Relevant bibliographies by topics / TGA

Academic literature on the topic 'TGA'

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Published: 4 June 2021
Last updated: 8 June 2024

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Journal articles on the topic "TGA"

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Zhou, Jun-Ma, Youssef Trifa, Herman Silva, Dominique Pontier, Eric Lam, Jyoti Shah, and Daniel F. Klessig. "NPR1 Differentially Interacts with Members of the TGA/OBF Family of Transcription Factors That Bind an Element of the PR-1 Gene Required for Induction by Salicylic Acid." Molecular Plant-Microbe Interactions® 13, no. 2 (February 2000): 191–202. http://dx.doi.org/10.1094/mpmi.2000.13.2.191.

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NPR1 is a critical component of the salicylic acid (SA)-mediated signal transduction pathway leading to the induction of defense genes, such as the pathogenesis-related (PR)-1 gene, and enhanced disease resistance. Using a yeast two-hybrid screen, we identified several NPR1-interacting proteins (NIPs). Two of these NIPs are members of the TGA/OBF family of basic leucine zipper (bZIP) transcription factors; this family has been implicated in the activation of SA-responsive genes, including PR-1. Six TGA family members were tested and shown to differentially interact with NPR1: TGA2 and TGA3 showed strong affinity for NPR1; TGA5 and TGA6 exhibited weaker affinity; and TGA1 and TGA4 displayed little or no detectable interaction with NPR1, respectively. Interestingly, the amino-termini of these factors were found to decrease their stability in yeast and differentially affect their apparent affinity toward NPR1. The interacting regions on NPR1 and the TGA factors were also defined. Each of four point mutations in NPR1 that disrupt SA signaling in Arabidopsis completely blocked interaction of NPR1 with TGA2 and TGA3. TGA2 and TGA3 were also found to bind the SA-responsive element of the Arabidopsis PR-1 promoter. These results directly link NPR1 to SA-induced PR-1 expression through members of the TGA family of transcription factors.
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Harfouche, Tieme Breternitz, Ana Paula Dalla Corte, Marieli Ruza, and Alexandre Behling. "USO DE APLICATIVOS EM SMARTPHONE PARA MEDIÇÕES DE ÁRVORES." BIOFIX Scientific Journal 4, no. 1 (January 6, 2019): 07. http://dx.doi.org/10.5380/biofix.v4i1.62532.

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Este trabalho visou verificar a precisão de aplicativos de smartphone para medir indiretamente a altura de árvores e a distância entre o operador e a árvore. Como testemunha para medir altura, adotou-se o Hipsômetro Vertex IV (T0a) e, para distância, a variável medida com trena (T0b). Foram selecionadas 30 árvores isoladas do Campus da Universidade Federal do Paraná em Curitiba - PR e 30 árvores pertencentes à um plantio de Eucalyptus sp. na Fazenda Experimental Canguiri em Pinhais – PR. Foram 7 tratamentos testados para altura: Smart Measure (T1a), sMeasure (T2a), Distance meter (T3a), Hypsometer (T4a), 3D-Prumo (T5a), Height and Distance (T6a) e Tree-H (T7a). Foram 8 tratamentos para medir distância: Smart Measure (T1b), sMeasure (T2b), Distance meter (T3b), Hypsometer (T4b), 3D-Prumo (T5b), Height and Distance (T6b), Easy Measure (T7b) e Smart Distance (T8b). Avaliou-se a precisão dos aplicativos com o teste t de Student pareado com 5% de significância em relação às testemunhas e cálculo dos erros. Para altura em árvores isoladas, o tratamento T2a apresentou diferença estatística a probabilidade de 5%. O tratamento T6a obteve menor erro (2,48 m). No plantio de Eucalyptus sp., os tratamentos T1a, T6a e T7a apresentaram diferenças significativas e T3a obteve menor erro (2,99 m). Para a medição de distância em árvores isoladas, os tratamentos T4b e T6b não apresentaram diferença e T4b apresentou menor erro (2,28 m). No plantio, todos apresentaram diferença estatística. A incorporação de aplicativos para smartphones é alternativa para uso em inventários florestais para alturas. Para distâncias, deve-se ter cautela.
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Shearer, Heather L., Lipu Wang, Catherine DeLong, Charles Despres, and Pierre R. Fobert. "NPR1 enhances the DNA binding activity of the Arabidopsis bZIP transcription factor TGA7This paper is one of a selection of papers published in a Special Issue from the National Research Council of Canada – Plant Biotechnology Institute." Botany 87, no. 6 (June 2009): 561–70. http://dx.doi.org/10.1139/b08-143.

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Pathogen-induced transcriptional reprogramming of the plant genome is mediated predominantly by the cofactor NPR1 (NON-EXPRESSOR OF PATHOGENESIS-RELATED GENES1). NPR1 lacks any known DNA-binding domain and is proposed to regulate transcription through interactions with TGA transcription factors that bind to as-1-like promoter elements. Previous studies have focused on the interaction of NPR1 with subgroup I (TGA1, TGA4) or subgroup II (TGA2, TGA5, TGA6) factors. Using the yeast two-hybrid system, we showed that a member of subgroup III (TGA7) interacts with wild-type NPR1 but not with mutants in the ankyrin repeats that are important for disease resistance. Mutations in the NPR1 BTB/POZ domain also greatly reduced interaction with TGA7. NPR1 substantially increased the binding of TGA7 to cognate promoter elements in vitro, including a salicylic-acid-inducible element of the PR-1 promoter. While TGA7 interacted with all TGA factors tested, interactions were not observed between TGA2 and subgroup I factors, indicating that cross-clade interaction is not a general property of the family. Transcripts from subgroup III TGA factors were weakly inducible by salicylic acid and pathogens, but only TGA3 expression was dependent on NPR1. These results suggest that NPR1-mediated DNA binding of TGA7 could regulate the activation of defense genes.
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Wong, Tit-Yee, Sanjit Fernandes, Naby Sankhon, Patrick P. Leong, Jimmy Kuo, and Jong-Kang Liu. "Role of Premature Stop Codons in Bacterial Evolution." Journal of Bacteriology 190, no. 20 (August 15, 2008): 6718–25. http://dx.doi.org/10.1128/jb.00682-08.

