342 research outputs found
La genetica di popolazioni fornisce un efficace strumento per quantificare l'impatto della frammentazione in ecosistemi forestali
No full textA simple general method to evaluate intra-specific transpiration parameters within and among seedling families
No full textA method to evaluate the genetic control of
plant response to increasing soil water deficit is proposed.
A description of single tree transpiration
behavior was obtained considering parameters independent
from air and soil conditions. We removed
environmental effects by using two approaches: the
normalization of drought data to control (watered)
plants and the fitting of a process model. We analyzed
the transpiration of 475 4-year-old European beech
seedlings, belonging to eight full-sib families.
Approximately, one-third of the seedlings were kept in
well-watered conditions while the others were exposed
to drought for 14 days. Daily plant transpiration was
estimated as the difference between two subsequent
gravimetric measurements. A mechanistic model was
fitted to transpiration data separately for each tree. In
the model, the relationship of transpiration with vapor
pressure deficit and soil water deficit of each tree is
modulated by three parameters: maximum leaf conductance
(gMl
), maximum transpiration in well-watered
soil conditions ðEM0
l Þ and a parameter describing stomatal
sensitivity to soil water deficit (c). The model
successfully fitted most single tree data and a distribution
of estimates for the three parameters (gMl
, EM0
and c) was obtained. Predicted transpiration values
were in good agreement with observed data
(R2 = 0.86). The model approach produced parameters
significantly correlated with those of the ‘‘normalization
to control’’ approach. Estimated parameters vary
considerably among trees, suggesting the presence of
individual differences in stomatal behavior and response
to drought. In spite of a large among tree
(within family) variation, the among families component
for gMl
, EM0
l and c explained 9.5, 3.3 and 0.1% of
total parameters variation suggesting a significant genetic
control of transpiration processes
Validation of the brass index - blaylock risk assessment screen score - to evacuate patients' risk of problems after discharge from medical wards
No full text
Aeppli Cohomology and Gauduchon Metrics
No full textLet (M, J, g, ω) be a complete Hermitian manifold of complex dimension n≥ 2. Let 1 ≤ p≤ n- 1 and assume that ωn-p is (∂+ ∂ ̄) -bounded. We prove that, if ψ is an L2 and d-closed (p, 0)-form on M, then ψ= 0. In particular, if M is compact, we derive that if the Aeppli class of ωn-p vanishes, then HBCp,0(M)=0. As a special case, if M admits a Gauduchon metric ω such that the Aeppli class of ωn-1 vanishes, then HBC1,0(M)=0
Validation of the Brass Index – Blaylock Risk Assessment Screen Score – to evacuate the patients risk of problems after discharge from medical wards. Developing research in nursing, social care education and multisectorial cooperation
No full textInvito a Vico
No full textThis book contains eight essays on Vico written by Pietro Piovani between 1968 and 1976. It is the only collection of writings on Vico designed by the author, for a publication in Spanish. Although the single essays had the widest circulation and impact since their writing, this is the first time that the collection as it was conceived by the author it is published in Italian
Variability of stomatal conductance in a small and isolated population of Silver fir (Abies alba Mill.)
No full textWe analyzed the response to drought of 420 individuals from eight half-sib families from a small and isolated population of silver fir (Abies alba Mill.): 105 of them were kept in well-watered conditions as control while the remaining 315 were exposed to drought for 27 days. A model describing stomatal behavior derived from Monteith and developed in beech by Leonardi et al. was fitted to experimental transpiration data obtained simply from the difference between two daily pot weighings. The estimated parameters were maximum stomatal conductance, maximum transpiration in well-watered conditions and sensitivity to soil water deficit. The model worked well: convergence for all but four individuals and concordance between experimental and fitted data were good (R
2 = 0.86). Inter-individual variability for all three estimated parameters was high and two of them (maximum stomatal conductance and sensitivity to soil water deficit) were significantly different among families, suggesting genetic control. Our results validate the simplified method used to evaluate individual stomatal parameters. We also show that in the small and isolated population of our study substantial adaptive variability remains, a crucial prerequisite to endure environmental conditions determined by climatic change foreseen for the next decades
Effects of habitat fragmentation on genetic structure of beech populations in central Italy
No full textBott-Chern harmonic forms on complete Hermitian manifolds
No full textLet (M, J, g,ω) be a Hermitian manifold of complex dimension n. Assume that the torsion of the Chern connection Δ is bounded, and that there exists a C∞exhausting function ρ : M → R such that Δρ,Δ2ρ are bounded. We characterize W1,2 Bott-Chern harmonic forms, extending the usual result that holds on compact Hermitian manifolds. Finally, if (M,J, g,ω) is Kähler complete, ω = dη, with η bounded, and the sectional curvature is bounded, then we get a vanishing theorem for W1,2 Bott-Chern harmonic (p, q)-forms, if p + q ≠= n
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