This is the first study demonstrating that ortho-phthalic acid esters, dibutylphthalate (DBP) and di-(2-ethylhexyl)-o-phthalate (DEHP), inhibit the ability to form biofilms of the biotrophic pathogen Clavibacter michiganensis ssp. sepedonicus and Pectobacterium carotovorum ssp. carotovorum necrotroph. Inhibition of biofilm formation depends on the DBP and DEHP concentrations.
Eudialyte-group minerals are of scientific interest as important concentrators of rare elements (mainly Zr and REE) in agpaitic alkaline rocks and a potential source of REE, Zr, Hf, Nb, and Ta for industrial use. Extraction of uranium(VI), thorium(IV), zirconium(IV), hafnium(IV), titanium(IV), and scandium(III) by a binary extractant based on 1,5-bis[2-(hydroxyethoxyphosphoryl)-4-ethylphenoxy]-3-oxapentane and methyl trioctylammonium nitrate from eudialyte breakdown solutions is studied. Extraction isotherms were obtained and exhaustive extraction was investigated. It is shown that uranium, thorium, hafnium, zirconium, scandium, and titanium are almost completely recovered in two-stage extraction by a mixture of 1,5-bis[2-(hydroxyethoxyphosphoryl)-4-ethylphenoxy]-3-oxapentane and methyltrioctylammonium nitrate in 1,2-dichloroethane. Quantitative characteristics were compared for uranium(VI), thorium(IV), zirconium(IV), hafnium(IV), titanium(IV), and scandium(III). It was shown that the extraction efficiency of the metals by the binary extractant based on 1,5-bis[2-(hydroxyethoxyphosphoryl)-4-ethylphenoxy]-3-oxapentane and methyltrioctylammonium nitrate in 1,2-dichloroethane is much higher in comparison with the commercially available tributyl phosphate.
Optically active bis-2R(-)ethylhexyl o-phthalate was obtained with 0.18% yield from dry cultured cells of Aconitum baicalense Turcz ex Rapaics 1907 by extraction with petroleum ether followed by silica gel column chromatography. Its structure was confirmed by the analysis of C andH NMR spectra. Seasonal fluctuations of quantitative phthalate content in A. baicalense cells were identified. The tests were performed under conditions excluding the presence of phthalates in reagents, materials, and laboratory dishes. The same substance was shown to be produced by cultivated cells of other plants. Biosynthesis of esters of ortho-phthalic acid by cultivated plant cells was discovered for the first time.
Уфимский государственный нефтяной технический университет генеральный директор А. А. Маляренко, ООО НПФ «СКАД Софт» ассистент И. А. Порываев, ассистент М. Н. Сафиуллин, Уфимский государственный нефтяной технический университет Аннотация. В статье рассмотрены результаты численных исследований болтов фланцевого монтажного стыка фермы из гнутых сварных замкнутых профилей. Обоснован выбор расчетной модели соединения в среде ПК SCAD. Выполнен расчет в геометрически нелинейной постановке. Получен характер изменения напряженно-деформированного состояния болтов на различных этапах нагружения. Проведено сравнение результатов численных исследований моделей в ПК SCAD с результатами, полученными классическими методами в программе ANSYS. Показан пространственный характер работы соединения. Выполнена оценка влияния изгибающих моментов на напряженно-деформированное состояние болтов. Обоснована необходимость учета изгибающих моментов, а также соотношения жесткостей отдельных элементов монтажного стыка (соединяемые профили, подкрепляющие ребра, фланцы) при определении несущей способности высокопрочных болтов. Полученные результаты могут быть использованы при проектировании и обследовании монтажных фланцевых стыков, работающих на растяжение. Ключевые слова: болтовое фланцевое соединение; метод конечных элементов; аналитическое исследование; анализ напряжений
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