3,823 research outputs found
Ablative resin Patent
Ablative resins used for retarding regression in ablative materia
Thermally stable laminating resins Final report
Polyimide resin and resin reinforced composite
Reinforced structural plastics
Reinforced polyimide structures are described. Reinforcing materials are impregnated with a suspension of polyimide prepolymer and bonded together by heat and pressure to form a cured, hard-reinforced, polyimide structure
New rapid-curing, stable polyimide polymers with high-temperature strength and thermal stability
Additive-type polymerization reaction forms thermally stable polyimide polymers, thereby eliminating the volatile matter attendant with the condensation reaction. It is based on the utilization of reactive alicyclic rings positioned on the ends of polyimide prepolymers having relatively low molecular weights
Cytochemical and histochemical characterization of cotyledonary bodies from Pharbitis nil seedlings
Cytological
and
histochemical
characterization
of
the
structures
from
which
an
obscure
substance
is
secreted
via
open
stomata
to
the
abaxial
surface
of
Japanese
morning
glory
(Pharbitis
nil
Choisy
cv.
Violet)
cotyledons
has
been
carried
out.
Observation
of
intact
cotyledons
using
the
light
microscope
revealed
randomly
distributed
semi-transparent
structures.
These
structures,
which
were
shown
to
be
the
same
as
those
previously
described
as
giant
oil
cells
are
referred
to
here
as
cotyledonary
bodies.
These
bodies
can
be
eas-
ily
isolated
and
purified
after
enzymatic
digestion
of
the
cotyledons.
Using
different
staining
procedures
we
have
confirmed
that
each
cotyledonary
body
originates
from
an
individual
mesophyll
cell
dur-
ing
embryo
development.
Purified
bodies
consist
of
(i)
a
thick
shell-
like
envelope;
(ii)
a
transparent,
hydrophilic
zone;
(iii)
a
hydropho-
bic
core.
Hydrophobic
contents
of
the
bodies
were
readily
extracted
with
methanol
and
shown
to
contain
fatty
acids
and
phenolic
com-
pounds
using
the
gas
chromatography/mass
spectrometry
(GC/MS)
technique.
Methanolic
extracts
of
cotyledonary
bodies
showed
high
fluorescence
with
two
excitation
and
emission
maxima.
Using
a
flu-
orescence
microscope
we
have
shown
that
the
bodies
isolated
from
seedlings
grown
in
continuous
light,
conditions
non-inductive
for
flowering,
and
those
grown
under
conditions
inductive
for
flowering
(a
single
16
h,
long
dark
period)
have
different
fluorescence
emis-
sion
spectra.
Different
levels
of
free
Ca
2+
inside
cotyledonary
bodies
isolated
from
light-grown
and
single
dark-period
treated
P.
nil
seed-
lings
were
found
using
the
fluorescent
calcium
indicator
dye
Fluo-3
under
a
confocal
scanning
laser
microscope.
On
the
basis
of
these
observations
we
speculate
that
cotyledonary
bodies
could
be
in-
volved
in
floral
induction
Prevention of childhood poisoning in the home: overview of systematic reviews and a systematic review of primary studies
Unintentional poisoning is a significant child public health problem. This systematic overview of reviews, supplemented with a systematic review of recently published primary studies synthesizes evidence on non-legislative interventions to reduce childhood poisonings in the home with particular reference to interventions that could be implemented by Children's Centres in England or community health or social care services in other high income countries. Thirteen systematic reviews, two meta-analyses and 47 primary studies were identified. The interventions most commonly comprised education, provision of cupboard/drawer locks, and poison control centre (PCC) number stickers. Meta-analyses and primary studies provided evidence that interventions improved poison prevention practices. Twenty eight per cent of studies reporting safe medicine storage (OR from meta-analysis 1.57, 95% CI 1.22–2.02), 23% reporting safe storage of other products (OR from meta-analysis 1.63, 95% CI 1.22–2.17) and 46% reporting availability of PCC numbers (OR from meta-analysis 3.67, 95% CI 1.84–7.33) demonstrated significant effects favouring the intervention group. There was a lack of evidence that interventions reduced poisoning rates. Parents should be provided with poison prevention education, cupboard/drawer locks and emergency contact numbers to use in the event of a poisoning. Further research is required to determine whether improving poison prevention practices reduces poisoning rates
Transplantation in children
Kidney transplantation in very young children, less than 2 years of age, has usually failed, mainly because of difficulties maintaining these patients on hemodialysis long enough to permit retransplantation after loss of the original graft. Liver replacement in the very young child has been associated with a higher frequency of vascular and biliary obstruction than in the older child, due to the small size of these structures. Such accidents have contributed to unsatisfactory results with biliary atresia. Transplantation of kidney or liver into older children has been more successful than transplantation of these organs into adults. Related or cadaveric kidney transplantation in the child has been followed by at least a 60 per cent patient survival for 6 to 13 years and a very acceptable quality of life. Liver replacement for diseases other than biliary atresia has been followed by a 56 per cent 1 year survival rate, and two children have survived for more than 5 years
X-ray photoemission spectroscopy determination of the InN/yttria stabilized cubic-zirconia valence band offset
The valence band offset of wurtzite InN(0001)/yttria stabilized cubic-zirconia (YSZ)(111) heterojunctions is determined by x-ray photoemission spectroscopy to be 1.19±0.17 eV giving a conduction band offset of 3.06±0.20 eV. Consequently, a type-I heterojunction forms between InN and YSZ in the straddling arrangement. The low lattice mismatch and high band offsets suggest potential for use of YSZ as a gate dielectric in high-frequency InN-based electronic devices
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