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Biomedical subjects

M J Nelson

Publications and source records attributed to M J Nelson.

87 records · Page 5Linked to original sources
PubMed1974

A large-scale field trial of ultra-low-volume fenitrothion applied by a portable mist blower for the control of Aedes aegypti.

Long-term control of Aedes aegypti, the vector of dengue haemorrhagic fever in Thailand, was obtained by 2 thorough applications of fenitrothion mist applied at a target dosage rate of 0.1 ml per m(3) of room space. Perfect control lasted for 6-7 months after treatment and densities were substantially reduced for up to a year after treatment. Recovery of the population was still slow up to almost 16 months after treatment. This degree of control was achieved by the immediate mortalities produced by 2 treatments spaced about 2 weeks apart, the larvicidal effect of the fenitrothion aerosol, and a limited residual effect that prevented oviposition for a period, so that the recovery potential was greatly diminished. It appears that aerosol and mist treatments designed as epidemic control measures can be adapted to long-term preventive control of A. aegypti. However, the equipment used and the method of application require further improvement.

Aedes↗
PubMed1973

Sequential application of ultra-low-volume ground aerosols of fenitrothion for sustained control of Aedes aegypti.

A trial was carried out of the efficacy of fenitrothion ultra-low-volume aerosol applied by vehicle-mounted cold aerosol generator for the control of Aedes aegypti. Five applications of fenitrothion at intervals of 11-49 days at dosages of 511-1 095 ml/ha gave sustained control for 4-5 months in an area of some 14 ha containing 1 300 houses. Immediate killing of adult mosquitos and some larvicidal effect interrupted oviposition and retarded the recovery of the mosquito population. Sequential treatments applied in advance can evidently suppress the population throughout the rainy season, when epidemics of dengue haemorrhagic fever occur, and have operational advantages over larvicidal treatment. The Culex pipiens fatigans population was suppressed for only a few days after each treatment.

Aedes↗
PubMedDate not supplied

Meningeal sarcoma mimicking an acute subdural hematoma on CT.

A case of meningeal sarcoma arising at the site of a prior subdural hematoma and mimicking an acute subdural hematoma on noncontrast CT is presented. The potential confusion between a hyperdense, nonhemorrhagic lesion and a hematoma on CT is highlighted. This report also reviews the possible relationship between meningeal injury and subsequent neoplastic change.

Acute Disease↗
PubMedDate not supplied

Myelinolysis after correction of hyponatremia in two dogs.

Two dogs developed delayed neurological deterioration after rapid correction of severe hyponatremia. Sequential magnetic resonance imaging showed the development of lesions in the thalamus. One dog was necropsied, and the lesions were characterized by myelinolysis with sparing of axons and neurons. The second dog gradually recovered with no detectable neurological deficits. The syndrome seems analogous to central pontine myelinolysis in human beings. Guidelines for correction of hyponatremia to prevent development of myelinolysis are given.

Animals↗
PubMedDate not supplied

The effect of a career planning workshop on graduate dental hygienists.

Purpose. The purpose of this study was to determine the effects of a career planning workshop on the career satisfaction, decisions, and plans of graduate dental hygienists. Method. A workshop was designed to teach graduate dental hygienists a systematic process for analyzing their needs and opportunities and making informed, realistic, and satisfying career decisions. This workshop incorporated vocational testing, interpretation by a professional counselor, lecture/discussion, small group interaction, and an accompanying manual of career planning resources and exercises. Sixty-nine dental hygienists attended a two-day workshop in fall 1990. Participants completed data collection instruments consisting of 42-item pre-assessment and 40-item follow-up questionnaires designed by the authors. Sixty-three completed the pre-workshop questionnaire. Fifty-four participants responded to the follow-up questionnaire mailed six months after the workshop. Data analyses included frequency distributions, percentages, means, and standard deviations. Paired t-tests and chi-square statistics were also calculated. Results. Findings from the pre-workshop questionnaire indicated that over 76% of participants had considered leaving their present position and 70% had considered leaving the profession. The six-month follow-up questionnaire revealed that four participants had changed dental hygiene employers and two had left the profession to pursue different careers. Forty-four percent reported that their feelings toward dental hygiene as a career had become more positive since attending the workshop. Pre-workshop to six-month follow-up responses indicated increased mean satisfaction in amount of challenge, compensation/rewards, and overall career satisfaction. Conclusions. The results of this study indicated that career planning workshops, in combination with other methods, are a useful strategy for helping dental hygienists maintain satisfaction, and have the potential to promote career longevity in the dental hygiene profession.

Adult↗