Boehringer Ingelheim(西德的Ingelheim Am Rhein)请求它的竞争对手—Behringwerke(西德的Marburg)在德国血栓溶解剂市场帮助销售血块溶解药—组织纤维蛋白原激活因子(TPA)。Boehringer具有Genentech公司(加利福尼亚州的南旧金山)研制的...Boehringer Ingelheim(西德的Ingelheim Am Rhein)请求它的竞争对手—Behringwerke(西德的Marburg)在德国血栓溶解剂市场帮助销售血块溶解药—组织纤维蛋白原激活因子(TPA)。Boehringer具有Genentech公司(加利福尼亚州的南旧金山)研制的TPA的独家许可权。而Behringwerke(Hoechst AG的一个分公司)则致力于销售链激酶。Boehringer对于销售链激酶无任何特权。终于他们做成了交易,Behringwerke将与Boehringer共同在西德销售TPA。展开更多
It has been shown that polarity of environment around Hoechst 33342 is almost unchanged while sorption of this fluorescent dye on a surface of the hairpin oligonucleotide HP1, t-RNA and DNA. At small concentrations, t...It has been shown that polarity of environment around Hoechst 33342 is almost unchanged while sorption of this fluorescent dye on a surface of the hairpin oligonucleotide HP1, t-RNA and DNA. At small concentrations, this dye, adsorbed on the surface of DNA, RNA or HP1, does not show any specificity to certain nucleotides. In the case of unwound sites of DNA or HP1, it can bind inside, but without the intercalation stacking with nucleotides. The energy transfer from nucleotide chromophores to Hoechst is absent due to their remoteness and also “bad” (non-stacking) orientation. The mutual fluorescence quenching of Hoechst by actinomycin D (AMD) and, vice versa, of 7-amino-actinomycin D (7AAMD) by Hoechst in DNA and HP1 is observed. It is due to dynamic deactivation and mutual replacing in binding sites.展开更多
文摘目的：利用Hoechst33342/PI双染法和原位末端标记法（TUNEL染色检测纳米二氧化硅（nm-SiO2）对神经细胞凋亡的影响，比较两种检测方法的优缺点。方法：以体外培养的人神经母细胞瘤SK-N-SH为研究对象，15和30 nm粒径的nm-SiO2（剂量为2.5、5、10μg/mL）分别处理细胞24 h，另设1-5 m SiO2组和溶剂对照组，采用Hoechst33342/PI双染法和TUNEL染色检测各处理组对SK-N-SH细胞凋亡的影响。结果：与对照组相比，两种检测方法分析均显示了nm-SiO2处理组SK-N-SH细胞凋亡率显著增加（P〈0.05），且具有尺寸、剂量依赖性，而微米级SiO2对凋亡的影响不显著（P〉0.05）。结论：nm-SiO2能诱导SK-N-SH细胞凋亡。Hoechst33342/PI双染法特异性高，简单易行；TUNEL法灵敏度高，能检测少量的细胞凋亡，但成本较高，两种方法可结合使用以便更加准确的检测神经细胞的凋亡。
文摘Boehringer Ingelheim(西德的Ingelheim Am Rhein)请求它的竞争对手—Behringwerke(西德的Marburg)在德国血栓溶解剂市场帮助销售血块溶解药—组织纤维蛋白原激活因子(TPA)。Boehringer具有Genentech公司(加利福尼亚州的南旧金山)研制的TPA的独家许可权。而Behringwerke(Hoechst AG的一个分公司)则致力于销售链激酶。Boehringer对于销售链激酶无任何特权。终于他们做成了交易,Behringwerke将与Boehringer共同在西德销售TPA。
文摘It has been shown that polarity of environment around Hoechst 33342 is almost unchanged while sorption of this fluorescent dye on a surface of the hairpin oligonucleotide HP1, t-RNA and DNA. At small concentrations, this dye, adsorbed on the surface of DNA, RNA or HP1, does not show any specificity to certain nucleotides. In the case of unwound sites of DNA or HP1, it can bind inside, but without the intercalation stacking with nucleotides. The energy transfer from nucleotide chromophores to Hoechst is absent due to their remoteness and also “bad” (non-stacking) orientation. The mutual fluorescence quenching of Hoechst by actinomycin D (AMD) and, vice versa, of 7-amino-actinomycin D (7AAMD) by Hoechst in DNA and HP1 is observed. It is due to dynamic deactivation and mutual replacing in binding sites.
