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1.
Strukturna karakterizacija komercialnih reaktivnih barvil
1992, diplomsko delo

Ključne besede: reaktivna barvila, spektroskopija, kromatografija
Objavljeno: 26.07.2007; Ogledov: 1421; Prenosov: 0

2.
Copper and zinc accumulation in vineyard soils treated with Cu and Zn containing phytopharmaceuticals
Vesna Bukovac, 2010, izvirni znanstveni članek

Ključne besede: vineyard, soil, copper, zinc, phytopharmaceuticals
Objavljeno: 10.07.2015; Ogledov: 177; Prenosov: 2
URL Polno besedilo (0,00 KB)

3.
Innovative practices compendium
Vesna Bukovac, Nidal Shaban, Iman Mussa Kadhum, 2013

Objavljeno: 30.12.2015; Ogledov: 142; Prenosov: 5
URL Polno besedilo (0,00 KB)

4.
Sledenje onesnaženja s cinkom v ekosistemu vinograda
Vesna Bukovac, Mateja Muršec, 2017, znanstvena monografija

Opis: V monografiji je na zadosten in potrebno celovit način predstavljena problematika sledenja težke kovine – cinka, ki se v ekosistem vinograda vnaša z uporabo organokovinskih fitofarmacevtskih pripravkov. Cink je sestavni del aktivne komponente Antracol-a, ki se v vinogradništvu veliko uporablja kot kontaktni fungicid. Raziskava potrjuje, da je povečana vsebnost cinka v vinogradniških tleh v glavnem posledica dolgoletne uporabe organokovinskih fitofarmacevtskih pripravkov. Z osredotočanjem na problematiko tal v vinogradu, občutljivost ravnovesja v antropogeno spremenjenem ekosistemu, kemizem cinka v tleh ter nenazadnje tudi s smernicami za obnovo onesnaženih tal je v monografiji celostno zaobjet trajnostno naravnan pogled na obravnavano tematiko. Rezultati raziskave so primerjani z dognanji raziskovalcev v svetovnem prostoru zato so predstavljena znanja izrazito aktualna. Z zavedanjem o naravnem krogotoku vnesenih snovi v tla in prehajanju le-teh v prehranjevalno verigo, želi vsebina monografije nagovoriti cenjeni avditorij o pomembnosti sledenja onesnaženja v okolju in nujnosti takojšnjega ukrepanja.
Ključne besede: cink, fitofarmacevtska sredstva, onesnaženje tal, trajnostno kmetijstvo
Objavljeno: 30.05.2017; Ogledov: 237; Prenosov: 12
URL Polno besedilo (0,00 KB)
Gradivo ima več datotek! Več...

5.
Comparison of methods for determination of polyphenols in wine by HPLC-UV/VIS, LC/MS/MS and spectrophotometry
Vesna Bukovac, Matija Strlič, Drago Kočar, 2009, izvirni znanstveni članek

Opis: Phenolic antioxidants are usually grouped into flavonoids and non-flavonoids, according to their structure. With regard to the tannic character, phenolic antioxidants are further subdivided to tannic phenols and non-tannic phenols. Collectively, these compounds contribute to the high antioxidant capacity of wine. In this work, we compare determination of gallic acid, catechin, epicatechin, resveratrol, quercetin, dihydrobenzoic acid, sinapic acid, vanillic acid, caffeic acid, chlorogenic acid, ferullic acid, ellagic acid, p-coumaric acid and caftaric acid in 141 wine samples using two liquid chromatographic methods and detection systems, i.e. with UV detection and mass-spectrometric detection. In addition, we applied the conventional Folin-Ciocalteu spectrophotometric method for determination of the total phenolic content in wine samples and compared the results with those obtained using the chromatographic methods. Despite satisfactory correlations statistically significant differences between HPLC-UV/VIS and LC/MS/MS were established, which could be related to coelution not detectable with UV/VIS detectors. The correlations between results of the spectrophotometric method and sum of LC/MS/MS determinations are not satisfactory and are different for white, red, and rosé wines.
Ključne besede: food analysis, wine, antioxidants, chromatography
Objavljeno: 17.08.2017; Ogledov: 73; Prenosov: 0
.pdf Polno besedilo (185,67 KB)

