Wire mesh method/technique

The gas dispersion tube technique is much easier to assemble and use than the dialysis membrane/wire mesh basket assembly, but it gives similar release profiles for 5-FU from EHCF or copolymers of EHCF with either HA or HHA. The gas dispersion tube method only requires 0.1 gram of material for an accurate kinetic profile of these prodrugs. The small gas dispersion tubes are useful for studies involving powders, but pellets would not fit into these tubes. The large size gas dispersion tubes or the wire basket technique could be used for powders or pellets, and can accommodate larger sample sizes. In summary the gas dispersion tube technique is reproducible, easy to assemble, easy to use, can distinguish polymers with different release rates, and the results can be correlated with our earlier studies. 

Various types of equipment and techniques have been employed to suppress foam formation in biological and process equipment. These include both chemical and mechanical methods. Chemical methods include various defoaming chemicals (silicone oils, non-ionic surfactants, etc.) Mechanical methods employ sprays, wire mesh elements, heat, live steam injection, air or steam-operated ejectors, sonic horns, vacuums, centrifuges, and the use of large re-... 

Sieving is probably the most widely used and abused method of particle size analysis because the equipment, analytical procedures and basic concepts are so deceptively simple. Its popularity is due the relative simplicity of the technique, low capital investment and low level of expertise required to carry out the analyses. Sieve analysis presents three major difficulties [1]. With woven wire sieves, the weaving process produces three-dimensional apertures with considerable tolerances, particularly for fine-woven mesh [2]. The mesh is easily damaged in use [3]. The particles must be efficiently presented to the sieve apertures. 

---