196,705 research outputs found
Is the toxic dinoflagellate Ostreopsis cf. ovata harmful to Mediterranean benthic invertebrates? Evidences from ecotoxicological tests with the polychaete Dinophilus gyrociliatus
No full textToxicity tests were performed exposing the polychaete Dinophilus gyrociliatus to seawater samples containing the toxic dinoflagellate Ostreopsis cf. ovata. Experiments were carried out twice in mid summer, when O. cf. ovata bloomed, and twice in late summer, when the dinoflagellate density declined. Each time, four treatments were considered: original sample; reference sample, which always contained 200 O. cf. ovata cells ml-1; filtered-seawater sample; artificial seawater (control). All the time, almost all worms survived in the controls and filtered-seawater treatments. In mid summer, the mortality of worms in the treatments containing O. cf. ovata was high and density-dependent. On the other hand, mortality in groups exposed to the original and reference samples collected in late summer was negligible. The high per cell toxicity of O. cf. ovata during mid summer could represent an allelopathic response. The test with D. gyrociliatus appears to be a promising tool for assessing the ecological risk of toxic dinoflagellate blooms
A. TURBIAU, M. LACHKAR, C. ISLERT, M. BERTHIER, A. ANTOLIN, Écrire à l’encre violette. Littératures lesbiennes en France de 1900 à nos jours, Paris, Le Cavalier Bleu, 2022.
No full textUse of EPS grains to simulate the behavior of MSW in simple shear
No full textThe difficulty in laboratory testing of highly heterogeneous municipal solid waste (MSW) may suggest an investigation of the influence of different stress/strain/drainage conditions, and use of an analogical equivalent medium such as assemblies of expanded polystyrene (EPS) grains, which are characterised by a mechanical response very similar to MSW but relatively simpler for testing preparation. Both materials in fact evidently show a behavioral analogy, such as a different response when subjected to triaxial compression or pure shear, resulting from the effects of significant porosity and a relevant inherent compressibility of the individual elements.
This research is concerned with an experimental investigation into the behaviour of saturated assemblies of EPS grains, tested in the laboratory using a modified simple shear device. In addition to the description of the experimental testing technique, this paper attempts to discuss the main outcome of test results, showing particularly the influence of inherent compressibility of EPS grains on material volumetric response
Recent Advances and Perspectives in Anesthesiology: Towards Artificial Intelligence-Based Applications
No full text: In recent years, the field of anesthesiology has seen remarkable advancements in patient safety, comfort, and outcomes [...]
STATISTICAL IDENTIFICATION OF HOMOGENEOUS SOIL UNITS FOR VENICE LAGOON SOILS
No full textThe paper addresses the identification of soil units which are physically homogeneous in terms of hydro-mechanical response to cone penetration. A moving-window statistical procedure is applied to a number of CPTU-related parameters provided for the Malamocco site in the Venice lagoon. Example criteria for the assessment of homogeneity of soil units are provided. Subjective and objective aspects of the procedure are discussed
Class I BASIC PENTACYSTEINE factors regulate HOMEOBOX genes involved in meristem size maintenance
No full textThe BASIC PENTACYSTEINE (BCP) family is a poorly characterized plant transcription factor family of GAGA BINDING PROTEINS. In Arabidopsis, there are seven members (BPC1-7) that are broadly expressed, and they can potentially bind more than 3000 Arabidopsis GAGA-repeat-containing genes. To date, BPCs are known to be direct regulators of the INNER NO OUTER (INO), SEEDSTICK (STK), and LEAFY COTYLEDON 2 (LEC2) genes. Because of the high functional redundancy, neither single knockout nor double bpc mutant combinations cause aberrant phenotypes. The bpc1-2 bpc2 bpc3 triple mutant shows several pleiotropic developmental defects, including enlargement of the inflorescence meristem and flowers with supernumerary floral organs. Here, we demonstrated through expression analysis and chromatin immunoprecipitation assays that this phenotype is probably due to deregulation of the expression of the SHOOTMERISTEMLESS (STM) and BREVIPEDICELLUS/KNAT1 (BP) genes, which are both direct targets of BPCs. Moreover, we assigned a role to BPCs in the fine regulation of the cytokinin content in the meristem, as both ISOPENTENYLTRANSFERASE 7 (IPT7) and ARABIDOPSIS RESPONSE REGULATOR 7 (ARR7) genes were shown to be overexpressed in the bpc1-2 bpc2 bpc3 triple mutant
Novel Chiral Biheteroaromatic Diphosphine oxides for Lewis base activation of Lewis acids in enantioselective allylation and epoxide opening
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Some results of laboratory tests on lime-stabilized soils for high-speed railways in Italy.
No full textDue to the limited availability of coarse grained soil the use of lime stabilization for the construction
of embankments is being increased in Italy. This system of soil improvement is recently used also in the
realization of new high speed railway embankments, which requires an excellent short and long-term mechanical
performance of the materials supporting the rail lines. The paper presents and discusses some interesting
results of laboratory and field geotechnical tests performed in one Italian site where large high speed railway
embankments are under construction. In particular, the paper deals to the evaluation of the optimal quicklime
content, taking into account basic soil characteristics, economical cost and long-termstatic and cyclic mechanical
behavior
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