Milligram percent

Milligram percent, mg% number of milligrams of a constituent (solute) in 100 mL of preparation (solution)... 

Lactose-fermenting yeasts contain the following vitamins in milligrams percent on a dry basis vitamin A, traces Bi, 12.8 B2, 4.4 nicotinic acid, 8.3 ascorbic acid, 7.8 and provitamin A, 40.5 (Springer... 

Milligram percent is often used in clinical laboratories. For example, a clinical blood sugar value of 225 means 225 mg of glucose per 100 ml of blood serum. 

Clinical chemists sometimes prefer to use the unit milligram percent (mg%) rather than ppm for small concentrations. This is defined as milligrams of analyte per 100 g of sample. The sample in Example 5.14 would then contain (3.6 X 10 mg/2.6 g) X 100 mg% = 0.14 mg% zinc. 

Infrared internal reflection spectroscopy was used by Brash and Lyman to study the adsorption of the plasma proteins, albumin, y-glcbu-lin, and fibrinogen, on a variety of hydrophobic polymer surfaces. The results indicated that all the proteins investigated behaved rather similarly on a variety of hydrophobic surfaces. Under static conditions the proteins appeared to be rapidly adsorbed as monomolecular layers from solutions varying in concentration from a few milligram percent to the concentration levels of normal plasma. They deduced these monolayers to be closely packed arrays in which the protein molecules appeared to retain their native globular form. 

In the older medical literature, concentrations are often expressed as mg/100 ml this has been called completely incorrectly milligram percent, and has been abbreviated as mg%. Reputable scientific journals do not permit this designation it should be avoided under all circumstances. If for some reason concentrations are expressed in terms of weight per volume instead of moles per volume, the internationally acceptable designation of parts per million should be used 1 mg to 100 ml corresponds approximately to 10 ppm-. 

Leaded Paint. The lead content of paint on the interiors of houses was determined by x-ray fluorescence analyzers. The same location was used in each room of each individual house. Fifty percent of the determinations were made on painted walls, and the other fifty percent were made on the trim paint. The precision of these instruments is +. 2 milligrams per square centimeter. Therefore, values of. 7 or greater are considered to represent at least 0.5 mg/cm. ... 

The interplay between the chemical and biological properties of the threat agent, on the one hand, and the specific attack scenario, on the other, can influence the lethality of the attack. Table 2-2 shows the relative respiratory toxicities (expressed as the lethal concentration of toxin at which 50 percent of test animals are killed, or LCT50, in milligrams per minute per cubic meter) of a variety of toxic gases compared with chlorine gas, which was used as a chemical weapon in World War I. According to Table 2-2, the nerve agent sarin (GB) has a respiratory toxicity approximately 100 times that of chlorine, while sulfur mustard (HD) is about 7 times more toxic. However, the lethality of an attack... 

NOTE LCT50 is the lethal concentration of toxin at which 50 percent of test animals are killed, in milligrams per minute per cubic meter. 

The Vmax is a special point. At Vmax, the velocity does not depend on the concentration of substrate. Most assays are performed at substrate concentrations that are near saturating (the word near is usually used because Vmax, like Nirvana, is approached, not reached). For practical people, though, 99 percent of Vmax is as good as Vmax. The Vmax and v have exactly the same units. The Vmax conceals the dependence of the velocity on the concentration of enzyme. It s buried in there. If Vmax is expressed in units of micromolar per minute ((xM/min), then doubling the enzyme concentration doubles Vmax in contrast, if Vmax (and v) are given in units of micromoles per minute per milligram [p,mol/(min mg), i.e., specific activity], the normalized velocity and Vmax won t depend on enzyme concentration. 

In contrast, the direct detection technique for 14C can count approximately one percent of the 14C atoms that are present in a 200 pg sample with virtually zero background in times that are of the order of a few hours. Thus, for milligram quantities of carbon, the improvement in sensitivity of direct counting over radioactivity is of the order 7.2 x 10s. 

Calcium retention is dependent on two factors, absorption and excretion. Normal subjects have been observed to have apparent calcium absorptions of 23 (sd = 12) to 27 (sd = 17) percent of the calcium from normal diets (21,22). For 20 women aged 55 to 65 consuming 629 (se = 92) milligrams dietary calcium daily, the apparent absorption was 32.1 (se = 1.9) percent (23). An apparent calcium absorption of 29.5 percent (n = 130) may be calculated from data published by Heaney et al. (15). Apparent absorption values from 29 to 42 percent may be calculated from data published by Linkswiler (24,25). However, much lower apparent absorption values of 6 to 15 percent may also be calculated from data published from the same laboratory (26). Although there is considerable variability in the apparent absorption values determined from many studies, a conservative value of 25 percent seems realistic for normal people consuming typical diets. 

What is the percent of CaC03 in an antacid given that a tablet that weighed 1.3198 g reacted with 50.00 mL of 0.4486 N HC1 that subsequently required 3.72 mL of 0.1277 N NaOH for back titration Also report the milligrams of CaC03 in the tablet. 

Suppose the researcher involved with the sodium ion concentration study of Sections 15.1 and 15.2 becomes interested in the wine-making process we have been discussing in Sections 15.3 and 15.4. In particular, let us assume the researcher is interested in determining the effects on the percent alcohol response of adding 10 milligrams of three different univalent cations (Li, Na, and K ) and 10 milligrams... 

HERP value is the lifetime daily exposure rate experienced by humans (in milligrams per kilogram of body weight) that lowers, by one-half, the percent of tumor-free animals in a bioassay experiment over a standard lifetime of the animal. Asterisks imply that the substance acts as a promoter of cancer and is not genotoxic itself. 

Six filters for each level of concentration were spiked using variable volume pipettes. The following volumes 13, 25, 50, 100, and 200 yL of the 10 mg/mL solution yielded 0.13, 0.25, 0.50, 1.00 and 2.00 mg of sodium dichloroisocyanurate dihydrate on a filter, respectively. When the filter was dry, the "filter extraction" section was followed. The end-point volumes were converted to milligrams from the calibration curve and the percent recoveries were calculated. 

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