This book is about selectively toxic agents. That is to say, it is about those substances that affect certain cells without harming others, even when they are close neighbours. Toxicity need not be fatal. It can be made easily reversible, as is the case with general anaesthetics. Selective toxicity covers an immense field: most of the drugs used for treating illness in man and his economic animals, as well as all of the fungicides, insecticides, and weed killers that are used in agricultur...

1 What is Selectivity? purpose, and crop protective agent for the A biologically-active substance is said to be second, but there is no fundamental difference selective if it strongly affects certain cells with of principle in their mode of action. out causing any change in others, even when the Drug therapy has two, fundamentally two kinds of cells are close neighbours. In living opposed divisions. The first of these strives to organisms, there are many substances, often improve the...

The student of biological science in his final years as an undergraduate and his first years as a graduate is expected to gain some familiarity with current research at the frontiers of his discipline. New research work is published in a perplexing diversity of publications and is inevitably concerned with the minutiae of the subject. The sheer number of research journals and papers also causes confusion and difficulties of assimilation. Review articles usually presuppose a background know...

In this book we present a largely biochemical look at the metals of life and their functions, which we hope will be of interest to chemists and biologists as well as biochemists. The field of 'inorganic bio chemistry' is one of rapid change. Recent developments in our know ledge of the activity of calcium, and of the iron-sulphur proteins, are two examples, and increasing attention is being paid to non-metals as well [3]. For reasons of space, we shall restrict ourselves to the normal biol...

The natural world holds secrets under every rock and around every tree. If you've ever wondered what life is like through a microscope, telescope, or with the naked eye--you'll love this book!You will:Run with the antelope across the American plains and learn about the food chain.Climb with a monkey to the highest tree in the rainforest and discover how photosynthesis keeps leaves green.Sink to the bottom of the ocean to follow cre...

THE MAGIC SCHOOL BUS PRESENTS THE PLANETS is a photographic nonfiction companion book to the original bestselling title, THE MAGIC SCHOOL BUS LOST IN THE SOLAR SYSTEM.LOST IN THE SOLAR SYSTEM taught thousands of kids about the planets, moons, stars, and everything else you'd want to know about outer space. MAGIC SCHOOL BUS PRESENTS THE PLANETS will expand upon the original title with fresh, updated, Common Core aligned content about the amazing planets in our solar system. With viv...

Good friends come in all shapes and sizes!Unlikely Friendships, the runaway New York Times bestseller with a compelling message of hope and friendship and differences overcome, is rewritten just for younger readers. This hardcover chapter book for children ages seven and up collects five heartwarming true stories of animal friendship: a dog that loves an elephant, a bear and a cat who become best friends, a house cat who looks after a dog as he goes blind, a lione...

Good friends come in all shapes and sizes!Unlikely Friendships, the runaway New York Times bestseller with a compelling message of hope and friendship and differences overcome, is rewritten just for younger readers. This hardcover chapter book for children ages seven and up collects five heartwarming true stories of animal friendship: a hippo and the goat who is his best friend, an iguana that snuggles with a cat, a dog that takes care of a blind deer, a cat and o...

You Are Stardust begins by introducing the idea that every tiny atom in our bodies came from a star that exploded long before we were born. From its opening pages, the book suggests that we are intimately connected to the natural world; it compares the way we learn to speak to the way baby birds learn to sing, and the growth of human bodies to the growth of forests. Award-winning author Elin Kelsey — along with a number of concerned parents and educators around the world — believe...

Get your child excited about math with some maze fun. This book combines the study of math with the fun of games. Select a division problem and solve it, then check your answer with the math maze. Explore the maze to arrive at the answer.Easily navigate the links to the math maze and answer. Then return to the practice problems to select another. Twenty problems in all, each with an answer maze. Most appropriate for 3rd and 4th grade students.

Build your students' scientific thinking and practical skills with this Third Edition textbook, developed specifically for the 2017 GCSE specifications, from the No. 1 publisher for CCEA GCSE Science.- Develop understanding with clear Examples, Tips and Practical activities.- Prepare students for assessment with Test Yourself questions, Maths practice and Exam-style questions throughout.- Provides everything you need for GCSE Biology and the Biology co...

Books on engineering design, like designs them selves, are highly individual. In this one, the author emphasizes the importance of a visual approach to machine design and makes his point by including a large number of illustrations. He also stresses the need for clear objectives in all design work. Professor Leyer is an experienced designer and an inspiring teacher, and his book is based on his own lecture course in the subject. Throughout, he shows be the goal to which mathematics, mech d...