to be added to pollutant inventories, at the initiation of the current s

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34

Dubeni, Zimasa Busisiwe. "Phytochemical screening and thin layer chromatographic profiling of aloe vera (l) burn. f growing in South Africa." Thesis, University of Fort Hare, 2013. http://hdl.handle.net/10353/d1016169.

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The chemical profiling, characterization of Aloe products and phytochemical properties of Aloe vera were studied. The adulteration of commercial products derived from medicinal plants has been a major muddle for both the society and the pharmaceuticalindustry. Economically motivated adulteration includes the potential for contaminated, sub‐potent or counterfeit medication to enter the supply chain at several levels, from the production of raw ingredients through to the point of retail sale. Darwin’s theory of evolution states that, species undergo genetic variation with time to adapt to enviro

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35

Nassif, Lana Amine. "The Production of 2-Keto-L-Gulonic Acid by Different Gluconobacter Strains." Thesis, Virginia Tech, 1997. http://hdl.handle.net/10919/30590.

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Vitamin C is industrially produced by the Reichstein method, which uses gluconobacters to oxidize sorbitol to sorbose then a chemical process to convert sorbose to 2-keto-L-gulonic acid (2-KLG). The establishment of a more extensive microbial process for 2-KLG production translates into a less expensive and more efficient production of vitamin C. I examined pure strains and mixed cultures for their ability to produce 2-KLG using thin layer and high performance liquid chromatography. The DSM 4027 mixed culture produced the highest yield, 25 g/L, of 2-KLG from 100 g/L of sorbose, while the gram-

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36

Colthup, Philip Victor. "Assessment of the value of high-performance thin-layer chromatography for the detection and characterisation of drugs and metabolites in biological fluids." Thesis, Liverpool John Moores University, 1993. http://researchonline.ljmu.ac.uk/4941/.

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37

Dewoolkar, Veeren. "Continuous Stationary Phase Gradients for Planar and Column Chromatography." VCU Scholars Compass, 2016. http://scholarscompass.vcu.edu/etd/4469.

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Surfaces that exhibit a gradual change in their chemical and/or physical properties are termed as surface gradients. Based on the changes in properties they are classified either as physical or chemical gradients. Chemical gradients show variations in properties like polarity, charge, functionality concentration and have found potential applications in fields of biology, physics, biosensing, catalysis and separation science. In this dissertation, surface gradients have been prepared using controlled rate infusion (CRI). CRI is a simple method in which a surface gradient is formed by carrying o

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38

Aldridge, Paul K. "Spectroscopic instrumentation for process analytical chemistry /." Thesis, Connect to this title online; UW restricted, 1991. http://hdl.handle.net/1773/8512.

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39

Owens, Cherie. "INVESTIGATIONS INTO POLYMER AND CARBON NANOMATERIAL SEPARATIONS." The Ohio State University, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=osu1345485388.

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Stegall, Stacy L. "Separation of Transition and Heavy Metals Using Stationary Phase Gradients and Chelation Thin Layer Chromatography / Evaluation of the Effectiveness of POGIL-PCL Workshops." VCU Scholars Compass, 2017. http://scholarscompass.vcu.edu/etd/4779.

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Gradient surfaces exhibit a variation in functionality along the length of the surface. One method for preparing gradients is controlled-rate infusion (CRI). In Part 1 of this work, CRI was used to prepare gradients for the purpose of separating transition and heavy metals. Initial work on this project was focused on controlling the retention of the metal ions by varying the number of amine groups, aminoalkoxysilane concentration, and the infusion time. The retention factors of four metal ions varied predictably with increasing number of amine groups, increasing aminoalkoxysilane concentr

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Ball, Jaana-Maria. "A thin layer chromatography study of the effect of low temperature on the molecular size distribution of fructans in Osteospernum sinuatum (DC.) Norlindh (Asteraceae)." Thesis, University of Cape Town, 1991. http://hdl.handle.net/11427/23946.

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Matukaitytė, Ieva. "Plonasluoksnės chromatografijos metodikos optimizavimas antidepresantų mišinio skirstymui ir identifikavimui." Master's thesis, Lithuanian Academic Libraries Network (LABT), 2013. http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2013~D_20130614_085820-42013.

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Tyrimo objektas ir metodai: tiriamieji antidepresantai: bušpirono hidrochloridas; sertralino hidrochloridas; amitriptilino hidrochloridas, fluvoksamino maleatas ir paroksetino hidrochloridas. Šių antidepresantų mišinio skirstymui ir komponentų identifikavimui plonasluoksnės chromatografijos metodu naudoti tirpikliai ir ryškinimo reagentai: metanolis, 25 proc. amonio hidroksidas, trichlormetanas, etanolis, etilacetatas, cikloheksanas, etano rūgštis, dimetilacetonas, acetonitrilas, propanolis, trifluoracto rūgštis, dichlormetanas, 1,4–dioksanas, benzenas, petrolio eteris, izoamilo spiritas, diet

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CARVALHO, LARISSA G. de. "Desenvolvimento do radiofármaco sup(18)F-acetato para detecção de tumores primários através do PET/CT." reponame:Repositório Institucional do IPEN, 2012. http://repositorio.ipen.br:8080/xmlui/handle/123456789/10140.

