6 research outputs found
Reason for normalization from Variation in wall shear stress in channel networks of zebrafish models
Normalization to express flow rate and resistanc
Derivation of equation for resistance from Variation in wall shear stress in channel networks of zebrafish models
Derivation of equation for resistance of blood vesse
CFL thickness measurement techniques from Variation in wall shear stress in channel networks of zebrafish models
Measurement techniques for cell free layer thicknes
Effect of blocking procedure for 1h from Variation in wall shear stress in channel networks of zebrafish models
Blood flow in the blood-vessel network is visualized with the standard deviation projection method after (a) 30 min and (b) 1 h from the blocking of blood flow at the ISV
New Flavonol Glucuronides from the Flower Buds of <i>Syzygium aromaticum</i> (Clove)
Repeated chromatography
of the EtOAc-soluble fraction from the
70% EtOH extract of the flower buds of <i>Syzygium aromaticum</i> (clove) led to the isolation and characterization of four new flavonol
glucuronides, rhamnetin-3-<i>O</i>-β-d-glucuronide
(<b>1</b>), rhamnazin-3-<i>O</i>-β-d-glucuronide (<b>2</b>), rhamnazin-3-<i>O</i>-β-d-glucuronide-6″-methyl ester (<b>3</b>), and rhamnocitrin-3-<i>O</i>-β-d-glucuronide-6″-methyl ester
(<b>4</b>), together with 15 flavonoids (<b>5</b>–<b>19</b>) having previously known chemical structures. The structures
of the new compounds <b>1</b>–<b>4</b> were determined
by interpretation of spectroscopic data, particularly by 1D- and 2D-NMR
studies. Six flavonoids (<b>6</b>, <b>7</b>, <b>9</b>, <b>14</b>, <b>18</b>, and <b>19</b>) were isolated
from the flower buds of <i>S. aromaticum</i> for the first
time in this study. The flavonoids were examined for their cytotoxicity
against human ovarian cancer cells (A2780) using MTT assays. Among
the isolates, pachypodol (<b>19</b>) showed the most potent
cytotoxicity on A2780 cells with an IC<sub>50</sub> value of 8.02
μM
Factors Affecting the Rate of CO<sub>2</sub> Absorption after Partial Desorption in NaNO<sub>3</sub>‑Promoted MgO
Sodium
nitrate (NaNO<sub>3</sub>) and other alkali nitrates are
known to accelerate the CO<sub>2</sub> absorption rate of MgO above
their melting points. This absorption rate is further enhanced if
absorption is performed after partial desorption. Moreover, it does
not show any induction period, which is otherwise present if absorption
is performed after complete desorption. A thorough study of various
factors affecting the rate after partial desorption is performed in
this work. We exposed a sample to CO<sub>2</sub> for several different
periods before partial desorption and N<sub>2</sub> for several different
periods during partial desorption in a thermogravimetric analyzer.
Absorbents were also characterized by X-ray diffraction (XRD), Brunauer–Emmett–Teller
(BET), and scanning electron microscopy (SEM) and studied in an <i>in situ</i> infrared (IR) cell to understand the changes at
the molecular scale. The absorbed amount of CO<sub>2</sub> with a
fast initial rate after partial desorption is affected by both the
amount of CO<sub>2</sub> absorbed before partial desorption as well
as the amount of MgO formed during partial desorption. <i>In
situ</i> IR studies showed that two phases of bulk MgCO<sub>3</sub> were formed along with the surface carbonate. It can be concluded
from the thermogravimetric analysis (TGA) and <i>in situ</i> IR study that defects in MgO, which were introduced from the defect
MgCO<sub>3</sub> phase during partial desorption, are responsible
for the faster rate after partial desorption. It seems that substitution
of nitrate ions in the MgCO<sub>3</sub> phase is responsible for the
defect MgCO<sub>3</sub> phase (out-of-plane bending vibration at 876
cm<sup>–1</sup>)