Wagner, a chemistry professor at the University of Prince Edward Island, works
with fluorescent dyes to develop molecular sensors for pesticides and other
analytes. Here, he dissolved the fluorescent molecules perylene (top) and
fluorescein (bottom) in the immiscible solvents hexane and water, respectively.
Shining ultraviolet light on the solutions reveals two distinctly fluorescing
Submitted by Brian Wagner, University of Prince Edward Island
Newton and the Apple was conceived from a passion of love, knowledge and design. Its artist, “Gemma” holds a PhD in Auditory Neuroscience. Inspired by minimalism, famous scientists, formulas and the overall field of science, she creates stationary gets with a sentimental and clever value. You can find her entire collection of stationery in herEtsy shop.
Recent technological and scientific advances have fuelled a neuroscientific revolution. Imaging techniques such as those shown above have given us an unprecedented view into the structure and function of our brain.
Secreted from the glands of poison dart frogs in South
America, batrachotoxin is fatal at a dosage of just 0.1 milligrams. That’s
equivalent to around two grains of table salt. After exposure, the toxin jams
open the ion channels in its victim’s nervous system, forcing muscles to fire
continuously. In around 10 minutes, the heart and lungs will seize.
just about the most potent toxin on the planet. But
killing power aside, the most compelling thing about batrachotoxin is
how it reveals large holes in our understanding of evolution.
In 1989, a graduate student from the University of Chicago
named Jack Dumbacher was studying birds of paradise in Papua New Guinea. He was
trying to catch them in nets but kept getting another bird, called a pitohui,
“So I had two or three in a net and was pulling them out, and they scratched
my hand,” he recalled over the phone. “I licked my cuts and instantly felt my
tongue start to tingle and burn. After a moment it went numb and I thought Hey,
maybe I shouldn’t have done that.”…
Please go check revisingigcse.com (link in the bio). We (Jasmine + Sherry) put a lot of effort into this so I hope you can all check it out and show some support. The website is about igcse. It includes all our personal notes + resources + tips and more!! Hopefully it will help some of you through igcse/gcse!!