Vegetable chemical composition

Most waxes are complex mixtures of molecules with different carbon lengths, stmctures, and functionaHty. Attempts to measure the exact chemical composition are extremely difficult, even for the vegetable waxes, which are based on a relatively few number of basic molecules. Products such as oxidised microcrystaHine wax not only have a mixture of hydrocarbon lengths and types as starting materials, but also add complexity through the introduction of various types of carboxyHc functionaHty onto those hydrocarbons during the oxidation process. 

The chemical composition of the natural resins is very diverse, and their molecular structure may be highly complex most resins of vegetable origin, however, are chemically related to the carbohydrates. Dry vegetable resins... 

Okra, Hibiscus escuentus L. The immature pods of okra are popular as a vegetable and okra is also used for the ability to thicken soups and stews, and for fiber and oil. Notmuch is known about okra most workers concentrate their research on the chemical composition (26-29) of the mucilaginous materials found in the pod (30) stalk, nutritional properties (31). Research has also been conducted on the developmental properties of the okra seed (32). This paper is the first report of the chemical composition of auxin conjugates in okra pods bound to nitrocellulose membrane. 

Here we present the results of a preliminary study to investigate the chemical composition of secretions from carpal glands of feral pigs living in densely vegetated, humid tropical lowland rainforest habitats with a view to exploiting semiochemicals to improve trapping efficiency and to identify repellents. 

All of the studies were conducted with weanling, male albino rats of the Sprague-Dawley strain (Holtzman company). The basal diet used for these studies consisted of casein, starch, vegetable oil, vitamin and mineral mixtures, and cellulose. The Wesson Modification of the Osborne-Mendel mineral mixture was used in all studies. This mineral mixture contained no zinc, but it was adequate in the other minerals required by the rat. Most of the non-zinc-supplemented diets used in the various experiments contained approximately 7 ppm zinc. The level of mineral mixture used in the basal diets was 4%, and based on the chemical composition of the mixture, the basal diets contained approximately 0.57% calcium and 0.41% phosphorus ... 

Mnshrooms are important in the ecosystem because they are able to biodegrade the substrate and therefore use the wastes of agricultural production [1]. Mushrooms have also been reported as therapeutic foods, useful in preventing diseases such as hypertension, hypercholesterolemia, and cancer. These functional characteristics are mainly due to their chemical composition [2]. Heavy metal concentrations in mushroom are considerably higher than those in agricultural crop plants, vegetables and fmit. This suggests that mushrooms possess a very effective mechanism that enables them readily to take up some heavy metals from the ecosystem. 

The chemical composition of the organic matter derived from lake plankton typically is considerably higher in proteins and fats than that derived from terrestrial vegetation. 

Clay is an erosion product of igneous and sedimentary rocks. The weathering proceeds via mechanical and chemical processes. Its result depends on many factors, among which climate, vegetation and composition and texture of the rocks. 

Golchin, A., Clarke, P., Baldock, J. A., Higashi, T., Skjemstad, J. O., and Oades, J. M. (1997). The effects of vegetation and burning on the chemical composition of soil organic matter in a volcanic ash soil shown by 13C NMR spectroscopy. I. Whole soil and humic acid fraction. Geoderma 76,155-174. 

Vegetation has been classified into a number of reaction types (Ernst, 1993). Within the group of plants that react to their environment (reactors), those with visible (or overt) reactions can be distinguished from those with non-visible (or covert) reactions. In the case of geobotany as defined by Ernst (1993), visibility means to the unaided human eye, that is colour, morphology, presence, abundance or absence of species. Cole has pointed out (Cole and Smith, 1984) that is was not until about 1945, when rapid routine methods of analysis for large numbers of samples became available, that biogeochemistry, that is the study of the chemical composition of plants from various habitats, was used for mineral exploration in many parts of the world. 

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