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BioOptics News &
63 Single-objective SPIM
3D cell imaging
63 Laser Doppler records
bloodflow to enable early
72 Ultrahigh peak
bioimaging Julien Klein
Roadside drug testing
As states in the U.S. begin to experiment with marijuana (
cannabis) legalization, society is seeing the need for a test similar to
the “breathalyzer” used to detect blood alcohol levels in drivers.
The main pharmacologically active constituent of cannabis,
Δ9-tetrahydrocannabinol (THC), has been shown to decrease
psychomotor performance significantly in single doses for up
to 3 hours under actual driving conditions (and up to 24 hours
in lab studies). Still, the ideas persist that marijuana is “natural,
not harmful,” and “not as bad as alcohol”—especially among
This summer, Holomic LLC demonstrated the Holomic Substance Abuse Test Assistant (HSTA), an economical, quantitative smart-phone-based test assistant for photonics-enabled assessment of intoxication by
marijuana, among other substances.
If you know how current tests work to measure marijuana use, and you know
that THC remains detectable in the body for weeks, you might wonder how roadside testing with instantaneous results is possible. Holomic’s system exploits the
fact that THC in saliva indicates recent use.
Because of societal and legal issues, implementation of such systems has a
long road ahead. But at least developers like Holomic have got us on that road.
Ultrafast laser light enables
mini x-ray source for 3D
imaging of tissue
Ultrafast laser-generated x-rays
help to produce 3D images of soft
tissue structures in organisms.
method, gold nanotubes
destroy cancer cells
Scientists have demonstrated that
gold nanotubes can serve as agents
for destroying cancer cells.
LEDs enable ultrafast
thermal cycling for cheaper
LEDs can help expand the polymerase
chain reaction (PCR) test, with
results ready in minutes.