3 research outputs found
Genomic resource development of shellfish of conservation concern
<p>**This is a pre-peer reviewed versio of the following article: Timmins-Schiffman EB, Friedman CS, Metzger DC, White SJ, Roberts SB (2012) Genomic resource development for shellfish of conservation concern. Molecular Ecology Resources, doi: 10.1111/1755-0998.12052, which has been published in final form at http://onlinelibrary.wiley.com/doi/10.1111/1755-0998.12052/abstract**</p>
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<p>Effective conservation of threatened species depends on the ability to assess organism physiology and population demography. In order to develop genomic resources to better understand the dynamics of two ecologically vulnerable species in the Pacific Northwest of the United States, larval transcriptomes were sequenced for the pinto abalone <em>Haliotis kamtschatkana kamtschatkana </em>and the Olympia oyster <em>Ostrea lurida</em>. Based on comparative species analysis the <em>Ostrea lurida </em>transcriptome (41,136 contigs) is relatively complete. These transcriptomes represent the first significant contribution to genomic resources for both species. Genes are described based on biological function with a particular attention to those associated with temperature change, oxidative stress, and immune function. In addition, transcriptome derived genetic markers are provided. Together, these resources provide valuable tools for future studies aimed at conservation of <em>Haliotis kamtschatkana, Ostrea lurida </em>and related species.</p
Facile Synthesis of Titania Nanowires via a Hot Filament Method and Conductometric Measurement of Their Response to Hydrogen Sulfide Gas
Titania nanostructures are of increasing interest for
a variety of applications, including photovoltaics, water splitting,
and chemical sensing. Because of the photocatalytical properties of
TiO<sub>2</sub>, chemical processes that occur at its surface can
be exploited for highly efficient nanodevices. A facile and fast synthesis
route has been explored that is free of catalysts or templates. An
environmental scanning electron microscopy (ESEM) system was employed
to grow titania nanowires (NWs) in a water vapor atmosphere (∼1
mbar) and to monitor the growth in situ. In addition, the growth process
was also demonstrated using a simple vacuum chamber. In both processes,
a titanium filament was heated via the Joule effect and NWs were found
to grow on its surface, as a result of thermal oxidation processes.
A variety of nanostructures were observed across the filament, with
morphologies changing with the wire temperature from the center to
the end points. The longest NWs were obtained for temperatures between
∼730
°C and 810 °C. Typically, they have an approximate thickness
of ∼300 nm and lengths of up to a few micrometers. Cross sections
prepared by focused-ion-beam milling revealed the presence of a porous
layer beneath the NW clusters. This indicates that the growth of NWs
is driven by oxidation-induced stresses in the subsurface region of
the Ti filament and by enhanced diffusion along grain boundaries.
To demonstrate the potential of titania NWs grown via the hot filament
method, single NW devices were fabricated and used for conductometric
sensing of hydrogen sulfide (H<sub>2</sub>S) gas. The NW electric
resistance was found to decrease in the presence of H<sub>2</sub>S.
Its variation can be explained in terms of the surface depletion model
Developing Fast Code Through High-Level Annotations
Poster presented at SIAM CSE17 PP108 Minisymposterium: Software Productivity and Sustainability for CSE and Data Scienc