Hydrogen bonds play an important role in an overwhelming variety of fields from biology to surface and supramolecular chemistry. The term "hydrogen bond" refers to a wide range of interactions with various covalent and polar contributions. In particular, hydrogen bonds have an important role in the folding and packing of peptides and nucleic acids. Recent studies also point to the importance of...

Differential scanning calorimetry and X-ray diffraction of anhydrous and hydrated N-palmitoylgalactosylsphingosine (NPGS) show evidence of complex polymorphic behavior and interconversions between stable and metastable structural forms. Anhydrous NPGS exhibits three lamellar crystal forms (A, B, and B') at temperatures below 143 degrees C and a liquid-crystal form between 143 and 180 degrees C ...

In this work, we model thin films of β-Ca(BH4)2 to understand how nanostructuration the material can be an effective way decrease dehydrogenation enthalpy. Two different crystallographic faces Ca(BH4)2 have been investigated (i.e., (001) and (101)), two reaction pathways considered that release hydrogen through formation CaH2 CaB6, respectively. Quantum mechanical calculations predict size redu...

The enthalpy of hydrogen-bond formation between guanine (G) and cytusine (C) in o-dichlorobenzene and in chloroform at 25°C has been determined by direct calorimetric measurement. We derivatized 2’-deoxyguanosine and 2‘-deoxycytidine at the 5’and 3’-hydroxyls with triisopropylsilyl groups; these group increase the solubility of the nucleic acid bases in nonaqueous solvents. Such derivatization ...

A new approach to the simultaneous measurement of hydrogen evolution reaction (HER) and elemental dissolution rates is presented applied galvanized steel coatings with HCl solution. Dissolution profiles revealed several kinetic regimes including intact coating, nanometric Fe2Al5 intermetallic layer, corrosion substrate. The HER Zn were in excellent agreement, quantities interfacial Fe Al consis...

We report the generation of a plasma of hydrogen and certain alkali ions as recorded via EUV spectroscopy and the hydrogen Balmer and alkali line emissions in the visible range. Typically a hydrogen plasma is generated and the emission of extreme ultraviolet light from hydrogen gas is achieved via a discharge at high voltage, a high power inductively coupled plasma, or a plasma created and heat...

Artemisinin (ARMN) is a potent antimalarial drug, which is effective against multidrug resistant strains of Plasmodium falciparum and produces rapid recovery even in patients with cerebral malaria. Being poorly soluble in water, artemisinin is incompletely absorbed after oral intake due to poor dissolution characteristics in the intestinal fluids. To enhance these properties, solid dispersions ...