Through the Leaves

Vegetable fibers are classified according to their source ia plants as follows (/) the bast or stem fibers, which form the fibrous bundles ia the inner bark (phloem or bast) of the plant stems, are often referred to as soft fibers for textile use (2) the leaf fibers, which mn lengthwise through the leaves of monocotyledonous plants, are also referred to as hard fibers and (J) the seed-hair fibers, the source of cotton (qv), are the most important vegetable fiber. There are over 250,000 species of higher plants however, only a very limited number of species have been exploited for commercial uses (less than 0.1%). The commercially important fibers are given ia Table 1 (1,2). 

Water is absorbed by the plant through the roots and transpired through the leaves, mainly during daylight. The transpiration stream provides soil nutrients in solution and keeps the grass plants turgid. This turgidity ensures optimal photosynthesis by the leaves. 

Through the leaves and branches I could see Mark looking up. Maybe because he d made me jump, my heart started to slam more than usual. If you re not busy. ... 

For drug substances from plants, examples of contaminant impurities could be herbicides, for example, diquat and glyphosate, or pesticides, for example, carbofuran and endrin, sprayed in the environment. Additionally, heavy metals or polycyclic aromatic hydrocarbons, if present in the soil, may be absorbed through the root systems of the plants. Polycyclic aromatic hydrocarbons, if present in the air, may be absorbed through the leaves of the plant. These contaminants will be present as residues in the drug substance if the selection, cleaning, extraction, and purification processes do not reduce or eliminate them. 

A GROWING PLANT IS THE MOST ASTONISHING CHEMICAL FACTORY ON EARTH. THE GREEN SUBSTANCE IN LEAVES—CALLED CHLOROPHYLL—WITH THE HELP OF SUNLIGHT IS ABLE TO COMBINE WATER (TAKEN IN BY THE ROOTS) WITH CARBON DIOXIDE FROM THE AIR (TAKEN IN THROUGH THE LEAVES) TO FORM SUGAR FIRST AND THEN STARCH. 

Many fertilisers for the treatment of deficiencies of trace elements are added to the leaves. In addition, uptake of trace elements from aerial sources through the leaves may have a significant impact on plant contamination, especially of elements such as Fe, Mn, Zn and Cu. Anthropogenic aerosols have been reported to bring about foliar deposition of Pb to a great extent (Streit and Stumm, 1993). Zieve and Peterson (1984) have reported the assimilation of diemethyl selenide through leaves of terrestrial plants. Roberts et al. (1975) found a significant absorption of foliar-applied Zn, Fe, Cd and Mg. 

Photorespiration could be overcome if Rubisco could receive CO2 more efficiently than by diffusion through the leaves. Various C4 plants, including grasses such as maize (com) and bamboo, have evolved a bypass system for the delivery of CO2 to Rubisco. 

Plant Growth Regulator taken up into xylem through the leaves, stems or roots and translocated to the growing sub-apical meristems. Produces more compact plants and enhances flowering and fruiting... 

These insecticides range from completely water-miscible compounds to essentially insoluble ones, as indicated in Table VI. Most highly water-soluble insecticides are systemic, that is, they are absorbed into the tissues of the growing crop, either through the leaves or through the roots. But some water-miscible compounds are so unstable that their toxicity is destroyed before systemic activity can be observed (12,18). Tepp, for example, has a half life in water of only 8 hours. While many other compounds in this class have only limited solubility in water, they are still effective systemics. Examples are demeton, methyl demeton, and phorate. 

Imidacloprid or l-[(6-chloro-3-pyridyl methyl]-N-nitro-2-imidazol idinimine Neonicotinoid Systemic uptake by plant and further distributed through the leaves, acts through central nervous system of insects Control of sucking insects, termites, biting insects 11-16... 

It is possible to remove precoat liquid from the filter by using air to blow the liquid through a drain valve at the bottom of the filter tank, while blowing air through the leaves at the same time to hold the precoat in place. It is hydrauhcally impossible to blow any significant amount of liquid through the leaves. The precoat may also be held in place by vacuum while the filter is drained. After all precoat liquid is blown from the filter, it can be filled with unfiltered liquid and filtration can then proceed. 

Through the Leaves, Great Western Sugar Co., Denver, Col., semiannual. 

Anna takes the doll and runs off with it. Meryl follows in fast pursuit. WE FOLLOW AS THEY DASH THROUGH THE WOODS. THE CAMERA FOLLOWS THEM AS THEY DART THROUGH THE LEAVES AND BRANCHES. Meryl almost catches up, only to fall. Anna gains some distance once again, Meryl gains on her. Meryl stops to catch her breath and loses sight of Anna, then catches sight of her dress. Off she runs. 

Iodo-N-phenylbenzamide, benodanil (6), has a more powerful effect on rust fungi of cereals Puccinia spp.) than mebenil, and is also effective against the rust fungi of coffe, tobacco, vegetables and ornamental plants (Pommer et al., 1973 Locheret al., 1974). This active substance is better tolerated by plants than mebenil. It has a curative and systemic action. Its absorption through the leaves depends on the formulation of the active substance. It is more rapidly absorbed from emulsions and oily preparations than from suspension. Its translocation is relatively slow (Frost et al., 1973). 

Unlike TCA, dalapon is also absorbed through the leaves. Its effect can be enhanced by the addition of surfactants. It is used for selective weed control in sugar cane, sugar beet, maize, potato and in orchards. 

Fenoxaprop-ethyl is absorbed through the leaves and moves in both the xylem and the phloem. The actual site of action is the meristematic tissue of the shoot where it accumulates (Kocher et al., 1982). In plants the compound rapidly degrades to polar products. In soils it is saponified and in 32 days a complete degradation takes place. 

Dichlobenil is apoplastically translocated in the plants, and most of it volatilises through the leaves. The residual part is metabolised to 3- and 4-hydroxy derivatives, and these form conjugates (Verloop and Nimmo, 1969, 1970). 

Unlike propham, it is absorbed also through the leaves and is selective also at higher temperatures and lower moisture content. 

Proximpham is a selective soil herbicide, but it is absorbed also through the leaves. It is used in beet, onion, vegetables and ornamental plant cultures for the control of Compositae, Labiatae and Cruciferae weeds, which are tolerant to the other phenylcarbamates. 

Asulam is used pre- and postemergence as a selective herbicide. In plants it is translocated mainly basipetally with the nutrient stream. Absorption through the leaves can be considerably increased with surfactants. 

Plants absorb both herbicides mainly through the leaves. Absorbed compounds are transported by the transpiration stream in the plant. Light and heat increase herbicidal action however, when applied at temperatures above 25°C, they are not detrimental to the yield, sugar content, nitrogen content or soluble ash content of sugar beet (Schering, 1968, 1973). 

It is irreversibly adsorbed by the soil (Upchurch, 1958), and is easily absorbed through the roots of the plants, while it is not absorbed through the leaves. 

Metobromuron taken up through the roots is translocated into the transpiration system. The compound taken up through the leaves also flows basip>etally, unlike monolinuron (Voss and Geissbiihler, 1966). 

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