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L Butler

Publications and source records attributed to L Butler.

47 records · Page 3Linked to original sources
PubMed1977

Recombination values and their errors.

Two four-point testcrosses comprising 87,000 tomato plants were grown and the data collected from 28 subgroups. Each subgroup consisted of 2,000 or 5,000 plants and should give a valid estimate of the three recombination values. The 28 values for each interval give more outlyers (23% are outside the 95% limits set by the standard deviation calculated by the binomial formula square root of p q/n) than would be expected by chance. If each subgroup was regarded as the control and the other groups tested against this, then 42% of the time the two subgroups would be significantly different. It is suggested that there are many cases in the literature where this comparison has been made and the significant difference wrongly ascribed to treatment. While the causes of these changes in recombination value are unknown and therefore uncontrollable, they must be anticipated in all such studies. Control and treatment must be replicated enough that chance extreme values will not be attributed to treatment.

Crosses, Genetic↗
PubMedDate not supplied

Retrieval of the critically ill in South Australia: a coordinated approach.

A system is described for the stabilization and evacuation of the critically ill in South Australia, with a discussion of experience in 278 patients. The integration of activities of peripheral medical practitioners, major teaching hospitals, and the ambulance transport authority (St John Ambulance Council) is paramount. Modes of communication are by "urgent line" telephone and radio. Advanced life-support equipment is portable, may be placed in any ambulance vehicle, and is used and maintained principally by the staff of intensive care units. The design characteristics of a suitable road vehicle and fixed-wing aircraft are considered, with emphasis on dimensions for the particular needs of advanced life-support. The cost of transporting such a patient is approximately two-thirds of an average bed day cost in a public hospital, plus the basic ambulance charge. The number of patients who need such measures is 0.2% of the total number of patients carried by ambulance per annum.

Adolescent↗