86 research outputs found
Chromosomal evolution of the house mouse, Mus musculus domesticus, in the Aeolian Archipelago (Sicily, Italy)
No full textWe describe the chromosomal evolution of the metacentric populations of the house mouse, Mus musculus domesticus, which constitute the Robertsonian System of Aeolian Islands (Sicily, Italy). Eighty-nine specimens from all the seven islands that form the Archipelago were cytogenetically examined. The analysis shows the presence of 4 Rb races with a large number of shared metacentric chromosomes: 2n = 36 on Panarea, 2n = 34 on Alicudi, 2n = 26 on Lipari and Stromboli, and a different 2n = 26 race on Vulcano. On Salina and Filicudi, the standard karyotype was found. Polymorphism was only found in a population on Panarea Island and this population shares no metacentrics with the other races. The distribution of metacentrics among the races and the comparison between the Aeolian metacentrics and those found in the 97 previously documented metacentric populations allows us to formulate a hypothesis of chromosomal evolution for the Aeolian Robertsonian system. Six of the twelve metacentric chromosomes found in the Aeolian Islands come from localities outside the archipelago. The evolutionary model highlights how the chromosomal races originated inside the Archipelago and involve several factors, such as formation in situ of metacentrics, zonal raciation and, whole arm reciprocal translocation. (C) 2009 The Linnean Society of London, Biological Journal of the Linnean Society, 2009, 96, 194-202
Genome size evaluations in cockroaches: new entries
No full textIn this paper, we report genome size (GS) values for nine cockroaches (order Blattodea, families Blattidae, Blaberidae and Ectobiidae, ex Blattelidae,), three of which are original additions to the ten already present in the GS database: the death’s head roach (Blaberus craniifer), the Surinam cockroach (Pycnoscelus surinamensis) and the Madeira cockroach (Leucophaea maderae). Regarding the American cockroach (Periplaneta americana), the GS database contains two contrasting values (2.72 vs 3.41 pg); likely, the 2.72 pg value is the correct one as it is strikingly similar to our sperm DNA content evaluation (2.80 ± 0.11 pg). Also, we suggest halving the published GS of the Argentine cockroach Blaptica dubia and the spotted cockroach (the gray cockroach) Nauphoeta cinerea discussing (i) the occurrence of a correlation between increasing 2N chromosome number and GS within the order Blattodea; and (ii) the possible occurrence of a polyploidization phenomenon doubling a basic GS of 0.58 pg of some termite families (superfamily Blattoidea, epifamily Termitoidae)
A LANDMARK IN THE FIELD OF GENOME SIZE EVOLUTION: MARIA GABRIELLA MANFREDI ROMANINI’S CONTRIBUTIONS
No full textMorphometry and chromosomes of Tatera Lataste 1882 (Rodentia, Muridae, Gerbillinae) in West Africa
No full textGeographical pattern of genetic variation in the Robertsonian system of Mus musculus domesticus in central Italy.
No full textZoologia Cesiana nei codici manoscritti dell'Institut de France.
No full textAtti dei Convegni Lincei, 225. Accademia Nazionale dei Lince
Reproductive isolation between chromosomal races of Mus musculus domesticus revealed by multiple unlinked loci
No full text
"A New Technique for Reconstructions of Large Metadiaphiseal Bone Defects"
No full textTumors involving the metadiaphyseal region around the knee are often treated by intraarticular resection (and reconstructed by prosthesis or osteoarticular allografts) even when the subchondral bone could be saved and an intercalary reconstruction applied. This is due to problems associated with the reconstruction of the subarticular diaphyseal bone defects by conventional methods.
Intercalary allografts (as well as cortical autografts) have significant complication rates in terms of delayed union or graft fracture: these would be significantly increased in those patients in whom an adequate osteosynthesis for support is not feasible.
The use of a vascularized fibula alone is contraindicated because it cannot provide sufficient stability for the epiphysis and is too weak to allow early weight bearing.
The Ilizarov technique (bone transportation) is extremely time consuming and it may be at risk in patients under aggressive chemotherapy (pin tract infection, possible interference with callus formation). Furthermore, the thin subarticular segment requires an additional ring across the joint, causing knee stiffness.
The authors describe a new surgical technique to manage this surgical problem. The basic idea consists to bridge the bone defect using a massive allograft as a peripheral shell supporting a centrally placed micro-vascular fibular autograft. This technique was introduced by the first author in 1988 and preliminary results first described by Capanna et al. in 1989 and in 199
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