6.
Distribution of zinc in vineyard areas treated with zinc containing phytopharmaceuticals
Vesna Bukovac, Danimir Kerin, 2000, izvirni znanstveni članek

Opis: Zinc concentration in vineyard soil is, in general, increased markedly by the long term application of zinc containing fungicides. The most significant source of Zn are nowadays dithiocarbamate based fungicides, e.g. Antracol. The concentration of total zinc and EDTA and ammonium lactate (AL) extractable Zn in soils are evaluated together with the concentration of Zn in different inorganic fertilizers and in fungicides. the results of the study indicate in the observed vineyard areas a long term accumulation of zinc appears. The study was made in vineyards of Kalvarija and Meranovo (Maribor, Slovenia).
Ključne besede: zinc, dithiocarbamate, soil
Objavljeno: 18.08.2017; Ogledov: 51; Prenosov: 0
.pdf Polno besedilo (108,83 KB)

7.
Chemical and fruit skin colour markers for simple quality control of tomato fruits
Vesna Bukovac, Tatjana Unuk, 2015, izvirni znanstveni članek

Opis: The orientation of this research was to evaluate the classic parameters regarding the external and internal quality of tomato fruits cv. ‘Brilliant‘ at different stages of maturity and to define the dynamics of their changes during the ripening in storage at 18 °C. Principal component analysis (PCA) and multivariate canonical discriminant analysis (DA) were used to classify tomato samples according to quality (internal and external) and nutritional value based on fruit mass, fruit skin colour, contents of soluble solids (SS), total titratable acids (TTA), ascorbic acid (AA), and total antioxidant potential (TAP). Several methods are usedfor determining AA content and TAP in plant samples. A simple routine method, direct redox titration with iodate solution and spectrophotometric determination of TAPSP, as described by Singleton and Rossi, also called total phenols, were used respectively. The results show that the stage of maturity (based on fruit skin colour) strongly determines the quality and nutritional value of the tomato fruit. Tomatoes harvested at table maturity (red colour, index a*/b* ≥ 0.85) have a significantly higher nutritional value (in terms of antioxidants – TAPSP and AA content) and overall quality than those harvested at an earlier maturity stage and then ripened in storage. This brings out the importance of short food supply chains and, from the viewpoint of overall fruit quality, it raises doubt about harvesting before reaching table maturity. On the other hand, it is necessary to be extremely attentive when determining optimal maturity, because when the plant becomes over-ripe or when stored, the nutritional value and overall quality decrease drastically. Besides the colour parameters, AA content is the most important chemical marker for a simple quality control. By using a simple and reliable analytical method for determining AA content, such as direct redox titratiation, the monitoring of tomato fruit quality could also be easily performed in situ.
Ključne besede: chemical markers, quality control, antioxidant, tomato, discriminant analysis
Objavljeno: 24.10.2017; Ogledov: 30; Prenosov: 1
.pdf Polno besedilo (489,58 KB)

8.
Business plan for a Zen garden
Maja Žibrat, Karmen Pažek, Vesna Bukovac, 2015, izvirni znanstveni članek

Opis: The placement of a theme park in the form of a Zen garden, as a business opportunity in the Slovenian rural area, is discussed. The design of the garden, with all the major points of a standard business plan, is accurately presented, with a description of the business, branch, and services, market analysis, marketing strategy, financial projections, and a plan of the work and activities. The financial aspect is presented as the amount of investment, net present value, and internal rate of return. The amount of investment is estimated at € 14.891, which should be reimbursed within 4 years of operations. The estimated internal rate of return is estimated at 16.86%. Part of the study is the market analysis - conduction of a survey into knowledge of, and interest in, Zen and Zen gardens. The principles of landscape ecology are respected, as the Zen garden would be set in the woods and will blend seamlessly into the landscape.
Ključne besede: theme parks, sustainable tourism, investment, financial indicators, landscape ecology
Objavljeno: 14.11.2017; Ogledov: 7; Prenosov: 0
.pdf Polno besedilo (219,69 KB)