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Made available in DSpace on 2014-10-09T12:35:12Z (GMT). No. of bitstreams: 0<br>Made available in DSpace on 2014-10-09T13:56:12Z (GMT). No. of bitstreams: 0<br>Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)<br>Dissertação (Mestrado)<br>IPEN/D<br>Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP<br>FAPESP:11/03138-8

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Zewe, Joseph William. "The Development of Novel Nanomaterials for Separation Science." The Ohio State University, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=osu1345485921.

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Weigel, Michele. "Avaliação da contaminação por aflatoxina M1 em leite cru e leite UHT." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2007. http://hdl.handle.net/10183/11140.

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A aflatoxina M1 (AFM1) é um metabólito tóxico resultante da biotransformação da aflatoxina B1 e pode ser secretada no leite de animais que ingerem alimentos contaminados com esta última. Considerando os efeitos adversos que podem ocorrer devido à ingestão do produto contaminado e visto que as crianças, maiores consumidoras deste alimento, são potencialmente mais sensíveis que os adultos aos efeitos desta micotoxina, a avaliação da presença de AFM1 no leite se faz necessária. Durante o período de março a novembro de 2006 foram analisadas 48 amostras de leite cru provenientes de 8 propriedades f

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Song, Jun. "Fabrication and Application of Vertically Aligned Carbon Nanotube Templated Silicon Nanomaterials." BYU ScholarsArchive, 2011. https://scholarsarchive.byu.edu/etd/3086.

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A process, called carbon nanotube templated microfabrication (CNT-M) makes high aspect ratio microstructures out of a wide variety of materials by growing patterned vertically aligned carbon nanotubes (VACNTs) as a framework and then infiltrating various materials into the frameworks by chemical vapor deposition (CVD). By using the CNT-M procedure, a partial Si infiltration of carbon nanotube frameworks results in porous three dimensional microscale shapes consisting of silicon-carbon nanotube composites. The addition of thin silicon shells to the vertically aligned CNTs (VACNTs) enables the f

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Macrini, Thiago. "Análise farmacognóstica de amostras de drogas vegetais psicoativas comercializadas em Diadema." Universidade de São Paulo, 2012. http://www.teses.usp.br/teses/disponiveis/9/9138/tde-10092012-140219/.

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As plantas medicinais são conhecidas há muitos séculos pelos homens, e ainda hoje são amplamente utilizadas no tratamento de enfermidades. A população acredita que é uma alternativa segura e de baixo custo em relação aos produtos farmacêuticos industrializados, e faz seu uso indiscriminado e sem acompanhamento médico. A automedicação e a falta de controle de qualidade das drogas vegetais (DVs) representam um sério risco à saúde de seus usuários. A diversidade de espécies conhecidas como plantas medicinais, e o uso de nomes populares regionais podem ocasionar erros de identificação taxonômica o

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Rosales, Oscar. "Characterization of microbial growth in lignin-based residues and biodegradation of vanillin: : Optimizing factors for maximizing the extraction of a biodegradation compound of vanillin and investigating the potential for lipid accumulation." Thesis, Högskolan i Gävle, Miljöteknik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-24758.

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Vanillin (4-hydroxy-3methoxybenzaldehyde) is one of the most employed aromatic and flavoring additives in food and cosmetic industry. The industrial interest in vanillin could also apply to its biodegradation products. The microbial transformation of vanillin can open the possibility of new products with new areas of application for products related to vanillin. For example, vanillyl alcohol, vanillic acid and ferulic acid are currently used in the pharmaceutical or food industry. Some species reported to biodegrade vanillin into the related products vanillyl alcohol and vanillic acid, are: Br

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Gutu, Ketema Tolossa. "Bioassay-guided phytochemical study of indigenous medicinal plants of Ethiopia." Thesis, University of Edinburgh, 2018. http://hdl.handle.net/1842/28964.

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In many developing countries, farmers and pastoralists still rely on their indigenous knowledge, practices and locally available plants to control nematode parasitic infections, both in livestock and humans. The overall aim of my thesis was to undertake bioassay-guided phyto-chemical study of extracts and their constituents from Ethiopian anti-parasitic plants used by healers to control gastrointestinal nematode parasites in livestock to validate their ethno-medicinal use and to characterise and identify their active ingredients. As a first experiment (Chapter Three), four types of crude extra

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Silveira, Camila Oliveira. "Inclusão de colesterol na membrana plasmática de espermatozoides caprinos." Universidade Federal de Viçosa, 2013. http://locus.ufv.br/handle/123456789/5132.

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Made available in DSpace on 2015-03-26T13:47:12Z (GMT). No. of bitstreams: 1 texto completo.pdf: 765049 bytes, checksum: dcb0cc188aa67726f24e856817503e00 (MD5) Previous issue date: 2013-02-22<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior<br>The aim of this study was to evaluate the fertilizing capacity, acrosomal integrity, and qualify and quantify by chromatographic techniques the incorporation of cholesterol to the sperm membrane by cyclodextrin in different diluents on cryopreservation of goat sperm. Four males, Saanen (2) and Parda Alpine (2) breeds were used. It was per

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