Analytical Chemistry,
Journal Year:
2019,
Volume and Issue:
91(15), P. 9333 - 9342
Published: June 25, 2019
Cellular
imaging
is
an
active
area
of
research
that
enables
researchers
to
monitor
cellular
dynamics,
as
well
responses
various
external
stimuli
(physiological
stress,
exogenous
compounds,
etc.).
Stimulated
Raman
scattering
(SRS)
microscopy
one
popular
experimental
tool
used
image
cells,
largely
because
its
chemical
specificity,
high
spatial
resolution,
and
acquisition
speed.
In
this
Perspective,
the
theoretical
background
implementation
SRS
are
discussed
recent
developments
in
field
with
highlighted
summarized.
Biomedical Optics Express,
Journal Year:
2019,
Volume and Issue:
10(8), P. 3860 - 3860
Published: July 10, 2019
Stimulated
Raman
scattering
(SRS)
microscopy
is
a
label-free
quantitative
chemical
imaging
technique
that
has
demonstrated
great
utility
in
biomedical
applications
ranging
from
real-time
stain-free
histopathology
to
live
animal
imaging.
However,
similar
many
other
nonlinear
optical
techniques,
SRS
images
often
suffer
low
signal
noise
ratio
(SNR)
due
absorption
and
of
light
tissue
as
well
the
limitation
applicable
power
minimize
photodamage.
We
present
use
deep
learning
algorithm
significantly
improve
SNR
images.
Our
based
on
U-Net
convolutional
neural
network
(CNN)
outperforms
existing
denoising
algorithms.
More
importantly,
we
demonstrate
trained
acquired
at
different
zoom,
power,
depth,
geometries
are
not
included
training.
results
identify
powerful
tool
for
large,
with
potential
towards
vivo
applications,
where
parameters
variable
ground-truth
available
create
fully
supervised
training
set.
Advanced Science,
Journal Year:
2020,
Volume and Issue:
7(19)
Published: Aug. 16, 2020
Rapid
antimicrobial
susceptibility
testing
(AST)
is
urgently
needed
for
treating
infections
with
appropriate
antibiotics
and
slowing
down
the
emergence
of
antibiotic-resistant
bacteria.
Here,
a
phenotypic
platform
that
rapidly
produces
AST
results
by
femtosecond
stimulated
Raman
scattering
imaging
deuterium
oxide
(D2
O)
metabolism
reported.
Metabolic
incorporation
D2
O
into
biomass
in
single
bacterium
metabolic
response
to
are
probed
as
short
10
min
after
culture
70%
medium,
fastest
among
current
technologies.
Single-cell
inactivation
concentration
(SC-MIC)
obtained
less
than
2.5
h
from
colony
results.
The
SC-MIC
37
sets
bacterial
isolate
samples,
which
include
8
major
species
14
different
often
encountered
clinic,
validated
standard
minimal
inhibitory
blindly
measured
via
broth
microdilution.
Toward
clinical
translation,
determination
1
antibiotic
treatment
30
mixture
incubation
bacteria
urine
or
whole
blood
demonstrated.
Biomedical Optics Express,
Journal Year:
2019,
Volume and Issue:
10(9), P. 4437 - 4437
Published: Aug. 5, 2019
We
present
a
rapidly
tunable
dual-output
all-fiber
light
source
for
coherent
Raman
imaging,
based
on
dispersively
matched
mode-locked
laser
pumping
parametric
oscillator.
Output
pump
and
Stokes
pulses
with
maximal
power
of
170
400
mW,
respectively,
equal
durations
7
ps
could
be
generated.
The
tuning
mechanism
required
no
mechanical
delay
line,
enabling
all-electronic
arbitrary
wavelength
switching
across
more
than
2700
cm-1
in
less
5
ms.
compact
setup
showed
reliable
operation
despite
shocks
25
m/s2
is,
thus,
well
suited
mobile
cart.
Imaging
mouse
human
skin
tissue
both
the
portable
commercial
laboratory-bound
reference
system
yielded
qualitatively
results
verified
being
microscopy.
Journal of the American Chemical Society,
Journal Year:
2020,
Volume and Issue:
142(49), P. 20701 - 20707
Published: Nov. 23, 2020
Raman
probes
based
on
alkyne
or
nitrile
tags
hold
promise
for
highly
multiplexed
imaging.
However,
sensing
of
enzyme
activities
with
is
difficult
because
few
mechanisms
are
available
to
modulate
the
vibrational
response.
Here
we
present
a
general
strategy
prepare
activatable
that
show
enhanced
signals
due
electronic
preresonance
(EPR)
upon
reaction
enzymes
under
physiological
conditions.
