红头豆芫菁成虫芫菁素含量的研究

芫菁素在红头豆芫菁体内主要贮存在雄虫的生殖腺和卵内。与野生群体两性芫菁素的平均含量相比较,刚交配过的雄虫失去体内７０％的芫菁素,其雌配偶体内芫菁素含量相应升高４３％。红头豆芫菁可用作中药材。经１１０℃烘干后的雄虫,用酸水解后提取的芫菁素含量比直接提取的含量增高４倍。     

Endogenous levels of oxygen,carbon dioxide and ethylene in stems of Norway spruce trees during one growing season

Summary The trees sampled in this study came from two stands of Norway spruce, Picea abies (L.) Karst., near Stockholm, Sweden, differing in mean age and height. Holes were bored perpendicular to the stem surface, and gas samples were taken from the outer part of the sapwood throughout one growing season. Endogenous levels of molecular oxygen (O₂), carbon dioxide (CO₂) and ethylene in the outer sapwood were determined by combined gas chromatography — mass spectrometry (GC-MS) and GC. O₂ concentrations began to decrease as growth started in spring. The lowest levels (<5%) were recorded around mid-summer. In the younger stand concentrations remained below 5% until September. In October, O₂ concentrations in the sapwood were similar to those of air. Concentrations of CO₂ were below 1% in spring, but began to rise in May, peaking a month later at approximately 10%. Thereafter a slow decrease occurred until October, by which time levels had returned to those recorded in spring. Ethylene concentrations in the older stand reached 75 ppm early in May, while levels in the younger stand peaked at around 30 ppm later in May. Thereafter ethylene levels in both stands started to decrease down to ppb levels. The correlation between determined gas levels and physiological events associated with the seasonal growth cycle in temperate zones is discussed.     

三花莸挥发油化学成分的研究

用自制的水蒸气蒸馏－溶液萃取装置从马鞭草科莸属Ｃａｒｙｏｐｔｅｒｉｓ Ｂｕｎｇｅ植物三花莸Ｃ．ｔｅｒｎｉｆｌｏｒａ Ｍａｘｉｍ．中提取挥发油,含量为１．００３％,用毛细管气相色谱－质普法对其挥发油的化学成分进行了研究,含量为分离出５０多个组分,质谱鉴定了２５个成分,占总色谱峰面积的６３．７８％。三花莸挥发油 的主要组分为α－柠檬烯（３７．４０％）,（＋）－顺－桧醇（２６．９０％）,还含有α－蒎烯,