The results show that there are terahertz fingerprint absorptions for all of four kinds of vitamins. The terahertz absorbance
spectra of vitamins result from not only the intramolecular vibration modes, but also the intermolecular interaction or phonon modes. (C) 2009 American Institute of Physics. [doi: 10.1063/1.3259376]“
“(PACE 2009; 1336-1353).”
“Ho3+-doped and Ho3+/Yb3+-codoped lead bismuth gallate (PBG) oxide glasses were prepared and their spectroscopic properties were investigated. The derived Judd-Ofelt intensity parameters (Omega(2) = 6.81 x 10(-20) cm(2), Omega(4) = 2.31 x 10(-20) cm(2), and Omega(6) = 0.67 x 10(-20) cm(2)) indicate a higher asymmetry and stronger covalent environment for Ho3+ sites in PBG glass compared with those in tellurite, fluoride (ZBLAN), and some other lead-contained glasses. learn more Intense frequency upconversion emissions peaking at 547, 662, and 756 nm as well as infrared emissions at 1.20 and 2.05 mu m in Ho3+/Yb3+-codoped PBG glass were observed, confirming that energy transfer between Yb3+ and Ho3+ takes place, and a two-phonon-assisted energy transfer from Yb3+ to Ho3+ ions was determined by the calculation using phonon sideband theory. The 1.20 mu m emission observed was primarily due to the weak multiphonon deexcitation
originated from the small phonon energy of PBG glass (similar to 535 cm(-1)). A large product of emission cross-section and measured lifetime (9.93 x 10(-25) cm(2) s) was obtained for the 1.20 Nocodazole supplier mu m emission and the gain coefficient OSI-744 dependence on wavelength with Population inversion rate (P) was performed. The peak emission cross-section for 2.05 mu m emission was calculated to be 4.75 x 10(-21) cm(2). The relative mechanism of Ho3+-doped and Ho3+/Yb3+-codoped PBG glasses on their spectroscopic properties was also discussed. Our results suggest that Ho3+/Yb3+-doped PBG glasses are a good potential candidate for the frequency upconversion devices and infrared amplifiers/lasers. (C) 2009 American Institute of Physics. [doi:10.1063/1.3256184]“
“(PACE 2009; 1355-1356).”
“Objective: To evaluate associations between neurodevelopment
and exposure to surgery and anesthetic agents in children with single-suture craniosynostosis (SSC).
Background: Young children with SSC have unexplained neurodevelopmental delays. The possible contributions of factors related to cranial vault surgery – including anesthesia – have not been previously examined.
Methods/materials: Two anesthesiologists reviewed the surgical records of 89 infants (70 had complete data). Primary exposures were duration of surgery and anesthesia and total duration of inhaled anesthesia (at age 6 months on average). Outcomes were the cognitive and motor scores from the Bayley Scales of Infant Development-II and language scores from the Preschool Language Scale, 3rd edition, given at age 36 months. Linear regression using robust standard error estimates was performed, adjusting for age at surgery and suture site.