Mitotic chromosomes were one of the first cell biological structures to be described, yet their molecular architecture remains poorly understood. We have devised a simple biophysical model of a 300 kb-long nucleosome chain, the size of a budding yeast chromosome, constrained by interactions between binding sites of the chromosomal condensin complex, a key component of interphase and mitotic chr...

Chromosome large-scale organization is a beautiful example of the interplay between physics and biology. DNA molecules are polymers and thus belong to the class of molecules for which physicists have developed models and formulated testable hypotheses to understand their arrangement and dynamic properties in solution, based on the principles of polymer physics. Biologists documented and discove...

the anopheles stephensi mysorensis originating from kazeroon area south of iran, which had been maintained at the laboratory conditions of at 70% relative humidity for almost 150 generations, were subjected to cytogenetical analyses. the ‘instant’ landmarks in the squash preparations of the salivary gland chromosomes are indicative of cytotaxonomic characteristics of the species. the characteri...

The subfamily Bambusoideae comprises three monophyletic tribes, Arundinarieae, Bambuseae and Olyreae. Here we report the gametic number chromosomal meiotic behavior of two species belonging to herbaceous tribe Olyreae, Olyra latifolia humilis. Accessions were collected in Misiones, at Northeastern Argentina. We a new for O. humilis, n=18, confirmed n=11 latifolia. Chromosomal features, like bas...

Chromosomal patterns of experimental animals are useful tools for cytogenetics research and animal breeding. Chromosome investigations of the hairless guinea pig are rare, therefore, karyotype of hairless guinea pigs (twelve male and female) was studied using metaphase spreads of bone marrows and G banding techniques. The chromosomes diploid number was 2n= 64 and polymorphism of three type chro...

In the process of proving some goal . . .Hi : Ti . . . ` C, we often need to invert an hypothesis Hi. More precisely, if its type Ti is an instance I(a) of an inductive type family I(x), we want to select the only possible constructors for I(a) and to get the corresponding components. Common instances of this situation occur when reasoning on language operational semantics given in small-step o...

By means of 1 M NaCl isolated lymphocyte chromosomes can be separated into two fractions, each of which contains nucleoprotein. The fraction soluble in M NaCl consists largely of desoxyribose nucleohistone, and constitutes 90 to 92 per cent of the mass of the chromosome. The insoluble residue (the residual chromosome is a coiled thread containing some 12 to 14 per cent of ribose nucleic and abo...

A meiotic chromosome number of n=9 is reported for Eliea articulata, a monospecific genus Hypericaceae endemic to Madagascar. This first report the new small tribe Cratoxlyeae which includes only one other genus, Cratoxylum. hypothetical scenario origin provided in context known numbers Cratoxylum and two tribes Hypericaceae. Given that x=12 has been proposed as basic family with n=11 n=10 also...

pericentric inversions of chromosome 9 are among the most frequent chromosomal rearrangement in human. a few cytogeneticists consider inversions of chromosome 9 as a normal variant. however, many reports in the recent literature link pericentric inversions of chromosome 9 with infertility, recurrent abortions, and a number of other abnormal conditions. we report a case of homozygosity pericentr...

The genus Vicia L. is an important forage crop and consists of approximately 160 annual perennial species. This has variety in phenotypic characters. In this study, six genotypes taxon was choosen to determine the chromosome numbers, ploidy levels compare karyotypic trairts. Based on results, basic number varied from x=5, x=6 x=7. According Stebbins classification, species were classified as sy...