Abstract The Chiba composite section (CbCS) in the Kokumoto Formation, Kazusa Group, central Japan is a thick and continuous marine succession that straddles Lower–Middle Pleistocene boundary well-recognized Matuyama–Brunhes paleomagnetic polarity boundary. Although recent studies extensively investigated CbCS, its chemostratigraphy, particularly around boundary, poorly understood. Therefore, t...

background and objectives: streptococcus pneumoniae is the most common cause of invasive infections among both young children and elderly people. common serotypes causing invasive diseases and the emergence of carriers of streptococcus pneumoniae in iran is not yet known. past-vaccine surveillance studies of serotype prevalence patterns in iran are necessary to monitor the epidemiology of strep...

Symmetrical and asymmetrical cyclopropenones with diferrocenyl, diaryl and aryl-ferrocenyl substituents were obtained and their chemical behavior was studied. 1-Ethoxy-2,3-diarylcyclopropenylium terafluoroborate selectively reacts with MeLi, n-BuLi with formation of the 3,3-dialkyl-1,2-diarylcyclopropenes. The structures of 2,3-bis(4methoxyphenyl) cyclopropenone (10), 2-ferrocenyl-3-(4-methoxyp...