86,859 research outputs found

    Hydrobia galatoniana Esu & Girotti, 2019, n. sp.

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    Hydrobia (s.l.) galatoniana n. sp. (Figs 2A, B; 3 A-C) urn:lsid:zoobank.org:act: 81 E 086 A 4-0 C 55-447 F-A 379-46 A 52 ADB 8D34 Hydrobia sp. – Esu et al. 1994: 189, pl. 2, fig. 4b. TYPE MATERIAL. — Holotype: MPUR7-3897 (Fig. 3A), H = 4.9 mm, W = 2.3 mm. — Paratypes: MPUR7-3898/2, 4198/1, 4211/90, 4200/40. DERIVATION OF NAME. — Named after the type locality. TYPE HORIZON. — Limy mudstone layers of Galatone Fm at Galatone (Esu et al. 1994; Bossio et al. 1998). TYPE LOCALITY. — Galatone (Lecce, Apulia, Italy) (40°8’27.03”N, 18°03’0.37”E). TYPE AGE. — Chattian (Late Oligocene). DIAGNOSIS. — Small-sized shell, elongately conical, with up to 6 ¼ whorls, moderately convex to slightly flattened in the middle, often providing a faint angulation in the lower part of the whorl. Aperture ovate to quadrangular ovate, adapically rounded to barely angulate. Umbilicate. DESCRIPTION Shell small-sized, solid, elongately conical, more or less turreted, with up to 6 ¼ regularly increasing whorls, moderately convex to slightly flattened in the middle, often providing a faint angulation in the abapical part and a step-like margin adapically, in proximity of the suture. Suture incised, deep. Last whorl high just under two thirds of shell height. Protoconch of c. 480 µm maximum diameter, smooth, consisting of one and a quarter slightly convex whorl (Fig. 2B). Teleoconch glossy, with thin, prosocline to nearly orthocline and rather regularly spaced growth lines gradually appearing after the protoconch. Aperture ovate to quadrangular-ovate, adapically rounded to barely angulate, sometimes slightly thickened inside along the outer lip; peristome simple, continuous, columellar lip smoothly concave, adherent partially to the last whorl, outer lip slightly arched in lateral profile. Sometimes transverse, more or less raised wrinkles, irregularly spaced, occur on the last whorl just before the aperture (Figs 2A; 3 Ac, Bc). Umbilicus open, narrow, and deep. Range dimensions: H = 4.1-5 mm, W = 2.1-2.4 mm, H/W = 1.95-2.08. REMARKS The shell shape of Hydrobia (s.l.) galatoniana n. sp. shows a certain degree of variability, varying from more (Fig. 3B) to less turreted (Fig. 3C), with moderately convex to slightly flattened whorls, and ovate (Fig. 3 Ba) to quadrangularovate aperture (Fig. 3 Aa, Ca). Comparisons of the study material with several members of Hydrobiidae from the literature, and those stored in the rich malacological collection at the Senckenberg Museum of Frankfurt a. M., showed similarity mainly to two species: Hydrobia dubuissonii (Bouillet, 1834) and Hydrobia andreaei O. Boettger in Degrange-Touzin, 1892. Bouillet (1834: captions to pl. 18, fig. 14) gave a good description of H. dubuissonii from the Oligocene of the type locality (Aurillac, France), whilst the accompanying picture is unclear. Lozouet & Maestrati (2012: fig. 183.1-8) supplied good illustrations of French specimens of this species from the Oligocene (Stampian) of the Paris Basin. Hydrobia dubuissonii from Oligocene deposits of France (Aurillac and Paris Basin), and Middle Oligocene (Rupelian) of Vieux-Jone, Belgium, stored at the Senckenberg Museum (SMF 12.1594c, ex coll. O. Semper), differs from H. (s.l.) galatoniana n. sp. in having a conical-pyramidal shape, a more acute spire with more prominent apex, whorls not stepped, narrower, more ovate and adapically more angled aperture, and a narrower umbilicus (cf. Esu & Girotti 2010: pl. 3, fig. 8; Lozouet & Maestrati 2012). Maximum dimensions (H = 4 mm, W = 2 mm) given by Bouillet (1834) for H. dubuissonii from the type-locality are on average smaller than those measured for the Galatone specimens (H = 4.1-5 mm, W = 2.1-2.4 mm). Hydrobia andreaei from Early Miocene localities of France, Cabanac (Pouquet), Aquitanian (SMF 245531/1-245532/1, coll. O. Boettger, ex Degrange-Touzin), Saucats (near Bordeaux), Aquitanian (SMF 245533/9, coll. O. Boettger), Lariey (Saucats), Aquitanian (SMF 245550/2, coll. O. Boettger), and Oligocene (Chattian, Cyrenenmergel) of ṙKolbsheim, Elsass (SMF 245534/24, coll. O. Boettger, ex A. Andreae) (cf. Degrange-Touzin 1892: 181), differs from H. (s.l.) galatoniana n. sp. in having a more cylindrical and elongate shell with more acute apical angle, a shallower suture, the last whorl slightly descending towards the aperture, restricted and provided with a faint ring-like varix close to the outer lip, a narrower and semiovate aperture, columellar margin slightly thickened and more oblique, outer margin well arched, a not deep umbilicus, and on average smaller size (H = 3.75-4.5, W = 1.62-1.75) (cf. Boettger in Degrange- Touzin 1892: pl. 5, figs 1-1c; Lozouet et al. 2001: fig. 9). Hydrobia (s.l.) galatoniana n. sp. is distinct from the coeval Hydrobia dubuissonii hydruntina Esu & Girotti, 2010, from the Upper Oligocene marls of the bauxite quarry at Otranto (Apulia) (Esu & Girotti 2010: pl. 3, figs 1-7), in having a more cylindrical shell, more convex whorls, wider quadrangular-ovate aperture, and on average larger size (holotype of H. dubuissonii hydruntina: H = 3.8 mm, W = 2 mm; mean size: H = 4 mm, W = 2 mm). Quaggiotto & De Angeli (2016: fig. 3.1-3) illustrated some not well-preserved remains of Hydrobia cf. dubuissonii from the Lower Oligocene of Valle del Ponte (Vicenza, northeastern Italy). These specimens are clearly different from H. (s.l.) galatoniana n. sp. for their larger size (H = 7 mm), and more elongate and turreted shell shape.Published as part of Esu, Daniela & Girotti, Odoardo, 2019, Two new oligohaline Hydrobia (s. l.) (Caenogastropoda) from the transitional Upper Oligocene Galatone Fm (Apulia, Southern Italy), pp. 1-9 in Geodiversitas 41 (1) on pages 4-5, DOI: 10.5252/geodiversitas2019v41a1, http://zenodo.org/record/367872

