The Proteins Pt 4
The Proteins Pt 4

Author: Hans Neurath

Publisher: Elsevier

Published: 2012-12-02

Total Pages: 696

ISBN-13: 0323162045

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The Proteins, Third Edition, Volume IV is a four-chapter text that explores the unifying concepts of protein chemistry and the methods of analysis that can be applied to most proteins. The first chapter deals with the biological origins and subsequent evolution of proteins. This chapter also provides the various procedures for comparing amino acid sequences and for establishing the relatedness of protein structures. A discussion on gene duplication as a principal vehicle of evolutionary change is also included in this chapter. Chapter 2 focuses on chromosomal proteins, such as those proteins associated with the genetic material of eukaryotic organisms, specifically the protamines, the histones, and the ""nonhistone"" proteins. Chapter 3 is devoted to contractile proteins of muscle. This chapter describes the molecular processes whereby chemical energy is converted into the mechanical energy required for the propulsion of living creatures. The structure and function of the individual proteins of the contractile apparatus and their organization as evidenced by light and electron microscopy and by X-ray analysis are also covered. Chapter 4 deals with collagen, an important constituent of the extracellular connective tissues in animals and one of the most abundant proteins. This chapter emphasizes the biosynthesis of collagen fibrils. Organic chemists and researchers, teachers and undergraduate students will find this book invaluable.

Risk Assessment of Food Allergens – Part 4: Establishing exemptions from mandatory declaration for priority food allergens
Risk Assessment of Food Allergens – Part 4: Establishing exemptions from mandatory declaration for priority food allergens

Author: World Health Organization

Publisher: World Health Organization

Published: 2024-02-26

Total Pages: 102

ISBN-13: 924008892X

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The Codex Committee on Food Labelling (CCFL) requested scientific advice as to whether certain foods and ingredients, such as highly refined foods and ingredients, that are derived from the list of foods known to cause hypersensitivity can be exempted from mandatory declaration. The objective of this fourth meeting was to expand on the recommendations from the first meeting concerning derivatives of food allergens and establish a framework for evaluating exemptions for food allergens. A pro forma process has been developed and tested against allergen derivatives previously granted exemptions in various countries or regions and found to be effective for consideration in future exemption decisions. The Expert Committee recommends that the process outlined in the pro forma process be used to guide any future development and evaluation of derivative exemptions. Establishment of safety based upon this weight of evidence approach is dependent upon consideration of data quality, outcome of the exposure assessment for all intended ingredient uses (specified for exemption), and review by competent authorities (as needed). When safety is established, exemption can be justified.