Biological material embedded in hydrogels, a process for the embedding
thereof, and its use as artificial seed
    15.
    发明授权
    Biological material embedded in hydrogels, a process for the embedding thereof, and its use as artificial seed 失效
    嵌入水凝胶中的生物材料,其嵌入方法及其作为人造种子的用途

    公开(公告)号:US6164012A

    公开(公告)日:2000-12-26

    申请号:US230379

    申请日:1999-04-27

    CPC分类号: C05G3/0047 A01H4/001 A01N3/00

    摘要: The invention relates to a completely biodegradable hydrogel comprising polyester polyurethane polyurea containing urea groups as well as polysaccharides and/or their derivatives, the hydrogel containing plant material capable of dividing. The invention also relates to a process for the embedding of the biological material and the fabrication and shaping of the hydrogels from aqueous solutions. The hydrogels according to the invention may be used as coating material for embedding biological material capable of dividing, especially plant material, preferably plant cells, protoplasts, plant tissues and plant organs, as well as zygotic or somatic plant embryos, under sterile conditions for the purpose of protecting the material during storage, transport and handling. The hydrogels according to the invention may also contain further additives, for example, plant protection agents or nutrients. The embedded biological plant material according to the invention may be used as artificial seed.

    摘要翻译: PCT No.PCT / EP97 / 03906 Sec。 一九九九年四月二十七日 102(e)1999年4月27日PCT 1997年7月21日PCT公布。 公开号WO98 / 05197 日期1998年2月12日本发明涉及包含含有尿素基团的聚酯聚氨酯聚脲以及多糖和/或其衍生物的完全可生物降解的水凝胶,所述水凝胶含有能够分裂的植物材料。 本发明还涉及用于从水溶液中包埋生物材料和水凝胶的制造和成型的方法。 根据本发明的水凝胶可以用作在无菌条件下包埋能够分裂的生物材料的涂层材料,特别是植物材料,优选植物细胞,原生质体,植物组织和植物器官以及合子或体细胞植物胚胎 在储存,运输和处理过程中保护材料的目的。 根据本发明的水凝胶还可以含有其它添加剂,例如植物保护剂或营养物质。 根据本发明的嵌入式生物植物材料可以用作人造种子。

    Cycloaliphatic thermoplastic polyurethane elastomers
    17.
    发明授权
    Cycloaliphatic thermoplastic polyurethane elastomers 失效
    环脂族热塑性聚氨酯弹性体

    公开(公告)号:US5942593A

    公开(公告)日:1999-08-24

    申请号:US805840

    申请日:1997-03-03

    摘要: A process for the preparation of a polyurethane-urea elastomer having a mole ratio of NCO groups to all active hydrogen atoms in the range of 0.9 to 1.2 is disclosed. The process comprise reacting (A), (B) and (C.2) for form an NCO-containing prepolymer and then reacting said prepolymer with (C.1) and (D). Accordingly (A) is 5-isocyanato-1-(isocyanatomethyl)-1,1,3-trimethylcyclohexane or bis-(4-isocyanatocyclohexyl)-methane,(B) is polytetrahydrofuran or hexanediol polycarbonate and (C.2) is a chain extender. (C.1) is 5-amino-3-amino-methyl-1,3,3-trimethylcyclohexane or bis-(4-aminocyclohexyl)-methane and (D) is a molecular weight regulator. The elastomer thus produced is particularly suitable for the preparation of moldings, films, flexible tubing (for medical purposes) and catheters.

    摘要翻译: 公开了一种制备具有NCO基摩尔数与所有活性氢原子在0.9至1.2范围内的聚氨酯 - 脲弹性体的方法。 该方法包括使(A),(B)和(C.2)反应形成含NCO的预聚物,然后使所述预聚物与(C.1)和(D)反应。 因此(A)是5-异氰酸基-1-(异氰酸根合甲基)-1,1,3-三甲基环己烷或双 - (4-异氰酸根合环己基) - 甲烷,(B)是聚四氢呋喃或己二醇聚碳酸酯,(C.2) 延长剂 (C.1)是5-氨基-3-氨基 - 甲基-1,3,3-三甲基环己烷或双 - (4-氨基环己基) - 甲烷,(D)是分子量调节剂。 如此制备的弹性体特别适用于制备模制品,薄膜,柔性管(用于医疗用途)和导管。