An experiment to perform a simple initial investigation that illustrates concepts of speciation and equilibrium, using the instrument and chemical resources in the laboratory is presented. The investigation showed that the presence of multiple chemical species in a reaction mixture (phenol red solution) reflects the acid and base conditions…

Discusses the work of Lecoq de Boisbaudran, who established the identity of gallium in 1875 by applying his knowledge of spectroscopy to the elucidation of atomic weights and atomic properties. (MLH)

Examines the early photochemical and photographic research of French, German and English natural philosophers. Describes how these investigators developed photography and the laws which govern photochemical reactions. (MLH)

Describes a lecture series at the University of Delaware in which faculty members from various universities impersonate early American scientists while they deliver lectures and recreate historic experiments. (MLH)

Describes a biochemical concept called Mitchell's chemiosmotic hypothesis, which proposes a system that catalyzes the hydrolysis of ATP to ADP and inorganic phosphate. The system is reversible and causes a translocation of protons across a physiological membrane. (MLH)

Summarizes the various activities of the conference and presents abstracts of the symposia and contributed papers. (GS)

Discusses the development of the periodic table of the elements, in particular, the idea that the elements could be ordered according to atomic number. (BB)

The solvent and chemical properties of liquid ammonia are presented. In a certain sense, ammonia is a more versatile solvent than is water because of its ability to solubilize, without reaction, highly negative or reducing species. (Author/BB)

Research in carbonate geology over the last year continued many trends prevalent the year before, not the least of which has been the study of modern carbonate platform margins. (Author/BB)

Techniques in geochemistry continue to improve in sensitivity and scope. The exciting areas of geochemistry still include the classical fields of the origin of the elements and objects in space, but environmental crisis problems are important as well. (Author/BB)

Reviews the areas of laser chemistry, photochemistry, infrared lasers, and laser induced molecular reactions. (SL)

Reports on a recent study of the role of chemistry in medicine, particularly in drug research and development. Includes eight major recommendations which come from the study. (CP)

Describes a satisfactory junction that can be easily fabricated. Discusses the specifications and applications of the junction. States that this junction is especially useful for microcells. (CW)