Option filtering

Drying. Drying is an optional step. One factor in whether drying should be done is the time period before the next use of the equipment. Equipment that is to be used immediately (within a few hours) may not have to be dried, particularly if the equipment is effectively drained to minimize any dilution effect of residual rinse water or solvent. However, the effect of residual water on microbial proliferation during extended storage is a significant issue. Options for drying include heated (and optionally filtered) air and the use of a final alcohol/water rinse. The final alcohol/water rinse may also further reduce the bioburden due to the antimicrobial action of the alcohol. This use has to take into consideration the flammability of such a mixture. 

Optional filter the DNA through a 0.22-pm Acrodisk filter (Gelman, Ann Arbor, MI) immediately prior to injection. 

The PubChem structure search tool enables one to query and subset PubChem Compound by a variety of chemical structure search types and optional filters. The chemical structure search service may be directly accessed using the URL ... 

The shutter generally carries the holmium oxide filter (used for the calibration of the photodiode array) and the opaque surface used for the measurement of the dark current. Other optional filters can be included in order to afford fast built-in verification procedures for the spectrometer working parameters (e.g., neutral density glass filter for verification and calibration of absorbance scale in the visible domain). 

Optional) Filter Solutions A and B through a 0,2 micron Millipore filter. This will remove dust and sterilize the buffers. Do not autoclave the buffers because acetonitrile and ammonium bicarbonate are volatile. 

The basic coextrusion process consists of the generation of two or more melt streams and their confluence while in the melt phase. The number of separate extrusion systems is determined by the number of polymer types. This is typically 2, but occasionally 3 and exceptionally up to 10. Each polymer type to be incorporated in the structure is separately melted, pressimized, and (optionally) filtered in parallel extrusion systems before flowing into the coextrusion hardware. The optimum method of bringing the separate melts together depends primarily on their respective flow behaviors. The melt layers must remain distinct but well bonded in the process from the point(s) of confluence through to sohdification. There are basically two hardware configurations in use for common polymers the multi-manifold die and the injector block. Combinations of the two are also possible for complex structures (8,9). 

Note The carotenoid concentration is approximated by diluting and measuring the absorbance at 450 nm on a spectrophotometer where 1 AU = 4 mgA 3a. (Optional) Filter through 0.45-pm filter prior to injection. 

After validation and optional filtering, the user is ready to calculate derived quantities and statistical values. Following are the connnonly calculated derived quantities from PIV data ... 

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