نتایج جستجو برای: crow
تعداد نتایج: 1723 فیلتر نتایج به سال:
The Little Bighorn River flows through the Crow Indian Reservation in Montana. In 2008, Escherichia coli concentrations as high as 7179 MPN/100 ml were detected in the river at the Crow Agency Water Treatment Plant intake site. During 2008, 2009, and 2012, 10 different serotypes of E. coli, including O157:H7, harboring both intimin and Shiga toxin genes were isolated from a popular swim site of...
All-optical regenerative NRZ-to-RZ format conversion using coupled ring-resonator optical waveguide.
This paper proposes a scheme for format conversion from a distorted non-return-to-zero (NRZ) signal to a high-quality return-to-zero (RZ) signal, using the nonlinearity in a coupled ring-resonator optical waveguide (CROW) on a silicon chip. In this method, a distorted NRZ signal is amplified and fed into the CROW together with an RZ pulse train. The CROW performs as a nonlinear step gate for th...
Animals rarely solve problems spontaneously. Some bird species, however, can immediately find a solution to the string-pulling problem. They are able to rapidly gain access to food hung on the end of a long string by repeatedly pulling and then stepping on the string. It is currently unclear whether these spontaneous solutions are produced by insight or by a perceptual-motor feedback loop. Here...
A recent study found that tool-manufacturing New Caledonian crows spontaneously solved a metatool task in which the birds used a tool to obtain a second, longer tool that could then be used to obtain food that was otherwise out of reach.
Although predator control programmes rarely consider complex competitive interactions among predators, it is becoming clear that removal of larger 'superior' competitors often releases the 'inferior' ones and can precipitate trophic cascades. In contrast, our study indicates that culling hooded crows Corvus cornix appears to release a larger competitor, the common raven Corvus corax. Ravens ran...
Molecular Basis for Differential Dioxin Sensitivity in Birds: Characterization of Avian AHR Isoforms
Our previous study demonstrated that avian species possesses two distinct aryl hydrocarbon receptors (AHR1 and AHR2). To elucidate the functional characterization of avian AHRs, 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD) binding affinities and in vitro DRC-induced transcriptional activities of AHR isoforms from chicken (Gallus gallus), black-footed albatross (Phoebastria nigripes), common cormo...
The New Caledonian crow in the wild ................................................................................................................ 4 Natural history............................................................................................................................................... 4 Tool use................................................................................
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