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Biomedical subjects

M D Fox

Publications and source records attributed to M D Fox.

45 records · Page 3Linked to original sources
PubMed1977

Tick-borne relapsing fever: an interstate outbreak originating at Grand Canyon National Park.

During the 1973 summer season, 27 employees and 35 overnight guests at the North Rim, Grand Canyon National Park, Arizona, acquired febrile illnesses compatibel with relapsing fever. Sixteen cases were confirmed by finding Borrelia spirochetes in peripheral blood smears or inoculated Swiss mice. Retrospective surveys of 278 employees and 7247 guests at the park revealed that acquisition of illness was significantly associated with the persons sleeping in rustic log cabins and acquiring bites of "unknown" insects. From rodent nesting materials found in the walls and attics of cabins where cases had occurred, infective Ornithodoros hermsi ticks were recovered. Exceptional activity of ticks in human populations appeared to have resulted from a decreased population of the ticks' usual rodent hosts. Vector control activities consisted of spraying the cabins with residual insecticide, removing nesting materials, and "rodent proofing." This outbreak, the largest yet identified in North America, extends the known range of a principal vector and establishes the North Rim as an endemic source of tick-borne relapsing fever.

Adult↗
PubMed1977

Holographic interferometric measurement of motions in mature plants.

Holographic interferometry has been used to plot graphs of the phototropic and geotropic bending undergone by a mature Stapelia variegata Linn over a 5-minute period. The holographic interferometric technique is shown to have the advantage of measuring displacements at least as small as 0.16 micrometers which permits observation of extremely slow plant motions over time periods of a few minutes. In addition, the holographic technique provides a permanent record of displacement information over the entire plant in a single hologram. The short 5-minute period required to produce a holographic interferogram has permitted the monitoring of slow plant motions by recording a series of consecutive holograms at 5-minute intervals over a 75-minute period. The results have been plotted on a graph thereby capturing for the first time such small displacement, velocity, and acceleration of a mature plant as a function of time.

Journal Article↗
PubMedDate not supplied

Neonatal morbidity between 34 and 37 weeks' gestation.

The objective of this study was to determine the risk of significant neonatal morbidity in women with preterm labor who deliver between 34 and 37 weeks' gestation. A total of 101 women between 34 and 37 weeks' gestation with documented preterm labor met inclusion and exclusion criteria; 90 gave informed consent and were randomly assigned to receive either intravenous magnesium tocolysis (treatment group) or conservative management with hydration, sedation, and observation (control group). Of the 90 women entering the study (45 in the treatment group and 45 in the control group), 2 discontinued tocolytic therapy because of gastrointestinal side effects. The gestational age on admission, cervical dilatation at diagnosis of preterm labor, interval to delivery, and birth weight were not significantly different between the treatment and control groups. There were no serious neonatal complications. In each group, three women had transient tachypnea and one had respiratory distress syndrome. We conclude that neonatal morbidity after delivery between 34 and 37 weeks' gestation is unchanged whether or not attempts to arrest labor are unsuccessful. The extra expense and maternal risk of tocolysis are not justified by beneficial results in the infant.

Adult↗