Introduction Critical flicker fusion frequency (cFFF) measures visual perception, with higher values indicating better performance. It is widely used to assess the effects of breathing gases in diving and hyperbaric environments. Aim Identify confounders explaining inconsistent cFFF study results. Methods Four experiments using a manual flicker device in volunteers with healthy eyes: 1. cFFF was measured in 174 recreational di...

Summary Conjugative DNA ‐transfer in mycelial streptomycetes is a unique process, manifested on agar plates by the formation of circular growth retardation zones called pocks. Because pock size correlates with the extent of the transconjugant zone, it was suggested that pocks reflect the spreading of the transferred plasmid in the recipient mycelium. However, this concept has not been experimentally proven yet. The use of an e...

45The industrialization of the United States throughout the 19th century resulted in the exploitation of millions of acres of timberland across the country. Logging during that era was described by critics as “cut out and get out” because the land was usually abandoned after the merchantable timber was exhausted. Concern about future timber supplies and the effect of logging on watersheds spurred the development of professiona...