Are matrix isolated species really “isolated”? Infrared spectroscopic and theoretical studies of noble gas-transition metal oxide complexes

In this review, we summarize our recent results on matrix isolation infrared spectroscopic studies and theoretical investigations of noble gas-transition metal oxide complexes. The results show that some transition metal oxide species trapped in solid noble gas matrices are chemically coordinated by one or multiple noble gas atoms forming noble gas complexes and, hence, cannot be regarded as isolated species. Noble gas coordination alters the vibrational frequencies as well as the geometric and electronic structures of transition metal oxide species trapped in solid noble gas matrixes. The interactions between noble gas atoms and transition metal oxides involve ion-induced dipole interactions as well as chemical bonding interactions. Periodic trends in the bonding in these noble gas-transition metal complexes are discussed.

一种葡萄贵腐灰葡萄孢的筛选鉴定

为筛选可用于“人工贵腐葡萄酒”酿造的灰葡萄孢菌株,采用改良PDA培养基分离方法,从感染了灰霉病的果蔬组织中分离纯化出灰葡萄孢(Botrytis cinerea)疑似菌株,在乳酸石碳酸棉兰染色液染色下用显微镜对其进行形态学观察,并对其rDNA-ITS序列和RAPD片段进行扩增,对ITS序列进行测序,确定其灰葡萄孢的真菌分类地位。在不同pH值、不同侵染时间下,比较模拟葡萄汁中筛选菌株所产β-葡萄糖苷酶的活性,β-葡萄糖苷酶活性大小由模拟汁在400 nm处吸光值量化确定。研究发现,筛选的3株菌的β-葡萄糖苷酶活性均在pH值为6.0时最强,且 Botrytis-C菌株活性最高,Botrytis-T 所产β-葡萄糖苷酶的耐酸性较好;不同时间侵染的模拟汁中β-葡萄糖苷酶活性差异明显,Botrytis-C所产β-葡萄糖苷酶受侵染时间的影响最大,最不稳定。确定产孢能力强的两株灰葡萄孢适用于酿造“人工贵腐酒”的原料处理,菌株β-糖苷酶活性测试结果显示Botrytis-T用于葡萄“人工贵腐”的应用潜力更好。

人工贵腐葡萄酒的研制(Ⅰ)——灰葡萄孢的分离方法

本文详细地介绍了人工贵腐发酵菌——灰葡萄孢的分离和保藏方法,对该菌的培养方法、生长形态和部分生理生化特征作了详细描述。