These are organized by a classification scheme developed exclusively for Cosma. More…
NIST Chemistry WebBook
Physical and Chemical Properties Resources (UC Berkeley Physics and Astronomy Library)
CRC Handbook of Chemistry and Physics Online (99th Edition)
ChemSpider: Free Chemical Structure Database
Chemistry Calculators (Calculator.com)
matter : material substance that occupies space, has mass, and is composed predominantly of atoms consisting of protons, neutrons, and electrons, that constitutes the observable universe, and that is interconvertible with energy — Webster
Matter is any substance that has mass and takes up space by having volume. All everyday objects that we can touch are ultimately composed of atoms, which are made up of interacting subatomic particles, and in everyday as well as scientific usage, “matter” generally includes atoms and anything made up of them, and any particles (or combination of particles) that act as if they have both rest mass and volume. However it does not include massless particles such as photons, or other energy phenomena or waves such as light or sound.
Matter exists in various states (also known as phases). These include classical everyday phases such as solid, liquid, and gas – for example water exists as ice, liquid water, and gaseous steam – but other states are possible, including plasma, Bose–Einstein condensates, fermionic condensates, and quark–gluon plasma.
Usually atoms can be imagined as a nucleus of protons and neutrons, and a surrounding “cloud” of orbiting electrons which “take up space”. However this is only somewhat correct, because subatomic particles and their properties are governed by their quantum nature, which means they do not act as everyday objects appear to act – they can act like waves as well as particles and they do not have well-defined sizes or positions.
In the Standard Model of particle physics, matter is not a fundamental concept because the elementary constituents of atoms are quantum entities which do not have an inherent “size” or “volume” in any everyday sense of the word. Due to the exclusion principle and other fundamental interactions, some “point particles” known as fermions (quarks, leptons), and many composites and atoms, are effectively forced to keep a distance from other particles under everyday conditions; this creates the property of matter which appears to us as matter taking up space. — Wikipedia
Chemistry is the scientific discipline involved with compounds composed of atoms, i.e. elements, and molecules, i.e. combinations of atoms: their composition, structure, properties, behavior and the changes they undergo during a reaction with other compounds. Chemistry addresses topics such as how atoms and molecules interact via chemical bonds to form new chemical compounds. — Wikipedia
Journal of the American Chemical Society: Latest Articles (ACS Publications) latest articles published in Journal of the American Chemical Society
[ASAP] Tracking Electrical Fields at the...
by Jaeyune Ryu and Yogesh Surendranath* on September 18, 2019 at 4:00 am
Journal of the American Chemical SocietyDOI: 10.1021/jacs.9b05148
by Madalina T. Mihai, Benjamin D. Williams, and Robert J. Phipps* on September 18, 2019 at 4:00 am
Journal of the American Chemical SocietyDOI: 10.1021/jacs.9b07267
[ASAP] Scalable and Template-Free Aqueous...
by Kaikai Ma†‡, Timur Islamoglu‡, Zhijie Chen‡, Peng Li‡, Megan C. Wasson‡, Yongwei Chen‡, Yuanfeng Wang†, Gregory W. Peterson?, John H. Xin*†, and Omar K. Farha*‡§ on September 18, 2019 at 4:00 am
Journal of the American Chemical SocietyDOI: 10.1021/jacs.9b07301
[ASAP] Operando Characterization of Iron...
by Zhu Chen†, Song Jiang†, Gyeongwon Kang†, Duc Nguyen†, George C. Schatz*†, and Richard P. Van Duyne*†‡ on September 18, 2019 at 4:00 am
Journal of the American Chemical SocietyDOI: 10.1021/jacs.9b07979
[ASAP] Spotlights on Recent <italic...
by ACS Contributing Correspondents on September 18, 2019 at 4:00 am
Journal of the American Chemical SocietyDOI: 10.1021/jacs.9b10072
Nature Chemistry Nature Chemistry is a monthly journal dedicated to publishing high-quality papers that describe the most significant and cutting-edge research in all areas of chemistry. As well as reflecting the traditional core subjects of analytical, inorganic, organic and physical chemistry, the journal features a broad range of chemical research including, but not limited to, bioinorganic and bioorganic chemistry, catalysis, computational and theoretical chemistry, environmental chemistry, green chemistry, medicinal chemistry, organometallic chemistry, polymer chemistry, supramolecular chemistry and surface chemistry. Other multidisciplinary topics such as nanotechnology, chemical biology and materials chemistry are also featured.
