Demo: Module 2 – Natural fibres

Demo: Module 2 – Natural fibres


Welcome to the Knowledge-Academy-online. This demo is concerned with Natural Fibres. The use of the Crisper/Cas9 complex for genome editing was the  triple A’s choice for breakthrough of the year in 2015. There is no apparent reason why, this affordable technique should
not be used for fiber genetic engineering. Learn more in unit 1. Silk is a protein fiber and consist of amino acids. The physical characteristics
of the fiber are determined by the structure of the macromolecule
composing the fibroin. Learn more in unit 2. Merino wool is typically 3 to 5 inches
(or 76 to 127 millimeters) in length and is very fine (between 12 and 24 microns).  The finest and most valuable wool
comes from Merino hoggets. Wool taken from sheep produced
for meat is typically coarser, and has fibers 1.5 to 6 inches (38 to 152 mm) in length. Damage or breaks in the wool can occur if the
sheep is stressed while it is growing its fleece, resulting in a thin spot where
the fleece is likely to break. Learn more in unit 3. Cashmere is collected during the spring  moulting season when the
goats naturally shed their winter coat. Learn more in unit 4. The down hairs of the angora rabbit are
60 millimeters long and very smooth, with few cuticle scales. The diameter is around 14 microns, which makes the down angora hairs one of the
finest animal fibers used in textiles. Learn more in unit 4. In good quality mohair, medullated fibres can be a source of problems in many end-uses when they differ in appearance from the rest of the fibres which are not medullated. Learn more in module 5. Royal Alpaca is finer than 18 microns. What is it about alpaca
that makes it so versatile? Learn more in unit 6. The vicuña wool is extremely smooth,
soft and an excellent thermal insulator. Its properties come from its small diameter,
the tiny scales, and
the hollow, air-filled fibres. Learn more in unit 7. This table compares diameters of most natural fibres, including some less common ones, such as muskox,
yak, camel and a few others. Learn more in unit 7. Asbestos is a set of six naturally occurring silicate minerals. Learn more in unit 7. The MFA is the microfibrilar angle, and gives an
indication of the orientation of the microfibrils in the fibre. A lower MFA is correlated with
a higher strength and stiffness of the fibre. Learn more in unit 8. In flax, the length of individual flax
fibres varies between 6 to 65 millimeters, but on average they are about 20 millimeters long. Learn more in unit 9. This table shows typical values of some of the
mechanical properties and density of hemp fibres. Learn more in unit 10. Jute fibres are multi-cellular fibres, with very small individual cells bonded
together into long strands in the plant stem. Learn more in unit 10. The composition of ramie fiber is 68 to 76% cellulose. Learn more in unit 11. This table shows typical values of some of the
mechanical properties and density of sisal fibres. Learn more in unit 11. The coir cell or elementary fibre is about
10 to 20 microns in diameter.   Learn more in unit 12. The table shows some characteristics
less conventional plant fibres. Learn more in unit 12. Please logon to acoknowledge.org
and choose the module on Natural Fibres.

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