Excess Molar Volume of Binary Systems Containing Mesitylene

This paper presents a review of density measurements for binary systems containing 1,3,5-trimethylbenzene (mesitylene) with a variety of organic compounds at atmospheric pressure. Literature data of the binary systems were divided into nine basic groups by the type of contained organic compound with mesitylene. The excess molar volumes calculated from the experimental density values have been compared with literature data. Densities were measured by a few experimental methods, namely using a pycnometer, a dilatometer or a commercial apparatus. The overview of the experimental data and shape of the excess molar volume curve versus mole fraction is presented in this paper. The excess molar volumes were correlated by Redlich–Kister equation. The standard deviations for fitting of excess molar volume versus mole fraction are compared. Found literature data cover a huge temperature range from (288.15 to 343.15) K

Ekscesni molarni obujam binarnih sustava koji sadrže mezitilen

This paper presents a review of density measurements for binary systems containing 1,3,5-trimethylbenzene (mesitylene) with a variety of organic compounds at atmospheric pressure. Literature data of the binary systems were divided into nine basic groups by the type of contained organic compound with mesitylene. The excess molar volumes calculated from the experimental density values have been compared with literature data. Densities were measured by a few experimental methods, namely using a pycnometer, a dilatometer or a commercial apparatus. The overview of the experimental data and shape of the excess molar volume curve versus mole fraction is presented in this paper. The excess molar volumes were correlated by Redlich–Kister equation. The standard deviations for fitting of excess molar volume versus mole fraction are compared. Found literature data cover a huge temperature range from (288.15 to 343.15) K.U ovom je radu dan pregled izmjerenih gustoća binarnih sustava koji sadre 1,3,5-trimetilben-zen (mezitilen) s različitim organskim spojevima pri atmosferskom tlaku. Literaturni podaci o binarnim sustavima razvrstani su u devet osnovnih skupina prema vrsti organskog spoja u smjesi s mezitilenom. Ekscesni molarni obujmi izračunati su iz eksperimentalno određenih vrijednosti gustoće i uspoređeni s literaturnim podacima. Gustoće su izmjerene pomoću nekoliko eksperimentalnih metoda: piknometrom, dilatometrom ili nekom od komercijalnih aparatura. Prikazani su eksperimentalni podaci i oblik krivulje ekscesnog molarnog obujma u ovisnosti o molnom udjelu. Procijenjene vrijednosti ekscesnih molarnih obujama u ovisnosti o molnom udjelu korelirane su Redlich-Kisterovom jednadžbom, a prikladnost odabrane funkcije izražena je usporedbom standardnih devijacija. Literaturni podaci pokrivaju široko temperaturno područje (od 288,15 do 343,15 K).</p

Properties of TIO.sub.x./sub. films deposited at atmosphere pressure

TiOx films were deposited on silica glass by RF discharge in atmosphere pressure at low substrate temperature. Some properties of the films were studied depending on annealing temperature after deposition. The thickness, nanohardness, crystallinity and speed of photocatalysis degradation were investigated

Investigation of thin films deposition into porous material

Although the direct contact of the treated material with the plasma is assumed by the plasma community as a necessary condition of successful plasma treatment, several references mention penetration of active species into the porous material. Hydrophylity enhancement has been observed even inside porous material. The aim of this study is experimental investigation of plasma. This work is aimed to experimental investigation of thin layers deposition on porous substrates. The porous substrate was simulated with a specimen made from two glass wafers, on the margins of which two difference strips of varying thickness were placed. These strips define the thickness of the slot in the middle. After the deposition the substrate was decomposed and the film deposited inner walls of the glass wafers was investigated. Layers were deposited by method PECVD used RF plasma from gas C2H2. The film thickness was measured in dependence on the distance from the margin into the centre of the slab by optical profilometer. Penetration dept was tested in dependence on deposition conditions and geometric configuration of the substrate. Depending on deposition conditions, the film deposition was observed even on the whole substrate

Magnetocaloric Study of S=1/2 Low-Dimensional Heisenberg Antiferromagnet [Cu(phen)(H2O)2]SO4[Cu\text{(phen)}(H_2O)_2]SO_4

