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Bubble Hair Deformity
Bubble hair deformity is damage of the hair shaft, resulting in patches of short weak brittle hair, that feels rough. It is typically caused by chemicals and heat; temperatures greater than 125 °C on wet hair, such as with the use of hair dryers, hair straighteners and curling tongs. Definition Bubble hair deformity is damage of the hair shaft, resulting in patches of short weak brittle hair, that feels rough. Cause It is typically caused by chemicals and heat; temperatures greater than 125 °C on wet hair, such as with the use of hair dryers, hair straighteners and curling tongs. Mechanism Bubble hair is characterized by rows of bubbles seen microscopically within localized areas of the brittle hair. These air-filled spaces occur in the cortex of the hair shaft that correspond to the breakdown of keratin and local air expansion triggered by hot water passing through the shaft. There may be an inherited predisposition. It can be associated with trichorrhexis nodo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dermatology
Dermatology is the branch of medicine dealing with the Human skin, skin.''Random House Webster's Unabridged Dictionary.'' Random House, Inc. 2001. Page 537. . It is a speciality with both medical and surgical aspects. A List of dermatologists, dermatologist is a specialist medical doctor who manages diseases related to skin. Etymology Attested in English in 1819, the word "dermatology" derives from the Ancient Greek, Greek δέρματος (''dermatos''), genitive of δέρμα (''derma''), "skin" (itself from δέρω ''dero'', "to flay") and -λογία ''wikt:-logia, -logia''. Neo-Latin ''dermatologia'' was coined in 1630, an anatomical term with various French and German uses attested from the 1730s. History In 1708, the first great school of dermatology became a reality at the famous Hôpital Saint-Louis in Paris, and the first textbooks (Willan's, 1798–1808) and atlases (Jean-Louis-Marc Alibert, Alibert's, 1806–1816) appeared in print around the same time.Freedber ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hair Dryer
A hair dryer (the handheld type also referred to as a blow dryer) is an electromechanical device that blows ambient air in hot or warm settings for styling or drying hair. Hair dryers enable better control over the shape and style of hair, by accelerating and controlling the formation of temporary hydrogen bonds within each strand. These bonds are powerful, but are temporary and extremely vulnerable to humidity. They disappear with a single washing of the hair. Hairstyles using hair dryers usually have volume and discipline, which can be further improved with styling products, hairbrushes, and combs during drying to add tension, hold and lift. Hair dryers were invented in the late 19th century. The first model was created in 1911 by Gabriel Kazanjian. Handheld, household hair dryers first appeared in 1920. Hair dryers are used in beauty salons by professional stylists, as well as by consumers at home. History In 1888 the first hair dryer was invented by French stylist . His ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hair Iron
A hair iron or hair tong is a tool used to change the arrangement of the hair using heat. There are three general kinds: ''curling irons'', used to make the hair curl; ''straightening irons'', commonly called ''straighteners'' or ''flat irons'', used to straighten the hair; and ''crimping irons'', used to create crimps of the desired size in the hair. Most models have electric heating; cordless curling irons or flat irons typically use butane, and some flat irons use batteries that can last up to 30 minutes for straightening. Overuse of these tools can cause severe damage to hair. Types of hair irons Curling iron Curling irons, also known as curling tongs, create waves or curls in hair using a variety of different methods. There are many different types of modern curling irons, which can vary by diameter, material, and shape of barrel and the type of handle. The barrel's diameter can be anywhere from to . Smaller barrels typically create spiral curls or ringlets, and lar ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Microscopy
Microscopy is the technical field of using microscopes to view subjects too small to be seen with the naked eye (objects that are not within the resolution range of the normal eye). There are three well-known branches of microscopy: optical microscope, optical, electron microscope, electron, and scanning probe microscopy, along with the emerging field of X-ray microscopy. Optical microscopy and electron microscopy involve the diffraction, reflection (physics), reflection, or refraction of electromagnetic radiation/electron beams interacting with the Laboratory specimen, specimen, and the collection of the scattered radiation or another signal in order to create an image. This process may be carried out by wide-field irradiation of the sample (for example standard light microscopy and transmission electron microscope, transmission electron microscopy) or by scanning a fine beam over the sample (for example confocal laser scanning microscopy and scanning electron microscopy). Scan ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hair
Hair is a protein filament that grows from follicles found in the dermis. Hair is one of the defining characteristics of mammals. The human body, apart from areas of glabrous skin, is covered in follicles which produce thick terminal and fine vellus hair. Most common interest in hair is focused on hair growth, hair types, and hair care, but hair is also an important biomaterial primarily composed of protein, notably alpha-keratin. Attitudes towards different forms of hair, such as hairstyles and hair removal, vary widely across different cultures and historical periods, but it is often used to indicate a person's personal beliefs or social position, such as their age, gender, or religion. Overview Meaning The word "hair" usually refers to two distinct structures: #the part beneath the skin, called the hair follicle, or, when pulled from the skin, the bulb or root. This organ is located in the dermis and maintains stem cells, which not only re-grow the hair afte ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hair Dryer
