beta-decay study of Cu-77

A beta-decay study of Cu-77 has been performed at the ISOLDE mass separator with the aim to deduce its beta-decay properties and to obtain spectroscopic information on Zn-77. Neutron-rich copper isotopes were produced by means of proton- or neutron-induced fission reactions on U-238. After the production, Cu-77 was selectively laser ionized, mass separated and sent to different detection systems where beta-gamma and beta-n coincidence data were collected. We report on the deduced half-live, decay scheme, and possible spin assignment of 77Cu

PROSPECTIVE GROWTH STIMULATORS OF BACTERIAL MASS OF STAPHYLOCOCCUS AUREUS (TO PRODUCE PROTEIN А)

The influence of 2-hydroxyethylammonium salts of biologically active arylsulfanylacetic acids on the yield of bacterial mass of Staphylococcus aureus (strain 209), biomass of Merezhkovsky's bacteria (Salmonella typhi spermophilorum.) and E. coli (E. coli М-17) has bee studied for the first time. The introduction of growth stimulators (in concentration of 10-3-10-8 wt. %) into nutrient medium increases the yield of microorganisms bacterial mass: Staphilococcus aureus by 32-40 %, Merezhkovsky's bacteria Salmonella typhi spermophilorum. by 47,5-140,4 %, E. coli by 11,4-59,4 %. The increase of yield of the microorganisms biomass reached by application of the growth stimulators opens the route to their utilization in large-scale processes of Staphilococcus aureus cultivation for the production of valuable protein А, biopreparations, diagnostic agents, serum, vaccines, probiotic drugs as well as for the struggle with rodents (plaque carriers, pests)

A New Precision Measurement of the 7Be(p,gamma)8B Cross section with an Implanted 7Be Target

The 7Be(p,gamma)8B reaction plays a central role in the evaluation of solar neutrino fluxes. We report on a new precision measurement of the cross section of this reaction, following our previous experiment with an implanted 7Be target, a raster scanned beam and the elimination of the backscattering loss. The new measurement incorporates a more abundant 7Be target and a number of improvements in design and procedure. The point at Elab=991 keV was measured several times under varying conditions, yielding a value of S17(Ec.m. =850 keV) = 24.0(5) eV b. Measurements were carried out at lower energies as well. Due to the precise knowledge of the implanted 7Be density profile it was possible to reconstitute both the off- and on resonance parts of the cross section and to obtain from the entire set of measurements an extrapolated value of S17(0)=21.2(7) eV b.Comment: 4 Pages, 3 Figure

ANTIGENIC AND PROTECTIVE PROPERTIES OF ASSOCIATED VIRUS VACCINE AGAINST SHEEP POX, GOAT POX AND PESTE DES PETITS RUMINANTS

H^t of occurrence of sheep and goat pox and peste des petits rum^nts requires development of new vaccines and improvement of available associated ones. Their administration allows for the reduction of vaccination time frames and cost. The study results demonstrated tat associated as well as monovalent virus vaccines against sheep pox, goat pox and peste des petits rum^nts have good antigenic properties. The vaccination induced high level of virus neutralizing antibodies against each of the above listed diseases and ensured formation of strong immunity tat is supported by the results of tallenge of sheep with virulent sheep pox virus (“Afghanistan” strain). In 14 and 21 days in blood of sheep immunized with the virus vaccine against sheep pox, goat pox and peste des petits rum^nts titres of antibodies against sheep pox virus ((4.17±0.12)-(4.84±0.31)) and PPR ((5.92±0.23)-(6.08±0.23)) were higher as compared to goat pox antibody titres ((1.99±0.89)-(3.53±0.58) log2). Herewith, antibody titres in blood sera of animals vaccinated with monovalent vaccine against sheep pox were higher against homologous virus ((3.62±0.12)- (4.08±0.31)) as compared to goat pox ((2.50±0.50)-(2.25±0.25) log2). The data demonstrate tat the associated vaccines may be used for preventive vaccination against sheep pox, goat pox and peste des petits rum^nts

β-decay study of ^{77}Cu

Physical Review