The Scientist's Playground

Order in the playground

In eukaryotes the arrangement of genes along the chromosome is not as random as it at first appeared, and distinctive clusters of functionally related but non-homologous genes can be found in the genomes of certain animals and fungi. These include the major histocompatibility complex in mammals and gene clusters for nutrient use and secondary metabolite production in fungi. A growing number of ...

By the scientists, for the scientists

My association with the JCB began very early in my scientific career. In fact, it predated my understanding that there would even be a scientific career. In the mid-1970s while still an undergraduate, the JCB published my very first paper, a contribution noted perhaps less so for its reporting the characterization of the first known protein in plant cell walls than for a footnote that called at...

Severity of playground-related fractures: more than just playground factors?

INTRODUCTION Despite the establishment of playground safety standards, playground-related injuries are still a significant cause of extremity fractures in Singapore. This prospective study evaluates the dimensions and characteristics of our playgrounds, and their effect on fracture severity in an Asian population. We aim to correlate various playground risk factors with severity of the fracture...

Pumping a playground swing.

In mechanical studies of pumping a playground swing, two methods of energy insertion have been identified: parametric pumping and driven oscillation. While parametric pumping involves the systematic raising and lowering of the swinger's center of mass (CM) along the swing's radial axis (rope), driven oscillation may be conceived as rotation of the CM around a pivot point at a fixed distance to ...

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