D-Pantothenyl alcohol, also called ortho-vitamin 85, is an important nutrition suppled substance. It has been widely applied in the field such as medicine, cosmetic, foodstuff, feed additive, and so on. The preparation of D-pantothenyl alcohol and the optimization of key factor are discussed mainly in this paper. It mainly includes three section.In the first section, with formaldehyde, isobutyl aldehyde and diethyl oxalate as the starting materials, D-pantolactone is prepared via three steps including condensation, catalytic hydrogenation and physical resolution. The specific rotatory power of the product is consistent with imported product.

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Ortho introduces The Coombs Test to identify sensitized Rh-negative patients.

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This dissertation gives the damping iteration method and geome-tric-mean tracing method, both based on inversion of observed ground-water level data, and also gives the proportional iteration (or ortho-gonalization) method based on inversion of hydrogeologic gradient data.

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Both electronic and steric effects were observed for the homo coupling of aryl iodides. Electro-withdrawing and ortho substituents gave desired products in low yields.

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When 5 is the set of all symmetric and ortho-symmetric matrices, we have first discussed the construction and eigen-pair character of this kind of matrics.

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Ortho-dichlorobenzene and certain xylenols have the weak band on the short wave-length side of the main band.

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Results Synergized by microwave under the power of 210W, chlorhexidine and benzalkonium bromide represented weak activity for killing Bacillus subtilis var. niger, glutaraldehyde and ortho-phthalaldehyde presented obvious enhanced activity.

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The sound coating for EPC is composed of: 100 percent of quartz sand, 4 percent of Na-sulfuryl bentonite, 3 percent of Na2CO3 (of Na-sulfuryl bentonite), 2.5 percent of white-latex, 0.5 percent of CMC, 0.05 percent of twelve alkyl phenyl sulfonic Natrium, 0.02 percent of ortho octa hydrin, and the binder is 6%PVA, NaF is except, the perfect position of pouring is at the bottom of casting.

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By taking ortho-hexahedron as the basic form of abrasive grains that are distributed randomly on the grinding wheel base, the model of virtual grinding wheel is built. Mathematic model of interference between the abrasive grains and the workpiece is given.

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