H-Bond


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H-Bond

A former savings bond in the United States that paid interest on its principal semi-annually. Unlike Series E bonds, which paid interest only at redemption, H-bonds provided bondholders with current income on their investments. H-bonds were issued at face value, were exempt from state and local taxes, and had a fixed interest rate. They were issued between 1952 and 1979 and were replaced by the Series HH bond in 1980.
References in periodicals archive ?
As two complementary strands get longer, the additive nature of the H-bond energies comes into play, and at some total number of potential H-bonds between two single DNA strands, their energy surpasses the temperature dependent vibrational energies, and the two strands stick together.
The chemoselectivity of the esterification reaction was attributed to the H-bond withdrawing electrons from the carbonyl, thereby promoting the nucleophilic attack by an OH group.
33 kcal/mol with respective to B and in this case two H-bond were established, the first between O of CO[O.
Fenitrothion has apparent structural similarities with the pharmaceutical antiandrogen flutamide and the environmental antiandrogens vinclozolin and linuron (Figure 2) but differs most significantly in having a thiophosphonyl group as a proposed H-bond acceptor in the D-ring region of the AR interaction site.
The O of the SO2 acted as a H-bond receptor of hydrogen with the residues of the amino acid; Thr 56 in conjunction with Ser 59 (2.
The H-bond effect on the dynamic mechanical properties and crystallization behavior of the nanocomposites were subsequently studied by dynamic mechanical analysis (DMA) and wide-angle X-ray diffraction (XRD), respectively.
On the other hand upon switching to the isomeric structures both the O/H distance and the Y-N1-H bond angle decrease while the N1-H bond length increases which indicates that the absence of the N2/H-N1 H-bond in the isomeric structures causes strengthening of the O/H-N1 H-bond.
Polyurethane-based azopolymers, containing no hydroxyl groups in the main chains and only less accessible NH groups as H-bond donors, were anticipated to have more labile azo groups and hence to exhibit higher SRG efficiency than the epoxy- or aniline-based azopolymers.
The H-bond is one of the essential concepts in science due to its valuable role in chemistry and biology, which makes it one of the enduring active research topics.