Determinants of levels

Rider JA, Moeller HC, Puletti EJ. 1966. Continuing studies on anticholinesterase effect of methyl parathion in humans and determination of level of incipient toxicity of OMPA [Abstract]. Fed Proc 25 687. 

Plasma consists of water, electrolytes, metabolites, nutrients, proteins, and hormones. The water and electrolyte composition of plasma is practically the same as that of ail extracellular fluids. Laboratory determinations of levels of Na, K+, Ca, CL, HC03, PaC02, and of blood pH are important in the management of many patients. 

Oehme, M., M. Schlabach, K. Hummert, B. Luckas, and E.S. Nordoy. 1995. Determinations of levels of polychlorinated dibenzo-p-dioxins, dibenzofurans, biphenyls and pesticides in harp seals from the Greenland Sea. Sci. Total Environ. 162 75-91. 

Exposure Levels in Humans. The database for -hexane exposure levels in humans is limited to a few older detections of -hexane in breast milk and determinations of levels in body fluids and alveolar air collected in foreign countries. A more current and complete database would be helpful in determining the current exposure levels, thereby permitting the estimation of the average daily dose associated with various scenarios (e.g., living near a hazardous waste site). Since -hexane is rapidly metabolized within the human body, further studies correlating levels in the environment with the levels of metabolites and biomarkers in humans would be helpful. This information is necessary for assessing the need to conduct health studies on these populations. 

Drawing of blood samples for determination of levels of alcohol and THC. During this phase, there were a few minutes to relax or attend to bodily functions. 

These criticisms of the Smyth et al. (1942) study have also been noted by NTP (1986) and ACGIH (1986). Given the uncertainty regarding the results and the exposure levels reported by Smyth et al. (1942), it is inappropriate to consider this study for the determination of levels of significant exposure. 

Determinations of "Levels of Concern" of additives, therefore, are based on ... 

Fourth-derivative UV spectrophotometry was applied for the simultaneous determination of levels of 21 and its sulfoxide impurity (91FES979), and second-derivative UV spectrophotometry for that of 21 and furprofen (94FES527). A fluorometric method was developed for determination of the level of 21 in biological fluids (89MI16). 

Determination of levels of residual substances and calculation of 100% mass transfer to food. Measurement of levels is usually needed for monomers, but in the case of additives this can be the level added to the polymer. 

Many analytical methods may be used for the determination of levels of ammonia. A discussion of these methods is beyond the scope of this document. For a review of the methodology for determining ammonia in water and air, see MacCarthy et al. (1987) and Fox (1987), respectively. 

Environmental sampling for the field trial was guided by three aims 1) establishment of estimates of exposure which allow comparison with other field studies 2) determination of levels of pesticide and tracer in the environment of the worker and 3) evaluation of the environmental stability of the tracer. 

D.L. Phillips, H. Lui, D. Pan, and H. Corke, General apphcation of Raman spectroscopy for the determination of level of acetylation in modified starches Cereal Chem. 76,439-443 (1999). 

European Commission (2002b), Commission Directive 2002/70/EC of 26 July 2002 establishing requirements for the determination of levels of dioxins and dioxin-like PCBs in feedingstuffs [available at http //europa.eu.int/eur-lex/en/ archive/2002/l 20920020806en.html]. 

Mart, H. W. Niirnberg and H. Riitzel, Trace metal distribution in the German Bight and North Sea coastal waters, Mar.Chem., in press. Mart, H. W. Niirnberg, P. Valenta and M. Stoeppler, Determination of levels of toxic trace metals dissolved in sea water and inland water by differential pulse anodic stripping voltammetry,... 

Gas Chromatographic Determination of Levels of Aldadiene in Human Plasma and Urine Following Therapeutic Doses of Spironolactone J. Chromatogr. 55(2) 249-253 (1971) CA 74 107687j... 

Towards this objective, a theoretical model has been developed and based on this model, the response of the system has been estimated using the indigenously developed computer code CAPCIS (Code for Analysis of Passive Containment Isolation System). The numerical analysis performed takes into account the pressure transient because of the postulated initiating event (PIE) and the solution includes determination of levels in the two compartments of the isolation tank and the cumulative volumetric spill into the ventilation duct at any point of time during the transient. A case of a 200% break in inlet header is considered for the analysis and the pressure transient for the considered PIE is numerically simulated as shown in Fig. 10. Figure 11 shows the volumetric spillover during the entire transient. 

AS 2836.7-1998. Methods of testing surgical dressings Surgical dressing materials — Method for the determination of level of surface-active substances. 

Models that simulate dyeing conditions in which no dye migration occurs, and fluid flow takes place only by a bulk mechanism. These models are based upon explicit mathematical equations that allow determination of levelness within a package for a worst case dyeing scenario. Since a number of simplifying factors are used in the model, the equations deflned by these models are generally simpler. 

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