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Search Results: 1 - 10 of 10773 matches for " Claudia Degano "
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Respuestas morfológicas y anatómicas de Tessaria absinthioides (Hook. et Arn.) DC. a la salinidad
DEGANO, CLAUDIA A. M.;
Brazilian Journal of Botany , 1999, DOI: 10.1590/S0100-84041999000300002
Abstract: t. absinthioides, inuleae, compositae, is a weedy species that is spreading in the irrigation area of the colorado river, argentina. this species can be found in normal and saline soils. morphological and anatomical variables were measured with two salts, sodium chloride and sodium sulfate, with three levels of osmotic potential -0.4, -0.8 and -1.5 mpa, in hydroponic culture, using hoagland solution as the cultivation media. the total diameter of the roots of plants growing in na2so4 and nacl increased when the osmotic potential was -0.4 mpa. in plants growing in nacl this may have resulted from the increase in the size of the cortical cells and in plants growing in na2so4, the diameter increased may be due to an increase in the cambial activity. the number and length of shoot internodes decreased with increasing salinity, even though this was not statistically significant. in comparison to the control, the total diameter of the shoot increased at -0.4 mpa and decreased with the reduction of the osmotic potential. in comparison to the control, the length of the leaves decreased at -0.4 mpa and the leaves width increased at the same concentration. the palisade parenchyma appeared less developed in saline conditions. in comparison to the control, the number of hairs increased at -0.4 mpa. t. absinthioides acts as a semihalophytic species, according to the salt ranks it tolerates. the mechanisms of adaptation to saline conditions are succulence in root and stunted growth if the salt in the media is nacl, and the production of haloxeromorphic characters if the salt in the media is na2 so4
Respuestas morfológicas y anatómicas de Tessaria absinthioides (Hook. et Arn.) DC. a la salinidad
DEGANO CLAUDIA A. M.
Brazilian Journal of Botany , 1999,
Abstract: T. absinthioides, Inuleae, Compositae, is a weedy species that is spreading in the irrigation area of the Colorado River, Argentina. This species can be found in normal and saline soils. Morphological and anatomical variables were measured with two salts, sodium chloride and sodium sulfate, with three levels of osmotic potential -0.4, -0.8 and -1.5 MPa, in hydroponic culture, using Hoagland solution as the cultivation media. The total diameter of the roots of plants growing in Na2SO4 and NaCl increased when the osmotic potential was -0.4 MPa. In plants growing in NaCl this may have resulted from the increase in the size of the cortical cells and in plants growing in Na2SO4, the diameter increased may be due to an increase in the cambial activity. The number and length of shoot internodes decreased with increasing salinity, even though this was not statistically significant. In comparison to the control, the total diameter of the shoot increased at -0.4 MPa and decreased with the reduction of the osmotic potential. In comparison to the control, the length of the leaves decreased at -0.4 MPa and the leaves width increased at the same concentration. The palisade parenchyma appeared less developed in saline conditions. In comparison to the control, the number of hairs increased at -0.4 MPa. T. absinthioides acts as a semihalophytic species, according to the salt ranks it tolerates. The mechanisms of adaptation to saline conditions are succulence in root and stunted growth if the salt in the media is NaCl, and the production of haloxeromorphic characters if the salt in the media is Na2 SO4
Macrovascular complication phenotypes in type 2 diabetic patients
Giuseppe Papa, Claudia Degano, Maria P Iurato, Carmelo Licciardello, Raffaella Maiorana, Concetta Finocchiaro
Cardiovascular Diabetology , 2013, DOI: 10.1186/1475-2840-12-20
Abstract: A diabetic outpatient cohort (n = 1199) was retrospectively studied. Demographic, clinical and laboratory parameters were included in analyses. A thorough cardiovascular history as documented by previous medical records (including medical and hospital records) and vascular laboratory studies (including standardised electrocardiogram, echocardiogram, provocative tests for cardiac ischaemia, ankle/brachial index, duplex ultrasonography of the carotid and lower limbs and, in selected cases, computed tomography angiography, carotid and peripheral arteriography and evaluation of transcutaneous oxygen pressure), was collected for all of the patients. Standardised procedures were used to assess microvascular complications as well as metabolic syndrome (Mets).The unadjusted MVD prevalence was 46.4% among the participants. The majority of patients with MVD were in the PVD group. In the multivariate analysis, age, male sex and diabetes duration were independent risk factors for PAD and PVD (P < 0.01). A low HDL-C value was an independent risk factor in the CAD and PVD groups (P = 0.03). Very high frequencies of MetS were observed in the PAD and PVD groups (94.9 and 95.7% respectively). The most MetS diagnostic criteria were recorded among members of the CAD group (all or all-1 criteria were present in 73% of patients). The average age in the CAD group (64.5 y) was comparable to that of the NMVD group. Microvascular complications were more frequent in the PAD and PVD patients.Phenotypic heterogeneity is associated with different macrovascular complications in T2DM patients. These findings might have clinical implications for developing diagnostic and therapeutic strategies targeting type 2 diabetes.Cardiovascular complications are the leading cause of morbidity and mortality among patients with type 2 diabetes, and cardiovascular disease (CVD) risk is 2- to 8-fold higher in the diabetic population than it is in non-diabetic individuals of a similar age, sex and ethnicity [1,2]
