Silicon alleviates the toxicity of cadmium and zinc for maize (Zea mays L.) grown on a contaminated soil     

Karina Patrícia Vieira da Cunha  Clístenes Williams Araújo do Nascimento  Airon José da Silva 《植物养料与土壤学杂志》2008,171(6):849-853

Although silicon (Si) is not an essential element, it presents a close relationship with the alleviation of heavy‐metal toxicity to plants. This work was carried out to evaluate the effects of Si application to soil on the amelioration of metal stress to maize grown on a contaminated soil amended with Si (0, 50, 100, 150, and 200 mg kg^–1) as calcium silicate (CaSiO₃). Additionally, the cadmium (Cd) and zinc (Zn) bioavailability as well as their distribution into soil fractions was also studied. The results showed that adding Si to a Cd‐ and Zn‐contaminated soil effectively diminished the metal stress and resulted in biomass increase in comparison to metal‐contaminated soil not treated with Si. This relied on Cd and Zn immobilization in soil rather than on the increase of soil pH driven by calcium silicate application. Silicon altered the Cd and Zn distribution in soil fractions, decreasing the most bioavailable pools and increasing the allocation of metals into more stable fractions such as organic matter and crystalline iron oxides.  相似文献   

Molecular detection of Anaplasma platys and Ehrlichia canis in dogs from the North of Portugal     

Luís Cardoso  Joana Tuna  Lisete Vieira  Yael Yisaschar-Mekuzas  Gad Baneth 《Veterinary journal (London, England : 1997)》2010,183(2):232-233

Tick-transmitted rickettsial pathogens belonging to the Ehrlichia and Anaplasma genera can infect dogs and humans. In this study, four dogs from the North of Portugal, in which an ehrlichial disease was suspected clinically, were tested by molecular methods. After DNA extraction from blood on filter paper, a 345 bp fragment of the Ehrlichia/Anaplasma 16S rRNA gene was amplified by the polymerase chain reaction (PCR). Sequence analysis of PCR products revealed one dog infected with Ehrlichia canis and three with Anaplasma platys. One of these latter animals was co-infected with Babesia canis subspecies vogeli. This is the first report of the genetic characterisation of both A. platys and E. canis in naturally infected dogs from the North of Portugal.  相似文献   

Cutaneous mycoflora and CD4:CD8 ratio of cats infected with feline immunodeficiency virus     

Archivaldo Reche  Alexandre G.T. Daniel  Telma C.P. Lazaro Strauss  Carlos P. Taborda  Shirlei A. Vieira Marques  Kátia Haipek  Lilian J. Oliveira  Janaína M. Monteiro  José R. Kfoury 《Journal of Feline Medicine and Surgery》2010,12(4):355-358

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High?throughput phenotyping of two plant?size traits of Eucalyptus species using neural networks     

Marcus Vinicius Vieira Borges  Janielle de Oliveira Garcia  Tays Silva Batista  Alexsandra Nogueira Martins Silva  Fabio Henrique Rojo Baio  Carlos Ant?nio da Silva Junior  Gileno Brito de Azevedo  Glauce Taís de Oliveira Sousa Azevedo  Larissa Pereira Ribeiro Teodoro  Paulo Eduardo Teodoro 《林业研究》2022,(2):591-599

In forest modeling to estimate the volume of wood, artificial intelligence has been shown to be quite effi-cient, especially using artificial neural networks (A...  相似文献   

The occurrence of wild cotton <Emphasis Type="Italic">Gossypium mustelinum</Emphasis> Miers ex Watt populations in the coast of Pernambuco,Northeastern Brazil     

Edson Ferreira da Silva  Luiz Sergio Costa Duarte Filho  Ana Kelly dos Santos Maia  Allison Vieira da Silva  Ana Carolina Borges Lins e Silva 《Genetic Resources and Crop Evolution》2018,65(6):1551-1557

In this study, we describe three populations of the wild cotton Gossypium mustelinum Miers ex Watt in the coastal plain to the north of the State of Pernambuco, Northeast Brazil. These populations occur in urban areas in current expansion and under imminent risks of extinction, due to land use changes for house constructions. Distances between these new occurrences and the populations already mapped in the Northeast semiarid Caatinga (Rio Grande do Norte, Ceará, and Bahia) range from approximately 270–950 km. Besides distant, the populations on the coastal plain of Pernambuco also occur in very distinct climatic and edaphic conditions. Aiming at allowing the ex situ conservation of these genetic resources, branches of 66 plants were collected, propagated by the asexual breeding method cutting to regenerate an accession of each plant. These now constitute a germplasm collection in the Department of Agronomy of the Federal Rural University of Pernambuco (UFRPE), in Recife, Pernambuco, Brazil.  相似文献   

Fixed‐time post‐cervical artificial insemination in weaned sows following buserelin use combined with/without eCG          下载免费PDF全文

E Baroncello  ML Bernardi  AD Kummer  I Wentz  FP Bortolozzo 《Reproduction in domestic animals》2017,52(1):76-82

