New way to create high-speed LCDs based on the use of modified nanomaterials

Modified “detonation nanodiamond” (MDND), graphene oxide (MGO) and nanoclay (MNC) were doped to nematic (NLCs) and ferroelectric liquid crystals (FLCs). The effect of modified nanomaterials on the physical and electro-optical properties of liquid crystals was investigated

ОПТИЧЕСКИЕ СВОЙСТВА КОМПЛЕКСОВ УЛЬТРАДИСПЕРСНЫХ АЛМАЗОВ ДЕТОНАЦИОННОГО СИНТЕЗА С ИНДОТРИКАРБОЦИАНИНОВЫМ КРАСИТЕЛЕМ

A method to create complexes of detonation nanodiamonds with molecules of an indotricarbocyanine dye was developed. The process of complex formation was shown to depend on the nanodiamond annealing conditions. Nanodiamonds that were vacuum annealed at 750oC display the most effective interaction with the dye molecules. Formation of the complexes was studied with the aid of optical spectroscopy in the visible and infrared regions.Разработан метод получения комплексов ультрадисперсных алмазов детонационного синтеза с молекулами индотрикарбоцианинового красителя. Показано, что на процесс комплексообразования влияют условия термической обработки наноалмазов. Наиболее эффективное взаимодействие с красителем проявляется для ультрадисперсных алмазов, отожженных в вакууме при 750оС. Процесс образования комплексов изучен методом оптической спектроскопии в видимой и инфракрасной областях

Spectral properties of indotricarbocyanine dye in tissues of experimental animals

The paper presents the results of studies of the spectral properties of a photosensitizer based on indotricarbocyanine dye when accumulating in tissues of experimental animals. Using laser fluorescence spectroscopy, the in vivo and ex vivo fluorescence spectra of tissue-localized indotricarbocyanine dye were obtained for different time counts after intravenous administration. The profile of the pharmacokinetics of its accumulation and withdrawal was determined from the change in the intensity of fluorescence in the tumor and healthy muscle tissues of the photosensitizer. A monotonic deformation of its fluorescence spectrum was revealed in the tissues of tumor nodes and muscles of the thigh when registered through the skin over time after intravenous administration. The achievement of the maximum accumulation of the photosensitizer in the tumor correlates with the stabilization of the shape of its in vivo fluorescence spectrum. Thus, the maximum shift can be used as a diagnostic indicator of the maximum accumulation of indotricarbocyanine photosensitizer in the tumor tissues. The results were confirmed for two groups of animals: the first one – black mice of the C57Bl/6 line with an inoculated tumor of Clone M3 melanoma, the second – white mice of the ICR line with an inoculated tumor of Ehrlich ascites carcinoma. The analysis of the shape of the fluorescence spectrum of the photosensitizer during registration through the skin for animals with different colors has been carried out

Каталитические системы для реакций кросс-сочетания на основе модифицированных ультрадисперсных алмазов

Methods for preparation of nanocomposites of modified detonation nanodiamonds (DND) with metallic palladium have been developed and their catalytic activity in the Suzuki-Miyaura cross-coupling reaction in various reaction media has been studied. Methods for the regeneration of palladium-containing nanocomposites from the reaction mixture have been developed. The high catalytic activity of nanocomposites is confirmed by kinetic analysis based on the results of chromatographic analysis of the reaction mixture and is comparable to the literature data about similar catalytic systems. Regenerated nanocomposites showed the retention of catalytic activity for 3 consecutive cross-coupling cycles on model systems.Разработаны методы получения нанокомпозитов модифицированного ультрадисперсного алмаза детонационного синтеза с металлическим палладием и изучена их каталитическая активность в реакции кросс-сочетания Сузуки-Мияуры в различных реакционных средах. Исследованы методики регенерации палладийсодержащих нанокомпозитов из реакционной смеси. Каталитическая активность нанокомпозитов подтверждена исследованием кинетики реакции кросс-сочетания хроматографическим анализом реакционной смеси и сопоставима с уже используемыми подобными катализаторами. Регенерированные нанокомпозиты показали сохранение каталитической активности для 3 последовательных циклов кросс-сочетания на модельных системах

Спектральные свойства индотрикарбоцианинового красителя в тканях экспериментальных животных

