1,800 research outputs found
Do Macroalgal Environments Leave a Geological Signature? Modern Test Case from Kaikoura, New Zealand
Brown, red and green macroalgae in modern temperate marine environments are
ecosystem‐forming primary producers on rocky substrates, yet they have a poor
preservation potential and few fossil examples are known from the rock record.
Macroalgal forests, as carbonate producers, are largely unrecognised within the coolwater
carbonate realm even though they host a wide variety of calcareous organisms
with good preservational potential. Some species of molluscs, sea urchins and
crustaceans only live within the understorey of macroalgal forests. These, and other,
calcareous flora and fauna are the key to identification of macroalgae environments in
the rock record.
Modern macroalgae forests at Kaikoura, New Zealand, exhibit a clear zonation of
calcareous components controlled by substrate topography, wave exposure, water
depth and light penetration. The prominent live calcareous components include
encrusting and foliose coralline red algae, molluscs, bryozoans, echinoderms,
calcareous worms, ascidians and crustaceans, as well as sponges and other soft bodied
invertebrates. The sediments accumulated beneath and adjacent to the algae at
Kaikoura are bioclastic, terrigenous sands and gravels; with bioclasts of coralline algal
fragments and rhodoliths, barnacles, molluscs, spirorbids and bryozoans. Although the
shallow, wave exposed settings that promote growth of macroalgal forests are limited
in areal extent, their contribution via skeletal carbonate may be considerable.
In the rock record, terrigenous sands and gravels rich in coralline, barnacle, mollusc,
and bryozoan fragments, that occur in association with hard‐substrate unconformities
in a cool‐water realm, must be considered as representatives of past macroalgal
environments
Stable isotope values in modern bryozoan carbonate from New Zealand and implications for paleoenvironmental interpretation
Bryozoan carbonate contains useful geochemical evidence of temperate shelf paleoenvironments. Stable isotope values were determined for 103 modern marine bryozoan skeletons representing 30 species from New Zealand. δ18O values range from -1.4 to 2.8 VPDB, while δ13C range from -4.5 to 2.8 VPDB (values uncorrected for mineralogical variation). These values are distinct from those of both tropical marine skeletons and New Zealand Tertiary fossils. Most bryozoans secrete carbonate in or near isotopic equilibrium with sea water, except for Celleporina and Steginoporella. The complex and variable mineralogies of the bryozoans reported here make correction for mineralogical effects problematic. Nevertheless, mainly aragonitic forms display higher isotope values, as anticipated. Both temperature and salinity constrain δ18O and δ13C values, and vary with latitude and water depth. Ten samples from a single branch of Cinctipora elegans from the Otago shelf cover a narrow range, although the striking difference in carbon isotope values between the endozone and exozone probably reflects different mineralisation histories. Our stable isotope results from three different laboratories on a single population from a single location are encouragingly consistent. Monomineralic bryozoans, when carefully chosen to avoid species suspected of vital fractionation, have considerable potential as geochemical paleoenvironmental indicators, particularly in temperate marine environments where bryozoans are dominant sediment producers
Ferromagnetic Quantum Critical Point in CePdP with Pd Ni Substitution
An investigation of the structural, thermodynamic, and electronic transport
properties of the isoelectronic chemical substitution series
Ce(PdNi)P is reported, where a possible ferromagnetic
quantum critical point is uncovered in the temperature - concentration ()
phase diagram. This behavior results from the simultaneous contraction of the
unit cell volume, which tunes the relative strengths of the Kondo and RKKY
interactions, and the introduction of disorder through alloying. Near the
critical region at 0.7, the rate of contraction of the
unit cell volume strengthens, indicating that the cerium -valence crosses
over from trivalent to a non-integer value. Consistent with this picture, x-ray
absorption spectroscopy measurements reveal that while CePdP has a
purely trivalent cerium -state, CeNiP has a small ( 10 \%)
tetravalent contribution. In a broad region around , there is a
breakdown of Fermi liquid temperature dependences, signaling the influence of
quantum critical fluctuations and disorder effects. Measurements of clean
CePdP furthermore show that applied pressure has a similar initial
effect to alloying on the ferromagnetic order. From these results,
CePdP emerges as a keystone system to test theories such as the
Belitz-Kirkpatrick-Vojta model for ferromagnetic quantum criticality, where
distinct behaviors are expected in the dirty and clean limits.Comment: 9 pages, 8 figure
Analysis of hydrographic and stable isotope data to determine water masses, circulation, and mixing in the eastern Great Australian Bight
