Cargille liquids

When mounted in Cargille liquid, 1.528 RI gypsum has a blue outline with central screening on the dispersion screening device. This is a good method for finding small amounts of raw gypsum in stucco. 

Sometimes we may want to know whether the limestone is dolomite or calcite. This is very easy using dispersion staining. When mounted in Cargille liquid 1.660 with the central stop in place, each dolomite particle will turn yellow or orange at one point as the stage is revolved while each calcite particle will turn blue. 

If a constant volume is used it will also cut down on the error. A small scoop was fashioned by flattening the end of a length of brass rod and drilling a small depression. Two scoopfuls make a specimen, which is then dispersed in a drop of 1.528 Cargille liquid. A field is examined with plain light, and of course all the impurities stand out from the almost invisible gypsum. When a likely particle... 

A series of papers with first systematic studies of SNPs in selected genes have been published recently (Cargill et al., 1999 Halushka et al., 1999, Hacia et al., 1999). In all studies high-density variant detector arrays (Chee et al., 1996 Lipshutz et al., 1999) were used to detect SNPs in PCR products. In the study denaturing high-performance liquid chroma-... 

For dispersion staining analysis, it is necessary to have quality high dispersion liquids. One source is R. P. Cargille Laboratories, Inc. (37). 

CHARACTERIZATION. Melting points were determined on an E. I. DuPont Series 99 Thermal Analyzer at 20°C/min. Inherent viscosities of polyamic acid solutions were obtained at a concentration of 0.5% (w/w) in DMAc at 35°C. Glass transition temperatures (T ) of the fully cured polymer films were measured by thermomechanical analysis (TMA) on a DuPont 943 Analyzer in air at 5°C/min. Films fully-cured at 300°C were tested for solubility at 3-5% (w/w) solids concentration in DMAc,N,N-dimethylformamide (DMF), and chloroform (CHCl-j). Solubilities at room temperature were noted after periods of 3 hours, 1 day and 5 days. Refractive indices of 1 mil thick films were obtained at ambient temperature by the Becke line method (11) using a polarizing microscope and standard immersion liquids obtained from R. P. Cargille Labs. 

A set of refractive index liquids can be purchased from R. P. Cargille Laboratories. You could make up your own set of liquids and calibrate them on a reffactometer, but if you do a great amount of microscopy 1 highly recommend buying a set of calibrated liquids. 

These composite liquids consist of a dispersion of dense metal particles (e.g., ferrosilicon, mercury) or powdered heavy minerals (e.g., magnetite, barite) into a liquid (e.g., water, bromoform). Such heavy suspensions are either used in the laboratory or for commercial benefit or in the field . Certain companies (e.g., Cargille New Jersey, USA) have commercialized dense liquors with densities up to a specific gravity of 7 but they are not stable, are opaque and can only separate minerals with large grain of few millimeters satisfactorily. However, Desnoes inspired by the work of Orphy prepared suspensions of microdroplets of mercury (10 pm) into bromoform that provided better results. 

If we assume a 1% per year increase in yield for corn (versus 3% per year over the past 50 years) and no change in the planted acreage, then the annual increase in corn produced is about 100 million bushels per year, or over 2 million metric tons of new com every year. The Cargill-Dow Polymers plant being opened in Blair, Nebraska, in late 2001 will produce 140,000 metric tons per year of polylactic acid from approximately 200,000 metric tons of corn. That is, a new large scale plant for bioplastics wiU only use about 10% of one year s increase in the com crop. Thus it seems unlikely that biomass use for chemicals and materials will really have much effect on grain supplies and prices. However, this does not hold frue for new large scale liquid fuel uses of biomass. 

Cargille Laboratories, Specifications of Cargille Optical Liquids, www.cargille.com... 

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