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Posted by bio_man   February 20, 2019   903 views

There are two measurement systems used in the world today: the imperial system (also known as the English system) and the metric system.

The imperial system was developed in England hundreds of years ago and was brought to the the United States by the colonists. The metric system is the accepted measurement system used in most countries of the world. It is a system based on multiples of 10. The metric system was developed in France around 1790 and has been revised several times. Its official name today is the International System of Units or SI Units for short.

Both systems have come a long way since their conception. Here are some noteworthy facts about both, which may have been "lost" in history, but are still worth mentioning today.

Base u [ ... ]

Measurement English System Metric System Calendar Fahrenheit Factoids
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Posted by bio_man   February 19, 2019   855 views

1)  Roman Numeral IV

Although the Roman numeral for the number 4 has always been taught to have been "IV," according to historians, the ancient Romans probably used "IIII" most of the time. This is partially backed up by the fact that early grandfather clocks displayed IIII for the number 4 instead of IV. Early clockmakers apparently thought that the IIII balanced out the VIII (used for the number 8) on the clock face and that it just looked better.

2)  Base 60

The Babylonians wrote numbers in a system that used 60 as the base value rather than the number 10. They did not have a symbol for "zero."

3)  Fraction Bar

The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole. It wasn't until later in h [ ... ]

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Posted by bio_man   January 8, 2019   1975 views
The Mexican tetra (Astyanax mexicanus) is a blind, freshwater cave fish native to central and eastern parts of Mexico. Growing to a maximum total length of 12 cm (4.7 in), this species is notable for having no eyes or pigment; it has a pinkish-white color to its body (resembling an albino).

The Mexican tetra spends most of its time in midlevel water above the rocky and sandy bottoms of pools and backwaters of creeks and rivers of its native environment. Coming from a subtropical climate, it prefers water with 6.5–8 pH and a temperature range of 20 to 25 °C (68 to 77 °F). In the winter, some populations migrates to warmer waters. Its natural diet consists of crustaceans, insects, and annelids.

Given their peaceful nature, this species is popu [ ... ]

Fish Mexico Blind Fish
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Posted by bio_man   January 2, 2019   1555 views
Genes that help control inflammation leads to longer lifespans for humans and other species, and more of these genes a species has, the longer it can live.

Genes encoding some inflammation-dampening molecules are more numerous in longer-lived species, such as humans, than in short-lived animals such as mice. The genes produce proteins known as CD33-related Siglecs. Siglecs are proteins that recognize different versions of sialic acid – sugars that are found at all cell surfaces of vertebrates and some invertebrates.

By distinguishing between different versions of sialic acid, the proteins help the immune system decide which cells are normal residents of the body and which are intruders. In addition, the proteins soothe inflammation in the aft [ ... ]

longevity sialic acid inflammation
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Posted by bio_man   January 2, 2019   1548 views

Teenagers are known for making impulsive choices and decisions. Studies of the adult brain show that risk-taking among teenagers can be narrowed down to the "feel-good" hormone dopamine. Dopamine is a neurotransmitter that helps control the brain's reward and pleasure centers, as well as helping to regulate movement and emotional responses, see rewards and take action to move toward them.

When it comes to adolescents, neurons sensitive to dopamine are activated less when looking at the prospect of a reward compared to adults. Tests conducted on rats show that adult rats appear to obtain a small dopamine rush from simply anticipating a reward, while adolescent rats do not exhibit the same level of dopamine-based satisfaction. In terms of hum [ ... ]

Dopamine Teenagers Behavior Risk and Reward Rats Study
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Posted on Mar 1, 2019 by cloveb
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