Poređenje parametara kvaliteta nepiliranog i novostvorenog piliranog semena zelene salate

Lettuce is one of the most common types of leafy vegetables in human diet that is grown worldwide. Narrow and very small seeds make its sowing very difficult, requiring a lot of time and labour. Also, plants produced by manual sowing are often characterized by uneven germination. Those problems could be prevented by sowing pelleted seeds which require the development of adequate pelleting technology. Absence of quality lettuce seeds in the Serbian market results in large amounts of imported pelleted seeds every year. The aim of this study was to develop a domestic pelleting procedure and examine its effects on seeds quality parameters, in order to provide seeds to local farmers at a more affordable price compared to imported commercial pelleted seeds. Pelleted and non-pelleted seeds of the Panukia F1 hybrid were compared in several quality characteristics (1000 seed weight, germination energy, germination percentage, seedling length) in laboratory and greenhouse conditions. There was no loss in seed quality with the pelleting process, although the seed weight increased 12-19 times. Pelleted lettuce seeds had very high germination energy and seed germination (97-98%). In greenhouse conditions, non-pelleted seeds sprouted unevenly in relation to pelleted seeds. These results confirm the advantages of sowing pelleted seeds in terms of uniform germination and development of lettuce plants, primarily due to the precision of mechanical sowing. By offering domestic pelleting lettuce seeds to the growers, the production process would be significantly improved and accelerated with the reduction of manual labour, and therefore the overall production costZelena salata je među najzastupljenijim vrstama lisnatog povrća u ljudskoj ishrani koja se uzgaja širom sveta. Nedostatak kvalitetnog semena zelene salate na srpskom tržištu uzrokuje uvoz velikih količina piliranog semena svake godine. Usko i veoma sitno seme otežava setvu i zahteva mnogo vremena i rada. Takođe, biljke proizvedene ručnom setvom semena često se odlikuju neujednačenim nicanjem. Ovi problemi mogu se sprečiti setvom piliranog semena što zahteva razvoj adekvatne tehnologije piliranja. Cilj ovog istraživanja bio je da se razvije domaći postupak piliranja semena zelene salete i da se ispita njegov uticaj na parametre kvaliteta semena kako bi se lokalnim poljoprivrednim proizvođačima obezbedilo seme po pristupačnijoj ceni u odnosu na uvozno pilirano seme. Pilirano i nepilirano seme hibrida Panukia F1 poređeno je u nekoliko parametara kvaliteta (masa 1000 semena, energija klijanja, procenat klijavosti, dužina ponika) u laboratorijskim uslovima i proizvodnim uslovima u stakleniku. Piliranje nije uticalo na gubitak kvaliteta semena iako je masa semena piliranjem povećana od 12 do 19 puta. Pilirano seme zelene salate imalo je veoma visoku energiju klijanja i klijavost semena (97-98%). U proizvodnim uslovima u stakleniku, nepilirano seme je nicalo neujednačeno u odnosu na pilirano seme. Ovi rezultati potvrđuju prednost setve piliranog semena u pogledu ujednačenijeg nicanja i razvoja biljaka, prvenstveno zbog preciznosti setve piliranog semena. Ponudom domaćeg piliranog semena zelene salate proizvođačima značajno bi se unapredio i ubrzao proces proizvodnje uz smanjenje ručnog rada, a samim tim i ukupnih troškova proizvodnje

Application of Fuzzy Theory for Water Quality Assessment

U radu se razmatra mogućnost primene teorije fazi skupova za određivanje kvaliteta vode na osnovu mikrobioloških parametara. U razmatranje je uključeno pet osnovnih mikrobioloških parametara: ukupan broj bakterija, broj aerobnih heterotrofa, fekalni koliformi, hlorofil-a i indeks fosfatazne aktivnosti. Predložene (ili definisane) su fazi funkcije za određivanje pripadnosti parametara klasama kvaliteta vode, kao i metod za određivanje fmWQI (fazi mikrobiološki Water Quality Index). Na osnovu vrednosti ovog indeksa određuje se klasa kvaliteta kojoj pripada vodeni ekosistem.Application of fuzzy theory for water quality assessment using the microbiological parameters is presented in the paper. Five parameters are included: total number of bacteria, number of heterotrophs, Escherichia coli, concentration of chlorophyll a and intensity of phosphatase activity. Fuzzy functions for determining the degrees of memberships for the water quality parameters are defined, as well as the methodology for estimating fmWQI (fuzzy microbiological Water Quality Index). On the base of this index, water classes can be determined

