61. Antibacterial properties and cytotoxicity of 100% waste derived alkali activated materials : slags and stone wool-based bindersCaterina Sgarlata, Giovanni Dal Poggetto, Federica Piccolo, Michelina Catauro, Katja Traven, Mark Češnovar, Hoang Nguyen, Juho Yliniemi, Luisa Barbieri, Vilma Ducman, Isabella Lancellotti, Cristina Leonelli, 2021, original scientific article Abstract: In this study we compare the leaching behavior and the antibacterial and cytotoxic properties of 100% slag or stone wool derived alkali activated materials. The antibacterial activity was measured as the inhibiting capacity against two Gram- negative bacterial strains, Escherichia coli and Pseudomonas aeruginosa and one Gram-positive bacterial strain: Enterococcus faecalis. The cytotoxicity properties were tested on mouse embryonic fibroblast NIH-3T3 cell-line. It was proved that the high quality of the 3D aluminosilicate network of the consolidated materials obtained from powders of CaO or MgO-rich slags or stone wool, opportunely activated with NaO and/or Na-silicate, was capable of stabilizing heavy metal cations. The concentrations of leachate heavy cations were lower than the European law limit when tested in water. The effect of additives in the composites, basal fibers or nanocellulose, did not reduce the chemical stability and slightly influenced the compressive strength. Weight loss in water increased by 20% with basalt fibers addition, while it remained almost constant when nanocellulose was added. All the consolidated materials, cement-like in appearance, exhibited limited antibacterial properties (viability from 50 to 80% depending on the bacterial colony and the amount of sample) and absence of cytotoxicity, envisaging good acceptance from part of the final consumer and zero ecological impact. CaO-rich formulations can replace ordinary Portland cement (showing bacterial viability at 100%) with a certain capability for preventing the reproduction of the E. coli and S. aureus bacteria with health and environmental protection results.
Keywords: antibacterial properties, cytotoxicity, alkali-activated materials, slag, stone wool, waste utilization, social acceptance
Published in DiRROS: 22.05.2023; Views: 350; Downloads: 193
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62. Alkali activation of metallurgical slags : reactivity, chemical behavior, and environmental assessmentIsabella Lancellotti, Federica Piccolo, Katja Traven, Mark Češnovar, Vilma Ducman, Cristina Leonelli, 2021, original scientific article Abstract: Alkali-activated materials (AAMs) represent a promising alternative to conventional building materials and ceramics. Being produced in large amounts as aluminosilicate-rich secondary products, such as slags, they can be utilized for the formulation of AAMs. Slags are partially crystalline metallurgical residues produced during the high temperature separation of metallic and non-metallic materials in the steelmaking processes. In the present study, the electric arc furnace carbon or stainless steel slag (EAF) and secondary metallurgical slag such as ladle furnace basic slag (LS) were used as precursors in an alkali-activation process. EAF slag, with its amorphous fraction of about 56%, presented higher contents of soluble Si and Al species with respect to ladle slag R (35%). However, both are suitable to produce AAM. The leaching behavior shows that all the release values are below the regulation limit. All the bivalent ions (Ba, Cd, Cu, Ni, Pb, and Zn) are well immobilized in a geopolymeric matrix, while amphoteric elements, such as As and Cr, show a slight increase of release with respect to the corresponding slag in alkaline and aqueous environments. In particular, for Sb and As of AAM, release still remains below the regulation limits, while Mo presents an increase of leaching values that slightly exceeds the limit for landfill non-dangerous waste.
Keywords: slag, aluminosilicate materials, chemical reactivity, cold consolidation, alkali activation, leaching test, open access
Published in DiRROS: 22.05.2023; Views: 366; Downloads: 185
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63. Zdravljenje z zaviralcem imunskih kontrolnih točk pri bolniku s ploščatoceličnim karcinomom kože in mielofibrozo : prikaz primeraKatja Leskovšek, Janja Ocvirk, 2023, published scientific conference contribution Abstract: Imunosupresija je eden najpomembnejših dejavnikov tveganja za pojav ploščatoceličnega karcinoma kože. Tveganje je največje pri bolnikih po presaditvi solidnih organov, sledijo bolniki s presaditvijo kostnega mozga, okuženi s HIV in bolniki na imunosupresivnem zdravljenju s kemoterapijo, tarčnimi ali biološkimi zdravili. Običajno razvijejo multiple in recidivne ploščatocelične karcinome kože. Zdravljenje s kirurgijo in radioterapijo je pogosto neučinkovito in lahko povzroči pomembno morbiditeto, vodi v zmanjšano funkcijo organa ter posledično slabšo kvaliteto življenja. Bolniki imajo podvojeno tveganje za razsoj v oddaljene organe. Prognoza imunosuprimiranih bolnikov s ploščatoceličnim karcinomom kože je slabša. Na voljo so omejeni podatki o zdravljenju teh bolnikov z zaviralci imunskih kontrolnih točk kot so zaviralci PD-1.
