458 research outputs found
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The microstratigraphy of middens: capturing daily routine in rubbish at Neolithic Çatalhöyük, Turkey
Microstratigraphy — the sequencing of detailed biological signals on site — is an important new approach being developed in the Çatalhöyük project. Here the authors show how microscopic recording of the strata and content of widespread middens on the tell are revealing daily activities and the selective employment of plants in houses and as fuel. Here we continue to witness a major advance in the practice of archaeological investigation.</jats:p
Weak gravitational lensing with CO galaxies
Optical weak lensing surveys have become a powerful tool for precision
cosmology, but remain subject to systematic effects that can severely bias
cosmological parameter estimates if not carefully removed. We discuss the
possibility of performing complementary weak lensing surveys at radio/microwave
frequencies, using detections of CO-emitting galaxies with resolved continuum
images from ngVLA. This method has completely different systematic
uncertainties to optical weak lensing shear measurements (e.g. in terms of
blending, PSF, and redshift uncertainties), and can provide additional
information to help disentangle intrinsic alignments from the cosmological
shear signal. A combined analysis of optical and CO galaxy lensing surveys
would therefore provide an extremely stringent validation of highly-sensitive
future surveys with Euclid, LSST, and WFIRST, definitively rejecting biases due
to residual systematic effects. A lensing survey on ngVLA would also provide
valuable spectral (kinematic) and polarimetric information, which can be used
to develop novel cosmological analyses that are not currently possible in the
optical.Comment: Contribution to 2018, ASP Conference Series Monograph 7, "Science
with a Next-Generation Very Large Array," Eric Murphy, ed., in preparatio
Development Of An Engineered Bioluminescent Reporter Phage For Detection Of Bacterial Blight Of Crucifers
Bacterial blight, caused by the phytopathogen Pseudomonas cannabina pv. alisalensis, is an emerging disease afflicting important members of the Brassicaceae family. The disease is often misdiagnosed as pepper spot, a much less severe disease caused by the related pathogen Pseudomonas syringae pv. maculicola. We have developed a phage-based diagnostic that can both identify and detect the causative agent of bacterial blight and differentiate the two pathogens. A recombinant >light>-tagged reporter phage was generated by integrating bacterial luxAB genes encoding luciferase into the genome of P. cannabina pv. alisalensis phage PBSPCA1. The PBSPCA1::luxAB reporter phage is viable and stable and retains properties similar to those of the wildtype phage. PBSPCA1::luxAB rapidly and sensitively detects P. cannabina pv. alisalensis by conferring a bioluminescent signal response to cultured cells. Detection is dependent on cell viability. Other bacterial pathogens of Brassica species such as P. syringae pv. maculicola, Pseudomonas marginalis, Pectobacterium carotovorum, Xanthomonas campestris pv. campestris, and X. campestris pv. raphani either do not produce a response or produce significantly attenuated signals with the reporter phage. Importantly, the reporter phage detects P. cannabina pv. alisalensis on diseased plant specimens, indicating its potential for disease diagnosis.National Science Foundation Small Business Innovative Research 1012059U.S. Department of EducationU.S. Department of AgricultureCellular and Molecular Biolog
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Biomolecular and micromorphological analysis of suspected faecal deposits at Neolithic Çatalhöyük, Turkey
Changes in the ratio of tetraether to diether lipids in cattle feces in response to altered dietary ratio of grass silage and concentrates
<i>Saccharomyces cerevisiae </i>Atf1p is an alcohol acetyltransferase and a thioesterase <i>in vitro</i>
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