Population growth relationships

Contois, D. E. J. Gen. Microbiol. 21 (1959) 40. Kinetics of microbial growth. Relationship between population density and specific growth rate of continuous culture. 

Reducing population growth would be another way to address the problem of diminishing wildlands. After all, fewer people on Earth would mean that less land needs to be used to grow food. But who decides how to go about this Some countries oppose birth control and others are encouraging their citizens to reproduce, even providing incentives to do so (Chivers 2006). Clearly, there are a host of social, economic, and political issues that mediate the relationship between agricultural production, human nutrition, and habitat protection. 

Schultz, T.W., Lin, D.T., Wilke, T.S. and Arnold, L.M. (1990). Quantitative Structure-Activity Relationships for the Tetrahymena Pyriformis Population Growth Endpoint A Mechanism of Action Approach. In Practical Applications of Quantitative Structure-Activity Relationships (QSAR) in Environmental Chemistry and Toxicology (Karcher, W. and Devillers, J., eds.), Kluwer, Dordrecht (The Netherlands), pp. 241-262. 

FIGURE 2.1 Relationship between estimated world population growth and amount of time required to circumnavigate the globe (similar to Murphy and Nathanson 1994, with current population estimates from U.S. Census Bureau 2007). 

Scientists use spreadsheets to organize, analyze, and display data. For example, conservation ecologists use spreadsheets to model population growth and development, apply sampling techniques, and create statistical distributions to analyze relationships. Spreadsheet use simplifies data collection and manipulation and allows the presentation of data in a logical and understandable format. 

By being stable, these chemicals tend to parallel such natura1 economic patterns as population growth, gross national product, construction, etc. These relationships are much more pronounced with the heavy inorganics than with the newer chemical products. 

Williams, P.J. LeB., 1970. Heterotrophic utilization of dissolved organic compounds in the sea. I. Size distribution of population and relationship between respiration and incorporation of growth substrates. J. Mar. biol. Assoc. U.K., 50 859—870. 

Prospective, cross-sectional study Patients shorted and lighter than reference populations. No relationship between protein and calorie intake and growth retardation... 

The structure-activity relationships between toxicity (log BR), monitored as cell population growth of Tetrahymena pyriformis and a number of molecular descriptors including the log 1-octanol/water partition coefficient (log Kqw). the electronic field effect (F), and the ability to donate hydrogen (Hd) have been examined for a series of para-substituted phenols. The equation log BR = 0.6849 (log Kq ) + 0.9439 (F) + 0.3373 (Hd) -1.3764, n = 29 has been found to be a good model for these derivatives and explains 91.1% of toxicity variability. Four derivatives, however, were found to lie outside the 95% confidence interval. The nitro, amino, and azophenyl derivatives were more toxic than predicted and the carboxyl derivative was less toxic than predicted. 

Some of the remarkable properties of the golden section, with relevance to chemistry, are summarized in the introductory chapter of this volume. Perhaps most surprising is the close relationship between golden ratio and the Fibonacci series, which was first formulated to model the population growth in a rabbit colony. 

It is exactly this sort of relationship that has been used to describe the simplest sort of population growth in chapter 1. The rate at which a population produces children will be (in the absence of constraints produced by a limited supply of food or space) directly proportional to the number of individuals in the population. The more individuals there are to produce offspring, the more offspring there will be and an exponential growth of the population can be expected. This is discussed in chapter 1 with some examples in the context of the general application of kinetic arguments in relation to biological problems. 

Figure 3. Relationship between population growth and ease of travel...

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