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Chemistry Tutorial by University of Arizona Review the basics of chemistry you'll need to know to study biology. Large Molecules by University of Arizona Learn about structures and properties of sugars, lipids, amino acids, and nucleotides, as well as macromolecules including proteins, nucleic acids and polysaccharides. Clinical Correlates of pH Levels by University of Arizona Learn how metabolic acidosis or alkalosis can arise and how these conditions shift the bicarbonate equilibrium. The body's compensatory mechanisms and treatment options are also discussed. Energy, Enzymes, and Catalysis by University of Arizona Familiarize yourself with some key principles about enzymes, catalysis, and energy that are central to a subsequent study of metabolic pathways. Metabolism by University of Arizona Develop a basic understanding of some of the fundamental concepts of metabolism. Carbohydrate Metabolism Regulation by University of Arizona Learn about the regulation of carbohydrate metabolism by insulin, glucagon and epinephrine, mainly in liver and muscle.
Gustav Kirchhoff left and Robert Bunsen right Analytical chemistry has been important since the early days of chemistry, providing methods for determining which elements and chemicals are present in the object in question. During this period significant contributions to analytical chemistry include the development of systematic elemental analysis by Justus von Liebig and systematized organic analysis based on the specific reactions of functional groups. The first instrumental analysis was flame emissive spectrometry developed by Robert Bunsen and Gustav Kirchhoff who discovered rubidium Rb and caesium Cs in During this period instrumental analysis becomes progressively dominant in the field. In particular many of the basic spectroscopic and spectrometric techniques were discovered in the early 20th century and refined in the late 20th century.
One of these was Henri Becquerel , who investigated the relationship between phosphorescence and the blackening of photographic plates. When Becquerel working in France discovered that, with no external source of energy, the uranium generated rays which could blacken or fog the photographic plate, radioactivity was discovered. Marie Curie working in Paris and her husband Pierre Curie isolated two new radioactive elements from uranium ore. They used radiometric methods to identify which stream the radioactivity was in after each chemical separation; they separated the uranium ore into each of the different chemical elements that were known at the time, and measured the radioactivity of each fraction. They then attempted to separate these radioactive fractions further, to isolate a smaller fraction with a higher specific activity radioactivity divided by mass.