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Bachmann, S.
University of Innsbruck (Austria)2009
University of Innsbruck (Austria)2009
AbstractAbstract
[en] Capillary electrophoresis (CE) offers the advantage of flexibility and method development. It excels in the area of separation of ions, chiral, polar, and biological compounds (especially proteins and peptides). Masking the active sites on the inner surface of a bare fused-silica capillary wall is often necessary for CE separations of basic compounds, proteins and peptides. The use of capillary surface coatings is an approach to prevent adsorption phenomena and improve the repeatability of these analytes. In this work, new capillary coatings consisting of (I) derivatized polystyrene nanoparticles (PS) and (II) derivatized fullerenes, were investigated for the analysis of peptides and protein digest by CE. The coated capillaries showed excellent run-to-run and batch-to-batch reproducibility (RSD of migration time ≤ 0.5 % for run to run and ≤ 9.5 % for batch-to-batch experiments). Furthermore, the capillaries offer high stability from pH 2.0 up to pH 10.0. The actual potential of the coated capillaries was tested by combining CE with matrix-assisted laser desorption ionisation (MALDI) mass spectrometry (MS) for analysing complex samples, such as peptides, whereas the overall performance of the CE-MALDI-TOF-MS system was investigated by analysing a five protein digest mixture. Subsequently, the peak list (peptide mass fingerprint) generated from the mass spectra of each fraction was entered into the Swiss Prot database in order to search for matching tryptic fragments using the Mascot software. The sequence coverage of analysed proteins was between 36-68%. The established technology benefits from the synergism of high separation efficiency and the structure selective identification via MS. (author)
[de]
Die Kapillarelektrophorese (CE) ist eine Hochleistungstrenntechnik (high performance capillary electrophoresis, HPCE) und ist neben der Hochleistungs-Fluessigkeitschromatographie (HPLC) eine haeufig eingesetzte Trennmethode in der Analytik. Fuer die Analyse von Biomolekuelen wie z.B. Peptiden und Proteinen stellt die CE eine wertvolle Ergaenzung der klassischen elektrophoretischen Methoden dar, die sich durch hohe Trenneffizienz, gute Automatisierbarkeit und breite Adaptierbarkeit der Trennbedingungen auszeichnet. Ein Teil der vorliegenden Arbeit bestand darin, neue oberflaechenmodifizierte Kapillaren zu entwickeln, die sich zur Trennung von Biomolekuelen mittels CE eignen. Peptide und Proteine tendieren dazu, an der Kapillarwand zu absorbieren. Um diesen stoerenden Effekt zu unterbinden, wird die Innenoberflaeche der Kapillare derivatisiert und somit die Effizienz, die Empfindlichkeit und die Reproduzierbarkeit der kapillarelektrophoretischen Trennung erhoeht. Die Beschichtung der Kapillaren erfolgte durch kovalente Bindung zweier unterschiedlicher Nanopartikel (I) Latex Diol und (II) C60-Fullerenol. Die ueberpruefung der Beschichtung der Kapillaren erfolgte durch Messen des EOF und durch Messen der Kapillare mittels NIR-Imaging. Weiters wurden die Kapillaren auf Stabilitaet der Beschichtung, Trennleistung und Reproduzierbarkeit ueberprueft. Die Beschichtungen der beiden mit Nanomaterialien beschichteten Kapillaren zeigen eine hohe Stabilitaet und hohe Lauf zu Lauf und Batch zu Batch Reproduzierbarkeiten fuer saure und basische pH-Werte des Trennelektrolyten. Beide Kapillaren zeigten eine gute relative Standardabweichung (RSD) der Migrationszeiten von <= 0.5% fuer die Lauf zu Lauf und <= 9.5% fuer die Batch zu Batch Reproduzierbarkeit. Weiters zeigten die Kapillaren hohe Stabilitaet im pH Bereich des Trennelektrolyten von pH 2.0 bis 10.0. Die Leistungsfaehigkeit der beschichteten Kapillaren (Fullerenol und Latex Diol) fuer die Trennung von Peptiden wurde durch Trennen eines tryptisch verdauten Proteins, dem [alpha]-Casein, demonstriert. (author)Original Title
Entwicklung Neuer Oberflaechenmodifizierter Kapillaren fuer die Kapillarelektrophorese und anschliessender Kopplung mit der Massenspektrometrie
Primary Subject
Source
2009; 230 p; Available from the library of the University of Innsbruck, Innrain 50, 6020 Innsbruck, Austria; Thesis (Ph.D.)