Macrocyclic colibactin induces DNA double-strand...
by Zhong-Rui Li on September 16, 2019 at 12:00 am
Nature Chemistry, Published online: 16 September 2019; doi:10.1038/s41557-019-0317-7Colibactin is produced by human enterobacteria and assumed to be a gut bacterial genotoxin. Now, colibactin-645 has been identified as a macrocyclic colibactin metabolite that contains a C-terminal 5-hydroxy-4-oxazolecarboxylic acid moiety and induces DNA double-strand breaks in vitro and in human cell cultures via a unique copper-mediated oxidative mechanism.
Temperature-jump solution X-ray scattering...
by Michael C. Thompson on September 16, 2019 at 12:00 am
Nature Chemistry, Published online: 16 September 2019; doi:10.1038/s41557-019-0329-3Understanding how structural dynamics contribute to protein function is a longstanding challenge in structural biology. Now, time-resolved X-ray solution scattering following an infrared laser-induced temperature jump has been used to probe functional, intramolecular motions in the dynamic enzyme cyclophilin A.
The role of sugar-backbone heterogeneity and...
by Subhendu Bhowmik on September 16, 2019 at 12:00 am
Nature Chemistry, Published online: 16 September 2019; doi:10.1038/s41557-019-0322-xThe emergence of pristine RNA and DNA on the early Earth would have been hindered by a lack of specificity in their prebiotic syntheses. Now, it has been shown that chimeric sequences—with a mixture of RNA and DNA backbones—mediate the template-directed ligation of oligomers present in mixtures of nucleic acids, enabling the simultaneous appearance of RNA and DNA.
Super-resolution labelling with Action-PAINT
by Ninning Liu on September 16, 2019 at 12:00 am
Nature Chemistry, Published online: 16 September 2019; doi:10.1038/s41557-019-0325-7Super-resolution microscopy has enabled optical imaging of individual biomolecules on the nanometre scale. Now, a new method has been developed that allows active manipulation of single-molecule targets on visualization in a sequential manner. This method, called ‘Action-PAINT’, combines real-time super-resolution microscopy (DNA-PAINT) and photoinducible crosslinking chemistry to deliver a […]
Enzymatic control of cycloadduct conformation...
by Samuel S. Bailey on September 16, 2019 at 12:00 am
Nature Chemistry, Published online: 16 September 2019; doi:10.1038/s41557-019-0324-8The UbiD family of reversible decarboxylases interconvert propenoic or aromatic acids with the corresponding alkenes or aromatic compounds, using a transient 1,3-dipolar cycloaddition between the substrate and the prenylated flavin mononucleotide cofactor. Atomic-resolution crystallography shows targeted destabilization of the intermediate covalent adducts, allowing the enzyme to harness 1,3-dipolar […]
Geochemistry News -- ScienceDaily Earth and Climate Chemistry. Full text articles on organic and inorganic chemistry in the environment. Updated daily.
Modeling a model nanoparticle
on September 18, 2019 at 4:59 pm
New research introduces the first universal adsorption model that accounts for detailed nanoparticle structural characteristics, metal composition and different adsorbates, making it possible to not only predict adsorption behavior on any metal nanoparticles but screen their stability, as well.
DNA 'origami' takes flight in emerging field of...
on September 18, 2019 at 4:25 pm
'DNA mechanotechnology' is a new field to engineer DNA machines that generate, transmit and sense mechanical forces at the nanoscale.
