Storage function

Other plasma vitamin B 2 proteins, transcobalamines I and III, appear to have primarily a storage function and only a lesser role in transport. 

Barium oxide is not a catalyst all reactions involving this component are entirely stoichiometric. Nevertheless, as Fig. 10.10 illustrates, even when the barium storage function is saturated, the NOx content in the outlet gas from the catalyst is lower than in the inlet, owing to the capability of platinum to reduce NOx by hydrocarbons in oxygen-rich exhausts. 

The NOxTrap can be assimilated to a three-way catalyst7 complemented by a NOz storage function. This system contains two types of precious metals the first one, dedicated to NO, HC and CO oxidation in lean operating mode, will generally consist of platinum or palladium. The second one, dedicated to NOx reduction in rich operating mode, is typically rhodium. Rhodium price spectacularly increases, with a multiplication by three of its value in 2006 (see Figure 7.13)8. 

The seeds of dicotyledonous plants have two cotyledons, or seed leaves, which are part of the embryo. The cotyledons usually are the main storage tissue, although in some plants (such as castor bean) the endosperm also has a storage function. During development in the field, seeds gradually accumulate storage oils, proteins and carbohydrates (Table 3.1). In the seed, the cotyledon structure is relatively simple. The remainder of the embryo, the embryonic axis, consists mostly of undifferentiated cells, but provascular tissue can be detected that develops into vascular tissue in the seedling. 

We could not find other areas of primary metabolism in which QA might play a part. Since we can assume that all metabolites found in organisms have a definite function (19), we suggest that the nitrogen storage function of QA is of only minor importance and probably not sufficient to explain the complex physiology of QA. 

Glycogen, a homopolymer of glucose, is the major form of stored carbohydrate in animals and serves the energy storage function. Dietary carbohydrates that are not needed for immediate energy are converted by the body to... 

Thus, the enzyme also has a transport or storage function. 

FIGURE 12.2 Absorptive and storage functions of the large intestine. 

There are two additional postulated Mb functions that should be mentioned. First, Mb may serve as a simple intracellular 02 store. In muscles of marine mammals, Mb occurs at 8-12 times higher concentrations than in muscles of most other species, and it is in these kinds of settings that Mb is thought to play an intracellular 02 storage function (Hochachka and Foreman, 1994). Additionally, there is a linear relationship between the anaerobic capacity of muscles (as indicated by the amounts of lactate dehydrogenase, or LDH, that they contain) and their Mb content. This relationship probably arises because protons generated by anaerobic glycolysis may be buffered by intracellular Mb,... 

We now turn our attention to actual process systems operating away from equilibrium conditions. Such systems are forced ( 0), and while stationary are not at equilibrium. How can we investigate their properties through thex-modynamics The answer lies in an important result in systems theory due to Ydstie and Alonso (1997), who showed that exergy is a valid storage function for process systems and that such systems are dissipative. 

From a control standpoint it is desirable to find dissipative storage functions where the net supply of the stored quantity is a function of... 

Harrison. P. M. Arosio, P. The ferritins molecular properties, iron storage function and cellular regulation. 5/ocA/>w. Biophys. Acta. 1275 161-203 1996. 

Technical Nature. Wood is a complex plant tissue composed of several distinct types of cells. In the trees discussed in this text, wood is easily recognized as that tissue located to the inside of the tree bark and forming the interior bulk of all major stems, branches, and roots. Technically, wood is the main conductive and mechanical (or supportive) tissue of the tree, and is largely responsible for the upward translocation of water and dissolved minerals from the root system to the active tree crown (buds and functioning leaves) (J). The histological and cellular structure of wood and how it serves conductive, mechanical, and storage functions in the tree will be dealt with later in this chapter. 

Plant cell walls are the source of the greatest quantity of polysaccharides. Some cell-wall-associated polysaccharides may serve storage functions in addition to or rather than structural functions. Such polysaccharides include the -glucans [29,30], mannans [31], galactans [28], and arabinogalactans [23]. 

---