Experimental demonstration of four-party quantum secret sharing

Secret sharing is a multiparty cryptographic task in which some secret information is splitted into several pieces which are distributed among the participants such that only an authorized set of participants can reconstruct the original secret. Similar to quantum key distribution, in quantum secret sharing, the secrecy of the shared information relies not on computational assumptions, but on laws of quantum physics. Here, we present an experimental demonstration of four-party quantum secret sharing via the resource of four-photon entanglement

Instalacion de un sistema de bitacoras para la pesca atunera de superficie en Venezuela y analisis de los primeros resultados

Dans le cadre des recommandations faites par le SCRS de la C.I.C.T.A. un nouveau système de livres de bord a été mis en place au Vénézuela en avril 1986. L'analyse des premiers résultats montre que les déclarations faites par les canneurs et les senneurs divergent pour les espèces de thon peu abondantes dans les eaux vénézueliennes comme le patudo (#Thunnus obesus) ou le thon noir (#Thunnus atlanticus). La comparaison des déclarations réalisées par un senneur et un canneur sur un même banc confirme l'existence de biais qui affecte également les deux principales espèces qui sont l'albacore (#Thunnus albacares) et le listao (#Katsuwonus pelamis) et en particulier les estimations du poids moyen des individus de ces deux espèces ... L'observation d'oiseaux, accompagnée (95,5 % des cas), ou non (50 %), par d'autres indices est la principale source de détection des bancs de thon

Produtividade de trigo e soja em Latossolo Vermelho distrófico sob erosão simulada e causada pela chuva.

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Resultados preliminares sobre el crecimiento de Thunnus albacares en el mar Caribe

Ce travail présente les premiers résultats d'une étude réalisée, entre septembre 1987 et août 1988, sur la croissance de l'albacore (#Thunnus albacares$) dans le sud de la mer des Caraïbes. Les mesures, réalisées en longueurs prédorsales (LD1), ont été transformées en longueur à la fourche (LF) après établissement de la relation : log10 LF = 0,2948 + 1,1649 (log10 LD1). L'étude de la croissance, faite au moyen de la méthode des progressions modales, démontre, comme dans l'Atlantique Est, une croissance lente entre 50 et 60 cm (environ 1,04 cm/mois), suivie d'une croissance plus rapide (entre 60 et 120 cm) décrite à l'aide de l'équation de Von Bertalanffy : Lt = 177,6611 (1 - exp (- 0,6598 (t - to)). Un échantillonnage plus intensif sur les grands individus est, toutefois, nécessaire pour afiner ces résultats. (Résumé d'auteur

Perceptions of the intergroup structure and anti-Asian prejudice amongst white Australians

Proof oSubjective intergroup beliefs and authoritarianism were assessed in a field study (N= 255) of White Australians’ anti-Asian stereotyping and prejudice. A social identity analysis of intergroup prejudice was adopted, such that perceptions of the intergroup structure (instability, permeability, legitimacy and higher ingroup status) were proposed as predictors of higher prejudice (blatant and covert) and less favorable stereotyping. Consistent with the social identity approach, both independent and interacting roles for sociostructural predictors of Anti-Asian bias were observed, even after demographic and personality variables were controlled. For example, perceived legitimacy was associated with higher prejudice when White Australians’ status position relative to Asian Australians was valued. Moreover, when participants evaluated Whites’ position as unstable and high status or legitimate, perceptions of permeable intergroup boundaries were associated with anti-Asian bias. The present findings demonstrate status protection responses in advantaged group members in a field setting, lending weight to the contention that perceptions of sociostructural threat interact to predict outgroup derogation. Implications for theories of intergroup relations are discussed

Involvement of the G-protein-coupled dopamine/ecdysteroid receptor DopEcR in the behavioral response to sex pheromone in an insect

