High assays

Manufacture. The manufacture of sulfur dichloride is similar to that of sulfur monochloride, except that the last stage of chlorination proceeds slowly and must be conducted at temperatures below 40°C. The preparation of a high assay sulfur dichloride requites special techniques, eg, continuous chlorination duriag distillation or distillation with traces of phosphoms trichloride or phosphoms pentasulfide [1314-80-3] (162—164). Cmde product containing 80 wt % sulfur dichloride to which is added 0.1 wt % phosphoms trichloride can be distilled to yield a 98—99 wt % pure sulfur dichloride, which can be stored for weeks at room temperature without appreciable change. 

Calcium Hypochlorite. High assay calcium hypochlorite [7778-54-3] was first commercialized in the United States in 1928 by Mathieson Alkali Works, Inc. (now Olin Corp.) under the trade name HTH. It is now produced by two additional manufacturers in North America (Table 5). Historically, it usually contained about 1% water and 70—74% av CI2, so-called anhydrous product, but in 1970, a hydrated product was introduced (234). It is similar in composition to anhydrous Ca(OCl)2 except for its higher water content of about 6—12% and a slightly lower available chlorine content. This product has improved resistance to accidental initiation of self-sustained decomposition by a Ht match, a Ht cigarette, or a small amount of organic contamination. U.S. production in the 1990s consists primarily of partially hydrated Ca(OCl)2, which is sold as a 65% av CI2 product mainly for swimming pool use. Calcium hypochlorite is also sold as a 50% av CI2 product as a sanitizer used by dairy and food industries and in the home, and as a 32% product for mildew control. 

Pu-241 is the parent from which high assay Am-241 can be isolated for industrial purposes. 93% samples are available. 

Appropriate system suitability is very important for CE assays in a QC environment. It is preferable to define CE-specific system suitability criteria rather than directly adopt system suitability based on HPLC methods. Earlier data from biotech companies showed a high assay failure rate due to inappropriate system suitability criteria. When appropriate criteria were applied in the QC environment, the assay failure rate improved. 

Fig. 2. Chromatography of iodinated human pregnancy-specific /3i-glycoprotein (PSj8,G) on a 40 X 1cm Sephadex G-IOO column eluted with 50 raM phosphate buffer, pH 7.5. Binding of the tracer in the presence and in the absence of an antiserum to PS/SiG is shown by the dashed lines, the separation procedure being addition of polyethylene glycol as described in Table II. Earlier fractions, containing aggregated I-labeled PS iG, give an unacceptably high assay blank value. Selection of the later fractions yields material with an acceptable blank and also shows the best distinction between blank and zero standard. From data kindly supplied by A. T. Al-Ani.

In terms of overall efficiency, chemical precipitation of the bound fraction with ammonium sulfate or polyethylene glycol is often less satisfactory than systems such as second antibody. In particular, they tend to yield high assay blank values. However, for many routine assays this defect is compensated by their high level of practicality. 

Features Pigment grade functional filler high assay, high brightness, fine whiteness... 

CAS 772743-7 EINECS/ELINCS 231-7844 Uses Pigment, filler for powd. and industrial coatings Features Pigment grade functional filler high assay, high brightness, fine whiteness... 

Thin layers on microtiter plate wells The microtiter plate format is universally employed in biological immunoassays such as ELISA and enables a very high assay throughput, in particular when combined with automation. Thus, thin layers ofMIPs in microtiter plate wells are of immense interest for MIAs involving colorimetric or fluorescence detection. Two approaches have been described the entrapment of 2,4-D-imprinted vinylpyridine/TRIM microspheres in films of polyvinylalcohol hydrogel [53] and the preparation of imprinted poly-3-aminophenylboronic acid and related conjugated polymers which precipitate as films on the microwell surface [19,54]. The polyvinyl alcohol composite films have been used in combination with... 

Rationale for Sprinkler Operation in a High Assay Gaseous Diffusion Cascade, AT. R. Yates (ONWI) R. S. Denning. R. G. Jung (BCD... 

As part of an effort to develop a final safety analysis report of the Portsmouth Gaseous Diffusion Plant, operated by Goodyear Atomic Corporation, criticality safety studies of the high-assay portion of the cascade were conducted. An event of particular interest to the safety analysis, which occurred several years ago, is described and analyzed herein. 

One of the major concerns of nuclear criticality safety is the unplanned accumulation of a significant mass of well-moderated fissile materiaL Events of this type typically have a low probability of occurrence, are rarely uncovered in a safety analysis, and may or may not lead to a critical excursion, depending on a variety of factors. In 1973, such an unplanned accumulation of a significant quantity of high-assay uranium occurred as a well-moderated oil-uranium mass within cascade equipment. The analysis that follows shows why criticality did not occur and examines the effects of uranium density and depth of material on keff. 

This lAC approach offers satisfactory sensitivity (LOD for FA 6.8 ng), comparable with those reported previously, with a wide dynamic range, four orders of magnitude (dose response curves obtained from lAC columns are exhibited in Figure 23.11). With its acceptably sensitive LOD, reusability, portability of the assay procedure, high accuracy and precision [coefficient of variation (CV) < 10%], cost-effectiveness and high assay speed (analysis times <30 min), this optimized liposome-based lAC assay should allow the... 

According to Reilly Industries, the high assay of this activator (85-90% pure compared with <40% for earlier impure versions of dihydropyridines) gives the following benefits ... 

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