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ABSTRACT When the stop codons TGA, TAA, and TAG are found in the second and third reading frames of a protein-encoding gene, they are considered premature stop codons (PSC). Deinococcus radiodurans disproportionately favored TGA more than the other two triplets as a PSC. The TGA triplet was also found more often in noncoding regions and as a stop codon, though the bias was less pronounced. We investigated this phenomenon in 72 bacterial species with widely differing chromosomal GC contents. Although TGA and TAG were compositionally similar, we found a great variation in use of TGA but a very limited range of use of TAG. The frequency of use of TGA in the gene sequences generally increased with the GC content of the chromosome, while the frequency of use of TAG, like that of TAA, was inversely proportional to the GC content of the chromosome. The patterns of use of TAA, TGA and TAG as real stop codons were less biased and less influenced by the GC content of the chromosome. Bacteria with higher chromosomal GC contents often contained fewer PSC trimers in their genes. Phylogenetically related bacteria often exhibited similar PSC ratios. In addition, metabolically versatile bacteria have significantly fewer PSC trimers in their genes. The bias toward TGA but against TAG as a PSC could not be explained either by the preferential usage of specific codons or by the GC contents of individual chromosomes. We proposed that the quantity and the quality of the PSC in the genome might be important in bacterial evolution.
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Shearer, Heather L., Yu Ti Cheng, Lipu Wang, Jinman Liu, Patrick Boyle, Charles Després, Yuelin Zhang, Xin Li, and Pierre R. Fobert. "Arabidopsis Clade I TGA Transcription Factors Regulate Plant Defenses in an NPR1-Independent Fashion." Molecular Plant-Microbe Interactions® 25, no. 11 (November 2012): 1459–68. http://dx.doi.org/10.1094/mpmi-09-11-0256.

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Transcriptional reprogramming during induction of salicylic acid (SA)-mediated defenses is regulated primarily by NPR1 (NONEXPRESSOR OF PATHOGENESIS-RELATED GENES 1), likely through interactions with TGA bZIP transcription factors. To ascertain the contributions of clade I TGA factors (TGA1 and TGA4) to defense responses, a tga1-1 tga4-1 double mutant was constructed and challenged with Pseudomonas syringae and Hyaloperonospora arabidopsidis. Although the mutant displayed enhanced susceptibility to virulent P. syringae, it was not compromised in systemic acquired resistance against this pathogen or resistance against avirulent H. arabidopsidis. Microarray analysis of nonelicited and SA-treated plants indicated that clade I TGA factors regulate fewer genes than NPR1. Approximately half of TGA-dependent genes were regulated by NPR1 but, in all cases, the direction of change was opposite in the two mutants. In support of the microarray data, the NPR1-independent disease resistance observed in the autoimmune resistance (R) gene mutant snc1 is partly compromised by tga1-1 tga4-1 mutations, and a triple mutant of clade I TGA factors with npr1-1 is more susceptible than either parent. These results suggest that clade I TGA factors are required for resistance against virulent pathogens and avirulent pathogens mediated by at least some R gene specificities, acting substantially through NPR1-independent pathways.
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Iismaa, Siiri E., Bryony M. Mearns, Laszlo Lorand, and Robert M. Graham. "Transglutaminases and Disease: Lessons From Genetically Engineered Mouse Models and Inherited Disorders." Physiological Reviews 89, no. 3 (July 2009): 991–1023. http://dx.doi.org/10.1152/physrev.00044.2008.

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The human transglutaminase (TG) family consists of a structural protein, protein 4.2, that lacks catalytic activity, and eight zymogens/enzymes, designated factor XIII-A (FXIII-A) and TG1-7, that catalyze three types of posttranslational modification reactions: transamidation, esterification, and hydrolysis. These reactions are essential for biological processes such as blood coagulation, skin barrier formation, and extracellular matrix assembly but can also contribute to the pathophysiology of various inflammatory, autoimmune, and degenerative conditions. Some members of the TG family, for example, TG2, can participate in biological processes through actions unrelated to transamidase catalytic activity. We present here a comprehensive review of recent insights into the physiology and pathophysiology of TG family members that have come from studies of genetically engineered mouse models and/or inherited disorders. The review focuses on FXIII-A, TG1, TG2, TG5, and protein 4.2, as mice deficient in TG3, TG4, TG6, or TG7 have not yet been reported, nor have mutations in these proteins been linked to human disease.
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Barbalho, Sandra Maria, Ana Paula Machado Spada, Erick Prado de Oliveira, Márcio Emilio Paiva-Filho, Karla Aparecida Martuchi, Náyra Coelho Leite, Renata Maeda Deus, Vivianne Sasaki, Lucas Silva Braganti, and Marie Oshiiwa. "Mentha piperita effects on wistar rats plasma lipids." Brazilian Archives of Biology and Technology 52, no. 5 (October 2009): 1137–43. http://dx.doi.org/10.1590/s1516-89132009000500011.

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The aim of this study was to demonstrate the effects of Mentha piperita juice and tea on plasma lipids of Wistar rats. The animals were divided in control group (CG) and four treated groups: TG1 treated with tea and TG2 treated with juice (both receiving commercial rat chow); TG3 and TG4 were fed with supplemented fat chow (with hydrogenated fat and soybean oil) and treated respectively with tea and juice. Both tea and juice were administered by intra-gastric route (gavage) two times a day for 30 days. TG2 and TG4 animals showed significant decrease in triacylglycerols and increase in HDL-c levels. TG1 and TG2 also showed lower cholesterol values. The levels of LDL-c increased in CG but decreased in the treated groups. Animals of TG1, TG2 and TG4 showed substantial reduction in food intake and in percentage of weight gain. TG3 increased food intake but did not increase the percentage of weight gain.
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Korkmaz, Gürkan, Mikael Holm, Tobias Wiens, and Suparna Sanyal. "Comprehensive Analysis of Stop Codon Usage in Bacteria and Its Correlation with Release Factor Abundance." Journal of Biological Chemistry 289, no. 44 (September 12, 2014): 30334–42. http://dx.doi.org/10.1074/jbc.m114.606632.

