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Ivana Sedej Anamarija Mandi&#x; Marijana Saka
Aleksandra Mi&#x;an Vesna Tumbas 《Cereal Chemistry》2010,87(5):387-392
Plant phenolics and tocopherols content were determined in light and wholegrain buckwheat and wheat flour. Antioxidant activity of flours were comparatively assessed by scavenging activity on 1,1‐diphenyl‐2‐picrylhydrazyl (DPPH•), hydroxyl (•OH), and superoxide anion (O2•–) radicals, reducing activity, and chelating activity on Fe2+. Rutin, quercetin, and ferulic acid were quantified in both buckwheat flours, while ferulic acid was quantified in wholegrain wheat flour. Significantly higher content of phenolics and tocopherols was found in buckwheat than in wheat flours. Tocopherols in buckwheat flours were present in the order: γ‐ > α‐>> δ‐tocopherol, and in wheat flours: α‐ > γ‐ >> δ‐tocopherol. Buckwheat flours possessed better scavenging abilities on DPPH•, •OH and O2•– radicals, as well as better reducing activity, while wheat flours showed better chelating activity on Fe2+, according to IC50 values. Results suggest the possibility of improving the antioxidant properties of wheat‐based food products through addition of buckwheat flour. 相似文献
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Strawberries (Fragaria × ananassa Duch. cv. Nyoho) grown in peat-based substrate often suffer interveinal chlorosis in their immature leaves 10–20 d after planting. Based on our previous results and observations from growing practice, we hypothesized that the cause of this phenomenon could be due to drastic changes in plant nitrogen (N) nutrition in strawberries just after planting into peat bags. To determine optimal sampling time, diurnal variations in foliar ammonium (NH4)-N concentration were evaluated under greenhouse conditions. Results showed a broadly similar pattern of diurnal variation, with the rates increasing to a maximum at midday and decreasing steadily during the second-half of the light period. However, foliar NH4-N concentration was higher under sunny than under cloudy or shaded light conditions. In the second part of this study, changes in foliar NH4-N and in nitrate (NO3)-N in petioles in relation to the occurrence of interveinal chlorosis were investigated. When the plants were supplied with 30 (control) or 50% ‘Ohtsuka A’ nutrient solution for two weeks after planting, foliar NH4-N concentrations increased earlier than petiole NO3-N concentrations, and reached their peak 8 and 10 days after planting in 50% (1.90 μmol g?1 FW) and 30% (1.78 μmol g?1 FW) treatment respectively. Interveinal chlorosis was observed in immature leaves in 50% treatment about 10 days after planting while there was no chlorotic symptom in control treatment. The absence of interveinal chlorosis in immature leaves in control plants, led to the conclusion that a high leaf NH4-N concentration and related accumulation of NH4-N play an important role in triggering interveinal chlorosis. 相似文献
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Sustainable aquaculture: developing the promise of aquaculture 总被引：3，自引：0，他引：3
As experience with aquaculture grows worldwide, the concept of sustainable aquaculture is increasingly recognized to incorporate
both spatial and temporal dimensions of environmental, economic, and social parameters. Practitioners have discovered that
sustainable aquaculture must not only maximize benefits, but also minimize accumulation of detriments, as well as other types
of negative impacts on natural and social environment. Therefore, sustainable aquaculture development must be advanced in
a manner that is environmentally sustainable and that protects the quality of the environment for other users, while it is
equally important for society to protect the quality of the environment for aquaculture. This paper provides a brief review
of the worldwide aquaculture development in the last decade, and gives a few examples of sustainable aquaculture activities
in the coastal areas that are using natural coastal habitats and ecosystems. Based on already existing national and international
efforts to promote sustainable aquaculture, key recommendations are provided, including what should be the next proactive
steps.
This revised version was published online in August 2006 with corrections to the Cover Date. 相似文献
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Melita Peharda Ivan &#;upan Lav Bav&#;evi&#; Anamarija Franki&#; & Tin Klanj&#;&#;ek 《Aquaculture Research》2007,38(16):1714-1720
Integrating mussel and finfish aquaculture has been recognized as a way to increase profits and decrease environmental impacts of finfish aquaculture, but not enough is known about the effects of finfish aquaculture on mussel growth. Here we present a pilot study aimed at determining how distance from finfish aquaculture affects mussel growth. To this end, we measured growth and condition index of mussel (Mytilus galloprovincialis) at three different distances (0, 60 and 700 m) from finfish aquaculture in the eastern Adriatic Sea. There was a statistically significant difference in growth of tagged mussels with respect to site. Average measured lengths of mussels at sites 1, 2 and 3 after the 10 months of the experiment were 57.60, 62.73 and 58.66 mm. Mussels grew fastest from March to May, and slowest from July to September, regardless of their position. Condition index showed spatial and temporal variations with higher values during fall and winter (∼23), and lower values during spring and summer (∼20). Our results show that production cycle in areas traditionally considered suboptimal for aquaculture can be equivalent to the cycle in areas traditionally considered optimal for mussel aquaculture if mussel aquaculture is integrated with finfish aquaculture. 相似文献
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Ivana SedejMarijana Saka? Anamarija Mandi?Aleksandra Mišan Vesna TumbasMiroslav Hadna?ev 《Journal of Cereal Science》2011,54(3):347-353
This study examined the antioxidant properties of the ethanolic extracts of wheat milling fractions (wheat flour type 500 and type 850, and bran) and their polyphenol and tocopherol content, and rheological characteristics of wheat dough supplemented with buckwheat flours (light and wholegrain). The results obtained in this study were correlated with our previously published data on wheat flour type 400, wholegrain wheat flour and buckwheat flours.Buckwheat flours exhibited significantly higher (P < 0.05) antiradical activity on hydroxyl (OH), superoxide anion (O2−) and (1,1-diphenyl-2-picrylhydrazyl) DPPH radicals, antioxidant activity and reducing power than all investigated wheat milling fractions when their corresponding IC50 values were compared.The rheological parameters of wheat dough supplemented with light and wholegrain buckwheat flour (0-50%) were obtained by using Mixolab. Results indicated changes in protein and starch properties of dough.The obtained results indicate the benefit of using buckwheat flours in wheat-based food products, i.e. their contribution in functional and tailor-made-food production. 相似文献
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