There is a growing need for photonic band gap (PBG) devices in various applications including high-Q resonators, energy-efficient solar cells, microfluidic devices, microelectromechanical systems and so on. The PBG devices, which have artificial structures whose refractive index is periodically modulated, can reflect or diffract propagating light at a wavelength comparable to lattice spacing. T...

The molecular pathology of the porphobilinogen (PBG)-deaminase deficiency in heterozygotes for acute intermittent porphyria (AIP) was investigated by means of biochemical and immunologic techniques. The stable enzyme-substrate intermediates (A, B, C, D, and E) of PBG-deaminase were separated by anion-exchange chromatography of erythrocyte lysates from heterozygotes for AIP and normal individual...

Urinary &-aminolaevulinic acid (ALA) is commonly estimated by the method of Mauzerall and Granick (I956). In that method porphobilinogen (PBG) and ALA are successively separated from the urine by ion exchange resins. A simplified procedure, omitting the initial separation of PBG, was investigated. Urine samples from 39 lead workers and controls were estimated for ALA by both the original proced...

A facile method to realize photo-responsive inverse opal photonic crystal polymer (IOPP) films with an adjustable broad-wavelength-range photonic band gap (PBG) was demonstrated in this communication. When immersing the IOPP film in malachite green carbinol base (MGCB) solution, under light irradiation, the MGCB released hydroxide ions. In this way, optical signals were converted to chemical si...

The genus Propionibacterium has a wide range of probiotic activities that are exploited in dairy and fermentation systems such as cheeses, propionic acid, and tetrapyrrole compounds. In order to improve production of tetrapyrrole compounds, we expressed the hemA gene, which encodes delta-aminolevulinic acid (ALA) synthase from Rhodobacter sphaeroides, and the hemB gene, which encodes porphobili...

Fachbereich Biologie/Botanik, Philipps-Universität Marburg. D-3550 Marburg. Bundesrepublik Deutschland Z. Naturforsch. 44c, 81 — 84 (1989); received September 26. 1988 Porphyrinogens. Euglena gracilis Z ., Porphyrin Biosynthesis. Porphobilinogenase. Euglena Chloroplasts Lysed cells as well as different fractions of isolated, disrupted chloroplasts from light grown Euglena gracilis were tested f...

We study the dielectric response of impurity two-level atoms in a photonic band gap (PBG) to an applied laser field. In this system, the atoms may exchange energy coherently by resonance dipoledipole interaction (RDDI) which is assumed to be strong compared to the spontaneous emission rate. When the applied Rabi frequency exceeds the RDDI energy scale, nonlinear saturation of the absorptive par...

BACKGROUND Combination therapy consisting of basal insulin and oral hypoglycemic agents (OHAs) is effective for the treatment of type 2 diabetes (T2DM) that cannot be adequately controlled using OHAs alone. Though basal insulin with metformin or sulfonylurea is an effective therapy, it cannot reduce postprandial glycemia without the risk of hypoglycemia. We examined a two-step regimen consistin...

We describe all-optical transistor action in photonic bandgap (PBG) materials doped with active atoms and analyse the advantages of this system over other all-optical transistor proposals. In the presence of a PBG material, a coherent laser beam with the frequency slightly detuned from the resonant atomic transition frequency can drive a collection of two-level atoms to an almost totally invert...

Although acute myocardial ischemia or infarction may induce the Bezold-Jarisch (BJ) reflex through the activation of serotonin receptors on vagal afferent nerves, the mechanism by which the BJ reflex modulates the dynamic characteristics of arterial pressure (AP) regulation is unknown. The purpose of this study was to examine the effects of the BJ reflex induced by intravenous phenylbiguanide (...