Stas-Otto method A method of extraction of alkaloids from plants and animal bodies: the substance is digested in alcohol and tartaric acid, the fatty and resinous matters are precipitated with water, the fluid is made alkaline, and the alkaloids are extracted with ether or chloroform...
A sensory system is a part of the nervous system consisting of sensory receptors that receive stimuli from the internal ..
Earth was created around 4.5 billion years ago and life began not long after. Primitive life likely possessed the elemen..
Geological periods is a study guide that cites the different geological periods on Earth's timeline. Each has a brief ov..
Hormones are produced in the endocrine glands of animals. The pituitary gland and hypothalamus are the most impor..
The nervous system is essentially a biological information highway. This tutorial gives an overview of the nervous syste..
Meet some of New Zealand's unique fauna, including endemic insects, frogs, reptiles, birds, and mammals, and investigate..