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We present a comprehensive analysis of stop codon usage in bacteria by analyzing over eight million coding sequences of 4684 bacterial sequences. Using a newly developed program called “stop codon counter,” the frequencies of the three classical stop codons TAA, TAG, and TGA were analyzed, and a publicly available stop codon database was built. Our analysis shows that with increasing genomic GC content the frequency of the TAA codon decreases and that of the TGA codon increases in a reciprocal manner. Interestingly, the release factor 1-specific codon TAG maintains a more or less uniform frequency (∼20%) irrespective of the GC content. The low abundance of TAG is also valid with respect to expression level of the genes ending with different stop codons. In contrast, the highly expressed genes predominantly end with TAA, ensuring termination with either of the two release factors. Using three model bacteria with different stop codon usage (Escherichia coli, Mycobacterium smegmatis, and Bacillus subtilis), we show that the frequency of TAG and TGA codons correlates well with the relative steady state amount of mRNA and protein for release factors RF1 and RF2 during exponential growth. Furthermore, using available microarray data for gene expression, we show that in both fast growing and contrasting biofilm formation conditions, the relative level of RF1 is nicely correlated with the expression level of the genes ending with TAG.
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Sancetta, Biagio Maria, Lorenzo Ricci, Giovanni Assenza, Marilisa Boscarino, Flavia Narducci, Carlo Vico, Vincenzo Di Lazzaro, and Mario Tombini. "EPIAMNE: A New Scoring System for Differentiating Transient EPIleptic AMNEsia from Transient Global Amnesia." Brain Sciences 12, no. 12 (November 29, 2022): 1632. http://dx.doi.org/10.3390/brainsci12121632.

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Transient epileptic amnesia (TEA) is a rare cause of acute amnestic syndromes (AAS), often misdiagnosed as transient global amnesia (TGA). We proposed a scoring system—the EPIlepsy AMNEsia (EPIAMNE) score—using quantitative EEG (qEEG) analysis to obtain a tool for differentiating TEA from TGA. We retrospectively reviewed clinical information and standard EEGs (stEEG) of 19 patients with TEA and 21 with TGA. We computed and compared Power Spectral Density, demonstrating an increased relative theta power in TGA. We subsequently incorporated qEEG features in EPIAMNE score, together with clinical and stEEG features. ROC curve models and pairwise ROC curve comparison were used to evaluate and compare the diagnostic accuracy for TEA detection of EPIAMNE score, presence of symptoms atypical for TGA (pSymAT) and identification of anomalies (interictal epileptiform or temporal focal spiky transients) at stEEG (PosEEG). Area Under the Curve (AUC) of EPIAMNE score revealed to be higher than PosEEG and pSymAT (AUCEPIAMNE = 0.95, AUCpSymAT = 0.85, AUCPosEEG = 0.67) and this superiority proved to be statistically significant (p-valueEPIAMNE-PosEEG and p-valueEPIAMNE-pSymAT < 0.05). In conclusion, EPIAMNE score classified TEA with higher accuracy than PosEEG and pSymAT. This approach could become a promising tool for the differential diagnosis of AAS, especially for early TEA detection.
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Ho, Alexander Thomas, and Laurence Daniel Hurst. "Unusual mammalian usage of TGA stop codons reveals that sequence conservation need not imply purifying selection." PLOS Biology 20, no. 5 (May 12, 2022): e3001588. http://dx.doi.org/10.1371/journal.pbio.3001588.

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The assumption that conservation of sequence implies the action of purifying selection is central to diverse methodologies to infer functional importance. GC-biased gene conversion (gBGC), a meiotic mismatch repair bias strongly favouring GC over AT, can in principle mimic the action of selection, this being thought to be especially important in mammals. As mutation is GC→AT biased, to demonstrate that gBGC does indeed cause false signals requires evidence that an AT-rich residue is selectively optimal compared to its more GC-rich allele, while showing also that the GC-rich alternative is conserved. We propose that mammalian stop codon evolution provides a robust test case. Although in most taxa TAA is the optimal stop codon, TGA is both abundant and conserved in mammalian genomes. We show that this mammalian exceptionalism is well explained by gBGC mimicking purifying selection and that TAA is the selectively optimal codon. Supportive of gBGC, we observe (i) TGA usage trends are consistent at the focal stop codon and elsewhere (in UTR sequences); (ii) that higher TGA usage and higher TAA→TGA substitution rates are predicted by a high recombination rate; and (iii) across species the difference in TAA <-> TGA substitution rates between GC-rich and GC-poor genes is largest in genomes that possess higher between-gene GC variation. TAA optimality is supported both by enrichment in highly expressed genes and trends associated with effective population size. High TGA usage and high TAA→TGA rates in mammals are thus consistent with gBGC’s predicted ability to “drive” deleterious mutations and supports the hypothesis that sequence conservation need not be indicative of purifying selection. A general trend for GC-rich trinucleotides to reside at frequencies far above their mutational equilibrium in high recombining domains supports the generality of these results.
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Dissertations / Theses on the topic "TGA"

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Ruloff, Karl. "Formgebung angiopolarer Zellträger nach dem TGA-Verfahren /." [S.l.] : [s.n.], 2000. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=13893.

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Hoffman, Roland. "Measuring ΔH Using DSC, TGA & DTA." TopSCHOLAR®, 1990. https://digitalcommons.wku.edu/theses/2500.