Statistical studies on anatomical modifications in the radicle and hypocotyl of cotton induced by NaCl
CASENAVE,ESTER C; DEGANO,CLAUDIA AM; TOSELLI,MARIA E; CATAN,ESTELA A;
Biological Research , 1999, DOI: 10.4067/S0716-97601999000400008
Abstract: salinity affects extensive arid and semiarid areas all over the world, producing diminished yields of many crops. even though there is a variety of research and reviews related to physiological and anatomical modifications produced in salinity-tolerant species, today there are different points of view in relation to this topic, and especially due to technical limitations, there are few articles in which anatomical modifications have been quantified. the aim of this research is to quantitatively and statistically evaluate the modifications that are produced in radicles and hypocotyles of cotton seedlings growing in nacl concentrations that affect the early ontogenetic stages of this crop. germination of two varieties of cotton at increasing concentrations (0 to 450 meq/l) of nacl was studied as well as the growth of seedlings after their germination in water. anatomical modifications induced in radicles and hypocotyles were analyzed quantitatively with an image analyzer. there were no differences among varieties. while the percentage of germination decreased at the 252 meq/l nacl level, the velocity of the process and seedling growth was inhibited at lower concentrations. with increased salinity, the cortex and pith of radicle increased in width, while the xylem decreased. in the hypocotyl, the width of cortex increased, as did the number and diameter of gossypol glands. this change deserves further studies in relation to the participation of these glands in the capacity of the seedlings to tolerate salinity
Statistical studies on anatomical modifications in the radicle and hypocotyl of cotton induced by NaCl
ESTER C CASENAVE,CLAUDIA AM DEGANO,MARIA E TOSELLI,ESTELA A CATAN
Biological Research , 1999,
Abstract: Salinity affects extensive arid and semiarid areas all over the world, producing diminished yields of many crops. Even though there is a variety of research and reviews related to physiological and anatomical modifications produced in salinity-tolerant species, today there are different points of view in relation to this topic, and especially due to technical limitations, there are few articles in which anatomical modifications have been quantified. The aim of this research is to quantitatively and statistically evaluate the modifications that are produced in radicles and hypocotyles of cotton seedlings growing in NaCl concentrations that affect the early ontogenetic stages of this crop. Germination of two varieties of cotton at increasing concentrations (0 to 450 meq/l) of NaCl was studied as well as the growth of seedlings after their germination in water. Anatomical modifications induced in radicles and hypocotyles were analyzed quantitatively with an image analyzer. There were no differences among varieties. While the percentage of germination decreased at the 252 meq/l NaCl level, the velocity of the process and seedling growth was inhibited at lower concentrations. With increased salinity, the cortex and pith of radicle increased in width, while the xylem decreased. In the hypocotyl, the width of cortex increased, as did the number and diameter of gossypol glands. This change deserves further studies in relation to the participation of these glands in the capacity of the seedlings to tolerate salinity
Emergency treatments in pulmonary arterial hypertension: a place for algorithms and for education programmes
B. Degano
European Respiratory Review , 2010,
Abstract:
Genetic parameters for calving ease in Italian Simmental cattle
L. Degano,D. Vicario
Italian Journal of Animal Science , 2010, DOI: 10.4081/ijas.2007.1s.117
Abstract: Estimated breeding values for Calving Ease for Italian Simmental bulls are not available, so it is not possible to develop appropriate mating schemes.The aim of this study was to estimate genetic parameters for calving ease in Italian Simmental cows, using a bivariate linear animal model. Calving ease scores for first and later parities cows were considered as different but correlated traits. The model accounted for contemporary groups, sex of calf, season of calving within region, and age at calving within parity effects; both direct and maternal genetic effects were considered. Heritabilities of direct (4.9-3.2%) and maternal (3.4%-1.2%) effects were comparable to values reported for other Simmental populations. The genetic correlation between first and later parities calving ease was 0.974 and 0.779 for direct and maternal genetic effects, respectively. The genetic correlation between direct and maternal effects was –0.331 and –0.412 for first and later parities, respectively. Genetic evaluation for calving difficulty is feasible, but is necessary to improve the quality of the data.