Drug delivery: Thermo-responsive protein hydrogel
on September 18, 2019 at 1:31 pm
Bio-engineering researchers have created a biocompatible, protein-based hydrogel that could serve as a drug delivery system durable enough to survive in the body for more than two weeks while providing sustained medication release. The research advances an area of biochemistry that is also critical to tissue engineering and regenerative medicine. Protein hydrogels are more biocompatible than synthetic ones and do not require potentially toxic chemical crosslinkers.
Microbe chews through PFAS and other tough...
on September 18, 2019 at 12:32 pm
In a series of lab tests, a relatively common soil bacterium has demonstrated its ability to break down the difficult-to-remove class of pollutants called PFAS, researchers said.
Programmable swarmbots make flexible biological...
on September 17, 2019 at 5:30 pm
Biomedical engineers have developed a new platform to create biological drugs using specially engineered bacteria that burst and release useful proteins when they sense that their capsule is becoming too crowded.
Scientific American - Chemistry Science news and technology updates from Scientific American
A Newly Identified Protein May Be the Key to...
by Simon Makin on September 17, 2019 at 5:45 pm
Inactivating this protein in human cells and mice provided immunity to a range of viruses, but an effective treatment is still a long way off -- Read more on ScientificAmerican.com
Migrating Birds May Be Collateral Damage for a...
by Jim Daley on September 12, 2019 at 7:20 pm
Neonicotinoids may be partly responsible for declines in songbird populations -- Read more on ScientificAmerican.com
Chemical Tweak Recycles Polyurethane into Glue
by Christine Herman on September 5, 2019 at 1:00 am
It’s not easy to recycle polyurethane, so it’s usually tossed out or burned. But a chemical tweak can turn polyurethane into glue. Christine Herman reports. -- Read more on ScientificAmerican.com
Nanomachines, Jellyfish Hugs and Hurricane Dorian...
by Jeffery DelViscio on August 30, 2019 at 12:00 pm
Enjoy and loop on -- Read more on ScientificAmerican.com
Disappearing Plastics Stay Strong in the Shadows...
by Prachi Patel on August 26, 2019 at 9:00 pm
The material could form self-destructing drones or sensors -- Read more on ScientificAmerican.com
Chemistry News - Biochemistry, Polymers, Materials Science Phys.org provides the latest news on chemistry, biochemistry, polymers, materials science
Platinum-graphene fuel cell catalysts show...
on September 18, 2019 at 8:24 pm
Films of platinum only two atoms thick supported by graphene could enable fuel cell catalysts with unprecedented catalytic activity and longevity, according to a study published recently by researchers at the Georgia Institute of Technology.
New algorithms shown to accelerate...
on September 18, 2019 at 1:22 pm
Biopharmaceuticals are necessary, life-saving tools. But the process for making them is time-consuming and costly, particularly when it comes to the process of purification—the removal of unwanted elements like proteins, viruses, and DNA.
Researchers develop thermo-responsive protein...
on September 18, 2019 at 6:46 am
Imagine a perfectly biocompatible, protein-based drug delivery system durable enough to survive in the body for more than two weeks and capable of providing sustained medication release. An interdisciplinary research team led by Jin Kim Montclare, a professor of biomolecular and chemical engineering at the NYU Tandon School of Engineering, has created the first protein-engineered hydrogel that meets those criteria, advancing an area of biochemistry critical to not only to the future of drug […]
Programmable swarmbots help make flexible...
on September 17, 2019 at 4:24 pm
Biomedical engineers at Duke University have developed a new platform to create biologic drugs using specially engineered bacteria that burst and release useful proteins when they sense that their capsule is becoming too crowded.
Elusive compounds of greenhouse gas isolated
on September 17, 2019 at 3:58 pm
Nitrous oxide (N2O) is a potent atmospheric pollutant. Although naturally occurring, anthropogenic N2O emissions from intensive agricultural fertilisation, industrial processes, and combustion of fossil fuels and biomass are a major cause for concern. Researchers at the University of Warwick have isolated elusive transition metal compounds of N2O that provide clues into how it could be used in sustainable chemical technologies.