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Search Results: 1 - 10 of 1190 matches for " Veronica Parolin "
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Life history and environment of Cecropia latiloba in Amazonian floodplains
Parolin,Pia;
Revista de Biología Tropical , 2002,
Abstract: cecropia latiloba can be considered to be one of the most efficient colonizers of open areas in the nutrient-rich whitewater floodplains of the amazon river. its main strategy to be successful is the high tolerance towards waterlogging and submergence, and the fast vertical growth and reiteration capacity. this, and the tolerance of high irradiation and sediment deposition allow c. latiloba to form large monospecific stands on open sites, and thus the first closed canopy which represents the initial phase of a successional sequence which leads to highly diverse forests. this tree is extremely well adapted to the adverse growth conditions in amazonian floodplains with prolongued periods of flooding and seedling submergence. the species occurs on the lowest levels in the flooding gradient. although it belongs to the most often cited species under aspects of taxonomy, species distribution and general descriptions of the ecosystem, little has been published about its ecology. in the present paper the ecological, physiological and phenological characteristics of c. latiloba are described. it is an evergreen species which constantly produces new leaves. with flooding, leaf production is reduced but new leaves are flushed also with prolongued flooding. the peak of flowering and fruiting are in the flooded period. when mature, the fruits are dispersed mainly by water and fish. seed germination occurs, without dormancy, within 5-13 days after water retreat. in the 7 months before the first flooded period seedlings reach 1 m of height, and height growth increases until a height of 15-20 m is achieved. photosynthetic assimilation is high, with values of up to 21 mmol co2m-2s-1 . c. latiloba is a very flood tolerant species, and waterlogged seedlings continuously produce new leaves and adventitiuos roots
Senna reticulata (Willd.) H. S. Irwin & Barneby (Fabaceae) as "pasture killer" ("matapasto") pioneer tree in Amazonian floodplains.
Pia Parolin
Ecología Aplicada , 2005,
Abstract: Senna reticulata (Willd.) H. S. Irwin & Barneby (Fabaceae) es un árbol pionero que coloniza áreas abiertas en las planicies inundables de la amazonía. Es muy abundante a lo largo de los ríos de aguas claras y nutritivas y puede considerarse uno de los más eficientes colonizadores de áreas abiertas. Las raíces y tallos poseen una alta tolerancia a la inundación y presenta una alta asimilación fotosintética y rápido crecimiento a pesar de la inundación prolongada; además la eficiente dispersión de la semilla y la habilidad para rebrotar después de un periodo de condiciones desfavorables, la hacen muy efectiva. Estas características llevan a la población local a considerar a Senna reticulata como una nociva maleza le osa, llamada matapasto ( pasture killer ) aunque en la secuencia sucesional represente una etapa le osa de corta duración, la cual permite el establecimiento de bosques altamente diversos.
Bosques inundados en la Amazonia Central: su aprovechamiento actual y potencial
Pia Parolin
Ecología Aplicada , 2002,
Abstract: Las áreas boscosas de várzea en la Amazonia Central son periódicamente inundadas por ríos de aguas blancas ricos en sedimentos, que por lo tanto tienen suelos ricos y alta producción primaria. Han sido descritas 250 especies de árboles como típicas, muchas de ellas tienen baja densidad forestal. A pesar que la producción total de madera no es tan alta como en el bosque templado, los bosques de várzea han sido explotados desde finales del siglo pasado. La fácil accesibilidad y el alto número de individuos de una especie por área es ventajosa. Los recursos naturales como la producción de petróleo, jabón, resinas, fibras textiles, taninos, colorantes y medicinas, perfumes, látex y frutas son de importancia local y comercial. La madera de construcción tiene mucha importancia desde principios de siglo, cuando fue usada para la producción de energía en las embarcaiones y en la construcción civil y naval. La extracción de madera de construcción comenzó, a gran escala, en la década de los 20. La extracción se realiza manualmente y la madera se transporta mediante en río hasta Manaus, donde la industria maderera está concentrada. El 80% de la madera procesada permanece en el estado de Amazonas. El resto es exportada, principalmente al sur del Brasil, mientras que no hay comercio internacional. Las áreas inundadas son de excepcional importancia económica, para el cultivo de alimentos como para la crianza de ganado vacuno lechero, lo cual lleva a la destrucción de las áreas forestales. Muchas especies de árboles usadas comercialmente son desplazadas, especialmente en la cercanía de las grandes ciudades.
