1,721,782 research outputs found
Free flaps in head and neck reconstruction in patients affected by vasculitis: To risk or not to risk?
No full textFree-tissue transfer is challenging in patients with vasculitis and autoimmune disorders, but also that it should not be considered as an absolute contraindication.
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Anticoagulant therapy, systemic steroid and antibiotics are fundamental in order to prevent complications more
Obituary: Klaus Hellrigl
Full text linkDr. Klausjörg Hellrigl (1935-2021) passed away few weeks ago. For decades Dr. Hellrigl was a reference for Italian and foreign entomologists. Among his many articles and investigations, Dr. Hellrigl was probably best known for his studies on xylophagous beetles (Coleoptera: Buprestidae and Cerambycidae). Here, two former pupils of Dr. Hellrigl remember his life and scientific works
Complex insect-pathogen interactions in tree pandemics
Full text linkTree pandemics are a major cause of economic and ecological loss in forest and urban ecosystems. They often depend on the introduction of a non-native pathogen, which is occupying the niche of a native, non-aggressive organism. Complex interactions with native insects carrying fungi and nematodes can be established based on the proximity of the aggressive pathogenic agents. Here we review three major pandemics of forest and urban trees in temperate ecosystems at world scale, i.e., the Dutch elm disease, the cypress canker, and the pine wilt disease. For each system, the relationships between aggressive and non-aggressive fungi and nematodes with the native insect vectors are presented. Hidden players such as insects, microorganisms or plants, which may have the role of facilitating or contrasting the performance of the agents, are also considered. Results suggest that pandemics rely on the introduction of a non-native pathogen that exploits well-developed interactions between native non-aggressive organisms and insects associated with trees. The success of the invaders depends on the morpho-physiological proximity of the players and on the mutual benefits resulting from the associations. Deciphering such interactions in native systems may help to predict the outcome of the introduction of new pathogens and the development of new tree pandemics
La chupala : tango argentino para piano / por A. Battisti
No full textTitre uniforme : Battisti, A. (18..-19.. ; compositeur). Compositeur. [La chulapa. Piano]Piano, Musique de -- +* 1900......- 1999......+:20e siècle:Tangos (piano) -- +* 1900......- 1999......+:20e siècle
Bioclimatic Architecture and Urban Morphology. Studies on Intermediate Urban Open Spaces
Full text linkThis paper deals with the interactions between biophysical and microclimatic factors
on the one hand with, on the other, the urban morphology of intermediate urban open spaces,
the relationship between environmental and bioclimatic thermal comfort, and the implementation of
innovative materials and the use of greenery, aimed at the users’ well-being. In particular, the thermal
comfort of the open spaces of the consolidated fabrics of the city of Rome is studied, by carrying
out simulations of cooling strategies relating to two scenarios applied to Piazza Bainsizza. The first
scenario involves the use of cool materials for roofs, cladding surfaces, and pavement, while the
second scenario, in addition to the cool materials employed in the first scenario, also includes the use
of greenery and permeable green surfaces. The research was performed using summer and winter
microclimatic simulations of the CFD (ENVI-met v. 3.1) type, in order to determine the dierent
influences of the materials with cold colors, trees, and vegetated surfaces on the thermal comfort
of the urban morphology itself. Meanwhile, the comfort assessment was determined through the
physiological equivalent temperature (PET) calculated with the RayMan program. The first scenario,
with the use of cool materials, improves summer conditions and reduces the urban heat island
eect but does not eliminate thermal discomfort due to the lack of shaded surfaces and vegetation.
The second scenario, where material renovations is matched with vegetation improvements, has a
slightly bad eect on winter conditions but drastically ameliorates the summer situation, both for
direct users and, thanks to the strong reduction of the urban heat island eect, to urban inhabitants as
a whole
A cautionary lesson from Gaia systematics: the mono-metallic globular cluster NGC 5904
Full text linkThe study of the chemistry of the stellar populations in globular clusters (GCs) is a fundamental task to unveil their formation in the high-redshift universe and to reconstruct the build-up of our Galaxy. Using metallicity estimates from BP/RP low-resolution Gaia DR3 spectra, a recent work presented the surprizing detection of two stellar populations with distinct metallicities in the stellar stream of the GC NGC 5904, otherwise considered a mono-metallic system. The presence of these two populations, with [Fe/H] ∼-1.4 and [Fe/H] ∼-2.0 dex, w as tak en as the evidence of a merger origin of the cluster. In this Letter, using the same data set complemented by new robust metallicity estimates, we carry out a detailed analysis of the metallicity distribution of stars belonging both to the cluster and to its stellar stream, explicitly focusing on the subtle effects of data systematics. We demonstrate that the population at [Fe/H] ∼-2.0 dex is a data artefact due to error systematics, affecting especially faint stars. The new higher quality metallicity sample corroborates this finding, and it indicates the presence of only one population of stars with metallicity of [Fe/H] ∼-1.3 dex, in agreement with previous literature studies. We, therefore, conclude that both NGC 5904 and its stellar stream are mono-metallic systems, and emphasize the need of carefully examining systematic effects in large and complex data
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