Record Type
Miscellaneous
Literature Type
Thesis/Dissertation
Country of publication
BLOOD VESSELS, BODY, CARBON, CARDIOVASCULAR SYSTEM, COMPUTER CODES, ELEMENTS, IONIZATION, MATERIALS, NONMETALS, ORGANIC COMPOUNDS, ORGANIC POLYMERS, ORGANS, PETROCHEMICALS, PETROLEUM PRODUCTS, PLASTICS, POLYMERS, POLYOLEFINS, POLYVINYLS, PROTEINS, SORPTION, SPECTRA, SPECTROSCOPY, SYNTHETIC MATERIALS
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Bachmann, S. J.
Vienna University of Technology (Austria)2020
Vienna University of Technology (Austria)2020
AbstractAbstract
No abstract available
Primary Subject
Source
2020; 162 p; Available from Vienna University of Technology Library, Resselgasse 4, 1040 Vienna (AT) and available from https://permalink.obvsg.at/AC16117819; Thesis (Ph.D.)
Record Type
Miscellaneous
Literature Type
Thesis/Dissertation
Country of publication
Reference NumberReference Number
INIS VolumeINIS Volume
INIS IssueINIS Issue
External URLExternal URL
AbstractAbstract
[en] Micro-strip gas chambers have excellent localization properties, high rate capability and good granularity, and have been adopted for may experimental set-ups. Two recurrent problems however have been reported: slow degradation under sustained irradiation, and damaging accidental discharges. New breeds of detectors aim at improving on these crucial points; CAT, micromegas, gas electron multiplier are examples. Very performing, they are more robust and reliable. Two-stage devices, making use of a gas electron multiplier as first element, permit to sustain larger gains in presence of high rates and heavily ionizing tracks
Primary Subject
Secondary Subject
Source
S0375947499007721; Country of input: International Atomic Energy Agency (IAEA); Copyright (c) 2000 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.
Record Type
Journal Article
Journal
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AbstractAbstract
No abstract available
Original Title
GEM-Detektoren fuer COMPASS
Primary Subject
Source
2001 spring meeting of Fachverbaende Gravitation und Relativitaetstheorie (GR), Teilchenphysik (T), and Theoretische und Mathematische Grundlagen der Physik (MP) of Deutsche Physikalische Gesellschaft e.V. (DPG) with physics and book exhibition; Fruehjahrstagung 2001 der Fachverbaende Gravitation und Relativitaetstheorie (GR), Teilchenphysik (T), und Theoretische und Mathematische Grundlagen der Physik (MP) der Deutschen Physikalischen Gesellschaft e.V. (DPG) mit Physik- und Buchausstellung; Bonn (Germany); 26-30 Mar 2001
Record Type
Journal Article
Literature Type
Conference
Journal
Verhandlungen der Deutschen Physikalischen Gesellschaft; ISSN 0420-0195; ; CODEN VDPEAZ; v. 36(3); p. 42-43
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Reference NumberReference Number
INIS VolumeINIS Volume
INIS IssueINIS Issue
AbstractAbstract
No abstract available
Original Title
Roentgenbildgebung mit Multi-GEM Detektoren
Primary Subject
Source
2001 spring meeting of Fachverbaende Gravitation und Relativitaetstheorie (GR), Teilchenphysik (T), and Theoretische und Mathematische Grundlagen der Physik (MP) of Deutsche Physikalische Gesellschaft e.V. (DPG) with physics and book exhibition; Fruehjahrstagung 2001 der Fachverbaende Gravitation und Relativitaetstheorie (GR), Teilchenphysik (T), und Theoretische und Mathematische Grundlagen der Physik (MP) der Deutschen Physikalischen Gesellschaft e.V. (DPG) mit Physik- und Buchausstellung; Bonn (Germany); 26-30 Mar 2001
Record Type
Journal Article
Literature Type
Conference
Journal
Verhandlungen der Deutschen Physikalischen Gesellschaft; ISSN 0420-0195; ; CODEN VDPEAZ; v. 36(3); p. 43
Country of publication
Reference NumberReference Number
INIS VolumeINIS Volume
INIS IssueINIS Issue
Immobilization of enzymes on radiation-modified gelatine gel by using a chemical cross-linking agent
AbstractAbstract
[en] Investigations into the effect of ionizing radiation on the gelatine gels have shown that water-insoluble gel can be formed under suitable irradiation conditions. To establish the optimal conditions for the processing of the insoluble gel, the yield of cross-linking has been determined for gelatine solutions and its gels irradiated with various doses in the absence and in the presence of oxygen. Glucose isomerase (GI) was used as a test enzyme for immobilization on the gelatine gel. This enzyme which catalyses the isomerization of glucose to fructose has been used on the commercial-scale production of high fructose syrups. The support matrix chosen for the enzyme immobilization has been obtained by irradiating 4% wt/vol. de-aerated gelatine gel at a dose of 1.5 x 104 kGy at 150C. Actinoplanes missouriensis cells containing GI were mixed with gelatine gel particles and cross-linked with glutaraldehyde. It was found that the immobilized GI can be successfully applied in the continuous isomerization of glucose to fructose. (author)
Primary Subject
Source
International Atomic Energy Agency, Vienna (Austria); Food and Agriculture Organization of the United Nations, Rome (Italy); Proceedings series; 479 p; ISBN 92-0-110081-7; ; 1981; p. 245-251; IAEA; Vienna; International symposium on combination processes in food irradiation; Colombo, Sri Lanka; 24 - 28 Nov 1980; IAEA-SM--250/18
Record Type
Book
Literature Type
Conference; Numerical Data
Country of publication
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AbstractAbstract
[en] Several properties of Actinoplanes missouriensis and Streptomyces olivaceus glucose isomerase have been studied after irradiation the enzyme of the dose of 10 kGy in dry state. The temperature at which the Actinoplanes missouriensis cells show the highest activity decreased by at least five centigrades. Other investigated enzymatic properties have been found to show no significant differences after irradiation. (orig.)
