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The direction of the electric field determines the polarization of light, and crystals will respond in different ways if this angle is changed. These kinds of crystals have one or two optical axes. If absorption of light varies with the angle relative to the optical axis in a crystal then pleochroism results. [4]
Cherry angioma, also called cherry hemangioma [1] or Campbell de Morgan Spot, [2] is a small bright red dome-shaped bump on the skin. [3] It ranges between 0.5 – 6 mm in diameter and usually several are present, typically on the chest and arms, and increasing in number with age.
Most other mammals are currently thought to be dichromats, with only two types of cone (though limited trichromacy is possible at low light levels where the rods and cones are both active). [5] Most studies of carnivores, as of other mammals, reveal dichromacy ; examples include the domestic dog , the ferret , and the spotted hyena .
A petechia (/ p ɪ ˈ t iː k i ə /; [1] pl.: petechiae) is a small red or purple spot (≤4 mm in diameter) that can appear on the skin, conjunctiva, retina, and mucous membranes which is caused by haemorrhage of capillaries. [2] [3] The word is derived from Italian petecchia 'freckle', of obscure origin. [1]
Reddish lesions at first then enlarges and becomes white to light brown in the centre. Circular and varying in size. Can appear concentric with red margins. Leaf spot on most cereals and grasses, field crops, vegetables, ornamentals, and trees. Myrothecium roridum: Target-like spots with light brown centres and dark circumference on Gardenia ...
The rhizosphere is the thin area of soil immediately surrounding the root system. It is a densely populated area in which the roots compete with invading root systems of neighboring plant species for space, water, and mineral nutrients as well as form positive and negative relationships with soil-borne microorganisms such as bacteria, fungi and insects.
Step Three: Remove Streaks. Combine one part vinegar and one part water in a bowl. Dampen a clean microfiber cloth with the mixture and apply it to the glass, wiping it down well for a streak-free ...
An ecchymosis is a hematoma of the skin larger than 10 mm. [2] They may occur among and or within many areas such as skin and other organs , connective tissues , bone , joints and muscle . A collection of blood (or even a hemorrhage ) may be aggravated by anticoagulant medication (blood thinner).