monochromator slit width. (Increasing the lamp current would also reduce UBE.) However, in none of the cases investigated would this produce a significant reduction in the total absorbance noise. (Even if up were reduced to zero, OA would not be reduced by more than 30% in any case.) In addition, increasing the lamp current or slit width would lead to a reduction of the absorbance signal in many cases and consequently have a detrimental effect on the detection limit.Lamp flicker noise can be reduced by using a double beam system to monitor changes in lamp intensity. However, if the lamp duty cycle is unchanged, the double beam system necessitates halving the time of observation of the lamp. This

The electrical resistance of a bimolecular lipid membrane in 0.1 molar NaCl decreases if antibody and complement are present on one side of the membrane and the homologous antigen is added to the other side. The reaction occurs within minutes and requires less than 0.1 microliter of antiserum.

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SUMMARYChronic irradiations of mice with 3-cm microwaves, carried out at the University of California during the past several years, have shown no clear effects on longevity at the sublethal doses employed. Some other effects, notably with regard to cancer of the white cells and testicular damage, resulted from this pilot study. A detailed description of the results appears in Trans. IRE BME-9: 104-108, 1962.This report also contains a summary of the results obtained by P. 0. Vogelhut in irradiating enzymes at the same wavelength; these results are described in greater detail in another report (Issue No. 476) in this Series.