O recentnim nalazima morskog psa kučka, Isurus oxyrinchus (Rafinesque, 1810) u Jadranskom moru

Eight individuals of the shortfin mako shark, Isurus oxyrinchus (Rafinesque, 1810) have been recorded in the period from 2014 to 2017 in the Adriatic Sea. The specimens presented in the paper were identified on the basis of photographic evidence. Occurrences of juvenile specimens suggests that Adriatic Sea could serve as a nursery area for this species, especially its eastern part. A review of the previously documented occurrences of this species in the Adriatic Sea is given in this article.Osam primjeraka morskog psa kučka, Isurus oxyrinchus (Rafinesque, 1810) ulovljeno je u razdoblju od 2014. do 2017. u Jadranskom moru. Primjerci prikazani u ovom radu determinirani su na osnovi fotografskog materijala. Prisutnost nedoraslih i novookoćenih primjeraka ukazuje na važnost istočne obale Jadranskog mora kao područja rastilišta ove vrste. U radu je dat i pregled ranijih nalaza ove vrste u Jadranskom moru

Niskofonska laboratorija Instituta za fiziku - prvih dvadeset godina

Представљена је делатност сарадника Нискофонске лабораторије од њене изградње до данас. Почетна мерења концентрације радона, интензитета космичког зрачења и фона гама зрачења временом су, методолошким приступом, прерасла у континуирани мониторинг. Статистички значајни резулатати добијени након дуготрајних мерења, допуњени поузданим симулацијама и анализирани напредним мултиваријантним техникама јасно идентификују Нискофонску лабораторију у свим њеним областима истраживања.The most important scientific activities in the Low-background laboratory are described for the entire period of its existance. Over the period of twenty years, initial measurements of radon concentration, cosmic-rays intensity as well as gamma radiation background through metodological approach evolved into consistent continual monitoring. Statistically significant results obtained by long-term measurements, enriched by reliable simulation and analyzed using advanced analysis tools clearly identify our Lab.Зборник радова : XXIX симпозијум ДЗЗСЦГ : Сребрно језеро, 27-29. септембар 2017. годин

Niskofonska laboratorija Instituta za fiziku - prvih dvadeset godina

Представљена је делатност сарадника Нискофонске лабораторије од њене изградње до данас. Почетна мерења концентрације радона, интензитета космичког зрачења и фона гама зрачења временом су, методолошким приступом, прерасла у континуирани мониторинг. Статистички значајни резулатати добијени након дуготрајних мерења, допуњени поузданим симулацијама и анализирани напредним мултиваријантним техникама јасно идентификују Нискофонску лабораторију у свим њеним областима истраживања.The most important scientific activities in the Low-background laboratory are described for the entire period of its existance. Over the period of twenty years, initial measurements of radon concentration, cosmic-rays intensity as well as gamma radiation background through metodological approach evolved into consistent continual monitoring. Statistically significant results obtained by long-term measurements, enriched by reliable simulation and analyzed using advanced analysis tools clearly identify our Lab.Зборник радова : XXIX симпозијум ДЗЗСЦГ : Сребрно језеро, 27-29. септембар 2017. годин

Glaciimonas alpina sp. nov. isolated from alpine glaciers and reclassification of Glaciimonas immobilis Cr9-12 as the type strain of Glaciimonas alpina sp. nov.

Psychrophilic bacterial strains were isolated from alpine glaciers in Switzerland and characterized taxonomically. On the basis of phylogenetic analysis of partial 16S rRNA and rpoB genes, three of those strains, strain 79 ( = CCOS 247), strain 4/58 ( = CCOS 250) and strain 4/56 ( = CCOS 258) clustered together with strain Cr9-12T and separately from the type strains Glaciimonas immobilis Cr9-30T and Glaciimonas singularis LMG 27070T. Strain Cr9-12T has been previously described as a strain of G. immobilis. The three newly isolated strains were compared phenotypically with strain Cr9-12T and with the type strains of the species G. immobilis and G. singularis. Cr9-12T and the three novel strains from an alpine glacier in Switzerland were Gram-stain-negative, non-motile, rod-shaped and psychrophilic and showed good growth throughout a temperature range of 1-20°C and characteristically oxidized d-mannitol, l-fucose and bromosuccinic acid. The predominant cellular fatty acids of strain Cr9-12T and the three novel strains were summed feature 3 (C16 : 1ω7c and/or iso-C15 : 0 2-OH), C16 : 0 and C18 : 1ω7c. The respiratory quinone of these strains was ubiquinone 8 (UQ-8). The genomic DNA G+C content of Cr9-12T was 49.2 mol%. The combined data from phenotypic, phylogenetic and DNA-DNA relatedness studies strongly support the reclassification of strain Cr9-12T as representing a novel species. This strain and the isolates 79 ( = CCOS 247), 4/58 ( = CCOS 250) and 4/56 ( = CCOS 258) are representatives of a novel species of the genus Glaciimonas, for which the name Glaciimonas alpina sp. nov. is proposed. The type strain of Glaciimonas alpina is Cr9-12T ( = CCOS 761T = DSM 22814T)

