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排序方式: 共有135条查询结果,搜索用时 15 毫秒
71.
Korekar G Stobdan T Arora R Yadav A Singh SB 《Plant foods for human nutrition (Dordrecht, Netherlands)》2011,66(4):376-383
Fourteen apricot genotypes grown under similar cultural practices in Trans-Himalayan Ladakh region were studied to find out
the influence of genotype on antioxidant capacity and total phenolic content (TPC) of apricot kernel. The kernels were found
to be rich in TPC ranging from 92.2 to 162.1 mg gallic acid equivalent/100 g. The free radical-scavenging activity in terms
of inhibitory concentration (IC50) ranged from 43.8 to 123.4 mg/ml and ferric reducing antioxidant potential (FRAP) from 154.1 to 243.6 FeSO4.7H2O μg/ml. A variation of 1–1.7 fold in total phenolic content, 1–2.8 fold in IC50 by 2,2-diphenyl-1-picrylhydrazyl (DPPH) assay and 1–1.6 fold in ferric reducing antioxidant potential among the examined
kernels underlines the important role played by genetic background for determining the phenolic content and antioxidant potential
of apricot kernel. A positive significant correlation between TPC and FRAP (r = 0.671) was found. No significant correlation was found between TPC and IC50; FRAP and IC50; TPC and physical properties of kernel. Principal component analysis demonstrated that genotypic effect is more pronounced
towards TPC and total antioxidant capacity (TAC) content in apricot kernel while the contribution of seed and kernel physical
properties are not highly significant. 相似文献
72.
Krishnan Vijayaraghavan Desa Ahmad & Tariq Syahman Bin Fadzin 《Aquaculture Research》2008,39(5):449-456
This study presents an unconventional framework for treating shrimp aquaculture wastewater based on in situ hypochlorous acid (HOCl) oxidation. The in situ oxidation process makes use of the salinity present in aquaculture wastewater to generate HOCl. The undivided electrolytic cell consisted of two sets of graphite as the anode and stainless sheets as the cathode. The electrochemical oxidation of shrimp aquaculture wastewater was carried out for an influent COD concentration of 1730 mg L?1 at current densities of 37.2 and 74.5 mA cm?2. The results showed that in order to achieve a residual COD concentration of 50±5 mg L?1 at current densities of 37.2 and 74.5 mA cm?2, electrolysis periods of 60 and 30 min are required respectively. Hence, for the above‐mentioned current densities, the corresponding energy requirements were found to be 19.4 and 13.3 W h L?1. The cost incurred in treating 1 m3 of shrimp aquaculture wastewater was found to be RM 4 and 3 when the electrolytic reactor was operated at a current density of 37.2 and 74.5 mA cm?2 with a salinity of 23‰. The foregoing study highlights the potential of in situ HOCl oxidation in treating brackish shrimp aquaculture wastewater. 相似文献
73.
74.
Colloidal nanocrystal shape and size control: the case of cobalt 总被引:1,自引:0,他引:1
We show that a relatively simple approach for controlling the colloidal synthesis of anisotropic cadmium selenide semiconductor nanorods can be extended to the size-controlled preparation of magnetic cobalt nanorods as well as spherically shaped nanocrystals. This approach helps define a minimum feature set needed to separately control the sizes and shapes of nanocrystals. The resulting cobalt nanocrystals produce interesting two- and three-dimensional superstructures, including ribbons of nanorods. 相似文献
75.
Mackay ME Tuteja A Duxbury PM Hawker CJ Van Horn B Guan Z Chen G Krishnan RS 《Science (New York, N.Y.)》2006,311(5768):1740-1743
Traditionally the dispersion of particles in polymeric materials has proven difficult and frequently results in phase separation and agglomeration. We show that thermodynamically stable dispersion of nanoparticles into a polymeric liquid is enhanced for systems where the radius of gyration of the linear polymer is greater than the radius of the nanoparticle. Dispersed nanoparticles swell the linear polymer chains, resulting in a polymer radius of gyration that grows with the nanoparticle volume fraction. It is proposed that this entropically unfavorable process is offset by an enthalpy gain due to an increase in molecular contacts at dispersed nanoparticle surfaces as compared with the surfaces of phase-separated nanoparticles. Even when the dispersed state is thermodynamically stable, it may be inaccessible unless the correct processing strategy is adopted, which is particularly important for the case of fullerene dispersion into linear polymers. 相似文献
76.
Pagani M Huber M Liu Z Bohaty SM Henderiks J Sijp W Krishnan S DeConto RM 《Science (New York, N.Y.)》2011,334(6060):1261-1264
Earth's modern climate, characterized by polar ice sheets and large equator-to-pole temperature gradients, is rooted in environmental changes that promoted Antarctic glaciation ~33.7 million years ago. Onset of Antarctic glaciation reflects a critical tipping point for Earth's climate and provides a framework for investigating the role of atmospheric carbon dioxide (CO(2)) during major climatic change. Previously published records of alkenone-based CO(2) from high- and low-latitude ocean localities suggested that CO(2) increased during glaciation, in contradiction to theory. Here, we further investigate alkenone records and demonstrate that Antarctic and subantarctic data overestimate atmospheric CO(2) levels, biasing long-term trends. Our results show that CO(2) declined before and during Antarctic glaciation and support a substantial CO(2) decrease as the primary agent forcing Antarctic glaciation, consistent with model-derived CO(2) thresholds. 相似文献
77.
78.
Eugene Marshack K. S. Krishnan Teruzo Asahara Eduardo Vioque Reinhard Marcuse 《Potato Research》1988,31(4):579-579
News
African Potato Association 相似文献79.
S. Prathibha Bala Nambisan S. Leelamma 《Plant foods for human nutrition (Dordrecht, Netherlands)》1995,48(3):247-257
Tubers of Cassava (Manihot esculenta), yams (Dioscorea esculenta),aroids (Amorphophallus campanulatus, Colocasia esculenta, Xanthosoma sagittifolium) and Coleus (Solenostemon rotundifolius) were screened for inhibitory activities against amylase, trypsin and chymotrypsin. Coleus tuber possessed the highest anti-amylase activity, whereas Colocasia tuber was the most potent source of anti-tryptic and anti-chymotryptic activity. Xanthosoma tubers exhibited amylase inhibitory activity and Amorphophallus tubers antiprotease activity. Dioscorea esculenta had low levels of amylase and chymotrypsin inhibitors, while Cassava tubers were totally free of inhibitors. When tubers were processed by pressure cooking, there was significant reduction/complete elimination in inhibitory activity. Partial retention of inhibition was observed in the case of amylase inhibitor in Dioscorea, chymotrypsin inhibitor in Colocasia and trypsin inhibitor in Colocasia, Coleus and Amorphophallus. In vitro experiments on heat stability of the different inhibitors revealed almost similar pattern of inactivation. 相似文献
80.
Barnett TP Pierce DW Hidalgo HG Bonfils C Santer BD Das T Bala G Wood AW Nozawa T Mirin AA Cayan DR Dettinger MD 《Science (New York, N.Y.)》2008,319(5866):1080-1083
Observations have shown that the hydrological cycle of the western United States changed significantly over the last half of the 20th century. We present a regional, multivariable climate change detection and attribution study, using a high-resolution hydrologic model forced by global climate models, focusing on the changes that have already affected this primarily arid region with a large and growing population. The results show that up to 60% of the climate-related trends of river flow, winter air temperature, and snow pack between 1950 and 1999 are human-induced. These results are robust to perturbation of study variates and methods. They portend, in conjunction with previous work, a coming crisis in water supply for the western United States. 相似文献