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At the lowest DNA concentrations necessary for phase separation ( 100-200 mg / ml ) , a weakly birefringent , dynamic , " precholesteric " mesophase occurs with microscopic textures intermediate between those of a nematic liquid crystal and a true cholesteric phase first . At slightly higher DNA concentrations ( 200-300 mg / ml ) , a second mesophase forms that is a strongly birefringent , well-ordered cholesteric liquid crystalline phase with a concentration-dependent pitch varying from 2 to 10 micrometers . Kestrel ( Sparrow Hawk ) - A beautiful silicon rendition of the American kestrel , drawn by Lynn Mahnke , was incorporated into a Hewlett-Packard numerically-controlled oscillator / mixer integrated circuit . No endorsement of these products is intended , nor is criticism of unnamed products implied . Secretary Weinberger is , as all of you know , a great friend of the military and someone you can only call a great American . Venezuela claims that at $ 50 per barrel , a portion of the Orinoco tar sands becomes commercially viable , enough to bring the country 's proven reserves up to 312 billion barrels . Senator Boxer 's ( D ) amendment to the Interior Appropriations bill , co-sponsored by Senator Snowe ( R ) and others , prevents the Environmental Protection Agency from using any funds to either conduct human pesticide tests or use data from similar tests submitted by pesticide companies for a year . There are a wide choice of objectives and eyepieces , enhanced with attachment lenses and coaxial illuminators that are fitted to the microscope as an intermediate tube . According to him , the council does not support any political party : " We have nothing to do with parties , nor have we set up one . MTBE , a gasoline additive that has polluted an estimated 1,861 drinking water systems in at least 29 states , is a possible cancer-causing chemical .