排序方式： 共有6条查询结果，搜索用时 15 毫秒
1
1.
Adane Tilahun Getachew Susan Lvstad Holdt Anne Strunge Meyer Charlotte Jacobsen 《Marine drugs》2022,20(4)
This study was aimed at investigating the effect of low polarity water (LPW) on the extraction of bioactive compounds from Fucus vesiculosus and to examine the influence of temperature on the extraction yield, total phenolic content, crude alginate, fucoidan content, and antioxidant activity. The extractions were performed at the temperature range of 120–200 °C with 10 °C increments, and the extraction yield increased linearly with the increasing extraction temperature, with the highest yields at 170–200 °C and with the maximum extraction yield (25.99 ± 2.22%) at 190 °C. The total phenolic content also increased with increasing temperature. The extracts showed a high antioxidant activity, measured with DPPH (2,2-Diphenyl-1-picrylhydrazyl) radicals scavenging and metal-chelating activities of 0.14 mg/mL and 1.39 mg/mL, respectively. The highest yield of alginate and crude fucoidan were found at 140 °C and 160 °C, respectively. The alginate and crude fucoidan contents of the extract were 2.13% and 22.3%, respectively. This study showed that the extraction of bioactive compounds from seaweed could be selectively maximized by controlling the polarity of an environmentally friendly solvent. 相似文献
2.
Mekonen Desalegn Abebe Abraham Adane Oselebe Happiness Afiukwa Celestine Ilesanmi Oluyinka Abebe Tiegist Dejene 《Genetic Resources and Crop Evolution》2022,69(3):1247-1260
Genetic Resources and Crop Evolution - Grass pea (Lathyrus sativus L.) is a legume crop known to be an excellent source of protein, tolerant to drought, waterlogging, and salinity. The crop is used... 相似文献
3.
From 2009/2010 to 2010/2011, flight patterns and spatial distribution of pea aphids were studied in northwestern Ethiopia. Yellow traps were used and legume fields sampled. Trap catches varied between years (lower in 2009/2010 than in 2010/2011), locations and months in the growing season. At Woreta, peaks were observed in January (20–70 per trap) and at Wondata in October and November (60–80 per trap). Also, pea aphid numbers were more on fallow land than on other land-use systems (a maximum of 41,000 in December 2010/2011 and 25,000 in January 2009/2010 per 100 plants). Taylor's power law coefficients, i.e., b values, were significantly greater than 1 on grass peas planted after fallow; the corresponding r2 values ranged between 0.87 and 0.94. Coefficients were inconsistent on grass peas planted after teff and undersown in maize. The optimum sample size n (number of yellow traps) required in relation to the mean densities of the pea aphid was more or less the same for the three levels of accuracy (D = 0.2, 0.3 and 0.5). At D = 0.5, numerical sample size curves showed 10 traps as mean number of aphids per trap approached 4 or 5, which is practical and affordable. Some additional work at more locations may be required to validate these sampling plans before wider use. 相似文献
4.
5.
6.
The study was conducted at Zengena forest, a fragmented remnant montane forest in northwestern Ethiopia, which surrounds Lake Zengena. The purpose was to assess the species composition, diversity and the regeneration status of woody plants. A total of 27 plots of 20 m × 20 m were sampled along the line transects laid down the altitudinal gradient from the edge of the forest encompassing the lake to the edge of the lake in eight aspects. In each plot, woody species were counted and the diameter at breast height and the height of trees and shrubs were measured. A total of 50 woody species belonging to 31 families were found, of which 17(34%) were trees, 7(14%) trees or shrubs, 23(46%) shrubs and 3(6%) lianas. The overall Shannon-Wiener diversity and evenness indices of woody species were 2.74 and 0.7, respectively. Clausena anisata had the highest relative density(23.5%), Rapanea rhododendroides the highest relative frequency(6.5%) and Prunus africana the highest relative dominance(45%) and importance value index(IVI, 51.6). The total basal area and density of woody plants were 22.3 m2?ha-1 and 2,202 individuals?ha-1, respectively. The population structure showed variations among woody plants and revealed varied regeneration patterns of different species. The importance value index and population structure revealed that some species are threatened and need prioritization for conservation measures. The results suggest that remnant forest patches in the highlands of northern Ethiopia host several woody plant species that are almost disappearing in other areas due to deforestation. 相似文献
1