Melanocytes: Description and purpose
By: Valarie Juntunen
The cells in the skin that produce melanin are called melanocytes, which literally mean "melanin cells". Melanin is one mechanism that protects the body from the harmful effects of sunlight. Exposure to sunlight triggers the melanocytes which produce melanin, darkening the skin. Most people relate...
Plant profile: Great mullein
By: Rex Trulove
Great mullein (Verbascum thapsus) is a plant that most people have probably seen, and yet many of them may not have given the plant a second thought. In part, this may be because it is so common along roadsides and waste areas, especially those that...
Melanocytes: Description and purpose
By: Alicia M Prater PhD
Melanocytes are the pigment cells of the human body, determining the color of the hair and skin. These specialized cells are found in the basal (i.e. bottom) layer of the epidermis, where the hair roots start. Related cells are also found in the eye...
By: Allienne Becker
Microbes, also known as microorganisms are classified into different categories: Viruses, Bacteria, Algae, Fungi, Protozoa. To further differentiate between the microbes a taxonomic system is employed whereby taxa are defined by a strict set of rules. Classifications are obtained by observing and comparing individual species...
Melanocytes: Description and purpose
By: Jack Merrywell
Melanocytes are pigment-producing cells that rest in the bottom layer of the epidermis. They are responsible for the secretion of the pigment melanin, which is the main, dark-brown pigment in skin, eye, and hair tissue. The human epidermis contains in the order of 1,500...
By: Nancy Hayden
The Tasmanian wolf was no relation to wolves nor was it related to tigers as its other common name might suggest. Thylacinus cynocephalus, as it was scientifically known, was most closely related to the dasyuroid marsupials, which also includes the Tasmanian devil. Extinct since the...
Extinct animal profile: Tasmanian wolf
By: Lynn Robling
The Tasmanian Wolf or Tasmanian Tiger was an animal that once thrived in Australia, New Guinea, and Tasmania but is now extinct. Its true name is Thylacine. It was actually a marsupial; an animal which carries its young inside a pouch to help it complete...
By: Amelia Emery
A chromosome is basically a specific strand of DNA (deoxyribonucleic acid) that is tightly coiled up into into an individual package rather than the long strand form that it is usually found as. Chromosomes are found in the nucleus of a cell and are only...
By: Blaise Pascal
Microbes, otherwise known as microorganisms, are a broad grouping of single or multi-celled organisms which are too small to see with the naked eye. There are approximately 1.7 million known microorganisms and it is estimated that there are millions more that people have yet...
By: Nick Ford
Protozoa are a difficult to define group of single celled organisms, They fall within the general classification of protists. The protists are believed to be the early ancestors of the multicellar plant and animal kingdoms. The protists are single celled organisms that contain a nucleus...

 

1 317 318 319 320 321 371