A hair dryer (the handheld type also referred to as a blow dryer) is an electromechanical device that blows ambient air in hot or warm settings for styling or drying hair. Hair dryers enable better control over the shape and style of hair, by accelerating and controlling the formation of temporary hydrogen bonds within each strand. These bonds are powerful, but are temporary and extremely vulnerable to humidity. They disappear with a single washing of the hair. Hairstyles using hair dryers usually have volume and discipline, which can be further improved with styling products, hairbrushes, and combs during drying to add tension, hold and lift. Hair dryers were invented in the late 19th century. The first model was created in 1911 by Gabriel Kazanjian. Handheld, household hair dryers first appeared in 1920. Hair dryers are used in beauty salons by professional stylists, as well as by consumers at home. History In 1888 the first hair dryer was invented by French stylist . His ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Microscope
A microscope () is a laboratory equipment, laboratory instrument used to examine objects that are too small to be seen by the naked eye. Microscopy is the science of investigating small objects and structures using a microscope. Microscopic means being invisible to the eye unless aided by a microscope. There are many types of microscopes, and they may be grouped in different ways. One way is to describe the method an instrument uses to interact with a sample and produce images, either by sending a beam of light or electrons through a sample in its optical path, by detecting fluorescence, photon emissions from a sample, or by scanning across and a short distance from the surface of a sample using a probe. The most common microscope (and the first to be invented) is the optical microscope, which uses lenses to refract visible light that passed through a microtome, thinly sectioned sample to produce an observable image. Other major types of microscopes are the fluorescence micro ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Keratin
Keratin () is one of a family of structural fibrous proteins also known as ''scleroproteins''. It is the key structural material making up Scale (anatomy), scales, hair, Nail (anatomy), nails, feathers, horn (anatomy), horns, claws, Hoof, hooves, and the outer layer of skin in vertebrates. Keratin also protects epithelial cells from damage or stress. Keratin is extremely insoluble in water and organic solvents. Keratin monomers assemble into bundles to form intermediate filaments, which are tough and form strong mineralization (biology), unmineralized epidermal appendages found in reptiles, birds, amphibians, and mammals. Excessive keratinization participate in fortification of certain tissues such as in horns of cattle and rhinos, and armadillos' osteoderm. The only other biology, biological matter known to approximate the toughness of keratinized tissue is chitin. Keratin comes in two types: the primitive, softer forms found in all vertebrates and the harder, derived forms fou ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Trichorrhexis Nodosa
Trichorrhexis nodosa is a defect in the hair shaft characterized by thickening or weak points (nodes) that cause the hair to break off easily.Freedberg, et al. (2003). ''Fitzpatrick's Dermatology in General Medicine''. (6th ed.). McGraw-Hill. . This group of conditions contributes to the appearance of hair loss, lack of growth, and damaged-looking hair. Symptoms Among the symptoms (and signs) for this condition are the following: * lack of apparent hair growth * hair appears patchy * hair breaks easily close to scalp * hair may have thickenings or nodes in the shaft * ends of hair thinned or split * whitish discoloration of hair tips * hair breaks easily at tips Complications This condition is not dangerous but may affect self-esteem. Causes Trichorrhexis may have a genetic basis but appears to be precipitated by environmental factors. Among Caucasians the defect often appears at the ends of the hair shaft with splitting of the ends, thinning and whitish discoloration. These con ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Trichoptilosis
Trichoptilosis (from the Greek τριχο- ''tricho-'' "hair" and the New Latin ''ptilosis'' "arrangement of feathers in definite areas" from the Greek πτίλον "feather"), schizotrichia, and informally split ends, is the splitting or fraying of the hair-shaft due to excessive heat and mechanical stress.This condition occurs when the outer layer of the hair is damaged and the hair fibre divide into two or more strands. Types of Split ends Double split The most common type of split ends, where the single hair forks into two. Feather split In this type of split ends, the hair appears feathered at the end, with multiple splits splaying out. Tree split In this type, the ends branch out multiple times, resembling branches of a tree. Knot split The hair has a bulb at the end, becoming thicker at the tip. Causes Thermal, chemical or mechanical stress can cause split ends. For example, the use of curling irons and other heat treatments may cause split ends. Excessive appli ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Human Hair
Hair is a protein filament that grows from follicles found in the dermis. Hair is one of the defining characteristics of mammals. The human body, apart from areas of glabrous skin, is covered in follicles which produce thick terminal and fine vellus hair. Most common interest in hair is focused on hair growth, hair types, and hair care, but hair is also an important biomaterial primarily composed of protein, notably alpha-keratin. Attitudes towards different forms of hair, such as hairstyles and hair removal, vary widely across different cultures and historical periods, but it is often used to indicate a person's personal beliefs or social position, such as their age, gender, or religion. Overview Meaning The word "hair" usually refers to two distinct structures: #the part beneath the skin, called the hair follicle, or, when pulled from the skin, the bulb or root. This organ is located in the dermis and maintains stem cells, which not only re-grow the hair after it f ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hair Diseases
Hair diseases are illnesses that impact the persistence and regular growth of hair. Types of hair diseases include folliculitis, hirsutism, hypertrichosis, hypotrichosis (alopecia), Menkes kinky hair syndrome, monilethrix, and piedra. Folliculitis Folliculitis is an inflammatory response that occurs in the hair follicle's superficial part and may affect either the perifollicular or follicular opening. Hirsutism Hirsutism is characterized as the overgrowth of terminal hair in a typical male pattern distribution on a female's face and body. Hypertrichosis Hypertrichosis is any place of the body where there is more hair growth than is typically seen in people of the same age, race, and sex, excluding androgen-induced hair growth. Hypotrichosis Hypotrichosis is an uncommon condition where there is little to no hair development on the head, in the places of the body where hair normally grows, such as the brows above the eyes and the edges of the eyelids. Menkes kin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
