Prague zoo's month-old Sumatran orangutan finally has a name
He's called Pustakawan, or Kawi, if you wish.
He's called Pustakawan, or Kawi, if you wish.
Plants & Animals
Dec 16, 2020
0
5
All plant cells can be made to react by touch or injury. The carnivorous Venus flytrap (Dionaea muscipula) has highly sensitive organs for this purpose: sensory hairs that register even the weakest mechanical stimuli, amplify ...
Plants & Animals
Dec 11, 2020
0
154
General relativity is a profoundly complex mathematical theory, but its description of black holes is amazingly simple. A stable black hole can be described by just three properties: its mass, its electric charge and its ...
Astronomy
Dec 11, 2020
52
171
In crime scene investigations, a single strand of hair can make a huge difference in the evolution of a case or trial. In most cases, forensic scientists must look for clues hidden in minuscule amounts of substances or materials ...
Analytical Chemistry
Dec 09, 2020
0
7
Using an imitation "ear" modeled on the organs that mosquitos use to hear, researchers have identified a mosquito's species and sex using sound—just like mosquitos do themselves.
General Physics
Dec 07, 2020
0
8
ITMO University's bioinformatics researchers have developed an algorithm that helps to assess the influence of genes on processes in the human body, including the development of disease. The research was published in BMC ...
Cell & Microbiology
Nov 30, 2020
0
108
The use of face masks to help slow the spread of COVID-19 has been widely recommended by health professionals. This has triggered studies exploring the physics of face mask use and disease transmission, as well as investigations ...
Soft Matter
Nov 24, 2020
2
1188
A team of paleontologists described two amber pieces found in sites in Teruel (Spain) with remains from vertebrates corresponding to the Early Cretaceous. Both pieces have their origins in the same conservation process of ...
Archaeology
Nov 19, 2020
0
94
A team at Aalto University has used bacteria to produce intricately designed three-dimensional objects made of nanocellulose. With their technique, the researchers are able to guide the growth of bacterial colonies through ...
Bio & Medicine
Nov 10, 2020
0
172
We've long been warned of the risks of dyeing hair at home and in salons. Products used can cause allergies and skin irritation—an estimated 1% of people have an allergy to dye. Furthermore, repeated use of some dyes has ...
Materials Science
Oct 30, 2020
0
85
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