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John Hewitt

John Hewitt

Author

John's background is physics and neuroscience. He worked in industry for many years in a variety electrical and mechanical engineering roles. He also ran CRE precision, a machine shop specializing in the design of biomedical instruments, for 10 years. He sold the business in 2012 to pursue the goal of full time science reading, and has been able to find gainful employment writing in the fields of neuroscience, cell biology, and general technology.

Articles by John Hewitt

Phys.org / Origin of the Eukaryotic cell: Part I - How to train your endosymbiont

(Phys.org)—"The origin and evolution of eukaryotes" is a tale that has yet to be told. At this point in time, it exists only as the title of a fascinating new compendium that has just been produced by the Cold Spring Harbor ...

Dec 4, 2014
Medical Xpress / Built for speed: paranodal junction assembly in high performance nerves

(Medical Xpress)—The nervous system is host to some of the most sophisticated cellular structures found anywhere in the body. The orderly phalanxes of sterocilia which arm the ear's inner hair cells, and the photosensitive ...

Nov 21, 2014
Medical Xpress / Have you taken the trillion odor challenge?

(Medical Xpress)—Butterscotch can be made by heating brown sugar and butter together according to some predefined proportion. Although one might imagine an infinite variety of butterscotches might be crafted through the addition ...

Nov 11, 2014
Medical Xpress / New viral tools for mapping brains

(Medical Xpress)—A brain-computer-interphase that is optogenetically-enabled is one of the most fantastic technologies we might envision today. It is likely that its full power could only be realized under the guidance of ...

Oct 31, 2014
Medical Xpress / A closer look at the blood-brain barrier

(Medical Xpress)—Thousands of people today have various kinds of stimulators placed deep in their brains in the hope of curing their ills. Many others require systems of tubes, catheters, and shunts penetrating deep into ...

Oct 7, 2014
Phys.org / The origins of handedness in life

Handedness is a complicated business. To simply say life is left-handed doesn't even begin to capture the blooming hierarchy of binary refinements it continues to evolve. Over the years there have been numerous imaginative ...

Oct 1, 2014
Medical Xpress / Axons growing out of dendrites? Neuroscientists hate when that happens

(Medical Xpress)—The well-behaved neuron receives signals through its many dendrites to generate spikes on a single axon. The electrical energy of these signals is generally believed to be integrated at the cell body and ...

Sep 30, 2014
Phys.org / The ultimate biofilament: Hagfish slime

(Phys.org) —Perhaps the worst fate to be had in the sea is to be slimed by the hagfish. The proteinaceous goo they secrete has gotten many a hagfish out of bind by gumming up the gills and suffocating a would be attacker. ...

Sep 25, 2014
Medical Xpress / Ultrafast spikes carry supra-kilohertz signals in the cerebellum

(Medical Xpress)—One of the challenges in high energy physics is to understand the origin of cosmic rays. The problem is that although these rays continue to be observed at ever higher energies, there is currently no known ...

Sep 18, 2014
Medical Xpress / When spikes collide: Shaking the foundation of neuroscience

(Medical Xpress)—What happens when pulses on axons collide? Fortunately for neuroscience, that usually only happens when neuroscientists artificially create counter-propagating pulses to study connections. In real brains ...

Sep 10, 2014
Medical Xpress / Better living through mitochondrial derived vesicles

(Medical Xpress)—As principal transformers of bacteria, organelles, synapses, and cells, vesicles might be said to be the stuff of life. One need look no further than the rapid rise to prominence of The international Society ...

Aug 19, 2014
Phys.org / Electron spin changes as a general mechanism for general anesthesia?

(Phys.org) —How does consciousness work? Few questions if any could be more profound. One thing we do know about it, jokes biophysicist Luca Turin, is that it is soluble in chloroform. When you put the brain into chloroform, ...

Aug 11, 2014
Medical Xpress / The fastest neurons in the brain

(Medical Xpress)—If you ask a child which is the world's fastest animal, they may tell you anything from cheetah, falcon or swift, to sailfish. If you ask a neuroscientist what is the fastest spiking neuron, you probably ...

Aug 7, 2014
Phys.org / Fiber optic light pipes in the retina do much more than simple image transfer

(Phys.org) —Having the photoreceptors at the back of the retina is not a design constraint, it is a design feature. The idea that the vertebrate eye, like a traditional front-illuminated camera, might have been improved somehow ...

Jul 21, 2014
Medical Xpress / How does the cerebellum work?

(Medical Xpress)—Nothing says "don't mess with me" like a deeply-fissured cortex. Even the sharpest jaws and claws in the animal kingdom are worthless without some serious thought muscle under the hood. But beneath the highly ...

Jul 17, 2014