Influence of dehydration temperature on water vapor adsorption, dissolution behavior and surface property of ampicillin
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Abstract The article deals with the problems retarded to preparing the single crystals of anhydrous sulphates of the iron‐metal group. The article provides a comprehensive review on up to date recent knowledge on the chemical and physical properties of these sulphates and, in addition, it describes some methods of preparing their anhydrous form. Also inform about the experiments of single crystal growth. It exhibits the facility of the solution of this problem, that is still under investigation.
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Very stable dicalcium phosphate(DCP) against NaF was prepared by heat treatment at 200°C with adding Mg compound and condensed phosphate to DCP anhydrous. The crystal form and surface morphology of the improved DCP anhydrous were compared to that of standard DCP anhydrous. These characteristics were the same as those of standard DCP anhydrous. Although our surface modification technology was considered to keep the original characteristics of standard DCP anhydrous, even the crushed sample by an agate mortar showed a sufficient stability against NaF.
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Anhydrous ammonia for field crops: an evaluation of anhydrous ammonia as a nitrogen supply for cotton, corn, rice & wheat , Anhydrous ammonia for field crops: an evaluation of anhydrous ammonia as a nitrogen supply for cotto... , مرکز فناوری اطلاعات و اطلاع رسانی کشاورزی
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Abstract Some important precursors (1,6‐anhydrous‐2‐deoxy‐2‐azido‐ β‐D ‐glucopyranose ( 3) , 1,6‐anhydrous‐2‐deoxy‐2‐ azido‐3,4‐di‐ O ‐benzyl‐ β‐D ‐mannopyranose ( 5 ), 1,6:2,3‐dianhydrous ‐ β‐D ‐glucopyranose ( 6 ), 1,6‐anhydrous‐3‐deoxy‐3‐azido‐ β‐D ‐glucopyranose ( 10 ) and 1,6‐anhydrous‐2,4‐di‐ O ‐benzoyl‐ β‐D ‐glucopyranose ( 11 )) for complex oligosaccharide synthesis were readily prepared from a green starting material 1,6‐anhydrous ‐ β‐D ‐glucopyranose in one or two steps with moderate to high yields. These improved methods established herein will greatly facilitate the assembly of some complex oligosaccharides for the biological study.
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The article deals with the problem of preparing single crystals of anhydrous sulphates of amphoteric metals lead and tin. It gives a comprehensive review on up to date recent knowledge on the chemical and physical properties of these sulphates and, in addition, it describes some methods of preparing their pure anhydrous form. It also informs about the experiments of single crystal growth. It draws attention to several possibilities of the solution of this problem, which is still not satisfactorily solved.
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To compare the effects of different solvents on the determination of water in erythromycin and explain why anhydrous methanol solvent makes the experiment result higher, Karl Fisher method is used to determine the water in erythromycin , with anhydrous methanol as solvent or anhydrous pyridine . And the result is compared with that of Weightlessness method. It turns out that experiment result with anhydrous pyridine as solvent is closer to weightlessness method. So it is better to determine the water in erythromycin with anhydrous pyridine solvent.
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