Spin-glass behavior in KxRu4-yNiyO8 hollandite materials

We report the synthesis and comprehensive ac and dc susceptibility measurements of KxRu4−yNiyO8 hollandite. The value of the relative frequency shift, δTf , has been determined as 0.025 which is within the range expected for spin-glass systems (0.005–0.06). Additionally, the characteristic flipping time of a single spin flip, τ0, and the dynamical critical exponent, −zv, were determined to have values of 5.82×10−8 s and 6.1(3), respectively from the power law. While the value of τ0 is comparatively very large, −zv is consistent with what is expected for spin-glass systems. Field-cooled hysteresis behavior demonstrates a small increase in the remnant magnetization (at 2 K) on increasing the strength of the cooling field, suggesting that the degree of short-range correlations increases consistent with the formation of larger spin clusters. Thermoremnant magnetization data indicate an exponential-like decay of the magnetization as a function of time with the remnant magnetization remaining nonzero. However, it is clear from these data that multiple components contribute to the decay behavior. Collectively, these data confirm spin-glass character for K0.73(3)Ni1.9(5)Ru2.1(5)O8 and clearly demonstrate that the magnetic behavior of this material is far from simplistic

Eosinophlle cell reaction in response to cortisone in adapted rats

Poznato je, da životinje nakon ekspozicije nekom stresom pokazuju jaku eozinofilnu reakciju, t. j. broj eozinofilnih leukocita u perifernoj krvi pada. Nakon uzastopne ekspozicije istom stresom eozinofilna reakcija postepeno nestaje (1, 2, 3). Prestanak eozinofilne reakcije uzimaju neki autori (na pr. 4, 1, 2, 3) kao znak adaptacije organizma na određeni stresor, adaptirani organizam više ne povećava lučenje kortikoida, kad je izložen određenom stresom, i ne pokazuje prema tome ni eozinofilnu reakciju. Postoji i druga mogućnost, da organizam nakon uzastopne ekspozicije istom stresoru još uvijek reagira povećanim lučenjem adrenokortikalnih hormona, ali ti hormoni više ne izazivaju pad eozinofila u perifernoj krvi. Eozinofilna reakcija ne bi, dakle, izostala zbog prestanka pojačanog lučenja kortikoida, nego zbog adaptacije mehanizma za regulaciju broja eozinofila na prisutnost kortikoida u perifernoj krvi. Kako bismo provjerili tu mogućnost, promatrali smo eozinofilnu reakciju na kortizon kod neadaptiranih i adaptiranih štakora.In albino rats previously adapted to adrenalin or hypoxia the decrease in number of eosinophiles after an intraperitoneal injection of cortisone (2 mg/100 g) was the same as in control animals

Synthesis of BaTiO3 from a mechanically activated BaCO3-TiO2 system

In this article the solid state reaction of BaTiO3 formation from a mechanically activated BaCO3-TiO2 system has been investigated. An equimolar mixture of BaCO3 and TiO2 powders was activated in a planetary ball mill in a continual regime for 0, 30 and 90 min, pressed and thermally treated up to 1200°C. The effect of the milling and firing regime on the phase formation was investigated by the X-ray diffraction (XRD) method and differential thermal analysis (DTA). Deconvolution of the experimental DTA curve corresponding to the BaTiO3 synthesis process has been performed. The influence of the activation time on the change of characteristic temperature for each elementary step in the complete solid-state reaction of BaTiO3 formation, was analyzed. These results were correlated with the ones obtained by SEM characterization and by XRD analysis.U ovome radu je analiziran uticaj mehaničke aktivacije sistema BaCO3- TiO2 na formiranje BaTiO3. Ekvimolarne smeše praha BaCO3 i TiO2 su aktivirane u planetarnom mlinu u kontinualnom režimu tokom 0, 30 i 90 min. Uzorci su zatim presovani i termički tretirani do 1200oC. Efekat mlevenja i zagrevanja na promene faza je analiziran primenom rendgenske fazne analize i diferencijalne termijske analize. Izvršena je dekonvolucija eksperimentalno dobijene DTA krive koja odgovara procesu sinteze BaTiO3, kao i analiza uticaja vremena aktivacije na promene karakteristične temperature za svaki pojedinačni elementarni proces tokom sinteze barijum titanata. Ovi rezultati su korelisani sa rezultatima dobijenim SEM i XRD analizom

Structural characterisation of starch based edible films with essential oil addition

Present study investigated structure of starch based edible films with essential oil addition. Films were obtained from water solutions containing gelatinized modified starch, polyol, guar-xantan gum modified mixture and essential oil by casting it on a Petri dish and evaporating at room temperature for 72h. Both, glycerol and guar-xantan modified mixture, had role to improve film flexibility and enable better film folding and handling. Two sample groups were obtained: starch based edible films with black cumin oil addition and starch based edible films with black pepper oil addition. Both essential oils were added in three different concentrations. Starch based edible film without essential oil addition was used as blank shot. Structural properties were determined by analyzing spectra obtained by FT-IR Spectrometer in the spectral range of 4000–400 cm−1 with a 4.0 cm−1 resolution. Software Omnic 8.1. and TQ Analyst were used to operate the FTIR spectrometer, collect and present all the data. Results pointed to quantitative law dependency between added amount of essential oils and spectra absorption values for both sample groups and FTIR spectra were used to calculate coefficient of correlation

Trend proizvodnje prosa – Panicum miliaceum L. u svetu. Značaj prosa u ishrani i za bioenergiju

