Plant cells, processing

Historically, dietary fiber referred to iasoluble plant cell wall material, primarily polysaccharides, not digested by the endogenous enzymes of the human digestive tract. This definition has been extended to iaclude other nondigestible polysaccharides, from plants and other sources, that are iacorporated iato processed foods. Cellulose [9004-34-6] (qv) is fibrous however, lignin [9005-53-2] (qv) and many other polysaccharides ia food do not have fiberlike stmctures (see also Carbohydrates). 

Mercury is emitted from the mercury cell process from ventilation systems and by-product streams. Control techniques include (1) condensation, (2) mist elimination, (3) chemical scrubbing, (4) activated carbon adsorption, and (5) molecular sieve absorption. Several mercury cell (chloralkali) plants in Japan have been converted to diaphragm cells to eliminate the poisonous levels of methyl mercury found in fish (9). 

In the membrane process, the chlorine (at the anode) and the hydrogen (at the cathode) are kept apart by a selective polymer membrane that allows the sodium ions to pass into the cathodic compartment and react with the hydroxyl ions to form caustic soda. The depleted brine is dechlorinated and recycled to the input stage. As noted already, the membrane cell process is the preferred process for new plants. Diaphragm processes may be acceptable, in some circumstances, but only if nonasbestos diaphragms are used. The energy consumption in a membrane cell process is of the order of 2,200 to 2,500 kilowatt-hours per... 

The bioreactor is the heart of any biochemical process in which enzymes, microbial, mammalian or plant cell systems are used for manufacture of a wide range of useful biological products. The performance of any bioreactor depends on many functions, such as those listed below ... 

A simple cell design is required to reduce capital costs. The cost of the raw materials, HF and electricity, are not negligible, but they are minor. The pilot plant cell design shown in Fig. 16 is derived from the callandria cell developed for the Phillips ECF process.14 The cell body and internals are of mild steel pipe selected to be resistant to hydrogen embrittlement. Figure 17 is a horizontal section through the working part of the cell. 

A more comprehensive review of the significance of these organic osmotica in the tolerance of plant cells to water stress can be found in a paper by Hasegawa et al. (1987). The significance of organic osmotica in tolerance processes of intact plant systems is discussed jn Chapters 7 and 8. 

The stress acting on particles is of high importance for many technical processes. As well as dispersion processes in two-phase systems (liquid/liquid or gas/Hquid), where the disintegration of particles is desirable, there are also a number of processes that may be adversely affected by particle disintegration. These include precipitation, agglomeration, crystalHsation processes, and also bio conversion with immobilised enzymes and the fermentation of sensitive microorganisms and animal and plant cells. 

Plant cell suspensions offer the potential to produce valuable phytochemicals, traditionally extracted from the naturally grown whole plant, under controlled and reproducible conditions. To date, commercial processes involving these systems have been limited to just a handful of applications, including the much-cited shikonin [1] and ginseng [2,3]. 

A similar approach has been suggested in other studies of plant cells [57] and protein precipitates [133]. However, information on the rate of the size distribution shift process cannot be inferred from chain-length measurements made only at the beginning and end of the experiment. To date, there have been no reports on the progressive modification of the size distribution of plant cells subjected to continued exposure to turbulent forces. There are, however, a number of studies which address the break-up of mycelial hyphae in agitated vessels... 

Work on the OB has clearly demonstrated that plant cell response to stress, including hydrodynamic stress, is a more complex process than was originally anticipated. Moreover, it highlights a number of cellular processes which may define immediate system response and longer term performance prospects of plant cell suspensions. 

Jervis L, Robertson ER (1987) In Webb C, Mavituna E (eds) Plant and animal cells process possibilities. Ellis Horwood, Chichester, p 216... 

In the interdisciplinary field of biophysics and biotechnology, the bioeffects of electric field have received considerable interest for both fundamental studies on these interaction mechanisms and potential application. However, the effects of pulsed electric field (PEF) on secondary metabolism in plant cell cultures and fermentation processes have been unknown. Therefore, it would be very interesting to find out whether PEF could be used as a new tool for stimulating secondary metabolism in plant cell cultures for potential application to the value-added plant-specific secondary metabolite production. Furthermore, if the PEF permeabilization and elicitation are discovered in a cell culture system, the combination of... 

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