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Search Results: 1 - 10 of 580 matches for " Vagner Maximino;Rosolem "
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Coffee leaf and stem anatomy under boron deficiency
Rosolem, Ciro Antonio;Leite, Vagner Maximino;
Revista Brasileira de Ciência do Solo , 2007, DOI: 10.1590/S0100-06832007000300007
Abstract: boron deficiency in coffee is widely spread in brazilian plantations, but responses to b fertilizer have been erratic, depending on the year, form and time of application and b source. a better understanding of the effects of b on plant physiology and anatomy is important to establish a rational fertilization program since b translocation within the plant may be affected by plant anatomy. in this experiment, coffee plantlets of two varieties were grown in nutrient solutions with b levels of 0.0 (deficient), 5.0 μm (adequate) and 25.0 μm (high). at the first symptoms of deficiency, leaves were evaluated, the cell walls separated and assessed for b and ca concentrations. scanning electron micrographs were taken of cuts of young leaves and branch tips. the response of both coffee varieties to b was similar and toxicity symptoms were not observed. boron concentrations in the cell walls increased with b solution while ca concentrations were unaffected. the ca/b ratio decreased with the increase of b in the nutrient solution. in deficiency of b, vascular tissues were disorganized and xylem walls thinner. b-deficient leaves had fewer and deformed stomata.
Gibberellin and cytokinin effects on soybean growth
Leite, Vagner Maximino;Rosolem, Ciro Antonio;Rodrigues, Jo?o Domingos;
Scientia Agricola , 2003, DOI: 10.1590/S0103-90162003000300019
Abstract: soybean is an important crop in brazil. nonetheless, there are no reports on the use of plant growth regulator potential in relation to this crop in the national literature. to better understand the role of these compounds, a pot experiment was carried out to study effects of ga3 and cytokinin on the vegetative growth of the soybean. ga3 (50 mg l-1) was applied as seed treatment, leaving plants with water application as control. ga3 (100 mg l-1) and cytokinin (30 mg l-1) were sprayed on leaves at the physiological stage v3/v4, and 15 days after, cytokinin (30 mg l-1), also as foliar spray. seed treatment decreased plant emergence and initial soybean root growth, but as the season progressed, differences in root growth disappeared; plants were shorter, and presented a decrease in the number of nodes, in stem diameter, in leaf area and in dry matter yield. conversely, foliar application of ga3 led to an increase in plant height, first node height and stem diameter. leaf area and dry matter production also increased as a result of ga3 foliar application. there was no effect of exogenous gibberellin and cytokinin on the number of soybean leaves, number of stem branches and root dry matter. joint application of gibberellin and cytokinin tended to inhibit gibberellin effects. cytokinin applied to leaves during soybean vegetative growth was not effective in modifying any of the evaluated plant growth variables.
Gibberellin and cytokinin effects on soybean growth
Leite Vagner Maximino,Rosolem Ciro Antonio,Rodrigues Jo?o Domingos
Scientia Agricola , 2003,
Abstract: Soybean is an important crop in Brazil. Nonetheless, there are no reports on the use of plant growth regulator potential in relation to this crop in the national literature. To better understand the role of these compounds, a pot experiment was carried out to study effects of GA3 and cytokinin on the vegetative growth of the soybean. GA3 (50 mg L-1) was applied as seed treatment, leaving plants with water application as control. GA3 (100 mg L-1) and cytokinin (30 mg L-1) were sprayed on leaves at the physiological stage V3/V4, and 15 days after, cytokinin (30 mg L-1), also as foliar spray. Seed treatment decreased plant emergence and initial soybean root growth, but as the season progressed, differences in root growth disappeared; plants were shorter, and presented a decrease in the number of nodes, in stem diameter, in leaf area and in dry matter yield. Conversely, foliar application of GA3 led to an increase in plant height, first node height and stem diameter. Leaf area and dry matter production also increased as a result of GA3 foliar application. There was no effect of exogenous gibberellin and cytokinin on the number of soybean leaves, number of stem branches and root dry matter. Joint application of gibberellin and cytokinin tended to inhibit gibberellin effects. Cytokinin applied to leaves during soybean vegetative growth was not effective in modifying any of the evaluated plant growth variables.
Evolutionary Changes in the Complexity of the Tectum of Nontetrapods: A Cladistic Approach
Caio Maximino
PLOS ONE , 2008, DOI: 10.1371/journal.pone.0003582
Abstract: Background The tectum is a structure localized in the roof of the midbrain in vertebrates, and is taken to be highly conserved in evolution. The present article assessed three hypotheses concerning the evolution of lamination and citoarchitecture of the tectum of nontetrapod animals: 1) There is a significant degree of phylogenetic inertia in both traits studied (number of cellular layers and number of cell classes in tectum); 2) Both traits are positively correlated accross evolution after correction for phylogeny; and 3) Different developmental pathways should generate different patterns of lamination and cytoarchitecture. Methodology/Principal Findings The hypotheses were tested using analytical-computational tools for phylogenetic hypothesis testing. Both traits presented a considerably large phylogenetic signal and were positively associated. However, no difference was found between two clades classified as per the general developmental pathways of their brains. Conclusions/Significance The evidence amassed points to more variation in the tectum than would be expected by phylogeny in three species from the taxa analysed; this variation is not better explained by differences in the main course of development, as would be predicted by the developmental clade hypothesis. Those findings shed new light on the evolution of an functionally important structure in nontetrapods, the most basal radiations of vertebrates.
