Publications by authors named "Cheng-Long Xu"
Article Synopsis
- This study focuses on improving the enzyme Fe-type Nitrile hydratase (Fe-type NHase) from Pseudomonas fluorescens by mutating a specific residue (Q86) in its substrate access tunnel, which enhanced its catalytic performance.
- The modified enzyme, PfNHase-αQ86W, demonstrated significantly increased catalytic activity towards various nitrile substrates, with a notable 17.32-fold improvement in efficiency for benzonitrile compared to the wild type.
- Structural analyses revealed changes in the enzyme's entrance tunnel and substrate-binding pocket, which contributed to a shift in substrate preference from aliphatic to aromatic nitriles, supported by molecular dynamics simulations.
[Optical characteristics of InGaN/GaN light emitting diodes on patterned sapphire substrate].
Guang Pu Xue Yu Guang Pu Fen Xi
January 2012
In the present paper, optical characteristics of InGaN/GaN multiple quantum wells light emitting diodes fabricated on the conventional (C-LEDs) and patterned sapphire substrates (PSSLEDs) were investigated by electroluminescence (EL) and photoluminescence (PL). PSSLEDs show higher light output power and smaller full width at half maximum (FWHM) of EL than those of C-LEDs for their better crystalline quality. The FWHM of EL for PSSLEDs exhibits faster broadening as current increases than C-LEDs, while the same broadening of FWHM of PL as excitation power increases is shown in PSSLEDs and C-LEDs, which indicate that there is stronger band filling effect in PSSLEDs caused by relatively higher carrier density in their QWs at the same current injection level.
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