Comparative analysis of structures of essential oils of some kind of tree species abies

Conditions of the chromatography analysis of essential oils providing an exit of all components with the contents over 0.01% are selected up. Essential oil from five kinds of the fir growing in identical climatic and soil environments is received by the method of hydrodistillation. The qualitative and quantitative analysis of essential oils is carried out. In the structure of essential oils 38 components are identified. The obtained data can be used for practical application of fir essential oils

Project of method developing of quality control of spruce essential oil by gas-liquid chromatography

Conditions of the chromatography analyses of essential oils providing the yield of all components with the contents over 0.01% were selected. Essential oils of 10 samples of Norway spruce growing in the same edaphic-climatic conditions of the park UE “Brovki” were obtained by hydrodistillation. Qualitative and quantitative analyses of the received essential oils were performed. More than 50 components composing the essential oil were identified. The obtained statistic data allowed to calculate standard deviation of repeatability, standard deviation of intermediate precision with a variable factor “time + operator”, expanded uncertainty of measurement results for the confidence level P = 0,95

Cambrian rhynchonelliform nisusioid brachiopods : phylogeny and distribution

A comprehensive review and phylogenetic analysis of genera and species presently assigned to the rhynchonelliform superfamily Nisusioidea and family Nisusiidae suggests that this short-lived but important group of brachiopods first appeared in peri-Gondwana during the second half of the Cambrian Series 2, before going extinct by the end of Drumian times. Nisusiides achieved their maximum morphological disparity and geographical distribution during the Wuliuan Age, and Laurentia was probably the major centre of their dispersal. A new phylogenetic analysis suggests an early separation of the lineages of spinose and non-spinose nisusiids. The non-spinose nisusiids probably evolved in Laurentia by the end of Cambrian Series 4. The new nisusiid genus Bellistrophia is described. The new species Nisusia multicostata represents the first documented rhynchonelliform (kutorginide) brachiopod from the Miaolingian (Drumian) of the Alborz Mountains, Iran