Summary: A simple lithographic process in conjunction with a novel biocompatible nonchemically amplified photoresist material was successfully used for cell patterning. UV light irradiation on selected regions of the nonchemically amplified resist film renders the exposed regions hydrophilic by the formation of carboxylic groups. Mouse fibroblast cells were found to be preferentially aligned and proliferated on the UV light exposed regions of the nonchemically amplified resist film where carboxylic groups were present.
Schematic representation of the simplified lithographic process used for cell patterning. 相似文献
Journal of Structural Chemistry - The structure and metal complexation studies using dispersion-corrected density functional theory methods are performed for four stable glycolic acid conformers... 相似文献
A Tb-123 phase with the composition, TbSr2Cu2.7Mo0.3O7+δ, has been synthesized in single-phase form by the solid-state reaction route. Its phase purity has been confirmed from neutron powder diffraction studies. The as-synthesized Tb-123 sample does not show superconductivity down to 5 K. On the other hand, an unusually high antiferromagnetic ordering temperature (TN) of around 7 K is seen for the Tb moments. After 120-atm-O2 post-annealing, bulk superconductivity is achieved in this compound with a superconducting transition temperature (Tc) of about 30 K, without any significant effect on TN. To achieve higher oxygen content and higher Tc, the as-synthesized sample was subjected to high-pressure oxygenation, carried out in a closed cell, at 5 GPa and 400 °C in the presence of AgO as an excess-oxygen source. This sample exhibited superconductivity onset at around 80 K with a Meissner fraction larger than 10% at 5 K. Our observation of superconductivity at 80 K is the highest Tc to-date for the Tb-123 type compounds. 相似文献
The temperature variation of the Debye-Waller factors of Cs+ and Br− ions in CsBr powder has been studied using powder X-ray diffraction. The integrated intensities of the Bragg peaks at different
temperatures have been obtained. These results have been verified by structure factor least squares refinement program. Theoretical
shell model lattice dynamical calculations have been done using a 7-parameter model in the harmonic approximation and the
values compared with the present X-ray measurements. The observed intensities have been corrected for first order thermal
diffuse scattering. 相似文献
An improved polymer electrolyte membrane (PEM) fuel cell based amperometric hydrogen sensor that operates at room temperature
has been developed. The electrolyte used in the sensor is PVA/H3PO4 blend, which is a proton conducting solid polymer electrolyte. A blend of palladium and platinum coated on the membrane is
used as anode and platinum as cathode. The sensor functions as a fuel cell, H2/Pd-Pt//PVA-H3PO4//Pt/O2, and the short circuit current is found to be linearly related to the hydrogen concentration. The present study aims at investigating
the dependence of sensor behaviour on the anode composition.
Paper presented at the 2nd International Conference on Ionic Devices, Anna University, Chennai, India, Nov. 28–30, 2003. 相似文献
This paper reports the investigation of mean and turbulent flow characteristics of a two-dimensional plane diffuser. Both experimental and theoretical details are considered. The experimental investigation consists of the measurement of mean velocity profiles, wall static pressure and turbulence stresses. Theoretical study involves the prediction of downstream velocity profiles and the distribution of turbulence kinetic energy using a well tested finite difference procedure. Two models, viz., Prandtl's mixing length hypothesis and k- model of turbulence, have been used and compared. The nondimensional static pressure distribution, the longitudinal pressure gradient, the pressure recovery coefficient, percentage recovery of static pressure, the variation of Umax/Ubar along the length of the diffuser and the blockage factor have been valuated from the predicted results and compared with the experimental data. Further, the predicted and the measured value of kinetic energy of turbulence have also been compared. It is seen that for the prediction of mean flow characteristics and to evaluate the performance of the diffuser, a simple turbulence model like Prandtl's mixing length hypothesis is quite adequate.List of symbols
C1, C2,C
turbulence model constants
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Fx
body force
-
k
kinetic energy of turbulence
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lm
mixing length
-
L
length of the diffuser
-
u, v, w
