L-ornithine is a metabolic product of L-arginine and is found in the liver and other tissues after the enzyme arginase in the urea cycle catalyses the reaction.The presence of L-ornithine has an influence on certain b...L-ornithine is a metabolic product of L-arginine and is found in the liver and other tissues after the enzyme arginase in the urea cycle catalyses the reaction.The presence of L-ornithine has an influence on certain biochemical activities such as the proliferation of collagen production and also has an effect on airway responsiveness.Therefore,it has a role to play in the availability of nitric oxide(NO).A brief reactivity study was carried out for various substituents at the α-C atom of this amino acid.Substituents such as chlorine and fluorine affect the reactivity of the entire molecule and may alter the properties of the amino acid.To understand the properties of molecule,a detailed study was done at the density functional theory(DFT) level and compared with ab initio calculations.Fukui functions were invoked to assess reactivity and stability.The descriptive properties were correlated to logP or pKa using available software to help build a model to quantitatively assess properties and reactivity.Results showed a random reactivity pattern upon halogen substitution and this indicates the need to exercise caution during docking and reactivity studies.展开更多
Both morphological characters and PCR-based RAPD approaches were used to determine the genetic diversity and relatedness among nine fig genotypes grown at the northern region of the West-Bank, Palestine. Although we t...Both morphological characters and PCR-based RAPD approaches were used to determine the genetic diversity and relatedness among nine fig genotypes grown at the northern region of the West-Bank, Palestine. Although we tested 28 primers for the RAPD technique, only 9 produced reasonable amplification products. A total of 57 DNA loci were detected in which 70.2% were polymorphic. DNA fragments presented a minimum of 3 and a maximum of 9 polymorphic bands using primers OPT-10 and OPA-18, respectively. Primers exhibited collective resolving power values (Rp) of 18.826. The Mwazi genotype showed the highest genetic distances among all of the other genotypes. Morphologically, considerable variations were found using 41 quantitative and qualitative traits. Adloni could be a very promising genotype for fresh consumption due to its very late maturation period, extended harvesting period, variable fruit size, and easy skin peeling. In addition, 7 genotypes presented firm fruits, which are a very important criterion for exporting purposes. Dendrogram constructed by UPGMA based on RAPD banding patterns appear somewhat contradictory to the morphological descriptors particularly with Swadi and Biadi genotypes (closed genetically and distanced morphologically), which might be attributed to the phenotypic modifications caused by environmental differences across regions. These preliminary results will make a fundamental contribution to further genetic improvement of fig crops for the region.展开更多
We propose a novel Laplacian-based algorithm that simplifies triangle surface meshes and can provide different preservation ratios of geometric features.Our efficient and fast algorithm uses a 3D mesh model as input a...We propose a novel Laplacian-based algorithm that simplifies triangle surface meshes and can provide different preservation ratios of geometric features.Our efficient and fast algorithm uses a 3D mesh model as input and initially detects geometric features by using a Laplacian-based shape descriptor(L-descriptor).The algorithm further performs an optimized clustering approach that combines a Laplacian operator with K-means clustering algorithm to perform vertex classification.Moreover,we introduce a Laplacian weighted cost function based on L-descriptor to perform feature weighting and error statistics comparison,which are further used to change the deletion order of the model elements and preserve the saliency features.Our algorithm can provide different preservation ratios of geometric features and may be extended to handle arbitrary mesh topologies.Our experiments on a variety of 3D surface meshes demonstrate the advantages of our algorithm in terms of improving accuracy and applicability,and preserving saliency geometric features.展开更多
基金supported by the University Grants Commission,India
文摘L-ornithine is a metabolic product of L-arginine and is found in the liver and other tissues after the enzyme arginase in the urea cycle catalyses the reaction.The presence of L-ornithine has an influence on certain biochemical activities such as the proliferation of collagen production and also has an effect on airway responsiveness.Therefore,it has a role to play in the availability of nitric oxide(NO).A brief reactivity study was carried out for various substituents at the α-C atom of this amino acid.Substituents such as chlorine and fluorine affect the reactivity of the entire molecule and may alter the properties of the amino acid.To understand the properties of molecule,a detailed study was done at the density functional theory(DFT) level and compared with ab initio calculations.Fukui functions were invoked to assess reactivity and stability.The descriptive properties were correlated to logP or pKa using available software to help build a model to quantitatively assess properties and reactivity.Results showed a random reactivity pattern upon halogen substitution and this indicates the need to exercise caution during docking and reactivity studies.
文摘Both morphological characters and PCR-based RAPD approaches were used to determine the genetic diversity and relatedness among nine fig genotypes grown at the northern region of the West-Bank, Palestine. Although we tested 28 primers for the RAPD technique, only 9 produced reasonable amplification products. A total of 57 DNA loci were detected in which 70.2% were polymorphic. DNA fragments presented a minimum of 3 and a maximum of 9 polymorphic bands using primers OPT-10 and OPA-18, respectively. Primers exhibited collective resolving power values (Rp) of 18.826. The Mwazi genotype showed the highest genetic distances among all of the other genotypes. Morphologically, considerable variations were found using 41 quantitative and qualitative traits. Adloni could be a very promising genotype for fresh consumption due to its very late maturation period, extended harvesting period, variable fruit size, and easy skin peeling. In addition, 7 genotypes presented firm fruits, which are a very important criterion for exporting purposes. Dendrogram constructed by UPGMA based on RAPD banding patterns appear somewhat contradictory to the morphological descriptors particularly with Swadi and Biadi genotypes (closed genetically and distanced morphologically), which might be attributed to the phenotypic modifications caused by environmental differences across regions. These preliminary results will make a fundamental contribution to further genetic improvement of fig crops for the region.
基金This work has been financially supported by the National High Technology Research and Development Program of China(863 Program)(www.nsfc.gov.cn,No.2015AA016403)the National Natural Science Foundation of China(www.nsfc.gov.cn,No.61602223).
文摘We propose a novel Laplacian-based algorithm that simplifies triangle surface meshes and can provide different preservation ratios of geometric features.Our efficient and fast algorithm uses a 3D mesh model as input and initially detects geometric features by using a Laplacian-based shape descriptor(L-descriptor).The algorithm further performs an optimized clustering approach that combines a Laplacian operator with K-means clustering algorithm to perform vertex classification.Moreover,we introduce a Laplacian weighted cost function based on L-descriptor to perform feature weighting and error statistics comparison,which are further used to change the deletion order of the model elements and preserve the saliency features.Our algorithm can provide different preservation ratios of geometric features and may be extended to handle arbitrary mesh topologies.Our experiments on a variety of 3D surface meshes demonstrate the advantages of our algorithm in terms of improving accuracy and applicability,and preserving saliency geometric features.
