The paper investigates the ways in which schools can contribute to the prevention of bullying, by gaining insight into a multi-layered structure of school activities that contributes to the positive ...effects of educational work on the development of students' personality and by pointing to the three levels of preventive action that can be carried out on an individual basis (universal, selective, and indicated prevention). Special emphasis is placed on universal prevention, given that science has proved that some school subjects (mother tongue and/or foreign language and literature, history, civic education, religious instruction, art and music lessons) and the extra-curricular activities related to them provide opportunities for this kind of bullying prevention. Focusing on literature instruction, we first look at its pedagogical role, linking the issue of bullying to humanistic and moral education. Literary texts that thematise this issue are very convenient for developing students' socio-emotional competencies, the competencies that are (also) directly linked to attitudes towards bullying and other forms of violence. "Deca" (Children), a short story by Ivo Andrić, stands out among such works represented in the literature curriculum for primary school. By applaying the emphatic-ethical model of reading, we investigate the pedagogical potential of this literary text, trying to point out the key "action" segments in the text which are activated only by a teacher's adequate methodological guidance of students during its collective interpretation.
The chemical composition of the essential oil and the volatiles obtained by static headspace (HS) of Inula oculus-christi L. is presented. The GC-MS analysis of the hydrodistilled oil resulted in the ...identification of 90 components, representing 92.7% of the oil. The most abundant compounds were: caryophyllene oxide (9.8%), trans-longipinocarveol (9.2%), eucalyptol (7.3%) and intermedeol (6.2%). The major constituent of I. oculus-christi L. HS volatiles was eucalyptol (87.4%). The antioxidant activity was evaluated by four different methods: 2,2-diphenyl-1-picryl-hydrazylhydrate free radical assay (DPPH), 2,2-azino-bis-3-ethylbenzothiazoline-6-sulfonic acid (ABTS) method, total reducing power (TRP), ferric reducing antioxidant power (FRAP), and cupric reducing antioxidant capacity (CUPRAC). Total phenolic content in (TPC) examined oil was 177.95 µg GAE/mg oil. Radical scavenging potential of the oil was promising RSC-DPPH was 57.4% and RSC-ABTS was 82.7%.
Modified phillipsite samples were prepared with two different amounts (monolayer and bilayer coverage) of surfactants octadecyldimethylbenzylammonium chloride (O) and dodecylamine (D). Composites ...were characterized by Fourier transform infrared spectroscopy with attenuated total reflectance (FTIR–ATR), thermal analysis and determination of zeta potential, and subsequently tested for removal of diclofenac sodium (DCF). Drug adsorption experiments were performed under different initial DCF concentrations and different contact times. In order to investigate the influence of the chemical structure of surfactants used for modification of phillipsite on the preparation and properties of composites and DCF adsorption, experimental data were compared with previously published results on DCF adsorption by composites containing phillipsite and the same amounts of surfactants cetylpyridinium chloride (C) and Arquad®2HT-75 (A). DCF adsorption isotherms for O and D composites showed a better fit with the Langmuir model with maximum adsorption capacities between 12.3 and 38.4 mg/g and are similar to those for C and A composites, while kinetics run followed a pseudo-second-order model. Composites containing either benzyl or pyridine functional groups showed higher adsorption of DCF, implying that surfactant structure has a significant impact on drug adsorption. Drug adsorption onto O, D, C and A composites was also confirmed by FTIR–ATR spectroscopy and zeta potential measurements.
The effects of graded sodium chloride (NaCl) concentrations (0-, 50-, 100-, 150-, and 200-mM) on photosynthetic pigment contents in in vitro grown shoots of important medicinal plant species ...(Centaurium erythraea Rafn) were investigated. Non-transformed, one AtCKX1 and two AtCKX2 transgenic centaury lines, with altered cytokinin profiles, were used in this study. The chlorophyll (Chl) and carotenoid contents differed in the non-transformed and transgenic lines. In general, salinity significantly reduced the Chl a and Chl b contents in comparison to the NaCl-free medium. The lowest Chl content was observed in AtCKX2 transgenic shoots grown on all the culture media. The total carotenoid content was increased in shoots of non-transformed and both AtCKX2 transgenic lines grown in 50-mM NaCl. On the other hand, in concentrations >50-mM NaCl, the total carotenoid content was decreased in all analysed centaury shoots. The Chl a/Chl b ratio in all the shoots increased progressively in the graded NaCl concentrations. Contrarily, the addition of NaCl in the culture medium reduced the Chl/carotenoid ratio in centaury shoots. Taken together, the results of this study partly explained the mode of centaury plant adaptations to salt stress in vitro. Thus, the results on centaury shoots confirmed that the determination of the photosynthetic pigment contents can be a very useful non-destructive screening method in order to discriminate susceptible and resistant plant species/lines to salt stress conditions.
