[en] Short communication

[en] Using the quantum molecular dynamics approach, we analyzed the results of the recent INDRA Collaboration Au+Au experiments at GSI in the energy range between 60A and 150A MeV. It turns out that in this energy region, the transition toward a participant-spectator scenario takes place. The large Au+Au system displays, in the simulations as in the experiment, simultaneously dynamical and statistical behavior, which we analyze in detail. The composition of fragments close to midrapidity follows statistical laws, and the system shows bimodality, i.e., a sudden transition between different fragmentation patterns, as a function of centrality, as expected for a phase transition. The fragment spectra at small and large rapidities, on the other hand, are determined by dynamics, and the system as a whole does not come to equilibrium--an observation that is confirmed by FOPI Collaboration experiments for the same system

[en] Rapid growth in implant applications in the fabrication of semiconductors has encouraged a dramatic increase in the range of energies, beam currents and ion species used. The challenges of a wider energy range, higher beam currents, continued reduction in contamination, improved angle integrity and larger substrates have motivated the development of many innovations. Advanced processes in submicron device production uses up to twenty implantation steps. Thus the outstanding growth of this industry has led to the evolution of a thriving business of hundreds of implantation equipment systems each year with very specific requirements. The present paper reviews the principal process requirements which resulted in the evolution of the equipment technology, and describes the recent trends in the ion implanter technology all three principal categories: high current, medium current and high energy. (author)

[en] More exact and reliable masses of stable isotopes of Zn, Ga, Ge, As, and Se are determined. As substandard elements, the masses of ¹H, ¹³C, ¹⁴N, ¹⁶O, ³²S, and ³⁵Cl are used. The present data are given in the M(¹²C)=12.000000 scale. For the measurement of mass of each nuclide various organic compounds and their fragments have been employed. All the possible ''isotopic'' doublets have been measured. All in all, 158 of the main doublets have been measured and, taking advantage of them, the masses have been determined for 19 stable isotopes: sup(64,66,67,68,70)Zn, sup(69,71)Ga, sup(70,72,73,74,76)Ge, ⁷⁵As, and sup(74,76,77,78,80,82)Se. As the error of mass measurement the value 8x10^-6 atom units has been adopted. All the ground and ''isotopic'' doublets measured and isotopic masses derived from each doublet are presented in a table. The other table lists average mass values, which have been calculated with the allowance for the ''weight'' of the measurements. The same table gives for comparison the most recent experimental mass-spectroscopic data for the range of nuclei under consideration

[en] Short communication

[en] A heavy-fermion compound with very low carrier concentration, Yb₄As₃, was investigated with the ⁷⁵As nuclear quadrupole resonance (NQR) technique between 2 and 200 K. The spin lattice relaxation rate, 1/T₁, follows the T₁T=constant law in the very narrow temperature range between 10 and 20 K and becomes almost independent of temperature below 4 K, which suggests that the ground-state properties of Yb₄As₃ are not so simple to be described by the Fermi liquid picture. (orig.)

[en] The miR-92a family, including miR-25, miR-92a-1, miR-92a-2 and miR-363, arises from three different paralog clusters miR-17-92, miR-106a-363, and miR-106b-25 that are highly conservative in the process of evolution, and it was thought as a group of microRNAs (miRNAs) correlated with endothelial cells. Aberrant expression of miR-92a family was detected in multiple cancers, and the disturbance of miR-92a family was related with tumorigenesis and tumor development. In this review, the progress on the relationship between miR-92a family and their target genes and malignant tumors will be summarized. - Highlights: • Aberrant expression of miR-92a, miR-25 and miR-363 can be observed in many kinds of malignant tumors. • The expression of miR-92a family is regulated by LOH, epigenetic alteration, transcriptional factors such as SP1, MYC, E2F, wild-type p53 etc. • Roles of miR-92a family in tumorigenesis and development: promoting cell proliferation, invasion and metastasis, inhibiting cell apoptosis

[en] Published in summary form only

[en] Based on in-beam γ- and electron-spectroscopic measurements, a new level scheme is proposed for ⁷³As up to 1.4 MeV excitation energy, spins and parities of the levels are deduced. (author)

[en] The arsenate (and phosphate) sorbing properties of the various components in the clay fractions of several acidic soils were assessed by autoradiography using radioactive arsenate-73. Arsenate uptake from solution was recognized by localization of silver grains upon soil particles dispersed on electron microscope grids. The composition and identity of these particles was then established by electron microprobe analysis