Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...

Articles Figures Tables About

Betula species

Fuchino, H. et al.. Chemical evaluation of Betula species in Japan. IV. Constituents of Betula davurica, Chem. Pharm. Bull, 46, 166, 1998. [Pg.723]

Open chain diarylheptanoids were isolated from Acer nicoense (Aceraceae), from Alnus and Betula species Betulaceae), from Alpinia, Curcuma and Zingiber species belonging to the family of gingers Zingiberaceae) and finally from certain Cenirolobium species (Leguminosae). Individual compounds will be classified according to the plant families in which they occur. [Pg.358]

In the family of Betulaceae open chain diaryl-heptanoids were found in Alnus and Betula species. [Pg.359]

Betula species.49 The efficient conversion of (20S,24i )-20,24-epoxydammarane-3a, 12(3,25-triol into the 25-0-,3-D-glucoside has been reported.50 The seed oil of Cacalia atriplicifolia (Compositae) is a rich source of esters of dammarenediol II.51... [Pg.216]

Santamour F S Jr, Vettel H E 1978 The distribution of rhododendrin in birch (Betula) species. Biochem Syst Ecol 6 107-108... [Pg.398]

Seshadri T R, Vedantham N C 1971 Chemical examination of the barks and heartwoods of Betula species of American origin. Phytochemistry 10 897-898... [Pg.842]

Chars may be formed from a very wide range of materials, most notably cellulosic plant material. While no realistic limit can be placed on the sources that may have been employed historically, certain types have been expressed consistently in the hterature. These include bark chars (such as from Betula species, Swedish black , and Quercus suber L., corkblack ), fiuitstone chars,paper chars, wood chars (for example, from Vitis species to give vine black , and Fagus species, giving beech black ). The presence of alkali metal carbonates in wood chars has been noted by Winter. [Pg.83]

The dominant species are the spruce (Picea excelsa), the birch (Betula verrucosa, B. pubescens), the aspen (Populus tremula), and the alder (Aims incana). The moss and low bush layer is represented by the blueberry-bush (Vaccinium myrtiilus), hypnic mosses, separate species of cowberry (Vaccinium uliginosum) and flowering plants. The biomass of these Spruce Forest ecosystems reaches 10 ton/ha at the age of 100-150 years (Table 4). [Pg.148]

Certain tree species such as Betula pendula and Picea abies fail to develop in association with heather, Calluna vulgaris (40. 1). This apparently results from the production by heather of an allelochemical toxic to growth of mycorrhizae of Betula and Picea. Fruticose soil lichens are often allelopathic to the growth of mycorrhizae and forest tree seedlings also (42). Removal of reindeer moss (a lichen) in field tests resulted in accelerated growth of pine and spruce. [Pg.13]

Despite aU of betulinic add pharmacological potential, it is obtained by extrachon of barks or core of some plant species or by synthetic processes, e.g. using the betulin (alcohol triterpene) as a S)Tithetic intermediate isolated from the bark of Betula alba and Betula pendula [Galgon., et al. 1999]. Therefore, research is necessary to identify new natural sources, which produce large... [Pg.183]

Patterns of polyphenol accumulation In leaves vary among the few temperate forest species which have been studied. Feeny s (42) classic study on oak leaves (Quercus robur) shows leaf tannin levels rising slowly until August, and then Increasing sharply. In the cases of sugar maple (Acer saccharum) and yellow birch (Betula lutea) (44), respectively. [Pg.31]

Salicinum, Salicin, C13H1807, is a glucoside obtained from several species of Salix, the willow, and populus, the poplar, trees of the nat. ord. Salicaceae. It is found also in Gaultheria procum-bens, the wintergreen, nat. ord. Ericaceae and in Betula lenta, the sweet birch, nat. ord. Betulaceae the volatile oils of which, distilled from the leaves of the former and from the bark of the latter, consist almost entirely of methyl salicylate. [Pg.529]

Birch Tar Oil, Rectified, occurs as a clear, dark brown liquid with a strong leather odor. It is the pyroligneous oil obtained by dry distillation of the bark and the wood of Betula pendula Roth and related species of Betula (Fam. Betulaceae) and rectified by steam distillation. It is soluble in most fixed oils, but it is insoluble in glycerin, in mineral oil, and in propylene glycol. [Pg.50]