The aim of the present study was a chemical and chemometric analysis of Satureja kitaibelii Wierzb. ex Heuff. essential oil during different stages of development, with emphasis on chemotaxonomy. The ...most abundant compound class in the S. kitaibelii oil during examined phenological stages was oxygenated monoterpenes (21.3-61.2%), except vegetative stage, in which monoterpene hydrocarbons are dominant (51.1%). Geraniol, limonene, p-cymene and borneol are the most abundant compounds of essential oil during different stages of development. The highest variation in content, during plant development, was shown by the most dominant component, geraniol (coefficient of variation 112.3%). Chemometric analysis indicated two chemotypes: limonene/p-cymene/geraniol and limonene/p-cymene/borneol. We are of the opinion that the three most abundant EO components should determine the chemotype. Our results lead to the conclusion that essential oil isolated from the plant in 1 month should not be used to determine the chemotype.
Ethnoveterinary knowledge in Pirot County (Serbia) Marković, Marija S.; Pljevljakušić, Dejan S.; Nikolić, Biljana M. ...
South African journal of botany,
March 2021, 2021-03-00, 20210301, Letnik:
137
Journal Article
Recenzirano
•The local inhabitants of Pirot County in Eastern Serbia were interviewed about plant's application in veterinary ethnopharmacology.•It was noticed 46 veterinary plants and 206 use reports.•It was ...found 22 plants not mentioned and 9 plants with different use in neighboring regions.•A good starting point for new phytopharmacological studies.
This paper provides essential information on medicinal plant uses in the veterinary ethnopharmacology of Pirot County in Eastern Serbia, known as a relatively isolated, multiethnic, and a traditional agricultural area. The aim of the study was to collect, analyze, and evaluate the medicinal plants' ethnoveterinary knowledge in a Pirot County (2761 km2, total 92,479 inhabitants, of which 34,672 in the rural area). The local inhabitants of the rural area were interviewed by a semi-structured questionnaire to determine how many of them are familiar with the plants' application in veterinary ethnopharmacology. Interviews were conducted in four municipalities of the Pirot County, where the samples of the local rural population included 631 respondents (mean age 50; 45.59% women, 53.41% men) at 144 sites, of which 148 respondents from 92 villages reported the use of plants in veterinary medicine. The data are presented in a tabular manner and include scientific and local names, the part used, pharmaceutical form, therapeutic indication, and mode of administration, followed with several reports. Furthermore, most frequently reported taxa are systemized for each therapeutic group municipality-wise with calculated informant consensus factor. A comparison with previously published data collected from surrounding territories on the Balkan Peninsula was performed by considering the Jaccard index. The survey revealed 192 plants used by the local population for various health indications, of which 46 species were reported for use in veterinary medicine. Plants reported for the treatment of health issues in livestock (206 reports) were distributed in 30 families out of which the main ones being Asteraceae (8 species), Lamiaceae (4 species), Rosaceae (4 species) and the most abundant were Asteraceae (43 reports), Hypericaceae (28 reports), Polygonaceae (26 reports) and Ranunculaceae (23 reports). The most frequently used plants in veterinary ethnopharmacology were Cichorium intybus, Hypericum perforatum, and Rumex patientia. Aerial plant parts were exploited more frequently than underground parts. The mode of administration was primarily oral in the water extract form. The primary reported therapeutic groups were diarrhea (98 reports), wounds (27 reports), dermatological diseases (scabies and pediculosis) (14 reports), and elevated temperature (10 reports). The use of 22 plant species was not reported in other ethnoveterinary surveys in the Balkan Peninsula. Knowledge of plants for veterinary use is still constrained among the population of the rural parts of Pirot County. The study identified plant species used by the local population to deal with health issues in domestic animals. The presented findings of this study can be a good starting point for new phytopharmacological investigations in the veterinary domain.