We present the experimental study of magnetocaloric effect on powder sample $[Cu\text{(phen)}(H_2O)_2]SO_4$ (phen = phenantroline = $C_{12}H_8N_2$) in the temperature range from nominally 0.2 K to 4 K and in magnetic fields up to 2 T. The values of total entropy were extracted from the experimental data obtained by adiabatic demagnetization. The comparison was performed with the temperature dependence of the entropy for S=1/2 paramagnet calculated at selected magnetic fields. The deviations observed below 0.6 T were attributed to internal field mediated by exchange coupling. In addition, the temperature response observed in $[Cu\text{(phen)}(H_2O)_2]SO_4$ revealed very short relaxation time below 1 K. The comparison of the behavior observed at the end of the demagnetization in $[Cu\text{(phen)}(H_2O)_2]SO_4$ and other systems suggests that the magnetocaloric effect can serve as an alternative tool for studying slow magnetic relaxation

Effect of angiotensin-converting enzyme blockade, alone or combined with blockade of soluble epoxide hydrolase, on the course of congestive heart failure and occurrence of renal dysfunction in Ren-2 transgenic hypertensive rats with aorto-caval fistula.

We showed recently that increasing kidney epoxyeicosatrienoic acids (EETs) by blocking soluble epoxide hydrolase (sEH), an enzyme responsible for EETs degradation, retarded the development of renal dysfunction and progression of aorto-caval fistula(ACF)-induced congestive heart failure (CHF) in Ren-2 transgenic hypertensive rats (TGR). In that study the final survival rate of untreated ACF TGR was only 14 % but increased to 41 % after sEH blockade. Here we examined if sEH inhibition added to renin-angiotensin system (RAS) blockade would further enhance protection against ACF-induced CHF in TGR. The treatment regimens were started one week after ACF creation and the follow-up period was 50 weeks. RAS was blocked using angiotensin-converting enzyme inhibitor (ACEi, trandolapril, 6 mg/l) and sEH with an sEH inhibitor (sEHi, c-AUCB, 3 mg/l). Renal hemodynamics and excretory function were determined two weeks post-ACF, just before the onset of decompensated phase of CHF. 29 weeks post-ACF no untreated animal survived. ACEi treatment greatly improved the survival rate, to 84 % at the end of study. Surprisingly, combined treatment with ACEi and sEHi worsened the rate (53 %). Untreated ACF TGR exhibited marked impairment of renal function and the treatment with ACEi alone or combined with sEH inhibition did not prevent it. In conclusion, addition of sEHi to ACEi treatment does not provide better protection against CHF progression and does not increase the survival rate in ACF TGR: indeed, the rate decreases significantly. Thus, combined treatment with sEHi and ACEi is not a promising approach to further attenuate renal dysfunction and retard progression of CHF

Metal-containing landfills as a source of antibiotic tolerance

To unveil the potential effect of metal presence to antibiotic tolerance proliferation, four sites of surface landfills containing tailings from metal processing in Slovakia (Hnusta, Hodrusa, Kosice) and Poland (Tarnowskie Gory) were investigated. Tolerance and multitolerance to selected metals (Cu, Ni, Pb, Fe, Zn, Cd) and antibiotics (ampicillin, tetracycline, chloramphenicol, and kanamycin) and interrelationships between them were evaluated. A low bacterial diversity (Shannon-Wiener index from 0.83 to 2.263) was detected in all sampling sites. Gram-positive bacteria, mostly belonging to the phylum Actinobacteria, dominated in three of the four sampling sites. The recorded percentages of tolerant bacterial isolates varied considerably for antibiotics and metals from 0 to 57% and 0.8 to 47%, respectively, among the sampling sites. Tolerances to chloramphenicol (45-57%) and kanamycin (32-45%) were found in three sites. Multitolerance to several metals and antibiotics in the range of 24 to 48% was recorded for three sites. A significant positive correlation (p < 0.05) for the co-occurrence of tolerance to each studied metal and at least one of the antibiotics was observed. Exposure time to the metal (landfill duration) was an important factor for the development of metal-as well as antibiotic-tolerant isolates. The results show that metal-contaminated sites represent a significant threat for human health not only for their toxic effects but also for their pressure to antibiotic tolerance spread in the environment.Web of Science1952art. no. 26