婴幼儿乳粉脂肪酸组成检测

将婴幼儿奶粉经盐酸水解后,利用乙醚-乙醇-石油醚(1∶1∶1,V/V)提取脂肪,然后经氢氧化钾-甲醇溶液甲基化反应后,用附带氢火焰检测器的气相色谱仪,按照程序升温测定出奶粉中脂肪酸组成.各项检测指标理想,该检测方法相对标准偏差(RSD)为0.91％～3.82％,回收率为86.4％～103.9％,灵敏度高,检测限为0.1mg/100g,与国家标准相比,样品处理方法简单快捷,易于操作,方法重现性良好.     

Relationship Between Anthocyanin Biosynthesis and Related Enzymes Activity in Pyrus pyrifolia Mantianhong and Its Bud Sports Aoguan

The aim of this article is to study the relationship between biosynthesis of anthocyanin and activities of phenylalanine ammonia lyase （PAL）, chalcone ismoerase （CHI） enzymes in Pyrus pyrifolia. Changes in the level of anthocyanin and the activities of enzymes of anthocyanin biosynthesis including PAL, CHI were studied in the pericarp of Pyrus pyrifolia Aoguan and Mantianhong during the period of pigment formation. Bagging treatment was also carried out to manipulate the synthesis of anthocyanin and the activities of related enzymes during the period of pigment formation. The results demonstrated that the level of anthocyanin of Aoguan was higher than that of Mantianhong. However, the content of anthocyanins has the similar changing trend in Aoguan and Mantianhong, highest anthocyanin concentrations of two varieties appeared in immature fruit and faded toward harvest. Meanwhile, similar changing trends of activities of PAL and CHI were also observed in both varieties. Aoguan has a lower activity of PAL than Mantianhong, whereas activity of CHI in Aoguan was higher than that in Mantianhong. Activity of PAL decreased during the period of pigment formation and was apparently not limiting to color development, whereas CHI activity increased at the same period and was closely related to the synthesis of anthocyanin. The results of bagging treatment showed that bagging treatment inhibited the activity of CHI, as well as the synthesis of anthocyanin, whereas debagging enhanced both the activity of CHI and synthesis of anthocyanin. The activity of CHI in debagging Aoguan pericarp was higher than the untreated Aoguan. However, effect of bagging treatment toward PAL activity was not obvious. Anthocyanin of bagging treated Aoguan decreased toward harvest. The content of anthocyanin of Pyruspyrifolia increased at the beginning of fruit coloration period and decreased toward fruit harvest. Activity of PAL was apparently not limiting to color development, whereas CHI activity was closely related to the synthesis of ant     

5个番石榴品种在南宁地区的引种试种初报

为给南宁地区引进番石榴优良品种并进行规模化推广栽培提供理论依据和技术支撑,对珍珠番石榴、西瓜番石榴、红宝石番石榴等5个番石榴品种的植株生长表现与植物学特征、农艺性状、果实品质性状进行了对比研究。结果表明,珍珠番石榴、红宝石番石榴、西瓜番石榴丰产稳产,口感酥脆、甜酸适宜,品质优,适合在南宁地区推广栽培;西瓜2号番石榴产量高,果肉嫩滑,口感好,但不耐储运;水晶无籽番石榴果肉酥脆,甜度适中,但产量低;因此,西瓜2号番石榴和水晶无籽番石榴不建议在南宁地区推广规模化栽培。     

Quality Supervision of Glass Curtain Wall Projeet

This thesis expounds the main content and the attentive problems of the supervision of glass curtiain wall during preparing stage of construction.construction stage and completion and acceptance stage,and puts forward some advices to ensure the work quality.Key Words glass curtain wall; project quality; supervision