rms value of the fluctuating velocity
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u, v, w
turbulent component of the velocity
-
mean velocity in the x direction
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A
average velocity at inlet
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Ubar
average velocity in any cross section
-
Umax
maximum velocity in any cross section
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V
mean velocity in the y direction
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W
local width of the diffuser at any cross section
-
x, y
coordinates
-
dissipation rate of turbulence
-
m
eddy diffusivity
-
Von Karman constant
-
mixing length constant
-
l
laminar viscosity
-
eff
effective viscosity
-
v
kinematic viscosity
-
density
-
k
effective Schmidt number for k
-
effective Schmidt number for
-
stream function
-
non dimensional stream function 相似文献
The interaction of 2,4,6-triphenylpyrylium cation with p-sulfonatocalix[4]arene is studied using absorption, emission, NMR and electrochemical techniques. The increase in the absorption is observed with the increase in the concentration of p-sulfonatocalix[4]arene. The emission intensity of 2,4,6-triphenylpyrylium cation is also enhanced in the presence of p-sulfonatocalix[4]arene. The electrochemical titration reveals the presence of host–guest interaction. The NMR analysis explains the upper rim interaction of 2,4,6-triphenypyrylium cation with p-sulfonatocalix[4]arene. The mode of binding is studied using computational methods. The quantum chemical simulations reveal the binding orientation of cationic TPP with p-SC4. The calculated complexation energy (??33.19 kcal mol?1) indicates the strong binding nature of 2,4,6-triphenylpyrylium cation with p-sulfonatocalix[4]arene. 相似文献
Phytochemicals serve as potential therapeutic agents for the prevention and treatment of diseases. In this study, we elucidate the renoprotective activity of compounds isolated from Eucalyptus globulus and Melaleuca styphelioides extracts in glucose- and oxalate-challenged NRK-49F cell model. The antioxidant potential of isolated compounds was evaluated based on their effect on antioxidant enzyme activities and lipid peroxidation levels. The results demonstrated that exposure of NRK-49F cells to glucose and oxalate stress augmented cell damage and attenuated antioxidant enzyme activities. The phytochemicals 2,2,8-trimethyl-6-formyl-chrom-3-ene-7-O-β-D-glucopyranoside, Cornusiin B and tellimagrandin I treatment restored antioxidant enzyme activity, significantly lowered lipid peroxidation levels and effectively protected cells from glucose and oxalate stress equivalent to the known antioxidant, N-acetyl cysteine. Pterocarinin A significantly reversed cellular damage owing to glucose stress. In conclusion, the compounds isolated from E. globulus and M. styphelioides showed potential cytoprotective and anti-oxidative property against glucose- and oxalate-induced oxidative stress in NRK-49F cells. 相似文献
The development of hydrogen evolution catalysts based on nonprecious metals is essential for the practical application of water‐splitting devices. Herein, the synthesis of Co9S8?MoS2 hierarchical nanoboxes (HNBs) as efficient catalysts for the hydrogen evolution reaction (HER) is reported. The surface of the hollow cubic structure was organized by CoMoS4 nanosheets formed through the reaction of MoS42? and Co2+ released from the cobalt zeolite imidazole framework (ZIF‐67) templates under reflux in a mixture of water/ethanol. The formation process for the CoMoS4 HNB structures was characterized by TEM images recorded at various reaction temperatures. The amorphous CoMoS4 HNBs were converted through sequential heat treatments into CoSx?MoS2 and Co9S8?MoS2 HNBs. Owing to their unique chemical compositions and structural features, Co9S8?MoS2 HNBs have a high specific surface area (124.6 m2 g?1) and superior electrocatalytic performances for the HER. The Co9S8?MoS2 HNBs exhibit a low overpotential (η10) of 106 mV, a low Tafel slope of 51.8 mV dec?1, and long‐term stability in an acidic medium. The electrocatalytic activity of Co9S8?MoS2 HNBs is superior to that of recently reported values, and these HNBs prove to be promising candidates for the HER. 相似文献
Tetrahedral naphthalenediimide compound 1 has been synthesized as an example of a new class of amorphous n-type materials, in which the nondirectionality obtained by its shape is decoupled from its optoelectronic properties. 1 forms bicontinuous films with p-type polymers and effectively quenches the excited state, yielding long-lived mobile charge carriers on pulsed illumination. 相似文献