Most animals including insects rely on olfaction to find their mating partners. In moths, males are attracted by female-produced sex pheromones inducing stereotyped sexual behavior. The behaviorally relevant olfactory information is processed in the primary olfactory centre, the antennal lobe (AL). Evidence is now accumulating that modulation of sex-linked behavioral output occurs through neuronal plasticity via the action of hormones and/or catecholamines. A G-protein-coupled receptor (GPCR) binding to 20-hydroxyecdysone, the main insect steroid hormone, and dopamine, has been identified in Drosophila (DmDopEcR), and was suggested to modulate neuronal signaling. In the male moth Agrotis ipsilon, the behavioral and central nervous responses to pheromone are age-dependent. To further unveil the mechanisms of this olfactory plasticity, we searched for DopEcR and tested its potential role in the behavioral response to sex pheromone in A. ipsilon males. Our results show that A. ipsilon DopEcR (named AipsDopEcR) is predominantly expressed in the nervous system. The corresponding protein was detected immunohistochemically in the ALs and higher brain centers including the mushroom bodies. Moreover, AipsDopEcR expression increased with age. Using a strategy of RNA interference, we also show that silencing of AipsDopEcR inhibited the behavioral response to sex pheromone in wind tunnel experiments. Altogether our results indicate that this GPCR is involved in the expression of sexual behavior in the male moth, probably by modulating the central nervous processing of sex pheromone through the action of one or both of its ligands

Alpha-particle emitting 213Bi-anti-EGFR immunoconjugates eradicate tumor cells independent of oxygenation

Hypoxia is a central problem in tumor treatment because hypoxic cells are less sensitive to chemo- and radiotherapy than normoxic cells. Radioresistance of hypoxic tumor cells is due to reduced sensitivity towards low Linear Energy Transfer (LET) radiation. High LET α-emitters are thought to eradicate tumor cells independent of cellular oxygenation. Therefore, the aim of this study was to demonstrate that the cell-bound α-particle emitting 213Bi immunoconjugates efficiently kill hypoxic just like normoxic CAL33 tumor cells. For that purpose CAL33 cells were incubated with 213Bianti- EGFR-MAb or irradiated with photons with a nominal energy of 6 MeV both under hypoxic and normoxic conditions. Oxygenation of cells was checked via the hypoxia-associated marker HIF-1α. Survival of cells was analysed using the clonogenic assay. Cell viability was monitored with the WST colorimetric assay. Results were evaluated statistically using a t-test and a Generalized Linear Mixed Model (GLMM). Survival and viability of CAL33 cells decreased both after incubation with increasing 213Bi-anti-EGFR-MAb activity concentrations (9.25 kBq/ml – 1.48 MBq/ml) and irradiation with increasing doses of photons (0.5 – 12 Gy). Following photon irradiation survival and viability of normoxic cells were significantly lower than those of hypoxic cells at all doses analysed. In contrast, cell death induced by 213Bianti- EGFR-MAb turned out to be independent of cellular oxygenation. These results demonstrate for the first time that α-particle emitting 213Bi-immunoconjugates eradicate hypoxic tumor cells as effective as normoxic cells. Therefore, 213Biradioimmunotherapy seems to be an appropriate strategy for treatment of hypoxic tumors.JRC.E.5-Nuclear chemistr

On pancultural self-enhancement: well-adjusted Taiwanese self-enhance on personally valued traits

Taiwanese participants made better-than-average judgments on collectivistic and individualistic traits, evaluated the personal importance of those traits, and completed measures of psychological adjustment (depression, perceived stress, subjective well-being, and satisfaction with life). Replicating findings from other East Asian samples, participants self-enhanced (i.e., regarded the self as superior to peers) more on collectivistic than individualistic attributes and assigned higher personal importance to the former than the latter. Moreover, better adjusted participants manifested a stronger tendency to self-enhance on personally important attributes. These data are consistent with the view that self-enhancement is a universal human motive that is expressed tactically and at odds with the assertion that self-enhancement is a uniquely Western phenomenon. <br/