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The purpose of this study was to obtain greater accuracy in the measurement of the heat of reaction by combining data from various thermal analysis techniques. Conventional equations that calculate heat of reaction are limited because they do not take in to account mass change. Therefore, an enhanced equation was developed to integrate mass (weight) change to provide greater accuracy. The path chosen to implement this new equation employed simultaneous Thermogravimetric / Differential Thermal Analysis (TG/DTA) that could provide both ΔT and weight data simultaneously. Computer programs were written in C and Pascal languages to provide communication capabilities between computers and to calculate heat of reaction using various equations. This included a qualitative to quantitative (ΔT to ΔH) conversion which was performed to the DTA data file to which the enhanced equation was applied. Various samples were used to test and monitor the performance of the developed equations.
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Jerjini, Mehdi. "Etude des propriétés magnétiques des composés TGa avec T." Grenoble 2 : ANRT, 1987. http://catalogue.bnf.fr/ark:/12148/cb37606248c.

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Kuthadi, Sandeep Kumar. "Laboratory Scale Study of Calcium Sulfate Hydration Forms." TopSCHOLAR®, 2014. http://digitalcommons.wku.edu/theses/1467.

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This research is part of an ongoing project to create gypsum wallboards with enhanced fire resistance. The main goal of this research is to better understand the dehydration properties of calcium sulfate dihydrate, and the hydration of calcium sulfate hemihydrate as well as anhydrous calcium sulfate. The lab-scale kinetics of these processes were studied using thermogravimetric analysis and sorption analysis. Scanning electron microscopy (SEM) and X-ray diffraction (XRD) were used to characterize the products from different processes. In addition to the instrumental studies, small batches were handled in ovens and liquid slurries to better mimic the real world processing of these materials. The effects of temperature, time and humidity were investigated to determine their influence on the kinetics of dehydration/hydration of different hydration forms of calcium sulfate.
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Šilhánková, Lenka. "Vývoj metody pro semikvantitativní stanovení mikroplastů v půdách metodou TGA-MS." Master's thesis, Vysoké učení technické v Brně. Fakulta chemická, 2018. http://www.nusl.cz/ntk/nusl-376860.

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Plasty, pronikající do životního prostředí ať už neúmyslně či záměrně, mohou být fragmentovány za vzniku částic v řádu mikrometrů (tzv. mikroplastů) a znečišťovat tak půdní systémy. Doposud vyvinuté analýzy pro stanovení mikroplastů v půdách jsou především zaměřeny na kvalitativní stanovení, nicméně i jejich provedení se zatím stále potýká s různými úskalími. Navíc, téměř všechny tyto analýzy vyžadují časově náročnou předúpravu vzorku. V této studii jsme se zaměřili na vývoj nové analytické metody pro kvantitativní stanovení mikroplastů polyvinylchloridu (PVC) a polystyrenu (PS) v půdách bez předchozí úpravy vzorku pomocí termogravimetrické analýzy spojené s hmotnostní spektrometrií (TGA-MS). Pro analýzu byly použity vzorky modelové půdy s nízkým obsahem organického uhlíku, které byly spikovány na výslednou koncentraci 0,23–7 hm% PVC či PS. Vzorky byly pyrolyzovány s teplotním krokem 5 K min–1 až na teplotu 1000 °C. Pyrolýzní plynné produkty byly následně analyzovány s využitím hmotnostního spektrometru. Získaná data byla normalizována pomocí externího standardu (šťavelan vápenatý). Limity detekce se pohybovaly v rozmezí 0,08–5,3 hm% pro PVC a 0,005–0,7 hm% pro PS v závislosti na zvoleném m/z. Limity kvantifikace pak byly 0,3–17,7 hm% pro PVC a 0,002–2,2 hm% pro PS. Výsledky dokazují, že spojení TGA-MS může být konkurující semikvantitativní metodou pro stanovení mikro-PVC a mikro-PS v půdě s nízkým obsahem organického uhlíku.
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Martin, Brandon Ray. "Pyrolysis and ignition behavior of coal, cattle biomass, and coal/cattle biomass blends." [College Station, Tex. : Texas A&M University, 2006. http://hdl.handle.net/1969.1/ETD-TAMU-1148.

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Ritzka, Yvonne. "Untersuchungen zum Abbrandverhalten von Holz- und Spanplattenproben mit einer TGA-FTIR-Kopplung." [S.l. : s.n.], 1998. http://deposit.ddb.de/cgi-bin/dokserv?idn=955274982.

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Gundogar, Sati Asli. "Thermal Characterization And Kinetics Of Crude Oils By Tga And Dsc Methods." Master's thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/12611502/index.pdf.

