Recommendations are made for handling and growth of Beneckea natriegens, a rapidly growing, nonpathogenic marine bacterium which can be used with advantage to replace Escherichia coli in many undergraduate microbiology experiments. Examples of experiments and the potential value of this organism as a subject for student research projects are…

Derives Green's functions and integral equations for scattering solutions subject to a variety of boundary conditions. Exact solutions are obtained for the case of a finite spherical square-well potential, and properties of these solutions are discussed. (Author/HM)

Several standard arguments which attempt to show that the wave function and its derivative must be continuous across jump discontinuities of the potential are reviewed and their defects discussed. (Author/HM)

Provides criteria for elementary teachers for selecting materials for metric education. Some teaching aids and equipment lists are suggested that can be helpful to the classroom teacher. (SA)

Accidentally killed animals provide biology classes with excellent study material. (Editor)

Shows how the quantization of a Hamiltonian which is not canonically related to the energy is ambiguous and thereby results in conflicting physical interpretations. Concludes that only the Hamiltonian corresponding to the total energy of a classical system or one canonically related to it is suitable for consistent quantization. (GA)

Presents an exact solution to the nonlinear Faraday's law problem of a rod sliding on frictionless rails with resistance. Compares the results with perturbation calculations based on the methods of Poisson and Pincare and of Kryloff and Bogoliuboff. (Author/GA)

Examines the periodical "Scienceland," a Panasonic light scope, and an astronomy light for quality, accuracy, and usefulness in the classroom. (MA)

Discusses new techniques for studying reactions that occur in the picosecond range and how the results of this research provide new insights into biochemical events and the chemical processes that take place in liquid systems. (MLH)

Discusses recent progress in using tunable lasers to selectively separate substances at the atomic and molecular level. Emphasizes biological applications, such as selective excitation and breaking of hydrogen bonds in DNA. (MLH)

Discusses new laser techniques that make it possible to see optical spectra without Doppler broadening, to label energy levels, and to enhance sensitivity. (MLH)

Discusses the nomenclature of inorganic oxo acids in which the central atom is bonded to one or more organic residues; also considered are their salts and esters. (MLH)

Identifies four strategies to help students understand how their textbooks are organized and allow them to access the information rapidly and more efficiently. Includes details of the survey technique, the hierarchical summary, the patterns guide, and the structured overview approach. (DDR)

Investigates the extent to which analogies in instructional science books are provided by authors. Eighty texts available from commercial publishers and intended for use in the elementary school classroom were analyzed. It was found that most of the books did not offer many analogies and fewer than those for older students. (Contains 49…

Offers a library resource exercise developed as a collaborative effort between the geology department and the library staff to introduce students to library usage and geological literature. Students can be expected to use these library skills to conduct subsequent subject-area research. Benefits include the ability to address large numbers of…