Tissue distribution and ontogeny of steroid 5 alpha-reductase isozyme expression

Phloem is an equally important plant tissue as it also is part of the 'plumbing system' of a plant. Primarily, phloem carries dissolved food substances throughout the plant. This conduction system is composed of sieve-tube member and companion cells, that are without secondary walls. The parent cells of the vascular cambium produce both xylem and phloem. This usually also includes fibers, parenchyma and ray cells. Sieve tubes are formed from sieve-tube members laid end to end. The end walls, unlike vessel members in xylem, do not have openings. The end walls, however, are full of small pores where cytoplasm extends from cell to cell. These porous connections are called sieve plates. In spite of the fact that their cytoplasm is actively involved in the conduction of food materials, sieve-tube members do not have nuclei at maturity. It is the companion cells that are nestled between sieve-tube members that function in some manner bringing about the conduction of food. Sieve-tube members that are alive contain a polymer called callose, a carbohydrate polymer, forming the callus pad/callus, the colourless substance that covers the sieve plate. Callose stays in solution as long as the cell contents are under pressure. Phloem transports food and materials in plants upwards and downwards as required.

Exercise:   To experience the mechanical quality of loose connective tissue, try the following.  (1) Pinch the skin of one cheek between thumb and forefinger.  (2) Hold the lining (mucosa) of that cheek between your teeth.  (3) Then move the skin relative to the lining.  See how far the two surfaces can move relative to one another.  The freedom is due to the looseness of the intervening connective tissue.  The limits are set by the collagen fibers which become straightened until taut.

Careers in the tissue sector range from research and engineering to logistics and operations to marketing and sales. If you are you interested in joining the tissue industry, check TAPPI’s career center .

To learn more about employment opportunities at AF&PA tissue member companies, please use the links below:

Clearwater Paper
Essity
Georgia-Pacific
Marcal, A Soundview Paper Company, LLC
The Procter & Gamble
Resolute Forest Products
Seaman Paper Company
Wausau Paper
White Mountain Tissue, LLC

The ground substance may be liquid, as in blood; gelatinous, as in areolar tissue; rubbery, as in cartilage; or calcified and stony, as in bone. It consists mainly of water and small dissolved ions and organic molecules, but the gelatinous to rubbery consistency of some tissues results from enormous protein-carbohydrate complexes in the ground substance. The hard consistency of bone results mainly from calcium phosphate salts in the ground substance.

Tissue distribution and ontogeny of steroid 5 alpha-reductase isozyme expression

tissue distribution and ontogeny of steroid 5 alpha-reductase isozyme expression

The ground substance may be liquid, as in blood; gelatinous, as in areolar tissue; rubbery, as in cartilage; or calcified and stony, as in bone. It consists mainly of water and small dissolved ions and organic molecules, but the gelatinous to rubbery consistency of some tissues results from enormous protein-carbohydrate complexes in the ground substance. The hard consistency of bone results mainly from calcium phosphate salts in the ground substance.

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