Search results for "Darwin"
showing 10 items of 96 documents
Les Irlandais : le maillon manquant de la chaîne de l'évolution ?
2011
International audience; L’historien Lewis Perry Curtis ouvrit un large champ de recherche en publiant Apes and Angels en 1971, à un moment où la situation en Irlande du Nord se tendait.
Distinct bhaplotype structure at the innate immune receptor Toll-like receptor 2 across bank vole populations and lineages in Europe
2015
Abstract: Parasite-mediated selection may contribute to the maintenance of genetic variation at host immune genes over long time scales. To date, the best evidence for the long-term maintenance of immunogenetic variation in natural populations comes from studies on the major histocompatibility complex (MHC) genes, whereas evidence for such processes from other immune genes remains scarce. In the present study, we show that, despite pronounced population differentiation and the occurrence of numerous private alleles within populations, the innate immune gene Toll-like receptor 2 (TLR2) displays a distinct haplotype structure in 21 bank vole (Myodes glareolus) populations across Europe. Haplo…
Differential enumeration and in situ localization of microorganisms in the hindgut of the lower termite Mastotermes darwiniensis by hybridization wit…
1999
We examined the abundance and spatial distribution of major phylogenetic groups of the domain Bacteria in hindguts of the Australian lower termite Mastotermes darwiniensis by using in situ hybridization with group-specific, fluorescently labeled, rRNA-targeted oligonucleotide probes. Between 32.0 +/- 7.2% and 52.3 +/- 8.2% of the DAPI-stained cells in different hindgut fractions were detected with probe EUB338, specific for members of the domain Bacteria. About 85% of the prokaryotic cells were associated with the flagellates of the thin-walled anterior region (P3a) and the thick wall of the posterior region (P3b/P4) of the hindgut, as shown by DAPI staining. At most, half of the EUB338-det…
Dialoghi a distanza in tema di socialità e storicità del diritto. Italia, Francia e Germania tra fine Ottocento e primo Novecento
2015
L’intreccio di trasformazioni che tra Otto e Novecento cambia il volto dell’Europa fa da sfondo a uno dei momenti più alti della storia della cultura giuridica. Un comune afflato sembra ispirare gli indirizzi che in Italia, Francia e Germania sollecitano un rinnovamento del metodo e un ripensamento della stessa nozione di diritto. Le fibrillazioni della «Scuola sociale del diritto», già attiva in Italia negli anni Ottanta, incrociavano le inquietudini del “rinascimento giuridico” francese e le provocazioni del gius-liberismo tedesco, sovrapponendosi le une alle altre, percorrendo itinerarii contigui, attingendo a un patrimonio scientifico comune. Le componenti eterodosse della cultura giuri…
The fine structure of colleterial glands in two cockroaches and three termites, including a detailed study of Cryptocercus punctulatus (Blattaria, Cr…
2007
1873-5495 (Electronic) Journal Article Research Support, U.S. Gov't, Non-P.H.S.; The colleterial glands of insects are organs associated with the female genital apparatus. In cockroaches, these glands produce secretions that cover two parallel rows of eggs during oviposition, and in oviparous species, these secretions become the tanned, sculpted, rigid outer casing of the ootheca. The goal of this study was to compare the gross anatomy of the colleterial glands and the ultrastructure of their component tubules in the phylogenetically significant genera Cryptocercus (Blattaria) and Mastotermes (Isoptera). Recent studies indicate that cockroaches in the genus Cryptocercus are the sister group…
Viatgers romàntics. Els viatges d’Alexander von Humboldt i de Charles Darwin
2013
Tot i pertànyer a generacions diferents i representar formes diferents d’aproximació a l’estudi de la natura, Humboldt i Darwin comparteixen el fet de tenir en l’aventura individual d’un gran viatge iniciàtic la fita determinant de la seva fructífera carrera científica.
Evolucionismo, integración sociocognitiva y cambio semántico
2014
El cambio es el fenómeno lingüístico por excelencia a la hora de aplicar los modelos teóricos evolucionistas. La perspectiva evolucionista del lenguaje permite analizar el cambio lingüístico como un fenómeno sujeto a los mismos procesos evolutivos que determinan cualquier sistema evolutivo complejo. El objetivo de este estudio es defender una integración más sistemática de los factores sociales y cognitivos del cambio lingüístico, en particular del cambio semántico. Este artículo se centra en un enfoque evolutivo del cambio lingüístico muy influyente, la Teoría de la Selección del Enunciado del cambio lingüístico desarrollada por Croft (2000). El enfoque evolutivo de Croft se inspira en la …
Compositional Homology and Creative Thinking
2015
The concept of homology is the most solid theoretical basis elaborated by the morphological thinking during its history. The enucleation of some general criteria for the interpretation of homology is today a fundamental tool for life sciences, and for restoring their own opening to the question of qualitative innovation that arose so powerfully in the original Darwinian project. The aim of this paper is to verify the possible uses of the concept of compositional homology in order to provide of an adequate understanding of the dynamics of creative thinking.
Darwin and Ethics : Using Natural Selection to Understand Ethical Business and Organizational Behavior
2000
The origins of ethics and morality have been considered for many, many years. From ancient Greek metaphysicians to the great theologians of the Middle Ages to modern philosophers, different systematic frameworks have been developed to understand how and why ethics are formed. These frameworks provide people and organizations with guidance about how to act toward other humans and institutions in their environment. Steiner and Steiner (1991) discuss six different primary sources for understanding the development of ethics: religious, philosophical, cultural, legal, codes of conduct, and genetics (see Table). Of these six systems, the genetic framework is clearly the least developed, least exp…
Data from: Correlational selection on pro- and anti-inflammatory effectors
2012
Parasites impose a permanent threat for hosts. As a consequence, immune defenses are important for host fitness. However, the immune response can also produce self-damage and impair host fitness if not properly regulated. Effectors that up- and down-regulate the immune response should, therefore, evolve in concert, and be under the action of correlational selection. To address this issue, we assessed the shape of the selection operating on pro- and anti-inflammatory effectors following an inflammatory challenge in laboratory mice. We found that selection acts on the combination of these two traits as individuals that produced large amount of pro-inflammatory cytokines could achieve relative…