Origin and Nature

A short account of the origin of the different fossil hydrocarbons is necessary to understand the occurrence of nitrogen compounds and their nature. 

It is generally admitted that all these hydrocarbons derive from fossil organic substances synthesized by higher plants on land and by algae and plankton in the ocean, accumulated in depressions, partly modified by the 

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F. Soddy (Oxford) contributions to knowledge of the chemistry of radioactive substances and investigations into the origin and nature of isotopes. 

The above discussion has purposely been presented from a chem viewpoint in order to give a feel for the origin and nature of the wastewater streams. It has been usual to describe them in the conventional terms of BOD, pH, suspended solids, etc, and most of the surveys and permits are couched in these terms, although specific, military-unique parameters would be preferable... 

Sulfur in the Earth s Crust, Its Origin and Natural Cycle (K. H. Wedepohl)... 

The origin and nature of the electronic and steric properties of NHCs, that render them phosphine surrogates, have aheady been discussed in depth in the general introduction of this book. Hence, we will focus our attention on the peculiarities that these properties impart to the metal complexes, and therefore the catalytic species. 

Vaughan, Thomas.Man s spiritual origin and nature - from the writings of Thomas Vaughan compiled by D. J. Williams. Edited by D.J. Williams. Theosophical Publ House, 1941. 

Other scientists took up Oparin s ideas, used them for their own concepts, and tried to form organic molecules from inorganic starting materials. The Mexican scientist A. L. Herrera reported in 1942 in an article entitled A New Theory of the Origin and Nature of Life on his investigations with sulphobes (Herrera, 1942). These are morphological units ( lifelike forms ) which he obtained from reactions between thiocyanates and formalin. Sulphobes are spherical in form, with a diameter between 1 and 100 pm, and can interact with their surroundings thus they can adsorb dyestuffs. In some ways, they resemble the coacervates studied by Oparin and his school (Sect. 10.2.2). 

The objective of this paper was to investigate the anticlastogenic and antitoxic effects exerted by HS of various origin and nature on several monocotyledon and dicotyledon herbaceous plant species treated with different mutagenic and phytotoxic compounds. 

The HS samples used in this work were obtained from the Standard and Reference Collection of HAs and FAs of the International Humic Substances Society (IHSS), with the exception of the HA from an alluvial soil. The origin and nature of HS, with the corresponding codes, abbreviations and concentrations used, are shown in Table 1. 

Table 1. Origin and nature of humic substances used with corresponding codes, abbreviations and concentrations...

Origin and nature of humic substances IHSS Code Abbreviation Concentrations used (mgL-1)... 

Ling, E. A. and Wong, W. C. The origin and nature of ramified and amoeboid microglia an historical review and current concepts. Glia 7 84-92,1993. 

The generality of this title is misleading, since a worthwhile amount of information is only available for perchloric acid. The mechanism of the initiation and propagation in the polymerisation of DCA, especially 1,3-dioxolan (DXL), has been discussed many times [1-7], and the origin and nature of the differences of opinion on these subjects need not be explained here at length. The most important facts can be summarised as follows. 

Memoir. Like Thoughts on the Origins and Nature of Human Ethology. In Hitman Ethology Newsletter,... 

The focus of this chapter is to trace the origin and nature of the major pollution (especially water) problems within the pulp and paper industries and to present an overview of the pollution mitigation strategies and technologies that are currently in practice or being developed (emerging technologies). 

However, it should be kept in mind that the origin and natural occurrence of odd-numbered y-lactones is still not understood and their contribution to food flavour impression is rather limited or negligible, when trace amounts—far below their odour thresholds—are detected. 

Fearon ER. Human cancer syndromes clues to the origin and nature of cancer. Science (Washington,... 

Soddy did not share that Nobel, bnt he wonld win one of his own in 1921 for his contribntions to onr knowledge of the chemistiy of radioactive snbstances, and his investigations into the origin and nature of isotopes. The research conducted at McGill with Rutherford certainly falls nnder the first part of the citation. 

The problem of alcoholic fermentation, of the origin and nature of that mysterious and apparently spontaneous change, which converted the insipid juice of the grape into stimulating wine, seems to have exerted a fascination over the minds of natural philosophers from the very earliest times. 

Observations from these workers coupled with ours shows that the different organic materials, regardless of their origin and nature, react quite similarly to irradiation. 

Use simple examples to demonstrate the origin and nature of differential equations... 

Tetryl was one of three expls used in Black-bum Seely s study (Ref 28) of the origin and nature of detonation light. They obtained some fine photographs with coarse Tetryl that show... 

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