a-Hydrogen Exchange in the Re action of 2-Phenylethyldimethylsulphonium Ion with Base in Aqueous Solution and of 2-Phenylethyltrimethylammoni um Ion with Base in Aqueous and Alcoholic Solution

a-Hydrogen exch ange during the elimination from 2-phenylethyldimethylsulphonium bromide with on- in d euterium oxide h as been found to b e a lmost complete under certain r eactio n conditions. The product, trimethylamine, from the a n a logo u s reaction of 2-phenylethyltrimethylammonium iodide with eith er ethoxide ion in ethanol-0-d or with OD- in d~u terium oxide was found to contain no d etectabl e amount of deuterium above natural abundance

Influence of the Leather Industry on the Pollution of Coastal Sediments by Chromium in the Zadar Area (Eastern Adriatic)

U radu je ispitan utjecaj dugogodišnjeg ispuštanja neobrađenih otpadnih voda Tvornice kože Zadar na raspodjelu kroma u sedimentu uvale Brodanov jaz (Zadar, srednji Jadran). Ispitivanja su provedena na četiri lokacije duž uvale (ušće P1, početak P2, sredina P3 i kraj uvale P4), a za usporedbu uzet je i uzorak sedimenta na onečišćenoj lokaciji 20 km sjevernije od uvale Brodanov jaz, u Ninu (R). Određivan je maseni udjel kroma u 3 granulometrijske klase sedimenta (A: 0,063-2,0 mm, B: 0,010-0,063 mm, C: < 0,010 mm). Maseni udjel Cr u sedimentu na ušću (P1) znatno je veći (6 puta) nego maseni udjel kroma u sedimentu na kraju uvale (P4). Na ušću (P1) i početku uvale (P2) maseni udjel kroma je u prosjeku 25 puta veći nego na referentnoj lokaciji u Ninu (R). Maseni udjel kroma u svim uzorcima obrnuto je proporcionalan promjeru čestica sedimenta, tako da sitnije klase sedimenta (C i B) imaju u prosjeku oko 4 puta više kroma nego najkrupnija klasa (A) istih uzoraka. Dobivena raspodjela čestica ukazuje na to da su povećane količine kroma u sedimentu uvale Brodanov jaz antropogenog izvora, tj. da potječu iz Tvornice kože Zadar.The influence of the long term discharge of untreated wastewaters from the leather factory in Zadar on the distribution of chromium in the bay of Brodanov Jaz has been investigated in this study. The investigation was performed at four locations along the bay (at the mouth - P1, the beginning - P2, the middle - P3 and the end - P4 of the bay). A sediment sample was also taken at an unpolluted location near the town of Nin, 20 km to the north of the Brodanov Jaz bay, for the purpose of comparison. The chromium concentration was determined in 3 granulometric competition of the sediment (A: 0.063-2.00 mm, B: 0.010-0,063 mm, C:<0.010 mm). The highest concentracion of chromium was observed in the sediment taken nearest to the wastewater outlet. The concentration of Cr in the sediment at the mouth (P1) was considerably higher (6 times) than at the end of the bay (P4). At the mouth (P1) and at the beginning of the bay (P2) Cr concentration was about 25 times higher than at the reference location in Nin. Concentrations of Cr in all samples were inversely proportional to grain size, so the finest fractions of sediment (C and B) contained about 4 times higher Cr concentrations than in the large grain fraction (A) of the same samples. The obtained distribution of Cr in the bay of Brodanov Jaz indicates that the increased Cr concentrations in sediment came from the leather industry, and that they are of anthropogenic origin

Spatiotemporal profile of emission from oscillating dc micro discharges

The axial light distributions in parallel-plate dc microdischarges in argon show similar behavior to large scale discharges. Between the low-current Townsend mode and the high current glow mode exists a large region of currents where different oscillations appear and the dynamic Volt-Ampere characteristic shows hysteresis behavior. During the oscillations the maximum peak intensity moves closer to the cathode, which is characteristic for the abnormal glow regime even though the average current is considerably smaller.Comment: submitted to: IEEE Trans. Plasma Sci., Spec. Issue on Images in Plasma Sc

Effect of secondary emission on the afterglow of argon with negatively charged dust particles

A theoretical model for an argon/dusty plasma afterglow in presence of nano-sized dust particles with large density is developed. According to the model, in the plasma afterglow the electrons are generated in metastable collisions and in the secondary emission by collisions of ions with electrodes. By using the model and experimental time-dependencies for metastable density and electrode bias, the time-dependencies for electron density in argon/dusty plasma afterglow are calculated. The effect of secondary emission on electron generation in argon/dusty plasma afterglow is analyzed.Разработана теоретическая модель распадающейся пылевой аргоновой плазмы, которая имеет высокую плотность наноразмерных пылинок. Данная модель учитывает генерацию электронов при столкновениях метастабильных атомов между собой и благодаря вторичной эмиссии при столкновениях ионов с электродами. Используя эту модель и экспериментальные временные зависимости для плотности метастабильных атомов и потенциала электродов, рассчитаны временные зависимости для плотности электронов в пылевой распадающейся аргоновой плазме. Проанализировано влияние вторичной эмиссии на генерацию электронов в этой среде.Розроблено теоретичну модель пилової аргонової плазми, що розпадається, та має високу густину порошинок нанорозміру. Дана модель враховує генерацію електронів при зіткнені метастабільних атомів між собою та завдяки вторинній емісії при зіткнені іонів з електродами. Використовуючи цю модель та експериментальні часові залежності для густини метастабільних атомів та потенціалу електродів, розраховано часові залежності для густини електронів у запорошеній аргоновій плазмі, що розпадається. Проаналізовано вплив вторинної емісії на генерацію електронів у цьому середовищі

