Tom Fenchel

Bacterial Biogeochemistry: The Ecophysiology of Mineral Cycling, Fourth Edition discusses the influence of bacterial activity on the chemical environment of the biosphere. Following the success of previous editions, this update focuses on bacterial metabolism and its relevance to the environment, including the decomposition of soil, food chains, nitrogen fixation, assimilation, and reduction of carbon nitrogen and sulfur, and microbial symbiosis. All chapters have been revised and brought up-to-date in light of the many advances and discoveries that have taken place during the last decade. The scope of the new edition has broadened to provide a review of the processes and phenomena that are relevant for global change feedback loops and advances in bacterial biogeochemical cycles.

Naturen i Danmark er et storværk om den natur, som danskerne i dag bruger og interesserer sig for mere end nogensinde tidligere. Emner som miljøspørgsmål, forurening, landbrugsinteresser og nationalparker har sat naturen på dagsordenen, og dette nye værk giver et enestående overblik vores geologiske, biologiske og landskabsmæssige grundlag og åbner øjnene for, hvor rig den danske natur er og har været.

Bacterial Biogeochemistry, Third Edition focuses on bacterial metabolism and its relevance to the environment, including the decomposition of soil, food chains, nitrogen fixation, assimilation and reduction of carbon nitrogen and sulfur, and microbial symbiosis. The scope of the new edition has broadened to provide a historical perspective, and covers in greater depth topics such as bioenergetic processes, characteristics of microbial communities, spatial heterogeneity, transport mechanisms, microbial biofilms, extreme environments and evolution of biogeochemical cycles.

EvolutionslAeren beskriver livets udvikling gennem Jordens historie og gor de sAereste fAenomener begribelige - fra bakteriers DNA i vores celler til smaborgermonogami hos solsorte og atmosfAerens indhold af ilt.Denne bog giver lAeseren et samlet overblik over den skelsAettende teori og dens udvikling. Linjen trAekkes fra gennembruddet med Charles Darwins hovedvAerk Arternes oprindelse i 1859 og frem til den molekylAere genetiks revolutionerende resultater i de seneste ar. Evolutionens historie og mekanismer, arvelighedens natur, konnets formering og evolutionAert bestemte adfAerdsmonstre forklares.SAerligt sAettes der fokus pa en ofte underbelyst konsekvens af Darwins ide om naturlig selektion eller survival of the fittest: Livets udvikling er uden mal, og mennesket er derfor ikke det ypperste resultat af en lang forAedlingsproces.

This book is written for ecologists and protozoologists. Ecologists who study environments and biotic communities in which protozoa are im- ponant should find this book especially useful. During the last decade it has become clear that protozoa play important roles in natural eco- systems, but few ecologists have a feeling for the functional properties and the diversity of these organisms. Protozoa pose or exemplify many general problems of population and community ecology, and of evo- lutionary biology. In most respects the general ecological propenies of protozoa are not fundamentally different from those of larger organisms; yet, due to their small size, short generation times, and ubiquitous oc- currence they often present ecological phenomena in a new and dif- ferent light. To this should be added that protozoa are well-suited for experimental work. Despite these advantages, the study of protozoa has played a relatively modest role in the development of ecology and ev- olutionary biology, primarily, I believe, because most ecologists are unfamiliar with these organisms. I hope this book will attract more attention to these favorable characteristics of protozoa. I also hope that this book may make protozoologists aware of new aspects of their pet organisms. For a long time (that is, until the fun- damental distinction between prokaryotic and eukaryotic cells was rec- ognized) protozoa were believed to represent the simplest form of life. They were therefore extensively used for the experimental study of basic questions of cell biology.