H.-D. Behnke & R.D. Sjolund 
Sieve Elements [PDF ebook] 
Comparative Structure, Induction and Development

Parrotfish are found on almost every coral reef in the world. This ubiquity and uniqueness of their feeding action make them one of the most important groups of fishes within coral reef ecosystems. B …

The main effects of Seaweed extracts (Ascophyllum, Fucus, Sargassum, Saccorhiza, Laminaria, Gelidium and others), when used as agricultural fertilizers, are better seed germination and higher quality …

First Published in 1977, this book serves as a directory for the handbook of biochemistry and molecular biology. …

This book is an accessible resource offering practical information not found in more database-oriented resources. The first chapter lists acronyms with definitions, and a glossary of terms and subjec …

This spectacular updated edition of Field Guide to Butterflies of South Africa is the only guide to cover all 671 butterfly species that occur in South Africa. Fully revised and expanded, it includes …

Hidden problems, buried deep in the pipe networks of water distribution systems, are very serious potential threats to water quality. Microbial Quality of Water Supply in Distribution Systems outline …

The purpose of this book is to provide information on senescent cells and why they are prevented from multiplying via cell division. It includes main sections on the nature of Go/1 transition, factor …

Having trouble separating your scops from your screech owls, Tengmalm”s from Tawny Owl or Collared and Spotted Owlets? Then this is the book for you. Owls of the World is the ultimate photographic r …

Universally recognised as by far the most authoritative work ever published on the subject, The Birds of Africa is a superb multi-contributor reference work, with encyclopaedic species texts, stunnin …

This edition provides the reader with an introduction to this subject. During the past five years there has been a virtual explosion of information on the different phases of fertilization.This book …