Land Clearance in the Irish Neolithic: New Evidence and Interpretation

Time scales are derived, from radiocarbon dating of pollen diagrams, for Neolithic land clearance at three Irish sites. Three stages are distinguished beginning in the 4th millennium B.C.: stage A, clearance and farming (possibly arable), 100 to 400 years; stage B, farming (possibly pastoral), 150 to 200 years; and stage C, forest regeneration, 50 to 100 years.

Decametric Radio Pulses from Jupiter: Characteristics

On occasion the decametric radio bursts from Jupiter contain pulses of millisecond duration. Study of data for 2 years shows that the distribution in Jovian longitude of these fast pulses is different from that of the more common pulses of longer duration. The two classes of pulses also appear to be differently affected by the position of the innermost Galilean satellite.

Jupiter's Decametric Emission Correlated with the Longitudes of the First Three Galilean Satellites

An analysis of data obtained at a variety of frequencies since 1957 has confirmed Bigg's observation that the satellite Io appears to control the emission of decametric radio energy by Jupiter. The correlation is stronger when intensity, rather than simple probability, is included in the analysis. There is also evidence of a similar influence by the satellites Europa and Ganymede.

Cytological observations on the sporulation process of Clostridium perfringens

Images

The Effect of Acriflavine and Phosphine GRN on Lysis of Bacteria by Bacteriophage

The specificity of two acridine compounds in inhibiting lysis by bacteriophage was shown in the reaction of four bacteria-bacteriophage systems to their presence. The phage-inhibiting effect of one of these compounds, acriflavine, was effectively neutralized by yeast nucleic acid, riboflavin, thiamin, nicotinamide and sodium lauryl sulfate. This is in contrast to the work of Fitzgerald and Lee (6) with phosphine GRN where only yeast nucleic acid was found to be effective.