[de]
Verschiedene Eigenschaften von in trockenem Zustand mit 10 kGy bestrahlter Glucoseisomerase von Actinoplanes missouriensis und Streptomyces olivaceus wurden untersucht. Die Temperatur, bei welcher die Actinoplanes missourienses-Zellen die hoechste Aktivitaet zeigen, wurde um min. 50C erniedrigt. Die uebrigen untersuchten Enzymeigenschaften wurden durch die Bestrahlung nur geringfuegig veraendert. (orig.)Primary Subject
Source
Record Type
Journal Article
Journal
Starch/Staerke; ISSN 0038-9056; ; v. 36(6); p. 212-214
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AbstractAbstract
No abstract available
Original Title
Wplyw promieniowania gamma 60Co na niektore wlasnosci katalazy
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Journal Article
Journal
Nukleonika; v. 18 p. 369-374
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AbstractAbstract
[en] The influence of ionizing radiation on the patulin content of apple juice concentrate was investigated. The results indicated that patulin, at an initial concentration of about 2 mg/kg, disappeared after irradiation of the concentrate with doses as low as 2.5 kGy. For lower doses, the extent of patulin degradation was proportional to the absorbed dose. Irradiation of the concentrate with doses sufficient for patulin disappearance did not change the titratable acidity, the content of reducing sugars and carbonyl compounds or the amino acid composition. The content of ascorbic acid slightly decreased and the colour of the concentrate brightened. The intensity of the patulin absorption spectra after irradiation of mycotoxin in aqueous solutions decreased. (orig.)
[de]
Es wurde der Einfluss von ionisierenden Strahlen auf das Apfelsaftkonzentrat untersucht. Die Ergebnisse haben gezeigt, dass Patulin bei einer Anfangskonzentration von etwa 2 mg/kg nach der Bestrahlung des Konzentrates mit Dosen niedriger als 2.5 kGy verschwindet. Bei kleineren Dosen war der Patulinabbau proportional zur Strahlendosis. Die Bestrahlung des Konzentrates mit einer Dosis, ausreichend fuer den Patulinabbau, veraenderte die Titrationsaciditaet, den Gehalt an reduzierenden Zuckern und Carbonylverbindungen und die Zusammensetzung der Aminosaeuren nicht. Der Gehalt an Ascorbinsaeure verminderte sich ein wenig und die Faerbung des Konzentrates hellte sich auf. Die Intensitaet der Absorptionsspektren sank nach der Bestrahlung von Patulin in waessrigen Loesungen. (orig.)Primary Subject
Secondary Subject
Record Type
Journal Article
Journal
Zeitschrift fuer Lebensmittel-Untersuchung und -Forschung; ISSN 0044-3026; ; CODEN ZLUFA; v. 187(3); p. 235-238
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AbstractAbstract
No abstract available
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Record Type
Journal Article
Journal
Studia Biophysica; v. 39(3); p. 231-236
Country of publication
BETA DECAY RADIOISOTOPES, BETA-MINUS DECAY RADIOISOTOPES, CARBOXYLIC ACIDS, CHALCOGENIDES, COBALT ISOTOPES, ELECTROMAGNETIC RADIATION, HETEROCYCLIC ACIDS, HETEROCYCLIC COMPOUNDS, INTERMEDIATE MASS NUCLEI, IONIZING RADIATIONS, ISOMERIC TRANSITION ISOTOPES, ISOTOPES, MAGNETIC RESONANCE, MINUTES LIVING RADIOISOTOPES, NITROGEN COMPOUNDS, NUCLEI, ODD-ODD NUCLEI, ORGANIC ACIDS, ORGANIC COMPOUNDS, ORGANIC NITROGEN COMPOUNDS, OXIDES, OXYGEN COMPOUNDS, PIGMENTS, PORPHYRINS, PROTEINS, RADIATION EFFECTS, RADIATIONS, RADIOISOTOPES, RESONANCE, SPECTRA, YEARS LIVING RADIOISOTOPES
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