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Institute of Biology
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Department of Chemistry
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  • [Show abstract] [Hide abstract]
    ABSTRACT: The aim of the research was to determine the composition of organic acids in fruit of different cultivars of three pumpkin species. The amount of acids immediately after fruit harvest and after 3months of storage was compared. The content of organic acids in the examined pumpkin cultivars was assayed using the method of high performance liquid chromatography (HPLC). Three organic acids (citric acid, malic acid, and fumaric acid) were identified in the cultivars, whose content considerably varied depending on a cultivar. Three-month storage resulted in decreased content of the acids in the case of cultivars belonging to Cucurbita maxima and Cucurbita pepo species, while a slight increase was recorded for Cucurbita moschata species.
    Food Chemistry 04/2014; 148C:415-419.
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    ABSTRACT: The objective of the present research was to eliminate seasonal fluctuations in year-round reproductive performance of sows and to improve litter parameters by administration of oxytocin into liquid semen insemination doses. A 2-year experiment was performed on crossbreed sows, Polish Large White × Polish Landrace, which were partitioned into two groups: control, insemination without any modification with 100 mL semen doses and oxytocin, insemination with 100 mL semen doses to which 5 IU of oxytocin was added just before insemination. A total of 10,486 inseminations were made. The farrowing rate and obtained litter parameters, including the effect of season, were analyzed. For each litter, the following factors were defined: average litter size, percentage of fetal death and mummified piglets, average piglet birth weight, percentage of piglet mortality, fecundity index, average number of piglets weaned, weaned piglet weight, and daily gain. Sows presented a positive reaction to the experimental factor. A statistically higher farrowing rate for oxytocin group in summer and autumn seasons was confirmed (P ≤ 0.01). Regardless of the season, a higher average litter size was observed in the oxytocin group with the most evident differences for winter, spring (P ≤ 0.01), and summer (P ≤ 0.05). The effect of oxytocin on the percentage of fetal death and mummified piglets born was not confirmed statistically except for winter. Analyzing the fecundity index, higher values were obtained for the oxytocin group in all seasons (P ≤ 0.01), including the lowest difference between groups for winter (51.43) and the highest for summer (100.61). A higher average birth piglet weight and weaned piglet weight were recorded for the oxytocin group in all seasons. The highest differences in birth piglet weight between groups were noted for spring (0.22 kg; P ≤ 0.01) and winter (0.17 kg; P ≤ 0.05) and in weaned piglet weight for winter and spring (0.58 kg and 0.52 kg; for both, P ≤ 0.01). The greatest daily gains were observed in the winter season (P ≤ 0.05) in favor of oxytocin. On the basis of the presented results, it should be noted that the use of oxytocin into insemination doses improves the farrowing rate and other parameters of the reproductive performance of sows. In the absence of negative effects, year-round insemination with oxytocin addition into seminal doses is recommended, which effectively improves the production performance and reduces the problem of seasonality in reproduction.
    Theriogenology 01/2014;
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    ABSTRACT: Cherry leaf spot, caused by the fungus Blumeriella jaapi (Rehm) var. Arx. (syn. Coccomyces hiemalis Higgins), is one of the most serious fungal diseases of sour cherries. Therefore the aim of this study was to identify and quantify polyphenolic compounds found in cherry leaf extracts were identified and presented: fourteen hydroxycinnamates, fifteen flavonols, five flavan-3-ols and one flavon derivative. The total of phenolics in green leaf extract was 8737.13 mg but in yellow leaves was 10,058.00 mg/100 g dry matter (dm). The yellow leaves of spotted sour cherry was characterized by the largest content of flavonol and hydroxycinnamate compounds than green leaves.
    Physiological and Molecular Plant Pathology 01/2014;


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    Wrocław, Poland
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Theriogenology 01/2012; 77(8):1497-504.
Przemysl Chemiczny 07/2013; 92(7):1364-1366.

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