Joint Study on The Utilization of Biological Resources

1993年至1995年，山口大学与泰国高等学府就泰国生物资源的发现和利用进行了合作研究，特别是在园艺、微生物学、食品化学和土壤有机学等领域。调查了泰国中部、西部和东南部地区姜属植物和其他生姜的分布情况，并在Kasetsart大学的苗圃中保存了约300株植物。泰国的万达及其种群在野生状态下几乎丧失了盆花价值，因此从商业苗圃中采集了24种30株杂交种，通过对它们的生长和开花行为的观察，发现它们在日本是可以栽培的。在60ﾟC、65%相对湿度条件下与半乳甘露聚糖偶联制得的泰国大豆蛋白的乳化性和乳化稳定性分别是大豆蛋白本身的2.5倍和7倍，可作为蛋白质乳化剂应用于热加工食品中。红萍和稻草在热带土壤的长期肥力水平上被证明是有效的，尽管这两种植物在生物量形成方面都是同样有效的。在泰国采集的耐热醋酸菌也具有在37-40ﾟC生长的特性，能够根据其表型特征分为几个组。其中一些菌株可用于高温下的食醋发酵，另一些菌株可作为酒精和乙醛脱氢酶的来源，用于从食品原料中去除有害物质。

Cooperative studies between Yamaguchi and kasetsart universities, on the detection and utilization of biological resources in Thailand, especially in the fields of horticulture, microbiology, food chemistry and soil organic science were conducted from 1993 to 1995.Distribution of Curcuma species and other zingibers was surveyed in central, western and southeastern areas in Thailand and about 300 plants were conserved in the nurseries of Kasetsart University. Vanda and its group in Thailand, valuable as pot flowers, were almost lost in the wild state and thus 24 kinds of species and 30 plants of the hybrids were collected from commercial nurseries and were found possible to cultivate in Japan, after observations of their growth and flwering behaviors. Propagation by sawing immature seeds of endangered Thailand orchids, especially Paphiopedilum and Vanda coerulea, resulted to improve percent success.Both emulsifying property and emlusion stabillity of the protein, which was obtained from the Thailand soybeans and treated to conjugation with galactomannan under the conditions of 60ﾟC and 65% relative humidity, were found 2.5 and 7 times higher respectively, than those of soy protein proper and these characteristics are useful for heat-processing foods as a protein emulsifier.Addition of any kind of tropical plants in soil is favorable for the increase of microbial biomass. Azolla was proved effective for N abailability and rice straw was useful for longterm fertility level of tropical soil although both plants were equally efficient in biomass formation.Thermotolerant acetic acid bacteria, collected in Thailand and also having a property to grow at 37-40ﾟC,were able to divide into several groups according to their phenotypic characteristics. Some of them revealed to be useful for vinegar fermentation at high temperature and some other strains were found useful as sources for alcohol and aldehyde dehydrogenases for off-favor elimination from food materials.