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Mechanism and Kinetics Studies on Non-Isothermal Decomposition of Ludwigite in Inert Atmosphere

100%

Fu X. , Chu M. , Gao L. , Liu Z.

Archives of Metallurgy and Materials

2018

tom Vol. 63, iss. 3

1217--1224

Ludwigite is the main available boron-bearing resource in China. In order to enrich the theory system and optimize its utilization processes, this paper study the mechanism and kinetics on non-isothermal decomposition of ludwigite in inert atmosphere by means of thermal analysis. Results show that, the decomposition of serpentine and szajbelyite is the main cause of mass loss in the process. At the end of decomposition, hortonolite and ludwigite are the two main phases in the sample. The average E value of structural water decomposition is 277.97 kJ/mol based on FWO method (277.17 kJ/mol based on KAS method). The results is proved to be accurate and reliable. The mechanism model function of structural water decomposition is confirmed by Satava method and Popescu method. The form of the most probable model function is G(α) = (1 – α)–1– 1 (integral form) and f (α) = (1 – α)2 (differential form), and its mechanism is chemical reaction. This is verified by the criterion based on activation energy of model-free kinetics analysis.

Polymorphism of AA-NAT gene and its relationship with litter size of Jining Grey goat of China

51%

Chu M. , Yan Y. , Wang P. , Guligena , Yang H. , Hao G. , Yu J. , Tang Q. , Feng T. , Cao G. , Huang D. , Di R. , Liu Q. , Li N.

Animal Science Papers and Reports

2013

tom 31

nr 1

The polymorphisms of arylalkylamine-N-acetyltransferase (AA-NAT) gene in high-prolificacy Jining Grey goat, medium-prolificacy Boer goat and low-prolificacy Liaoning Cashmere, Inner Mongolia Cashmere and Angora goats were detected to analyse their relationships with litter size.Primers (P1-P5) were designed to detect the polymorphisms by PCR-SSCP and PCR-RFLP. For P2,AA, AB and BB genotypes were detected. Sequencing revealed one silent mutation (T132C) of AANAT gene in BB in comparison to AA. For P3, CC and CD genotypes were detected and sequencing revealed one mutation (C265T) of AA-NAT gene in CD in comparison to CC, and this mutation resulted in an amino acid change of Arg→Cys (R89C). The Jining Grey does with genotype CD delivered by 0.56 kids (P<0.05) more than those with CC genotype. For P5, EE, EF and FF genotypes were detected and sequencing revealed one mutation (C586T) of AA-NAT gene in FF in comparison to EE. This mutation caused an amino acid change of Arg→Trp (R196W). For both P2 and P5, the differences in litter size among three genotypes were not significant in Jining Grey goats (P>0.05).These results preliminarily indicate that allele D at the C265T locus of AA-NAT gene is a potential marker in genetic improvement of litter size in goats.