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Article
Minimal presentations for monoids with the ascending chain condition on principal ideals
We show that the natural way to extend several key results concerning minimal presentations for finitely generated commutative cancellative reduced monoids, is to replace the finitely generated condition by th...
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Article
Retroelements (LINEs and SINEs) in vole genomes: Differential distribution in the constitutive heterochromatin
The chromosomal distribution of mobile genetic elements is scarcely known in Arvicolinae species, but could be of relevance to understand the origin and complex evolution of the sex chromosome heterochromatin....
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Article
Characterization of the satellite DNA Msat-160 from the species Chionomys nivalis (Rodentia, Arvicolinae)
The satellite DNA Msat-160 has been previously characterized in several species of the genus Microtus. Here we present the characterization of Msat-160 from Chionomys nivalis, a species with a very primitive kary...
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Article
Distribution of L1-retroposons on the giant sex chromosomes of Microtus cabrerae (Arvicolidae, Rodentia): functional and evolutionary implications
Long interspersed nuclear elements (L1 or LINE-1) are the most abundant and active retroposons in the mammalian genome. Traditionally, the bulk of L1 sequences have been explained by the ‘selfish DNA’ hypothes...
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Article
Categorical non-abelian cohomology and the Schreier theory of groupoids
By regarding the classical non-abelian cohomology of groups from a 2-dimensional categorical viewpoint, we are led to a non-abelian cohomology of groupoids which continues to satisfy classification, interpreta...
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Article
A Full and Faithful Nerve for 2-Categories
The notion of geometric nerve of a 2-category (Street, J. Pure Appl. Algebra 49 (1987), 283–335) provides a full and faithful functor if regarded as defined on the category of 2-categories and lax 2-functors. Fur...
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Article
A repeat DNA sequence from the Y chromosome in species of the genus Microtus
In most mammals, the Y chromosome is composed of a large amount of constitutive heterochromatin. In some Microtus species, this feature is also extended to the X chromosome, resulting in enlarged (giant) sex chro...
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Article
X chromosome painting in Microtus: Origin and evolution of the giant sex chromosomes
Sex chromosomes in species of the genus Microtus present some characteristic features that make them a very interesting group to study sex chromosome composition and evolution. M. cabrerae and M. agrestis have en...
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Article
Characterization of an EcoRI family of satellite DNA from two species
We have cloned and sequenced a 321bp band of repetitive DNA from Eptesicus fuscus and E. serotinus observed after gel electrophoresis of EcoRI digested genomic DNA in both species. Southern blot analysis of genom...
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Article
Pericentric satellite DNA sequences in Pipistrellus pipistrellus (Vespertilionidae; Chiroptera)
This paper reports the molecular and cytogenetic characteri-zation of a HindIII family of satellite DNA in the bat species Pipistrellus pipistrellus. This satellite is organized in tandem repeats of 418 bp monome...
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Article
Highly repeated DNA sequences in three species of the genus Pteropus (Megachiroptera, Mammalia)
Bat genomes are characterised by an A-T richness and by a small C-value compared with other mammalian groups. It has been suggested that the small C-value is mainly due to the lack of repetitive DNA sequences....
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Article
High sequence identity between the SRY HMG box from humans and insectivores
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Article
Distribution of sister chromatid exchanges in different types of chromatin in the X chromosome ofMicrotus cabrerae
We used the X chromosomes ofMicrotus cabrerae as a model to analyze the distribution of sister chromatid exchanges (SCEs) on different types of chromatin, because of the marked heterogeneity of the heterochromati...
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Chapter and Conference Paper
The cohomology groups of an epimorphism
If p:S→T is a U-split epimorphism in a monadic category ℂ (such as groups or algebras) and ℂ denotes the induced cotriple on ℂ then the cohomology groups H n (p,A) of the epimorphi...