The aim of this study was to examine the productivity of millet (Panicum miliaceum L.; Poaceae) in the world and its importance in the food and in industries. Millet has a high grain yield and is an important source proteins in food. It has high biomass yield which is why it is of great importance in bioenergy production. The priority is to procure raw materials and develop the process of biofuel production in an economical way. Millet has the least need for water, of other cereals and is a significant crop in sustainable systems. Millet grain is rich in iron, calcium and vitamin B complex (B1, B2, B3). In addition to their nutritive value, helps prevent cancer and cardiovascular diseases, reduce tumor incidence, lower blood pressure, the risk of heart disease, cholesterol and rate of fat absorption have been reported for millet.Cilj ove studije bio je da se ispita produktivnost prosa (Panicum miliaceum L.; Poaceae) u svetu i prikaže njegov značaj u ishrani i u industriji. Proso ima visok prinos zrna i važan je izvor proteini u hrani i ima visok prinos biomase zbog čega ima veliki značaj u proizvodnji bioenergije. Prioritet je nabaviti sirovine i razviti proces proizvodnje biogoriva na ekonomičan način. Proso ima najmanje potrebe za vodom od ostalih žita i značajan je usev u održivim sistemima. Zno prosa bogato je sa gvožđem, kalcijumom i kompleksom vitamina B (B1, B2, B3). Pored njegove hranjive vrednosti, pomaže u prevenciji karcinoma i kardiovaskularnih bolesti, smanjenju incidencije tumora, sni-žavanju krvnog pritiska, riziku od bolesti srca, holesterola i brzini apsorpcije masti

Redox Parameters in Blood of Thyroid Cancer Patients After the Radioiodine Ablation

The radioactive iodine (I-131) ablation is a well-accepted treatment modality for differentiated thyroid cancer patients. Unfortunately, the radiation induces the oxidative stress and damages cells and tissues, simultaneously activating the mechanisms of antioxidative defense. Since the mechanisms of those processes are not completely known, we wanted to examine the changes in the most important reactive oxygen species and antioxidative components, as well as their correlation and significance for lipid peroxidation. Our results showed that the level of thiobarbituric acid reactive substances was increased during the first 30 days after the radiotherapy. Among antioxidant components, superoxide dismutase was increased in the 3rd and 30th day; catalase in 7th and reduced glutathione in 3rd and 7th day after the radiotherapy. As regards the prooxidants, the reduction of hydrogen peroxide (H2O2) was recorded in 7th and 30th day, and superoxide anion radical (O-2(center dot-)) was unchanged after the exposure to I-131. These results indicate that differentiated thyroid cancer patients are under constant oxidative stress despite the observed increase in antioxidative and reduction in prooxidative parameters. The understanding of these early processes is important since their progress determines the latter effects of I-131 therapy

Visual Laterality of Calf–Mother Interactions in Wild Whales

Behavioral laterality is known for a variety of vertebrate and invertebrate animals. Laterality in social interactions has been described for a wide range of species including humans. Although evidence and theoretical predictions indicate that in social species the degree of population level laterality is greater than in solitary ones, the origin of these unilateral biases is not fully understood. It is especially poorly studied in the wild animals. Little is known about the role, which laterality in social interactions plays in natural populations. A number of brain characteristics make cetaceans most suitable for investigation of lateralization in social contacts.) in the greatest breeding aggregation in the White Sea. Here we show that young calves (in 29 individually identified and in over a hundred of individually not recognized mother-calf pairs) swim and rest significantly longer on a mother's right side. Further observations along with the data from other cetaceans indicate that found laterality is a result of the calves' preference to observe their mothers with the left eye, i.e., to analyze the information on a socially significant object in the right brain hemisphere.Data from our and previous work on cetacean laterality suggest that basic brain lateralizations are expressed in the same way in cetaceans and other vertebrates. While the information on social partners and novel objects is analyzed in the right brain hemisphere, the control of feeding behavior is performed by the left brain hemisphere. Continuous unilateral visual contacts of calves to mothers with the left eye may influence social development of the young by activation of the contralateral (right) brain hemisphere, indicating a possible mechanism on how behavioral lateralization may influence species life and welfare. This hypothesis is supported by evidence from other vertebrates

Supplementary data for the article: Alrgei, H. O. S.; Dabić, D. C.; Natić, M. M.; Rakonjac, V. S.; Milojković-Opsenica, D.; Tešić, Z. L.; Fotirić Akšić, M. M. Chemical Profile of Major Taste- and Health-Related Compounds of Oblačinska Sour Cherry. Journal of the Science of Food and Agriculture 2016, 96 (4), 1241–1251. https://doi.org/10.1002/jsfa.7212

Supplementary material for: [https://doi.org/10.1002/jsfa.7212]Related to published version: [http://cherry.chem.bg.ac.rs/handle/123456789/2044

A cross-national study on the antecedents of work–life balance from the fit and balance perspective

Drawing on the perceived work–family fit and balance perspective, this study investigates demands and resources as antecedents of work–life balance (WLB) across four countries (New Zealand, France, Italy and Spain), so as to provide empirical cross-national evidence. Using structural equation modelling analysis on a sample of 870 full time employees, we found that work demands, hours worked and family demands were negatively related to WLB, while job autonomy and supervisor support were positively related to WLB. We also found evidence that resources (job autonomy and supervisor support) moderated the relationships between demands and work–life balance, with high resources consistently buffering any detrimental influence of demands on WLB. Furthermore, our study identified additional predictors of WLB that were unique to some national contexts. For example, in France and Italy, overtime hours worked were negatively associated with WLB, while parental status was positively associated with WLB. Overall, the implications for theory and practice are discussed.Peer ReviewedPostprint (author's final draft