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Biomedical subjects

J K Mason

Publications and source records attributed to J K Mason.

At least 19 recordsLinked to original sources
PubMed2005

Quantitative insight into dislocation nucleation from high-temperature nanoindentation experiments.

Nanoindentation has become ubiquitous for the measurement of mechanical properties at ever-decreasing scales of interest, including some studies that have explored the atomic-level origins of plasticity in perfect crystals. With substantial guidance from atomistic simulations, the onset of plasticity during nanoindentation is now widely believed to be associated with homogeneous dislocation nucleation. However, to date there has been no compelling quantitative experimental support for the atomic-scale mechanisms predicted by atomistic simulations. Our purpose here is to significantly advance the quantitative potential of nanoindentation experiments for the study of dislocation nucleation. This is accomplished through the development and application of high-temperature nanoindentation testing, and the introduction of statistical methods to quantitatively evaluate data. The combined use of these techniques suggests an unexpected picture of incipient plasticity that involves heterogeneous nucleation sites, and which has not been anticipated by atomistic simulations.

Journal Article↗
PubMed2004

Wrongful life: the problem of causation.

The paper considers the status of the wrongful life action particularly in the light of the recent acceptance of such actions in continental Europe. It is considered that the hurdle of causation is still not adequately overcome in these cases and, in a search for an answer to the difficulty, the author re-examines the Canadian case of Cherry v Borsman. This case was originally thought of as one of wrongful life associated with a negligently performed abortion and the paper attempts to overcome the problems of causation by comparing and contrasting the roles of the genetic counsellor and the abortionist. While the attempt is by no means wholly successful, it also serves to draw attention to some significant differences between wrongful life actions based on physical and mental disability in the neonate.

Abortion, Induced↗
PubMed1994

Building the team during consolidation.

It has been said that change is the only constant, and that certainly holds true for health care settings in the 1990s. Consolidation of two hospitals is one such change. To be successful, the organization and its managers must deal with these changes in a proactive, positive, opportunity-seeking way. Fostering positive relationships with others in the work setting is as important as the fine tuning of clinical skills.

Health Facility Merger↗
PubMed1994

Neurological sequelae of the operation "baby lift" airplane disaster.

The aircraft disaster of the first flight of Operation "Baby Lift", which departed from Saigon, Vietnam, April 4, 1975, was survived by 149 orphaned children on their way to adoptive homes in the West. It had 157 passenger fatalities. The aircraft disaster exposed the surviving children to a complex disaster environment in which subatmospheric decompression, hypoxia, and deceleration were experienced, many children suffered a transient unconsciousness. We examined 135 surviving children between 1978 and 1985. The U.S. resident children were examined in the years 1979 to 1982 at an average age of 8 years and 6 months. They displayed the following symptomatology: attention deficit (> 75%), hyperactivity (> 65%), impulse disorder (> 55%), learning disabilities (> 35%), speech and language pathology (> 70%), and soft neurological signs (> 75%). The European children were examined in the years 1983 to 1985. On arrival at the adoptive home, 2 weeks after the accident they displayed the following symptomatology: muscle hypotonia (26%), seizures (2.5%), and regressed developmental milestones (33%). At the time of the diagnostic evaluations (1983 to 1985) the average age was 11 years and 8 months. They displayed the following symptomatology: attention deficit (59%), hyperactivity (52%), impulse disorder (48%), learning disabilities (43%), soft neurological signs (43%), epilepsy (16%), and speech and language pathology (34%). We conclude that a complex disaster environment can cause brain damage in children without prolonged unconsciousness, and that victims of disasters require a thorough evaluation from a multidisciplinary team.

Accidents, Aviation↗
PubMed1993

The legal threat to medicine reconsidered.

The paper is concerned, in the main, with selective non-treatment of those incapable of making treatment decisions of their own. It draws attention to the conflict between the law and the medical profession in this field which was predicted some ten years ago and traces the British case law from then until the present day. It concludes that there is no such legal threat to medical practice in Great Britain and that any doubtful practices are currently controlled through the concept of the health care team.

Euthanasia↗
PubMed1987

The right to die.

Explore the source record for details and available documents.

Abortion, Legal↗
PubMed1986

Parental choice and selective non-treatment of deformed newborns: a view from mid-Atlantic.

This paper traces the development of parental rights to accept or to refuse treatment for a defective newborn infant in the United Kingdom and in the United States of America; its main purpose is to explore the common trends from which an acceptable policy may be derived. It is probable that the British law on parental decision-making in respect of infants suffering from Down's syndrome is to be found in the civil case of In Re B rather than in the criminal case of R v Arthur. United States court decisions are strongly influenced by constitutional law and reflect the right to personal privacy. The position on each side of the Atlantic seems very similar but this similarity includes a sense of uncertainty as to legal responsibility. There is a case for agreed guidelines and a suggested format is offered for consideration.

Congenital Abnormalities↗
PubMed1984

The importance of autopsy examination in major disasters.

It is appreciated that there are national and jurisdictional variations in regard to post-mortem dissections following accidental death. The purpose of this paper is to plead that, since there will be nationals of many states involved in an aircraft disaster, there should be a uniform system of forensic investigation on a world wide basis. The justification for this recommendation is illustrated through the investigation of accident causes and through the solution of the many problems relating to the settlement of probate which arise in accidental death. The causes of accidents which may be discovered by autopsy include crew incapacitation and criminality of all types. The emergency status may also be revealed and the type of accident, particularly whether in a controlled or uncontrolled phase, may become clear. The medico-legal problems to be resolved include those concerning payment of insurance policies, including the degree of life expectancy, and especially the disposal of estates when members of a family apparently die together. The resulting payments to beneficiaries may be quite different depending on the quality of the autopsy. These investigations are complementary to, and do not interfere with, the identification process but they are time consuming and expensive.

Accidents, Aviation↗