117,778 research outputs found
Dynamics of Global and Organizational Self-Esteem at Work
No full textSelf-esteem represents one of the most important workers' resources, and has been studied from two different perspectives conceiving self-esteem (1) as a global (i.e., global self-esteem, GSE), or (2) as a domain-specific construct (i.e., organization-based self-esteem, OBSE). To our knowledge, no study has addressed the dynamic relations between these two different self-esteem expressions and their concurrent value as useful work-related personal resources. In this study, we addressed this issue using six-wave longitudinal data weekly gathered from N = 279 full-time workers. We privileged the analysis of the dynamic relationships between GSE and OBSE at the state level, with a close eye on their different impacts on important organizational outcomes. Results from Random Intercept Cross-Lagged Panel models revealed that GSE and OBSE did not predict each other over time, despite being concurrently closely associated within each wave. The same close relation between GSE and OBSE was observed at a trait level. Importantly, rigorous concurrent predictive models revealed that neither GSE nor OBSE predicted or were predicted by the outcomes considered in the present study (i.e., job satisfaction and work engagement). We deeply discussed the implications of these results for refining our understanding of the value of these important self-esteem expressions at work
Semi-quantitative methodology to assess health and safety risks arising from exposure to electromagnetic fields up to 300 GHz in workplaces according to Italian regulations
No full textThis article is focused on a semi-quantitative methodology to assess and manage the health and safety risks arising from exposure to electromagnetic fields (EMFs) up to 300 GHz in workplaces as well as to identify the priorities of intervention, based on the requirements of European Directive 2013/35/EU and Italian regulations. The study includes a synthetic overview of the effects arising from EMF exposure and the related regulatory framework on protection. Furthermore, an in-depth analysis is carried out on the risk assessment process as well as on the technical and organizational measures for risk mitigation and their adaptation to the specific requirements of workers at particular risk, based on technical standards and best practice guides issued by international and national (Italian) standardization bodies
Validation of the Organizational-Based General Self-Esteem Scale
No full textUsing data from four different samples of full-time employees (N(total) = 2,474), the present study was aimed to introduce and demonstrate the validity and reliability of the Organizational-Based General Self-esteem Scale (OB-GSE) a new six-item self-report scale to measure organizational-based self-esteem (OBSE) at work. Results provided evidence of (1) validity (internal, external, and convergent), (2) reliability, and (3) temporal stability of the OB-GSE scale. All in all, results attested the usefulness and the effectiveness of the OB-GSE scale
Assessment and Management of Risks from Occupational Exposure to Electromagnetic Fields (0 Hz to 300 GHz): A Compass to Keep the Right Course Through European and Italian Regulations
No full textThis paper outlines the specific provisions of Italian legislation regarding workers’ exposure to electromagnetic fields (EMFs) from 0 Hz to 300 GHz compared to the minimum health and safety requirements set in European Directive 2013/35/EU. In particular, the path to be followed to assess and manage occupational exposure to EMFs is outlined in relation to the distinction between ‘professional’ and ‘non-professional’ exposure of workers, as well as to the precautionary limits regarding exposures from power lines (50 Hz) and broadcast and telecommunication fixed systems (100 kHz–300 GHz) established by Italian regulations. The reasons underlying such an approach—mainly relying on the intent to reconcile scientific evidence with risk perception in public opinion—are analysed and discussed with the aim of increasing the knowledge of national regulatory provisions on occupational risk assessment, which may be more stringent than the requirements envisaged by international guidelines and community regulations
