不同茶梅品种花朵挥发性成分研究

为了探明不同茶梅品种花朵挥发性成分的差异,该研究采用固相微萃取和气相色谱-质谱联用技术,分析了6个茶梅品种花朵挥发性成分及其相对含量。结果表明:‘冬星’挥发性成分为29种,‘小玫瑰’24种,‘冬玫瑰’42种,‘昭和之荣’25种,‘新乙女’31种;5种茶梅品种花朵挥发性成分及相对含量有较大差异,但其主体特征成分均为苯乙酮、顺式-芳樟醇氧化物及芳樟醇;成分分类以醛酮类和醇类为主。完全重瓣型茶梅‘富士之峰’挥发性成分为21种;主体特征成分分别是顺式-芳樟醇氧化物、丁香醇、环己酮和十四烷;成分分类以醇类为主,其次为烷烃类。不同茶梅品种花朵挥发性成分化合物种类和相对含量差异较大;雄蕊、花瓣是挥发性成分释放的主要部位。

Belgian Emrepreneurs＇ Motivations： Proposition of a Typology

The aim of this paper is to perform a typology of Belgian entrepreneurs based on their motivations and to determine whether they are ＂motivated＂ or ＂forced＂ to create their firms. The authors used the methodology of the principal component analysis followed by an algorithm of classification to categorize groups of entrepreneurs. These groups were characterized by qualitative and quantitative variables. If the quantitative data were extracted from the firms＇ financial report and financial statements, the qualitative data were collected by means of a survey of Belgian entrepreneurs. The empirical study, made from a sample of 94 firms （representative of 10,728 firms）, confirms that the main motivations of Belgian entrepreneurs are positive （the need for autonomy, achievement, power, etc.） and are the same as in the literature. The study identifies five groups of entrepreneurs from the most highly-motivated one （46.81% of the entrepreneurs） to the ones （3.19%） who are forced into the entrepreneurship.