摘要:
A turner for quickly, easily, and aesthetically turning over and aerating and thickening a settled or compacted layer of an aggregate landscaping mulch material, and a method for doing so. The present turner includes an elongate cylindrical barrel having an outer cylindrical surface having a diametrical extent of less than about 5 inches and a plurality of elongate projections extending generally radially outwardly from the cylindrical surface at spaced locations thereon. The turner includes a handle supporting the cylindrical barrel for rotation about a cylindrical axis thereof. The present method includes holding the handle to push or pull the cylindrical barrel across a region of the layer of the landscaping mulch material to rotate the barrel such that the projections will penetrate into the mulch material and lift and reorient portions thereof to thicken the layer, without substantially disturbing the underlying surface.
摘要:
A device for the dialysis of a sample includes a hermetically sealed sample chamber formed by a gasket with dialysis membranes affixed to each side in facing relationship. The gasket is impermeable to the sample being dialyzed, but is penetrable and reusable such that a sample introduction mechanism can be inserted through the gasket into the chamber, and then withdrawn without sample being permitted to leak. The device is fitted into a rigid housing containing windows and at least one port parallel to the dialysis membranes for directing the sample introduction mechanism into the gasket. The housing includes at least one pressure ridge for assisting in hermetically sealing the sample chamber and air chamber at one end for causing the device to float in an upright position when immersed in a dialysate.