Wyniki wyszukiwania - BazTech

1

Zastosowanie mikrospektroskopii absorpcyjnej w podczerwieni oraz modelu regresji liniowej do analizy ex vivo struktur drugorzędowych białek w tkankach zwierzęcych

Majzner Katarzyna, Wróbel Tomasz, Barańska Małgorzata

Studia i Materiały Informatyki Stosowanej

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2013

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nr 11

29--36

PL

Mikrospektroskopia FT-IR w połączeniu z chemometrią jest jedną z najważniejszych współczesnych technik analitycznych wykorzystywanych w badaniach materiałów biologicznych, takich jak tkanki czy komórki. Pozwala ona na identyfikację oraz badanie przestrzennej dystrybucji składników biochemicznych w badanym materiale, zapewniając jednocześnie wysoki poziom selektywności i rozdzielczości. Chemometria, wykorzystująca metody komputerowe, statystyczne oraz matematyczne w analizowaniu danych chemicznych, stanowi potężne narzędzie w badaniu tkanek zwierzęcych w celu obserwowania zmian chorobowych. W niniejszej pracy przedstawiono zastosowanie modelu regresji liniowej oraz spektroskopii absorpcyjnej w podczerwieni (FT-IR) do analizy zmian w profilu biochemicznym tkanki wywołanych przez chorobę cukrzycową..

EN

FT-IR microspectroscopy in combination with chemometrisc is one of the most important modern analytical techniques used in studying biological materials, such as tissues or cells. It allows for identification and studying the spatial distribution of biochemical components in the sample while providing a high level of selectivity and resolution. Chemometrics, which is based on computational, statistical and mathematical methods to analyze chemical data, is a powerful tool in the study of animal tissues and observing the lesions. This paper presents an application of a linear regression model and infrared absorption spectroscopy (FT-IR) to analyze of changes in the biochemical profile of tissue caused by diabetic disease.

2

Specjacja i modelowanie transportu metali ciężkich w glebach

Kowalkowski T., Buszewski B.

Ekologia i Technika

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2002

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R. 10, nr 1

3-11

EN

Soils and groundwaters have been extensively exposed to pollution by heavy metals from various anthropogenic sources. The occurrence of these metals in soils represents a significant environmental hazard and one of the most difficult contamination problems to solve. The study of migration of heavy metals in soils requires the knowledge of complexation types between soil constituents and metals (organometallic complexation, inorganic complexes, precipitated forms etc.) and a lot of information about the soil (ionic strength, pH , content of organic matter, concentration of aluminosilicates, presence of various anions, size of particles, redox potential, charge of surface, composition of soil solution etc.). in all environmental systems including, soils, toxicity and/or properties of heavy metals do not correlate with total metal concentration, but rather with the content of some specific complex constituents. Therefore , no information on total concentration of heavy metals is necessary. Advances of speciation analysis should be considered instead continued to understand. The impact of heavy metals to soil ecosystems. This is one of the most important driving forces of developing new analytical procedures for extraction, identification and quantification of heavy metals and speciation techniques. The number of imperative data is so high that many scientists use mathematical and computer modelling to cope with understanding processes occurring in soils. A number of models have been developed allowing predicting quantitatively the movements and sorption of heavy metals in soil with good accuracy. However, the investigations for determining chemical properties of soil, heavy metals interactions, should be continued because a lot of questions about this strongly heterogenic matrix are still not answered.

3

Chemometric characterization studies of marbles by atomic absorption spectrometry

Akçay H., Demir C., Özer U., Güçer Ş.

Chemia Analityczna

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1999

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Vol. 44, No. 3B

577-589

EN

A method is proposed for the characterisation of marble samples used in historical build-ings in Bursa, Turkey. Determination of heavy metals such as Cu, Pb, Ag, Ni, Mn, Cd, Zn, Fe, Co and Mg in original marbles have been carried out by atomic absorption spectro-photometer, and Na and K by atomic emission spectrophotometer. Information about geographical origin is often required of marble samples. In order to obtain such information, principaI component analysis, correlation analysis and cIuster analysis techniques can be used as valid tools for processing series of data from chemical analysis. The techniques were applied to the raw and standardised data, showing different clusters related to the origin of marble sampIes. Some predictions about the origin of samples are made and showing the potential of chemometric techniques and their possible contribution to the characterisation of marbles used in historical buildings.

PL

Analiza głównego czynnika, analiza korelacyjna i analiza kIasterów zostały wykorzystane do badania podobieństw chemicznych marmurów z różnych starożytnych budyn-ków w Turcji. Danymi do utworzenia odpowiednich matryc były wyniki oznaczeń Cu, Pb, Ag, Ni, Mn, Cd, Zn, F e iCo metodą AAS oraz Na i K metodą AES w próbkach marmurów. Przeprowadzona analiza chemometryczna pozwolił a na określenie miejsc pochodzenia marmuów.