منابع مشابه
Ammonium and caesium carbonate peroxosolvates: supramolecular networks formed by hydrogen bonds.
Diammonium carbonate hydrogen peroxide monosolvate, 2NH(4)(+)·CO(3)(2-)·H(2)O(2), (I), and dicaesium carbonate hydrogen peroxide trisolvate, 2Cs(+)·CO(3)(2-)·3H(2)O(2), (II), were crystallized from 98% hydrogen peroxide. In (I), the carbonate anions and peroxide solvent molecules are arranged on twofold axes. The peroxide molecules act as donors in only two hydrogen bonds with carbonate groups,...
متن کاملHalogen Bonds Formed between Substituted Imidazoliums and N Bases of Varying N-Hybridization.
Heterodimers are constructed containing imidazolium and its halogen-substituted derivatives as Lewis acid. N in its sp³, sp² and sp hybridizations is taken as the electron-donating base. The halogen bond is strengthened in the Cl < Br < I order, with the H-bond generally similar in magnitude to the Br-bond. Methyl substitution on the N electron donor enhances the binding energy. Very little per...
متن کاملDisulfide Bonds Reduce the Toxicity of the Amyloid Fibrils Formed by an Extracellular Protein**
The misfolding of proteins into amyloid fibrils constitutes the hallmark of many diseases. Although relatively few physicochemical properties of protein sequences—charge, hydrophobicity, patterns of polar and nonpolar residues, and tendency to form secondary structures—are sufficient to rationalize in general terms their relative propensities to form amyloid fibrils, 3] other properties can als...
متن کاملNominal Bonds, Real Bonds, and Equity∗
We decompose the term structure of expected equity returns into (1) the real short rate, (2) a premium for holding real long-term bonds, or the real duration premium, the excess returns of nominal long-term bonds over real bonds which reflects (3) expected inflation and (4) inflation risk, and (5) a real cashflow risk premium, which is the excess return of equity over nominal bonds. The shape o...
متن کاملBonds broken and formed during the mixed-linkage glucan : xyloglucan endotransglucosylase reaction catalysed by Equisetum hetero-trans-β-glucanase
Mixed-linkage glucan∶xyloglucan endotransglucosylase (MXE) is one of the three activities of the recently characterised hetero-trans-β-glucanase (HTG), which among land plants is known only from Equisetum species. The biochemical details of the MXE reaction were incompletely understood - details that would promote understanding of MXE's role in vivo and enable its full technological exploitatio...
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ژورنال
عنوان ژورنال: Journal of Chemical Education
سال: 2006
ISSN: 0021-9584,1938-1328
DOI: 10.1021/ed083p1737