In ornamental geophytes, conventional vegetative propagation is not economically feasible due to very slow development and ineffective methods. It can take several years until a new plant is formed ...and commercial profitability is achieved. Therefore, micropropagation techniques have been developed to increase the multiplication rate and thus shorten the multiplication and regeneration period. The majority of these techniques rely on the formation of new bulbs and their sprouting. Dormancy is one of the main limiting factors to speed up multiplication in vitro. Bulbous species have a period of bulb dormancy which enables them to survive unfavorable natural conditions. Bulbs grown in vitro also exhibit dormancy, which has to be overcome in order to allow sprouting of bulbs in the next vegetation period. During the period of dormancy, numerous physiological processes occur, many of which have not been elucidated yet. Understanding the process of dormancy will allow us to speed up and improve breeding of geophytes and thereby achieve economic profitability, which is very important for horticulture. This review focuses on recent findings in the area of bulb dormancy initiation and release in fritillaries, with particular emphasis on the effect of plant growth regulators and low-temperature pretreatment on dormancy release in relation to induction of antioxidative enzymes' activity in vitro.
The genus Fritillaria is characterized by the production of alkaloids, primarily of the isosteroidal type. The aim of this preliminary study was to perform a histolocalization screening aimed at ...revealing the presence of alkaloids in the bulbs of F. meleagris, cultured in vitro under different growth regimes and at different developmental stages, as a powerful tool to identify preferable in vitro plant material for alkaloid isolation. Histochemical localization of alkaloids was performed using Wagner’s and Dragendorff’s reagents in fresh sections of bulbs cultured at 24 °C or 7 °C for 4 weeks, as well as those cultured at 24 °C following the 4-week chilling treatment, which were sampled at the beginning of sprouting. A positive reaction was observed with both reagents and was particularly intense in cold-treated bulbs. Alkaloids were mainly distributed in the bulbs and partly in the sprouts of the in vitro grown F. meleagris. The most intense staining, indicative of high alkaloid content, was observed in the bulb scales of pre-chilled bulbs that sprouted at 24 °C, rendering them preferable as in vitro plant material for alkaloid isolation. The results suggest that alkaloid production in the bulbs of F. meleagris can be improved by manipulating growth in the microenvironment of in vitro cultures, in order to meet the increasing industrial demand for medicinally or commercially important metabolites used as traditional medicines and herbal remedies.
Fritillaria meleagris is a horticulturally and medicinally valuable bulbous plant that requires a period of low temperatures for proper growth and flowering. Since conventional methods of propagation ...are ineffective and very slow, tissue culture techniques offer an integrated approach to mass production of this valuable geophyte. In this study, we investigated the effects of various auxin–cytokinin combinations on different morphogenetic pathways in bulb scale culture. Bulbs obtained in vitro were cut longitudinally, and bulb scales were cultured for four weeks at 7 °C on MS medium supplemented with 6-benzylaminopurine (BAP) in combination with 2,4-dichlorophenoxyacetic acid (2,4-D) or α-naphthaleneacetic acid (NAA) at different concentrations in order to investigate the influence of plant growth regulators (PGRs) on different morphogenetic responses. Regeneration percentage, number of shoots per explant, shoot length, number of bulbs and number of somatic embryos were monitored weekly. After chilling, bulb scales were transferred to 24 °C, and all parameters were recorded again. Low PGR concentrations were very effective for shoot multiplication, yielding up to 5.5 shoots per explant. 2,4-D (at 2 mg/L) in combination with low BAP (0.25 mg/L) produced the highest number of bulbs (11.00 ± 0.00), while PGR-free medium was extremely effective in somatic embryo formation (13.50 ± 2.90). Detached somatic embryos and bulblets continued to grow and develop on fresh PGR-free medium. We present data demonstrating that low auxin–cytokinin concentrations and PGR-free medium provide an effective method for a combined morphogenetic pathway in F. meleagris that is suitable for large-scale propagation.
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