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1.
Optimised calibration procedure for bioanalytical determination of organophosphate pesticides in apple juices by immobilised AChE
Boris Pihlar, Klavdija Mežnar, Mladen Franko, Lea Pogačnik, 2003, original scientific article

Abstract: Optimised calibration procedure for bioanalytical determination of organophosphate pesticides in apple juices by immobilised AChE
Found in: ključnih besedah
Summary of found: ...analitske metode, biosenzorji, pesticidi, sadni sokovi, analytical techniques, biosensors, FIA, flow injection analysis, pesticides, fruit...
Keywords: analitske metode, biosenzorji, pesticidi, sadni sokovi, analytical techniques, biosensors, FIA, flow injection analysis, pesticides, fruit juices
Published: 17.05.2016; Views: 3447; Downloads: 10
URL Fulltext (0,00 KB)

2.
High-redshift supernova rates measured with the gravitational telescope A 1689
Tanja Petrushevska, R. Amanullah, Ariel Goobar, S. Fabbro, Joel Johansson, Tor Kjellsson, Chris Lidman, K. Paech, Johan Richard, H. Dahle, Raphael Ferretti, J.P. Kneib, M. Limousin, Jakob Nordin, V. Stanishev, 2016, original scientific article

Abstract: Aims. We present a ground-based, near-infrared search for lensed supernovae behind the massive cluster Abell 1689 at z = 0.18, which is one of the most powerful gravitational telescopes that nature provides. Methods. Our survey was based on multi-epoch J-band observations with the HAWK-I instrument on VLT, with supporting optical data from the Nordic Optical Telescope. Results. Our search resulted in the discovery of five photometrically classified, core-collapse supernovae with high redshifts of 0.671 < z < 1.703 and magnifications in the range ∆m = −0.31 to −1.58 mag, as calculated from lensing models in the literature. Owing to the power of the lensing cluster, the survey had the sensitivity to detect supernovae up to very high redshifts, z ∼ 3, albeit for a limited region of space. We present a study of the core-collapse supernova rates for 0.4 ≤ z < 2.9, and find good agreement with previous estimates and predictions from star formation history. During our survey, we also discovered two Type Ia supernovae in A 1689 cluster members, which allowed us to determine the cluster Ia rate to be 0.14+0.19 −0.09 ± 0.01 SNuB h 2 (SNuB ≡ 10−12 SNe L −1 ,B yr−1), where the error bars indicate 1σ confidence intervals, statistical and systematic, respectively. The cluster rate normalized by the stellar mass is 0.10+0.13 −0.06 ± 0.02 in SNuM h 2 (SNuM ≡ 10−12 SNe M−1 yr−1). Furthermore, we explore the optimal future survey for improving the core-collapse supernova rate measurements at z & 2 using gravitational telescopes, and for detections with multiply lensed images, and we find that the planned WFIRST space mission has excellent prospects. Conclusions. Massive clusters can be used as gravitational telescopes to significantly expand the survey range of supernova searches, with important implications for the study of the high-z transient Universe.
Found in: ključnih besedah
Summary of found: ...formation – galaxies: clusters: individual: A 1689 – techniques: photometric...
Keywords: supernovae: general – gravitational lensing: strong – galaxies: star formation – galaxies: clusters: individual: A 1689 – techniques: photometric
Published: 23.01.2018; Views: 2408; Downloads: 0
.pdf Fulltext (2,64 MB)

3.
Determination of iron in natural waters using DGT technique coupled to phototermal beam deflection spectroscopy
Hanna Budasheva, Arne Bratkič, Dorota Korte, Mladen Franko, 2018, published scientific conference contribution abstract

Found in: ključnih besedah
Summary of found: ...diffusive gradients in thin-films, iron species, photothermal techniques, natural waters....
Keywords: Beam deflection spectroscopy, diffusive gradients in thin-films, iron species, photothermal techniques, natural waters.
Published: 09.11.2018; Views: 2293; Downloads: 0
.pdf Fulltext (40,53 KB)

4.
Optimization of DGT technique for determination of iron species in natural water and sediments by photothermal beam deflection spectroscopy
Mladen Franko, Dorota Korte, Arne Bratkič, Hanna Budasheva, 2018, published scientific conference contribution abstract

Found in: ključnih besedah
Summary of found: ...in thin-film technique, iron redox species, photothermal techniques, natural water, sediments...
Keywords: beam deflection spectroscopy, diffusive gradients in thin-film technique, iron redox species, photothermal techniques, natural water, sediments
Published: 23.11.2018; Views: 2426; Downloads: 0
.pdf Fulltext (386,02 KB)

5.
Soft x-ray second harmonic generation as an interfacial probe
R. K. Lam, Giovanni De Ninno, 2018, original scientific article

Found in: ključnih besedah
Summary of found: ...x-ray techniques, nonlinear optics, surfaces, second order nonlinear optical...
Keywords: x-ray techniques, nonlinear optics, surfaces, second order nonlinear optical processes
Published: 14.01.2019; Views: 1928; Downloads: 0
.pdf Fulltext (416,13 KB)

