Lanthanide-containing complexes are important compounds for sophisticated nuclear-fuel processing and medical imaging. Moreover, they often have interesting symmetric crystal structures and associated dynamics that render ...
Analytical Chemistry
Aug 23, 2023
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24
After a highly lauded research campaign that successfully redesigned a hepatitis C drug into one of the leading drug treatments for COVID-19, scientists at the Department of Energy's Oak Ridge National Laboratory are now ...
Biochemistry
Aug 14, 2023
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65
Global warming is not just a modern issue, but has occurred numerous times over Earth's history, with one such event happening 304 million years ago during the Late Paleozoic Ice Age (which spanned from 340 to 290 million ...
A research team led by Prof. Chen Yuxing and Prof. Zhou Cong from the University of Science and Technology of China (USTC) of the Chinese Academy of Sciences (CAS) recently utilized single-particle cryogenic electron microscopy ...
Cell & Microbiology
Jul 28, 2023
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63
How to harness the potential of highly reactive radical molecules to work in pairs and spur transformative chemistry?
Analytical Chemistry
Jul 17, 2023
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44
A group led by researchers at Nagoya University in Japan has developed a technology to capture and release cell-free DNA (cfDNA) on nanowire surfaces from urine. By extracting this DNA, they were able to successfully detect ...
Bio & Medicine
Jul 3, 2023
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184
Just as space holds infinite mysteries, when we zoom in at the level of biomolecules (one trillion times smaller than a meter), there is still so much to learn.
Molecular & Computational biology
Jun 22, 2023
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570
A quartet of chemists at the University of Oxford has, for the first time, found a way to get two beryllium atoms to bond with one another in a complex compound. In their paper published in the journal Science, Josef Boronski, ...
A Freie Universität Berlin research team headed by quantum physicist Professor Christiane Koch has demonstrated how hydrogen molecules behave when they collide with noble gas atoms such as helium or neon. In an article published ...
Quantum Physics
Jun 5, 2023
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702
Synthetic organic polymers are typically insoluble polycrystalline or amorphous products rather than single crystals. The direct synthesis of single-crystal porous polymers remains a challenge in polymer science and crystal ...
Polymers
May 15, 2023
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135
A hydrogen bond is the attractive interaction of a hydrogen atom with an electronegative atom, like nitrogen, oxygen or fluorine (thus the name "hydrogen bond", which must not be confused with a covalent bond to hydrogen). The hydrogen is covalently bonded to another electronegative atom. The energy of a hydrogen bond (typically 5 to 30 kJ/mole) is comparable to that of weak covalent bonds (155 kJ/mol), and a typical covalent bond is only 20 times stronger than an intermolecular hydrogen bond. These bonds can occur between molecules (intermolecularly), or within different parts of a single molecule (intramolecularly). The hydrogen bond is stronger than a van der Waals interaction, but weaker than covalent, or ionic bonds. This type of bond occurs in both inorganic molecules such as water and organic molecules such as DNA.
Intermolecular hydrogen bonding is responsible for the high boiling point of water (100 °C). This is because of the strong hydrogen bond, as opposed to other group 16 hydrides. Intramolecular hydrogen bonding is partly responsible for the secondary, tertiary, and quaternary structures of proteins and nucleic acids.
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