an investigation of the incidence of colour defects was made in primary school students. the children ranged in age from 7 to 14 years. the frequencies were 7,04 per cent. for males and 0,53 per cent. for females.

One thousand and forty-two McKee-Farrar prostheses of the present design inserted in Norwich from January 1965 to December 1972 have been reviewed retrospectively to determine the incidence of complications needing revision. Of prostheses implanted for more than two years, 6-6 per cent needed revision for loosening (cup 3-5 per cent; stem 2-2 per cent; both components 0-9 per cent). Of the tota...

We consider local alignments without gaps of two independent Markov chains from a finite alphabet, and we derive sufficient conditions for the number of essentially different local alignments with a score exceeding a high threshold to be asymptotically Poisson distributed. From the Poisson approximation a Gumbel approximation of the maximal local alignment score is obtained. The results extend ...

T h e prevalence of manic depressive illness the world over is generally believed to be aroimd 3-1/1000, whereas the period prevalence for all forms of depressions has been estimated at 3 per cent per annum in North American population (Lehmann, 1971). Hospital data from various centres in India have given conflicting findings. Generally tfie figures from North India have been consistently high...

The problem of house fly has become more acute everywhere especially in poultry and piggery farms. They act as potential vector for many viral, bacterial, helminthic and protozoan diseases and as nuisance pests. The control of fly is very much effected by the use of synthetic organic insecticides. These drugs, even though efficacious, can be detrimental to the mankind and environment and also l...