Regularities of filtration of sunflower oil with the use of vibroacoustic exposure

The residue in sunflower oil is a dispersed phase consisting of particulate products grinding sunflower seeds in the form of particles of the pulp, oil cake, meal, residual quantities of metals, pesticides. In the recycling process they are in the oil in suspension and negatively affect its quality. For research an experimental setup was developed allowing to change the angle of inclination of the filter element. The regularities of filtration were determined without preliminary purification of sunflower oil by centrifugation and after centrifugation. It is established, the contamination of centrifuged oil in the initial period is 14.6 times lower. After 10 minutes of treatment, it decreases by 62%, after 20 minutes – by 79.4%. With a 30-minute treatment, particles of 0.005-0.1 mm in size are removed to 90%, which is approximated to the refined oil in terms of contamination. The influence of vibration-acoustic action on sunflower oil during its filtration is shown. At the last stage of production, the peroxide index is reduced to 2-3 moles of active oxygen, and after 3 months of storage – from 11.8 to 7.7, which according to GOST corresponds to the highest-grade oil. The regularities of the filtration without pre-treatment of sunflower oil by centrifugation and after centrifugation. Shows the effect of vibroacoustic exposure on sunflower oil when filtering. The obtained data on the change of qualitative parameters of sunflower oil during its filtration in the field of vibroacoustic impact

ВЛИЯНИЕ ЛАЗЕРНОГО ИЗЛУЧЕНИЯ ДЛИНОЙ ВОЛНЫ 662 НМ НА РОСТ MYCOBACTERIUM TUBERCULOSIS IN VITRO

Goal of the study: to define the effect of various doses of laser radiation with 662 nm wave on the growth of M. tuberculosis in vitro.Materials and methods. Samples of mycobacterial suspension of M. tuberculosis H37Rv were processed by monopositional light radiation (λ = 662 nm) in six dosing regimens varying in power and duration of the exposure to the light. All samples of mycobacterial suspension of M. tuberculosis were inoculated on the solid nutritional media of Lowenstein-Jensen in triplets for each dose of the exposure to light. Cultures were incubated under 37°С for 90 days with weekly inspection of samples.Results. Continuous irradiation by diffused laser with 662 nm wave provides the most expressed bacteriostatic and bactericidal effects against M. tuberculosis H37Rv under the density of the energy dose of 234.5 and 703.5 of J/sq.cm. Such a dose was obtained through 5 and 15-minute exposure respectively. Цель исследования: установить in vitro влияние различных доз лазерного излучения длиной волны 662 нм на ростовые свойства M. tuberculosis.Материалы и методы. Воздействие на образцы микобактериальной взвеси M. tuberculosis H37Rv осуществляли непрерывным монопозиционным световым излучением (λ = 662 нм) в шести режимах дозирования, зависящих от мощности и длительности светового воздействия. Инокуляция всех образцов суспензий микобактерий туберкулеза осуществлялась на плотные питательные среды Левенштейна – Йенсена в триплетах для каждой дозы светового воздействия. Инкубация посевов осуществлялась при 37°С в течение 90 дней с еженедельным пересмотром образцов.Результаты. Непрерывное излучение полупроводникового лазера с длиной волны 662 нм обладает наиболее выраженными бактериостатическими и бактерицидными эффектами в отношении M. tuberculosis H37Rv при плотности дозы энергии 234,5 и 703,5 Дж/см2 . Такая доза была получена при 5- и 15-минутной экспозиции соответственно.

Enantioselective component selection in multicomponent supramolecular gels

We investigate a two-component acid-amine gelation system in which chirality plays a vital role. A carboxylic acid based on a second generation l-lysine dendron interacts with chiral amines and subsequently assembles into supramolecular gel fibers. The chirality of the amine controls the assembly of the resulting diastereomeric complexes, even if this chirality is relatively "poor quality". Importantly, the selective incorporation of one enantiomer of an amine over the other into the gel network has been demonstrated, with the R amine that forms complexes which assemble into the most stable gel being primarily selected for incorporation. Thermodynamic control has been proven by forming a gel exclusively with an S amine, allowing the R enantiomer to diffuse through the gel network, and displacing it from the "solidlike" fibers, demonstrating that these gels adapt and evolve in response to chemical stimuli to which they are exposed. Excess amine, which remains unincorporated within the solidlike gel fiber network, can diffuse out and be reacted with an isocyanate, allowing us to quantify the enantioselectivity of component selection but also demonstrating how gels can act as selective reservoirs of potential reagents, releasing them on demand to undergo further reactions; hence, component-selective gel assembly can be coupled with controlled reactivity