The importance of prices in tourism industry: The impact of growth of prices of hospitality services on the domestic tourism demand

Practice has shown that prices, an important economic factor, have a significant effect on the choice of tourist destination, i.e. they have a direct impact on the tourism demand and add to its elasticity. More often than not, the connection between the 'prices in the hospitality industry and tourism demand dynamics' is not a simple one. Many various factors besides prices in the hospitality industry influence the decision on a tourism trip, rendering this connection very complex. The effect of prices on domestic tourism demand is particularly evident in developing countries with low avarage salaries. To be better able to objectively perceive the effect of price growth in the hospitality industry, in addition to the basic parameters (prices in hospitality services, domestic arrivals and overnight stays of domestic tourists), we also analysed the cost of life, average salaries and changes in the euro exhange rate. All the parameters are for Serbia and they cover a period of fifteen years, 2002-2016. The principal method used in the research is the statistical method of linear correlation analysis, where the linear correlation coefficient was taken as an indicator

TOURISM WEBSITES CHARACTERISTICS IN A COUNTRY WITH SMALL INTERNET USE - CASE STUDY OF SERBIA

<span>Web is the powerful tool for tourism industry in economically developed countries. That mostly implies high website quality, use of Internet promotion techniques and good management of website distribution elements. However, what kinds of tourism websites characteristics are present in a country with small development and small use of Internet, such as Serbia? Serbia connected to Internet in 1996, and two years later first websites related to tourism subjects appeared, but still has small Internet penetration rate. Many companies in travel industry from developing countries use websites, but not in the right way. The purpose of this paper is to examine and show present tourism websites characteristics in term of its credibility, presentation and type of website content, visibility and search engine rank. The main method used in this research is structural observation of domestic 260 travel websites in Serbia. The results have pointed to the negative websites characteristics and inadequate use of its possibilities in tourism sector in Serbia.</span

Antioxidant, Antimicrobial and Antiproliferative Activities of Five Lichen Species

The antioxidative, antimicrobial and antiproliferative potentials of the methanol extracts of the lichen species Parmelia sulcata, Flavoparmelia caperata, Evernia prunastri, Hypogymnia physodes and Cladonia foliacea were evaluated. The total phenolic content of the tested extracts varied from 78.12 to 141.59 mg of gallic acid equivalent (GA)/g of extract and the total flavonoid content from 20.14 to 44.43 mg of rutin equivalent (Ru)/g of extract. The antioxidant capacities of the lichen extracts were determined by 2,2-diphenyl-1-picrylhydrazyl (DPPH) radicals scavenging. Hypogymnia physodes with the highest phenolic content showed the strongest DPPH radical scavenging effect. Further, the antimicrobial potential of the lichen extracts was determined by a microdilution method on 29 microorganisms, including 15 strains of bacteria, 10 species of filamentous fungi and 4 yeast species. A high antimicrobial activity of all the tested extracts was observed with more potent inhibitory effects on the growth of Gram (+) bacteria. The highest antimicrobial activity among lichens was demonstrated by Hypogymnia physodes and Cladonia foliacea. Finally, the antiproliferative activity of the lichen extracts was explored on the colon cancer adenocarcinoma cell line HCT-116 by MTT (3-[4,5-dimethylthiazol-2-yl]-2,5-diphenyltetrazolium bromide) viability assay and acridine orange/ethidium bromide staining. The methanol extracts of Hypogymnia physodes and Cladonia foliacea showed a better cytotoxic activity than the other extracts. All lichen species showed the ability to induce apoptosis of HCT-116 cells