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In recent years, the application of thermal analysis to study the combustion and pyrolysis behavior of fossil fuels has gained a wide acceptance because of its significance for industry and economy. In this thesis, the thermal and kinetic analysis of different origin crude oil samples are performed by two well-known thermal analysis techniques: Differential Scanning Calorimetry (DSC) and Thermogravimetry (TG/DTG). The investigation of combustion and pyrolysis behaviors, kinetic analysis of oil samples and the determination of heating rate effect are the main objectives of this study. Six different crude oils from the Southeastern region of Turkey are analyzed throughout the study. All experiments are performed at different heating rates (5, 10 and 15º
C/min) and air is used for combustion and nitrogen for pyrolysis experiments. In combustion experiments, TGA and DSC techniques indicate that the combustion process of crude oils studied is composed of two main reaction regions. These are low-temperature (LTO) and high-temperature oxidation (HTO) regions. In LTO, huge mass loss occurs (from 69 to 87 %) due to high amount of free moisture and volatile hydrocarbons contained in oil samples. Combustion reactions continue up to 900 K. On DSC curves, two exothermic regions of oxidation regimes are detected. Comparing TG/DTG and DSC curves, it can be understood that the mass loss under combustion is accompanied by exothermic peaks because of the oxidative degradation of crude oil components. As in combustion, two distinct reaction regions are revealed under pyrolysis for all samples. The first region indicates distillation and the second one is due to thermal cracking reactions occur at high temperatures and completed up to 840 K. As expected, lighter crude oils have relatively higher amounts of mass loss in distillation region as compared to heavier ones. Besides, residue amount and burn-out temperatures are higher for heavier oils with higher asphaltene content in cracking region. DSC curves for both reactions show endothermic effects. In combustion and pyrolysis experiments, it is noticed that higher heating rates are resulted in higher reaction regions. Distinguishing peaks of samples shift to higher temperatures with an increase in heating rate. Heat of reaction amount under DSC curves is related to asphaltene content and &
#730
API gravity of crude oils. It is deduced that, when &
#730
API gravity of crude oils decreases, the heat value of this reaction increases. The kinetic parameters are evaluated by different kinetic models and mean activation energies (Em) of samples are obtained. At the end, a correlation is established between Em and &
#730
API gravity of oil samples. It is concluded that heavier oils have higher activation energy and Arrhenius constant values for each reaction region. Besides, it is proved that the activation energy is mostly insensitive to the heating rate.
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Corrales, Sanchez Tachmajal Marie. "TGA-MS studies of the pyrolysis of corn stover for charcoal production." Thesis, Massachusetts Institute of Technology, 2016. http://hdl.handle.net/1721.1/105030.

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Thesis: S.B., Massachusetts Institute of Technology, Department of Mechanical Engineering, 2016.
Cataloged from PDF version of thesis.
Includes bibliographical references (pages 61-64).
More than two billion people worldwide rely on wood-based fuels for their daily energy needs, which can produce toxic atmospheric contaminants and cause environmental degradation. MIT D-Lab addresses this challenge with "Fuel from the Fields", a simple technique for making charcoal from agricultural waste. In this work, Themogravimetric analysis combined with online mass spectrometry (TGA-MS) was used to study the pyrolysis of corn agricultural waste with the aim of improving understanding of the carbonization process. Non-isothermal mass loss data from TGA was obtained for three types of corn waste, cobs, husks, and stalks; and used to calculate proximate analysis in terms of moisture, volatile matter, and charcoal content. TGA-MS data for the three materials was used to understand the emissions of H20, CO, H2S and C4H2 as a function of temperature. Activation energy, Ea, and pre-exponential factor, A, were calculated using the first order global single reaction model for corn cobs and husks. TG-DTG data suggested that corn cobs are better suited feedstocks for charcoal production. Mass Spectroscopy was found to successfully characterize emissions. For corn cobs, A = 1.3. 105 s-1 and E, = 88.6 kJ/mol, while for husks A = 5.2. 105 s-1 and Ea = 96.4 kJ/mol. Based on this work, a carbonization burn timeline worksheet was created to aid monitoring of char yield in the field.
by Tachmajal Marie Corrales Sanchez.
S.B.
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Retief, Liezel. "Analysis of vegetable oils, seeds and beans by TGA and NMR spectroscopy." Thesis, Stellenbosch : University of Stellenbosch, 2011. http://hdl.handle.net/10019.1/6831.

