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Biogeochemistry and Genomics of Silicification and Silicifiers, volume II
This is the second issue of the Research Topic: Biogeochemistry and Genomics of Silicification and Silicifiers. The first issue article collection can be found here: https://www.frontiersin.org/research-topics/5364/biogeochemistry-and-genomics-of-silicification-and-silicifiers Silicifiers are among the most important living organisms of planet Earth. They are able to take advantage of the abundance of silicon in the Earth crust to build silicified architectures, which in particular can help for protection against predators or for facilitating the penetration of light and nutrients to the cells.
Microbial Exopolymers: Sources, Chemico-Physiological Properties, and Ecosystem Effects in the Marine Environment
Microorganisms (bacteria, archaea, microeukaryotes) in marine environments secrete a diverse array of exopolymeric substances that facilitate attachment to surfaces, the formation of organic colloids and larger aggregations of cells (marine snow), and that can influence many ocean, as well as global, processes. The aim of this Research Topic is to highlight recent advances in the sources, chemistry and function of these microbial-produced macromolecules. We encouraged original research and reviews on exopolymeric substances, from their sources, chemico-physiological properties, functions and ecosystem effects, and including their role in the Gulf of Mexico following the Deepwater Horizon oil spill disaster.
Plastic Legacies
There is virtually nowhere on earth that remains untouched by plastics and the situation presents a serious threat to our natural world. Despite the magnitude of the problem, the interventions most often put in place are consumer-led and market-based and only nominally capable of addressing the issue. As the problem worsens and neoliberal ideologies limit the world’s responses to this crisis, there is a growing need for legislative frameworks that attend to the complex social and ecological issues associated with plastics. The contributors to this volume bring expertise from across academic disciplines to illustrate how plastics are produced, consumed, and discarded and to find holistic an...
Zooplankton and Nekton: Gatekeepers of the Biological Pump
This eBook is a collection of articles from a Frontiers Research Topic. Frontiers Research Topics are very popular trademarks of the Frontiers Journals Series: they are collections of at least ten articles, all centered on a particular subject. With their unique mix of varied contributions from Original Research to Review Articles, Frontiers Research Topics unify the most influential researchers, the latest key findings and historical advances in a hot research area! Find out more on how to host your own Frontiers Research Topic or contribute to one as an author by contacting the Frontiers Editorial Office: frontiersin.org/about/contact.
Ecologies of Gender
Ecologies of Gender: Contemporary Nature Relations and the Nonhuman Turn examines the role of gender in recent debates about the nonhuman turn in the humanities, and critically explores the implications for a contemporary theory of gender and nature relations. The interdisciplinary contributions in this volume each provides theoretical reflections based on an analysis of specific naturecultural processes. They reveal how "ecologies of gender" are constructed through aesthetic, epistemological, political, technological and economic practices that shape multispecies and material interrelations as well as spatial and temporal orderings. The volume includes contributions from cultural anthropolo...
WerkstattGeschichte
WerkstattGeschichte ist eine Zeitschrift, in der über Geschichte und ihre Akteur*innen ebenso reflektiert wird wie über historisches Forschen und Schreiben. Sie bietet Platz, konventionelle Perspektiven zu durchbrechen und neue Formen der Darstellung zu erproben. Die Zeitschrift bleibt der Sozialgeschichte verbunden, legt aber deutlichen Wert darauf, die »große Geschichte« aus einer alltagsgeschichtlichen Perspektive zu befragen. Das Heft »Müll«, herausgegeben von Wiebke Kolbe und Monika Sigmund, widmet sich den bisher unerforschten Tiefen des Abfalls: Gab es Müll in der Frühen Neuzeit? Ist Recycling die große Illusion der Moderne? Sind deutsche Giftmüllexporte eine neue Form des Kolonialismus? Ein weiterer Schwerpunkt liegt auf der Meeresverschmutzung durch Plastikmüll und Weltkriegsmunition.
Étude de la dissolution de la silice biogénique des agrégats
L’augmentation de la teneur en carbone dans l’atmosphère provoquée par les activités anthropiques est freinée par l’effet « puit de carbone » de certaines régions de l’océan, en particulier grâce à la pompe biologique de carbone. La forte participation des diatomées à la production primaire océanique ainsi que leur capacité à former des agrégats nous ont conduit à étudier le rôle des diatomées, et en particulier l’impact de l’agrégation sur la pompe biologique de carbone. Des expériences en laboratoire ont permis de déterminer que la vitesse de dissolution des frustules de diatomées est plus faible pour les cellules agrégées que pour les cellules libres....
