نتایج جستجو برای: release kinetics

تعداد نتایج: 305191  

Balamurugan Jeganathan, Vijayalakshmi Prakya

     The aim of this study is to prepare novel sorbitol based extended release tablets by melt dispersion method using carbamazepine as a model drug. Carbamazepine was melted along with sugar alcohol to get melt dispersion granules (MGDs) and was characterized by differential scanning calorimetry (DSC), powder X-ray diffractometry (XRD) and solubility study. The physical and chemical parameters...

Journal: :تحقیقات آب و خاک ایران 0
سمیرا نوروزی کارشناس ارشد دانشگاه صنعتی اصفهان حسین خادمی استاد، دانشگاه صنعتی اصفهان lمهران شیروانی استادیار، دانشگاه صنعتی اصفهان

the release rate of potassium (k) from micaceous minerals plays a significant role in supplying k to plants. the objective of this study was to determine the most appropriate kinetic equation to describe potassium release from micaceous minerals as influenced by organic acids. muscovite and phlogopite were made to react with 0, 500, 2000 and 4000 ?m solutions of oxalic, citric and malic acids f...

Journal: :تحقیقات آب و خاک ایران 0
حمیدرضا متقیان دانشجوی دکتری خاک شناسی، دانشگاه شهرکرد علیرضا حسین پور استاد گروه خاک شناسی دانشکدة کشاورزی دانشگاه شهرکرد

abstract rhizosphere is a small zone with chemical, physical, and biological properties different from those of the bulk soil. information regarding the kinetics of cu release in the rhizosphere soil is scant. throughout this research, kinetics of cu release was investigated in wheat crop rhizosphere vs. non-rhizosphere in 10 calcareous soils by use of rhizobox and in greenhouse conditions. ext...

Journal: :iranian journal of chemistry and chemical engineering (ijcce) 2010
ali pourjavadi rouhollah soleyman ghasem rezanejad bardajee

a hydrophilic macromolecular network is prepared by performing graft copolymerization of poly (sodium acrylate) chains onto salep and silica gel. the reaction parameters affecting the water absorbency of the superabsorbent composite were optimized using taguchi method. ft-ir spectroscopy and thermo gravimetric analysis (tga) were used for confirming the structure of the final product and morpho...

Thymol, an important and advantageous component of many essential oils, has been applied as an antimicrobial agent in animals. To increase the duration of action of this compound in ruminants, it was decided here to prepare a controlled release carrier for thymol. Hydroxy propyl methyl cellulose (HPMC) and ethyl cellulose (EC) were used as the matrix polymer here. Mixtures of thymol with eight ...

Thymol, an important and advantageous component of many essential oils, has been applied as an antimicrobial agent in animals. To increase the duration of action of this compound in ruminants, it was decided here to prepare a controlled release carrier for thymol. Hydroxy propyl methyl cellulose (HPMC) and ethyl cellulose (EC) were used as the matrix polymer here. Mixtures of thymol with eight ...

ژورنال: علوم آب و خاک 2013

Information about potassium (K) release characteristics in the Chaharmahal-va-bakhtiari soils is limited. In this study, K release kinetics of fifteen calcareous soils was investigated. Soil samples were extracted using successive extractions with 0.01 M CaCl2 and citric acid solutions for 2-2017 h at 25±1 0C. Moreover, soil K was determined using 6 chemical extraction methods. The results show...

ژورنال: علوم آب و خاک 2015
ابطحی, سید‌علی , اولیایی, حمیدرضا , باقرنژاد , مجید , شاکری, سیروس , کریمیان , نجفعلی ,

The aim of this study was to assess the kinetics of nonexcheangable potassium release in surface and subsurface soil horizons, using organic and inorganic extractions, in Kohgilouye-va-Boyerahmad Province. Kinetics of K+ release was studied by successive extractions of K from 64 selective surface and subsurface soil samples, using 0.01 M CaCl2 and 0.01 M oxalic acid, for 1948 h, with two replic...

حسین‌پور, علیرضا, متقیان, حمیدرضا,

Rhizosphere is a small zone with different biological and chemical properties from bulk soil. In this research, kinetics of zinc (Zn) release was compared in wheat (Rowshan Back Cross) rhizosphere and bulk soil in 10 calcareous soils by using rhizobox at greenhouse conditions. The rhizosphere and bulk soil samples were extracted with DTPA-TEA for 1 to 504 h at 25±1 0C. In addition, avail...

Ali Pourjavadi, Ghasem Rezanejad Bardajee Rouhollah Soleyman

A hydrophilic macromolecular network is prepared by performing graft copolymerization of poly (sodium acrylate) chains onto salep and silica gel. The reaction parameters affecting the water absorbency of the superabsorbent composite were optimized using Taguchi method. FT-IR spectroscopy and Thermo Gravimetric Analysis (TGA) were used for confirming the s...

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