538 research outputs found

    Method or madness: does OTU delineation bias our perceptions of fungal ecology?

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    This is the author's manuscript. The definitive version is available at www.newphytologist.co

    The orthogonal LMBA: a novel RFPA architecture with broadband reconfigurability

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    A novel RF power amplifier (RFPA) architecture, the orthogonal load-modulated balanced amplifier, or OLMBA, is described and demonstrated. Compared to the load-modulated balanced amplifier (LMBA), the OLMBA displays many of the same benefits, such as active adaptive tuning using the phase and amplitude of an external control signal, but with much lower power requirements on the control signal power (CSP). As such, a useful range of active tuning can be implemented with essentially no impact on overall efficiency due to the low level of a control signal. A demonstrator is described and measured, which delivers 30 W at a minimum of 50% efficiency over a 0.65-3.25-GHz bandwidth

    Deciphering the relative contributions of multiple functions within plant-microbe symbioses

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    This is the publisher's version, also available electronically from http://www.esajournals.org/doi/abs/10.1890/09-1858.1For microbial symbioses with plants, such as mycorrhizas, we typically quantify either the net effects of one partner on another or a single function a symbiont provides. However, many microbial symbioses provide multiple functions to plants that vary based on the microbial species or functional group, plant species, and environment. Here we quantified the relative contributions of multiple functions provided by arbuscular mycorrhizal (AM) fungi to symbiont-mediated changes in plant biomass. We used two published data sets, one that measured multiple functions (pathogen protection and nutrient uptake) on a single plant and one that measured a single function (pathogen protection) on multiple plants. Using structural equation modeling, we observed strong variation in the functional pathways by which AM fungi altered plant growth; changes in plant biomass were associated with different functions (and different AM fungal functional groups) for the different plant species. Utilizing this methodology across multiple partners and environments will allow researchers to gauge the relative importance of functions they isolate and, perhaps more importantly, those they did not consider. This baseline information is essential for establishing the specific mechanisms by which microbial symbioses influence plant diversity and to more effectively utilize these organisms in agriculture, restoration and conservation
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