Modulation of nociceptive-like behavior in zebrafish (Danio rerio) by environmental stressors
Maximino, Caio;
Psychology & Neuroscience , 2011, DOI: 10.3922/j.psns.2011.1.017
Abstract: zebrafish have been demonstrated to react consistently to noxious chemical stimuli and present reliable phenotypes of stress, fear, and anxiety. in this article, we describe the modulation of nociceptive-like responses of zebrafish to fear-, stress-, and anxiety-eliciting situations. animals were exposed to an alarm substance, confinement stress, or a novel environment before being injected with 1% acetic acid in the tail. the alarm substance and confinement stress reduced the display of erratic movements and tail-beating behavior elicited by acetic acid. the novelty of the environment, in contrast, increased the frequency of tail-beating behavior. the results suggest that descending modulatory control of nociception exists in zebrafish, with apparent fear- and stress-induced analgesia and anxiety-induced hyperalgesia.
Modulation of nociceptive-like behavior in zebrafsh (Danio rerio) by environmental stressors
Caio Maximino
Psychology & Neuroscience , 2011,
Abstract: Zebrafsh have been demonstrated to react consistently to noxious chemical stimuli and present reliable phenotypes of stress, fear, and anxiety. In this article, we describe the modulation of nociceptive-like responses of zebrafsh to fear-, stress-, and anxiety-eliciting situations. Animals were exposed to an alarm substance, confnement stress, or a novel environment before being injected with 1% acetic acid in the tail. The alarm substance and confnement stress reduced the display of erratic movements and tail-beating behavior elicited by acetic acid. The novelty of the environment, in contrast, increased the frequency of tail-beating behavior. The results suggest that descending modulatory control of nociception exists in zebrafsh, with apparent fear- and stress-induced analgesia and anxiety-induced hyperalgesia.
Dynamics of Boolean Networks with Scale-Free Topology
Maximino Aldana
Physics , 2002,
Abstract: The dynamics of Boolean networks (the N-K model) with scale-free topology are studied here. The existence of a phase transition governed by the value of the scale-free exponent of the network is shown analytically by analyzing the overlap between two distinct trajectories. The phase diagram shows that the phase transition occurs for values of the scale-free exponent in the open interval (2,2.5). Since the Boolean networks under study are directed graphs, the scale-free topology of the input connections and that of the output connections are studied separately. Ultimately these two topologies are shown to be equivalent. An important result of this work is that the fine-tuning usually required to achieve stability in Boolean networks with a totally random topology is no longer necessary when the network topology is scale-free.
Treatment of Bilateral Recurrent Dislocation of Hip Pros-thesis with Malpositioned Well-Fixed Shell: A Case Report  [PDF]
Fernando Judas, Luis Maximino, Francisco Lucas
Open Journal of Orthopedics (OJO) , 2013, DOI: 10.4236/ojo.2013.33031
Abstract: Dislocations of total hip prostheses cause pain and patient dissatisfaction. Recurrent dislocations are difficult to treat mainly when the acetabular metal shell is well-fixed. The purpose of this article was to describe the surgical technique used for the treatment of a bilateral recurrent posterior dislocation after a cementless total hip prosthesis, caused by excessive inclination of acetabular components, in a 72-year-old patient. On both sides, acetabular metal shell, porouscoated, was well-fixed. Revision of the entire acetabular component could be an appropriate therapeutic option because it was malpositioned. Nevertheless, a conservative operation was performed. The metal shell was left in situ and the preexisting polyethylene liner was removed and replaced by a new undersized cross-linked polyethylene liner, then, cemented into the shell and properly oriented. An acetabular cemented augmentation reinforced by 3 cortical screws was associated with the reconstruction. This report suggests that cementation of new liner into a malpositioned well- fixed metal shell associated with an acetabular cemented augmentation is a simple and safe technique for the management of recurrent hip dislocation, for elderly patients in which it is advisable to avoid a major revision hip surgery by medical comorbidities. Nonetheless, further studies with medium-and long-term follow-up are needed to validate this technique.
Mito e história em Iracema: a recep??o crítica mais recente
Camilo, Vagner;
Novos Estudos - CEBRAP , 2007, DOI: 10.1590/S0101-33002007000200014
Abstract: the essay intends to analyze the tendency of the recent critical reception of iracema (1865) to centralize interpretations on the relations between myth and history. it also intends to define a position vis-à-vis such discussion, defending or questioning some of the hypotheses with arguments that might contribute for the debate.
Jorge de Lima no contexto da poesia negra americana
Camilo, Vagner;
Estudos Avan?ados , 2012, DOI: 10.1590/S0103-40142012000300025
Abstract: the purpose of this essay is to examine the context of jorge de lima`s poemas negros (1947) publication, by firstly analyzing the formation and consolidation of the canon of african american poetry and then tracking their impact on brazilian literary scene along the years 1930 and 1940, in particular at revista acadêmica, which is responsible for publishing of jorge de lima`s book. finally, this essay studies the inclusion of poemas negros in this debate by examining the boundaries or the ideological contradictions of his poetic project.
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