Much of rural North America, up until that time, had been relegated to farming, ranching and other resource extraction activities.
直到当时，北美乡下的许多地方已经开展了农业，畜牧和摄取其他资源的相关活动。
Fucoidan is a sulfated polysaccharide from brown seaweed, which has a variety of biological activities. the studies on the extraction, purification and fraction of fucoidan are summarized.
褐藻糖胶是存在于褐藻中的硫酸酯多糖，具有多种生物活性。本文综述了褐藻糖胶的提取、纯化和分级等方面的研究工作。
The extraction of acoustic characteristics of ocean sediment has great importance to civil and military activities.
海底沉积层声学特性提取在军事和民用上都具有重要意义。
The sources, structures, properties and physiological activities of chondroitin sulfate were briefly described. The methods of its extraction, purification and separation were reviewed.
介绍了硫酸软骨素的来源、结构、性质及其生理功能，对硫酸软骨素的提取、纯化及分离技术进行了综述。
In this review, the progress on extraction, isolation, structural elucidation and biological activities of oligosaccharides is reported.
本文综述寡糖的提取分离、结构分析和生物活性等相关研究新进展。
The ethanol extraction conditions of flavonoids from leaves of diospyros kaki and their antioxidant activities were studied simultaneously.
研究了用乙醇提取柿叶中黄酮类物质的工艺条件，并对其进行了抗氧化性能的初步探讨。
Modern extraction method is more efficient than the classical, the product is higher, and it will not affect the structure and activities.
现代提取方法较传统方法简便快捷，甘草多糖产量高，且不会影响多糖的结构和活性。
The chemical structures, spectral characters, methods of extraction and separation, toxicity and pharmacological activities of long-chain phenolic acids from exopleura of Ginkgo biloba were reviewed.
综述近年来有关银杏外种皮中已知的银杏酚酸类成分的化学结构、波谱性质、提取分离方法、毒性及药理作用等方面的研究概况。
The free radical scavenging activities of extracts of Aloe vera of leaf skin by supercritical CO2 extraction and solvent extraction were determined.
测定了芦荟皮的超临界CO_2提取物和溶剂提取物的自由基清除活性。
The results showed that the extraction technology was reasonable, the yield of total flavonoids was high, and extraction of Q. acutissima leaves had strong antioxidant activities in vitro.
试验结果表明提取工艺合理，黄酮提取率高，麻栎叶黄酮提取液具有很好的抗氧化活性。
The results showed that the extraction technology was reasonable, the yield of total flavonoids was high, and extraction of Q. acutissima leaves had strong antioxidant activities in vitro.
试验结果表明提取工艺合理，黄酮提取率高，麻栎叶黄酮提取液具有很好的抗氧化活性。
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