Keywords: rak kože, melanom, sistemsko zdravljenje
Published in DiRROS: 18.05.2023; Views: 335; Downloads: 147
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64. Ukrepanje ob sumu pojava karantenskih škodljivih organizmov v Kočevju – simulacijska vaja v živoEva Groznik, Simon Zidar, Maarten De Groot, Nikica Ogris, Katja Kunc, Barbara Piškur, 2022, popular article Keywords: karantenski škodljivi organizmi, ukrepanje, simulacijska vaja
Published in DiRROS: 20.02.2023; Views: 518; Downloads: 84
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68. Načrtovano komuniciranje med epidemijo covid-19 kot del aktivnosti, s katerimi smo uspeli ohraniti udeležbo žensk v programu DORA nad 70%Amela Duratović Konjević, Vesna Škrbec, Kristijana Hertl, Katja Jarm, Mateja Kurir-Borovčić, Miloš Vrhovec, Veronika Kutnar, Lucija Kolar, Katarina Torkar, Cveto Šval, 2022, published professional conference contribution abstract Keywords: onkologija, rak dojke, mediji
Published in DiRROS: 03.02.2023; Views: 405; Downloads: 108
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69. Odlično zadovoljstvo žensk s programom DORA : rezultati anonimne anketeMateja Kurir-Borovčić, Katja Jarm, Miloš Vrhovec, Veronika Kutnar, Lucija Kolar, Katarina Torkar, Vesna Škrbec, Cveto Šval, Kristijana Hertl, 2022, published professional conference contribution abstract Keywords: onkologija, rak dojke, kemoterapija
Published in DiRROS: 27.01.2023; Views: 401; Downloads: 110
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70. S kemoterapijo povzročena periferna polinevropatija (CIPN)Katja Dejanović, Aljoša Andlovic, Breda Škrbinc, 2022, published scientific conference contribution Abstract: CIPN je disfunkcija perifernega živčevja kot posledica zdravljenja z enim ali s kombinacijo več citostatikov. Najpogostejši povzročitelji CIPN so taksani, derivati platine in vinka alkaloidi, njihovi vzročni mehanizmi CIPN se razlikujejo in so vezani na njihovo cititoksično aktivnost. CIPN se najpogosteje kaže s simptomatiko senzoričnega sistema, redkejše so motorične motnje in motnje avtonomnega živčnega sistema. Dejavniki tveganja za CIPN so splošni, ki jih dobro poznamo in jih do določene mere lahko tudi zamejimo, genetski dejavniki tveganja pa so aktualno predmet intenzivnih raziskav. Patofiziološki procesi nastanka CIPN so delno poznani, gre za več prekrivajočih se mehanizmov, ki povzročijo okvare na nivoju živčnih končičev, aksonske okvare, motnje senzoričnih ganglijev pa tudi okvaeo hrbtenjače. V patofiziološke mehanizme nastanka CIPN se vpletajo tudi nevro-imunski procesi. Diagnoza CIPN je klinična, v pomoč so lahko specifični vprašalniki za oceno kvalitete življenja, objektivni metoda ocene CIPN je EMG. CIPN ima praviloma reverzibilen potek, v posameznih primerih pa ugotavljamo kronično ireverzibilno stanje. Za zdravljenje CIPN uporabljamo v večji meri nefarmakološke ukrepe, v hujših primerih pa tudi medikamentozno podporo z gabapentinom, pregabalinom ter z amitriptilinom.
Keywords: neželeni učinki, bolniki, sistemsko zdravljenje
Published in DiRROS: 23.01.2023; Views: 463; Downloads: 108
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