Search

Search Results

• Antioxidant activity and total flavonoid content of honeys

  25-28

  Nikolett Czipa

  Mária B. Varga

  Zoltán Győri

  Views:

  109

  The influence of honey on human health has been known since ancient times. Different components, like vitamins, amino-acids, enzymes, and the so called antioxidant activity of the honey play role in this effect, and also in the excellent quality. The aim of present study was to determine the total antioxidant activity and the flavonoid content of some honey samples. These two parameters are widely studied, and a lot of data can be used to compare and analyse. On the basis of them we can state that our results are quite similar than those we can find in literature. Characteristic feature of the examined honey samples is, that the antioxidant activity increased with the darkening of the colour. The lowest antioxidant activity and flavonoid content was produced by the acacia honeys with greenish shade of colour. The highest values was found in the very dark honeys (forest, sage, golden rod). The only exception was the coriander honey, where despite of its lighter colour, very high antioxidant activity was
  measured. 

• The effects of the nanoselenium supplementation to the production parameters and the selenium retention of the red drum (Sciaenops ocellatus)

  43-48

  Péter Juhász

  Milan Fehér

  Éva Csorvasi

  Péter Bársony

  Judit Remenyik

  Attila Sztrik

  József Prokisch

  László Stündl

  Views:

  196

  The selenium is an essential trace element with antioxidant effect, constituent of many enzymes, natural component of the body of the animals. The addition to the fish feed as micro element supplementation is generally accepted. Numerous animal experiments veryfied, that the antioxidant effect of the nanoselenium is higher than other selenium forms. But no much information is available of the usuage at fish.

  In the experiment were investigated the effects of the nanoselenium supplementation of a commercial fish feed were investigated to the production parameters and the body tissue composition. The correlation between the accumulated selenium content of the body and the treatment, and the feed conversation was also statistically analyzed beside the production parameters. Furthermore we were curious, if can be toxic the nanoselenium in higher doses.

  The experimental stock was placed into 12 plastic tanks (each 70 l water vol.) in a recirculation system for larval rearing. The salinity and the water temperature was constant during the 8 week long experiment. The feeding was ad libitum, 4 times a day. Beside the control five (1, 1.5, 2.5, 5.5, 10.5 mg Se kg^-1) duplicated treatment were set.

  According to the results, from the production parameters only at the value of FCR and the survival was found significant difference (p<0.05) between the groups. However strong correlation (r=0.752–0.780, p<0.01) was determined between the treatment and the accumulated selenium levels. To analyzed the free fatty acid contentof the fish, we realized, that the selenium uptake significanly enhanced this level at all treatments. The greatest change was found in case of the type n^-3 fatty acids.

  Established by the results, the higher intake than 0.5 mg Se kg^-1 was not changed significantly the production parameters, nevertheless to increase the selenium content of commercial feeds to 1.5 mg Se kg^-1 could be rewarding on the rearing of red drum.

• Exogenous salicylic acid treatments enhance tolerance to salinity of wheat (Triticum aestivum) plantlets

  34-38

  Cornelia Purcǎrea

  Dorina Cachită

  Adriana Petrus

  Liviu Pop

  Adriana Chis

  Views:

  118

  Salt stress, an abiotic stress, determines modifications of some biochemical indicators, like, antioxidant enzymes, proline (amino acid
  accumulate in higher plants under salinity stress) content, and some physiological processes including: plant growth and development. In
  this paper we studied the influence of exogenous treatment of wheat seeds, with 0.1 mM salicylic acid (SA) solution, in the plant response to
  salt stress. The treatment was applied by presoaking the seeds in the treatment solution for 12 hours before germination. The results showed
  that exogenous 0.1 mM SA solution, administrated to the wheat cariopses significantly ameliorated the negative effect of salt stress in first
  week of germination in laboratory conditions.