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54. Pesticidi v vodonosniku Krško-Brežiškega poljaNina Mali, Anja Koroša, Janko Urbanc, 2021, original scientific article Abstract: Onesnaženje podzemne vode s pesticidi je splošno razširjen problem, tako v svetu kot tudi v Sloveniji. Glede na pretekle velike obremenitve podzemne vode s pesticidi, je bil namen predstavljene raziskave ugotoviti razširjenost pesticidov v podzemni vodi Krško-Brežiškega polja v obdobju 2018 - 2019 in pri tem preveriti uporabnost metode vzorčenja vode s pasivnimi vzorčevalniki. Skupno smo odvzeli 21 vzorcev podzemne vode na enajstih lokacijah in po dva vzorca v rekah Sava in Krka. V vodi smo določili 15 različnih pesticidov in njihovih razgradnih produktov. V vzorcih podzemne vode sta bila največkrat določena atrazin in njegov razgradni produkt desetilatrazin. Sledijo pesticidi desetilterbutilazin, terbutilazin, metolaklor ter simazin. V površinski vodi smo zaznali atrazin, desetilatrazin, klortoluron, metolaklor in terbutilazin. S kvalitativno metodo vzorčenja s pasivnimi vzorčevalniki smo v podzemni in površinski vodi odvzeli skupno 24 vzorcev. Izločili smo 8 pesticidov, ki se pojavljajo v dveh serijah. Pogostnost pojavljanja posameznih pesticidov je po obeh metodah primerljiva. Pasivno vzorčenje vode se je izkazalo za primerno metodo identifikacije prisotnosti pesticidov. Največje obremenitve s pesticidi na Krško-Brežiškem polju prihajajo s kmetijskih površin. Podzemna voda je bolj obremenjena s pesticidi v osrednjem delu polja v smeri toka od zahoda proti vzhodu. Atrazin in desetilatrazin sta še vedno, kljub dvajsetletni prepovedi, najpogosteje in v najvišjih koncentracijah zaznana pesticida v podzemni vodi Krško-Brežiškega polja.
Keywords: podzemna voda, vodonosnik Krško-Brežiško polje, pesticidi
Published in DiRROS: 09.03.2022; Views: 791; Downloads: 317
 Full text (11,46 MB) |
55. Geophysical investigations in the Radovna River Spring area (Julian Alps, NW Slovenia)Anja Torkar, Marjana Zajc, Jure Atanackov, Andrej Gosar, Mihael Brenčič, 2021, original scientific article Abstract: The Radovna River Valley is located in the north-western part of Slovenia in the Julian Alps, where there is an extensive intergranular aquifer whose depth to pre-Quaternary bedrock is unknown. Therefore, to obtain information about the depth of the valley and the geometry of the aquif er two geophysical methods were used in our study; ground penetrating radar (GPR) and seismic reflection method. The low-frequency GPR method has shown to be useful for determining the depth of the groundwater and the predominant groundwater recharge. Also, the high-resolution seismic method provided an insight about the morphology of the pre-Quaternary basement with the deepest point at 141 meters below surface. Measurements of hydrogeological parameters such as groundwater level and river discharge measurements were carried out in the study area. Both data analyses showed that groundwater level and river discharge are highly fluctuatingand rapidly changing, indicating a well-permeable aquifer, implying that such an aquifer is extremely sensitive and vulnerable to extreme climate events. Both the geophysical methods and the hydrogeological information have provided important information about the morphology of the valley and the alluvial aquifer, as well as increasing the knowledge about the Radovna springs system, which will contribute very important information for future hydrogeological studies.
