139,370 research outputs found
Choh and Janssen Funct Ecol 2023
No full textData of Choh and Janssen 2023
A tiny cuckoo: risk-dependent interspecific brood parasitism in a predatory mite. Functional Ecology </p
Choh and Janssen Funct Ecol 2023
No full textData of Choh and Janssen 2023
A tiny cuckoo: risk-dependent interspecific brood parasitism in a predatory mite. Functional Ecology </p
Choh and Janssen Funct Ecol 2023
No full textData of Choh and Janssen 2023
A tiny cuckoo: risk-dependent interspecific brood parasitism in a predatory mite. Functional Ecology </p
Choh and Janssen Funct Ecol 2023
No full textData of Choh and Janssen 2023
A tiny cuckoo: risk-dependent interspecific brood parasitism in a predatory mite. Functional Ecology </p
Choh and Janssen Funct Ecol 2023
No full textData of Choh and Janssen 2023 A tiny cuckoo: risk-dependent interspecific brood parasitism in a predatory mite. Functional Ecolog
Freezing Points Of Aqueous Alcohols: Free Energy Of Interaction Of The CHOH, CH₂, CONH And C[double bond]C Functional Groups In Dilute Aqueous Solutions
No full textThe freezing temperatures of dilute aqueous solutions of methanol, ethanol, 2-propanol, butanol, t-butanol, cyclohexanol and ethylene glycol were measured over the concentration range 0.1 to 1 mol kg–1. Osmotic coefficients at 0°C were calculated. The limiting pairwise interaction coefficients of the alcohols, plus a variety of polyhydroxy compounds and carbohydrates, were calculated at 25°C from the available data and then correlated using the additivity principle of Savage and Wood. This correlation approximates effective free energies of CH2 and CHOH group interactions with themselves and with each other. Literature data were used to estimate interactions between CONH and C[double bond]C groups. The CONH—CONH interaction appears to be large, consistent with a strong stabilizing effect of these on native protein structures. The CH2…CH2 interaction also indicates attractive forces between these groups. The present model for the hydrophobic interaction is most appropriate for small molecular interactions whereas previous treatments are best for situations involving site binding. The CHOH…CHOH and CH2…CONH interactions are small, while the CHOH…CH2 free energy of interaction is positive, due either to volume exclusion or net repulsive forces. The entropy change associated with the CH2…CH2 interaction is large and positive as expected and is not completely compensated by a corresponding enthalpy change. The entropy change associated with the CONH…CONH interaction indicates that few degrees of freedom are involved, which is consistent with the formation of a strong hydrogen bond. The correlation can be used to estimate thermodynamic properties of dilute non-electrolyte solutions and can also predict the effect of solutes on the solubility of solids and gases
On the mechanism of hydrogen transfer in the HSCH(O) reversible arrow (S)CHOH and HSNO reversible arrow SNOH reactions
No full textGutierrrez-Oliva,S. Centro de Bioinformática y Simulación Molecular, Universidad de Talca, Casilla 721, Talca, Chile.The 1,3-intramolecular hydrogen transfer in the HSCH(O) reversible arrow (S)CHOH and HSNO reversible arrow SNOH reactions is studied through density functional theory calculations. The reaction force together with structural and electronic properties is monitored along the reaction path to characterize the mechanism of hydrogen transfer. It is found that in both reactions the hydrogen transfer is activated by the structural rearrangement of the backbone atoms that allow the electrostatic interactions to promote the hydrogen transfer in a stepwise mechanism
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