The Ultimate Curiosity

Thursday, 19 April 2012

Circulatory system

01:26 juilite

The circulatory system is an organ system that passes nutrients (such asamino acids, electrolytes and lymph), gases, hormones, blood cells, etc. to and from cells in the body to help fight diseases, stabilize body temperature and pH, and to maintain homeostasis.This system may be seen strictly as a...

Evolution Of Eye

03:38 juilite

Evolution of the eyePhotoreception is phylogenetically very old, with various theories of phylogenesis. The common origin (monophyly) of all animal eyes is now widely accepted as fact. This is based upon the shared anatomical and genetic features of all eyes; that is, all modern eyes, varied as they are, have their origins in a proto-eye believed to have evolved some 540 million...

Sinus tachycardia

01:15 juilite

Sinus tachycardia (also colloquially known as sinus tach or sinus tachy) is a heart rhythm with elevated rate of impulses originating from the sinoatrial node, defined as a rate greater than 100 beats/min in an average adult. The normal heart rate in the average adult ranges from 60–100 beats/min. Note that the normal heart rate varies with age,...

Ezetimibe

08:08 juilite

Ezetimibe is a drug that lowers cholesterol. It acts by decreasing cholesterol absorption in the intestine. It may be used alone (marketed as Zetia or Ezetrol), when other cholesterol-lowering medications are not tolerated, or together with statins (e.g., ezetimibe/simvastatin, marketed as Vytorin and Inegy) when statins...

Hypertriglyceridemia

08:00 juilite

In medicine, hypertriglyceridemia denotes high (hyper-) blood levels (-emia) oftriglycerides, the most abundant fatty molecule in most organisms. It has been associated with atherosclerosis, even in the absence of hypercholesterolemia (highcholesterol levels). It can also lead to pancreatitis in excessive concentrations...

Hideki Yukawa and the Pion

00:04 juilite

Once quantum electrodyamics had produced the picture of the electromagnetic force as a process of exchanging photons, the question of whether or not the other forces were also exchange forces was a natural one. In 1935, Hideki Yukawa reasoned that the electromagnetic force was infinite in range because the exchange particle was massless. He proposed that the short range strong...

Baryons

23:53 juilite

Baryons are massive particles which are made up of three quarks in the standard model. This class of particles includes the proton and neutron. Other baryons are the lambda, sigma, xi, and omega particles. Baryons are distinct from mesons in that mesons are composed of only two quarks. Baryons and mesons are included in the overall class known as hadrons, the particles which...

pion

23:44 juilite

ParticleSymbolAnti-particleMakeupRest massMeV/c2SCBLifetimeDecay ModesPionπ+π-ud139.60002.60x10-8μ+νμPionπ0Self135.00000.83x10-162γThe neutral pion decays to an electron, positron, and gamma ray by the electromagnetic interaction on a time scale of about 10-16 seconds. The positive and negative pions have longer lifetimes of about 2.6 x 10-8 s. The negative pion decays into...

Mesons

23:40 juilite

Mesons are intermediate mass particles which are made up of a quark-antiquark pair. Three quark combinations are called baryons. Mesons are bosons, while the baryons are fermions. Recent experimental evidence shows the existence of five-quark combinations which are being called pentaquar...

Microcephaly

23:14 juilite

Microcephaly is a neurodevelopmental disorder in which the circumference of the head is more than two standard deviations smaller than average for the person's age and sex. Microcephaly may be congenital or it may develop in the first few years of life. The disorder may stem from a wide variety of conditions that cause abnormal growth of the brain,...

The Mathematical Probability Of Life On Other Earth-Like Planets

13:04 juilite

Infinity was invented to account for the possibility that in a never-ending universe, anything can happen. Life on other Earth-like planets, for example, is possible in an infinite universe, but not probable, according to a scientist from the University of East Anglia. The mathematical model produced by Prof Andrew Watson suggests that the odds of finding new life on...

Muscle relaxant

12:24 juilite

A muscle relaxant is a drug which affects skeletal muscle function and decreases the muscle tone. It may be used to alleviate symptoms such as musclespasms, pain, and hyperreflexia. The term "muscle relaxant" is used to refer to two major therapeutic groups: neuromuscular blockers and spasmolytics. Neuromuscular blockers act by...