Keywords: Ground penetrating radar, Seismic reflection method, Radovna spring, hydrogeology, aquifer geometry, glacial valley, groundwater table
Published in DiRROS: 09.03.2022; Views: 691; Downloads: 314
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56. Sedimentological and paleontological analysis of the Lower Jurassic part of the Zatrnik Formation on the Pokljuka plateau, SloveniaLuka Gale, Duje Kukoč, Boštjan Rožič, Anja Vidervol, 2021, original scientific article Abstract: The uppermost Ladinian to Lower Jurassic Zatrnik Formation is the lithostratigraphic unit of the Mesozoic deeper marine Bled Basin. The uppermost part of the Zatrnik Formation and the transition into the overlying Ribnica Breccia was logged at the Zajamniki mountain pasture on the Pokljuka mountain plateau in the Julian Alps. The lowermost part the section belongs to the “classical” Zatrnik Formation and is dominated by beige micritic limestone and fine-grained calcarenite. Foraminifers Siphovalvulina, ?Everticyclammina, ?Mesoendothyra and ?Pseudopfenderina are present, indicating Early Jurassic age. The beige limestone is followed by light pink limestone of the uppermost Zatrnik Formation. Slumps are common in this interval, and crinoids are abundant. Alongside some species already present in beds lower in the succession, Meandrovoluta asiagoensis Fugagnoli & Rettori, Trocholina sp., Valvulinidae, small Textulariidae, Lagenida, and small ?Ophthalmidium alsooccur in this interval. Resedimented limestone predominates through the studied part of the Zatrnik Formation, indicating deposition on the slope or at the foot of the slope of the basin. The switch to crinoid-rich facies within the slumped interval of the Zatrnik Formation may reflect accelerated subsidence of the margins of the Julian Carbonate Platform in the Pliensbachian. The Zatrnik Formation is followed by the formation of the Pliensbachian (?) Ribnica Breccia. Impregnations of ferromanganese oxides, violet colour, and an increase in clay content are characteristic. The foraminiferal assemblage consists of Lenticulina, small elongated Lagenida, and epistominids. Individual beds of the Ribnica Breccia were deposited via debris flows. Enrichments in ferromanganese oxides point to slower sedimentation.
Keywords: Lower Jurassic, Bled Basin, Pokljuka Nappe, stratigraphy, foraminifer, Hierlatz facies, Ribnica Breccia, Zajamniki
Published in DiRROS: 09.03.2022; Views: 679; Downloads: 293
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57. Passive sampling with active carbon fibres in the determination of organic pollutants in groundwaterPrimož Auersperger, Anja Koroša, Nina Mali, Brigita Jamnik, 2022, original scientific article Abstract: Legislation addressing the quality of groundwater and increasing concerns over public health calls for the development of analytical methods that can produce accurate and precise results at the ppt level. Passive sampling has been recognised as a helpful tool in identifying various organic pollutants in groundwater, even when their presence had not yet been identified through conventional groundwater quality monitoring. The article presents an analytical method involving a simple and cost-effective passive sampling device using Zorflex® activated carbon fibres (ACFs) for the qualitative monitoring of a broad range of organic pollutants in water in a single run. The applicability of the method developed was tested in three hydrogeological studies. In the first case, we present a non-targeted qualitative screening and a list of 892 different contaminants detected in the groundwater in Slovenia. In the second case, we discuss the presence and origin of organic compounds in the groundwater from a pilot area of the urban aquifer, Ljubljansko polje. The third case presents a comparison of results between passive and grab sampling. Passive sampling with ACFs confirmed the presence of a pollutant, even when it had not been previously detected through a quantitative method.
Keywords: GC-MS, organic pollutants, qualitative analysis, passive sampling, groundwater
Published in DiRROS: 03.03.2022; Views: 692; Downloads: 293
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58. Zdravljenje intrahepatalnega holangiokarcinoma s stereotaktičnim obsevanjem : prikaz primeraAnja Meden Boltežar, Ajra Šečerov Ermenc, 2021, professional article Abstract: V prispevku je opisan primer bolnice z lokalno napredovalim holangiokarcinomom intrahepatalnih žolčnih vodov, ki je redek malignom s svojevrstnim kliničnim potekom. Ob postavitvi diagnoze ima večina bolnikov napredovalo obliko bolezni in so posledično kandidati le za nekirurško zdravljenje – kemoterapijo, kombinacijo kemoterapije in radioterapije ali samo radioterapijo. Glavna omejitev pri zdravljenju z radioterapijo je doza, ki jo prejmejo jetra in priležni cevasti organi, zato se v zadnjem času čedalje bolj uveljavlja zdravljenje s stereotaktično radioterapijo. Ta omogoča, da dovedemo visoko dozo na tumor, pri čemer ščitimo rizične organe. Raziskave, ki so bile objavljene v zadnjih letih, so pokazale dobre rezultate zdravljenja inoperabilne bolezni z namenom poskusa zazdravitve bolezni in podaljšanja celokupnega preživetja.