The effect of thermophoresis on the discharge parameters in complex plasma experiments

Thermophoresis is a tool often applied in complex plasma experiments. One of the usual stated benefits over other experimental tools is that changes induced by thermophoresis neither directly depend on, nor directly influence, the plasma parameters. From electronic data, plasma emission profiles in the sheath, and Langmuir probe data in the plasma bulk, we conclude that this assumption does not hold. An important effect on the levitation of dust particles in argon plasma is observed as well. The reason behind the changes in plasma parameters seems to be the change in neutral atom density accompanying the increased gas temperature while running at constant pressure.Comment: 14 pages, 12 figure

Axial light emission and Ar metastable densities in a parallel plate dc micro discharge in steady state and transient regimes

Axial emission profiles in a parallel plate dc micro discharge (feedgas: argon; discharge gap d=1mm; pressure p=10Torr) were studied by means of time resolved imaging with a fast ICCD camera. Additionally, volt-ampere (V-A) characteristics were recorded and Ar* metastable densities were measured by tunable diode laser absorption spectroscopy (TDLAS). Axial emission profiles in the steady state regime are similar to corresponding profiles in standard size discharges (d=1cm, p=1Torr). For some discharge conditions relaxation oscillations are present when the micro discharge switches periodically between low current Townsend-like mode and normal glow. At the same time the axial emission profile shows transient behavior, starting with peak distribution at the anode, which gradually moves towards the cathode during the normal glow. The development of argon metastable densities highly correlates with the oscillating discharge current. Gas temperatures in the low current Townsend-like mode (T= 320-400K) and the high current glow mode (T=469-526K) were determined by the broadening of the recorded spectral profiles as a function of the discharge current.Comment: submitted to Plasma Sources Sci. Techno

Amorphous carbon film deposition on inner surface of tubes using atmospheric pressure pulsed filamentary plasma source

Uniform amorphous carbon film is deposited on the inner surface of quartz tube having the inner diameter of 6 mm and the outer diameter of 8 mm. A pulsed filamentary plasma source is used for the deposition. Long plasma filaments (~ 140 mm) as a positive discharge are generated inside the tube in argon with methane admixture. FTIR-ATR, XRD, SEM, LSM and XPS analyses give the conclusion that deposited film is amorphous composed of non-hydrogenated sp2 carbon and hydrogenated sp3 carbon. Plasma is characterized using optical emission spectroscopy, voltage-current measurement, microphotography and numerical simulation. On the basis of observed plasma parameters, the kinetics of the film deposition process is discussed

A novel Tc 99m sorbent based on macroporous magnetic polymer

A novel magnetic macroporous poly(glycidyl-co-ethylene glycol dimethacrylate) (mPGME) synthesized by suspension copolymerization and functionalized with diethylene triamine (mPGME-deta) was evaluated as sorbent for pertechnetate ion (TcO4 - ) removal from aqueous solutions. Atomic force microscopy (AFM) was used for characterization. The kinetics of TcO4 - adsorption onto mPGME-deta is relatively fast and depends on pH.Physical chemistry 2016 : 13th international conference on fundamental and applied aspects of physical chemistry; Belgrade (Serbia); 26-30 September 201

Transient bacteremia caused by Atopobium vaginae after caesarean delivery: Case report

Introduction: Genital microbiome of woman is still a puzzle to this day. It consists of a large number of different bacterial species and phenotypes that make up the normal genital flora, while in the cases of its change there is a predominance of certain, especially anaerobic species, which is the case with bacterial vaginosis. These types are mostly rare causing invasive infections, but under certain conditions can lead to severe infections, such as multiple parts of the genital tract, and to an unwanted outcome in the pregnancy. Case report: This paper presents an extremely rare case of transient bacteremia caused by Atopobium vaginae type in a patient following a cesarean section where empirical therapy gave a positive effect and the patient recovered and released home with healthy newborn. Conclusions: During the clinical work it is important to be aware of the different anaerobic species present in the genital tract of women microbiome like Atopobium vaginae and should adjust the empirical therapy, which was the case here

Intraparticle diffusion and adsorption of heavy metals onto porous polymer

Intraparticle diffusion kinetic model (IPD) was used to elucidate the influence of macroporous glycidyl methacrylate (GMA) and ethylene glycol dimethacrylate (EGDMA) copolymer (PGME) with attached diethylene triamine (PGME-deta) on the competitive Cu(II), Cd(II), Co(II) and Ni(II) ions sorption from aqueous solutions. Surface sorption was examined by SEM-EDS analysis.Physical chemistry 2016 : 13th international conference on fundamental and applied aspects of physical chemistry; Belgrade (Serbia); 26-30 September 201