Sweating it out through exercise may be a New Year's resolution but it could also help to provide new insights into the state of your health, according to new sensing technology being developed at Simon Fraser University.
Jan 11, 2022
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Researchers at the University of California, San Diego Skaggs School of Pharmacy and Pharmaceutical Sciences used information collected from hundreds of skin swabs to produce three-dimensional maps of molecular and microbial ...
Mar 30, 2015
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Electronic cigarettes, or ECs, contain nicotine, solvents, and flavor chemicals, and are especially popular among young adults. In 2020, the Food and Drug Administration, or FDA, banned cartridge-based flavored EC pods, but ...
Aug 2, 2022
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More than 13 million pain-blocking epidural procedures are performed every year in the United States. Although epidurals are generally regarded as safe, there are complications in up to 10 percent of cases, in which the needles ...
Aug 12, 2016
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Researchers at the University of Alberta announced today that they have determined the chemical composition of human urine. The study, which took more than seven years and involved a team of nearly 20 researchers, has revealed ...
Sep 5, 2013
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Modifying stomach acid levels may not be enough to treat symptoms in neonates suspected of having gastroesophageal reflux disease. According to a study from Nationwide Children's Hospital, this is the first study to classify ...
Aug 8, 2011
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A compound—one of 27 million screened in a library of potential new drugs—reversed four types of chronic pain in animal studies, according to new research led by NYU College of Dentistry's Pain Research Center and published ...
Nov 13, 2023
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By genetically testing nearly 1,000 embryos, scientists have provided the most detailed analysis of embryo fate following human in vitro fertilization.
Oct 1, 2023
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The new chemical composition of the legal high 'poppers' is linked to retinal damage at the back of the eye, finds a small study published online in the British Journal of Ophthalmology.
Apr 10, 2017
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There are now high levels of sweet and fruit-flavored chemicals likely to appeal to young people in e-cigarette liquids ostensibly marketed as "tobacco-flavored," compared with a decade ago, finds research published today ...
Nov 3, 2022
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In chemistry, the empirical formula of a chemical compound is a simple expression of the relative numbers of each type of atom in it, or the simplest whole number ratio of atoms of each element present in a compound. An empirical formula makes no reference to isomerism, structure, or absolute number of atoms. The empirical formula is used as standard for most ionic compounds, such as CaCl2, and for macromolecules, such as SiO2. The term empirical refers to the process of elemental analysis, a technique of analytical chemistry used to determine the relative amounts of each element in a chemical compound.
In contrast, the molecular formula identifies a numbers of each type of atom in a molecule, and the structural formula also shows the structure of the molecule.
For example, the chemical compound n-hexane has the structural formula CH3CH2CH2CH2CH2CH3, which shows that it has 6 carbon atoms arranged in a straight chain, and 14 hydrogen atoms. Hexane's molecular formula is C6H14, and its empirical formula is C3H7, showing a C:H ratio of 3:7. Different compounds can have the same empirical formula. For example, glucose, formaldehyde and acetic acid have the same empirical formula, CH2O. This is the actual chemical formula for formaldehyde, but acetic acid has double the number of atoms and glucose has six times the number of atoms.
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