Isolation of the membrane cooling and sweep gases from TPE's vacuum chamber has been demonstrated by sealing tests performed up to 1000 °C of a membrane holder design that provides easy change out of membrane specimens between tests.
In 1901, while attempting to determine the moisture content in a granule of starch, a botanist at the New York Botanical Garden, Alexander P. Anderson, filled hermetically sealed test tubes with cornstarch and wheat flour, and toasted the contents in a five-hundred-degree oven.
tremula) aspen genotypes were studied using two different types of culture vessels: tightly sealed Petri dishes (15 × 54 mm) designed to provide restricted gas exchange (RGE) conditions, and capped (but not sealed) test tubes (150 × 18 mm) providing control conditions.
Open image in new window Fig. 51 Major components of floating oil-seal test device.
Tests have been carried out at different rod speeds, pressures and temperatures on a reciprocating seal test rig.
1 Support, 2 2 V belt tension device, 3 electric control console, 4 moter, 5 oil tank, 6 shaft, 7 static ring fixer, 8 float oil seal, 9 moving ring fixer, 10 axial loading device Open image in new window Fig. 52 Floating oil-seal test device.
Upon initial whole cell patch, a seal test and membrane test measured the following parameters: cell membrane capacitance (Cm), cell membrane resistance (Rm), access resistance (Ra), and holding current (I hold) necessary to keep the membrane at -65 mV.
Based on the standard seal test, as implemented in pClamp 10, cell capacitance (variable #1: Cm, pF); membrane resistance (variable #2: Rm, GΩ), and access resistance (#3: Ra, MΩ) were measured.
Exposure assessment for the original mortality study (Sinks et al. 1992) was based on duration of employment in jobs judged to have high direct PCB exposure (impregnating, sealing, and testing capacitors), based on personal and area air sampling.
The study cohort for this analysis was restricted to 2572 workers (Plant 1: 973; Plant 2: 1599) who held jobs identified as having the highest, most direct exposure to PCBs (e.g., impregnation, sealing and testing capacitors) and excluded workers confirmed at the time of the original study to be solvent exposed [ 4].
