Changes in sporulation ability during the vegetative cell cycle insaccharomyces cerevisiae

The relationship between the sporulation ability and the stage of the vegetative cell cycle was studied. The ability of mature cells to sporulate was the highest just before bud initiation and decreased rapidly as soon as detectable buds appeared. The mitotic DNA synthesis was competitive with the premeiotic one.     

New organic reference materials for carbon- and nitrogen-stable isotope ratio measurements provided by Center for Ecological Research,Kyoto University,and Institute of Biogeosciences,Japan Agency for Marine-Earth Science and Technology

We determined both carbon and nitrogen isotope ratios of ten organic reference materials (CERKU-01 to CERKU-10) in the Center for Ecological Research (CER), Kyoto University, and three organic reference materials (BG-A, BG-P, and BG-T) in the Institute of Biogeosciences (BioGeos), Japan Agency for Marine-Earth Science and Technology (JAMSTEC), using an internationally recommended calibration method of two-point anchoring. The reference materials cover δ¹³C_VPDB range of −34.92 to −9.45‰ and δ¹⁵N_Air range of −5.22 to 22.71‰ and can be used to measure isotope ratios of naturally occurring substances.