Else reaction conditions were also studies, as follows: 50 C, sugar to acid 1:5,pH7.5, initial water activity 0.75 , dosage of lipase 200mg, rotation speed 200r/min, after reaction for 32h, conversion of lauric can reach 69%.
Temperature, molar ratio of sugar to acid, pH, initial water activity, dosage of lipase, molecular sieve and rotation speed were investigated, the optimum conditions as follows: 45 C , sugar to acid 1:3, pH7.5, initial water activity 0.75, dosage of lipase 50mg, 1g molecular sieve, rotation speed 150r/min, after reaction for 32h, conversion of lauric can reach 69%.
The water activity of corbicular pollen, dried corbicular pollen and 1\|,5\|,10\|,15\|,21\|,60\|day bee bread were 0 651、0 208、0 809、0 605、0 602、0 598、0 607、0 600,respectively.
It showed that the optimum conditions were as follows: temperature 45℃, pH7.5, initial water activity 0.75, dosage of molecular sieve 1g, highest conversion of glucose can reach 65%.
It showed that the optimum conditions were as follows: temperature45℃ pH7.5 initial water activity 0.75 dosage of molecular sieve 1g, Highest conversion of glucose can reach 65%.
The mean activity coefficients of HCI and NiCl_2 in the system HCl-NiCl_2-H_2O were calculated by the Mckay-Perring method using the water activities of these solutions systems.
The isopiestic molalities and the water activities have been measured by isopiestic method and the water vapor pressures and the osmotic coefficients have been calculated from the measurements in the ion-strength range from 0 0581 mol·kg -1 to 0 6320 mol·kg -1 at T=298 15 K for the system Li-Mg-Cl-borate-H 2O.
The isopiestic molalities and the water activities were measured at 298.15 K for the LiCl-Li_(2)B_(4)O_(7)-H_(2)O system by isopiestic method,and the vapor pressures and the osmotic coefficients were obtained from the measurements.
用等压法研究了298.15 K下L iC l-L i2B4O7-H2O体系在不同L iB4O7质量摩尔浓度时的等压平衡浓度,水活度;
Water activities calculated by equilibrium metamorphic reaction by which amphiboles would form two pyroxenes are 0.46- 0.62 for the first mineral associatin and 0.11-0.48 for the second.
Based on the thermodynamic calculation of dehydration reaction s, the activity of water in the Archaean granulite complex in the studied region during metamorphic peak is very low (α-H-2O=0.1-0.2).
During the deformation, chemical composition change was very slight between neocrysts of dynamic recrystallization and porphyroclasts of plastic deformation from the same rock forming mineral, which shows that the activity of water was low and the deformation mechanism was mainly dislocation creep.
(2) The granulite facies stage (M 2) is featured by the mineral assembly consisting of Opx + Cpx + Amp + Gt + Q + Ti + Mt at t =837-887? ℃, p =1.03-1.25? GPa.
The optimum reaction condition in cylcohexanone was at pH 6.0, a_w 0.33, a substrate concentration form 0.06 M to 0.1 M, 65 ℃, and above 150 rpm of shaking speeds.
② low in water, with X H 2O ≈0～0 22, which coincides well with activity of H 2O (0 04～0 31) and mole percent of water ( X H 2O ≈0 03～0 22) based on thermodynamic calculation from equilibrium assemblage of peak metamorphism;
This paper argues the inhibition mechanism of the KCl and the strongly inhibitive Polyglycol CXC-1,with the influence study of the potential,activity and oil-water interfacial tension,mainly using the Zeta/sizer3000 colloid granularity/potential instrument,Novasina activity instrument and Texas-500 interfacial tension instrument.
The experimental data on water activity in PEG solutions as influenced by the PEG concentration and its molecular weight were analyzed in terms of the polymer solution theory.
The binding of competitive inhibitor proflavin by the α-chymotrypsin enzyme in water-acetonitrile mixtures over the entire range of thermodynamic water activities was studied.
Based on an analysis of the shape of the concentration dependences, it was demonstrated that the leading factor in controlling the behavior of the enzyme at low water activities is interprotein contacts formed during its drying.
The interplay of these two factors manifests itself through a complex shape of the isotherm of binding of proflavin, with the maximum being positioned in the range of moderate water activities.
Comparing the activity of water in solutions and near the adsorbent surface, it was concluded that the concentration of the substance dissolved in the bound water gradually decreases when approaching an interface.
Experimental and analytical methods which provide the activity of water in paper and in a water based varnish, and the diffusion coefficient of water in this varnish are presented.
Activity coefficient of HCl in qarternary systems of HCl—KCl—NaCl—H_2O and HCl—KCl—LiCl—H_2O were investigated by means of a cell of the type H_2|HCl(μ_1), MCl(μ_2), MCl(μ_3)|AgCl—Ag The total ionic strength μ used in the experiments ranged from 0.1 to 3. Results obtained for both systems contorm to the following linear relation logγ_1=logγ_(1(0))—α_(12)μ_2—α_(13)μ_3 where α_(12) and α_(13) are identical with the data obtained by Harned for cor. responding ternary systems. Hence the activity coefficient of ...
The Turkdogan's rule is a linear concentration rule of the solubility ofcarbon in the molten Fe-alloys, while he Zdanovskii's rule is that of the mixed elec-trolytes at isopiestic condition. Both are linear concentration rules at onstantchemical potential μ_0. In this paper, these two rules are expressed by three different concentration units(mole raction, molality and weight percent) and are extended to the general linearconcentration rules at constant partial molar uantity Ψ_0 applicable to all thermo-dyn...
The effect of the presence of inorganic salts in aqueous phase on solvent extraction of metals by an extractant could be different during extraction with different mechanisms. The salting-out effect of the extraction of W(Ⅵ), MoⅥ),V(Ⅴ) and Cr(Ⅵ) by amines under anion-exchange and solvation mechanisms respectively was studied. During solvation extraction of oxyacids of transition metals by amines, hydrophilic complexes were formed first between them. The formation of these complexes depends greatly on the ac...
水活度
water activity
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