Chemicals in makeup, sunscreen may raise odds for dangerous pregnancy complication
Chemicals commonly found in sunscreen, makeup and other personal care products could be putting pregnancies at risk, a new study warns.
5 hours ago
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Chemicals commonly found in sunscreen, makeup and other personal care products could be putting pregnancies at risk, a new study warns.
5 hours ago
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With aging, collagen and elastin in the skin decrease, leading to sagging, fine lines and deep wrinkles. These changes often arise from oxidative stress, inflammation, and changes in enzyme activities.
Aug 13, 2024
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Eating a low-fat vegan diet reduces harmful inflammatory dietary compounds called advanced glycation end-products (AGEs) by 73%, compared to no reduction on a Mediterranean diet, according to new research by the Physicians ...
Aug 9, 2024
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The processes in the brain and body through which physical exercise reduces depressive symptoms have been explored by UCL researchers.
Jul 29, 2024
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When wounds happen, we want them to heal quickly and without complications, but sometimes infections and other complications prevent it. Chronic wounds are a significant health concern that affects tens of millions of Americans.
Jul 29, 2024
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Researchers at Western have found an over-the-counter natural health product may help counteract the negative effects of heavy cannabis use among adolescents aged 12 to 17, including depression, anxiety and diminished motivation ...
Jul 29, 2024
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The brain contains many cell types, from the prominent neurons to the lesser-known microglia. The latter are integral to the brain's immune system and play a crucial role as the brain's cleanup crew. A recent study conducted ...
Jul 26, 2024
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A study from China has reported that Cordyceps sinensis (CS), a traditional Chinese medicinal fungus, can ameliorate idiopathic pulmonary fibrosis (IPF) in mice by inhibiting mitochondrion-mediated oxidative stress.
Jul 26, 2024
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Ultrafine particles, UFPs, the smallest contributors to air pollution, hinder the function of mitochondria in human olfactory mucosa cells, a new study shows. Led by the University of Eastern Finland, the research showed ...
Jul 24, 2024
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The hormone estrogen helps keep blood vessels open and flexible and is generally thought to help protect women from heart disease. These higher estrogen levels may lead to fewer heart attacks and strokes in premenopausal ...
Jul 23, 2024
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An oxide ( /ˈɒksaɪd/) is a chemical compound that contains at least one oxygen atom in its chemical formula. Metal oxides typically contain an anion of oxygen in the oxidation state of −2.
Most of the Earth's crust consists of solid oxides. Oxides result when elements are oxidized by oxygen in air. Combustion of hydrocarbons affords the two principal oxides of carbon, carbon monoxide and carbon dioxide. Even materials that are considered to be pure elements often contain a coating of oxides. For example, aluminium foil has a thin skin of Al2O3 that protects the foil from further corrosion.
Virtually all elements burn in an atmosphere of oxygen, or an oxygen rich environment. In the presence of water and oxygen (or simply air), some elements—lithium, sodium, potassium, rubidium, caesium, strontium and barium—react rapidly, even dangerously, to give the hydroxides. In part for this reason, alkali and alkaline earth metals are not found in nature in their metallic, i.e., native, form. Caesium is so reactive with oxygen that it is used as a getter in vacuum tubes, and solutions of potassium and sodium, so called NaK are used to deoxygenate and dehydrate some organic solvents. The surface of most metals consists of oxides and hydroxides in the presence of air. A well known example is aluminium foil, which is coated with a thin film of aluminium oxide that passivates the metal, slowing further corrosion. The aluminium oxide layer can be built to greater thickness by the process of electrolytic anodising. Although solid magnesium and aluminium react slowly with oxygen at STP, they, like most metals, will burn in air, generating very high temperatures. Finely grained powders of most metals can be dangerously explosive in air. Consequently, they are often used in Solid-fuel rockets.
In dry oxygen, iron readily forms iron(II) oxide, but the formation of the hydrated ferric oxides, Fe2O3−2x(OH)x, that mainly comprise rust, typically requires oxygen and water. The production of free oxygen by photosynthetic bacteria some 3.5 billion years ago precipitated iron out of solution in the oceans as Fe2O3 in the economically important iron ore hematite.
Due to its electronegativity, oxygen forms chemical bonds with almost all elements to give the corresponding oxides. Noble metals (such as gold or platinum) resist direct chemical combination with oxygen, and substances like gold(III) oxide must be generated by indirect routes.
This text uses material from Wikipedia, licensed under CC BY-SA