In order to study the release of DNA from Streptococcus pneumoniae in vitro during spontaneous growth and treatment with ceftriaxone or rifampin, a semiquantitative polymerase chain reaction was used. During spontaneous growth, high concentrations of bacterial DNA were released. Exposure to 10 microg/ml of ceftriaxone decreased the DNA release, in median, by 19 times (P=0.03 vs. spontaneous growth). Treatment with 10 microg/ml of rifampin led to a reduction of DNA release, in median, by a factor of 49 (P=0.03 vs. ceftriaxone; six experiments performed on different days).
AC resistance, usually paid less attention to than inductance and capacitance during power system design work, may cause significant deviation to true result if not well controlled during load flow design for variable frequency and long cable applications. In this paper, a load flow scheme integrating cable design with power system design is proposed, benefiting from IEC 60287. With thermal consideration based on IEC 60287, AC resistances at load current taking into account the longitudinal distribution of current are iterated in a power load flow. Case results demonstrated that the correct consideration of AC resistance is critical to the derivation of true result. The proposed load flow scheme naturally bridges the gap between cable engineering and power system engineering and reduces the uncertainty in system design work for variable frequency and long cable applications. Index Terms-load flow, variable frequency, submarine cables, subsea power, wind power, mat power, IEC 60287
Following a brief historical review, this paper describes the procedure used at the PTB to determine the SI unit of resistance based on a calculable cross capacitor.
Continuous radiotelemetry of direct arterial blood pressure and heart rate was performed in eight healthy subjects (seven men, one woman; average age 26 years) on a fitness trail. The results demonstrate that such running represents a maximal effort, at 192/min heart rate (age-related maximum). The heart rate remained constant whether on largely dynamic exercise during running or on largely static effort during gymnastic exercise. During running, blood pressure rose up to 151/79 mm Hg, while gymnastic exercise gave mean values of up to 200/130 mm Hg as a result of sustained muscle contractions and forced breathing. Such uncontrolled maximal effort may be unexpectedly dangerous to persons with cardiovascular disease and fitness trails should not be recommended in the rehabilitation of cardiac patients.
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