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Thesis (PhD (Chemistry and Polymer Science))--University of Stellenbosch, 2011.
ENGLISH ABSTRACT: Due to the commercial, nutritional and health value of vegetable oils, seeds and beans, the analysis of their components is of much interest. In this dissertation oil-containing food products, specifically vegetable oils, seeds and beans, were investigated. Selected minor components of three locally produced vegetable oils, namely apricot kernel, avocado pear and macadamia nut oils were investigated using 31P NMR spectroscopy. These minor components, including 1,2 diacylglycerols, 1,3 diacylglycerols and free fatty acids, were identified in the 31P NMR spectra of each of the three vegetable oils for the first time. Two approaches were used for the quantification of the minor components present in the spectra. A calibration curve approach used known concentrations of standard minor components to establish calibration curves while a direct correlation approach calculated the unknown concentration of minor components in the vegetable oils using a known amount of standard compound within the analysis solution. These approaches aided in determining the concentration of minor components during storage studies in which vegetable oils were stored in five different ways: exposed to light, in a cupboard, in a cupboard wrapped in tin foil, at -8 °C and at 5 °C. It was found that determining the best storage condition for each oil was difficult since individual minor components were affected differently by the various storage conditions. However, in general the best storage conditions appeared to be 5 °C and -8 °C. The oil, protein and carbohydrate contents of sesame, sunflower, poppy, and pumpkin seeds, and soy, mung, black and kidney beans were analysed by thermogravimetric analysis and 13C NMR solid state NMR spectroscopy. It was shown that the first derivative of TGA data for seeds and beans can give valuable information about the carbohydrate, moisture, protein and fat content. This has not been previously demonstrated. For the seeds, the integration of a region between 270–480 ºC was equal to the sum of the oil and protein content and compared well to quantitative results obtained by other conventional methods. For beans the integration of a region between 180-590 ºC, gave a value which represented the sum of the oil, protein and carbohydrate content. 13C solid state NMR spectroscopy, including SPE-MAS, CP-MAS and variable contact time experiments, was carried out on these seeds and beans and gave valuable information on the solid-like and liquid-like components. To our knowledge these seeds and beans have never been previously analysed using this technique. 13C SPE-MAS NMR spectroscopy indicated that the seeds contained more liquid-like components than the beans. In turn the 13C CP-MAS NMR spectra indicated that beans had higher levels of solid-like components than the seeds. These conclusions correlated well with the quantities of liquid-like components and solid-like components that were determined by conventional methods and TGA. Preliminary studies using T1pH experiments on the components present in the seeds and beans led to a few observations. Most interesting is that a model using a two- phase fit in order to determine T1pH values appears to be more accurate than a one-phase model.
AFRIKAANSE OPSOMMING: Groente olies, sade en bone is ‘n onderwerp van groot belang omrede hul kommersiële, voeding en gesondheidswaardes. In hierdie tesis is olie-bevattende voedselprodukte, spesifiek groente-olies, sade en bone geanaliseer. Geselekteerde komponente teenwoordig in klein hoeveelhede in drie lokaal geproduseerde groente-olies, naamlik appelkoos-pit, avokadopeer en makadamia-neut olies is geanaliseer met behulp van 31P KMR spektroskopie. Hierdie komponente, insluitend 1,2 diasielglyserole, 1,3 diasielglyserole en ongebonde vetsure, is vir die eerste keer geïdentifiseer in die 31P KMR spektra van die drie groente olies. Twee benaderings is gebruik vir die hoeveelheids-bepaling van die komponente in die spektra. ‘n Yking-kurwe metode het gebruik gemaak van bekende hoeveelhede konsentrasies standaard komponente vir die opstel van yking-kurwes, terwyl ‘n direkte korrelasie metode gebruik is om die onbekende konsentrasie van komponente in groente olies te bepaal met behulp van ‘n bekende hoeveelheid standaard verbinding teenwoordig in die oplossing. Hierdie metodes het gelei tot die bepaling van die konsentrasies van die komponente gedurende vyf verskillende berging toestande wat ingesluit het: Blootgestel aan lig, in ‘n donker kas, in ‘n donker kas toegevou in tin foelie, bevries by -8 °C en in ’n koelkas by 5 °C. Dit was bevind dat bepaling van die beste bergingstoestand vir elke olie moeilik is aangesien die individuele komponente verskillend geaffekteer word deur die verskeie berging toestande. Die beste bergings toestand oor die algemeen blyk egter om by 5 °C en -8 °C te wees. Sesamsaad, sonneblomsaad, papawersaad en pampoensaad sowel as sojaboontjie, mungboontjie, swartboontjie en pronkboontjie se olie, protein en koolhidraat komponente was geanaliseer met behulp van termogravimetriese analise (TGA) en 13C soliede toestand KMR spektroskopie. Dit was bevind dat die eerste afgeleide van die TGA data waardevolle inligting lewer oor die komponent inhoud van elk van die sade en bone. Hierdie is nog nie vantevore bevind nie. Vir die sade, was die integrasie van ‘n area tussen 270–480 ºC gelyk aan die som van die olie en proteïen inhoud en het goed vergelyk met die waardes verky deur algemene analitiese metodes. Vir die boontjies, was die integrasie van ‘n area tussen 180-590 ºC gelyk aan die som van die olie, protein en koolhidraat inhoud. 13C vaste staat KMR spektroskopie, insluitende SPE-MAS, CP-MAS en variëerbare kontak-tyd eksperimente, was gedoen en het waardevolle inligting gelewer omtrent die solied-agtige en mobiel-agtige komponente. Hierdie sade en bone is tot ons kennis nog nie van te vore met die tegnieke ondersoek nie. 13C SPE-MAS NMR spektroskopie het aangedui dat daar ‘n groter hoeveelheid mobiel-agtige komponente in sade as in bone teenwoordig is. 13C CP-MAS NMR spektroskopie het weer aangedui dat daar ‘n groter hoeveelheid solied-agtige komponente in bone as in sade teenwoordig is. Hierdie gevolgtrekkings het goed vergelyk met die waarnemings verkry deur konvensionele analitiese metodes en TGA. Voorlopige studies op die komponente van sade en bone deur T1pH eksperimente het tot ‘n paar gevolgtrekkings gelei waarvan die mees interessantste was dat ‘n twee-fase model vir die bepaling van T1pH waardes beter resultate lewer as ‘n een-fase model.
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Books on the topic "TGA"

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Alahyane, Ayad. Tga tguri tislit ig as iḍ imilcil: Timdyazin. Ait Melloul: Centre imprimerie, 2011.

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Andersson, Rune. Fo rluster av kva ve och fosfor fra n a kermark i Sverige: Omfattning, orsaker och fo rslag till a tga rder = Losses of nitrogen and phosphorus from arable land in Sweden : magnitude, regulating factors, and measures proposed. Uppsala: Sveriges lantbruksuniversitet, 1986.

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Monika, Machnicki, Schierz Kai Uwe, Bauermeister Volker 1949-, Kunstverein Ulm, Kunsthalle Erfurt, and Kunstverein Münsterland, eds. Peter Dreher: Tag um Tag guter Tag. Freiburg im Breisgau: Modo, 2008.

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Vulbeau, Alain. Du tag au tag. Paris: Desclée de Brouwer, 1992.

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Tea and tea drinking. Oxford: Shire Publicatiions, 2010.

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Reade, Arthur. Tea and tea drinking. London: Attic Discoveries, 1986.

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Tag, Steinfaust, Maulschelle Tag: Gedichte. Zürich: Ammann, 1986.

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Agnew, Antonia. Tea, trade and tea canisters. London: Stockspring Antiques, 2002.

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Brewing tea: Appreciating Chinese tea. Beijing Shi: China Intercontinental Press, 2010.

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Kati tha ginei, tha deis. Athēna: Ekdoseis Polis, 2010.

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Book chapters on the topic "TGA"

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Gooch, Jan W. "TGA." In Encyclopedic Dictionary of Polymers, 740. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_11731.

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Raj, Satish R., S. R. Wayne Chen, Robert S. Sheldon, Arti N. Shah, Bharat K. Kantharia, Ulrich Salzer, Bodo Grimbacher, et al. "TGA." In Encyclopedia of Molecular Mechanisms of Disease, 2041. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-540-29676-8_7047.

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Fedelich, Nicolas. "TGA-MS." In Evolved Gas Analysis, 9–17. München: Carl Hanser Verlag GmbH & Co. KG, 2019. http://dx.doi.org/10.3139/9781569908105.002.

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Fedelich, Nicolas. "TGA-FTIR." In Evolved Gas Analysis, 18–30. München: Carl Hanser Verlag GmbH & Co. KG, 2019. http://dx.doi.org/10.3139/9781569908105.003.

