1,720,981 research outputs found
Governo e riqualificazione del territorio: gli strumenti giuridici
Full text linkThe present search analyzes the juridical tools of the urbanistic and environmental retraining in relationship with the government of the territory in a double perspective: both as one of the more remarkable objective circles of the subject "government of the territory", that what archetype of a new formality of his exercise, through that that she has been defined "governance of the territory", expression with which that juridical institutes can be identified that they seek more the integration and the coordination procedures, functions and competences, among public and private subjects, that are interested in the management of the territory to different level, for the realization of an unitary result
Risultati di una prova di intensificazione foraggera su terreni marginali della collina sarda
Full text linkIn the years 1976-78 a fodder-intensification program
was carried out granitic soils of Central Sardinia
where natural resources allow a stocking of 20
kg/ha live weight.Are experirnental area fiften hectars large was chosen
in a farm about 150 ha large, and the following
practices were carried out: scrub clearing, fertilizing,
sward thickening and, in the best soils, sowine of
annual forage crops.In 1978 a stockiing of 100 eurs was obtanied in
the 15 hectars, thank to the improsed fodder availability.In this way, by intervening only on the 10% of
total farm area the livestock could graze continnously
on the pastures while, previously, it could graze on1y
seasonally.Nel triennio 1976-78 è stata condotta una esperienza
di intensificazione foraggera su terreni granitici
della Sardegna centrale. La situazione di partenza
consentiva un carico di circa 20 kg/ha di peso vivo.Nell'ambito dell'azienda si sono identificati 15 ha
sui quali sono state effettuate operazioni di decespugliarnento,
concimazione, infittimento della cotica e,
nei terreni migliori, l'impianto di erbai autunno-vernini.Nel 1978 con le disponibilità foraggere dei 15 ha
migliorati è stato possibile mantenere un carico di 100
pecore da latte, durante tutto il periodo produttivo.Con l'intervento su una superficie pari al 10%
dell'azienda si è quindi resa possibile la presenza stanziale
del bestiame che in precedenza, solo stagionalmente
poteva utilizzare questi pascoli
Popolamento planariologico dei fiumi del nord Sardegna: 1. I cariotipi delle planarie d'acqua dolce del gruppoDugesia gonocephala(Tubellaria, Tricladida) presenti nel fiume Silis (Sassari)
Full text linkKaryological investigations were carried out on tail regenerative blastemata of 104 (95 sexual and 9 fissiparous) out of 270 freshwater planarians belonging to theDugesia gonocephalagroup collected at five different sites along the Silis river (North Sardinia).
The results revealed that the SilisDugesia gonocephalas.l. is made up of different karyotypes: (1) diploid karyotype with 14 chromosomes identified asDugesia hepta; (2) diploid karyotype with 16 chromosomes and (3) triploid karyotype with 24 chromosomes, both attributable respectively to the amphimittic diploid and gynogenetic triplo-exaploid biotypes ofDugesia
benazziiLepori; (4) karyotype with 22 chromosomes; (5) karyotype with 32 chromosomes and (6) karyotype with 27 + B chromosomes of fissiparous individuals. The basic haploid set from which the last three types could have derived could not be determined since, although the chromosome number of sets was essentially constant, the composition varied considerably not only between individuals but al so within the same individual
Prime osservazioni sugli aspetti produttivi e gestionali di alcune aziende zootecniche della VIII Comunità montana
Full text linkL'obiettivo principale di questa ricerca è quello di seguire durante il corso dell'anno e per anni successivi allevamenti rappresentativi (ovini, bovini, caprini e misti con ovini e bovini) al fine di evidenziarne gli aspetti caratteristici e mettere in luce gli elementi negativi che ne ostacolano lo sviluppo
Primi dati sulla distribuzione geografica di planarie del gruppoDugesia lugubris-polychroa(Turbellaria, Tricladida) in Sardegna, con particolare riguardo alla presenza di una mutazione tetraploide nel fiume Cixerri (Siliqua, Cagliari)
Full text linkThe finding of a Planarian of theDugesia lugubris-polychroagroup characterized by a tetraploid chromosome set of 4n=16; n=4 is reported. This is therefore a tetraploid mutation that has never been reported before in Sardinia.Besides mitotic metaphase plates with 16 chromosomes, which are by far the most frequent (78% of the counts), others containing fewer chromosomes, believed to be derived from segregational mitoses, were also observed
Popolamento planariologico dei fiumi del nord Sardegna: 2. I cariotipi dei tridadi d'acqua dolce rinvenuti nel bacino idrografico del fiume Coghinas
Full text linkKaryological and karyometric analyses were carried out on freshwater Triclad populations collected in 19 sites of the Coghinas catchment basin (North Sardinia), in order to identify the existing karyotypes and to establish their distribution. By samples collected 25 strains of thegonocephalagroup and 9 of thelugubris-polychroagroup were obtained, on the basis of morphological and reproductive (sexual/fissiparous) caracteristics of the specimens. Within thegonocephalagroup 177 specimens (168 sexual and 9 fissiparous) were examined and 4 karyotypes
were found as follow: l) diploid karyotype with 2n=2x= 14 belonging toDugesia heptaspecies; 2) diploid 2n=2x=16, triploid 2n=3x=24 and aneuploid 2n=?x=32 karyotypes belonging toDugesia benazziispecies. The karyotype with 32 chromosomes, typical of both fissiparous and sexual specimens, is difficult to interpretate owing to the variations in chromosome morphology.
