Analysis of 238U, 226Ra and 210Pb transfer factors form soil to the leaves of broadleaf tree species

The analysis of 238U, 226Ra and 210Pb transfer factors (TFs) from soil to the mature leaves of broadleaf trees was done by using available data from a few published studies performed at sites modified by uranium presence for Quercus pyrenaica, Quercus ilex rotundifolia, Populus sp. (Charro and Moyano 2017), Eucalyptus botryoides Sm. (Galhardi et al. 2017) and Quercus ilex, Quercus suber, Eucalyptus camaldulensis (Blanco Rodriguez et al. 2010) and at site of background radioactivity level for Tilia spp. and Aesculus hippocastanum L. (Vukašinović et al. 2019). Activity concentration datasets for 238U, 226Ra and 210Pb in soil in the range (Bqkg-1): 22–6606 (n=15), 38–7700 (n=14) and 37–7500 (n=14), respectively and in the leaves (Bqkg-1): <mdc–138 (n=10), 2.6–134 (n=14) and 27–77 (n=14), respectively indicated no significant departure from normality after log-transformation. Values of measured basic soil parameters of pH, total Ca, percentages of sand fraction and silt+clay fraction could also be retrieved. It was examined whether there were any differences between soil-to-leaves TFs found at affected sites compared to the background site. Differences at the 95% confidence level were not found between TF values for 238U and 226Ra, while 210Pb TFs were found significantly higher at background site. Additionally, prediction of 238U, 226Ra (Figure 1) and 210Pb TF values was performed based on the available data using multiple linear regression. Results indicated that differences between examined broadleaf species had lesser influence on transfer of investigated radionuclides from soil to tree leaves compared to the impact of basic soil parameters, especially activity concentrations in soil

Erratum: Systematic uncertainties in integrated luminosity measurement at CEPC (Journal of Instrumentation (2022) 17 (P09014) DOI: 10.1088/1748-0221/17/09/P09014)

The very forward region is one of the most challenging regions to instrument at a future + − collider. At CEPC, machine-detector interface includes, among others, a calorimeter dedicated for precision measurement of the integrated luminosity at a per mill level or better. Here we review a feasibility of such precision, from the point of view of systematic effects arising from luminometer mechanical precision and positioning, beam-related requirements and physics background from two-photon processes. The impact of the beam energy spread and its uncertainty on the integrated luminosity precision is also discussed, as well as the achievable beam energy spread precision with the post-CDR CEPC beamsLink to the corrected article: [https://vinar.vin.bg.ac.rs/handle/123456789/10567

Performance and Molière radius measurements using a compact prototype of LumiCal in an electron test beam

A new design of a detector plane of sub-millimetre thickness for an electromagnetic sampling calorimeter is presented. It is intended to be used in the luminometers LumiCal and BeamCal in future linear e+e- collider experiments. The detector planes were produced utilising novel connectivity scheme technologies. They were installed in a compact prototype of the calorimeter and tested at DESY with an electron beam of energy 1–5 GeV. The performance of a prototype of a compact LumiCal comprising eight detector planes was studied. The effective Molière radius at 5 GeV was determined to be (8.1 ± 0.1 (stat) ± 0.3 (syst)) mm, a value well reproduced by the Monte Carlo (MC) simulation (8.4 ± 0.1) mm. The dependence of the effective Molière radius on the electron energy in the range 1–5 GeV was also studied. Good agreement was obtained between data and MC simulation. © 2019, The Author(s)

Characterization and antimicrobial activity of bacteriocin 217 produced by natural isolate Lactobacillus paracasei subsp paracasei BGBUK2-16