Correlation analysis of solar energetic particles and secondary cosmic ray flux

Galactic cosmic rays entering heliosphere are modulated by interplanetary magnetic field which is carried away from the Sun by the solar wind. Cosmic rays are additionally modulated by coronal mass ejections and shock waves, which can produce Forbush decrease, a transient decrease in the observed galactic cosmic ray intensity. Measurements of magnetic field and plasma parameters in near-Earth space detect regularly coronal mass ejections, so it is important to understand the correlation between near-Earth particles fluxes associated with these coronal mass ejections and Forbush decreases. By combining in situ measurements of solar energetic particles with ground-based observations by the Belgrade muon detector, we analysed the dynamics of the variation of galactic cosmic rays. Correlation between variations of the flux of the cosmic rays and average in situ particle fluxes was investigated during Forbush decreases. Correlation exhibited dependence on the energy of solar wind particles, but also on cut-off rigidities of cosmic rays detected on the ground. The goal of cross-correlation analysis is to help in better understanding of how coronal mass ejections affect space weather as well as the effects they have on primary cosmic ray variations as detected by ground-based cosmic ray detectors

Observation of Abrupt Changes in the Sea Surface Layer of the Adriatic Sea

We observed interannual changes in the temperature and salinity of the surface layer of the Adriatic Sea when measured during the period 2005–2020. We observed non-stationarity and a positive linear trend in the series of mixed layer depth, heat storage, and potential energy anomalies. This non-stationarity was related to the climate regime that prevailed between 2011 and 2017. We observed significant changes in the interannual variability of salinity above and below the mixed layer depth and a positive difference in the surface barrier layer. In an effort to reconstruct the cause of this phenomenon, a multi-stage investigation was conducted. The first suspected culprit was the change in wind regime over the Mediterranean and Northeast Atlantic regions in September. Using the growing neural gas algorithm, September wind fields over the past 40 years were classified into nine distinct patterns. Further analysis of the CTD data indicated an increase in heat storage, a physical property of the Adriatic Sea known to be strongly influenced by the inflow of warm water masses controlled by the bimodal oscillating system (BiOS). The observed increase in salinity confirmed the assumption that BiOS activity affects heat storage. Unexpectedly, this analysis showed that an inverse vertical salinity profile was present during the summer months of 2015, 2017, and 2020, which can only be explained by salinity changes being a dominant factor. In addition, the aforementioned wind regime caused an increase in energy loss through latent energy dissipation, contributing to an even larger increase in salinity. While changes in the depth of the mixed layer in the Adriatic are usually due to temperature changes, this phenomenon was primarily caused by abrupt changes in salinity due to a combination of BiOS and local factors. This is the first record of such an event

Observation of Abrupt Changes in the Sea Surface Layer of the Adriatic Sea

We observed interannual changes in the temperature and salinity of the surface layer of the Adriatic Sea when measured during the period 2005–2020. We observed non-stationarity and a positive linear trend in the series of mixed layer depth, heat storage, and potential energy anomalies. This non-stationarity was related to the climate regime that prevailed between 2011 and 2017. We observed significant changes in the interannual variability of salinity above and below the mixed layer depth and a positive difference in the surface barrier layer. In an effort to reconstruct the cause of this phenomenon, a multi-stage investigation was conducted. The first suspected culprit was the change in wind regime over the Mediterranean and Northeast Atlantic regions in September. Using the growing neural gas algorithm, September wind fields over the past 40 years were classified into nine distinct patterns. Further analysis of the CTD data indicated an increase in heat storage, a physical property of the Adriatic Sea known to be strongly influenced by the inflow of warm water masses controlled by the bimodal oscillating system (BiOS). The observed increase in salinity confirmed the assumption that BiOS activity affects heat storage. Unexpectedly, this analysis showed that an inverse vertical salinity profile was present during the summer months of 2015, 2017, and 2020, which can only be explained by salinity changes being a dominant factor. In addition, the aforementioned wind regime caused an increase in energy loss through latent energy dissipation, contributing to an even larger increase in salinity. While changes in the depth of the mixed layer in the Adriatic are usually due to temperature changes, this phenomenon was primarily caused by abrupt changes in salinity due to a combination of BiOS and local factors. This is the first record of such an event