State, planning and design of Jodna spa in Novi Sad

The paper treats the area of Jodna spa in Novi Sad, which largely coincides with Futoški park, making with it the indissoluble unity. The main problem in the functioning of the Jodna psa is the fact that in legal sense Jodna spa does not exists, and in spatial sense there are still all of its content. The case of the paper is Jodna spa area, which includes the Special Hospital for Rheumatic Diseases, Hotel 'Park', Sports Center 'Sajmište' and Futoški park, which integrate them. The question of the Jodna spa planning, as well as the modern city recreation, spa and tourist center, is the goal of this paper. For this purpose it was necessary to show the historical background of the development of Jodna spa, to make the assessment of the state, critically analyze spatial plans which treat it and provide concrete suggestions for its design and equipping

Microbiological index of water quality (mWQI) tested on the Gruza reservoir

The present paper considers formulation of a criterion for estimation of water quality from microbiological parameters (mWQI) based on comparison with WQI using certain elements of fuzzy logic on the example of the Gruza Reservoir. Quantitative estimation of water quality from five important microbiological parameters, the microbiological water quality index (mWQI) is realized using the proposed simple procedure. In view of the fact that the bulk of analyzed water samples belonged to class II, in future investigations the present method will be tested on lakes and reservoirs with a different degree of quality dispersion

Menadžment znanja i upravljanje inovacijama kao izvor poslovnog uspeha i konkurentske prednosti preduzeća

Novo stanje društva zasnovano je na sposobnosti da se stvori novo znanje i da se kroz inovacije proizvoda, usluga i procesa, transformiše u ekonomsku vrednost i bogatstvo. Upravljanje znanjem predstavlja jedan od najefikasnijih načina za poboljšanje rezultata poslovanja u organizacijama.Takođe potrebno je povećati i stimulisati inovacije kako bi se održao korak sa konkurencijom. U radu se bavimo analizom ova dva koncepta upravljanja: znanjem i inovacijama. Dinamičnost oba faktora je nesumnjiva. Sve više se govori ne o menadžmentu znanja već o razvoju znanja. S druge strane svaka inovacija već momentom njene primene počinje da zastareva. Pored aktuelnosti ova tematika je zasnovana na povezanosti između znanja i veštine da se uoče mogućnosti i kreiraju novi načini da se te mogućnosti iskoriste kroz inovacione procese. Krajnji cilj ove implementacije je poslovni uspeh, odnosno konkrentska prednost

Pilirano seme zelene salate - praktično rešenje za izvođenje precizne mašinske setve

Ovo tehničko rešenje je na 11. redovnoj sednici Matičnog naučnog odbora za biotehnologiju i poljoprivredu, održanoj 23.11.2022 godine, svrstano u kategoriju M82

Ecological variability of the phenolic compounds of Olea europaea L. leaves from natural habitats and cultivated conditions

Many compounds from the phenolic group, flavonoids in particular, are well-known antioxidants, although their role in plant response to stress is debatable. The aim of this study was to determine the variability of the phenolic content and the antioxidant activity of Olea europaea leaf samples from different habitats. The determination included measurement of the total quantity of phenolics, the flavonoid content, as well as the antioxidant activity of the two types of methanolic leaf extracts of O. europaea from several natural habitats in the Mediterranean region (Tunisia, Malta and Montenegro) and from cultivated conditions (France and Serbia). The results showed that both the total quantity of phenols and flavonoids as well as the intensity of antioxidant activity in the two types of extracts largely depended on the type of habitat. The total quantity of phenols and flavonoids was greater in the samples from cultivated plants which demonstrated the significance of certain conditions in terms of the correlation between the intensity of primary and secondary metabolism. However, the values of antioxidant activity in both types of extract were higher in the samples from natural habitats. The results showed that plants from natural habitats contain secondary metabolites with high biological activity. It could be speculated that these active substances play an important role in the adaptation of plants to the stress caused by arid conditions