搜索结果: 1-13 共查到“理学 acid-base”相关记录13条 . 查询时间(0.093 秒)
Evaluation of the Energetics of the Concerted Acid-Base Mechanism in Enzymatic Catalysis:The Case of Ketosteroid Isomerase
Energetics Concerted Acid-Base Mechanism Enzymatic Catalysis Ketosteroid Isomerase
2016/5/25
Structures of enzymes invariably reveal the proximity of acidic and basic residues to reactive sites on the substrate, so it is natural and common to suggest that enzymes employ concerted mechanisms t...
Acid-base properties and structons: towards a structural model for predicting the thermodynamic properties of silicate melts
silicate melt acid-base oxide melt thermodynamic properties
2015/9/10
Phase equilibrium relationships in igneous systems can be estimated using empirical mathematical models based on
multi-component regular solution formulae. Although these provide useable results with...
Acid-base homeostasis of blood and pH of abomasum in calves fed non-acidified and acidified milk replacer
calves milk feeding formic acid acid-base balance pH of abomasums
2015/6/4
Experiments were conducted on calves divided into three groups, 6 animals in each, to determine the influence of the intake of non-acidified and acidified milk replacer on the level of acid-base homeo...
Antioxidants Supplementation on Acid Base Balance during Heat Stress in Goats
Antioxidants Acid Base Status Stress Hormones Heat Stress Goats
2016/5/5
The effects of vitamin C and vitamin E with selenium on acid-base balance and some stress hormones were evaluated during heat stress in goats. Goats, 1.5 years of age, were divided into control, heat ...
pH modelling in aquatic systems with time-variable acid-base dissociation constants applied to the turbid,tidal Scheldt estuary
pH modelling aquatic systems time-variable acid-base dissociation Scheldt estuary
2010/1/20
A new pH modelling approach is presented that explicitly quantifies the influence of biogeochemical processes on proton cycling and pH in an aquatic ecosystem, and which accounts for time variable aci...
Nutrient Intake, Acid Base Status and Growth Performance of Thalli Lambs Fed Varying Level of Dietary Cation-anion Difference
DCAD Thalli Lambs Nitrogen and Calcium Balance Growth
2016/4/26
Influence of -110, +110, +220 and +330 mEq/kg of dry matter (DM) dietary cation-anion difference (DCAD) on growth performance of Thalli lambs were examined in a randomized complete block design. Four ...
Effects of Long-term Heat Exposure on Adaptive Mechanism of Blood Acid-base in Buffalo Calves
Blood Acid-base Fractional Excretion Renal Clearance Long-term Heat Stress Buffalo Calves
2016/4/25
In order to investigate the mechanism of adaptation to long-term heat stress, six female buffalo calves of about 7 to 8 months age, were exposed to the cool-comfort environment (THI 65) for 21 days to...
Acid-Base Equilibria of Some N-Substituted Thiophene-2-Carboxamidoximes in Non-Aqueous MediaAcid-Base Equilibria of Some N-Substituted Thiophene-2-Carboxamidoximes in Non-Aqueous Media
Thiophene protonation constant potentiometry pKa values amidoxime
2010/4/22
The protonation constants of the amino nitrogens of some N-substituted thiophene-2-carboxamidoximes have been determined in acetic acid by means of potentiometric titration with perchloric acid. pKa v...
Hard and Soft Acid-Base Model Applied to Bivalent Cation Selectivity on a 2:1 Clay Mineral
Bivalent Cations Covalent Bonding Electronegativity HSAB Montmorillonite Selectivity Coefficient Softness
2011/12/8
Abstract: We applied the hard and soft acid-base (HSAB) model (Xu and Harsh 1990a, 1990b) to bivalent cation exchange on a purified Ca-montmorillonite. As a result, a satisfactory model is proposed to...
Hydrophobic Nature of Organo-Clays as a Lewis Acid/Base Phenomenon
Organo-clay Surface tension Lewis acid/base
2011/12/31
The surface thermodynamic properties of a series of n-alkylammonium and quaternary ammonium treated clay films were determined by contact angle measurement of drops of test liquids using the Young equ...
Study of Some Physicochemical Properties of Pillared Montmorillonites: Acid-Base Potentiometric Titrations and Electrophoretic Measurements
Electrophoretic mobility Montmorillonite Pillared clays Potentiometric titration Surface charge
2012/1/4
The surface charges and the zeta potential of a Na-montmorillonite (Na-mont) and two pillared montmorillonite (MP1 and MP2) samples with different aluminum contents were determined by potentiometric t...
The Release of Aluminum from Aluminosilicate Minerals. II. Acid-Base Potentiometric Titrations
Aluminum Biotite Buffer Illite Kaolinite Mica Montmorillonite
2012/2/9
Acidified suspensions of Al-saturated kaolinite, montmorillonite, mica, illite, and biotite in 10−3 M NaNO3 were potentiometrically titrated with 0.1 N NaOH and 0.1 N HNO3 in succession in a CO2...
Acid-Base Interactions and the Properties of Kaolinite in Non-Aqueous Media
Acid-Base Interactions Kaolinite Non-Aqueous Media
2012/2/17
In non-aqueous systems, kaolinite can show, in addition to the physical interactions, considerable chemical activity. This study considers the chemical reactions that can occur at the kaolinite surfac...