The disclosure is generally directed to a wheel-mounted, centrifugally activated, air compressor that will automatically inflate an inflatable vehicle tire back to the proper pressure level when small under-inflation situations occur. When a graphic processing unit is lost when a screen saver desktop is activated, the buffer containing the video frame that is currently being processed is discarded and a device is attempted to be created on the screen saver desktop which enables continued graphic processing. Thus, in certain example instances, the need for tacks ) proximate the threshold can be reduced andor eliminated. Such applications include a modified polysaccharide having up to about 70 mole % carboxyl groups per mole of polysaccharide ASU and up to about 20 mole % aldehyde groups per mole of polysaccharide ASU. Focusing from infinity to a close-range object is carried out by moving only the 1B lens group G1B to the object. This invention also provides pharmaceutical compositions containing such compounds; methods for treating bacterial infections in a mammal using such compounds; and processes and intermediates useful for preparing such compounds.