Time filter

Source Type


Sao Jose A.R.,UESB DFZ | do Prado N.B.,UESC | Reboucas T.N.H.,UESB DFZ | e Mendes H.T.A.,UESB
Revista Brasileira de Fruticultura | Year: 2014

Mineral nutrition is related to the growth and reproduction physiology of Annonaceae. Each species of Annona genus has a genetic load that presents specific nutritional requirements for their metabolic functions. The absorption march of nutrients is fundamental for determining the appropriate development stage and doses of applying fertilizers and getting the maximum productive yield. There are few scientific studies about nutrition and fertilization in this family, in spite of requiring large amount of nutrients. This study has the purpose of presenting major mineral requirements in Annona genus, with emphasis on custard apple (A. squamosa) and soursop (A. muricata), related to vegetative and reproductive growth and fruit quality (sugar content, acidity, firmness and crack fruit, etc.). The mineral absorption march in soursop during growth of seedlings is in decreasing order: K>N>Ca>Mg>P and Fe>Zn>Mn>Cu. Significant amount of N, K, Ca, Mg and P are extracted by Annonaceae as compared to other fruits. The export of nutrients by sugar apple is superior to those exported by oranges, pineapple, avocado and many other fruits. In respect of the micronutrient is known that B and Zn are very important in tropical soil with pH below 6.5. Nevertheless, in soil with pH superior to 7.0 Fe and other micronutrients may be restrictive to Annona growth and reproduction. The increasing importance of fresh and processing markets requires scientific investigations in absorption march and nutrition for the various species of Annonaceae.

de Araujo Guimaraes D.A.,Federal University of Para | de Garcia S.C.G.,Federal University of Para | le Pendu Y.,UESC
Acta Amazonica | Year: 2011

The main objective of this work was to study the estrous cycle of collared peccary by vaginal cytology. Samples were collected in 10 adult females, three times a week, for six months. The estrous cycle period for this specie was 28.45 ± 5.45 days. We observed a significant difference (p<0.01) between the cell types in the same phase of the oestrous cycle. During the proestrus phase, the exfoliative cytology arrangement showed high frequency of intermediate and superficial cells. The estrus phase had elevated rates of superficial cells, when compared to the other types, and an absence of leukocytes. During this phase, the external genitalia were reddish, tumescent; and the cervical mucus was evident. In the metaestrus phase, we observed a decrease of superficial cells, as well as the highest indices of intermediate cells, an increase of leukocytes and the presence of metestrus and foam cells. In the diestrus phase, the intermediate cells increased and leukocytes decreased. In conclusion, the present study suggests that it is possible to differentiate the phase of estrous cycle by vaginal cytology.

Lima E.M.,State University of Santa Cruz | Pereira N.E.,State University of Santa Cruz | Barbosa A.M.M.,State University of Santa Cruz | Correa R.X.,UESC
Crop Breeding and Applied Biotechnology | Year: 2013

The 32 cacao clones selected as being resistant following the witches' broom epidemic and for having distinct productivity were characterized according to their genetic diversity and were submitted to a new selection. These plants were assessed for eight years at the Oceania Farm (FO) in Itagibá, Bahia, Brazil. The 13 microsatellite primers generated an average of 11.7 amplicons per locus, and based on them it was demonstrated that the 32 clones distribute themselves in groups apart from the nine clones used as controls. The 32 materials displayed significant differences in relation to the characters assessed in the field. Two criteria were formed from the classification of the most productive and resistant plants, and then used to select plants within the clusters. The selected plants displayed potential for the cacao improvement program, that they have a high production and high resistance to witches' broom.

Samana A.R.,UESC | Krmpotic F.,National University of La Plata | Paar N.,University of Zagreb | Bertulani C.A.,Texas A&M University-Commerce
Journal of Physics: Conference Series | Year: 2011

We extend our formalism of weak interaction processes, obtaining new expressions for the transition rates, which greatly facilitate numerical calculations, of neutrino (ν) and antineutrino (ν)-nucleus reactions and the muon capture. We have done a thorough study of exclusive (ground state) properties of 12B and 12N within the Projected Quasiparticle Random Phase Approximation (PQRPA). Good agreement with experimental data is achieved in this way. The inclusive ν/ν-nucleus reactions 12C(ν, e-)12N and 12C(ν, e+)12B are calculated within both the PQRPA, and the Relativistic QRPA (RQRPA). It is found that the magnitudes of the resulting cross-sections: i) are close to the sum-rule limit at low energy, but significantly smaller than this limit at high energies both for ν and ν, ii) steadily increase when the size of the configuration space is augmented, and particulary for ν/ν energies > 200 MeV, and iii) converge for sufficiently large configuration spaces and final state angular momenta.

Menezes A.A.,State University of Santa Cruz | Dias L.E.,Federal University of Vicosa | Neves J.C.L.,Federal University of Vicosa | da Silva J.V.O.,UESC
Revista Brasileira de Ciencia do Solo | Year: 2010

In Brazil, plant-available Zn in the soil is determined by several chemical procedures, of which the most commonly used are Mehlich-1 and DTPA. The objective of this study was to evaluate Zn availability in soils of Minas Gerais State, under different Zn and lime rates, using the extractors Mehlich-1, Mehlich-3 and DTPA and maize as indicator plant. Seven soil samples were incubated with lime to reach pH 6.0. The samples were treated with Zn in the form of ZnSO4, in the absence or presence of lime, and with a basic Zn-free fertilization of macro and micronutrients. Fifteen days after fertilization, sub-samples were collected for Zn determination by the extractors. For Mehlich-1 the extract was obtained by two procedures: filtering soon after extraction (M-1f) and aliquot withdrawal from the supernatant after 16 h (M-1s). The remaining soil was filled into plastic pots for maize cultivation during 50 days. The extraction capacity diminished in the following order: M-1s > M-1f > M-3 > DTPA, in all soils, with or without liming. M-1s and M-3 did not differ in extraction capacity in limed soil, whereas M-1f and DTPA were sensitive to liming. The Zn concentration values obtained with all extractors were negative and significantly correlated with clay content and soil water field capacity, with or without liming. The extraction capacity of DTPA was better correlated with soil properties in the presence of lime, indicating that the response of this extractor is better in higher-pH soils. All extractors were correlated with plant Zn content, and can therefore be used in the evaluation of soil Zn availability.

Discover hidden collaborations