A lock of what some historians think is Leonardo da Vinci's hair went on display Thursday at a museum in his Tuscan birthplace as they seek to prove it contains his DNA 500 years after the genius died.
Other
May 02, 2019
0
3
University of Copenhagen researchers have developed a nanocomponent that emits light particles carrying quantum information. Less than one-tenth the width of a human hair, the miniscule component makes it possible to scale ...
Optics & Photonics
Apr 24, 2019
1
132
A secluded mountain region thought to be free of plastic pollution is in fact blanketed by airborne microplastics on a scale comparable to a major city such as Paris, alarmed researchers reported Monday.
Earth Sciences
Apr 15, 2019
3
1673
Cyanobacteria are tiny, hardy organisms. Each cell is 25 times smaller than a human hair, but don't let the size fool you. Their collective ability to do expand photosynthesis is why we have air to breathe and a diverse ...
Biochemistry
Apr 04, 2019
0
4
For decades, forensic scientists have tested strands of hair to reveal drug use or poisoning. But in recent years, reports have questioned the technique—in particular, its ability to distinguish between the intake of a ...
Analytical Chemistry
Mar 27, 2019
0
5
Researchers at the University of Sydney, Swinburne University of Technology and the Australian National University have collaborated to develop a solar absorbing, ultrathin film with unique properties that has great potential ...
Optics & Photonics
Mar 19, 2019
0
204
Whether you need a disguise to run from the law or are just trying to emulate *NSYNC-era frosted tips, you may need some chemical assistance to put the hue in your do.
Other
Mar 01, 2019
0
3
Scientists of the Far Eastern Federal University (FEFU), working as part of an international toxicologists' team, studied fur samples of wild terrestrial mammals in Primorye, Russia. All samples contained persistent organic ...
Environment
Feb 14, 2019
0
12
When you hear about businesses with a high environmental impact or activities with a high carbon footprint, you are probably more likely to imagine heavy machinery, engines and oil rather than hairdressing. Yet hairdressing, ...
Environment
Feb 11, 2019
0
8
Hunting spiders easily climb vertical surfaces or move upside down on the ceiling. A thousand tiny hairs at the ends of their legs make sure they do not fall off. Like the spider's exoskeleton, these bristle-like hairs (so-called ...
Analytical Chemistry
Feb 11, 2019
0
4
Hair is a protein filament that grows through the epidermis from follicles deep within the dermis. The fine, soft hair found on many nonhuman mammals is typically called fur; wool is the characteristically curly hair found on sheep and goats. Found exclusively in mammals, hair is one of the defining characteristics of the mammalian class. Although other non-mammals, especially insects, show filamentous outgrowths, these are not considered "hair" in the scientific sense. So-called "hairs" (trichomes) are also found on plants. The projections on arthropods such as insects and spiders are actually insect bristles, composed of a polysaccharide called chitin. There are varieties of cats, dogs, and mice bred to have little or no visible fur. In some species, hair is absent at certain stages of life. The main component of hair fiber is keratin.
The hair can be divided into three parts length-wise, (1) the bulb, a swelling at the base which originates from the dermis, (2) the root, which is the hair lying beneath the skin surface, and (3) the shaft, which is the hair above the skin surface. In cross-section, there are also three parts, (1) the medulla, an area in the core which contains loose cells and airspaces (2) the cortex, which contains densely packed keratin and (3) the cuticle, which is a single layer of cells arranged like roof shingles.
This text uses material from Wikipedia, licensed under CC BY-SA
