Absorption Spectra Of Suspensions Research Articles

Нелинейное просветление InAs нитевидных нанокристаллов в видимом диапазоне

The spectral and nonlinear optical properties of InAs nanowires suspensions in isopropanol were studied at room temperature. InAs nanowires were synthesized by molecular beam epitaxy. The absorption spectra of suspensions with a characteristic maximum at a wavelength of 235 nm were obtained, as well as Raman spectra in the range 180–280 cm – 1. The nonlinear transmission of InAs nanowires with a diameter less than the Bohr radius of the exciton upon two-photon excitation in the transparency region in the visible range (λ = 468 nm) was studied firstly. The effect of cumulative bleaching was discovered, the manifestation of which is associated with the dynamic Stark effect.

The influence of PAR irradiance on yield growth of Chlorella microalgae

The experiment indicated the influence of different PAR irradiance conditions on biomass growth of Chlorella vulgaris Beijer stock culture. The absorption spectrum of suspension was evaluated with spectrophotometer SF-256 UVI LOMO Photonika. In this work, effects of LED lamps with various radiant powers on yield gain were compared by analyzing the relation between cells concentration increase and time. It was concluded, that light is the most important factor influencing growth and cells development, as well as nutrient solution, temperature and carbon dioxide provision.

O2-stimulated synthesis of bacteriochlorophyll and carotenoids in marine bacteria

We examined the effects of a limitation of the O2-supply on the syntheses of bacteriochlorophyll ap and carotenoids in isolates of aerobic marine bacteria, OCh 101 and OCh 114, grown heterotrophically. Whereas they formed these pigments fairly well under high aeration in the dark, a limitation of the O2-supply resulted in the decreased syntheses of bacteriochlorophyll in both strains. Syntheses of carotenoids also were depressed under low aeration but to a lesser extent (especially in OCh 101) than the depression of bacteriochlorophyll synthesis. Aerobic incubation of a culture of OCh 101, that previously had been grown semiaerobically, induced the supplementary synthesis of bacteriochlorophyll. This induction was inhibited almost completely by chloram-phenicol. The absorption spectra of suspensions and solvent extracts of cells grown aerobically or semiaerobically are reported.