This groundbreaking work, the culmination of more than 10 years of research, presents a breakthrough theory of chemical bonding across the periodic table. Professor Epiotis, an internationally known and respected member of the theoretical community, challenges the conventional chemical concepts that underlie popular theories of chemical bonding. Building on his insight that electron-electron repulsion is the single crucial variable that differentiates one chemical system from another, the author formulates, explains, and applies a new approach based on nonorthogonal valence bond methodology that amounts to nothing less than a revolutionary unified theory of chemical boding across the periodic table. This work represents the first post-Pauling theory of chemical bonding. New theory means new formulae, and this work is about new chemical formulae that lead to the self-consistent rationalization of existing facts and, even more important, the design of new chemistry.

This book provides an overview of the intricacies of plant communication via volatile chemicals. Plants produce an extraordinarily vast array of chemicals, which provide community members with detailed information about the producer’s identity, physiology and phenology. Volatile organic chemicals, either as individual compounds or complex chemical blends, are a communication medium operating between plants and any organism able to detect the compounds and respond. The ecological and evolutionary origins of particular interactions between plants and the greater community have been, and will continue to be, strenuously debated. However, it is clear that chemicals, and particularly volatile chemicals, constitute a medium akin to a linguistic tool. As well as possessing a rich chemical vocabulary, plants are known to detect and respond to chemical cues. These cues can originate from neighbouring plants, or other associated community members. This book begins with chapters on the complexity of chemical messages, provides a broad perspective on a range of ecological interactions mediated by volatile chemicals, and extends to cutting edge developments on the detection of chemicals by plants.

In humans, the perception of odours adds a fourth dimension to life, from the scent of flowers, the aroma of foods, and all the subtle smells in the environment. But how many types of odours can we distinguish? Why do we like the food we like? Which are the most powerful odorants, and how well does the human sense of smell perform compared with that of a dog or a butterfly? The sense of smell is highly complex, and such complexity discouraged scientists for a long time, leaving the world of smell in an atmosphere of mystery. Only recently, thanks to the new tools furnished by molecular biology and neuroscience, are we beginning to answer these questions, uncovering the hidden secrets of our sense of smell, and decoding the language used by most animals to communicate. In this book, Paolo Pelosi, one of the leading figures in the development of the science of olfaction, recounts how the chemical alphabet behind smell has been pieced together over the past three decades. Drawing on anecdotes from his own scientific career, and celebrating the rich variety of smells from herbs to flowers to roast coffee and freshly baked bread, he weaves together an engaging and remarkable account of the science behind the most elusive of our senses.

The author addresses key scientific questions previously explained by rich mythologies, from the evolution of the first humans and the life cycle of stars to the principles of a rainbow and the origins of the universe.

Biology for AP® courses covers the scope and sequence requirements of a typical two-semester Advanced Placement® biology course. The text provides comprehensive coverage of foundational research and core biology concepts through an evolutionary lens. Biology for AP® Courses was designed to meet and exceed the requirements of the College Board’s AP® Biology framework while allowing significant flexibility for instructors. Each section of the book includes an introduction based on the AP® curriculum and includes rich features that engage students in scientific practice and AP® test preparation; it also highlights careers and research opportunities in biological sciences.

Dr Francis S. Collins, head of the Human Genome Project, is one of the world's leading scientists, working at the cutting edge of the study of DNA, the code of life. Yet he is also a man of unshakable faith in God. How does he reconcile the seemingly unreconcilable? In THE LANGUAGE OF GOD he explains his own journey from atheism to faith, and then takes the reader on a stunning tour of modern science to show that physics, chemistry and biology -- indeed, reason itself -- are not incompatible with belief. His book is essential reading for anyone who wonders about the deepest questions of all: why are we here? How did we get here? And what does life mean?