32 research outputs found
Microbiological and keeping quality of pasteurized milk in the different conditions
No full textNa promjenu kvalitete pasteriziranog mlijeka mogu uticati mnogobrojni faktori. Bitnu ulogu ima temperatura na kojoj je mlijeko skladišteno po pasterizaciji odnosno ambalažiranju. Temperatura i vrijeme skladištenja mlijeka u mljekarama i prodavaonicama obično nisu najpovoljniji i zbog toga dolazi do promjena ukusa i mirisa pasteriziranog mlijeka, a posebno takvog mlijeka koje je bilo prerađeno iz nekvalitetnog sirovog mlijeka
Mogućnost korištenja sirutke u proizvodnji fermentiranih napitaka
No full textZnačaj sirutke u vezi sa njenim korištenjem u prehrambene svrhe ljudi postaje u zadnjim godinama na području Jugoslavije sve veći. Znamo da sirutka nije više tretirana kao otpadni produkt mljekarske industrije nego kao prateći proizvod sa velikom nutritivnom vrijednošću
Kvaliteta sireva na slovenskom tržištu
No full textSir predstavlja sa gledišta ishrane visokovrijednu živežnu namirnicu, a posebno značajne su bjelančevine kojih ima prema literaturnim podacima u siru oko 18-34 %. Količina bjelančevina značajno zavisi od količine masti ili vode. Kod manjih količina masti ima u siru više bjelančevina. Tako predstavljaju posni sirevi bogat izvor bjelančevina a istovremeno i živežnu namirnicu sa malo kalorija. Osim bjelančevina nalaze se u siru još i vitamini A, B, D, E i K te minerali, od kojih su posebnog značaja kalcij i fosfor. Spomenuti je potrebno još i mast koja je vrlo lako probavljiva, a ima i značajan utjecaj na ukus sira
Problematika standardizacije u oblasti mljekarstva SR Slovenije
No full textStandardizacija bilo analitičkih postupaka bilo kvaliteta proizvoda u oblasti mljekarstva pitanje je saveznog značaja. Prema tome se za Sloveniju problem ne može ni tretirati ni prikazati izolirano. Vjerojatno su problemi i nastojanja za njihovo rješavanje slični u cijeloj SFRJ
Researches in the activity of pure and mixed cultures Lactobacillus bulgaricus and Streptococcus thermophilus in enzymatically hydrolyzed milk
No full textProučavali smo utjecaj enzimatski razgrađene laktoze enzimom beta-galaktozidazom (Maxilact LX 5.000) na aktivnosti čistih i miješanih kultura Lbc. buigaricus i Str. thermophilus. Aktivnost kultura smo utvrđivali na osnovi vremena koagulacije, tvorbe mliječne kiseline, porasta broja mikroorganizama pojedinih kultura pri temperaturi 42 °C u postfermentacijskom razdoblju pri temperaturi 6 °C. Utjecaj enzimatski razgrađene laktoze u mlijeku na povećanu aktivnost kulture bilo je moguće točno odrediti samo u čistim kulturama Str. thermophilus.The effect of enzymatically disintegrated lactose by the enzyme beta-galactosidase (Maxilact LX 5000) on the activity of pure and mixed cultures Lbc. bulgaricus and Str. thermophilus was studied. The cultures' activity was determined on the basis of the duration of coagulation, formation of lactic acid and increase of the number of microorganisms of separate cultures at the temperature of 42°C and in the postfermentational period at the temperature of 6°C. The effect of enzymatically disintegrated lactose in milk on the increased activity of the culture could be determined more definitely only with pure cultures of Str. thermophilus
INVESTIGATION ON THE NUMBER AND SIZE OF THE LEAVES IN SOME OLD DOMESTIC AND NEW TOBACCO VARIETIES IN THE REPUBLIC OF MACEDONIA
No full textInvestigations were carried out with five old domestic oriental tobaccos of the types: Prilep (P 10–3/2 and P 12–2/1), Djebel (Dj №1) and Yaka (YK 7–4/2 and KY)and five commercial oriental varieties of Prilep tobacco (P–23, P–84, NS–72, P–66–9/7 and P–79–94), to study the number, length, width and area of the middle belt leaves per stalk. The trial was set up inthe Experimental field of Tobacco Institute–Prilep in 2013 and 2014, in randomized block design with three replications, using traditional agricultural practices. The aim of the investigation is to study some autochthonous varieties and new commercial varieties for the stated quantitative traits, and with analysis of variance to estimate the significance of differences by varieties and years, which will improve our knowledge on stability of the traits, genotypical homogeneity and progress in selection of oriental tobacco in the Republic of Macedonia. Differences in leaf the number and size among genotypes in the two-year investigations are highly significant, which is genetic indicator of their mutual differences. The error of the mean value is low, indicating stability and homozygosity