为进一步提升法夫酵母虾青素产量和虾青素占类胡萝卜素比例,考察了大宗碳源及其组合对法夫酵母细胞生长和虾青素生产的影响,并在70 L发酵罐上进行配比确定,在10 m 3发酵罐上进行中试放大。结果表明:有利于细胞增殖的碳源为糖蜜、葡萄糖...为进一步提升法夫酵母虾青素产量和虾青素占类胡萝卜素比例,考察了大宗碳源及其组合对法夫酵母细胞生长和虾青素生产的影响,并在70 L发酵罐上进行配比确定,在10 m 3发酵罐上进行中试放大。结果表明:有利于细胞增殖的碳源为糖蜜、葡萄糖、麦芽糊精和麦芽糖浆,有利于类胡萝卜素合成的为麦芽糊精、麦芽糖浆、淀粉水解液和蔗糖,有利于虾青素合成的为麦芽糊精、淀粉水解液和麦芽糖浆;不同碳源组合中,糖蜜或葡萄糖与麦芽糊精组合时虾青素产量最高,分别达到(58.7±1.2)、(55.1±0.8)μg/mL;在70 L发酵罐中,葡萄糖和麦芽糊精质量比为1∶1时较佳,虾青素产量和干菌体虾青素含量分别为(341.0±7.2)μg/mL和4.08 mg/g(细胞干重);在10 m 3发酵罐中进行工艺放大,虾青素产量和虾青素占类胡萝卜素比例分别为(360.3±0.8)μg/mL和42.2%,干菌体虾青素含量为3.88 mg/(g细胞干重),稍低于小试。该研究确定了法夫酵母虾青素生产的碳源种类和混合补加比例,为虾青素商业化生产提供了重要参考。展开更多
Several representative studies on China＇s carbon emission scenarios in 2050 are compared in scenario settings, methodologies, macro parameters, energy consumption and structure, carbon emissions, and carbon emission ...Several representative studies on China＇s carbon emission scenarios in 2050 are compared in scenario settings, methodologies, macro parameters, energy consumption and structure, carbon emissions, and carbon emission intensity. Under the baseline scenario of the present policy framework, the future energy structure will be optimized and carbon emission intensity will decrease continually. China＇s carbon emissions up to 2050 show a significant increase reaching between 11.9 Gt and 16.2 Gt CO2 in 2050. By strengthening a low carbon policy, the optimization of energy structure and the decline in carbon emission intensity will become more obvious within the comparative scenarios, which show a significant decrease in carbon emission until 2050 reaching only between 4.3 Gt and 9.5 Gt CO2 bv then.展开更多
This article explores, through a case study, measures of energy efficiency in data processing centers. An analysis of this case demonstrates how the design criteria could improve the rate of consumption in IT centers,...This article explores, through a case study, measures of energy efficiency in data processing centers. An analysis of this case demonstrates how the design criteria could improve the rate of consumption in IT centers, which is currently the second most contaminating industry on the planet, and is the responsible for 2% of CO2 emissions, surpassed only by the aeronautical industry. The present and future situation of IT center energy consumption and associated environmental effects is analyzed, and also looks at how state-of-the-art technology, correctly implemented, could ensure significant rationalization of data processing center energy consumption. The article will examine optimization techniques, specific problems and case studies.展开更多
文摘为进一步提升法夫酵母虾青素产量和虾青素占类胡萝卜素比例,考察了大宗碳源及其组合对法夫酵母细胞生长和虾青素生产的影响,并在70 L发酵罐上进行配比确定,在10 m 3发酵罐上进行中试放大。结果表明:有利于细胞增殖的碳源为糖蜜、葡萄糖、麦芽糊精和麦芽糖浆,有利于类胡萝卜素合成的为麦芽糊精、麦芽糖浆、淀粉水解液和蔗糖,有利于虾青素合成的为麦芽糊精、淀粉水解液和麦芽糖浆;不同碳源组合中,糖蜜或葡萄糖与麦芽糊精组合时虾青素产量最高,分别达到(58.7±1.2)、(55.1±0.8)μg/mL;在70 L发酵罐中,葡萄糖和麦芽糊精质量比为1∶1时较佳,虾青素产量和干菌体虾青素含量分别为(341.0±7.2)μg/mL和4.08 mg/g(细胞干重);在10 m 3发酵罐中进行工艺放大,虾青素产量和虾青素占类胡萝卜素比例分别为(360.3±0.8)μg/mL和42.2%,干菌体虾青素含量为3.88 mg/(g细胞干重),稍低于小试。该研究确定了法夫酵母虾青素生产的碳源种类和混合补加比例,为虾青素商业化生产提供了重要参考。
基金supported by the "Low Carbon Economy Academy Special Programs,Tsinghua University Independent Research Plan"
文摘Several representative studies on China＇s carbon emission scenarios in 2050 are compared in scenario settings, methodologies, macro parameters, energy consumption and structure, carbon emissions, and carbon emission intensity. Under the baseline scenario of the present policy framework, the future energy structure will be optimized and carbon emission intensity will decrease continually. China＇s carbon emissions up to 2050 show a significant increase reaching between 11.9 Gt and 16.2 Gt CO2 in 2050. By strengthening a low carbon policy, the optimization of energy structure and the decline in carbon emission intensity will become more obvious within the comparative scenarios, which show a significant decrease in carbon emission until 2050 reaching only between 4.3 Gt and 9.5 Gt CO2 bv then.
文摘This article explores, through a case study, measures of energy efficiency in data processing centers. An analysis of this case demonstrates how the design criteria could improve the rate of consumption in IT centers, which is currently the second most contaminating industry on the planet, and is the responsible for 2% of CO2 emissions, surpassed only by the aeronautical industry. The present and future situation of IT center energy consumption and associated environmental effects is analyzed, and also looks at how state-of-the-art technology, correctly implemented, could ensure significant rationalization of data processing center energy consumption. The article will examine optimization techniques, specific problems and case studies.
