In primary science, topics such as matter, air, water, and changes of state are generally introduced through hands-on activities using everyday resources. Many children find it difficult to understand basic science concepts such as states of matter (solids, liquids, and gases) and everyday phenomena such as evaporating and dissolving. Teachers may…

Physicists have known for some time that pendulum motion is a useful analogy for other physical processes. Chemists have played with the idea from time to time but the strength of the analogy between pendulum motion and chemical processes has only received prominent published recognition since about 1980, although there are details of the analogy…

Fragile X mental retardation is a disease caused by the loss of function of a single RNA-binding protein, FMRP. Identifying the RNA targets recognized by FMRP is likely to reveal much about its functions in controlling some aspects of memory and behavior. Recent evidence suggests that one of the predominant RNA motifs recognized by the FMRP…

Redgram (Cajanus cajan L.) extracts have been analyzed for the protease inhibitors using a new, sensitive, simple, and rapid method for detection of electrophoretically separated protease inhibitors. The detection involves equilibrating the gel successively in the protease assay buffer and protease solution, rinsing the gel in assay buffer, and…

The use of biocatalysis and biotransformations are important tools in green chemistry. The enantioselective reduction of a ketone by crude plant parts, using carrot ("Daucus carota") as the reducing agent is presented. The experiment introduces an example of a green chemistry procedure that can be tailored to fit in a regular laboratory session.…

The selective syntheses of the cyclic monoterpenoids alpha-terpineol or alpha-cyclogeraniol from the acyclic monoterpenoid nerol using p-toluenesulfonic acid or chlorosulfonic acid as cyclizing agents, respectively, are described. The different behavior of nerol under diverse experimental conditions such as nature of the acid agents, solvents, and…

Dipyrromethanes (or dipyrrilmethanes) are important building blocks for many of the structures of interest in the areas of porphyrins, materials science, optics, and medicine. A variety of conditions have been established for the synthesis of dipyrromethanes of diverse structures, from substituted pyrroles to unsubstituted pyrrole and carbonyl…

For 137 years Markovnikov's rule has been extensively used in organic chemical education and research to describe the regioselectivity in electrophilic addition reactions to alkenes and alkynes. When the structures of the final reaction products are used as reference, the rule requests that certain polar addition reactions be termed…

The quantity of information available on Co(III)-pentaammine complexes to the undergraduate students is based on their dissociatively activated substitution processes. The advanced undergraduate set of experiments is presented that fill an important gap in the understanding of the differences taking place in the substitution mechanisms operating…

This study investigates how high school students respond to an environment of authentic science inquiry while participating in an intensive summer institute, the Waksman Student Scholars Programme at Rutgers University. We examined how students apprenticed with expert scientists in a study of contemporary questions in molecular genetics. Students…

This paper reports on a student summer project performed in 2006 at the University of Frankfurt. It is addressed to undergraduate students familiar with the basic principles of relativistic quantum mechanics and general relativity. The aim of the project was to study the Dirac equation in curved spacetime. To obtain the general relativistic Dirac…

The chemistry version of the Colorado Learning Attitudes about Science Survey (CLASS-Chem) is a new instrument designed to measure students' (novices') beliefs about chemistry and learning chemistry compared to those of experts (instructors). This survey is intended to measure the effects of students' beliefs on learning, and to understand how…

Describes how to construct a model of a DNA molecule with inexpensive materials. (BR)