of the genotypes. The variety P–66– 9/7 is characterized with the highest number of leaves (x= 60) and it has 33 leaves more than YK 7– 4/2 and Dj №1. The largest leaf size was measured in P–79–94 (x= 23,3cm – length, 12,1 cm – width, 179 cm2–area). It has 4,8 cm longer, 3,2 cm wider and 74,5 cm2 larger leaves then YK 7–4/2, which is characterized by the smallest leaves. These data point out to a successful breeding activity of the Tobacco Institute in the selection of oriental aromatic tobaccos. Through evaluation of stability of varieties, the breeder improves its knowledge ontheir homozygosity and higher security in the choice of parental pairs for implementing selection programs
A 4D tomographic ionospheric model to support PPP-RTK
No full textSuccessful implementation of integer ambiguity resolution enabled precise point positioning (aka PPP-RTK) algorithms is inextricably linked to the ability of a user to perform near real-time positioning by quickly and reliably resolving the integer carrier-phase ambiguities. In the PPP-RTK technique, a major barrier to successful ambiguity resolution is the unmodelled impact of the ionosphere. We present a 4D ionospheric tomographic model that computes in real time the ionospheric electron density as a linear combination of basis functions, namely B-splines. The results show that when the ionospheric estimates are provided as atmospheric corrections for a PPP-RTK end-user, the time to fix its horizontal position below 10 cm is around 20 epochs (the sample rate is 30 s) at the 90 % of the cumulative distribution function (CDF), as opposed to the time it takes when no external corrections are provided, which is around 80 epochs at 90 % of the CDF.Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Mathematical Geodesy and Positionin
Oxydation anodique du titane en solution sulfurique : nature, épaisseur et indice de réfraction des films formés
No full textOn étudie les films formés par polarisation anodique du titane en solution sulfurique. Leur épaisseur varie linéairement avec la tension anodique et on a déterminé l’influence des paramètres électrochimiques sur la loi de croissance. On suit l’évolution de l'état de cristallisation de l’oxyde grâce à la diffraction électronique ; il y a en effet un passage progressif d’une forme quasi-amorphe, pour les faibles tensions anodiques et les temps de maintien courts, à une forme ana- tase bien cristallisée lorsque la tension anodique atteint plusieurs dizaines de volts, et pour des temps de maintien suffisamment longs. L’emploi d’une méthode spectroréflectométrique permet de déterminer l'indice de réfraction de ces films entre 0,4 et 2 μm. On interprète les résultats par l’intervention des ions sulfate au cours de la dissolution anodique
Oxydation anodique du titane en solution sulfurique : nature, épaisseur et indice de réfraction des films formés
No full textInternational audienceWe study the films grown by anodic polarization of titanium in sulfuric solution. Their thickness is a linear function of the anodic voltage, and we determine the influence of electrochemical parameters on the growth law. We study the evolution of the crystallization state of the oxide by electron diffraction; wc show a gradual transition between an almost amorphous structure for the low anodic voltages and the short polarization times and a well crystallized anatase structure, when the anodic voltage reaches several tens volts, and for polarization times long enough. The use of a spectrorectometric method allows to obtain the value of the refractive index these films, between 0,4 and 2 μm. We explain the results by the interference of sulfate ions during the anodic dissolution.On étudie les films formés par polarisation anodique du titane en solution sulfurique. Leur épaisseur varie linéairement avec la tension anodique et on a déterminé l’influence des paramètres électrochimiques sur la loi de croissance. On suit l’évolution de l'état de cristallisation de l’oxyde grâce à la diffraction électronique ; il y a en effet un passage progressif d’une forme quasi-amorphe, pour les faibles tensions anodiques et les temps de maintien courts, à une forme ana- tase bien cristallisée lorsque la tension anodique atteint plusieurs dizaines de volts, et pour des temps de maintien suffisamment longs. L’emploi d’une méthode spectroréflectométrique permet de déterminer l'indice de réfraction de ces films entre 0,4 et 2 μm. On interprète les résultats par l’intervention des ions sulfate au cours de la dissolution anodique
