Ancillary files for Blog at at http://www.ch.ic.ac.uk/rzepa/blog/
Data from: Evolution of reduced postcopulatory molecular interactions in Drosophila populations lacking sperm competitionBrian Hollis, David Houle, Tadeusz J. Kawecki, B. Hollis, D. Houle & T. J. Kawecki
In many species with internal fertilization, molecules transferred in the male ejaculate trigger and interact with physiological changes in females. It is controversial to what extent these interactions between the sexes act synergistically to mediate the female switch to a reproductive state or instead reflect sexual antagonism evolved as a byproduct of sexual selection on males. To address this question, we eliminated sexual selection by enforcing monogamy in populations of Drosophila melanogaster for 65 generations...
The Corvides (previously referred to as the core Corvoidea) are a morphologically diverse clade of passerine birds comprising nearly 800 species. The group originated some 30 million years ago in the proto-Papuan archipelago, to the north of Australia, from where lineages have dispersed and colonized all of the world’s major continental and insular landmasses (except Antarctica). During the last decade multiple species-level phylogenies have been generated for individual corvoid families and more recently the inter-familial...
Data from: Bacterial adaptation to sublethal antibiotic gradients can change the ecological properties of multitrophic microbial communitiesVille-Petri Friman, Laura Melissa Guzman, Daniel C. Reuman, Thomas Bell, T. Bell, V.-P. Friman, L. M. Guzman & D. C. Reuman
Antibiotics leak constantly into environments due to widespread use in agriculture and human therapy. Although sublethal concentrations are well known to select for antibiotic-resistant bacteria, little is known about how bacterial evolution cascades through food webs, having indirect effect on species not directly affected by antibiotics (e.g. via population dynamics or pleiotropic effects). Here, we used an experimental evolution approach to test how temporal patterns of antibiotic stress, as well as migration within metapopulations, affect...
Data from: Use of elastic stability analysis to explain the stress-dependent nature of soil strengthKevin J. Hanley, Catherine O'Sullivan, Mohammad Ahmer Wadee, Xin Huang, K. J. Hanley, X. Huang, C. O'Sullivan & M. A. Wadee
The peak and critical state strengths of sands are linearly related to the stress level, just as the frictional resistance to sliding along an interface is related to the normal force. The analogy with frictional sliding has led to the use of a ‘friction angle’ to describe the relationship between strength and stress for soils. The term ‘friction angle’ implies that the underlying mechanism is frictional resistance at the particle contacts. However, experiments and discrete...
Data from: Development of the corticospinal and callosal tracts from extremely premature birth up to 2 years of ageRodrigo M. Braga, Elise Roze, Gareth Ball, Nazakat Merchant, Nora Tusor, Tomoki Arichi, David Edwards, Daniel Rueckert & Serena J. Counsell
White matter tracts mature asymmetrically during development, and this development can be studied using diffusion magnetic resonance imaging. The aims of this study were i. to generate dynamic population-averaged white matter registration templates covering in detail the period from 25 weeks gestational age to term, and extending to 2 years of age based on DTI and fractional anisotropy, ii. to produce tract-specific probability maps of the corticospinal tracts, forceps major and forceps minor using probabilistic...
Data from: Liverworts to the rescue: an investigation of their efficacy as mycorrhizal inoculum for vascular plantsJill Kowal, Silvia Pressel, Jeffrey G. Duckett & Martin I. Bidartondo
Pezoloma ericae (D.J. Read) Baral, a widespread mycorrhizal fungus of plants in the Ericales, is known to form intracellular associations with several families of leafy liverworts (Schistochilaceae, Lepidoziaceae, Cephaloziaceae, Cephaloziellaceae) in vitro. The ecological significance of this link between vascular and non-vascular plants is unknown. Fungal symbionts were isolated from rhizoids of the leafy liverworts Cephalozia connivens (Dicks.) Lindb. and C. bicuspidata (L.) Dum. (Cephaloziaceae), as well as from the hair roots of two dominant...
Data from: Parasites in bloom: flowers aid dispersal and transmission of pollinator parasites within and between bee speciesPeter Graystock, Dave Goulson & William O. H. Hughes
The dispersal of parasites is critical for epidemiology, and the interspecific vectoring of parasites when species share resources may play an underappreciated role in parasite dispersal. One of the best examples of such a situation is the shared use of flowers by pollinators, but the importance of flowers and interspecific vectoring in the dispersal of pollinator parasites is poorly understood and frequently overlooked. Here, we use an experimental approach to show that during even short...
Cooperative secretion of virulence factors by pathogens can lead to social conflict when cheating mutants exploit collective secretion, but do not contribute to it. If cheats outcompete cooperators within hosts, this can cause loss of virulence. Insect parasitic nematodes are important biocontrol tools that secrete a range of significant virulence factors. Critically, effective nematodes are hard to maintain without live passage, which can lead to virulence attenuation. Using experimental evolution we tested whether social cheating...
Data from: Plant-soil feedbacks from 30-year family-specific soil cultures: phylogeny, soil chemistry and plant life stageZia Mehrabi, Owen T. Lewis & Thomas Bell
Intraspecific negative feedback effects, where performance is reduced on soils conditioned by conspecifics, are widely documented in plant communities. However, interspecific feedbacks are less well studied, and their direction, strength, causes, and consequences are poorly understood. If more closely related species share pathogens, or have similar soil resource requirements, plants may perform better on soils conditioned by more distant phylogenetic relatives. There have been few empirical tests of this prediction across plant life stages, and...
Species interactions can play a major role in shaping evolution in new environments. In theory, species interactions can either stimulate evolution by promoting coevolution or inhibit evolution by constraining ecological opportunity. The relative strength of these effects should vary as species richness increases, and yet there has been little evidence for evolution of component species in communities. We evolved bacterial microcosms containing between 1 and 12 species in three different environments. Growth rates and yields...
This dataset comprises cast reconstructions of brain cavity space in 60 extant avian species, derived from X-ray micro computed-tomography scan image stacks. Each reconstruction was made using Materialise Mimics 14.11 to create volumetric models (brain cavity casts) that were then transformed into the polygon mesh stereolithograph (STL) files archived here. Brain cavity cast models are in most cases accompanied by casts of main vascular features (e.g., carotid arteries) and the olfactory nerves (CN I). A...
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Kinetic deuterium isotope effects for the diazocoupling to 2,4-substituted indoles for substituents R=H, t-butyl, methyl.
Wouter's PhD thesis, Imperial College London, 2014-2017
chemdraw test 2 desc
Imperial College London63
University of Sussex1
National Museums Scotland1
Royal Botanic Gardens1
Natural History Museum1
University of Lausanne1
United States Department of Agriculture1
University of Manchester1
University of Copenhagen1
University of Lethbridge1
King's College - Pennsylvania1
Royal Holloway University of London1
University of Oxford1