A Computational Approach to the Functional Screening of Genomes
Davide Chiarugi,Pierpaolo Degano,Roberto Marangoni
PLOS Computational Biology , 2007, DOI: 10.1371/journal.pcbi.0030174
Abstract: Comparative genomics usually involves managing the functional aspects of genomes, by simply comparing gene-by-gene functions. Following this approach, Mushegian and Koonin proposed a hypothetical minimal genome, Minimal Gene Set (MGS), aiming for a possible oldest ancestor genome. They obtained MGS by comparing the genomes of two simple bacteria and eliminating duplicated or functionally identical genes. The authors raised the fundamental question of whether a hypothetical organism possessing MGS is able to live or not. We attacked this viability problem specifying in silico the metabolic pathways of the MGS-based prokaryote. We then performed a dynamic simulation of cellular metabolic activities in order to check whether the MGS-prokaryote reaches some equilibrium state and produces the necessary biomass. We assumed these two conditions to be necessary for a living organism. Our simulations clearly show that the MGS does not express an organism that is able to live. We then iteratively proceeded with functional replacements in order to obtain a genome composition that gives rise to equilibrium. We ruled out 76 of the original 254 genes in the MGS, because they resulted in duplication from a functional point of view. We also added seven genes not present in the MGS. These genes encode for enzymes involved in critical nodes of the metabolic network. These modifications led to a genome composed of 187 elements expressing a virtually living organism, Virtual Cell (ViCe), that exhibits homeostatic capabilities and produces biomass. Moreover, the steady-state distribution of the concentrations of virtual metabolites that resulted was similar to that experimentally measured in bacteria. We conclude then that ViCe is able to “live in silico.”
Composición botánica de la dieta de caprinos en un bosque del Chaco semiárido (Argentina)
Catan,A.; Degano,C. A. M.;
Quebracho (Santiago del Estero) , 2007,
Abstract: the aim of this work was to determine the seasonal variation of botanical composition and diversity of the goats' diets grazing during the day, in a forest of the chaco semiarid region, argentina. this area has clearly defined seasons, dry during the winter-spring and wet during summer-autumn. the goats are a very important resource in the region because of their good adaptation. the trial was conducted with 2,5 animals/ha, grazing during the day, and kept at corral in the night. the botanical composition of diet was determined using the microhistological method of feces; diversity index was estimated using shannon and weaver index, and the preference index was estimated using krueger index. the herbage components of the diet were organized as: dicotyledonous herbs, grasses, woody species and epifitic species. the dicotyledonous herbs were preferred by the goats in the wet seasons, and grasses and woody species were preferred in dry seasons. the diversity index suggests the specialistic behavior of goats in the dry season, and generalistic behavior in the wet season, in function of availability of forage.
Trajectory based models. Evaluation of minmax pricing bounds
Ivan Degano,Sebastian Ferrando,Alfredo Gonzalez
Quantitative Finance , 2015,
Abstract: The paper studies market models based on trajectory spaces, properties of such models are obtained without recourse to probabilistic assumptions. For a given European option, an interval of rational prices exists under a more general condition than the usual no-arbitrage requirement. The paper develops computational results in order to evaluate the option bounds; the global minmax optimization, defining the price interval, is reduced to a local minmax optimization via dynamic programming. A general class of trajectory sets is described for which the market model introduced by Britten Jones and Neuberger is nested as a particular case. We also develop a market model based on an operational setting constraining market movements and investor's portfolio rebalances. Numerical examples are presented, the effect of the presence of arbitrage on the price bounds is illustrated.
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