منابع مشابه
Chromosome Reduction in Genetic Algorithms
Genetic Algorithms have been very successful as adaptive search techniques on a wide variety of problems However the GA has di culty with some problems such as those with rugged tness landscapes or those which require non binary genome representations Recent research has focused on new theories models and techniques for improving the performance of GAs on di cult problems Many new ideas have be...
متن کاملThe Fine Structure of Meiotic Chromosome Pairing in the Triploid, Lilium Tigrinum
The elongate tripartite structure of synapsed homologous chromosomes at meiotic prophase was described by Moses (7) and by Fawcett (2) in 1956. A functional interpretation of this synaptinemal complex was put forward by Moses in 1958 (8) and by Coleman and Moses in 1964 (1). They proposed that the complex is "the morphological expression of the specific function of the pairing of homologous chr...
متن کاملChromosome reduction in Eleocharis maculosa (Cyperaceae).
Chromosome numbers in Cyperaceae lower than the typical basic number x = 5 have been described for only three species: Rhynchospora tenuis (n = 2), Fimbristylis umbellaris (n = 3) and Eleocharis subarticulata (n = 3). Eleocharis maculosa is recorded here as the fourth species of Cyperaceae that has a chromosome number lower than 2n = 10, with 2n = 8, 7 and 6. The karyotype differentiation in E....
متن کاملInactive X chromosome-specific reduction in placental DNA methylation
Genome-wide levels of DNA methylation vary between tissues, and compared with other tissues, the placenta has been reported to demonstrate a global decrease in methylation as well as decreased methylation of X-linked promoters. Methylation is one of many features that differentiate the active and inactive X, and it is well established that CpG island promoters on the inactive X are hypermethyla...
متن کاملSoyasaponins and Related Glycosides of Desmodium canadense and Desmodium illinoense
Seed extracts of Desmodium canadense (L.) DC., a native Canadian legume, were examined by HPLC and electrospray ionization mass spectrometry (LC/MS) for the presence of triterpenoid saponins of the oleanene type. An aqueous methanol extract, fractionated by use of a DiaionTM HP-20 macroporous resin, was found to possess soyasaponin III (soyasaponin Bb ́) and the 2,3-dihydro-2,5-dihydroxy-6-methy...
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ژورنال
عنوان ژورنال: Botanical Gazette
سال: 1904
ISSN: 0006-8071
DOI: 10.1086/328512