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The study describes a detailed and original piece of research work, investigating a very important genre of human communication, and that is conversation. It provides a definition of the genre of conversation by describing nine features of conversation, namely multiple sources, discourse coherence, language as doing, co-operation, unfolding, open-endedness, artifacts, inexplicitness and shared responsibility. These nine features of naturalness in conversation serve to distinguish conversation from specialized discourse types. The study illustrates the nine defining features of conversation with authentic conversational data collected surreptitiously in England. While this study is of native speakers of English, the nine defining features of naturalness of English conversation are applicable to conversations conducted in other languages.

Conversation analysis. --- Discourse analysis. --- Naturalness (Linguistics) --- Natural class (Linguistics) --- Linguistics --- Discourse grammar --- Text grammar --- Semantics --- Semiotics --- Analysis of conversation --- CA (Interpersonal communication) --- Conversational analysis --- Oral communication --- Conversation analysis --- Discourse analysis --- Analyse de la conversation --- Analyse du discours --- Naturalité (Linguistique) --- Pragmatics --- Naturalness (Linguistics).

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Excluding the biological polymers proteins, lipids and nucleic acids, modified tetrapyrroles are the biological molecules that have had the greatest impact on the evolution of life over the past 4 billion years. They are involved in a wide variety of fundamental processes that underpin central primary metabolism in all kingdoms of life, from photosynthesis to methanogenesis. Moreover, they bring colour into the world and it is for this reason that these compounds have been appropriately dubbed the ‘pigments of life’. To understand how and why these molecules have been so universally integrated into the life processes one has to appreciate the chemical properties of the tetrapyrrole scaffold and, where appropriate, the chemical characteristics of the centrally chelated metal ion. This book addresses why these molecules are employed in Nature, how they are made and what happens to them after they have finished their usefulness.

Chlorophyll. --- Heme. --- Porphyrins. --- Tetrapyrroles --- Chlorophyll --- Porphyrins --- Heme --- Macrocyclic Compounds --- Pyrroles --- Heterocyclic Compounds with 4 or More Rings --- Azoles --- Heterocyclic Compounds --- Polycyclic Compounds --- Chemicals and Drugs --- Heterocyclic Compounds, 1-Ring --- Animal Biochemistry --- Botany - General --- Human Anatomy & Physiology --- Botany --- Health & Biological Sciences --- Earth & Environmental Sciences --- Tetrapyrroles. --- Hematin --- Porphyrin and porphyrin compounds --- Life sciences. --- Plant science. --- Botany. --- Life Sciences. --- Plant Sciences. --- Botanical science --- Phytobiology --- Phytography --- Phytology --- Plant biology --- Plant science --- Biology --- Natural history --- Plants --- Biosciences --- Sciences, Life --- Science --- Macrocyclic compounds --- Pigments (Biology) --- Chloroplast pigments --- Photosynthetic pigments --- Plant photoreceptors --- Floristic botany

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