Fig. 8.1 Feeding preferences by free-ranging beavers Castor canadensis) for 3 species of northeastern deciduous trees and shrubs American beech (Fagus grandifolia), quaking aspen Populus tremuloides), striped maple (Acer pensylvanicum), witch hazel (Hamamelis virginiana), witch hobble (Viburnum lantanoides) and yellow birch (Betula alleghaniensis). The experiment was run over 10 days. Each morning the number of remaining sticks was counted. Only one of 10 beech sticks was taken after 10 days, while, at the other extreme, no sticks of aspen and striped maple remained after 4 and 5 days, respectively... Fig. 8.1 Feeding preferences by free-ranging beavers Castor canadensis) for 3 species of northeastern deciduous trees and shrubs American beech (Fagus grandifolia), quaking aspen Populus tremuloides), striped maple (Acer pensylvanicum), witch hazel (Hamamelis virginiana), witch hobble (Viburnum lantanoides) and yellow birch (Betula alleghaniensis). The experiment was run over 10 days. Each morning the number of remaining sticks was counted. Only one of 10 beech sticks was taken after 10 days, while, at the other extreme, no sticks of aspen and striped maple remained after 4 and 5 days, respectively...
Fig. 2.15 Element fractionations and effective electrochemical ligand parameters for photosynthetic organs of five plant species frequently occurring in forest understorey regions (fmm left to right) Vaccinium myrtillus (blueberry), Lolium perenne (ryegrass), Deschampsia flexuosa, Molinia caemlea and Vaccinium vitis-idaea (red whortleberry). For other domestic plants, E (L) values may be higher or lower than the average of the above values, e.g. -0.19 V for each Lolium perenne and Betula alba. Very low effective electrochemical hgand parameters (oak, dandehon, plants in tropical... Fig. 2.15 Element fractionations and effective electrochemical ligand parameters for photosynthetic organs of five plant species frequently occurring in forest understorey regions (fmm left to right) Vaccinium myrtillus (blueberry), Lolium perenne (ryegrass), Deschampsia flexuosa, Molinia caemlea and Vaccinium vitis-idaea (red whortleberry). For other domestic plants, E (L) values may be higher or lower than the average of the above values, e.g. -0.19 V for each Lolium perenne and Betula alba. Very low effective electrochemical hgand parameters (oak, dandehon, plants in tropical...
At the same time there are two major push factors at influence in the Highlands. The first is the move to increase the biodiversity of the area and to move away from extensive plantations of single species conifers of alien species. This is occurring through the regeneration of the traditional mixed native woodlands of Scots pine, (Pinus sylvestris), birch, (Betula alba and pendula) and other native trees and an under story of species such as juniper (Juniper communis), wild cranberries, (Vaccinium macrocarpa) and blaeberries, (Vaccinium myrtillus). [Pg.225]

The truffles are perhaps the most famous, and certainly the most expensive, of the edible mushrooms, being avidly sought-out for use in gourmet cooking, particularly in France. The best-known species of truffle is Tuber melanosporum, which is commonly mycorrhizal on species of oak, birch, and beech Quercus, Betula, snAFagus spp., respectively). Other Eurasian species of truffle include Tuber aestivum and T. brumale, while T... [Pg.462]

Increments in phenolics content after UV-B exposure have been recorded for a number of plant species (e.g. Caldwell et al., 1983 Chaves et al., 1997 Turunen et al., 1999). For example, a 10-fold increase in flavonoid concentration occurred in grape vine plants Vitis viniferd) exposed to natural sunlight relative to plants in which UV-A and UV-B radiation had been filtered out (Kolb et al., 2001). Similar responses include UV-B tolerant Arabidopsis mutants (Bieza and Lois, 2001) and lichens in which a clear attenuation of high frequency photons within the thallus was observed due to chemical filtration (Hall et al., 2002). Birch Betula... [Pg.953]

However, not all related species or conspecific populations respond similarly under the same UV influence. For example, Betula pendula and B. resinifera, two closely related birch species collected from populations in Europe and Alaska, generally produce a number of flavonoids, hydroxycinnamic acids, and condensed tannins in larger quantity in exposed leaves to artificial UV-B photon fluxes (4.9 kJ m d for 3 hr/day of biologically active radiation) than in non radiated plants (Lavola, 1997). In B. pendula populations the major increase was in flavonoid synthesis but in B. resinifera the bias was towards the hydroxycinnamic acids and condensed tannins. Besides, allopatric (geographically distant) populations of birch reacted differently in the synthesis of specific compounds. For example, chlorogenic acid increased by 22 and 92% in plants from Germany and Alaska, respectively, but in Finnish plants there was no increment at all. [Pg.959]

Rainfall is scarce and mild showers can be noticed during the months of May to September. The high velocity cold winds are common climatic feature of the area. Basically, there are two types of vegetation zones in the Lahaul valley (i) temperate zone (2400 to 3300 m), and (ii) alpine zone (above 3300 m) (Aswal and Mehrotra, 1994). Forest resources in the entire Lahaul valley are very sparse and scanty. The Chandra sub-valley has very few7 scattered trees of Betula utilis, Pinus wallichiana, Juniperus communis, J. indica, S. lindleyana and S. pycnostachya on almost denuded northern slopes southern slopes are almost barren. In the Pattan sub-valley, both the slope aspects have some patches of open forests. Juniperus macropoda is the most important tree species found on the south facing slopes. [Pg.53]


See other pages where Betula species is mentioned: [Pg.222]    [Pg.964]    [Pg.2923]    [Pg.392]    [Pg.222]    [Pg.964]    [Pg.2923]    [Pg.392]    [Pg.134]    [Pg.1696]    [Pg.18]    [Pg.152]    [Pg.301]    [Pg.337]    [Pg.177]    [Pg.210]    [Pg.27]    [Pg.33]    [Pg.55]    [Pg.299]    [Pg.310]    [Pg.47]    [Pg.236]    [Pg.40]    [Pg.94]    [Pg.38]    [Pg.64]    [Pg.319]    [Pg.127]    [Pg.94]    [Pg.282]   
See also in sourсe #XX -- [ Pg.17 , Pg.358 , Pg.361 ]




SEARCH



Betula

© 2024 chempedia.info