David J. Patterson – författare

Flagellated protozoa are important in two biological disciplines. In evolutionary biology, flagellates are critical to understanding the origins of eukaryotic cells and their diversification as protists and subsequently as plants, animals, and fungi. Flagellated protozoa also play a key role in aquatic ecosystems, where they regulate bacterial numbers and control the remineralization of nutrients. The aim of this volume is to provide a synthesis of information on these organisms. Chapters deal with the organization, diversity, ecology, and maintenance of free-living flagellates. Each chapter is written by a recognized authority in their field. The book will be of interest to protozoologists, protistologists, evolutionary biologists, and ecologists dealing with aquatic or soil ecosystems.

The latest information on heifer development in beef cattle for the food animal practitioner! Topics include rebuilding the US cowherd, physiology and endocrinology of puberty, nutritional development and the target weight debate, long-term reproductive health, effect of prenatal programming on development, economics of development, synchronization of estrus and ovulation, post breeding heifer management, management strategies for adding value to heifers, and more!

What did weather mean to people in the past, and who did they believe controlled it? In this cultural history of the early medieval Frankish world, David J. Patterson argues that the medieval atmosphere was a contested arena in which saintly, royal, demonic, and human authority met and often clashed. Engaging with paleoclimate proxy evidence alongside cultural and religious texts, he illuminates the complex political, metaphorical, and theological underpinnings of medieval descriptions of weather, complicating modern attempts to reconstruct past climate conditions using documentary sources. In particular, Patterson reconstructs how medieval communities built "circles of protection" against storm, drought, and frost, considering how they imagined the tempestarii - the weather-makers - who lived among them. Refusing both environmental determinism and pastoral nostalgia, he offers a new historical perspective on approaches toward protection, blame, and authority, exploring past human relationships with the weather in ways that still resonate today.

What did weather mean to people in the past, and who did they believe controlled it? In this cultural history of the early medieval Frankish world, David J. Patterson argues that the medieval atmosphere was a contested arena in which saintly, royal, demonic, and human authority met and often clashed. Engaging with paleoclimate proxy evidence alongside cultural and religious texts, he illuminates the complex political, metaphorical, and theological underpinnings of medieval descriptions of weather, complicating modern attempts to reconstruct past climate conditions using documentary sources. In particular, Patterson reconstructs how medieval communities built "circles of protection" against storm, drought, and frost, considering how they imagined the tempestarii - the weather-makers - who lived among them. Refusing both environmental determinism and pastoral nostalgia, he offers a new historical perspective on approaches toward protection, blame, and authority, exploring past human relationships with the weather in ways that still resonate today.

Protozoa may be found in almost every aquatic habitat, each containing dozens of species. The diversity can provide invaluable insights into the nature of the habitat. Protozoa can thus be used to illustrate biological principles. This colour guide makes the identification of individual protozoa easily accessible to students and professionals and provides information on protozoan communities found in different environments by means of a wealth of colour photomicrographs supported by original and detailed line drawings and concise text. The guide has been welcomed by professional practitioners, researchers and instructors, by graduate, undergraduate and secondary level students, in a wide range of disciplines, for its clarity in providing a logical system for learning and recognition, the first step towards understanding and using the protozoan community as a biological indicator of environmental change, pollution and contamination.