A laboratory experiment is described in which students carry out immobilization of the enzyme invertase via entrapment in alginate (Ca-alginate) and, accordingly, estimate values for kinetic constants and mass transfer coefficients. Immobilization of enzymes, or confinement thereof to a defined space with retention of most catalytic activity, is…

Polymers are ubiquitous and essential to modern society, which is why the American Chemical Society has mandated inclusion of polymer chemistry in the undergraduate curriculum. To meet this requirement, we have chosen to weave a polymeric theme through multiple laboratory courses beginning with organic chemistry, where students use aspartic acid…

A eutectic system is a mixture of two or more substances, displaying a melting temperature lower than its standalone components. The eutectic composition displays the lowest melting temperature of all mixtures. Typically, a eutectic system is used as an example of binary phase diagrams to demonstrate to undergraduate students. Herein, the liquidus…

The research described here examined the sources of knowledge of astronomy of children (age 3-18) in China and New Zealand, together with the development of their awareness of competing sources, ranging from everyday language, childhood literature and folklore to the scientific accounts prevalent in schools. The authors cite examples of the…

Watching over a coffee maker in operation, and designing a simple experiment using it, invokes familiar and unfamiliar physical phenomena and techniques involving calorimetry and heat transfer.

Picture books are among the primary resources that could be referred to for introducing scientific concepts to young children. However, it is known that misrepresentations in picture books could lead to misconceptions in children and make it more difficult to acquire scientific concepts. This study investigates the misrepresentation of scientific…

Entropy is a concept with an extreme controversy which many scientists have been trying to explain. Some of the approaches employed in its definition contradict each other, which made it extremely difficult for high school and college students to understand. Boltzmann was the first person who brought a statistical explanation to entropy and…

Science and environmental educators implicitly presuppose that the ecosystem per se is clearly defined and consider learners' misunderstandings to be incorrect scientific interpretations of uncontested knowledge content. The present study, however, explores how in-service secondary education Greek biology teachers address the topic of 'ecosystem…

By means of their pivotal role in the outbreak of a variety of diseases, such as, recently, COVID-19, the molecular aspects of cell membrane function have gained considerable attention from researchers in recent decades. The resulting information explosion and the growing interdisciplinary character of cell biology seems, however, to not be…

Suzuki-Miyaura coupling reactions are well-known among the most versatile catalytic C-C bond formation reactions. Two different routes of C-C bond Suzuki-Miyaura coupling reactions for the undergraduate organic chemistry laboratory courses have been designed and explained. A two-step reaction involving a catalyst preparation as the first step and…

We report a research-enhanced undergraduate laboratory practical in which students synthesize and characterize color-controllable, stable silver nanoparticles for use in a simple catalytic reaction analyzed by UV-vis spectroscopy. The practical has been prepared for students using electronic laboratory notebooks, enables collaborative data…

Publicly available, learner-generated questions were used to develop a methodology for advancing the exploratory stages of science education research. Data from four complementary online sources were collected, analyzed, and compared to the extant research literature on the science education topic of isotopes, a challenging concept for many…

On November 16, 2018, at the 26th meeting of the General Conference on Weights and Measures (CGPM), a resolution was adopted that introduced historical changes into the International System of Units (SI). This decision, effective from May 20, 2019, established that the SI units of measurement will be defined by means of a set of seven fixed…

A bouncing rubber ball under a motion sensor is a classic of introductory physics labs. It is often used to measure the acceleration due to gravity, and can also demonstrate conservation of energy. By observing that the ball rises to a lower height upon each bounce, posing the question "What is the main source of energy loss?" and…

In this work, an adaptation is developed of the first observation attempted by Galileo to demonstrate the heliocentric hypothesis to be correct. The objective is to enable students in their final year of elementary school to confront by themselves the same contradictory evidence that Galileo confronted during the second decade of the 17th century.…