Cymadusa filosa Savigny 1816
No full text<i>Cymadusa filosa</i> Savigny, 1816 <p>(Figures 43–46)</p> <p> <i>Cymadusa filosa</i> Savigny, 1816, p. 51, 109, pl. IV, fig. 1a–b, e, i, o, u. Monod, 1971, pp. 176–184, figs 66–78. Krapp-Schickel, 1982, pp. 106–108, figs 71–72, key. Ledoyer, 1982, pp. 130–135, figs 44–46. Ledoyer, 1984, pp. 15–18, figs 5–6. Lyons and Myers, 1990, p. 1203, figs 7–8. Ren, 2001, pp. 67–68. Peart, 2004, pp. 304–310, figs 1–4. Appadoo and Steele, 1998, p. 639. Appadoo and Myers, 2004, pp. 343–344. Ren, 2006, pp. 220–222, fig. 83. Lowry, 2007, p. 282 (checklist).</p> <p> <i>Ampithoe filosa</i> Audouin, 1826: pt 4: 93, pl. XI, fig. 4, 5.</p> <p> <i>Grubia hirsuta</i> Chevreux, 1900, pp. 95–101, figs 1–5. Chevreux and Fage, 1925, pp. 339–340, fig. 347. Schellenberg, 1925, pp. 186–187.</p> <p> <i>Grubia coei</i> Kunkel, 1910, p. 97, fig. 38.</p> <p> <i>Grubia filosa</i> Ruffo, 1938, p. 147. Ruffo, 1947, p. 169 –173, figs 1–3. Ruffo, 1959, p. 19. Ruffo, 1969, pp. 62–63. Oliveira, 1953, pp. 358–364, figs 22–23.</p> <p> <i>Grubia sardenta</i> Oliveira, 1953, p. 365, pls 25–26.</p> <p> <i>Cymadusa sardenta</i> Sivaprakasam, 1970, pp. 153–156, fig. 13.</p> <i>Type locality</i> <p>Sardinia, Mediterranean Sea.</p> <i>Material examined</i> <p> New Caledonia: Male, 11 mm, dissected, three slides, AM P.84496, Grand Recif Mbere (22 ◦ 19.90 ′ S, 166 ◦ 13.24 ′ E), 27 m, red alga <i>Asparagopsis taxiformis</i>, 22 November 1995, coll. J.K. Lowry, (NCL-199); female, 14 mm, dissected, one slide, AM P.84497, Grand Recif Mbere (22 ◦ 19.90 ′ S, 166 ◦ 13.24 ′ E), 27 m, red alga <i>Asparagopsis taxiformis</i>, 22 November 1995, coll. J.K. Lowry, (NCL-199); few specimens, AM P.84498, Grand Recif Mbere (22 ◦ 19 ′ 54 ′′ S, 166 ◦ 13 ′ 14 ′′ E), 27 m, red alga <i>Asparagopsis taxiformis</i>, 22 November 1995, coll. J.K. Lowry (NCL-199); several specimens, AM P.84499, Recif Goro (22 ◦ 19 ′ 14 ′′ S, 166 ◦ 23 ′ 18 ′′ E), 1.0 m, coral rubble, 5 November 1995, coll. A.A. Myers (NCL-22).</p> <i>Remarks</i> <p> <i>Cymadusa filosa</i> Savigny, 1816 was redescribed by Peart (2004). Material examined here supports earlier records of <i>C. filosa</i> from New Caledonia by Ledoyer (1984).</p> <i>Habitat</i> <p> New Caledonia material collected from red alga <i>Asparagopsis taxiformis</i>.</p> <i>Distribution</i> <p>Sardinia (Savigny 1816); Madagascar (Ledoyer 1982); Red Sea (Lyons and Myers 1990); India (Sivaprakasam 1970); Mauritius (Appadoo and Myers 2004); South China Sea (Ren 2001); New Caledonia (Ledoyer 1984); Bermuda (Kunkel 1910).</p>Published as part of <i>Peart, R. A. & Hughes, L. E., 2013, Ampithoid amphipods from the South Pacific: Papua New Guinea, French Polynesia and New Caledonia, pp. 739-861 in Journal of Natural History (J. Nat. Hist.) (J. Nat. Hist.) 48 (13 - 14)</i> on pages 796-801, DOI: 10.1080/00222933.2013.825027, <a href="http://zenodo.org/record/5198865">http://zenodo.org/record/5198865</a>
Spazi Mostruosi: per un'architettura trans-specie
No full textL’ architettura, come sapere teorico/ pratico, ha partecipato alla costruzione di processi di inclusione/esclusione all’interno delle città dell’animale non- umano.
Tale processo ha avuto un effetto significativo sulle politiche identitarie connesse all’umano in quanto l’uomo è divenuto il soggetto attraverso il quale si misura il valore di ogni altra forma di esistenza nel mondo.
