Sentences with phrase «on iron molecules»

«Solar cells of the future could be based on iron molecules.»

Not exact matches

Thriving in environments that lacked oxygen, they relied on compounds such as carbon dioxide, sulfur - containing molecules or iron minerals that act as oxidizing agents to break down food.

I knew that heme, the oxygen - carrying molecule in hemoglobin, contained an iron atom within a porphyrin ring (for more information on porphyrin chemistry see this site at Washburn University), but Dr. Datta - Gupta and his laboratory technician attempted to chemically add different metals such as copper, magnesium, or manganese to porphyrins using column chromatography.

These molecules, which have great similarities to the iron porphyrins that are found in natural blood, were adsorbed on a gold metal surface.

While this current study builds on that research, there are no definitive conclusions as to why or how the iron sulfates became chemically bonded to water molecules.

Certain particle compounds may directly generate ROS in vivo because of their surface chemistry (eg, metals, organic compounds, and semiquinones) or after bioactivation by cytochrome P450 systems (eg, polycyclic aromatic hydrocarbon conversion to quinones).6, 290 a, 290 b A particle surface or anions present on otherwise more inert particles may disrupt iron homeostasis in the lung and thereby also generate ROS via Fenton reactions.291 Other PM constituents may do so indirectly by the upregulation of endogenous cellular sources (eg, nicotinamide adenine dinucleotide phosphate [NADPH]-RRB- oxidase) 292,293 or by perturbing organelle function (eg, mitochondria) by taken - up PM components.261 Particle stimulation of irritant and afferent ANS fibers may also play a role in local and systemic oxidative stress formation.294 Given the rich antioxidant defenses in the lung fluid, secondarily generated oxidization products of endogenous molecules (eg, oxidized phospholipids, proteins) or a reduction in endogenous antioxidants per se may be responsible at least in part for the state of oxidative stress in the lungs (along with instigating the subsequent cellular responses) rather than ROS derived directly from PM and its constituents.

Over the years, he's performed fascinating studies on frog eggs, mitochondria, protein macro - molecules, liver and hepatoma cells, iron overload, and interactions between electron beams with solid - state salts.