6.
Determination of Dissolved Iron Redox Species in Freshwater Sediment using DGT Technique Coupled to BDS
Yue Gao, Arne Bratkič, Dorota Korte, Aleksander Kravos, Hanna Budasheva, Mladen Franko, 2019, original scientific article

Abstract: In this work we have developed a novel method for determination of iron redox species by the use of diffusive gradients in thin-film (DGT) technique coupled to photothermal beam deflection spectroscopy (BDS). The combination of both methods achieved low limit of detection (LOD) of 0.14 μM for Fe (II) ions. The total Fe concentration determined in the Vrtojbica river sediment (Slovenia, Rožna Dolina, 5000 Nova Gorica) was 49.3 μgL–1. The Fe (II) and Fe (III) concentra- tion amounted to 12.8 μgL–1 and 39.9 μgL–1, respectively. Such an approach opens new opportunities for monitoring the content of iron species in natural waters and sediments and provides highly sensitive chemical analysis and an accurate qualitative and quantitative characteristic of the materials under study.
Found in: ključnih besedah
Summary of found: ...in thin-film technique, iron redox species, photothermal techniques, sediment...
Keywords: Beam deflection spectroscopy, diffusive gradients in thin-film technique, iron redox species, photothermal techniques, sediment
Published: 26.02.2019; Views: 2389; Downloads: 88
.pdf Fulltext (452,58 KB)

7.
Novel methods and applications of photothermal techniques for speciation studies in environmental samples
Leja Goljat, Hanna Budasheva, Virginie Vinatier, Anne-Marie Delort, Dorota Korte, Mladen Franko, 2019, published scientific conference contribution abstract

Found in: ključnih besedah
Keywords: photothermal techniques, Fe determination
Published: 16.07.2019; Views: 2304; Downloads: 0
.pdf Fulltext (29,62 MB)

8.
Photothermal spectrophotometer for meaurements of low absorption in liquid samples
J. Akbar, Humberto Cabrera, Dorota Korte, 2019, published scientific conference contribution abstract

Found in: ključnih besedah
Summary of found: ...photothermal spectroscopy techniques, halogen lamps, TL signal...
Keywords: photothermal spectroscopy techniques, halogen lamps, TL signal
Published: 16.07.2019; Views: 1955; Downloads: 0
.pdf Fulltext (324,00 KB)

9.
Towards a novel method for iron species determination in Antarctic sea ice
Hanna Budasheva, Arne Bratkič, Dorota Korte, Mladen Franko, 2021, published scientific conference contribution abstract

Abstract: Sea-ice borne iron has been found to be an important factor controlling Southern Ocean phytoplankton growth [1]. Knowing the amount and chemical speciation of its labile fraction in sea ice would advance our understanding of the involved processes. Unfortunately, it is rather difficult to perform their measurement because of limited access to the Antarctic. Thus there is a strong need for the development of a quick, simple and reliable technique for determination of iron and its speciation in sea-ice that ensures also low enough limits of detection. Recently, diffusive gradients in thin films (DGT) have been widely used as passive samplers for collecting time-averaged data on the concentrations of transition metals in different media [2]. DGTs are further coupled to an analytical technique that in case of detecting metals in passive sampler films primarily requires their extraction [3], which may potentially lead to changes of the metal specification. In the present study, the beam deflection spectrometry (BDS) is coupled to DGT and used to determine the average concentration of iron in the sea ice samples collected at the Davis Station in the Antarctic. Such a combined technique has been already successfully applied for detecting labile iron species in freshwater sediments [4]. The obtained BDS data were validated by thermal lens spectrometry (TLS) and UV-Vis spectrophotometry (SPEC). The distribution of iron species over a given ice surface area using the DGT-BDS technique revealed total iron concentrations in the range of 0.6 – 5.3 μgL-1, whereas the Fe2+ content was found to be in the range of 0.1 – 1.5 μgL-1. The range taking into account all of the measurement points (5×4), the precision of a single measured point is 0.2 μgL-1. The calculated 24 h-average concentration of total Fe labile species in the ice by using BDS is 2.3 ± 0.5 μgL-1, which coincides with data obtained by SPEC (2.5 ± 0.4 μgL-1) and TLS (2.39 ± 0.02 μgL-1). Our results indicate that it is possible to develop a robust, contamination-resilient detection method for measuring the labile iron species concentration in the sea ice. In opposite to TLS and SPEC, BDS-DGT provides reliable information not only about the speciation of iron but also about their distribution on the ice surface.
Found in: ključnih besedah
Summary of found: ...diffusive gradients, thin films, iron species, photothermal techniques, Antarctic sea ice...
Keywords: beam deflection spectrometry, diffusive gradients, thin films, iron species, photothermal techniques, Antarctic sea ice
Published: 30.11.2021; Views: 573; Downloads: 0
.pdf Fulltext (216,61 KB)
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