Synthesis of 2-Substituted Benzthiazoles as Tetramisole Analogs

Zusammenfassung Es wurde eine Reihe 2-substituierter Benzthiazole (3–11) als Analoge des 6-Phenyl-2,3,5,6-tetrahydroimidazo[2,1-b]thiazols (Tetramisol) synthetisiert. Alle dargestellten Verbindungen wurden auf ihre anthelmintische Wirkung überprüft, wobei allerdings keine nennenswerte Aktivität festzustellen war.

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A number of 2-substituted benzthiazoles (3–11) have been synthesized as analogs of 6-phenyl-2,3,5,6-tetrahydroimidazo[2,1-b]thiazole (tetramisole). All the compounds were tested against two intestinal nematodes in rats and hamsters but none showed any noteworthy activity.

Communication No. 2845 from C.D.R.I., Lucknow, India.     

Analysis of lattice thermal conductivities of rare-earth sulphides at high temperatures

The lattice thermal conductivities of rare-earth sulphides have been analyzed at high temperatures in the frame of the two-mode conduction of phonons for the first time by studying the total lattice thermal conductivities of GdS and LaS in the entire temperature range 100–1000 K. The temperature exponents for the three-phonon scattering relaxation rates are reported for the transverse as well as for the longitudinal phonons. The separate percentage contributions due to the transverse and longitudinal phonons towards the total lattice thermal conductivities of the above samples have similarly been studied. The role of the four-phonon processes too has been included in the present investigation.     

A ratio derivative spectrophotometric method for the simultaneous determination of uranium and plutonium

A ratio derivative spectrophotometric method has been developed for the simultaneous determination of uranium and plutonium at mg levels in 1M HNO₃ medium. In this method the overlapping spectra of uranium and plutonium are well resolved by making use of the first derivative of the ratios of their direct absorption spectra. The derivative ratio absorbances of uranium and plutonium are measured at 411.2 and 473.8 nm, respectively for their quantification. The method is simple, fast and does not require separation of uranium and plutonium. Another salient feature of the method is that it does not lead to generation of analytical waste thereby minimising the efforts required for the recovery of plutonium. Uranium in the conc. range of 10–25 mg/g and plutonium in the conc. range of 0.5 to 2 mg/g (U/Pu ratio varying from about 10 to 25) were determined in the same aliquot with a precision and accuracy of about 0.5% and 1%, respectively.     

Effect of temperature on the ML of Au doped(Zn,Cd)S mixed phosphors

In this paper the effect of temperature on the mechanoluminescence of Au doped phosphors of(Zn,Cd)S is described.It is found that the ML disappears beyond a particular temperature.The temperature dependence of ML intensity follows the relation I =I_T~O(1-TIT_C)~n,where I_T~O is a constant,n is the slop of log I_T versus log(1- TIT_C) plot which lies between 0.9 and 1.10,T_C is the temperature at which ML disappear.It is found that the ML intensity in(Zn,Cd)S:Au disappear at 600 K.     

Phase transition properties of 3D Potts models

Using multicanonical Metropolis simulations we estimate phase transition properties of 3D Potts models for q=4 to 10: The transition temperatures, latent heats, entropy gaps, normalized entropies at the disordered and ordered endpoints, interfacial tensions, and spinodal endpoints.     

Specific features of steady-state implantation of crystalline silicon with a molecular oxygen-nitrogen beam: Si <Emphasis Type="Italic">L</Emphasis><Subscript>2, 3</Subscript> x-ray emission spectra

The local electronic structure of 〈111〉 n-silicon single-crystal samples is studied using Si L _{2, 3} x-ray emission spectroscopy. The Si _x O _y N _z system is formed by implanting the samples with an ¹⁶O ₂ ⁺ and ¹⁴N ₂ ⁺ ion molecular beam (the oxygen/nitrogen ratio in the molecular beam is 1:1, the implantation energy is 30 keV, the irradiation fluences vary from 2.0 × 10¹⁷ to 1.5 × 10¹⁸ cm^?2, the samples after the implantation are subjected to rapid thermal annealing in nitrogen at 800°C for 5 min). A comparison of the recorded Si L spectra with the spectra of the reference samples reveals clear correlations between the specific features of the electronic structure of the silicon oxynitride formed upon implantation and the ion fluence. It is shown that the implantation at fluences of 2 × 10¹⁷ and 1 × 10¹⁸ cm^?2 results in the predominant formation of Si₃N₄, whereas the implantation at a fluence of 1.5 × 10¹⁸ cm^?2 leads primarily to the formation of SiO₂ layers in single-crystal silicon. The most probable factors and mechanisms accounting for such implantation of ¹⁶O ₂ ⁺ and ¹⁴N ₂ ⁺ into the samples under study are discussed. The experimental data obtained are compared with ab initio full-potential linearized augmented plane wave calculations of the band structure.     

Suppression of high-p{T} neutral pion production in central Pb+Pb collisions at sqrt[S{NN}]=17.3 GeV relative to p+C and p+Pb collisions

Neutral pion transverse momentum spectra were measured in p+C and p+Pb collisions at sqrt[S{NN}]=17.4 GeV at midrapidity (2.3 less than or approximately equal eta{lab} less than or approximately equal 3.0) over the range 0.7 less than or approximately equal p{T} less than or approximately equal 3.5 GeV/c. The spectra are compared to pi{0} spectra measured in Pb+Pb collisions at sqrt[S{NN}]=17.3 GeV in the same experiment. For a wide range of Pb+Pb centralities (N{part} less than or approximately equal 300), the yield of pi{0}'s with p{T} greater than or approximately equal 2 GeV/c is larger than or consistent with the p+C or p+Pb yields scaled with the number of nucleon-nucleon collisions (N{coll}), while for central Pb+Pb collisions with N{part}greater than or approximately equal 350, the pi{0} yield is suppressed.     

Finite volume Kolmogorov-Johnson-Mehl-Avrami theory

We study the Kolmogorov-Johnson-Mehl-Avrami theory of phase conversion in finite volumes. For the conversion time we find the relationship tau(con)=tau(nu)[1+f(d)(q)]. Here d is the space dimension, tau(nu) the nucleation time in the volume V, and f(d)(q) a scaling function. Its dimensionless argument is q=tau(ex)/tau(nu), where tau(ex) is an expansion time, defined to be proportional to the diameter of the volume divided by expansion speed. We calculate f(d)(q) in one, two, and three dimensions. The often considered limits of phase conversion via either nucleation or spinodal decomposition are found to be volume-size dependent concepts, governed by simple power laws for f(d)(q).