نتایج جستجو برای: solvent non solvent

تعداد نتایج: 1366712  

Journal: :pharmaceutical and biomedical research 0
vijay sharma department of pharmaceutics, rajiv academy for pharmacy, n.h. #2, delhi – mathura road, p.o. chattikara, mathura, uttar pradesh – 281001, india kamla pathak department of pharmaceutics, pharmacy college saifai, uprims&r, saifai, etawah, uttar pradesh, india

it has been observed that most of the chemical entities have high lipophilicity and poor aqueous solubility, which result in poor bioavailability. in order to improve the bioavailability, the release behavior of such drugs should be improved. although there are numerous techniques to handle solubility related issue, but they are expensive due to involvement of complicated equipments, advanced m...

Journal: :Biophysical chemistry 2004
Yang Su Emilio Gallicchio

The non-polar component of the potential of mean force of dimerization of alanine dipeptide has been calculated in explicit solvent by free energy perturbation. We observe that the calculated PMF is inconsistent with a non-polar hydration free energy model based solely on the solute surface area. The non-linear behavior of the solute-solvent van der Waals energy is primarily responsible for the...

Journal: :Annals of the rheumatic diseases 1994
A M Garcia-Zamalloa E Ojeda C Gonzalez-Beneitez J Goni A Garrido

Journal: :Industrial health 2000
I Morioka N Miyai H Yamamoto K Miyashita

To clarify the combined effects of organic solvents and noise on hearing, the upper limit of hearing was measured in 48 male workers exposed to organic solvents and/or noise in a factory producing plastic buttons. Measuring the organic solvent concentrations in working environments and breathing zone air, and the noise level in workplaces were also done. The readings suggested that most exposur...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه شهید بهشتی - دانشکده علوم 1372

a simple, sensitive and selective method for solvent extraction and spectrophotemetric determination of lanthanum (ii) europium (iii), and cerium (iii) is described , the rare earth metals are extracted into chloroform solution of n-phenylbenzohydroxamic acid (pbha) at ph 9-10 various parameters are studied to optimize the extraction conditions. the molar absorptivity is found to increase from ...

Journal: :Chemical communications 2011
Cancan Huang Hua Bai Chun Li Gaoquan Shi

A graphene oxide/hemoglobin (GO/Hb) composite hydrogel was prepared for catalyzing a peroxidatic reaction in organic solvents with high yields, exceptional activity and stability.

Journal: :Occupational and environmental medicine 1994
D C Glass A Spurgeon I A Calvert J L Clark J M Harrington

This paper describes how exposure to solvents at two large paint making sites was assessed in a study carried out to investigate the possibility of neuropsychological effects resulting from long term exposure to organic solvents. A job exposure matrix was constructed by buildings and year. A detailed plant history was taken and this was used to identify uniform exposure periods during which wor...

Journal: :Archives of toxicology. Supplement. = Archiv fur Toxikologie. Supplement 1992
P G Ganzevles B W de Geus

2004
Sebastián Torres Guillermo R. Castro

Enzymes are highly specific catalysts that typically function in aqueous solvents. However, many enzymes retain their catalytic activities at high concentrations in non-aqueous environments, including neat hydrophilic organic solvents. In fact, enzymes can be used to carry out reactions in organic solvents that are not possible in aqueous systems. Therefore, biocatalysis in homogenous non-aqueo...

2007
HEMANT K KASHYAP RANJIT BISWAS

Recent extension of mean spherical approximation (MSA) for electrolyte solution has been employed to investigate the non-ideality in Born-free energy of solvation of a rigid, mono-positive ion in binary dipolar mixtures of associating (ethanol–water) and non-associating (dimethylsulfoxide– acetonitrile) solvents. In addition to the dipole moments, the solvent size ratio and ion size have been t...

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