Radioactivity in Thyroid Glands Following Nuclear Weapons Tests: L. Van Middlesworth . ........................................... 982 Gum Replica Technique for Electron or Light Microscopy: G. E. Hess and E. J. Schantz ...... .............................. 983 Action of p-{Di(2-chloroethyl) }-amino-L-phenylalanine of HardingPassey Mouse Melanoma: J. M. Luck ..... ........................ 984 I...

Heteropteran chromosomes are holokinetic; during mitosis, sister chromatids segregate parallel to each other but, during meiosis, kinetic activity is restricted to one pair of telomeric regions. This meiotic behaviour has been corroborated for all rod bivalents. For ring bivalents, we have previously proposed that one of the two chiasmata releases ¢rst, and a telokinetic activity is also achiev...

Pmean/PPL = [(I :E )+ R]/[(I :E )+ 1] where R is defined as: R = Ppeep/PPL. Based upon this model, it can be shown that (1) increasing I :E ratio will increase Pmean/PPL in a self-limiting logarithmic manner; (2) Pmean/PPL is a linear function with respect to R; (3) increases in R are associated with a diminished effect of I :E ratio on Pmean/PPL; (4) similarly, increases in I :E ratio are asso...

The genetic variability of odor-conditioned probing behavior was investigated in a population of Leptopilina boulardi, a parasitoid of Drosophila larvae. Ovipositor probing is the final step of host location, leading to the discovery of host larvae. It can be triggered by an odor previously experienced during an oviposition as a result of associative learning. This study was based on the analys...

The interdiffusion coefficients in bcc ( ) and fcc ( ) Fe-Ni alloys below their Curie temperatures have been calculated based on the magnetic contribution to the free energy for interdiffusion. The free energy for interdiffusion due to magnetic ordering in bcc Fe-Ni alloys is positive. The calculated interdiffusion coefficients in bcc Fe-Ni alloys fit the experimental data quite well. In fcc Fe...

Previous studies on various marine mollusc species have shown that both larval and juvenile growth rates are substantially heritable, but few workers have examined the extent to which larval and juvenile growth rates covary. We examined the relationship between larval and juvenile growth rates in seven laboratory experiments conducted between 1986 and 1993, using the prosobranch gastropods Crep...

A determinantal expansion due to Okada is used to derive both a deformation of Weyl’s denominator formula for the Lie algebra sp(2n) of the symplectic group and a further generalisation involving a product of the deformed denominator with a deformation of flagged characters of sp(2n). In each case the relevant expansion is expressed in terms of certain shifted sp(2n)-standard tableaux. It is th...

Spectral attenuance and photosynthetic performance over the range 300 to 700 nm were examined in red-tide populations of Prorocentrum micans and Gonyaulax polyedra collected off La Jolla, California, USA, in May 1969 and M a y June 1985; and in spring 1969, November 198t and AprilMay 1982, respectively. In the near ultraviolet (UV), high attenuance and diminished photosynthetic effectiveness we...