A single, didactic criterion for the description of all biological macromolecules is proposed. This criterion is applicable to globular, fibrous or mixed proteins, as well as to nucleic acids and lipids or polysaccharides. Specific examples are given for all except lipids and polysaccarides. (KR)

A molecular approach for introducing entropy in undergraduate physical chemistry course and incorporating the features of Davies' treatment that meets the needs of the students but ignores the complexities of statistics and upgrades the qualitative, intuitive approach of Lambert for general chemistry to a semiquantitative treatment using Boltzmann…

The computer systems available for molecular modeling are described, along with a discussion of a molecular modeling program created and supported by computational techniques for the first-semester general chemistry course. Various exercises are listed, which direct the learner from a beginner's course in software practice to more complex…

A scanning tunneling microscope (STM) project designed as a module for the undergraduate physical chemistry laboratory is described. The effects of van der Waals interactions on the condensed-phase structure are examined by the analysis of the pattern of the monolayer structures.

The PC-based software technology, a computational-modeling course, for undergraduate chemistry students helps them to understand the molecular modeling in a better way. This course would be able to accommodate a wider array of topics and a greater depth of theory as the modeling is increasingly incorporated into the chemistry curriculum.

Since the identification of the FMR1 gene basic research has been focused on the molecular characterization of the FMR1 gene product, the fragile X mental retardation protein (FMRP). Recent developments in fragile X research have provided new insights and knowledge about the physiological function of FMRP in the cell and the nerve cell in…

Nanotechnology deals with machines, materials, and structures and their behaviors at the scale of atoms and molecules, or the nanoscale. By working on this scale, scientists are able to create enhanced materials with desirable properties, such as stain-resistance. The authors developed the activity described in this article to introduce middle…

The origins of the pion exchange model of nuclear forces are described and the exchange process is reinterpreted in the light of current views on the quark-gluon structure of nucleons. It is suggested that the reinterpretation might provide a picture of cohesive nuclear forces that is more intellectually satisfying than that produced by the…

Presents the spectra of the flames of three gaseous mixtures, together with analyses of the rotational, vibrational, and electronic contributions to the spectra. (MLH)

Describes an experiment in which the beam of X-rays is simulated through the use of a laser as a monochromatic light source and the crystal is replaced by photographically prepared masks. A strong diffraction pattern as large as 20 cm. can be obtained. (GS)

Describes exercises using simple ball and stick models which students with no chemistry background can solve in the context of the original discovery. Examples include the tartaric acid and benzene problems. (GS)

Chemical bonding, for most simple complexes, is described in the Mulliken-Walsh Molecular Orbital (MO) theory. (CP)