Lo sguardo razionale e scientifico dell’uomo ha dunque plasmato la città a sua immagine e somiglianza sopprimendo il valore di tutte le altre forme di vita.
Questo lavoro analizza alcuni processi di de-soggettivazione dell’animale al fine di sviluppare una contro-teoria teratologica dello spazio urbano e architettonico, capace di ri-tessere le spaccature e le lacerazioni fabbricate dal paradigma vitruviano.
A tale prospettiva associo una contro- pratica che sia capace di decolonizzare l’architettura attraverso un’attenta analisi delle micro-politiche che alcuni architetti, designer e artisti hanno adottato al fine di instaurare parentele con l’animale non-umano.
Per riabilitare i tessuti connettivi tra umano e non-umano e per ridisegnare a tal scopo la pratica architettonica occorre quindi accingersi a ragionare secondo una struttura reticolare, intrisa cioè di concatenazioni simpoietiche
Apostasy and selection for crypsis in the marine snail Littoraria filosa
No full textThe marine snail, Littoraria filosa, is polymorphic for shell colour, with yellow, brown and pink morphs that correspond in both appearance and frequency to the predominant background colours of its habitat. Previous research on this polymorphism has found indirect evidence of apostatic selection and selection for crypsis by unknown agents, probably crabs, and direct evidence of selection for crypsis by the parasitoid fly Sarcophaga megafilosia. Here we report on field experiments to investigate whether (a) S. megafilosia and (b) shell crushing predators, exert apostatic selection on L. filosa. For S. megafilosia seven experimental treatments containing yellow and brown snails in the proportions of 0.1, 0.2, 0.4, 0.5, 0.6, 0.8 and 0.9 of each colour were established on mangrove trees and used to separately quantify the proportions of each colour attacked on grey/brown trunks and yellow/green leaves. Results confirmed an earlier finding of selection for crypsis, but only showed slight, but significant, anti-apostatic selection by S. megafilosia. For shell crushing predators, seven experimental treatments containing yellow and brown snails in the proportions of 0.08, 0.17, 0.33, 0.50, 0.66, 0.83 and 0.92 were established on two types of trees that differed in their background proportions of brown and green: (a) trees which had been pruned of about 90% of their foliage and (b) unpruned trees. Results showed both selection for crypsis and apostatic selection. Furthermore, a selectively neutral frequency for yellow L. filosa was found for each background, and was less on pruned trees than unpruned ones (and vice versa for brown L. filosa), which can therefore account for the maintenance of a colour polymorphism where the proportions of each morph tend to resemble and correspond in frequency to the colours of the background
Intra-specific host preference for Littoraria filosa by the dipteran parasitoid Sarcophaga megafilosia : the consequences of attacking individuals outside the preferred size range
No full textAbstract. 1. The marine snail, Littoraria filosa, lives on the leaves and trunks of mangroves. Populations of L. filosa are annual when its dipteran parasitoid Sarcophaga megafilosia is present, but perennial in its absence.2. The size distribution of naturally occurring parasitised L. filosa suggests S. megafilosia has a distinct preference for snails with shells ≥10 mm long but, paradoxically, most individuals ≥18 mm long disappear from annual populations in late spring/early summer without appearing in the parasitised cohort. 3. When S. megafilosia was offered an unrestricted size range of L. filosa, only individuals >10 mm long were attacked and those from 19 to 20 mm long were preferred.4. In no-choice experiments, L. filosa 23 mm long, most attacked snails succeeded in ejecting the parasitoid larva but often lost their grip on the wall or ceiling of the cage and fell. Littoraria filosa is unlikely to survive such dislodgement from mangrove trees. 5. These results can explain the different size distributions of live and parasitised snails in the field, including the disappearance of large snails that do not subsequently appear in the parasitised cohort. However, this does not explain the preference by S. megafilosia for L. filosa around 19–20 mm for which more than 50% of attacks failed. This preference may be also determined by increased parasitoid fecundity and longevity as snail size increases. 6. If small differences in host size affect parasitoid fitness, it may help explain why attempts at biological control using known parasitoids of an exotic species are often ineffective or unsuccessful
- …