    Absorption and Fixed Points for Semigroups of Quantum Channels

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    In the present work we review and refine some results about fixed points of semigroups of quantum channels. Noncommutative potential theory enables us to show that the set of fixed points of a recurrent semigroup is a W∗ -algebra; aside from the intrinsic interest of this result, it brings an improvement in the study of fixed points by means of absorption operators (a noncommutative generalization of absorption probabilities): under the assumption of absorbing recurrent space (hence allowing non-trivial transient space) we can provide a description of the fixed points set and a probabilistic characterization of when it is a W∗ -algebra in terms of absorption operators. Moreover we are able to exhibit an example of a recurrent semigroup which does not admit a decomposition of the Hilbert space into orthogonal minimal invariant domains (contrarily to the case of classical Markov chains and positive recurrent semigroups of quantum channels)

    Absorption in Invariant Domains for Semigroups of Quantum Channels

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    We introduce a notion of absorption operators in the context of quantum Markov processes. The absorption problem in invariant domains (enclosures) is treated for a quantum Markov evolution on a separable Hilbert space, both in discrete and continuous times: We define a well-behaving set of positive operators which can correspond to classical absorption probabilities, and we study their basic properties, in general, and with respect to accessibility structure of channels, transience and recurrence. In particular, we can prove that no accessibility is allowed between the null and positive recurrent subspaces. In the case, when the positive recurrent subspace is attractive, ergodic theory will allow us to get additional results, in particular about the description of fixed points

    Mechanical behavior of a total chest wall prosthesis with rib-like features

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    The Department of Thoracic Surgery of the National Institute of Cancer in Milan developed a new rib-cage prosthesis which tries to combine flexibility, protection and bio-compatibility. This new replacement concept has been implanted in many patients, showing cheering results in term of reconstructions simplicity, postoperative complications reduction and patients comfort. This paper investigates and discusses in detail the mechanical behavior of the innovative rib cage prosthesis. Mechanical strength and stiffness are numerically evaluated in order to asses its limits and if it is fully compatible with patients ânormalâ life

