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Query: "author" (Cvelbar Ta��ja) .

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1.
Dopolnilno obsevanje raka dojk
Tanja Marinko, 2023, published professional conference contribution

Keywords: rak dojk, obsevanje raka, radioterapija
Published in DiRROS: 08.01.2024; Views: 138; Downloads: 35
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Hydrothermal synthesis of rare-earth modified titania : influence on phase composition, optical properties, and photocatalytic activity
Nejc Rozman, David Maria Tobaldi, Uroš Cvelbar, Harinarayanan Puliyalil, Joao Antonio Labrincha, Andraž Legat, Andrijana Sever Škapin, 2019, original scientific article

Abstract: In order to expand the use of titania indoor as well as to increase its overall performance, narrowing the band gap is one of the possibilities to achieve this. Modifying with rare earths (REs) has been relatively unexplored, especially the modification of rutile with rare earth cations. The aim of this study was to find the influence of the modification of TiO2 with rare earths on its structural, optical, morphological, and photocatalytic properties. Titania was synthesized using TiOSO4 as the source of titanium via hydrothermal synthesis procedure at low temperature (200 °C) and modified with selected rare earth elements, namely, Ce, La, and Gd. Structural properties of samples were determined by X-ray powder diffraction (XRD), and the phase ratio was calculated using the Rietveld method. Optical properties were analyzed by ultraviolet and visible light (UV-Vis) spectroscopy. Field emission scanning electron microscope (FE-SEM) was used to determine the morphological properties of samples and to estimate the size of primary crystals. X-ray photoelectron spectroscopy (XPS) was used to determine the chemical bonding properties of samples. Photocatalytic activity of the prepared photocatalysts as well as the titania available on the market (P25) was measured in three different setups, assessing volatile organic compound (VOC) degradation, NOx abatement, and water purification. It was found out that modification with rare earth elements slows down the transformation of anatase and brookite to rutile. Whereas the unmodified sample was composed of only rutile, La- and Gd-modified samples contained anatase and rutile, and Ce-modified samples consisted of anatase, brookite, and rutile. Modification with rare earth metals has turned out to be detrimental to photocatalytic activity. In all cases, pure TiO2 outperformed the modified samples. Cerium-modified TiO2 was the least active sample, despite having a light absorption tail up to 585 nm wavelength. La- and Gd-modified samples did not show a significant shift in light absorption when compared to the pure TiO2 sample. The reason for the lower activity of modified samples was attributed to a greater Ti3+/Ti4+ ratio and a large amount of hydroxyl oxygen found in pure TiO2. All the modified samples had a smaller Ti3+/Ti4+ ratio and less hydroxyl oxygen
Keywords: TiO2, photocatalytic activity, rare earths, modification, visible light activity
Published in DiRROS: 22.11.2023; Views: 231; Downloads: 119
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Dinamika dolžine telomerov v levkocitih po zdravljenju z obsevanjem pri raku dojk
Tanja Marinko, Sara Redenšek Trampuž, Ana Trstenjak, Vita Dolžan, Katarina Trebušak Podkrajšek, Katja Goričar, 2023, published scientific conference contribution

Abstract: Obsevanje je del standardnega zdravljenja bolnic z rakom dojk. Odgovor na zdravljenje z obsevanjem je pri vsakem posamezniku drugačen in je odvisen tudi od genetskih dejavnikov. Eden od novejših genetskih označevalcev odgovora na obsevanje je dolžina telomerov. Telomeri ščitijo kromosome pred krajšanjem in vzdržujejo genomsko stabilnost. Rezultati naše raziskave kažejo, da se dinamika spreminjanja dolžine telomerov takoj po zdravljenju z obsevanjem in v šestih mesecih po obsevanju pri bolnicah z neinvazivnim rakom dojk spreminja in bi lahko služila kot biološki označevalec odgovora na obsevanje. Molekularni mehanizmi, povezani s tem procesom, ostajajo zaenkrat večinoma neraziskani.
Keywords: rak dojk, obsevanje, onkološko zdravljenje
Published in DiRROS: 16.06.2023; Views: 307; Downloads: 123
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Novosti na področju radioterapije in radiobiologije: od raziskav do klinike : zbornik prispevkov in povzetkov
2023, proceedings of peer-reviewed scientific conference contributions (international and foreign conferences)

Published in DiRROS: 09.06.2023; Views: 483; Downloads: 226
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Obsevanje raka dojk pri brca1 in brca2 pozitivnih bolnicah
Alenka Jerala, Mateja Krajc, Tanja Marinko, 2022, published professional conference contribution abstract

Keywords: onkologija, rak dojke, obsevanje
Published in DiRROS: 09.02.2023; Views: 306; Downloads: 90
.pdf Full text (40,23 KB)

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Vloga miR-21 in miR-34a pri odgovoru na zdravljenje z obsevanjem pri raku dojk
Aspasija Cvetkoska, Katja Goričar, Tanja Marinko, 2022, published professional conference contribution abstract

Keywords: onkologija, rak dojke, kemoterapija
Published in DiRROS: 09.02.2023; Views: 315; Downloads: 87
.pdf Full text (38,11 KB)

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25 let razvoja radioterapije raka dojk
Tanja Marinko, 2022, published professional conference contribution

Abstract: Izjemen tehnološki napredek na področju radioterapije v zadnjih 25 letih je omogočil, da se je tudi radioterapija raka dojk v tem obdobju zelo spremenila. Največje spremembe so se zgodile na področju načrtovanja in izvedbe radioterapije, ki je prešla iz obdobja dvodimenzionalne (2D) radioterapije v obdobje veliko bolj natančne in nadzorovane tridimenzionalne (3D) radioterapije. Moderni obsevalni aparati, ki jih imamo na voljo, nam omogočajo ne samo 3D radioterapije, ki je trenutno v radioterapiji raka dojk prevladujoča tehnika, ampak tudi vse najbolj napredne tehnike obsevanja: IMRT (intenzitetno modulirana radioterapija), VMAT (volumetrična modulirana ločna terapija) in stereotaktično obsevanje. V zadnjih 25 letih so se nekoliko spremenile tudi indikacije za obsevanje, vendar bistveno manj kot tehnika obsevanja raka dojk. Glede na rezultate raziskav po letu 2015 obsevamo skoraj vse bolnice, ki imajo prisotne zasevke v pazdušnih bezgavkah. Spremenilo se je tudi obsevano področje. Danes pri lokoregionalnem obsevanju v obsevano področje pogosto vključimo tudiparasternalne bezgavke. Dodatek doze na ležišče tumorja danes s pomočjo modernih načrtovalnih računalniških programov večinoma apliciramo že med samim obsevanjem cele dojke, kar imenujemo SIB (sočasni integrirani boost), medtem, ko smo dodatek doze včasih vedno aplicirali šele po obsevanju cele dojke. Moderno zdravljenje z obsevanjem je bolnici povsem prilagojeno, tako glede tehnike obsevanja kot glede obsevanega področja ter predpisanega odmerka sevanja.
Keywords: radioterapija, rak dojke, bolniki
Published in DiRROS: 22.12.2022; Views: 368; Downloads: 89
.pdf Full text (40,44 KB)

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