A note on extremal Sombor indices of trees with a given degree sequence

We note here that the problem of determining extremal values of Sombor index for trees with a given degree sequence fits within the framework of results by Hua Wang from [Cent. Eur. J. Math. 12 (2014) 1656-1663], implying that the greedy tree has the minimum Sombor index, while an alternating greedy tree has the maximum Sombor index

Sindrom nakon boravka u jedinici intenzivne njege kod kirurških pacijenata – pilot studija

Aim. The retrospective observational study aimed to determine whether there is a defined syndrome after intensive care after less than 14 days of stay in the intensive care unit. Material and methods. Patients who stayed in the intensive care unit of the Clinical Hospital Center “Dr. Dragiša Mišović – Dedinje” in Belgrade during the May 2022 were examined. Data from the health information system and therapeutic lists were used, and the questionnaire on quality of life was filled out during telephone conversations with patients. In the end, the data were statistically processed. Results. Of 16 patients, the average stay in the intensive care unit was 4.7 days (from 2 to 10). In eight of them, a certain level of change in the general state of health was shown in the last year (which includes the period of hospitalization), and in two of them this change was significant. The general health was significantly impaired in four of them, primarily related to male sex, age and ASA status. In these four patients, the length of stay in the intensive care unit was eight days at maximum. Conclusion. The results of this pilot study indicate the occurrence of the syndrome after intensive treatment in our sample of patients. As the sample is small, more extensive studies are needed to confirm or refute the claim that even a stay shorter than 14 days in intensive care units can lead to a significant change in health status and the emergence of post-intensive care syndrome in critically ill patients.Cilj. Retrospektivna opservaciona studija imala je za cilj utvrditi postojanje definiranog sindroma nakon intenzivne njege kod pacijenata sa boravkom kraćim od 14 dana u jedinici intenzivne njege Materijal i metode. Ispitani su pacijenti koji su boravili u jedinici intenzivne njege Kliničkog bolničkog centra “Dr. Dragiša Mišović – Dedinje” u Beogradu tijekom svibnja 2022. godine. Korišteni su podaci iz zdravstvenog informacijskog sustava i terapijskih lista, te je upitnik o kvaliteti života popunjen tijekom telefonskih razgovora sa pacijentima. Na kraju su podaci bili statistički obrađeni. Rezultati. Od 16 pacijenata, prosječan boravak u jedinici intenzivne njege iznosio je 4,7 dana (od 2 do 10). Kod osam pacijenata zabilježena je određena promjena općeg zdravstvenog stanja tijekom posljednje godine (uključujući period hospitalizacije), a kod dvoje je ta promjena bila značajna. Opće zdravlje značajno je bilo narušeno kod četvero pacijenata, uglavnom u vezi sa muškim spolom, dobi i ASA status. U ovih četvero pacijenata, najduže trajanje boravka u jedinici intenzivne njege bilo je osam dana. Zaključak. Rezultati ove pilot studije ukazuju na pojavu sindroma nakon intenzivnog liječenja na našem uzorku pacijenata. S obzirom na malen uzorak, potrebno je provesti opsežnije studije kako bi se potvrdila ili opovrgla tvrdnja da čak i boravak kraći od 14 dana u jedinicama intenzivne njege može dovesti do značajne promjene zdravstvenog stanja i pojave sindroma nakon intenzivne njege kod kritično bolesnih pacijenata

Noise Spectrum as a Source of Information in Gas Sensors Based on Liquid-Phase Exfoliated Graphene

Surfaces of adsorption-based gas sensors are often heterogeneous, with adsorption sites that differ in their affinities for gas particle binding. Knowing adsorption/desorption energies, surface densities and the relative abundance of sites of different types is important, because these parameters impact sensor sensitivity and selectivity, and are relevant for revealing the response-generating mechanisms. We show that the analysis of the noise of adsorption-based sensors can be used to study gas adsorption on heterogeneous sensing surfaces, which is applicable to industrially important liquid-phase exfoliated (LPE) graphene. Our results for CO2 adsorption on an LPE graphene surface, with different types of adsorption sites on graphene flake edges and basal planes, show that the noise spectrum data can be used to characterize such surfaces in terms of parameters that determine the sensing properties of the adsorbing material. Notably, the spectrum characteristic frequencies are an unambiguous indicator of the relative abundance of different types of adsorption sites on the sensing surface and their surface densities. We also demonstrate that spectrum features indicate the fraction of the binding sites that are already occupied by another gas species. The presented study can be applied to the design and production of graphene and other sensing surfaces with an optimal sensing performance

Ударне вести: емпиријске формуле, моларне масе, реакције биосинтезе и термодинамичке особине вирусних честица, биосинтезе и везивања Omicron JN.1 варијанте SARS-CoV-2

