SETTING: Vilnius University, Laser Research Centre, Vilnius, Lithuania
METHODS: Femtosecond pulses in the deep UV range (205 nm)
were obtained by the generation of the fifth-harmonic of an amplified Yb:KGW laser system (fundamental output at 1027 I-BET-762 nm). Coupled with galvanometric beam-scanning mirrors, this system allowed ablation shaping of transparent media, including poly(methyl methacrylate) (PMMA), collagen, and ex vivo porcine corneas. The surfaces of ablated structures were characterized using a noncontact confocal optical profiler.
RESULTS: Spherical structures were successfully formed in all 3 materials tested. A 10 0 diopter refraction change in the cornea was produced in 180 seconds The resulting surface quality was significantly higher (roughness length >100 mu m versus approximately 6 mu m) in gelatin and ex vivo corneas than in PMMA
CONCLUSION: The solid-state femtosecond UV laser system seems an attractive alternative to the currently used ophthalmic argon-fluoride excimer laser system because of its small footprint, silent operation, and ability to generate femtosecond light pulses at PR-171 cost both 1027 nm (suitable for flap creation) and 205 nm (corneal ablation).
Financial Disclosure: No author has a financial or proprietary interest in any material or method mentioned.
J Cataract Refract Surg 2010; 36.1579-1587 (C) 2010 ASCRS and ESCRS”
“The microstructure and magnetic viscosity of
bulk amorphous Nd60Fe20Al5Co10B5, prepared by suction casting the molten alloy into a copper mold under an argon atmosphere, have been investigated. The results show that clusters with size 3-5 nm are found to be embedded in the amorphous matrix of as-cast bulk amorphous Nd60Fe20Al5Co10B5 alloy. The Nd60Fe20Al5Co10B5 alloy shows hard magnetic behavior at room temperature, with an intrinsic coercivity of 360 kA/m and a remanence of 69.39 mT. The magnetic viscosity of bulk amorphous Nd60Fe20Al5Co10B5 has been investigated on the major hysteresis PF-02341066 purchase loop, and simple logarithmic time dependence is observed. A value for the fluctuation field of 8.24
kA/m is obtained. Analysis based on a Henkel plot is used to confirm the existence of magnetic interaction among clusters. The coercivity mechanism responsible for the hard magnetic behavior of bulk amorphous Nd60Fe20Al5Co10B5 alloy is also discussed. (C) 2011 American Institute of Physics. [doi:10.1063/1.3573510]“
“Functioning nephron mass is a determinant of the graft function of kidney transplant recipients. The graft kidney volume and its weight have been reported to be surrogates of the nephron mass. To investigate the impact of the ratios of the surrogates to recipient body surface area (BSA) and body weight on the graft function within six months post-transplantation, we measured the graft kidney volume, using computed tomography with 3-dimensional reconstruction before transplantation, and measured the graft kidney weight during surgery.