Keywords: intrahepatalni holangiokarcinom, stereotaktično obsevanje, radioterapija
Published in DiRROS: 11.06.2021; Views: 2050; Downloads: 400
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59. Bolnik s karcinomom požiralnika z vstavljeno samoraztezno kovinsko opornico : prikaz primeraAnja Meden Boltežar, Tomaž Štupnik, Vaneja Velenik, 2021, professional article Abstract: Ureditev prehranskega statusa je eden glavnih ciljev pri bolnikih z rakom požiralnika, saj ima pomemben vpliv na potek in uspeh zdravljenja. Zaradi pogostega pojava disfagije in oteženega uživanja hrane skozi usta je pogosto treba že pred začetkom zdravljenja vzpostaviti prehransko pot. Izkazalo se je, da sta pri bolnikih na radikalnem zdravljenju, to je z namenom ozdravitve, NGS in perkutana hranilna stoma superiorni samorazteznim kovinskim opornicam. Čeprav samoraztezne kovinske opornice omogočajo hitro izboljšanje disfagije, so zaradi pogostih zapletov, tudi življenje ogrožajočih, primerne predvsem v sklopu paliativnega zdravljenja. V prispevku je opisan primer bolnika z rakom požiralnika na predoperativnem zdravljenju s predhodno vstavljeno samoraztezno kovinsko opornico.
Keywords: rak požiralnika, disfagija, samoraztezna kovinska opornica
Published in DiRROS: 10.06.2021; Views: 1237; Downloads: 335
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60. Usefulness of rapid antigen testing for SARS-CoV-2 screening of healthcare workers : ǂa ǂpilot studyAnja Šterbenc, Viktorija Tomič, Urška Bidovec, Katja Vrankar, Aleš Rozman, Mihaela Zidarn, 2021, short scientific article Abstract: Background. Identification of infected healthcare workers (HCWs) is an important step in severe acute respiratory syndrome coronavirus-2 (SARS-CoV-2) transmission control. Rapid antigen tests (RATs) are considered an important addition to molecular tests in diagnosing coronavirus disease 2019 (COVID-19), mainly because of their fast turnaround time, easier analytical procedure and lower price. However, real-life studies on the usefulness of such testing for screening of HCWs are limited. Methods. Physicians, nurses and hospital attendants currently working at the University Clinic of Respiratory and Allergic Diseases Golnik were invited to participate in the pilot study. Nasopharyngeal swabs were obtained three times per week for two consecutive weeks and tested with a point-of-care RAT and reverse transcription polymerase chain reaction (RT-PCR). Serum samples were obtained at the beginning of the study and 2 weeks after the last swab was collected to evaluate the serological status. Results. A total of 191 nasopharyngeal swabs from 36 HCWs were obtained. None of the samples tested was positive for the presence of SARS-CoV-2 antigen, whereas two HCWs tested positive on RT-PCR. Of these, one HCW had a newly identified SARS-CoV-2 infection, whereas RT-PCR probably detected a previous but recent infection in the other HCW. Conclusio.n Based on the results of this pilot study, it is unlikely that RAT will reliably detect novel SARS-CoV-2 infections among asymptomatic HCWs despite serial sampling. Although RT-PCR-based screening of HCWs may not be feasible due to high sample volume, molecular methods may identify SARS-CoV-2-infected HCWs already during the presymptomatic stage.
Keywords: SARS-CoV-2, health personnel, COVID-19 serological testing, real-time polymerase chain reaction, rapid antigen test, screening
Published in DiRROS: 28.05.2021; Views: 1053; Downloads: 309
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