Breaking news are usually disturbing. Natural disasters, wars, epidemics etc. are reported as breaking news. This paper reports a decreased danger of spreading of epidemics caused by the JN.1 variant, since analyses indicate that (a) infectivity of the new variant is decreased compared to most earlier variants, which is confirmed by the number of cases (7500 daily in USA). Moreover, JN.1 despite the great number of mutations has not been able to achieve the values of Gibbs energy of biosynthesis (and thus virus multiplication rate) of the Hu-1 wild type. The research shows that infectivity and pathogenicity of the JN.1 variant has not reached worrying size, which means that there is no reason to expect a worsening of the epidemiologic situation.Ударне вести су обично узнемирујуће. О природним катастрофама, ратовима, епидемијама итд. се извештава као ударним вестима. У овом раду је приказана смањена опасност од ширења епидемија изазваних варијантом JN.1, јер анализе показују да је (а) инфективност нове варијанте смањена у односу на већину ранијих варијанти, што потврђује и број случајева (7500 дневно у САД). Штавише, JN.1 упркос великом броју мутација није успео да постигне вредности Гибсове енергије биосинтезе (а самим тим и стопе размножавања вируса) дивљег типа Hu.1. Истраживање показује да инфективност и патогеност варијанте JN.1 није достигла забрињавајућу величину, што значи да нема разлога за очекивање погоршање епидемиолошке ситуације.This is the accepted, peer-reviewed version of the article: M. E. Popović, M. Stevanović, and M. Mihailović, J. Serb. Chem. Soc. (2024) [https://doi.org/10.2298/JSC240119019P

Diversity and threat status of the Yugoslav bryoflora

In the Federal Republic of Yugoslavia, 616 species of bryophytes are recorded. Endemism is low compared with the vascular flora. Only 11 taxa have been treated as local endemics, but all except one are now regarded as synonyms of more widespread taxa. Encalypta serbica retains its endemic status, although as a taxonomically doubtful taxon. Of the Red Listed bryophytes of Europe, 37 moss and 5 liverwort species are present in F. R. Yugoslavia. Five of these are endemic to Europe including Maca ronesia. To date, no measures of bryophyte protection have been taken in F. R. Yugosla via. However, the major centres of bryophyte diversity are situated in Scien tific Reserves, Nature Conservation Reserves and National Parks

Modeling the organisational implementation of a drone and counter-drone operator into the Serbian Armed Forces rifle section

Drones are one of the new threats to tactical units. The armed forces use them with various successes in operations. However, the smallest tactical unit such as rifle section is generally still unprepared to operate drones and perform counter measures. Drones have a wide range of capabilities and therefore can be used for both civilian and military purposes. Along with the development of drones, counter-drone systems have also been developed. Several small drones and counter-drone systems suitable for the use by one man are presented in the first part of the research results to show that there is more than one system that can be selected for operational use. This also shows that one soldier in rifle section is capable of operating a small drone and counter-drone systems. This research has aimed to survey the organizational structure and determine organizational capabilities to implement a drone and counter-drone operator duty in rifle section. For that purpose, the research team has conducted a series of interviews with officers and non-commissioned officers of the Serbian Armed Forces and the Ministry of Defense. This duty is defined as "a drone operator" and in this research the Serbian Armed Forces rifle section is modeled in such a way to include a duty for 1) a specialized rifleman, 2) a converted sniper, or 3) an embedded soldier

Essential Oils as Feed AdditivesFuture Perspectives

The inconsistency of phytogenic feed additives' (PFA) effects on the livestock industry poses a risk for their use as a replacement for antibiotic growth promoters. The livestock market is being encouraged to use natural growth promotors, but information is limited about the PFA mode of action. The aim of this paper is to present the complexity of compounds present in essential oils (EOs) and factors that influence biological effects of PFA. In this paper, we highlight various controls and optimization parameters that influence the processes for the standardization of these products. The chemical composition of EOs depends on plant genetics, growth conditions, development stage at harvest, and processes of extracting active compounds. Their biological effects are further influenced by the interaction of phytochemicals and their bioavailability in the gastrointestinal tract of animals. PFA effects on animal health and production are also complex due to various EO antibiotic, antioxidant, anti-quorum sensing, anti-inflammatory, and digestive fluids stimulating activities. Research must focus on reliable methods to identify and control the quality and effects of EOs. In this study, we focused on available microencapsulation techniques of EOs to increase the bioavailability of active compounds, as well as their application in the animal feed additive industry

Supplementary data for the article: Kojic, I.; Bechtel, A.; Kittinger, F.; Stevanovic, N.; Obradovic, M.; Stojanovic, K. Study of Pyrolysis of High Density Polyethylene in the Open System and Estimation of Its Capability for Co-Pyrolysis with Lignite. J. Serb. Chem. Soc. 2018, 83 (7–8), 923–940. https://doi.org/10.2298/JSC171215027K

Supplementray material for: [https://doi.org/10.2298/JSC171215027K]Related to published version: [http://cherry.chem.bg.ac.rs/handle/123456789/2201