1,720,969 research outputs found
Protection of Monumental Trees as a Cultural and Environmental Heritage
No full textSince long time, ancient and special individual trees have been recognized by humans as part of their history as well as natural monument to be respected and preserved, nevertheless the development of intensive agriculture and urbanization caused the lost of large part of this heritage. The value of the “monumental”, “ancient” or “veteran tree” is now commonly accepted everywhere, and systematic recognitions and recording, studies and protection initiatives are increasing more and more everywhere. This paper gives an overview about the current approaches for the preservation of monumental trees, referring to the main implemented programs & projects, organizations or governmental bodies, selection criteria, recording systems, data base and national laws promulgated to protect the ancient tree. Monumental trees as a card of the landscape-cultural mosaic is discussed
Time course of diamine oxidase and peroxidase activities and polyamine changes after mechanical injury of chickpea seedlings
No full textUltrasound-assisted extraction of proanthocyanidins from vine-shoots of Vitis vinifera.
No full textProanthocyanidins are high added value polyphenols which have received considerable attention for their health-protective activities. An alternative vine-shoots exploitation as a cheap source of proanthocyanidins obtained by ultrasound-assisted extraction was studied. Amplitude (50–100%), liquid-to-solid ratio (L/S) (50–100 mL/ g) and extraction time (10–30 min) were the variables studied by Box–Behnken design to maximize extraction of oligomeric proanthocyanidins (OPCs) and polymeric proanthocyanidins (PPCs) extracted from vine shoots at 80°C. Under the optimal conditions found and validated the OPCs resulted 89.18 ± 0.08 mg catechin/100 g DM and the PPCs 95.46 ± 0.65 mg catechin /100 g DM. The total proanthocyanidins content found in vine shoots was 1.82 mg/g DM and resulted higher than those reported for barley, whole grain rice and stored vine shoots
Broken and Intact Cell Model for supercritical carbon dioxide extraction of tea Camellia sinensis (L) seed oil
No full textThe model of broken and intact cells was used to fit the experimental data, and it was proved to be able to describe the extraction process of tea seed oil. The extraction rate, observed through the overall extraction curves (OEC), resulted in being faster the higher the pressure whereas the temperature had less influence on the extraction kinetics. The volume mass transfer coefficients in the fluid phase (kfa0) and solid phase (ksas) were used as fitting parameters. The maximum average deviation between measured and calculated oil yield was 4.1%. Mass transfer coefficients in the fluid phase and solid phase varied between 2.40·10−2–2.75·10−2 s−1 and 4.32·10−5–6.90·10−5 s−1, respectively. The outcomes of work showed the highest extraction yield (50.03 ± 0.68% w/w) obtained at 300 bar and 40 °C. Tea seed oil extracted using SC-CO2 presented higher antioxidant capacity and lower UV indices than oil extracted with n-hexane
Grain Beta-glucans deposition as affected by nitrogen fertilization in winter barley. Could a source-sink imbalance be a response trigger?
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Efficiency normal and loaded parthenolide on nano-meso particles as antiproliferative agent against breast cancer cell line in vitro
No full textParthenolide is major sesquiterpene lactones present in Tanacetum parthenium (L.) Sch.Bip. (feverfew). This compound is known as herbal active principals with potential use in pharmaceutical and medicine. In order to solubility improving, analogue of Parthenolide, aminopropyl theoxy silane -mesoporous silica of Parthenolide, was synthesized as well. In this study, it was extracted from fresh flowers of feverfew and was purified and identified by chromatography methods Cell death of breast cancer cell line MDA-MB-231 was assayed 24 hour after administration of normal and nanoparticle Parthenolide by Methylthiazol Tetrazolium test and Annexin-VFlous kit and scanning electron microscopy. The results revealed that anti-growth effect of Parthenolide is independent of exposure time and induced apoptosis in cancer cells yet this effect on fibroblast cells as normal ones did not recognized which guarantees the use of this medicinal herb to treat cancers without promotion of other not interested side effect
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