“Tall oaks fallen”

“Tall oaks fallen”

Together with Joseph Gall and Hewson Swift, David Prescott was among the first to recognize the vast potential of protozoan ciliates for studies of chromosome biology. He went on to discover the phenomenon of macronuclear genome reduction and this nucleus’ selective gene amplification and led the way in early studies of telomeres, this latter work setting the stage for the later exciting era of...

From little acorns to tall oaks: from boranes through organoboranes.

Fallen Immortals

The memory of somatic cell gene expression is reset in the germline in a process that is accompanied by dramatic changes in chromatin modifications. In this issue, Katz et al. (2009) show that the histone demethylase Lsd1/Spr-5 may participate in this resetting process in the worm, thereby preventing a decline in germ cell epigenetic stability and viability over ensuing generations.

Fallen cardinals

We prove that for every singular cardinal μ of cofinality ω, the complete Boolean algebra compPμ(μ) contains a complete subalgebra which is isomorphic to the collapse algebra CompCol(ω1, μ0 ). Consequently, adding a generic filter to the quotient algebra Pμ(μ) = P(μ)/[μ] collapses μ0 to א1. Another corollary is that the Baire number of the space U(μ) of all uniform ultrafilters over μ is equal ...

Fallen Flowers

Suicide is a serious social and health problem in Korea [1]. According to a 2005 report by the Organization for Economic Cooperation and Development [2], Korea had the highest suicide rate with nearly 30 deaths per 100,000 population. Many studies have found that suicidal ideation and attempts among lesbians, gay men, and bisexual persons are higher than among heterosexual individuals (or gener...