    Bioluminescent bacteria as bioindicators in environment

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    With the developments in science of the last decades the environmental consciousness has greatly increased. In every place where man has an influence on the environment which is not a naturally occurring one should be surrounded with procedures to lower it’s environment impact. In vivo luminescence is a sensitive indicator of xenobiotic toxicity: if noxious substances are present, the bacterial luminescence decreases proportionally to their concentration. References: Girotti, S., Ferri, E.N., Bolelli, L., Sermasi, G., Fini, F. Applications of bioluminescence in analytical chemistry. In: “Chemiluminescence in Analytical Chemistry”, A.M. Garcia-Campaña, W.R.G. Baeyens, Eds. New York, Marcel Dekker, 247-284, 2001. S.Girotti, L. Bolelli, A.Roda, G.Gentilomi, M.Musiani. “Improved detection of toxic chemicals using bioluminescent bacteria”. Anaytica Chimica Acta, 471, 113-120, 2002

    ETHICAL CHALLENGES Sfide Etiche nell’Impero Romano: valori, personaggi e contesti sociali tra continuità e trasformazione A cura di B. Girotti e V. Neri

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    Nell'epoca contemporanea, si è assistito a una crescente moltiplicazione degli ambiti che richiedono una riflessione etica, accompagnata da una consapevolezza sempre maggiore delle sfide morali ad esse connesse. Nell'antichità, le riflessioni etiche erano principalmente focalizzate sulla valutazione dei comportamenti individuali e delle situazioni concrete, spesso orientandosi verso un approccio di approvazione o disapprovazione. Tuttavia, era già presente una consapevolezza della distanza tra le realtà pratiche e gli ideali etici ottimali, con la necessità di un continuo sforzo per colmare tale gap e progredire. Questa dinamica può essere considerata una vera e propria sfida etica? In questo volume si intende esplorare, senza pretese di esaustività, come le sfide etiche, sia oggi che nel passato, riguardino situazioni e dilemmi legati a decisioni morali e valori. Tali sfide si manifestano in vari contesti, tra cui la medicina, l’ambito professionale, la disuguaglianza, la giustizia sociale e la società in generale. Esse hanno messo (e continuano a mettere) alla prova la nostra comprensione di ciò che è giusto o sbagliato, e come le azioni e le narrazioni possano (e possano ancora) influenzare gli altri e il mondo che ci circonda

    Metamorfosi del lavoro e funzione orientativa della scuola

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    Nel transito dal fordismo al post-fordismo – a muovere dagli anni Settanta del secolo scorso e con una significativa accelerazione a far data dai Novanta – il lavoro è incorso in vari cambiamenti, di contenuto e di contesto. Tra questi, quelle che potremmo definire le “mutazioni genetiche” del capitalismo acquisiscono una peculiare rilevanza, evidenziando la “non necessità” del lavoro al fine del perpetuarsi dell’accumulazione del capitale e, ad un tempo, la pressione biopolitica sul lavoro medesimo, con ricadute, da un lato, sulla deregolamentazione dei diritti e sulla precarietà occupazionale e, dall’altro lato, sulla spinta all’autoalienazione integrale del lavoratore, con tutto ciò che ne consegue ulteriormente su molteplici versanti. A fronte di siffatte criticità, la riflessione pedagogica e l’intervento formativo sono chiamati ad apportare un contributo sostanziale e di ampio raggio, che qui viene circostanziato nell’ambito delle potenzialità educative demandate alla scuola orientativa per eccellenza, ossia la scuola secondaria di I grado, focalizzando innanzitutto l’attenzione sul recupero educativo del lavoro e, di qua, sulla premura di attivare un’opera culturale che, a partire giustappunto dal lavoro, investa pure questioni altre. Ulteriori potenzialità, nondimeno, sono già parzialmente presenti nelle Indicazioni Nazionali di recente emanazione, ma stentano ad affermarsi nella quotidianità della vita scolastica. Il rimando, in tal senso, va al profilo finale dello studente, che dovrebbe essere l’orizzonte dell’agire didattico, alla funzione formativa attribuita alla valutazione e al ruolo chiave attribuito all’esperienza scolastica nell’ottica del lifelong learning e non solo. Si tratta, in sintesi, di (ri-)fondare l’attuale realtà scolastica “media” grazie a diverse nuove alleanze (tra saperi, tra attività, tra persone, tra luoghi, tra prospettive), in vista della partecipazione attiva alla costruzione di una cultura educativa del lavoro e della vita. ABSTRACT This article aims to highlight the educational and guidance contribution that the junior high school could offer in order to promote a culture of work and a culture of collaboration able to counter the utilitarian distortions of the contemporary economic action. The paper initially focuses on the relationship between productive work, financialisation and neoliberal bio-politics of work and then dwells on the educational and cultural role assigned to the junior high school. ULTERIORI INFORMAZIONI: Il presente contributo è stato sottoposto a due "blind referees" in forma anonima. F. d’Aniello è autore dei seguenti paragrafi: Premessa: il lavoro che cambia; Lavoro e finanziarizzazione del capitale; Lavoro ed assoggettamento biopolitico (pp. 596-600). L. Girotti è autore dei seguenti paragrafi: Una sfida non rimandabile; Una questione di cittadinanza (pp. 600-603). Atti del Convegno internazionale S.I.Ped. “L’educazione permanente a partire dalle prime età della vita. Dalla scuola dell’infanzia all’università” – sessione parallela del gruppo di lavoro “Orientamento permanente”. Sede del Convegno: Facoltà di Scienze della Formazione della Libera Università di Bolzano (Bressanone). Data del Convegno: 3-5 Dicembre 2015.This article aims to highlight the educational and guidance contribution that the junior high school could offer in order to promote a culture of work and a culture of collaboration able to counter the utilitarian distortions of the contemporary economic action. The paper initially focuses on the relationship between productive work, financialisation and neoliberal bio-politics of work and then dwells on the educational and cultural role assigned to the junior high school