Extent: 14p.Hydrographic and stable isotope data from waters in the eastern Great Australian Bight (GAB) sampled during March–April 1998 indicate that both mixing and evaporative processes are important on the shelf. Five water masses are defined on the basis of their temperature, salinity, δ 2H and δ 18O values. Two of these are end-members, the Flinders Current (FC) and the Great Australian Bight Plume (GABP), whereas the other three are a result of mixing between these two end-members. Water mass distribution reflects an anticyclonic gyre in the eastern GAB. Cool and fresh water present at depth along the Eyre Peninsula is sourced from upwelling of Flinders Current water directly from the shelf break. This water is progressively heated, evaporated, and mixed with warmer and more saline shelf waters as it flows around the gyre. High temperatures, salinities, and δ 2H values in surface waters in the central GAB suggest that the Great Australian Bight Plume has a greater spatial extent than previously recorded, also occurring along the shelf edge between 130°E and 133°E. A high temperature, high salinity, low δ 2H water mass that is isotopically similar to the Flinders Current occurs in the west of the study area, indicating intrusion of Flinders Current water into the central GAB. Differences in isotopic compositions of off-shelf water suggest that the Great Australian Bight Plume is flowing off the shelf and mixing with Flinders Current water at ∼132°E; however, this outflow does not generate an eastward flowing current during the period when samples were collected.Laura E. Richardson, T. Kurt Kyser, Noel P. James and Yvonne Bon
Distributed agents for online spatial searches
As the availability and utilisation of online data blossoms, automated online searches—whether to answer a simple question, seek specific sensor readings, or investigate research in a particular domain—have raised a number of issues. Simple search tools do not access the deep web of services and online forms, and cannot handle knowledge domain-specific search problems, but specialist search tools can have a narrow domain and applicability. Some online tools circumvent these problems by putting more filter controls into the hands of users, but this leads to more complex interfaces which can raise usability barriers. A distributed approach, where specialised search agents act autonomously to find contextualised information, can provide a useful compromise between a simple, general search interface and specialist searches. This paper outlines work in progress on design and use of specialist search agents, with a case study to find public transportation bus stops within a spatial region. The approach is demonstrated with a proof of concept web interface, developed to interpret a text query to find and show bus stop locations within a named boundary by coordinating multiple online search agents. Search agents were designed to follow a common model to allow for future development of agent types, including specialist agents used in the case study to search standard open web services and extract spatial features
Evidence Of Protein Collective Motions On The Picosecond Time Scale
We investigate the presence of structural collective motions on a picosecond
time scale for the heme protein, cytochrome c, as a function of oxidation and
hydration, using terahertz (THz) time-domain spectroscopy and molecular
dynamics simulations. The THz response dramatically increases with oxidation,
with the largest increase for lowest hydrations and highest frequencies. For
both oxidation states the THz response rapidly increases with hydration
saturating above ~25% (g H2O/g protein). Quasi-harmonic vibrational modes and
dipole-dipole correlation functions are calculated from molecular dynamics
trajectories. The collective mode density of states alone reproduces the
measured hydration dependence providing strong evidence of the existence of
these motions. The large oxidation dependence is reproduced only by the
dipole-dipole correlation function, indicating the contrast arises from
diffusive motions consistent with structural changes occurring in the vicinity
of a buried internal water molecule
Natural images from the birthplace of the human eye
Here we introduce a database of calibrated natural images publicly available
through an easy-to-use web interface. Using a Nikon D70 digital SLR camera, we
acquired about 5000 six-megapixel images of Okavango Delta of Botswana, a
tropical savanna habitat similar to where the human eye is thought to have
evolved. Some sequences of images were captured unsystematically while
following a baboon troop, while others were designed to vary a single parameter
such as aperture, object distance, time of day or position on the horizon.
Images are available in the raw RGB format and in grayscale. Images are also
available in units relevant to the physiology of human cone photoreceptors,
where pixel values represent the expected number of photoisomerizations per
second for cones sensitive to long (L), medium (M) and short (S) wavelengths.
This database is distributed under a Creative Commons Attribution-Noncommercial
Unported license to facilitate research in computer vision, psychophysics of
perception, and visual neuroscience.Comment: Submitted to PLoS ON
The caspase-6–p62 axis modulates p62 droplets based autophagy in a dominant-negative manner
AbstractSQSTM1/p62, as a major autophagy receptor, forms droplets that are critical for cargo recognition, nucleation, and clearance. p62 droplets also function as liquid assembly platforms to allow the formation of autophagosomes at their surfaces. It is unknown how p62-droplet formation is regulated under physiological or pathological conditions. Here, we report that p62-droplet formation is selectively blocked by inflammatory toxicity, which induces cleavage of p62 by caspase-6 at a novel cleavage site D256, a conserved site across human, mouse, rat, and zebrafish. The N-terminal cleavage product is relatively stable, whereas the C-terminal product appears undetectable. Using a variety of cellular models, we show that the p62 N-terminal caspase-6 cleavage product (p62-N) plays a dominant-negative role to block p62-droplet formation. In vitro p62 phase separation assays confirm this observation. Dominant-negative regulation of p62-droplet formation by caspase-6 cleavage attenuates p62 droplets dependent autophagosome formation. Our study suggests a novel pathway to modulate autophagy through the caspase-6–p62 axis under certain stress stimuli.</jats:p
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