In the present paper a number of difficult passages in the poems of Catullus are discussed:
1.9; 2.8; 4.23; 6.12/17; 10.9; 32.9–11; 36.9; 38.7s; 44.19/21; 54; 55. 13–22; 58b; 64. 219; 65. 5/8; 6.28/74; 67.1; 68.85; 80.8; 84.5; 100.6; 107.3; 110.7; 111.2; 113.7s.
Authors:Bojan Pavlović, Dragana D. Božić, Jovica Milovanović, Ana Jotić, Vojko Djukić, Slobodanka Djukić, Neda Konstantinović, and Ivana Ćirković
biofilm on SS (category 2, ++) compared with non-multidrug resistant strains (category 1, +) ( p < 0.05; Table I , Figure 1b ). One (6.7%) S. aureus strain resistant to penicillin, ampicillin, and tetracycline, and three (20.0%) M. catarrhalis
Authors:Bo-chao Xu, W. Burnett, Derek Lane-Smith, and Zhi-gang Yu
Measurements of 222Rn (“radon”) in the environment are important in the geosciences and radiation-protection fields. We demonstrate here a simple
laboratory-based calibration system to evaluate the efficiency of radon detectors with a reproducibility of about ±2%. The
system uses a closed-loop air circulation design with 226Ra adsorbed onto MnO2-impregnated fiber as a radon source. Two RAD7 radon detectors (Durridge Co., Inc.) that were precisely calibrated at Durridge’s
in-house calibration facility are used as secondary standards. By parallel analysis of the radon-enriched air within the closed
loop, the test RAD7s are assigned a calibration coefficient to be applied to future measurements. We also performed a side-by-side
intercomparison with two RAD7s in a high-radon natural environmental setting (limestone cave in Florida) that produced comparable
Sulfite and SeS2O
in acidic solutions to selenium. Selenandisulfonates are observed as intermediate products. They are separated by high voltage
paper ionophoresis in acidic basis electrolytes and identified on the paper by application of35S- and75Se-labelled compounds. The formation of selenandisulfonates depends on thepH of the solution. In neutral systems species exist with up to 4 Seatoms in the chain, in acidic solutions species with up
to 7 Se-atoms in the chain are found. Se7S2O
has been detected for the first time. Selenium precipitates by the decomposition of the selenandisulfonates with the longest
Nickel sulphide (NiS) was characterised using X-ray diffraction, thermal gravimetric analysis (TG) and differential scanning
calorimetry (DSC). The 'as received' Millerite, stoichiometric NiS, observed to be slightly nickel deficient, was found to
readily decompose in a nitrogen atmosphere at elevated temperatures (450C max.) to the sulphur deficient Godlevskite, Ni7S6. DSC and X-ray measurements demonstrated that the high temperature form of the Godlevskite was readily stabilised at room
temperature. The kinetics of the α-β re-transformation in Godlevskite were then investigated using DSC and were observed to
be first order.
<a name="abs1"/>Abstract??The high temperature sulfation of CaO with SO2was investigated under vacuum by TG. Experimental data indicated that the sulfation process was a two-stage reaction, a very fast surface reaction in the beginning, and followed by a product-layer diffusion-controlled reaction. The initial period was about 7 s. This process of sulfation was affected by type of limestone, micro structure, particle size and temperature, but hardly affected by SO2concentration. A 59% CaO conversion can be achieved in 30 s at 1000?C and 1 mbar.
Using 224Ra radiotracer the first hydrolysis constant (pK1h) of Ra2+ cations has been determined. The pK1h value of Ra2+ was compared with the pK1h values of other Group 2 cations. It has been shown that the electrostatic hydrolysis model based on assumption that pK1h is a linear function of reciprocal ionic radii (1/ri) does not describe well the hydrolysis of Group 2 metal cations. The reason of higher Ra2+ hydrolysis as expected is the influence of relativistic effects on bonding 7s and 7p1/2 orbitals.
Oxo-centered mixed-valence trinuclear iron dicarboxylic acid complex iron fumarate [Fe3O(O2CCH=CHCO2)3(H2O)3]·nH2O (n = 18-19), have been synthesized firstly. Variable temperature Mössbauer spectroscopy has been carried out to elucidate the rate of intramolecular electron transfer. It was found that the complex showed a temperature dependent mixed-valence state. At low temperature two quadrupole split doublets were observed corresponding to high spin Fe(III) and high spin Fe(II) state and a complete averaged valence state was observed at about 270 K. At temperatures between 200 and 270 K the spectra showed relaxation effect as the electron transfer rate was comparable to the Mössbauer timescale (-10–7 s).
The terpenes α-(+)-pinene, and α-(−)pinene have been radiolyzed at radiation doses of 150, 300 and 600 kGy. The radiolyzed
samples have been analyzed by FT-IR spectroscopy and polarimetry. Both α-(+)-, α-(−)-pinenes show a linear trend to radioracemization
as a function of the radiation dose administered ≈2.5·10−3 [α]D/kGy. The solvent fractionation and the liquid chromatographic analysis (HPLC) of the radiolyzed samples shows that both α-pinene
enantiomers produce ocimene and dipentene together with minor quantities of other products and a resin. The kinetics of α-pinene
decomposition under radiolytic conditions can be described by a pseudofirst order rate constant k∼5.3·10−7s−1 while the radiation chemical yield for the same reaction has a G = 5.0 molecules/100 eV, so that about 30% of the original α-pinene is converted into other products at 600 kGy.