Colin Ratledge – författare

This work brings together a number of accounts of the mechanisms whereby microorganisms are able to degrade a wide variety of compounds. These compounds range from petroleum-derived materials, which continue to predominate in questions of environmental contamination and pollution, to the degradation of the major natural materials that microorganisms may encounter in all types of habitat. Both aerobic and anaerobic modes of attack are covered. The emphasis in all the chapters is upon the underlying biochemical pathways that microorganisms use: differences between bacteria, yeasts and moulds are highlighted whenever opportune and uses of microbial consortia for attack on the most recalcitrant molecules is also documented. Activity of microorganisms in the soil, groundwater and marine environments are all considered. The book should be of interest to all whose work brings them into contact with the results of microbial degradations. The consequences of microbial degradations may be beneficial as well as deleterious: an advantage with some compounds, a decided disadvantage with others.The basis by which microorganisms achieve these attacks then provides the vital knowledge that will accelerate the former and, hopefully, retard the latter. The pathways of microbial degradations of all major classes of compounds are covered in a single volume. The diversity of microbial activities are clearly described and current advances in the applications of biochemistry, molecular biology, genetics, enzyme chemistry and engineering feature in almost every chapter.

Featuring recognized academic and industrial experts in this cutting-edge field, this book reviews single cell oils (SCO) currently in the market. The text mainly focuses on the production of the long chain polyunsaturated fatty acids, Arachidonic acid, and Docosahexaenoinc acid. All chapters provide up to date references for navigating the vast amount of historic data available in the field. The authors provide real world examples of the commercial development and applications of various SCO in a variety of fields, from food ingredients and disease treatment to aquaculture and fish farming.

It covers the essential information in this fast moving field giving details of the production of all the major SCOs, their extraction, purification, applications and safety evaluations. In addition, this new edition includes major coverage of the potential of SCOs for biofuels that may be of key significance in the coming years.

Includes sufficient detail on molecular breeding of yeasts and molds Shows how microbial oils have gone from being academic curisoisties to being minor commodity oils Presents details on the safey and nutrition of single cell oils for human and animal nutrition

Life on the planet depends on microbial activity. The recycling of carbon, nitrogen, sulphur, oxygen, phosphate and all the other elements that constitute living matter are continuously in flux: microorganisms participate in key steps in these processes and without them life would cease within a few short years. The comparatively recent advent of man-made chemicals has now challenged the environment: where degradation does not occur, accumulation must perforce take place. Surprisingly though, even the most recalcitrant of molecules are gradually broken down and very few materials are truly impervious to microbial attack. Microorganisms, by their rapid growth rates, have the most rapid turn-over of their DNA of all living cells. Consequently they can evolve altered genes and therefore produce novel enzymes for handling "foreign" compounds - the xenobiotics - in a manner not seen with such effect in other organisms. Evolution, with the production of micro-organisms able to degrade molecules hitherto intractable to breakdown, is therefore a continuing event. Now, through the agency of genetic manipulation, it is possible to accelerate this process of natural evolution in a very directed manner. The time-scale before a new microorganism emerges that can utilize a recalcitrant molecule has now been considerably shortened by the application of well-understood genetic principles into microbiology. However, before these principles can be successfully used, it is essential that we understand the mechanism by which molecules are degraded, otherwise we shall not know where best to direct these efforts.