Synthesis and antimicrobial studies of Mn(II), Co(II), Ni(Ii), Zn(II) and Cd(II) complexes derived from Schiff base: 2-amino-N-(2-(R)-2-amino-1- Hydroxy-3-phenylpropylidene) amino) ethyl)-3-phenylpropanimidic

The Schiff base 2-amino-N(2-(R)-2-amino-1-hydroxy-3-phenylpropylidene)amino) ethyl)-3- phenylpropanimidic was obtained by refluxed condensation of ethylenediamine with phenylalanine. The ligand was isolated by filtration, washed with water-ethanol mixture and characterized by FTIR, UV-visible spectroscopy, melting point determination and conductivity test. The compound was used to prepare the complexes of Mn(II), Co(II), Ni(II), Zn(II) and Cd(II). The metal-ligand ratio was determined using the Job’s method of continuous variation. From the result of IR spectroscopy, the structure of the proposed ligand showed an absorption of 1558cm-1 due to azomethine which was shifted to higher frequency range of 1559-1624cmK-1 upon complexation with metal ions that coordinated the ligand through both oxygen and nitrogen.Keywords: Antimicrobial, schiff bases, synthesis, tetradentate ligand

Correlation between air radioactivity and air masses in greece during the period 1964-1972

Daily radioactivity measurements of air samples collected in Athens, Greece, have been performed continuously since 1964. Correlation of such determinations with meteorological data has resulted in some interesting conclusions. The atmospheric nuclear testing of the early 1960s caused elevation levels of air radioactivity in Athens. The highest annual value for air radioactivity in this study was for 1964 when the value was 1.06 pCi/m3. A general decrease in air radioactivity was noted ensuing years with the mean annual value dropping to 0.12pC i/m3for 1972. Correlations of daily air radioactivity determinations with meteorological data have shown that movements and origins of surface air masses result in changes in air radioactivity levels. Mediterranean air masses or masses of air arriving by a Mediterranean pathway seem to carry more radioactive material than other pathways studied. An inverse correlation was found between the frequency of air mass variations and quantity of radioactive material, i.e. the lower frequency air mass variations tend to carry larger amounts of radioactive material. © 1975 Health Physics Society

Correlation between air radioactivity and air masses in greece during the period 1964-1972

Daily radioactivity measurements of air samples collected in Athens, Greece, have been performed continuously since 1964. Correlation of such determinations with meteorological data has resulted in some interesting conclusions. The atmospheric nuclear testing of the early 1960s caused elevation levels of air radioactivity in Athens. The highest annual value for air radioactivity in this study was for 1964 when the value was 1.06 pCi/m3. A general decrease in air radioactivity was noted ensuing years with the mean annual value dropping to 0.12pC i/m3for 1972. Correlations of daily air radioactivity determinations with meteorological data have shown that movements and origins of surface air masses result in changes in air radioactivity levels. Mediterranean air masses or masses of air arriving by a Mediterranean pathway seem to carry more radioactive material than other pathways studied. An inverse correlation was found between the frequency of air mass variations and quantity of radioactive material, i.e. the lower frequency air mass variations tend to carry larger amounts of radioactive material. © 1975 Health Physics Society

Developments in Pyrotechnics (Review Paper)

The application of smoke and various types of smoke bombs/ devices developed are narrated. The light output of 51 mm, 81 mm, 120 mm and 120 mm LRM illuminating bombs developed is 2.6, 9.0, 10.8 and 15 lakhs candela, respectively. The IR flares developed for first and second generation anti-tank missile are in regular production. An IR decoy flare is developed for CMDS. Feasibility study on multi-spectral smoke and IR flare compositions is completed. 1W-1A No fire capability EED is developed. Gas generators 1200 cc, 2400 cc, 6000 cc are developed. Accuracy of pyro delay is improved. Laser initiated pyrocartridge is developed. Nanoscale Fe2O3 is synthesised and studied. A few toxic ingredients are replaced to march towards green pyrotechnics. Objectives for improved pyrotechnics are included.Defence Science Journal, 2010, 60(2), pp.152-158, DOI:http://dx.doi.org/10.14429/dsj.60.33