Multiwavelength spectroscopy is a rapid analytical technique that can be applied to detect, identify, and quantify microorganisms such as Karenia brevis, the species known for frequent red-tide blooms in Florida’s coastal waters. This research will report on a model-based interpretation of UV–vis spectra of K. brevis. The spectroscopy models are based on light scattering and absorption theories...

Al2S3 thin films on glass substrate have been deposited by chemical bath deposition technique at temperatures 300K and 373K. Aqueous solution of 50ml containing AlCl3, Thiourea and EDTA, where AlS3 and thiourea were the sources of Al and S and EDTA was used as a complexing agent. Al2S3 films were prepared at various bath temperatures while the deposition period was kept fixed at 2 hours. The ef...

The introduction of pump-probe techniques to the field of x-ray absorption spectroscopy (XAS) has allowed the monitoring of both structural and electronic dynamics of disordered systems in the condensed phase with unprecedented accuracy, both in time and in space. We present results on the electronically excited high-spin state structure of an Fe(II) molecular species, [Fe(bpy)3] , in aqueous s...

Chemical vapor deposition of graphene on copper foil is an attractive method of producing large-area graphene films, but the electronic performance is limited by defects such as creases from the film transfer process, wrinkles due to the thermal expansion coefficient mismatch, and grain boundaries from the growth process. Here we present an all-optical technique to correlate defect structure wi...

Studying the structure of disordered and partially ordered materials is notoriously difficult. Recently, significant advances have been made using the atomic pair distribution function (PDF) analysis of powder diffraction data coupled with the use of advanced X-ray and neutron sources and fast computers. Here we summarize some of the more spectacular successes of this technique in studying the ...

Total reflection X-ray fluorescence analysis (TXRF) using monochromatized undulator radiation in the PTB radiometry laboratory at the synchrotron radiation facility BESSY II has been employed to investigate the chemical state of nitrogen compounds in aerosols. The aerosol samples of different size fractions were deposited on silicon wafer surfaces in a May impactor. Using a thin window Si(Li) d...

The influence of change in deposition conditions of silane concentration and substrate temperature on optical properties of hydrogenated microcrystalline silicon thin film samples prepared by Plasma Enhanced Chemical Vapor Deposition (PECVD) technique, are investigated. The crystalline volume fraction for the samples determined from Raman spectra are correlated with the silane concentration, su...

AIMS To test whether use of infant formula containing synthetic structured triglycerides results in: (i) increased palmitate absorption; (ii) increased total fat absorption; (iii) reduction in calcium soap formation in the gut; and hence (iv) increased calcium absorption. METHODS A randomised study was made of 24 infants comparing three formulas, one containing the synthetic fat Betapol with ...