Discusses the ecological depletion of American deserts and current efforts to apply scientific knowledge in solving the problems of arid regions. (MLH)

Describes technological advances in the reclamation of deserts and arid lands, including control of silt, underground irrigation, desert aquaculture, and desert revegetation. (MLH)

Describes some recent advances in enzyme structure and action, including a description of enzyme-substrate interaction. Discusses the methods for determination of amino acid sequences in proteins; the actions of chymotrypsin, trypsin, and elastase; and details of the enzyme-substrate complex derived from kinetic studies and x-ray diffraction…

Summarizes nine papers given at the Fourth Biennial Conference on Chemical Education that dealt with increasing the relevance of chemistry courses. (MLH)

Summarizes 18 papers given at the Fourth Biennial Conference on Chemical Education that dealt with innovative instructional methods or theories, including instructional objectives, audiotape-slide programs, and criterion-referenced evaluation. (MLH)

Summarizes 12 papers presented at the Fourth Biennial Conference on Chemical Education that dealt with suggested modifications in the ideas and terminology taught in a variety of chemistry courses. (MLH)

Describes the use of various indicators to demonstrate chemical reactions; the display of sodium as a shiny metal; and the illustration of the attainment of chemical equilibrium with beakers of chemicals and an overhead projector. (MLH)

Describes a computerized experiment in which the student determines the pk of an acid-base indicator from absorption spectra of the indicator at various concentrations. (MLH)

Contains information regarding pollen and human allergies. Lists most common types of pollen, describes pollen morphology, diagrams and apparatus for collecting pollen, and suggests laboratory activities such as pollen counts, pollen concentration, dispersal, and meteorological effects. (CS)

Examines recent studies of the elimination-addition mechanism of acyl group transfer, in which an acid function moves from one acceptor to another. Presents diagnostic evidence for this mechanism and discusses acyl group transfers in metabolism. (MLH)

Presents two hydroboration-alkylation sequences, each requiring a three-hour laboratory period, that demonstrate the synthetic utility of the organoboranes. (MLH)

Describes a biochemistry experiment that illustrates the methodology of affinity chromatography by attaching avidin, a glycoprotein in egg white, to a Sepharose matrix in order to bind biotin-containing proteins. (MLH)

Describes the quantitative analysis of a gaseous mixture using peak heights and ratios between the peak heights. (MLH)

Some of the problems associated with setting up a computer simulation are examined. Uses of computer simulation as a teaching tool in the life sciences are detailed with some examples presented from courses at Sturt College of Advanced Education. (BT)

Discusses research on the structures of metalloproteins and the role of iron in biological transport systems. (MLH)