Silica sols, a process for the production of silica sols and use of the
sols
    1.
    发明授权
    Silica sols, a process for the production of silica sols and use of the sols 失效
    二氧化硅溶胶,二氧化硅溶胶的生产工艺和溶胶的使用

    公开(公告)号:US5447604A

    公开(公告)日:1995-09-05

    申请号:US855649

    申请日:1992-05-08

    CPC分类号: D21H17/68 C01B33/1485

    摘要: Silica sols which have a large alkali excess, i.e. a low molar ratio SiO.sub.2 to M.sub.2 O, and which contain silica particles with a high specific surface area. The silica sols can be prepared through acidification of a water glass solution and subsequent alkalization of the acid sol to the molar ratio in question. The sols are particularly suitable for use as additives, in combination with cationic polymers, in papermaking.

    摘要翻译: PCT No.PCT / SE90 / 00690 Sec。 371日期:1992年5月8日 102(e)日期1992年5月8日PCT提交1990年10月24日PCT公布。 公开号WO91 / 07351 日期1991年5月30日。具有大量碱过量的硅溶胶,即SiO 2与M 2 O的摩尔比低,并且含有具有高比表面积的二氧化硅颗粒。 二氧化硅溶胶可以通过水玻璃溶液的酸化和酸溶胶的碱化至所讨论的摩尔比来制备。 该溶胶特别适用于在造纸中作为添加剂与阳离子聚合物的组合使用。

    Inducible fluorescence assay
    4.
    发明授权
    Inducible fluorescence assay 有权
    诱导荧光测定

    公开(公告)号:US07635598B2

    公开(公告)日:2009-12-22

    申请号:US11177998

    申请日:2005-07-08

    摘要: In one aspect, the invention provides fluorescent probes and assays. The probes include a fluorophore-quencher pair that undergoes a switch from dark to fluorescent in response to a reaction of the quencher. The switch of the probe from dark to fluorescent is typically mediated by an enzyme that acts directly or indirectly on the quencher, interfering with its ability to quench fluorescence emission from the fluorophore.In another aspect, the invention provides a reporter gene assay system and methods of using this system. The assay system includes a fluorophore-quencher probe and an enzyme that acts directly or indirectly on the quencher, increasing the fluorescent emission of the fluorophore. In still other aspects, the invention provides nucleic acid constructs and cells expressing the peptide products of these constructs.In assays of the invention, the presence of a target substance is detected by the switching of fluorescence mediated by the change in oxidation state of the quencher. The assay systems are of use in numerous assay formats, e.g., confirming the expression of the enzyme that acts on the quencher, and/or detecting a species conjugated to the enzyme.

    摘要翻译: 一方面,本发明提供了荧光探针和测定法。 探针包括响应于猝灭剂的反应经历从暗变为荧光的荧光团 - 猝灭剂对。 探针从黑暗到荧光的切换通常由直接或间接作用于猝灭剂的酶介导,干扰其从荧光团中淬灭荧光发射的能力。 另一方面,本发明提供报道基因测定系统和使用该系统的方法。 测定系统包括荧光团猝灭剂探针和直接或间接作用于猝灭剂的酶,增加荧光团的荧光发射。 在其它方面,本发明提供了表达这些构建体的肽产物的核酸构建体和细胞。 在本发明的测定中,通过由猝灭剂的氧化态的变化介导的荧光的转换来检测目标物质的存在。 测定系统可用于许多测定形式,例如确认作用于猝灭剂的酶的表达和/或检测与酶缀合的物质。

    Papermaking
    5.
    发明授权
    Papermaking 失效
    造纸

    公开(公告)号:US4385961A

    公开(公告)日:1983-05-31

    申请号:US238645

    申请日:1981-02-26

    摘要: A papermaking process in which an aqueous papermaking stock containing a cellulosic pulp is formed and dried. The stock includes a binder comprising colloidal silicic acid, and cationic starch which is added to the stock before the sheet is formed. The manner of addition involves first adding and intermixing in the stock a portion of the colloidal silicic acid and then the cationic starch and, after an agglomerate has formed, adding and intermixing the remainder of the colloidal silicic acid prior to the formation of the sheet. The method results in improved sheet properties and improved retention of filler and fines on the wire.

    摘要翻译: 其中形成含有纤维素纸浆的水性造纸原料并干燥的造纸方法。 原料包括粘合剂,其包含胶体硅酸和阳离子淀粉,其在片形成之前添加到原料中。 添加的方式包括首先在原料中加入和混合一部分胶体硅酸,然后加入阳离子淀粉,并且在形成附聚物之后,在形成片材之前加入和混合剩余的胶态硅酸。 该方法导致改善的片材性能和改善填料和细粒在线材上的保留性。