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Metze, Dieter, Tam Nguyen, Birgit Haack, Alexander K. C. Leung, Noriko Miyake, Naomichi Matsumoto, A. J. Larner, et al. "D-TGA." In Encyclopedia of Molecular Mechanisms of Disease, 519–20. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-540-29676-8_7048.

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Fedelich, Nicolas. "TGA-FTIR." In Evolved Gas Analysis, 18–30. München, Germany: Carl Hanser Verlag GmbH & Co. KG, 2019. http://dx.doi.org/10.1007/978-1-56990-810-5_3.

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Fedelich, Nicolas. "TGA - MS." In Evolved Gas Analysis, 9–17. München, Germany: Carl Hanser Verlag GmbH & Co. KG, 2019. http://dx.doi.org/10.1007/978-1-56990-810-5_2.

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Li, Shoujun, and Kai Ma. "TGA-IVS and TGA-VSD Seen Late." In Surgery of Conotruncal Anomalies, 283–302. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-23057-3_16.

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Weise, Kira. "Thermogravimetrische Analyse (TGA)." In Die Reaktivität von Hüttensand als Betonzusatzstoff, 93–135. Wiesbaden: Springer Fachmedien Wiesbaden, 2017. http://dx.doi.org/10.1007/978-3-658-20492-1_8.

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Larner, A. J. "History of TGA." In Transient Global Amnesia, 1–8. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-54476-2_1.

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Conference papers on the topic "TGA"

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Zhang, Yuqiao, Pinchen Cui, Ziqi Zhou, and Ujjwal Guin. "TGA." In the 3rd ACM Workshop. New York, New York, USA: ACM Press, 2019. http://dx.doi.org/10.1145/3338508.3359576.

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Charbonneau, Laurence, Rasheda Arman Chowdhury, Bohdana Marandyuk, Rong Wu, Nancy Poirier, Joaquim Miró, Anne-Monique Nuyt, Marie-Josée Raboisson, and Mathieu Dehaes. "Brain hemodynamics and oxygen metabolism in neonates with transposition of the great arteries." In Optics and the Brain. Washington, D.C.: Optica Publishing Group, 2023. http://dx.doi.org/10.1364/brain.2023.btu3b.3.

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A ventricular septal defect (VSD) may be a risk factor for brain development in transposition of the great arteries (TGA). Brain hemodynamics and oxygen metabolism assessed by optical monitoring in TGA&VSD were compared to controls.
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Ibrahim, Mohamed S., Alka Gupta, Dave Gage, Justin A. Zeamer, and Ryoichi S. Amano. "Chicken Manure Pyrolysis Using Carbon Dioxide." In ASME 2014 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/detc2014-35664.

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The design and build of a Thermo-gravimetric analyzer (TGA) is discussed in this paper along with the preliminary data obtained. The TGA was designed for biomass pyrolysis and gasification. In the design it was taken in consideration decreasing the size as possible so as to decrease the area subject to heat losses as possible and to be capable of reaching high temperatures sufficient for both pyrolysis and gasification. The TGA was then tested using carbon dioxide and calculations for the rate of mass converted and conversion rate were carried out.
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Mittleman, M. L., and D. A. C. Compton. "Industrial Applications for TGA/FT-IR." In 1985 International Conference on Fourier and Computerized Infrared Spectroscopy, edited by David G. Cameron and Jeannette G. Grasselli. SPIE, 1985. http://dx.doi.org/10.1117/12.970768.

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Bharti, Shivani, Satvinder Singh, Shikshita Jain, Gurvir Kaur, Shikha Gupta, and S. K. Tripathi. "Interaction of TGA with CdSe nanoparticles." In 2ND INTERNATIONAL CONFERENCE ON CONDENSED MATTER AND APPLIED PHYSICS (ICC 2017). Author(s), 2018. http://dx.doi.org/10.1063/1.5032492.

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Hoyos, Catalina Gómez, and Analia Vazquez. "Carbon Dioxide Sequestration in Portland Cement Paste Modified With Cellulose Microcrystalline." In ASME 2013 32nd International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/omae2013-11528.

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This work evaluated the dynamical mechanical properties of Portland cement paste modified with cellulose microcrystalline (MCC) before and after exposition to CO2 saturated environment during 4 h. All the cement paste samples were subjected to thermogravimetrical analysis (TGA) before and after carbonation process. Changes in morphology of the samples were studied in a field emission electron microscope (FE-SEM); additionally changes generated in hydration kinetic by the addition of MCC to cement paste, were followed by measuring the adiabatic temperature during the first 24 h of reaction. The addition of MCC delayed the hydration reaction. TGA results shown that cement past with MCC was carbonated. The carbonation process in TGA was evaluated by the increase in the size of the peak around 680 oC related with calcium carbonate thermal degradation. The dynamical mechanical analysis shown that, cement paste with MCC increased significantly its storage modulus after CO2 exposition.
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Mace, D. A. H., M. J. Adams, J. Singh, M. A. Fisher, and ID Henning. "Twin-Guide Laser Amplifier Switch With Spatially Separated Output." In Optical Amplifiers and Their Applications. Washington, D.C.: Optica Publishing Group, 1990. http://dx.doi.org/10.1364/oaa.1990.wc1.

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Optical switches incorporating laser amplifiers are very attractive because the amplifier gain can be used to compensate for the switch insertion loss[1]. Using a twin-guide amplifier (TGA) with two closely spaced parallel semiconductor laser amplifiers, we reported the first demonstration of optical crosspoint switching with gain[2]. We report here measurements on a TGA which also has curved active guides, enabling the device to be connected to three optical fibres simultaneously and used as 1×2 optical switch.
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Park, Chan Young, Young Woo Rhee, Moon Hee Han, and Si Hyun Lee. "TGA Study on Catalytic Gasification of Lignite." In 14th Asia Pacific Confederation of Chemical Engineering Congress. Singapore: Research Publishing Services, 2012. http://dx.doi.org/10.3850/978-981-07-1445-1_248.

