Distribution factors controlling

Degens, E. T. and Mopper, K. (1976). Factors controlling the distribution and early diagenesis of organic material in marine sediments. In "Chemical Oceanography" (J. P. Riley, ed.), Vol. 6, pp. 59-113. Academic Press, New York. 

The lEP provides the monitoring fi amework to characterize the status and trends of Delta aquatic ecosystems. The lEP strives to provide information on the many factors that affect ecological resorrrces in the Delta. Key near-term goals for the lEP include (1) collecting and analyzing data needed to understand factors controlling the distribution and abundance of selected fish and wildlife resources, (2)... 

The above-mentioned consideration indicates that important factors controlling the precipitations of barite and silica are surface area/water mass ratio (A/M), temperature, precipitation rate constant (k) and flow rate (u), and the coupled fluid flow-precipitation models are applicable to understanding the distributions of minerals in submarine hydrothermal ore deposits. 

Baskaran and Santschi (1993) examined " Th from six shallow Texas estuaries. They found dissolved residence times ranged from 0.08 to 4.9 days and the total residence time ranged from 0.9 and 7.8 days. They found the Th dissolved and total water column residence times were much shorter in the summer. This was attributed to the more energetic particle resuspension rates during the summer sampling. They also observed an inverse relation between distribution coefficients and particle concentrations, implying that kinetic factors control Th distribution. Baskaran et al. (1993) and Baskaran and Santschi (2002) showed that the residence time of colloidal and particulate " Th residence time in the coastal waters are considerably lower (1.4 days) than those in the surface waters in the shelf and open ocean (9.1 days) of the Western Arctic Ocean (Baskaran et al. 2003). Based on the mass concentrations of colloidal and particulate matter, it was concluded that only a small portion of the colloidal " Th actively participates in Arctic Th cycling (Baskaran et al. 2003). 

Palumbo, R. F. (1963). Factors controlling the distribution of the rare earths in the environment and in living organisms, page 533 in Radioecology, Schultz, V. and Element, A. W., Eds. (Reinhold Publishing Corp., New York). 

Rehm, E., M. Schulz-Baldes, and B. Rehm. 1984. Geochemical factors controlling the distribution of Fe, Mn, Pb, Cd, Cu and Cr in Wadden areas of the Weser estuary (German Bight). Veroff. Inst. Meeresforsch Bremerh. 20 75-102. 

The pore-size distribution is the distribution of pore volume with respect to pore size (Figure 3.66). It is an important factor controlling the diffusion of reactants and products in the porous solid and thus an essential property for its characterization. The computation of pore size distribution involves a number of assumptions, and therefore reporting of the data should always be accompanied by an indication of the method used for its determination. 

New applications of zeolite adsorption developed recently for separation and purification processes are reviewed. Major commercial processes are discussed in areas of hydrocarbon separation, drying gases and liquids, separation and purification of industrial streams, pollution control, and nonregenerative applications. Special emphasis is placed on important commercial processes and potentially important applications. Important properties of zeolite adsorbents for these applications are adsorption capacity and selectivity, adsorption and desorption rate, physical strength and attrition resistance, low catalytic activity, thermal-hydrothermal and chemical stabilityy and particle size and shape. Apparent bulk density is important because it is related to adsorptive capacity per unit volume and to the rate of adsorption-desorption. However, more important factors controlling the raJtes are crystal size and macropore size distribution. 

Distribution coefficients (KD) can also be used to gain a better understanding of factors controlling the partitioning of chemicals between solid and liquid phases (53). The affinity of a chemical constituent for particles is described by... 

Smith, J.V.S., Jankowski, J. and Sammut, J. (2003) Vertical distribution of As(III) and As(V) in a coastal sandy aquifer Factors controlling the concentration and speciation of arsenic in the Stuarts Point groundwater system, northern New South Wales, Australia. Applied Geochemistry, 18(9), 1479-96. 

The merit of this definition is that it distinguishes factors controlling the toxicokinetics of the substance (i.e., the rates of uptake, elimination, transformation, and internal distribution) from environmental factors (external to the organism) that control the amount of chemical that can be absorbed by the organism through a specific route of uptake. 

Understanding the factors controlling organic matter turnover is complicated by possible differences in population distributions of organisms responsible for enzyme production and product uptake. Although relationships between enzyme Vmax and bacterial productivity have been reported (Sinsabaugh et al., 1997), correlations between total bacterial numbers or bacterial production and enzyme activities are frequently found to be variable or weak (e.g., Mayer, 1989 Boetius et al., 1996, 2000). Vrba et al. (1992) observed that MUF-a-glucosidase activity correlated with bacterial biomass measured in a freshwater reservoir over the course of three seasons,... 

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