Review: Food Loss and Food Waste: Causes and Solutions

Book review for Food Loss and Food Waste: Causes and Solutions

Book review: Psychology and politics: a social identity perspective

"Psychology and Politics: a Social Identity Perspective." Alexa Ispas. Psychology Press. December 2012. --- This book covers a wide range of political topics, such as the way in which categorising ourselves into groups influences how we perceive the social world, the implications of categorisation for social influence, and the mechanisms underlying obedience under authoritarian regimes. Yves Laberge thinks this book serves as an excellent update on the social identity perspective

Book review: Ethnography and virtual worlds: a handbook of method

"Ethnography and Virtual Worlds: A Handbook of Method." Tom Boellstorff, Bonnie Nardi, Celia Pearce and T.L. Taylor. Princeton University Press. August 2012. --- Ethnography and Virtual Worlds is aimed at students, teachers, designers, and scholars interested in using ethnographic methods to study online virtual worlds, including both game and nongame environments. Written by leading ethnographers of virtual worlds, and focusing on the key method of participant observation, the book aims to provide invaluable advice to aid researchers through every stage of a project, from choosing an online fieldsite to writing and publishing the results. Reviewed by Yves Laberge

Review: Le Saint-Laurent d'île en île. Rencontres et paysages (The St. Lawrence from Island to Island: Meetings and Landscapes)

Book review of Le Saint-Laurent d'île en île. Rencontres et paysage

Review: Plastic Soup: An Atlas of Ocean Pollution

Book review for Plastic Soup: An Atlas of Ocean Pollution

Review: Éduquer par la Philosophie et le Conte au Développement Durable: 12 Ateliers Pédagogiques (Education through philosophy and tale for Sustainability development: 12 pedagogical workshops)

Book review of Éduquer par la Philosophie et le Conte au Développement Durable: 12 Ateliers Pédagogiques

A model for the biological precipitation of Precambrian iron-formation

A biological model for the precipitation of Precambrian iron formations is presented. Assuming an oxygen deficient atmosphere and water column to allow sufficient Fe solubility, it is proposed that local oxidizing environments, produced biologically, led to precipitation of iron formations. It is further suggested that spheroidal structures about 30 mm in diameter, which are widespread in low grade cherty rion formations, are relict forms of the organic walled microfossil Eosphaera tylerii. The presence of these structures suggests that the organism may have had a siliceous test, which allowed sufficient rigidity for accumulation and preservation. The model involves precipitation of ferric hydrates by oxidation of iron in the photic zone by a variety of photosynthetic organisms. Silica may have formed in the frustules of silica secreting organisms, including Eosphaera tylerii. Iron formates formed, therefore, by a sediment rain of biologically produced ferric hydrates and silica and other organic material. Siderite and hematite formed diagenetically on basin floors, and subsequent metamorphism produced magnetite and iron silicates