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Pork meat (m. longissimus dorsi) was treated with high pressure of 100, 200, 300 and 400 MPa. The pressure was applied for 10 minutes at room temperature. The concentration of hydrogen ions increased by 0.2 units within the pressure range of 300 and 500 MPa. The application of 300 and 400 MPa resulted in the increase of drip loss and contributed to the decrease in free water content compared to the control sample. All tested pressures caused a decrease in added water and thermal drip. The changes of these parameters strengthened with the increase of pressure applied. Pressures between 100 and 200 MPa slightly brightened the meat color but significant changes of this parameter began at 300 MPa. The greatest increase in color brightness and the largest share of the denatured myoglobin were observed following the application of 400 MPa.
The purpose of the research was to determine the effect of diversified nitrogen fertilization (0, 25 and 50 kg·ha-1) on selected properties of grains, malts and brewing worts. Brewing value of barley grain was determined by Molina-Cano method. It was stated that the higher doses of nitrogen caused an increase of yield, as a result of stronger productive tillering of plants. Significant growth of grain yield was obtained by the increasing of nitrogen fertilization from 25 to 50 kg·ha-1. Malts from naked barley grain were produced in the same way as malts of the Pilzen type. According to Molina-Cano method, the naked barley grain of Rastik cultivar was qualified as brewing, because of high malt extractivity. Laboratory worts were characterized by a high extract content, but not suitable viscosity, total attenuation and low soluble nitrogen content
Investigations were performed on meat originating from 22 carcasses of wild boars ripening in temperature 4 - 6°C during 12 days. During ripening process determinations of selected technological proprieties have been conducted. During long period of ripening low pH value which affected small changes of water holding ability and thermal drip was observed. Investigating tenderness of meat an essential improvement between 1st and 6th day of ripening was found. To summarize obtained results it can be concluded , that in spite of long ripening of wild boars carcasses only slight changes of technological properties of meat were observed.
Wood has been considered as a source of biomass and valuable technological material of beneficial ecological properties.
W pracy przedstawiono ocenę wpływu modyfikacji systemu nawożenia buraków cukrowych na zawartość sacharozy, technologiczny plon cukru, współczynnik alkaliczności i teoretyczny wydatek cukru. Doświadczenie prowadzono w dwu etapach (dwu latach) w trzech gospodarstwach. Uzyskano lepsze właściwości technologiczne na obszarze o zmodyfikowanym nawożeniu (niższe dawki azotu, nawożenie mikroelementami, dobór dawek nawozów oparty na analizach gleby). Największy, istotny wpływ na badane parametry miały warunki meteorologiczne ale zarejestrowano także istotny wpływ odmiany i poziomu technologicznego uprawy buraków.
The aim of the study was to determine the effect of slaughter age of broiler chickens on macromineral levels of breast and leg muscles and their association with meat quality. Used were fast-growing Hybro chickens kept on litter and fed the uniform diet. Ten chickens weighing 2 kg each were selected for slaughter at 35, 38 and 42 day of life. Breast and leg muscles were evaluated for pH,colour (CIELAB), water-holding capacity, drip loss, cooking loss, shear force, as well as for Na,Ca, K, P and Mg content. The birds’ age had an effect on the Na and K content of breast muscles and on the K, P and Mg content of leg muscles. No significant differences were found in most physicochemical characteristics of breast meat except pH which was the lowest in the oldest birds and cooking loss which was the highest in the youngest birds. No relationship between the level of individual minerals and meat quality traits was identified in breast muscles. In leg muscles Mg level correlated positively with pH15min and drip loss, P level with pH15min, and potassium level with waterholding capacity. Breast muscles turned out to be a richer source of K, Mg and P and leg muscles contained more Na.
The ethanol-influenced changes in proteins and some mineral compounds of milk were examined. Despite apparent phasing (induction and post-induction phases), the ethanol coagulation of milk was found to be a continuous process, lasting until 75% of proteins was coagulated and about 20% of proteins was changed into proteozo-peptone and non-protein nitrogen. It was shown that as2-casein and ß-lactoglobulin were more resistant to alcohol than heating. The solubility of mineral compounds of milk was found to decrease upon the alcohol addition and the Ca/P weight ratio was indicative of variability in the form of salts being precipitated.
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