Crystal Growth and Raman Spectroscopy Study of Sm_1–<i>x</i>La_<i>x</i>Fe₃(BO₃)₄ Ferroborates

Sm_1–<i>x</i>La_<i>x</i>Fe₃(BO₃)₄ (<i>x</i> = 0, 0.75) single crystals were synthesized using the flux method. The crystal nucleation procedure and flux parameters are reported. Conditions for growing the Sm_1–<i>x</i>La_<i>x</i>Fe₃(BO₃)₄ (<i>x</i> = 0, 0.75) single crystals are described. The prepared crystals were studied by Raman spectroscopy in the temperature range of <i>T</i> = 10–300 K. The spectral region corresponding to temperatures of <i>T</i> = 10–55 K, which involves the temperatures of the magnetic phase transition <i>T</i>_N = 32 K for <i>x</i> = 0 and <i>T</i>_N = 31 K for <i>x</i> = 0.75, was thoroughly analyzed. Anomalies related to the magnetic ordering established in both compounds were found. The main changes occur in the low-wavenumber region (up to 100 cm^–1), where the mode corresponding to magnon scattering arises. This mode is shown to have the internal structure indicative of the occurrence of unstable vibrations (40–80 cm^–1). The results obtained are analyzed by calculating the empirical lattice dynamics in Sm_1–<i>x</i>La_<i>x</i>Fe₃(BO₃)₄ with <i>x</i> = 0 and <i>x</i> = 1

MOESM3 of Specific features of l-histidine production by Escherichia coli concerned with feedback control of AICAR formation and inorganic phosphate/metal transport

Additional file 3: Figure S2. Effect of PitA deficiency on growth (a) and Pi uptake (b) during Pi starvation. (a) Growth of wild-type MG1655; MG1655 ∆pitA, MG1655 [ΔpitA::KmR], KF37; KF37 ∆pitA, KF37 [ΔpitA::KmR] strains. Growth of the KF37 His-producing strains was better during the initial period in MOPS medium, but the final optical density was the same as or lower than that of wild-type. The better initial growth of the KF37 strain can be explained by its effective sugar consumption, which was also monitored (data not shown) and was found to be exhausted at 17 h for the His-producing strain compared to 22 h for the wild-type strain (data not shown). These results confirm the measured kinetics of Pi uptake (b) from the medium; as expected, the rate of Pi uptake was higher for the His-producing strains under such conditions. Error bars show the standard deviation (SD)