Experimental procedures are provided for the quantitative determination of Vitamin A (retinol) in food products by analytical liquid chromatography. Standard addition and calibration curve extraction methods are outlined. (SK)

Materials and methods are presented illustrating a modification of the Nakai/Glinsmann technique for comparing apparent formation constants for ADP-Mg and ADP-polyamine complexes. (Author/SK)

Describes experiment expanding on principles behind measuring efficiency of chromatographic columns and allowing calculation of parameters in the van Deemter equation. Easily accomplished in a three-hour period using a gas chromatograph in which gas flow can be changed and measured. Mathematical solutions can be attained with programmable…

An experiment using gas-liquid chromatography is discussed, introducing the student to concept of dead volume and its measurement, idea and use of an internal reference compound, and to linear relationship existing between measurements of a separation on two different stationary phases. (Author/SK)

The use of a logarithmic amplifier preceding an oscilloscope's vertical amplifier is described for physics teachers who want to demonstrate the exponential decay nature of some phenomena. (Author/SA)

Intended for the elementary teacher who lacks science teaching experience, this article presents tips for finding background information and for stocking a portable "science lab" with everyday materials. It also outlines 10 easy experiments. (SJL)

Compares and contrasts effects of two spectroscopic techniques on bromine and iodine vapor. (CS)

Presents two experimental set-ups. The first demonstrates the law of Malus using a pair of Polaroid polarizers and a monochromatic light source with an interference filter. The second describes a modification of Hilton's apparatus to demonstrate the effects of the magnetic hysteresis on an overhead projector. (CS)

Presents nine physics notes for British secondary school teachers. Some of these notes are: (1) speed of sound in a steel rod; (2) physics extracts-part four (1978); and (3) a graphical approach to acceleration. (HM)

Describes some undergraduate laboratory experiments in acoustics which involve the analysis of speech and musical instrument sounds and the general analysis of the frequency range of complex sounds. (HM)

Describes an applied physics course which has been taught at Liverpool Polytechnic in the United Kingdom. Objectives, experimental work and assessment of the course are included. (HM)

Describes an experiment with Orange II to illustrate a central idea of thermodynamics--the amount of work that must be done to bring about a particular transformation depends not only on the energy content of the initial and final states but also on the degrees of dispersion of those states. (CS)

Describes a general chemistry experiment involving gas law calculations, utilizing Alka Seltzer as a source of carbon dioxide. (CS)

Reports procedures for a college experiment in radioisotope chemistry that involves ion-exchange of 51-Cr. (CS)

Describes an undergraduate laboratory experiment that demonstrates the value of shift reagent use in producing a first-order spectrum of trans-retinol. (CS)