Search results for "growth"
showing 10 items of 5134 documents
Hydraulic kinetics of the graft union in different Olea europaea L. scion/rootstock combinations
2007
The hydraulic resistance of young olive trees grafted on rootstocks with contrasting size-controlling potential was measured 30, 90, 360 and 480 days after grafting. Olive (Olea europaea L.) clones inducing plant vigorous growth (Leccino ‘Minerva’, LM) or dwarfing (Leccino ‘Dwarf’, LD) were studied in different scion/rootstock combinations (LD/LD, LD/LM, LM/LD, LM/LM). Plants growing on LD root systems developed lower leaf surface areas (about 50% less) than plants grafted on LM rootstocks. Graft union represented the largest fraction (up to 85%) of whole-plant hydraulic resistance 30 days after grafting, and still represented an important fraction of it 2 months later (40–55%). Four-hundre…
Seasonal cardenolide production and Dop5βr gene expression in natural populations of Digitalis obscura
2004
Productivity variations and seasonal fluctuations of cardenolides have been studied in 10 natural populations of Digitalis obscura distributed in three bioclimatic belts. Main cardenolides in D. obscura plants are those of the series A and such predominance (ca. 80-85%) over the series B metabolites is independent of the population studied or the degree of maturity of the leaves. Primary glycosides represent ca. 50-60% of total cardenolides; this percentage did not vary among populations or with the leaf age but increased in summer and decreased in winter. A correlation analysis between plant biomass and cardenolide content showed a positive relationship of these parameters, which, accordin…
Growth of Ice Particles by Accretion and Ice Particle Melting
2010
In Chapter 13, we discussed the growth of snow crystals by vapor diffusion, and in Chapter 14, we described the manner with which snow crystals interact with other snow crystals and with drops. In this chapter, we shalllook closer at the growth of ice particles by the accretion of supercooled drops, at the formation of snow flakes by the collision of snow crystals, and also consider the physics of melting of individual ice particles.
The impact of wood-derived biochar on the survival of Trichoderma spp. and growth of Secale cereale L. in sandy soil
2018
The interrelations between biochar (BC) and soil microbiota remain unclear. Addressing this will be important for understanding how BC affects soil properties and plant growth. Here, we tested the ...
Les incitations à l'innovation dans le secteur privé
2011
En ligne sur http://www.cairn.info/load_pdf.php?ID_ARTICLE=REL_792_0045; International audience; L'innovation est devenue un facteur clé de la croissance économique. La question des incitations à l'innovation au sein des entreprises est donc primordiale. Dans ce papier, nous nous intéressons au type d'incitations monétaires reçues par les inventeurs au sein des entreprises avec une attention particulière à la mobilité inter-entreprise de ces derniers. Les résultats montrent un rendement salarial positif pour les inventeurs, celui-ci est plus important pour les inventeurs ayant connu une mobilité inter-entreprise, ce qui pourrait suggérer que les entreprises sont prêtes à payer les connaissa…
Growth pattern of underlithified strata during thrust-related folding
2004
Abstract Asymmetric anticlines with overturned or steeply dipping forelimbs and gently dipping backlimbs are generally interpreted as thrust-related folds. Fold asymmetry occurs as a consequence of forelimb rotation. If deformation takes place in environments dominated by submarine sedimentation, the limbs coincide with the slope (depositional surface) and rotation reflects slope steepening. If folds are nucleated in poorly or unlithified deposits, growth geometry also depends on the properties of the media, such as cohesion and the angle of internal friction. For cohesionless deposits, the tilting of the slope influences the equilibrium of the soft sediments, resulting in gravity-driven fl…
The child with overgrowth between clinical variability and genetic heterogeneity
2020
Either in the newborn or in the child overgrowth can be generalized or localized if it is limited to one or more body regions. When overgrowth depends on a metabolic imbalance, or it is constitutional, the excessive growth can be the only clinical sign. In most cases genomic or epigenetic alterations, which affect factors involved in cell proliferation and/or regulation of gene expression (observed also in tumours), are related to overgrowth syndromes, in which excess growth may be associated with dysmorphic features, neuromotor/intellectual disabilities and behavioural disorders. These rare conditions are characterized by clinical and molecular overlap. The paper describes the cases of thr…
Analysis of a parabolic cross-diffusion population model without self-diffusion
2006
Abstract The global existence of non-negative weak solutions to a strongly coupled parabolic system arising in population dynamics is shown. The cross-diffusion terms are allowed to be arbitrarily large, whereas the self-diffusion terms are assumed to disappear. The last assumption complicates the analysis since these terms usually provide H 1 estimates of the solutions. The existence proof is based on a positivity-preserving backward Euler–Galerkin approximation, discrete entropy estimates, and L 1 weak compactness arguments. Furthermore, employing the entropy–entropy production method, we show for special stationary solutions that the transient solution converges exponentially fast to its…
Rewards, changes and challenges in the role of primary headteachers/principals in England and Finland
2012
Drawing on an analysis of education policies and qualitative research data, the impact of education reform on the roles of English primary headteachers and their Finnish counterparts is examined and compared. Global forces have resulted in similar policy trends in both countries but owing to contrasting cultural values and education traditions there are marked differences in the mechanisms for change at both national and local levels. However, irrespective of globalisation and differing national contexts, there were considerable similarities in the perspectives of headteachers and principals on the rewards and constraints of their role and the realities of leadership and management.
Senescence-associated HSP60 expression in normal human skin fibroblasts
2005
Normal mammalian fibroblasts cultured in vitro undergo a limited number of divisions before entering a senescent phase in which they can be maintained for long periods but cannot be induced to divide. Senescent cells become unresponsive to growth-promoting signals and exhibit senescent cell morphology with flattened and enlarged cell shape. Several chaperones have a direct effect on cellular senescence. HSP60 has been largely studied in our laboratories and it has been associated with uncontrolled cell proliferation in tumor cells. Since senescence is firmly regulated during cell cycle progression, we wanted to investigate HSP60 protein level during cellular senescence. Our data show that H…