All the karyotypes resulted variously coexisting and distributed.
Within thelugubris-polychroagroup 71 specimens were
examined; 2 karyotypes were identified both diploid with
2n=2x=8 respectively belonging toDugesia mediterraneaandDugesia polychroaspecies
Descrizione di una nuova razza morfologica diDugesia (Schmidtea) polychroa (Turbellaria, Tricladida)della Sardegna
Full text linkA planarian of theDugesia lugubris-polychroagroup, characterized by triangular head, is reported from Sardinia. The apical position of the eyes is similar to the one found inDugesia (Schmidtea) polychroa. The chromosome set, even if with slight differences, is related to the aforesaid species. Histologieal examination demonstrated its copulatory system to be different, in any detail, from those of the three species oflugubris polychroagroup. The Authors believe that, on the basis of the peeuliarity of both the morphological characters and the chromosome set, the above planarian is to be temporarily considered as a new race of theDugesia (Schimidtea) polychroaspecies.
The denomination they suggest isDugesia (Schmidtea) polychroa macroauriculata
Sulla presenza diCrenobia alpina(Dana) (Turbellaria, Tricladida) in Sardegna
No full textThe presence of the stenothermic cold-water planarianCrenobia alpina(Dana) has been evidenced in Sardinia for the first time. Identification of
the freshwater species was made on the basis of its physio1ogical and morpho-anatomical characteristics.Furthermore the cytological data demonstrated that this population
presents a polyploid karyotype with a marked tendency to aneuploidy.The specimens were collected from three sites in the Gennargentu mountains as well as from a fourth at «Funtana Bona» near Orgosolo.The finding of Crenobia alpina in Sardinia shows that the distribution of this species extends further south within the Mediterranean area than previous reports would suggest
Rinvenimento di una Planaria ascrivibile aDugesia etrusca monoadenodactylaLepori (Turbellaria, Tricladida) nell'Isola di Molara (Sardegna)
Full text linkThe Molara planarian belonging to the groupgonocephalashould not be ascribed to theDugesia benazziiof Sardinia and Corsica, but toDugesia etrusca monoadenodactylafound in the province of Grosseto and described by Lepori in 1947.It was established that the Molara planarian belongs to the above-mentioned race by histological examination of the copulatory system as well as on the basis of its chromosome equipment which is of the 2n=16; n=8 type
Dugesia hepta, nuova specie di Planaria di acqua dolce di Sardegna appartenente alla superspecieDugesia gonocephala(Dugès) (Turbellaria, Tricladida)
Full text linkA planarian belonging to the groupDugesia gonocephalas.l. was found in thirteen sites in Sardinia (eleven in the catchment area of the Rio Mannu of Porto Torres and two in that of the Coghinas). It is morphologically related toDugesia benazziiLepori of Sardinia and Corsica but presents a different caryotype:
2n=14; n=7 chromosomes instead of 2n=16; n=8 chromosomes. The latter is considered to be the most common in the
superspeciesDugesia gonocephalaof central European and Mediterranean distribution areas.On the grounds of the genomic differences made evident and
its particular distribution in Sardinia, the authors believe that the planarian in question should be considered a distinet species within the groupDugesia gollocephalas.l. and propose the denominationDugesia heptan. sp
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