The paper presents the results of studies of the spectral properties of a photosensitizer based on indotricarbocyanine dye when accumulating in tissues of experimental animals. Using laser fluorescence spectroscopy, the in vivo and ex vivo fluorescence spectra of tissue-localized indotricarbocyanine dye were obtained for different time counts after intravenous administration. The profile of the pharmacokinetics of its accumulation and withdrawal was determined from the change in the intensity of fluorescence in the tumor and healthy muscle tissues of the photosensitizer. A monotonic deformation of its fluorescence spectrum was revealed in the tissues of tumor nodes and muscles of the thigh when registered through the skin over time after intravenous administration. The achievement of the maximum accumulation of the photosensitizer in the tumor correlates with the stabilization of the shape of its in vivo fluorescence spectrum. Thus, the maximum shift can be used as a diagnostic indicator of the maximum accumulation of indotricarbocyanine photosensitizer in the tumor tissues. The results were confirmed for two groups of animals: the first one – black mice of the C57Bl/6 line with an inoculated tumor of Clone M3 melanoma, the second – white mice of the ICR line with an inoculated tumor of Ehrlich ascites carcinoma. The analysis of the shape of the fluorescence spectrum of the photosensitizer during registration through the skin for animals with different colors has been carried out.В работе приведены результаты исследований спектральных свойств фотосенсибилизатора на основе индотрикарбоцианинового красителя при накоплении в тканях экспериментальных животных. С помощью лазерной флуоресцентной спектроскопии получены спектры флуоресценции in vivo и ex vivo локализованного в тканях индотрикарбоцианинового красителя для разных временных отсчетов после внутривенного введения. По изменению интенсивности флуоресценции в опухолевой и здоровой мышечной тканях фотосенсибилизатора определен профиль фармакокинетики его накопления и вывода. Выявлена монотонная деформация его спектра флуоресценции в тканях опухолевых узлов и мышц бедра при регистрации через кожу с течением времени после внутривенного введения. Достижение максимального накопления фотосенсибилизатора в опухолевом узле коррелирует со стабилизацией формы его спектра флуоресценции in vivo. При этом смещение максимума может использоваться в качестве диагностического индикатора максимального накопления индотрикарбоцианинового фотосенсибилизатора в тканях опухолевых узлов. Результаты подтверждены для двух групп животных: первая – черные мыши линии C57Bl/6 с перевитой опухолью меланомы Clone M3, вторая – белые мыши линии ICR с перевитой опухолью асцитной карциномы Эрлиха. Проведен анализ формы спектра флуоресценции фотосенсибилизатора при регистрации через кожу для животных с разной окраской

Feasibility of Percutaneous Ultrasound Guided Intervention with Direct Access in Failing Infrainguinal Vein Bypass Grafts

Background: Patients with infrainguinal venous bypass grafts are at risk of graft stenosis leading to thrombosis and failure of the graft conduit. When primary assisted reintervention is needed, a common first choice of treatment is percutaneous angioplasty using fluoroscopy and digital subtraction angiography (DSA). We investigated whether percutaneous ultrasound-guided intervention (PUSGI) is feasible for such endovascular reinterventions. Methods: In this retrospective observational study (feasibility study), we included patients with ultrasound evidence of significant stenosis in below-the-knee vein grafts in the lower extremities. Inclusion period was 18 months. Reinterventions were disrupted by performing PUSGI in between traditional DSA. Perioperative success was defined as no sign of residual stenosis, stenosis at the access point in the vein, or need for further fluoroscopy guided intervention. Patient follow-up was conducted 6 weeks after the intervention. Patency of the procedure was defined as no disease recurrence or signs of ultrasonographic restenosis at follow-up. Results: PUSGI was performed in 17 patients referred for reintervention with imminent failing grafts (12 men, 5 women, age range 52–82 years). PUSGI alone was performed successfully in 10 out of 17 patients (59%). The remaining 7 patients underwent successful revascularization with PUSGI in combination with DSA-guided angioplasty. Periprocedural complications occurred in 4 patients. Two of 17 patients had occluded grafts at 6 weeks of follow-up. No PUSGI access site stenoses in grafts were observed. Conclusions: Percutaneous ultrasound-guided reintervention in peripheral vein bypass disease is feasible for selected patients. The study provides insight to qualitative criteria of eligibility for PUSGI in such reinterventions with direct conduit access.</p

Optical properties of the complexes of detonation nanodiamonds with an indotricarbocyanine dye

A method to create complexes of detonation nanodiamonds with molecules of an indotricarbocyanine dye was developed. The process of complex formation was shown to depend on the nanodiamond annealing conditions. Nanodiamonds that were vacuum annealed at 750oC display the most effective interaction with the dye molecules. Formation of the complexes was studied with the aid of optical spectroscopy in the visible and infrared regions