Big Chemical Encyclopedia

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

Articles Figures Tables About

Plant and extraction

Psychotropic agents, in today s sense of the term, were classified by Schneider into the classes narcotic agents and excitants, analeptics . The list of allegedly useful substances, plants and extracts is extensive and colorful. Critical evaluation of the recommended active agents is hampered by the fact... [Pg.32]

Large agricultural plots were necessary to grow the plants used to make dyestuffs. Extensive labor was necessary to harvest those plants and extract the limited amount of available dyestuffs, making the dyes very expensive to use. [Pg.176]

Whether the strategy will be to use plants and extracts directly to improve health and nutrition or indirectly for income generation so that famihes and communities can use the additional income to purchase food, medicines, school fees and clothes can both be pursued. In both cases, a better understanding of the markets for these natural products and the role(s) that this sector can play in local and regional economic development is key regardless of whether internationally trade is the objective, as the ecomomic impact will be felt locally for each of the intended markets. Furthermore, many parts of the plant species are also used in making different products such as handicrafts, mats, brooms and other household utensils in addition to the more health and medicinal applications. [Pg.9]

International Trade Centre (ITC), Medicinal Plants and Extracts, Issue 27, International Trade Centre Switzerland, 2008, p 67. [Pg.28]

Harvesting plants and extracting venom for raw materials is the least expensive method of obtaining poisons and poison components. A great deal of material can be gathered when abundant and stored for later. Many assassins will cultivate a secret garden or snake pit for this purpose. Besides being inexpensive and convenient, it insures the assassin a measure of secrecy and assures quality poisons. [Pg.12]

Whether an element is present naturally in the soil or has been introduced by pollution, a measure more useful than total elemental content for most purposes is an estimation of availability or lability of the element, since it is this property that can be related to mobility and uptake by plants and extractability by chemical treatments. Chemical soil tests are designed to extract a quantity of the element from the soil solids that correlates statistically to the size of the available pool in the soil, defined by the quantity of element taken up by plants. Thus, soil tests are empirical, giving little insight into the chemical mechanisms in the soil that control availability. They estimate the potential for toxicity (or deficiency) to plants and animals. However, the extractability of different elements depends on their properties, such as their tendency to ... [Pg.309]

Many specifics about anticanc plants and extracts worldwide are compiled in Chapter 3, Seetion 3.3, and in the appendices of Hoffman (1999a). We add periphaal information here. Prominent names of persons involved in collecting this anticancer information include Jonathan Hartwell, of course, plus James A. Duke, Geoffrey A. Cordell (alkaloids), Edward S. Ayensu, Robert A. DeFillips, John Heinerman, and Ralph Moss, to name a vray few. [Pg.245]

Tire strength of this study is that it combines both fieldworks and results from scientific investigations of listed plants which include biological activities of extracts and active compounds. Traditional uses of plants and extracts activities are presented, and active products obtained from some of these plants are reviewed. [Pg.804]

Eisei KK. JP 024116, 29-02-1980. Isobutyroyl-tropine and valeryl-tropine preparation by culturing callus derived from Duboisia plant and extracting cultured cells. [Pg.54]

The dimensions of cells (length, diameter) are highly variable, dependent on species, maturity, location (position) within the plant, and extraction procedures. Meaningful comparisons can be made only in terms of orders of magnitude. Harris [58] collected the most comprehensive set of data from different sources. Table 8.2 is a composite of these, and other data, for fibers of interest and some for purposes of comparison. From these data, it is quite clear that, on average, the unit cells of ramie, flax, and hemp are longer and coarser than the cotton fiber jute, abaca, and hemp yield the longest fibers, and abaca, henequen, and sisal yield the coarsest fibers. [Pg.475]

Numerous plant species have been reported to be resistant to attack from subterranean termites. Many of these plants and extracts derived from them were tested for leads as potential natural product basexl pesticides. Forty plant and tree extracts reported to be active against termites displayed poor activity against the Formosan subterranean termite at rates < 0.5% wt/wt. Most naphthoquinones were active with a non-polar substitution in the 2-position. Anthroquinones generally had little termiticidal activity. None of the plant extracts or natural products tested were sufficiently active to be considered useful for control of the Formosan subterranean termite without structural modification. [Pg.73]

Sugar and starch are among those organic chemicals found so abundantly in nature that no serious efforts have been made to synthesize them commercially from coal (or petroleum), air, and water. Both are available at such concentrations in some plants that sizable industries have resulted from growing those plants and extracting carbohydrates therefrom. [Pg.315]


See other pages where Plant and extraction is mentioned: [Pg.63]    [Pg.63]    [Pg.24]    [Pg.617]    [Pg.63]    [Pg.709]    [Pg.680]    [Pg.189]    [Pg.182]    [Pg.9]    [Pg.680]    [Pg.146]    [Pg.877]    [Pg.289]    [Pg.509]    [Pg.300]    [Pg.94]    [Pg.302]   
See also in sourсe #XX -- [ Pg.38 ]




SEARCH



Plant extracts

© 2024 chempedia.info