Search: authors:"J. M. Williams"

The role of the medial prefrontal cortex in attention: Altering predictability of task difficulty

Rats were trained on a signal detection task in which a light (200 or 500 msec) appeared randomly over one of three levers. The rat was required to press the illuminated lever. There were two versions of the task: a light detection-random (LDR) and a light detection-block (LDB) task that differed only in the predictability of the difficulty level of the upcoming stimuli (LDR...

Prevention of heterotopic ossification after spinal cord injury with COX-2 selective inhibitor (rofecoxib)

Study design: A randomized, prospective, double-blind, placebo-controlled clinical trial.Objectives: To determine the effect of COX-2-selective inhibitor on the prevention of heterotopic ossification (HO) after spinal cord injury (SCI).Setting: County and University Teaching Hospital, Miami, FL, USA.Methods: A total of 76 patients were enrolled in the study. Among them, 39...

Fluid Sampling under Adverse Conditions

Science Support Services FLUID SAMPLING UNDER ADVERSE CONDITIONS (1) Le Grand Vignoble, 42330 Saint-Galmier - France - J. M. WILLIAMS Des échantillons valables sont essentiels pour bien

Observations of turbulence beneath sea ice in southern McMurdo Sound, Antarctica

The first turbulence profiler observations beneath land fast sea ice which is directly adjacent to an Antarctic ice shelf are described. The stratification in the 325 m deep water column consisted of a layer of supercooled water in the upper 40 m lying above a quasi-linearly stratified water column with a sharp step in density at mid-depth. Turbulent energy dissipation rates were...

Flow and mixing near a glacier tongue: a pilot study

A glacier tongue floating in the coastal ocean presents a significant obstacle to the local flow and so influences oceanic mixing and transport processes. Here acoustic Doppler current profiler and shear microstructure observations very near to a glacier tongue side-wall capture flow accelerations and associated mixing. Flow speeds reached around 40 cm s−1, twice that of the...

An algal photoprotection index and vertical mixing in the Southern Ocean

We explored the relationship between mixing dynamics in the surface mixed layer and the photoprotective response of phytoplankton. The distribution of photoprotective pigments was determined at 15 stations in subantarctic waters southeast of New Zealand during austral autumn. The first-order kinetics of the phytoplankton photoprotective response to both light and dark was...

Association of aberrant neural synchrony and altered GAD67 expression following exposure to maternal immune activation, a risk factor for schizophrenia

BilkeyBrain Health Research Centre, University of Otago, Dunedin, New ZealandD D Dickerson, K A Overeem, A R Wolff, J M Williams, W C Abraham & D K BilkeyDepartment of Anatomy, University of Otago, Dunedin, New ... ZealandK A Overeem & J M Williams AuthorsSearch for D D Dickerson in:Nature Research journals • PubMed • Google ScholarSearch for K A Overeem in:Nature Research journals • PubMed • Google ScholarSearch for A

Estimating carbonate parameters from hydrographic data for the intermediate and deep waters of the Southern Hemisphere oceans

Using ocean carbon data from global datasets, we have developed several multiple linear regression (MLR) algorithms to estimate alkalinity and dissolved inorganic carbon (DIC) in the intermediate and deep waters of the Southern Hemisphere (south of 25° S) from only hydrographic data (temperature, salinity and dissolved oxygen). A Monte Carlo experiment was used to identify a...

Author Correction: Mice lacking NF-κB1 exhibit marked DNA damage responses and more severe gastric pathology in response to intraperitoneal tamoxifen administration

Fluid Sampling under Adverse Conditions

Science Support Services FLUID SAMPLING UNDER ADVERSE CONDITIONS (1) Le Grand Vignoble, 42330 Saint-Galmier - France - J. M. WILLIAMS Des échantillons valables sont essentiels pour bien