Polypropylene plates

A circular polypropylene plate, 150 nun in diameter is simply supported around its edge and is subjected to a uniform pressure of 40 kN/m. If the stress in the material is not to exceed 6 MN/m, estimate a suitable thickness for the plate and the deflection, 6, after one year. The stress in the plate is given by... 

Microwave-assisted solid-phase parallel synthesis has also been reported using multi-well filter-bottom polypropylene plates [45,155]. However, it should be mentioned that the thermal instability of the polypropylene plates is a limitation of this setup. In addition, uneven heating across the plate results in higher temperatures (AT 10-20 °C) being observed at the center of the plate than at the edges. 

The reaction block, which provides a fully enclosed reaction environment (Teflon, polypropylene, and silicone rubber seals) is a slightly modified version of a design first disclosed by Sphynx Pharmaceuticals [23]. Figure 9 shows the reaction block and the reagent vials (100, 30, and 10 mL sizes) in their fully assembled and disassembled states. Floles at the bottom of the wells of the 96-deepwell polypropylene plate (sealed in fully assembled reaction block) allow the reaction solutions to be removed from the wells (via a separate vacuum plenum) and the functionalized resin (retained by Teflon frits) to be washed with solvents. 

Concentrated metal hydroxide sludge is pumped from the clarifier to a polypropylene plate filter press [T-102], The plate filter press56 is of sufficient capacity without any buildup in the lamellar portion of the unit. This also prevents any overflow of precipitate to the sewer system. The metal hydroxides form a dense sludge cake suitable for disposal in an approved landfill. The liquid effluent from the plate filter is returned to the surge tank [T-99],... 

Several articles in the area of microwave-assisted parallel synthesis have described irradiation of 96-well filter-bottom polypropylene plates in conventional household microwave ovens for high-throughput synthesis. While some authors have not reported any difficulties in relation to the use of such equipment (see Scheme 4.24) [77], others have experienced problems in connection with the thermal instability of the polypropylene material itself [89], and with respect to the creation of temperature gradients between individual wells upon microwave heating [89, 90]. Figure 4.5 shows the temperature gradients after irradiation of a conventional 96-well plate for 1 min in a domestic microwave oven. For the particular chemistry involved (Scheme 7.45), the 20 °C difference between the inner and outer wells was, however, not critical. 

This author and coworkers at Beckman Coulter first described the use of a low form 96-well plastic microplate for automated micro-ELISA immunoassays (Matson et al., 2001). The polypropylene plate was first modified by a radiofrequency plasma amination process (Matson et al., 1995) followed by conversion to an acyl fluoride surface chemistry for rapid covalent attachment of biomolecules. Proteins (1 to 2 mg/mL) were prepared in 50 mM carbonate buffer, pH 9, containing 4% sodium sulfate (to improve spot uniformity) and printed using a conventional arrayer system. Approximately 200-pL droplets of monoclonal antibodies (anti-cytokine) were deposited into the bottom of the microwells using a Cartesian PS7200 system equipped... 

Conference, 2001) printed antiinterleukin monoclonal antibodies in the bottom of a prototype shallow, vacuum-formed, 96-well polypropylene plate (Figure 6.9). The plastic was surface modified with acyl fluoride groups for rapid and efficient covalent attachment of the antibodies. 

Expose the abdominal cavity through a midline incision and locate para-aortic lymph nodes (Fig. 14.1B). Subsequently, surgically remove the lymph nodes and place them in DPBS containing 300 ptg/ml D-luciferin in 96-well polypropylene plates. 

Binding assays were set up in 96-well polypropylene plates. All compounds were first diluted to 40 times final concentration in 100% DMSO and then threefold serial dilutions were made in 100% DMSO. Full-length Hsp90 isoforms were diluted to two times their final concentration in PBS... 

The open plate and frame filter presses used typically have cast iron frames with polypropylene plates that give excellent life. Filter clothes are usually constructed of synthetic materials such as polypropylene felt, rather than natural fibers such as cotton. Plastic tools must be used to clean cake from the clothes to avoid... 

Enzyme working solution (10 pL, as determined above or as specified by the reagents and solutions ) is pipeted into wells Al-Hl and A2-H2 of a flat-bottomed, 96-well fluorescence plate. Using 8 tips on a 12-channel pipeter, 190 pL of substrate solutions in the polypropylene plate are transferred simultaneously to the corresponding well of the fluorescence plate with enzyme. 

Transfer 5.5 pL from all wells of the polypropylene plate with DMSO solutions to a fresh polypropylene plate. Fill a reservoir with at least 25 mL of assay buffer with substrate. To all the wells of the new plate, add 215 pL of assay buffer with substrate and mix. This procedure dilutes the inhibitors 1 40. 

Instruments/equipment. Tomtec Mach 2 Harvester, Wallac LKB 1205 Betaplate liquid scintillation counter, 96-well polypropylene plates (Costar). 

Characterising glass fibres in an injected moulded polypropylene plate (a) Fibre length distribution (Mine, R J. et aL, Compos. Sci. Tech., 62, 1445, 2002) (b) theoretical angular distribution (Mine, R J. et al., Compos. Sci. Tech., 64, 1081, 2004) Elsevier. 

To prepare films, about 17 g of aqueous suspension (as described above) was poured in to a polypropylene plate (8x8 cm) and left to dry overnight at an ambient temperature (23-24°C) and finally for 3 h in a oven at 50 C. Films were cooled to room temperature before being peeled off the plates. The prepared blends and their compositions are provided in Table 2. 

It can be seen that the same polypropylene matrix leaches a higher content of impurities into methanol when compared with water. This indicates that for use in a direct methanol fuel cell another type of polymer might be more appropriate, even though such polypropylene plates successfully operate in PEM fuel cells. Due to the chemically corrosion stable nature and the low additive content of PPS, it can be supposed that such plates are an appropriate choice for use in direct methanol fuel cells. At the time of writing, the authors apply a simultaneous ex situ test in methanol with such PPS-bonded bipolar plates. 

Hine, P.J., Duckett, R.A., Ward, I.M. etal. (1996) A comparison of short glass fiber reinforced polypropylene plates made by conventional injection molding and using shear controlled injection molding. Polym. Composite., 17,400. 

Influence of cooling rate on the weathering resistance of extruded polypropylene plate [591]... 

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