Objective:The paper is to study the remineralized effects on root caries of different kinds of fluoride toothpaste and fluoride-free toothpaste contained NaF concentration10, 20 and 40 mg/L. Methods:The tissue block of artificial body root was prepared from bovine incisor, "open window" and put them in 37℃demineralization solution for 96 hours to form artificial root caries. Six samples were randomly divided into each group. The demineralized samples were pH-cycled through for 8 days with 6 cycles per day. The samples were evaluated by using polarized light microscope(PLM). Results:Fluoride toothpaste group showed varying degrees of mineral deposition, and the deposition band width order was as follow: Darlie＞Cnice＞Colgate. The deposition band width order of fluoride-free toothpaste with NaF was as follow: 40 mg/L＞20 mg/L＞10 mg/L. Conclusion:The remineralization effect of Darlie in fluoride toothpaste was the best, and the remineralization of fluoride-free toothpaste with 40 mg/L NaF was the best.

Objective To explore the optimal storage method, antioxidant activities of fresh Cistanche deserticola fleshy stem were studied in response to the types of packaging and storage temperature during storage. Furthermore, this research will provide theoretical guides to preserve Cistanche deserticola fleshy stem. Methods The fresh fleshy stem of Cistanche deserticola was stored at 4 ℃ and 25 ℃using polyethylene( PE) film, vacuum packaging and vacuum packaging with nitrogen( N2) respectively, and the antioxidant enzyme activities were assayed regularly. Results The preservation temperature of Cistanche deserticola fleshy stem was better at 4 ℃ than that at25 ℃. Under 4 ℃ condition,vacuum packaging with N2 was conducive to maintaining antioxidant capacity. Conclusion The combination of vacuum packaging with N2 and lower temperature can keep better quality in fresh Cistanche deserticola fleshy stem during storage.

为研究氮磷钾配施对甘草(Gl ycyrrhiza uralensi)生长动态和产量的影响,对其进行“3414”氮磷钾配施试验.结果表明,氮、磷、钾配施对株高的促进效应主要表现在6月下旬之前的主茎快速生长期,对根干质量增加效应则主要表现在7-8月根粗和根长增加高峰期;中等水平氮(N2)、磷(P2)、钾(K2)对甘草生物量和产量促进效应最大;氮磷钾配施以N2P2K2时甘草产量最高,达6 500 kg·hm-2,较不施肥增产39.3％.推荐施氮量171kg· hm-2,施磷量292.5 kg·hm-2,施钾量49.5 kg·hm-2.

<正>葡萄是栽培历史悠久、经济价值很高的果树,在世界水果生产中,葡萄的栽培面积大,居第三位。葡萄适应性强,用途多,经济效益高,农业部已将甘肃省列为全国六大葡萄生产基地之一,武威市把葡萄产业作为农业结构调整的六大产业化基地建设之一。民勤地区地处腾格里沙漠的西南边缘,四季分明,年平均温度7.2℃~8℃,无霜期140天~160天。气候干旱少雨,光热资源丰富,病虫害少,特别是果实

通过在民勤县坝区石羊河林场宋和羊桥红枣示范基地几年的实践经验,初步形成推广砧木建园技术.利用酸枣、扁核酸根系发达、当年生长量大、抗逆性强的特点,先播种酸枣或定植扁核酸培育健壮砧木苗,然后嫁接优良品种,总结了一套适合民勤坝区红枣矮化密植快速建园技术,并针对民勤县坝区发展红枣产业提出了合理化建议,为当地红枣科学管理,实现早果丰产、早获效益提供了技术支持.