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AIMS To measure the prevalence of silicosis among black migrant contract workers on a South African goldmine and to investigate exposure-response relations with silica dust. METHODS In a cross sectional study, 520 black goldminers (aged >37 years) were interviewed and had chest radiographs taken. Silicosis was defined as International Labour Organisation(More)
AIMS To examine the effect of silica exposure, in the absence of silicosis, on the prevalence of pulmonary tuberculosis (PTB), which is epidemic among South African gold miners. METHODS Cross-sectional study of 520 gold miners over 37 years of age. Length of service, and cumulative and average dust and quartz exposure indices were derived for each miner.(More)
OBJECTIVE The insulin hypoglycaemia test (IHT) is believed to be the most reliable test for evaluating the entire hypothalamo-pituitary-adrenal (HPA) axis. The lower limit for the normal peak serum cortisol response has been reported to be between 500 and 580 nmol/l. Reference levels for a normal plasma ACTH response have not been reported recently. (More)
We investigated the associations between leg length and specific ballet movements in different skill groups. Volunteers were from an undergraduate dance programme (n=18), a pre-professional school (n=43) and from an elite classical ballet company (n=45). Individual data were collected for anthropometry, vertical jump, leg dexterity, and leg active and(More)
  • E Ee Botta, K Dekker, +4 authors Em De Zeeuw
  • 2003
On the occasion of the third centenary of the appointment of Johann Bernoulli at the University of Groningen, a number of linear systems solvers for some Laplace-like equations have been compared during a one-day workshop. CPU times of several advanced solvers measured on the same computer (an HP-755 workstation) are presented, which makes it possible to(More)
In this note the exact order ofB-convergence is determined for them-stage Gaussian Runge-Kutta method. Form=1 this order is 2, whereas form≥2 this order turns out to be onlym. In dieser Note bestimmen wir die exakteB-Konvergenzordnung desm-stufigen Gauss'schen Runge-Kutta Verfahrens. Fürm=1 ist diese Ordnung 2, während sich fürm≥2 nurm als Ordnung ergibt.
The mechanisms underlying hyperarousal, the key symptom of insomnia, have remained elusive, hampering cause-targeted treatment. Recently, restless rapid-eye-movement (REM) sleep emerged as a robust signature of sleep in insomnia. Given the role of REM sleep in emotion regulation, we hypothesized that restless REM sleep could interfere with the overnight(More)
OBJECTIVE We sought to determine the possible association among vaginitis, cervicitis, and cervical length in pregnancy. STUDY DESIGN Primigravid volunteers, between 20 and 36 weeks' gestation (n = 210), were examined. Vaginitis was diagnosed by pH determination and wet mount smear, cervicitis was diagnosed by cervicography, and cervical length was(More)
Individuals differ in thermosensitivity, thermoregulation, and zones of thermoneutrality and thermal comfort. Whereas temperature sensing and -effectuating processes occur in part unconsciously and autonomic, awareness of temperature and thermal preferences can affect thermoregulatory behavior as well. Quantification of trait-like individual differences of(More)
BACKGROUND The prevalence of hyperglycaemia in patients with diabetes mellitus at admission is high. Prevention and treatment is important to prevent further clinical complications. We have conducted a study evaluating implementation of a new protocol to standardise inpatient care of patients with diabetes mellitus. METHODS A retrospective study including(More)