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polymorphism

The Columbia Encyclopedia, Sixth Edition
polymorphism of minerals, property of crystallizing in two or more distinct forms. Calcium carbonate is dimorphous (two forms), crystallizing as calcite or aragonite. Titanium dioxide is trimorphous; its three forms are brookite, anatase (or octahedrite), and rutile. Polymorphism of an element is called allotropy . The process was discovered (1821) by Eilhard Mitscherlich. See isomorphism ; mineral ; crystal . Author not available, POLYMORPHISM. , The Columbia Encyclopedia, Sixth Edition 2007 ... Read more
polymorphism
A Dictionary of Biology polymorphism The existence of two or more distinctly different ... workers, drones, and queens. This is an environmental polymorphism (see polyphenism ), i.e. the differences are caused ... types of food. There are also heritable or genetic polymorphisms, in which differences are the result of inherited ... Read more
Balanced Polymorphism
Genetics Balanced Polymorphism Balanced polymorphism is a situation in which two different versions of a gene ... be helpful, harmful, or neutral. An example of balanced polymorphism can be illustrated with the set of enzymes in the liver ... Read more

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Genomewide Spatial Correspondence Between Nonsynonymous Divergence and Neutral Polymorphism Reveals Extensive Adaptation in Drosophila
Genetics; 12/1/2007; Macpherson, J Michael; Sella, Guy; Davis, Jerel C; Petrov, Dmitri A; 787 words ; ... heterogeneous reduction in neutral polymorphism throughout the genome. The pattern ... spatial correspondence between neutral polymorphism and nonsynonymous divergence may be ... this correspondence using genomewide polymorphism data from Drosophila simulans and the ... Read more
Correlation between methotrexate efficacy & toxicity with C677T polymorphism of the methylenetetrahydrofolate gene in rheumatoid arthritis patients on folate supplementation
Indian Journal of Medical Research; 11/1/2006; Aggarwal, Parshant; Naik, Sita; Mishra, K P; Aggarwal, Amita; Misra, Ramnath; 787 words ; Background & objectives: C677T polymorphism in the methylenetetrahydrofolate reductase ... relationship between the C677T gene polymorphism and toxicity and efficacy of MTX in ... 63/150) of the patients had C677T polymorphism of which 4 were homozygous (T/T) and ... Read more
Pro12Ala polymorphism of the peroxisome proliferator-activated receptor-[gamma] gene in first-degree relatives of subjects with polycystic ovary syndrome
Gynecological Endocrinology; 10/1/2005; Yilmaz, Murat; Ergün, Mehmet Ali; Karakoç, Ayhan; Yurtçu, Erkan; Et al; 787 words ; ... relationship between the Pro12Ala polymorphism of the peroxisome proliferator-activated ... analysis of the PPAR-γ gene Pro12Ala polymorphism was performed by restriction fragment length polymorphism. Results. Fasting insulin, HOMA-IR ... Read more
Learning about the polymorphism concept
New Straits Times; 1/8/1998; Brandon Xavier; 787 words ; ... for a programming language property, polymorphism is yet another concept in the object-orient ... have to distinguish different types of polymorphism which will be outlined here. The first ... specific time (Figure 1). * Definition Polymorphism (1). The concept of dynamic binding ... Read more
Unique Evolutionary Mechanism in R-Genes Under the Presence/Absence Polymorphism in Arabidopsis thaliana
Genetics; 2/1/2006; Shen, Jingdan; Araki, Hitoshi; Chen, Lingling; Chen, Jian-Qun; Tian, Dacheng; 787 words ; ABSTRACT While the presence/absence polymorphism is commonly observed in disease resistance ... R-genes under the presence/absence polymorphism (R-P/A) have been investigated. To ... R-genes are under presence/absence polymorphism (P/A), which are present in some ecotypes ... Read more
Pro12Ala polymorphism of the peroxisome proliferator-activated receptor-[gamma] gene in women with polycystic ovary syndrome
Gynecological Endocrinology; 6/1/2006; Yilmaz, Murat; Ergün, Mehmet Ali; Karakoç, Ayhan; Yurtçu, Erkan; Et al; 787 words ; ... the relationship between Pro12Ala polymorphism of the peroxisome proliferator ... the restriction fragment length polymorphism technique and polymerase chain reaction to examine Pro12Ala polymorphism in exon 2 of PPAR-γ. Results ... Read more
Trp^sup 64^Arg polymorphism of the [beta]^sub 3^-adrenergic receptor gene, pre-pregnancy obesity and risk of pre-eclampsia
Journal of Maternal - Fetal & Neonatal Medicine; 1/1/2005; Zhang, Cuilin; Williams, Michelle A; Edwards, Karen L; Austin, Melissa A; 787 words ; Abstract Objective: Trp^sup 64^Arg polymorphism of the β^sub 3^-adrenergic receptor ... a puzzling relationship between the polymorphism and the risk of pre-eclampsia. Future ... findings. Keywords: Trp^sup 64^Arg polymorphism, β^sub 3^-adrenergic receptor ... Read more
Single Nucleotide Polymorphisms in the Ovine Casein Genes Detected by Polymerase Chain Reaction-Single Strand Conformation Polymorphism
Journal of Dairy Science; 8/1/2004; Ceriotti, G; Chessa, S; Bolla, P; Budelli, E; Et al; 787 words ; ABSTRACT Casein genetic polymorphisms are important and well known ... PCR)-single-strand conformation polymorphism (SSCP) allows for the simultaneous ... well as the detection of unknown polymorphisms. Here we describe the usefulness ... Read more
DNA Sequence Polymorphism and Divergence at the erect wing and suppressor of sable Loci of Drosophila melanogaster and D. simulans
Genetics; 7/1/2005; Braverman, John M; Lazzaro, Brian P; Aguadé, Montserrat; Langley, Charles H; 787 words ; ... environment) predict a reduction in polymorphism relative to divergence in genomic regions ... Consistent with this prediction, polymorphism is reduced at both loci, while divergence ... events within Africa. The reduction of polymorphism at su(s) combined with the excess of ... Read more
Apolipoprotein B Signal Peptide Polymorphism: Distribution and Influence on Lipid Parameters in Tunisian Population
Physiological Research; 1/1/2007; Kallel, A; Feki, M; Elasmi, M; Souissi, M; Et al; 787 words ; ... LDL, VLDL and chylomicrons. Numerous polymorphisms of the apolipoprotein B gene have been ... Particularly, the insertion/deletion polymorphism located in the coding part of the signal ... assess the effect of insertion/deletion polymorphism of the apolipoprotein B gene on lipid ... Read more

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