Oceanic iron (Fe) fertilization experiments have advanced the understanding of how Fe regulates biological productivity and air-sea carbon dioxide (CO(2)) exchange. However, little is known about the production and consumption of halocarbons and other gases as a result of Fe addition. Besides metabolizing inorganic carbon, marine microorganisms produce and consume many other trace gases. Severa...

Neural stem cells (NSCs) reside in a hypoxic microenvironment within the brain. However, the crucial transcription factors (TFs) that regulate NSC biology under physiologic hypoxia are poorly understood. Here we have performed gene set enrichment analysis (GSEA) of microarray datasets from hypoxic versus normoxic NSCs with the aim of identifying pathways and TFs that are activated under oxygen ...

Introduction Probably the biggest source of confusion and controversy involving confined spaces is the acceptable limit for atmospheres deficient or enriched in oxygen. This confusion and controversy has arisen, in part, because oxygen is essential for life, and because people can adapt in both the short-term and the longterm to oxygen levels both greater than and less than they are at sea leve...

Large numbers of people live or work at high altitude, and many visit to trek or ski. The inevitable hypoxia impairs physical working capacity, and at higher altitudes there is also cognitive impairment. Twenty years ago oxygen enrichment of room air was introduced to reduce the hypoxia, and this is now used in dormitories, hotels, mines, and telescopes. However, recent advances in technology n...

Archean banded iron formations (BIF) represent a major contributor to better constraining and assessing the paleogeography evolution of cratons. In this context, we conducted an exhaustive sampling analysis campaign BIF units in Congo Craton, covering several greenstone belts within Ivindo, Kelle-Mbomo, Chaillu blocks. The REE + Y patterns suggest: (1) Interaction seawater with Fe-oxyhydroxides...

Methanogenesis is a major metabolic pathway long associated with strictly anaerobic conditions predominantly due in part to the high sensitivity of obligate methanogenic archaea to oxygen toxicity. However, there is increasing evidence that methanogenic archaea can survive prolonged periods of oxygen stress in both pure culture and environmental conditions. The molecular defense mechanisms agai...

the hybrid molten/solid in2o3 - 30-48 wt.% bi2o3 oxide materials were studied with respect to their transport properties. the conductivities, oxygen ion transport numbers and oxygen permeation fluxes have been measured by using the four-probe dc, volumetric measurements of the faradaic efficiency and gas flow techniques, respectively. we show that the oxygen permeability of the hybrid molten/so...

introduction: oxygen is a drug and physician and nurses should be familiar with the effects and potential risks of oxygen therapy. the current study aimed to assess familiarity of physicians and nurses with various aspects of oxygen therapy. method: in this cross sectional study, the familiarity of physicians and nurses with various aspects of oxygen therapy in a teaching hospital was evaluated...

In this paper we make comparisons between the observed stable isotopic composition of leaf water and the predictions of the Craig-Gordon model of isotopic enrichment when plants (Cornus stolonifera L.) were exposed to natural, diurnal changes in temperature and humidity in a glasshouse. In addition, we determined the effects of mild water stress on the isotopic composition of leaf water. The mo...

Methane emissions from rice grown within Temperature Gradient Greenhouse Tunnels under doubled CO2 concentrations were 10±45 times less than emissions from control plants grown under ambient CO2. For two cultivars of rice (cvs. Lemont and IR-72), methane emissions increased with a temperature increase of 2°, from outdoor ambient temperatures to the ®rst cell of the ambient CO2 tunnel (ambient t...