Effect of Ascending an Ordinary Flight of Stairs on the Work of the Heart Observations on Normal Individuals and on Patients withCoronary Heart Disease By JAMESA. L. MATHERS,M.D.,HAROLD I. GRIFFEATH,M.D.,ROBERTL.LEVY,M.D., AND JOHNL. NICKERSON,PH.D.he blood pressure cuff andelectrocardiograplhic electrodes remained on the ex-tremities during the exercise to facilitate the speedof making the observations during the recovery period. All obstructions, such as closed doors andotherpersons, wereremoved fromthe path ofthesub-ject being tested.
Restriction enzymes, also known as restriction endonucleases, are enzymes that cut a DNA molecule at a particular place. They are essential tools for recombinant DNA technology. The enzyme scans a DNA molecule, looking for a particular sequence, usually of four to six nucleotides. Once it finds this recognition sequence, it stops and cuts the strands. This is known as enzyme digestion. On double stranded DNA the recognition sequence is on both strands, but runs in opposite directions.
Chemical digestion. The most important function of physical digestion is to increase the surface area of the food you eat. This makes it easier for enzymes to act on the large insoluble food molecules and break them down into small soluble ones.An enzyme is a protein molecule.Each type of enzyme catalyses a particular reaction or type of reaction.nzymes in the digestive system speed up the breakdown of the food. Enzymes are made in many places along the digestive system. 1  Carbohydrases-enzymes which break down carbohydrates into simple sugars. 2  Proteases-enzymes which break down proteins, ending up with amino acids.