Drugs Behaviour and the Brain Chemistry

Drugs affect the hundreds of billions of molecules that make up our brains, our 'universe within'. Molecules serve as chemical 'messengers' which circulate through the body until they encounter other molecules on the surface of the cells which fit their specific configuration. The molecules carrying information- are called 'neurotransmitters'. They react with other molecules called 'neuroreceptors', which modify the response to the information in the neurotransmitters by interacting the way a key fits into a lock. Thus, information is passed from cell to cell. Molecular'recognition sites' integrate the individual cells of the body, and together they make the person a unique individua

A Neoclassical Growth Model with an Environment Sector

Current discussions often link economic growth as a causative factor in the increase of pollution. Growth in the economy has a number of causes. These include technological innovation, resource discovery and population growth along with the most widely discussed, investment. Economic growth in its advanced stages can cause severe depletion of raw materials, environmental pollution from energy use, and overtaxing of the environment\u27s capacity to absorb and recycle waste products. A simple solution to growth related pollution would be to reduce the rate of growth and therefore reduce pollution. Herein lies a dilemma. Edwin L. Dole has written that reducing production would cause massive unemployment. Maintaining full employment then, requires the economy to grow at four percent a year. Reduction in population growth and improvement in pollution reducing technology are possible alternatives he offers to reducing pollution. Use of pollution abatement equipment is another alternative in the attempt to return society to an optimum welfare position. Abatement equipment is used to eliminate or reduce residuals in the environment. Residuals may be recycled, assimilated into the environment, or reduced by means of technologically better production techniques. Formation of a stock of pollution abatement equipment will require either increased saving (and therefore investment) and/or substitution of other (productive) capital to pollution abatement use. Since capital is now required for productive and non-productive purposes, the formation of abatement capital will have a definite influence on the process of capital accumulation. The most obvious result will be smaller increases in productive capital than would be possible with no requirement for investment in abatement equipment. Through this mechanism there will be an impact on the growth of income and consumption. Presently there are few economic growth models which formally take into account residual flows and investment in pollution abatement capital. One such model was developed by Ralph C. d\u27Arge. This is a Harrod-Damar type model which includes variables for waste flow, abatement capital and changes in pollution. The purpose of this paper is to develop a growth model that incorporates residual flows and pollution abatement capital using a neoclassical growth model which is less restrictive in nature than, that set forth by d\u27Arge. The following chapters will include a discussion of the d\u27Arge model, presentation of the neoclassical model, and finally a comparison of the results obtained in the two models

Receipt from Henry Van Wagner

https://digitalcommons.salve.edu/goelet-new-york/1142/thumbnail.jp

XXV. Epipharyngeal Lympho-Sarcoma in a Boy

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Nitrogen fertilization of soybeans

Cover title.Digitized 2007 AES.Includes bibliographical references (page 23)

Status Survey of the Arkansas Endemic Crayfish, Fallicambarus gilpini Hobbs and Robinson

Fieldwork was conducted during 2002-2003 on the rare, Arkansas endemic crayfish, Fallicambarus gilpini Hobbs and Robison. Collections at 87 localities revealed this crayfish at 8 sites, all located in southeastern Arkansas in Jefferson and Cleveland counties which significantly expands its known range. Fallicambarus gilpini was generally found inhabiting roadside ditches and areas of standing water where it was always taken from upslope areas away from the static water. A sex ratio of 1:1.3 males to females was determined for this species. Ovigerous females were collected from burrows on 20 March 2003. A conservation status of threatened is recommended for this crayfish species