Partial pressures of carbon dioxide ( pCO2) were measured in river and coastal waters on two cruises in November 1999 and June 2000 on the Southwest Florida Shelf. Supersaturation with respect to the atmosphere was observed for most river and nearshore waters in November 1999. pCO2 ranged from 403 Aatm in the Gulf of Mexico to 1280 Aatm in the Shark River. The coastal waters of the Southwest Fl...

It is well known that the equilibration timescale for the isotopic ratios 13C/12C and 14C/12C in the ocean mixed layer is on the order of a decade, 2 orders of magnitude slower than for oxygen. Less widely appreciated is the fact that the equilibration timescale is quite sensitive to the speciation of dissolved inorganic carbon (DIC) in the mixed layer, scaling linearly with the ratio DIC/CO2, ...

Elevated pCO2 and warming are generally expected to influence cyanobacterial growth, and may promote the formation of blooms. Yet, both climate change factors may also influence cyanobacterial mortality by favoring pathogens, such as viruses, which will depend on the ability of the host to adapt. To test this hypothesis, we grew Plectonema boryanum IU597 under two temperature (25 and 29°C) and ...

Rising atmospheric CO2 concentrations threaten coral reefs globally by causing ocean acidification (OA) and warming. Yet, the combined effects of elevated pCO2 and temperature on coral physiology and resilience remain poorly understood. While coral calcification and energy reserves are important health indicators, no studies to date have measured energy reserve pools (i.e., lipid, protein, and ...

Early life history stages of marine organisms are generally thought to be more sensitive to environmental stress than adults. Although most marine invertebrates are broadcast spawners, some species are brooders and/or protect their embryos in egg or capsules. Brooding and encapsulation strategies are typically assumed to confer greater safety and protection to embryos, although little is known ...

A low intramucosal pH (pHi) and an increase in the difference between gastric mucosal and arterial PCO2 (PCO2 gap) reflect splanchnic hypoperfusion and are good indicators of poor prognosis. Previously, some randomised controlled trials (RCTs) were performed based on the theory that normalising the low pHi or PCO2 gap could improve the outcomes of critical care patients. However, these RCTs yie...

It has been proposed that increasing levels of pCO2 in the surface ocean will lead to more partitioning of the organic carbon fixed by marine primary production into the dissolved rather than the particulate fraction. This process may result in enhanced accumulation of dissolved organic carbon (DOC) in the surface ocean and/or concurrent accumulation of transparent exopolymer particles (TEPs), ...

Hyperventilation reduces partial pressure of CO2 (PCO2) in the blood, which results in hypokalaemia. Hypokalaemia helps the development of the life-threatening torsades de pointes type ventricular arrhythmia (TdP) evoked by repolarization delaying drugs. This implies that hyperventilation may assist the development of proarrhythmic events. Therefore, this study experimentally investigated the e...

The corrosion behaviour of 3Cr steel at CO2 partial pressures (pCO2) 2.7/28.5 bar and 200 °C was investigated. evolution double-layered scales analysed by surface analysis to identify physical chemical nature results are combined with an thermodynamic calculations. Both experimental show that the comprise a crystalline FeCO3 outer layer inner Fe3O4, FeCr2O4, Cr(OH)3 2.7 pCO2. At 28.5 pCO2, evol...