Life history and environment of Cecropia latiloba in Amazonian floodplains
Pia Parolin
Revista de Biología Tropical , 2002,
Abstract: Cecropia latiloba can be considered to be one of the most efficient colonizers of open areas in the nutrient-rich whitewater floodplains of the Amazon river. Its main strategy to be successful is the high tolerance towards waterlogging and submergence, and the fast vertical growth and reiteration capacity. This, and the tolerance of high irradiation and sediment deposition allow C. latiloba to form large monospecific stands on open sites, and thus the first closed canopy which represents the initial phase of a successional sequence which leads to highly diverse forests. This tree is extremely well adapted to the adverse growth conditions in Amazonian floodplains with prolongued periods of flooding and seedling submergence. The species occurs on the lowest levels in the flooding gradient. Although it belongs to the most often cited species under aspects of taxonomy, species distribution and general descriptions of the ecosystem, little has been published about its ecology. In the present paper the ecological, physiological and phenological characteristics of C. latiloba are described. It is an evergreen species which constantly produces new leaves. With flooding, leaf production is reduced but new leaves are flushed also with prolongued flooding. The peak of flowering and fruiting are in the flooded period. When mature, the fruits are dispersed mainly by water and fish. Seed germination occurs, without dormancy, within 5-13 days after water retreat. In the 7 months before the first flooded period seedlings reach 1 m of height, and height growth increases until a height of 15-20 m is achieved. Photosynthetic assimilation is high, with values of up to 21 mmol CO2m-2s-1 . C. latiloba is a very flood tolerant species, and waterlogged seedlings continuously produce new leaves and adventitiuos roots Cecropia latiloba puede ser considerada una de las especies colonizadoras más eficientes de áreas abiertas en las llanuras inundadas de agua dulce, rica en nutrientes, del río Amazonas. Su principal estrategia para ser exitosa es la tolerancia al transporte por el agua y a permanecer sumergida, y su rápido crecimiento vertical y capacidad de reiteración. Esto, y la tolerancia a la alta irradiación y a la deposición de sedimentos permite a C. latiloba formar grandes parches monoespecíficos en sitios abiertos, y así el primer dosel cerrado el cual representa la fase inicial de la secuencia de sucesión que conduce a bosques altamente diversos. Este árbol, está extremadamente bien adaptado a las condiciones adversas de crecimiento en el terreno aluvial amazónico, con pr
Leptin/HER2 crosstalk in breast cancer: in vitro study and preliminary in vivo analysis
Elena Fiorio, Anna Mercanti, Marianna Terrasi, Rocco Micciolo, Andrea Remo, Alessandra Auriemma, Annamaria Molino, Veronica Parolin, Bruno Di Stefano, Franco Bonetti, Antonio Giordano, Gian Cetto, Eva Surmacz
BMC Cancer , 2008, DOI: 10.1186/1471-2407-8-305
Abstract: Expression of ObR, HER2, phospo-HER2 was assessed by immonoblotting. Physical interactions between ObR and HER2 were probed by immunoprecipitation and fluorescent immunostaining. Expression of leptin and ObR in breast cancer tissues was detected by immunohistochemistry (IHC). Associations among markers studied by IHC were evaluated using Fisher's exact test for count data.HER2 and ObR were coexpressed in all studied breast cancer cell lines. In MCF-7 cells, HER2 physically interacted with ObR and leptin treatment increased HER2 phosphorylation on Tyr 1248. In 59 breast cancers, the presence of leptin was correlated with ObR (the overall association was about 93%). This result was confirmed both in HER2-positive and in HER2-negative subgroups. The expression of leptin or ObR was numerically more frequent in larger (> 10 mm) tumors.Coexpression of HER2 and the leptin/ObR system might contribute to enhanced HER2 activity and reduced sensitivity to anti-HER2 treatments.Recent epidemiological and clinical data confirmed that obesity in postmenopausal women is associated with increased breast cancer risk, development of more aggressive breast tumors and resistance to certain anti-breast cancer treatments [1-4]. The molecular mechanisms of this link are not clear, but several studies in animal and cellular models suggested that excess body weight could promote breast cancer through increased production of an adipocyte-derived hormone leptin [5-7]. The primary function of leptin is to regulate energy balance and food intake by acting in the brain, but the hormone also plays an important role in peripheral organs, modulating fertility, lactation, and immune response [8,9]. Leptin levels in humans correlate with adiposity and are usually higher in females than in males [8].Leptin action is mediated through the transmembrane leptin receptor ObR [10]. The human ObR can be expressed as at least four isoforms with different COOH-terminal cytoplasmic domains [11]. The full (long)
Transport Infrastructures and Acceptability: the Role of Economic Evaluation for Conflict Mitigation Infrastrutture di trasporto e accettabilità: il ruolo della valutazione economica nella riduzione dei conflitti
Silvia Maffii,Riccardo Parolin
TeMA : Journal of Land Use, Mobility and Environment , 2012, DOI: 10.6092/1970-9870/531
