Zeroth- and first-order long range non-diffracting Gauss-Bessel beams generated by annihilating multiple-charged optical vortices.

We demonstrate an alternative approach for generating zeroth- and first-order long range non-diffracting Gauss-Bessel beams (GBBs). Starting from a Gaussian beam, the key point is the creation of a bright ring-shaped beam with a large radius-to-width ratio, which is subsequently Fourier-transformed by a thin lens. The phase profile required for creating zeroth-order GBBs is flat and helical for first-order GBBs with unit topological charge (TC).

Evaluation of FT-NIR and ATR-FTIR spectroscopy techniques for determination of minor odd- and branched-chain saturated and trans unsaturated milk fatty acids.

Determination of nutritionally important trans MUFA, CLA, and OBCFA milk fatty acids (often present in amounts lower than 1.0 g/100 g of total fat) using fast and nondestructive analytical methods would enhance their use as diagnostic tools in dairy herd and human health management. Here, PLS regression using ATR/FTIR spectra indicated potential for determination of trans-11 C18:1 and trans-12 C18:1 (Rcv² ≥ 0.

Determining milk isolated and conjugated trans-unsaturated fatty acids using fourier transform Raman spectroscopy.

The feasibility of Raman spectroscopy in combination with partial least-squares (PLS) regression for the determination of individual or grouped trans-monounsaturated fatty acids (trans-MUFA) and conjugated linoleic acids (CLA) in milk fat is demonstrated using spectra obtained at two temperature conditions: room temperature and after freezing at -80 °C. The PLS results displayed capability for direct semiroutine quantification of several individual CLA (cis-9,trans-11 and trans-10,cis-12 C18:2) and trans-MUFA (trans-4-15 C18:1) in minor concentrations (below 1.0 g/100 g of milk fat).

Connection between black-hole quasinormal modes and lensing in the strong deflection limit.

The purpose of the current Letter is to give some relations between gravitational lensing in the strong-deflection limit and the frequencies of the quasinormal modes of spherically symmetric, asymptotically flat black holes. On the one side, the relations obtained can give a physical interpretation of the strong-deflection limit parameters. On the other side, they also give an alternative method for the measurement of the frequencies of the quasinormal modes of spherically symmetric, asymptotically flat black holes.

Ion-implanted polymethyl methacrylate beam splitter/coupler for 1.55 microm applications.

The applicability of layers of ion-implanted polymethyl methacrylate (PMMA) for beam splitting of laser light at the telecommunications wavelength of 1.55 mum is examined. Bulk PMMA is studied, subjected to low-energy (50 keV) silicon ion implantation at various ion fluences in the range from 10(14) to 10(17) cm(-2).

The luminescence response of Eu(III)-thenoyltrifluoroacetonate complexes upon preresonant excitation with femtosecond laser pulses.

The luminescence of thenoyltrifluoroacetonate (TTA) coordination complexes of trivalent europium ion (Eu(III)) in aqueous solutions and in solid-state polymeric films is probed upon single- and two-photon preresonant excitation with Ti:sapphire femtosecond laser. Particularly, diamine-liganded Eu(III)(TTA)(3) and poly(oxyethylene phosphate)tris(beta-diketonate)Eu(III) complexes are examined aiming their possible applications as luminescent labels for sensing and imaging of biological molecules. Even at a pre-resonance, the excitation of these compounds with high-intensity, broadband light of frequency-doubled Ti:sapphire femtosecond laser centered around 400 nm results in a luminescence response suitable for fluorometric applications.

2S storage protein gene of Douglas-fir: characterization and activity of promoter in transgenic tobacco seeds.

To date a few sequences regulating expression of conifer seed-specific genes have been reported. To characterize Douglas-fir (Pseudotsuga menziesii [Mirb] Franco) 2S albumin storage protein genes, a genomic DNA sequence containing upstream promoter sequences was isolated by screening a Douglas-fir genomic library. Sequence analysis of the Douglas-fir gPm2S1 promoter revealed the presence of RY-repeated elements (GCATGC), and multiple E-box motifs (CANNTG) and ACGT-core elements, features characteristic of 2S storage protein genes in angiosperms.

Effect of cadmium treatment on the expression of chimeric genes in transgenic tobacco seedlings and calli.

Transgenic tobacco plants and calli bearing the bacterialuid A gene under the transcriptional control ofrbcS, mas and CaMV35S promoter(s) were exposed to different concentrations of cadmium. The transcriptional activity of the promoters was monitored using p-nitrophenyl β-D-g1ucuronide as a substrate for the β-glucuronidase (uidA) reporter enzyme. Therbc S promoter was repressed by high concentrations of cadmium.