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Mayor, J. Rhett, and Alexander Williams. "Experimentally Derived Arrhenius Coefficients for the Reaction Modeling of Fast Pyrolysis." In ASME 2010 4th International Conference on Energy Sustainability. ASMEDC, 2010. http://dx.doi.org/10.1115/es2010-90226.

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The search for fossil fuel alternatives has been one of increasing interest in recent years and one method which shows evidence of feasibility on a large scale is the production of bio-oil through the pyrolysis of biomass. In order to mathematically characterize biomass pyrolysis reactions for the purpose of process modeling, reaction descriptors in the form of Arrhenius coefficients are frequently utilized. Due to the complexity and inhomogeneity of biomass molecular structures, strictly analytically derived Arrhenius coefficients are not capable of predicting pyrolysis behaviors and outcomes. Typically thermogravimetric analysis (TGA) is employed as a method of extracting mass conversion data as a function of temperature from which bulk reaction descriptors following the form of Arrhenius reaction coefficients are derived. The preceding time and temperature history, however, will have a significant impact on the biomass conversion processes at each subsequent data point. This renders derived process predictors from TGA incapable of approximating fast pyrolysis reactions which have a markedly different time and temperature history than is seen utilizing TGA methods. Experimentally derived reaction descriptors of the Arrhenius form for the fast pyrolysis of biomass have been investigated utilizing a novel isothermal fast pyrolysis reactor. Multiple reaction durations and reaction temperatures for Pinus Taeda were tested resulting in measurements of biomass conversion. Reaction coefficients derived from the data are compared to coefficients derived utilizing TGA data and their predictions for mass conversion are contrasted.
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Jayadas, N. H., K. Prabhakaran Nair, and G. Ajithkumar. "Vegetable Oils as Base Oil for Industrial Lubricants: Evaluation Oxidative and Low Temperature Properties Using TGA, DTA and DSC." In World Tribology Congress III. ASMEDC, 2005. http://dx.doi.org/10.1115/wtc2005-63893.

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In this paper oxidative degradation of saturated and unsaturated vegetable oils is studied by thermo gravimetric analysis (TGA) and differential thermal analysis (DTA) and their low temperature properties are studied by differential scanning calorimetry (DSC). Both non-isothermal and isothermal thermo gravimetric analysis procedures are used for the study. The onset temperatures of oxidative degradation and weight gain in isothermal TGA are taken as measures of oxidative and thermal stabilities. Three vegetable oils namely coconut oil, sesame oil and sunflower oil with varying degree of un-saturation are selected for the study. The results are found to agree with reported results obtained by conventional methods. Several standard methods are currently available for determining the oxidative and low temperature properties of base oils. These methods are extremely time-consuming and data reproducibility between laboratories is poor. TGA, DTA and DSC are excellent tools to evaluate base oils in respect of their oxidative and low temperature behavior in that they produce results quickly, reproducibly and the sample requirement is very low.
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Reports on the topic "TGA"

1

Stern, Seymour, and Douglas Dierdorf. Thermogravimetric Analysis (TGA) of Various Epoxy Composite Formulations. Fort Belvoir, VA: Defense Technical Information Center, August 2005. http://dx.doi.org/10.21236/ada439837.

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Coker, Eric, Sarah Scott, and Alexander Brown. Pyrolysis Modeling of PMMA decomposition studied by TGA. Office of Scientific and Technical Information (OSTI), February 2021. http://dx.doi.org/10.2172/1768703.

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Mazumder, J., A. Kar, S. Sircar, C. Ribaudo, and R. Subramanian. Thermal Analysis System (DSC, TGA, TMA) for Oxidation and Phase Transformation Studies of Alloys with Mestable Phase. Fort Belvoir, VA: Defense Technical Information Center, June 1988. http://dx.doi.org/10.21236/ada198420.

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Parkison, Adam, and Andrew Nelson. Hydrogen Measurement during Steam Oxidation Using Coupled TGA and QMS. Office of Scientific and Technical Information (OSTI), December 2014. http://dx.doi.org/10.2172/1164765.

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Korinko, P., and K. Imrich. EVALUATION OF TGA AS A QUALITY ASSURANCE TOOL FOR SURFACEMODIFIED ZIRCOLOY-4. Office of Scientific and Technical Information (OSTI), September 2009. http://dx.doi.org/10.2172/965396.

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Hong, Seok H., Kenneth B. Sumpter, Wendel J. Shuely, and Robert G. Nickol. Evaporation of HD Droplets From Nonporous, Inert Surfaces in TGA Microbalance Wind Tunnels. Fort Belvoir, VA: Defense Technical Information Center, September 2008. http://dx.doi.org/10.21236/ada491474.

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Nadler, Melvin P. Thermal Degradation Study of IM7/DMBZ-15 High Temperature Composite by TGA/FTIR. Fort Belvoir, VA: Defense Technical Information Center, September 2003. http://dx.doi.org/10.21236/ada420247.

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Wayne, David. Interaction of Concentrated (68%) Aqueous Nitric Acid Solutions with Cheesecloth: A TGA-DSC-MS Study. Office of Scientific and Technical Information (OSTI), January 2023. http://dx.doi.org/10.2172/1908467.

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Cordaro, Joseph, Alan Kruizenga, and April Nissen. Thermal characterization and model free kinetics of aged epoxies and foams using TGA and DSC methods. Office of Scientific and Technical Information (OSTI), October 2013. http://dx.doi.org/10.2172/1104770.

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Yang, Dali, Alexander Edgar, Joseph Torres, and Jillian O'Neel. A Progress Report for a 44-month Aging Study on Nitroplasticizer (NP) Stability - Summary of KF and TGA Results. Office of Scientific and Technical Information (OSTI), June 2023. http://dx.doi.org/10.2172/1983850.

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