Abstract: Large and medium-size transport infrastructure shall increasingly cope with acceptability-related problems. This is due to the lack of confidence that nowadays characterises the relations between public administrations and their citizens, as well as between citizens and the project promoters. Moreover, the subjects that take advantage from the project implementation and those not often do not coincide, whereas the latter are not compensated for the damages they bear. A sound cost-benefit analysis supporting the entire decision-making process may be a valuable tool for fostering the dialogue with all concerned subjects, provided that a set of basic conditions is met. Firstly, cost-benefit analysis has to be credible as far as the effects generated by the project are concerned. Therefore, it shall: (i) secure transparency of: results achieved by the evaluation (including the assumptions and criteria that led to such results), and procedures embedded into the evaluation process; (ii) be performed by independent evaluators rather than those sponsoring the project; (iii) be as much robust as possible, and finally (iv) deliver structured and thorough risk analyses. In order to reinforce credibility and soundness of the analysis and the evaluations undertaken, previous project experiences shall be duly taken into account, which implies fine-tuning ex-ante evaluations upon the basis of the results obtained by ex-post analysis of projects already implemented. Additionally, the evaluation shall be dynamic, as it shall back since the very beginning the whole process of infrastructure designing, and until the project is finalised. Transparency of such process is then a key pre-requisite. The second condition refers to the fact that stakeholders interested into the project shall be actively involved into the planning process. Further major token is that the economic evaluation at the level of approximation featuring the various steps of the project cycle feeds and frame the public debate on the project implementation. This article is based upon results from research activities, enriched with the explanation of few recent case-studies. Grandi e medie infrastrutture di trasporto hanno sempre maggiori problemi di accettabilità. Ciò è dovuto alla crisi di fiducia che ormai contraddistingue i rapporti tra amministrazioni e cittadini e tra proponenti e cittadini e al fatto che spesso i soggetti avvantaggiati e i soggetti danneggiati dal progetto non coincidono e i danneggiati non sono compensati per i danni che subiscono. Una corretta valutazione dei costi e dei benefici,
Rings whose proper factors are right perfect
Alberto Facchini,Catia Parolin
Mathematics , 2010,
Abstract: We show that practically all the properties of almost perfect rings discovered by Bazzoni and Salce in "Almost perfect domains" (Colloq. Math. 95 (2) (2003), 285-301) for commutative rings hold in the non-commutative setting.
Extremely Early Diagnostic Test for Prostate Cancer  [PDF]
Veronica Jean James
Journal of Cancer Therapy (JCT) , 2011, DOI: 10.4236/jct.2011.23051
Abstract: Purpose: This article reports the results of a blinded fibre diffraction study of skin samples taken from TRAMP mice and age-matched controls to determine whether changes noted in fibre diffraction studies of human skin were present in these TRAMP mice studies. These mice are bred to progress to Gleeson Type 3 to Type 5 prostate cancer. Methods: Small strips, 1 mm × 5 mm, cut from the mouse skin samples were loaded into cells in the same way as human samples and slightly stretched to remove the crimp. They remained fully hydrated throughout exposure to the synchrotron beam. Results: The added change that was reported for prostate cancer in 2009 was obtained for all TRAMP mice samples, indicating that this change can be read as High Grade Cancer in human diagnostic tests. Discussion: These changes were evident for all 3 and 7 week old TRAMP mice samples but not for any of the control samples. This indicates that the changes in the fibre diffraction patterns appear much earlier than in any other available prostate cancer diagnostic test, as none of these can verify the presence of prostate cancer in the TRAMP mice before 10 weeks of age. The fibre diffraction test is therefore the most accurate and earliest test for high grade prostate cancer.
The Molecular Architecture for the Intermediate Filaments of Hard α-Keratin Based on the Superlattice Data Obtained from a Study of Mammals Using Synchrotron Fibre Diffraction
Veronica James
Biochemistry Research International , 2011, DOI: 10.1155/2011/198325
Abstract: High- and low-angle X-ray diffraction studies of hard α-keratin have been studied, and various models have been proposed over the last 70 years. Most of these studies have been confined to one or two forms of alpha keratin. This high- and low-angle synchrotron fibre diffraction study extends the study to cover all available data for all known forms of hard α-keratin including hairs, fingernails, hooves, horn, and quills from mammals, marsupials, and a monotreme, and it confirms that the model proposed is universally acceptable for all mammals. A complete Bragg analysis of the meridional diffraction patterns, including multiple-time exposures to verify any weak reflections, verified the existence of a superlattice consisting of two infinite lattices and three finite lattices. An analysis of the equatorial patterns establishes the radii of the oligomeric levels of dimers, tetramers, and intermediate filaments (IFs) together with the centre to centre distance for the IFs, thus confirming the proposed helices within helices molecular architecture for hard α-keratin. The results verify that the structure proposed by Feughelman and James meets the criteria for a valid α-keratin structure.
Closing the Global Energy and Nutrient Cycles through Application of Biogas Residue to Agricultural Land – Potential Benefits and Drawback
Veronica Arthurson
Energies , 2009, DOI: 10.3390/en20200226
Abstract: Anaerobic digestion is an optimal way to treat organic waste matter, resulting in biogas and residue. Utilization of the residue as a crop fertilizer should enhance crop yield and soil fertility, promoting closure of the global energy and nutrient cycles. Consequently, the requirement for production of inorganic fertilizers will decrease, in turn saving significant amounts of energy, reducing greenhouse gas emissions to the atmosphere, and indirectly leading to global economic benefits. However, application of this residue to agricultural land requires careful monitoring to detect amendments in soil quality at the early stages.
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