    La percezione del ruolo materno in madri detenute

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    Nel panorama nazionale ed internazionale non si discute ancora abbastanza della maternità vissuta in carcere, tuttavia largamente diffusa e quindi tema che merita opportuni approfondimenti al fine di promuovere la ricerca di strategie che garantiscano il diritto della donna detenuta ad essere madre e il diritto dei figli a non essere privati di questo legame. Questo studio esplorativo, svolto presso la Casa Circondariale “Dozza” di Bologna, nella sezione femminile, ha avuto come obiettivo quello di indagare le caratteristiche della percezione del ruolo materno in donne detenute che non vivono con il proprio figlio. Attraverso le interviste e l’uso di strumenti standardizzati, si è approfondito il tipo di maternità esperita dalle donne e le difficoltà personali che la lontananza e l’ambiente frappongono alla possibilità di svolgere adeguatamente il proprio ruolo genitoriale. Pur essendo piccolo il campione, le indagini qualitative hanno consentito di evidenziare un quadro di consistente sofferenza, con utilizzo di meccanismi difensivi quali processi di idealizzazione dell’esperienza di maternità e di razionalizzazione. Dans le panorama national et international, on ne discute pas encore assez de la maternité vécue en prison. Toutefois, celle-ci est largement répandue. Partant, il s’agit d’un thème qui mérite d’être approfondi afin de promouvoir la recherche de stratégies qui garantissent le droit de la femme détenue à être mère et le droit des enfants à ne pas être privés de ce lien. Cette étude - réalisée dans le quartier pour femmes de la maison d’arrêt "Dozza" de Bologne - a eu comme objectif d’analyser les caractéristiques de la perception du rôle maternel chez les femmes détenues qui ne vivent pas avec leurs propres enfants. À travers les entretiens et l'usage d'instruments standardisés, nous avons approfondi le type de maternité vécue par ces femmes et les difficultés personnelles que l’éloignement des enfants et le milieu carcéral interposent aux possibilités de développer d’une façon adéquate le rôle parental. Bien que l’échantillon soit limité, ces enquêtes qualitatives ont permis de souligner un cadre de grande souffrance et le recours à des mécanismes de défense tels que l'idéalisation de l'expérience de maternité et de rationalisation. In the national and international background the debate of motherhood in prison is not yet sufficiently explored, however it is a widespread reality that deserves a deep investigation in order to promote the search for strategies that guarantee the right of women prisoners to be mothers and the right of children of not being deprived of this maternal bond. This exploratory study conducted at the District Prison “Dozza" of Bologna, in women's section, aimed at investigating what kind of perception of maternal role is present in women prisoners not living with their own children. Through the use of interviews and appropriate instruments we examined the type of motherhood experienced by incarcerated women and the personal difficulties in expressing the maternal role imposed by the distance and the environment. Although the recruited sample was small, qualitative analysis of the data highlighted a framework of significant pain along with the tendency to use defence mechanisms giving origin to perceptions of maternal idealization and rationalization

    On a Generalized Central Limit Theorem and Large Deviations for Homogeneous Open Quantum Walks

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    We consider homogeneous open quantum walks on a lattice with finite dimensional local Hilbert space and we study in particular the position process of the quantum trajectories of the walk. We prove that the properly rescaled position process asymptotically approaches a mixture of Gaussian measures. We can generalize the existing central limit type results and give more explicit expressions for the involved asymptotic quantities, dropping any additional condition on the walk. We use deformation and spectral techniques, together with reducibility properties of the local channel associated with the open quantum walk. Further, we can provide a large deviation principle in the case of a fast recurrent local channel and at least lower and upper bounds in the general case
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