Chemical (covalent) attachment of the enzyme to a supporting material. 2. ... Crosslinking of enzyme molecules The immobilised enzyme beads are added into a reaction tank and are recovered later by sedimentation or they are set up in a reactor column so that liquid flows continuously past the beads. ... Another area is in the immobilisation of whole cells (picture above), both for analytical biochemistry and also possibly disease therapy. ...

• Word Count: 519
• Approx Pages: 2
• Grade Level: High School

In chemical reactions, atoms are combined, separated, or rearranged. Daltons atomic theory explains that the Law of Conservation of Mass is due to chemical reactions involving just the combination, separation, or rearrangement of atoms while during the process they are not created nor destroyed. ... "Lavoisier heated mercury in the retort (pictured below) for several days until its whole surface was covered with red particles. ... In 1897 English physicist Joseph John Thomson carried out a series of experiments using a cathode-ray tube (pictured below). ... When the scientists checked for the...

• Word Count: 921
• Approx Pages: 4
• Grade Level: High School

This includes five basic principles; 1) all matter is made of indivisible and indestructible atoms, 2) atoms of a given element are identical in their physical and chemical properties, 3) atoms of different elements have different physical and chemical properties, 4) atoms of different elements combine in simple whole-number ratios to form chemical compounds, 5) atoms cannot be subdivided, created or destroyed when they are combined, separated, or rearranged in chemical reactions. ... In the result of this action a plot of equations provides a three dimensional picture of the electron cloud. ...

• Word Count: 937
• Approx Pages: 4
• Grade Level: High School

It is formed by the reaction that sunlight has on oxygen. ... Scientists discovered in the 1970's that chemicals that we had been using regularly were damaging the earth's protective layer. ... Chemicals such as bromine, nitrous oxide, which is found in fertilizers, have also been found to damage the ozone. ... Which is cold enough to create polar stratospheric clouds, in these clouds a reaction between the chemicals takes place and converts the inactive chlorine and bromine to more active forms. ... This satellite, which orbits the earth at about 600 km, measures ozone variations...

• Word Count: 1083
• Approx Pages: 4
• Grade Level: High School

Permanent madness is generally caused by chemical imbalances in the brain, or extreme conditions inflicted on the psyche. ... In the case of Poe's "The Fall of the House of Usher", the madness of Roderick Usher is likely a chemical imbalance called schizophrenia. The New Lexicon Webster's Dictionary, (pub.1991), cites that this is "a common mental disease whose characteristics may include separation of the intellect from the emotions, inappropriate emotional reactions, distortions in normal logical thought processes, withdrawal from social relationships, delusions, hallucinations, ...

• Word Count: 822
• Approx Pages: 3
• Grade Level: High School

A chemical reaction occurred as the plaster dried on the wall surfaces, which held the pigments to the surface. ... Its stage like setting recedes from a long table which is placed parallel to the picture plane. ...

• Word Count: 1021
• Approx Pages: 4
• Grade Level: High School