We
identified
xanthene
derivative
bearing
group
at
position
9
(9CN-JCP)
as
suitable
scaffold
dye,
and
synthesized
four
types
probes,
which
targeted
different
(three
aminopeptidases
glycosidase)
tuned
frequencies
by
isotope
editing
group.
validated
activation
these
target
succeeded
in
simultaneous
imaging
live
cells.
Different
cell
lines
showed
patterns
activities.
Sensors,
Journal Year:
2019,
Volume and Issue:
19(5), P. 1028 - 1028
Published: Feb. 28, 2019
In
this
manuscript,
recent
advancements
in
the
area
of
minimally-invasive
transdermal
biosensing
and
drug
delivery
are
reviewed.
The
administration
therapeutic
entities
through
skin
is
complicated
by
stratum
corneum
layer,
which
serves
as
a
barrier
to
entry
retards
bioavailability.
A
variety
strategies
have
been
adopted
for
enhancement
permeation
various
substances.
Physical
techniques
such
iontophoresis,
reverse
electroporation,
microneedles
offer
(a)
electrical
amplification
sensing
biomolecules
(b)
transport
amphiphilic
molecules
targeted
site
minimally
invasive
manner.
Iontophoretic
involves
application
low
currents
well
migration
polarized
neutral
across
it.
Transdermal
via
has
emerged
novel
approach
replace
hypodermic
needles.
addition,
facilitated
detection
analytes
body
fluids.
This
review
considers
innovations
structure
performance
systems.
Nature Communications,
Journal Year:
2021,
Volume and Issue:
12(1)
Published: June 7, 2021
Abstract
Single-cell
multiparameter
measurement
has
been
increasingly
recognized
as
a
key
technology
toward
systematic
understandings
of
complex
molecular
and
cellular
functions
in
biological
systems.
Despite
extensive
efforts
analytical
techniques,
it
is
still
generally
challenging
for
existing
methods
to
decipher
large
number
phenotypes
single
living
cell.
Herein
we
devise
multiplexed
Raman
probe
panel
with
sharp
mutually
resolvable
peaks
simultaneously
quantify
cell
surface
proteins,
endocytosis
activities,
metabolic
dynamics
an
individual
live
When
coupling
whole-cell
spontaneous
micro-spectroscopy,
demonstrate
the
utility
this
technique
14-plexed
live-cell
profiling
phenotyping
under
various
drug
perturbations.
In
particular,
single-cell
enables
powerful
clustering,
correlation,
network
analysis
insights.
This
platform
compatible
cytometry,
low
instrument
complexity
capable
highly
robust
straightforward
manner,
thereby
contributing
valuable
tool
both
basic
biology
translation
applications
such
high-content
sorting
discovery.
Nature Communications,
Journal Year:
2021,
Volume and Issue:
12(1)
Published: May 25, 2021
Photochromic
probes
with
reversible
fluorescence
have
revolutionized
the
fields
of
single
molecule
spectroscopy
and
super-resolution
microscopy,
but
lack
sufficient
chemical
specificity.
In
contrast,
Raman
stimulated
scattering
(SRS)
microscopy
provides
superb
resolution
for
super-multiplexed
imaging,
are
relatively
inert.
Here
we
report
vibrational
photochromism
by
engineering
alkyne
tagged
diarylethene
to
realize
photo-switchable
SRS
imaging.
The
narrow
peak
group
shifts
reversibly
upon
photoisomerization
conjugated
when
irradiated
ultraviolet
(UV)
or
visible
light,
yielding
"on"
"off"
images
taken
at
photoactive
frequency.
We
demonstrated
photo-rewritable
patterning
encryption
on
thin
films,
painting/erasing
cells
labelled
alkyne-diarylethene,
as
well
pulse-chase
experiments
mitochondria
diffusion
in
living
cells.
design
principle
potentials
optical
memories
switches
Spectrochimica Acta Part A Molecular and Biomolecular Spectroscopy,
Journal Year:
2022,
Volume and Issue:
276, P. 121217 - 121217
Published: April 1, 2022
Metabolic
dynamics
of
bacterial
cells
is
needed
for
understanding
the
correlation
between
changes
in
environmental
conditions
and
cell
metabolic
activity.
In
this
study,
Raman
spectroscopy
combined
with
deuterium
labelling
was
used
to
analyze
activity
a
single
Escherichia
coli
O157:H7
cell.
The
incorporation
from
heavy
water
into
cellular
biomolecules
resulted
formation
carbon-deuterium
(CD)
peaks
spectra,
indicating
broad
vibrational
corresponding
CD
CH
encompassed
different
specific
shifts
macromolecules
such
as
protein,
lipids,
nucleic
acid.
utilization
tryptophan
oleic
acid
by
sole
carbon
source
led
lipid
composition,
indicated
new
second
derivative
spectra.
Thus,
proposed
method
could
semi-quantitatively
determine
total
activity,
macromolecule
identification,
protein
metabolism