The strain Lactobacillus paracasei subsp. paracasei BGBUK2-16, which was isolated from traditionally homemade white-pickled cheese, produces bacteriocin 217 (Bac217; similar to7 kDa). The onset of Bac217 biosynthesis was observed in the logarithmic phase of growth, and the production plateau was reached after 9 or 12 h of incubation at 37 and 30degreesC, respectively, when culture entered the early stationary phase. Biochemical characterization showed that Bac217 retained antimicrobial activity within the range of pH 3 to 12 or after treatment at 100degreesC for 15 min. Bac217 antimicrobial activity also remained unchanged after storage at 4degreesC for 6 months or -20degreesC for up to 12 months. However, Bac217 activity was completely lost after treatment with different proteolytic enzymes. BGBUK2-16 contains only one plasmid about 80 kb in size. Plasmid curing indicated that genes coding for Bac217 synthesis and immunity seem to be located on this plasmid. Bac217 exhibited antimicrobial activity against some pathogenic bacteria, such as Staphylococcus aureus and Bacillus cereus. Interestingly, Bac217 showed activity against Salmonella sp. and Pseudomonas aeruginosa ATCC27853. The inhibitory effect of BGBUK2-16 on the growth of S. aureus in mixed culture was observed. S. aureus treatment with Bac217 led to a considerable decrease (CFU/ml) within a short period of time. The mode of Bac217 action on S. aureus was identified as bactericidal. It should be noted that the strain BGBUK2-16 was shown to be resistant to bacteriocin nisin, which is otherwise widely used as a food additive for fermented dairy products

Emergency or delayed surgical treatment of unstable supracondylar humeral fractures in children?

© 2017, University of Kragujevac, Faculty of Science. All rights reserved. Supracondylar humeral fractures (SCHF) are the most common elbow fractures in children, representing 3% of all paediatric fractures. Treatment options for SCHF in children are based on the Gartland classification. Treatment of non-displaced fractures (type I) is non-operative. Plaster immobilization for 3 to 4 weeks is recommended, depending on the age of the child and fracture healing. Treatments of displaced supracondylar fractures (type II and III) of the humerus in children are still undefined in clinical practice. Because of divided opinions, the aim of this study was to evaluate whether delayed or immediate surgical treatment has an advantage in the treatment of supracondylar fractures in children. This is a prospective – retrospective clinical study. This study included 64 patients from 5 to 15 years old; 47 (73.4%) were boys and 17 (26.6%) were girls. The most common age range (59.4%) in this study was 5-8 years old. All patients were diagnosed with supracondylar fractures at the Institute for Orthopaedic Surgery “Banjica”. We analysed 17 parameters, which were obtained either from direct patient interviews or from their medical history. All patients were divided into two groups with matched characteristics. Group I consisted of 26 patients who had immediate operations. Group II consisted of 38 patients who had delayed operations. Based on the results of the analysed parameters, consisting primarily of functional results, the absence of subjective symptoms and myositis ossificans one year after surgery suggests that emergency surgical treatment of displaced supracondylar humeral fractures is optimal

Systematic uncertainties from mechanics and MDI in luminosity measurement at CEPC

The very forward region is one of the most challenging regions to instrument at a future $e^+e^-$ collider. At CEPC, machine-detector interface include, among others, a calorimeter dedicated for precision measurement of the integrated luminosity at a permille level or better. Here we review a feasibility of such precision, from the point of view of luminometer mechanical precision and positioning, beam-related requirements and physics background.A method of the effective center-of-mass determination due to the beam-spread, initially proposed for FCC, is also discussed for the CEPC beams

Measurement of the H to ZZ branching fraction at a 350 GeV and 3 TeV CLIC

In this paper we investigate the prospects for measuring the branching fraction of the Standard Model Higgs boson decay into a pair of Z bosons at the future Compact Linear Collider (CLIC) at 350 GeV and 3 TeV center-of-mass energies. Studies are performed using a detailed simulation of the detector for CLIC, taking into consideration all relevant physics and beam-induced background processes. It is shown that the product of the Higgs production cross section and the branching fraction BR(H→ZZ*) can be measured with a relative statistical uncertainty of 20% (3.0%) at a center-of-mass energy of 350 GeV (3 TeV) using semileptonic final states, assuming an integrated luminosity of 1  ab-1 (5  ab-1).In this paper we investigate the prospects for measuring the branching fraction of the Standard Model Higgs boson decay into a pair of $Z$ bosons at the future Compact Linear Collider (CLIC) at 350 GeV and 3 TeV centre-of-mass energies. Studies are performed using a detailed simulation of the detector for CLIC, taking into consideration all relevant physics and beam-induced background processes. It is shown that the product of the Higgs production cross-section and the branching fraction BR(${H\rightarrow\thinspace ZZ^\ast}$) can be measured with a relative statistical uncertainty of 20% (3.0%) at a centre-of-mass energy of 350 GeV (3 TeV) using semileptonic final states, assuming an integrated luminosity of 1 ab$^{-1}$ (5 ab$^{-1}$)