The phylogenetic trees reconstructed from molecular data have led to the discovery that all living creatures belong to three primary kingdoms, or domains, because there are three types of cells in nature. The primary kingdoms are referred to as Archaea, Bacteria, and Eukaya, and their first representatives were the first modern cells that appeared on Earth. All known cells, on the other hand, contain a virtually universal genetic code, and this implies that the code evolved in a population of primitive (...) systems that preceded the first modern cells and is collectively known as the common ancestor of all life. This gives us the problem of understanding how the descendants of the common ancestor gave origin to the first modern cells. In this article it is argued that the appearance of the genetic code allowed the ancestral systems to translate genes into specific proteins, but their behavior was still ambiguous because they were unable to produce specific responses to the signals from the environment. To that purpose they needed to evolve signal processing codes, and here it is proposed that the development of these codes was a crucial step in the evolution of the first modern cells. (shrink)

Horizons of Difference offers twelve original essays inspired by Luce Irigaray's complex, nuanced critique of Western philosophy, culture, and metaphysics, and her call to rethink our relationship to ourselves and the world through sexuate difference. Contributors engage urgent topics in a range of fields, including trans feminist theory, feminist legal theory, film studies, critical race theory, social-political theory, philosophy of religion, environmental ethics, philosophical aesthetics, and critical pedagogy. In so doing, they aim to push the scope of Irigaray's work beyond (...) its horizon. Horizons of Difference seeks conversations that Irigaray herself has yet to fully consider and explores areas that stretch the limits of the notion of sexuate difference itself. Sexuate difference is a unifying mode of thought, bringing disparate disciplines and groups together. Yet it also resists unification in demanding that we continually rethink the basic coordinates of space, place, and identity. Ultimately, Horizons of Difference insists that the fragmented, wounded subjectivities within the dominant regime of masculine sameness can inform how we negotiate space, find place, and transform identity. (shrink)

Protistology, and evolutionary protistology in particular, is experiencing a golden research era. It is an extended one that can be dated back to the 1970s, which is when the molecular rebirth of microbial phylogeny began in earnest. John Archibald, a professor of evolutionary microbiology at Dalhousie University, focuses on the beautiful story of endosymbiosis in his book, John Archibald, One Plus One Equals One: Symbiosis and the Origin of Complex Life. However, this historical narrative could be treated as synecdochal of (...) how the molecular revolution has changed evolutionary biology forever, and that is how Archibald has structured his book. I will address the encompassing theme of molecular methods in detail, but also pay careful attention to the endosymbiosis thread in its own right. (shrink)