9.
POSLOVNI NAČRT ZA ZEN VRT
Maja Žibrat, 2015, diplomsko delo/naloga

Opis: V diplomski nalogi je predstavljen poslovni načrt za zen vrt. V prvem delu je natančno predstavljena zasnova vrta z vsemi glavnimi sklopi standardnega poslovnega načrta: opis podjetja in panoge, opis storitve, analiza trga, strategija trženja, finančne projekcije ter načrt dela in aktivnosti, v drugem delu pa predstavljen finančni vidik. V tem delu so ocenjeni finančni parametri kot so višina investicije, neto sedanja vrednost, letni denarni tok in interna stopnja donosa. Višina investicije projekta je ocenjena na 14.890,70 €, povrnila pa naj bi se v 4 letih poslovanja. Ocenjena interna stopnja donosa ob povratku investicije je ocenjena na 16, 86 %. Del raziskave predstavlja tudi izvedba ankete o samem poznavanju in zanimanju za zen in zen vrt.
Ključne besede: zen vrt, poslovni načrt, investicija, neto sedanja vrednost
Objavljeno: 29.05.2015; Ogledov: 601; Prenosov: 111
.pdf Polno besedilo (1,00 MB)

10.
Proteini kot prehranski dodatki in njihova primerjava
Dejan Korat, 2016, magistrsko delo/naloga

Opis: V magistrskem delu smo predstavili proteinske dodatke in jih primerjali med seboj. Z anketnim vprašalnikom, katerega so izpolnjevali športniki in drugi anketiranci, smo raziskovali, kakšen odnos imajo anketiranci do proteinskih dodatkov in kako so o njih ozaveščeni. Ugotovili smo, da športniki pogosteje uporabljajo prehranske dodatke kot drugi anketiranci in jih tudi bolje poznajo. Da je kvaliteta pomembna, se zavedajo vsi anketirani, so pa premalo ozaveščeni, da je nakup preko spleta tvegan. Na podlagi raziskav v laboratoriju smo pridobili informacije glede sestave proteinskih dodatkov in te primerjali s podatki, navedenimi na ovojnini. Zanimal nas je delež beljakovin, sladkorja in vlaknin v šestih proteinskih dodatkih. Ugotovili smo, da pri vsebnosti beljakovin glede na deklaracijo precej odstopajo štirje od šestih analiziranih vzorcev. Pri analizi sladkorjev najbolj odstopata dva vzorca. Na osnovi primerjav smo ugotavljali ceno glede na vsebnost odstotkov beljakovin v proteinskih dodatkih. Največji delež beljakovin je imel sirotkin proteinski dodatek Whey 20 športni izolat. Njegova cena je bila 36 €/kg. Pri kazeinskem proteinskem dodatku je imel največji delež beljakovin QNT protein casein 92, zanj pa je bilo potrebno odšteti 32 €/kg. Največji delež beljakovin v sojinem proteinskem dodatku je imel Pro 10 soj isolat. Cena tega dodatka je bila 14 €/kg. Največji delež beljakovin v konopljinem proteinskem dodatku je imel Muscle & Strength hemp protein, njegova cena pa je bila 25 €/kg. Primerjali smo tudi sestavine med proteinskimi dodatki. Sirotkini in sojini proteinski dodatki so na obrok (30 g) v povprečju vsebovali največ beljakovin. Najmanj beljakovin pa so vsebovali konopljini proteinski dodatki.
Ključne besede: proteinski dodatki, beljakovine, sladkor, vlaknine, ovojnina
Objavljeno: 25.03.2016; Ogledov: 391; Prenosov: 140
.pdf Polno besedilo (1,39 MB)

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