Fixed‐time post‐cervical artificial insemination (FTAI) drastically reduces labour requirements and increases the use of boars with higher genetic merit. This study evaluated the efficiency of eCG administration combined with/without the GnRH agonist buserelin for the induction and synchronization of ovulation in weaned sows submitted to FTAI. The sows were allocated into three groups. In the control group, the first artificial insemination was performed at the onset of oestrus and repeated every 24 hr. In the eCG+GnRH group, sows received 600 IU eCG at weaning and buserelin (10 μg) after 86–89 hr of eCG, and in the GnRH group, sows received only buserelin after 86–89 hr of weaning. The hormone‐treated sows received a single FTAI after 30–33 hr of buserelin application. All the sows were inseminated with homospermic doses (1.5 × 10⁹ sperm cells/50 ml). The interval between weaning and ovulation was shorter (p < .05) in the eCG+GnRH (133.3 hr) and GnRH (135.9 hr) groups than the control (141.5 hr) group. In the eCG+GnRH group, the sows ovulated earlier (p < .05) than those in the GnRH group (44.5 vs. 48.2 hr after buserelin administration). The reproductive performance of GnRH sows was not compromised when only sows exhibiting oestrus at the time of insemination were considered, but lower farrowing rate and smaller litter size were observed in eCG+GnRH sows. The reproductive performance of eCG+GnRH sows was primarily compromised because the insemination was performed outside the optimal time relative to ovulation; therefore, it is advisable to inseminate them before 116–122 hr after weaning.  相似文献   

Control of <Emphasis Type="Italic">Haemonchus contortus</Emphasis> in sheep using basidiocarps of <Emphasis Type="Italic">Agaricus blazei</Emphasis> Murril     

Thallyta Maria Vieira  Leydiana Duarte Fonseca  Gabriela Almeida Bastos  Viviane de Oliveira Vasconcelos  Maria Luíza França Silva  Franciellen Morais-Costa  Adriano Vinícius de Paiva Ferreira  Neide Judith Faria de Oliveira  Eduardo Robson Duarte 《Veterinary research communications》2017,41(2):99-106

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Reproductive performance of postpartum ewes treated with insulin or progesterone hormones in association with ram effect          下载免费PDF全文

JC Ferreira‐Silva  SRL Basto  F Tenório Filho  MT Moura  ML Silva Filho  MAL Oliveira 《Reproduction in domestic animals》2017,52(4):610-616

The reproductive performance of postpartum Santa Inês (SI) and Morada Nova (MN) ewes treated with insulin or progesterone hormones in association with ram effect was evaluated. Ewes from SI (n = 69) and MN (n = 69) breeds were randomly allocated to three groups of each breed (T1—ram effect only; T2—ram effect + insulin; T3—ram effect + progesterone). Progesterone concentrations (ηg/ml; mean ± SD) before and after introduction of rams (n = 6) were 0.51 ± 0.22 and 3.78 ± 0.68 (T1), 0.65 ± 0.21 and 3.77 ± 0.78 (T2) and 0.52 ± 0.21 and 3.84 ± 0.84 (T3) in SI ewes and 0.74 ± 0.19 and 3.71 ± 0.56 (T1), 0.70 ± 0.21 and 3.79 ± 0.75 (T2) and 0.81 ± 0.14 and 3.87 ± 0.80 (T3) in MN ewes, respectively. Thus, lower progesterone concentrations were found before the introduction of rams (p < .05). After the introduction of rams, preovulatory peaks of LH (ηg/ml) occurred at 28 (T1), 44 (T2) and 48 (T3) hr in SI ewes and at 64 (T1), 40 (T2) and 44 (T3) hr in MN ewes. The mean number of ovulations was similar between groups (p > .05), was 1.3 ± 0.51 (T1), 1.5 ± 0.54 (T2) and 1.6 ± 0.51 (T3) in SI ewes and 1.3 ± 0.51 (T1), 1.6 ± 0.51 (T2) and 1.6 ± 0.51 (T3) in MN ewes. In conclusion, the ram effect alone is effective at inducing and synchronizing oestrus in sheep under postpartum anoestrus, irrespective of hormone treatments.  相似文献   

Production of Energy and Biofertilizer from Cattle Wastewater in Farms with Intensive Cattle Breeding     

Henrique Vieira de Mendonça  Jean Pierre Henry Balbaud Ometto  Marcelo Henrique Otenio 《Water, air, and soil pollution》2017,228(2):72

This study evaluates the treatment efficacy and biogas yield of an integrated system composed of a plug-flow biodigester (with sludge recirculation) followed by polishing in a stabilization pond. The system was operated in real scale for 12 months at ambient temperature and under continuous flow. The volumetric yields of biogas varied according to the organic loads applied, between 114 and 294 Kg COD day^?1, reaching levels of 0.026 to 0.173 m³ m^?3 day^?1, with concentrations of CH₄ between 56 and 70%. The monthly biogas productions were between 378.5 and 2186.1 m³ month^?1 equal to an energy potential of approximately 2070 to 19,168 KWh month^?1.The average yearly removals of BOD_5,20 and COD by the integrated treatment system were 70 and 86%, respectively. The average annual removals of NH₄ and TKN were 88.5 and 85.5%, respectively. The pH values were always near neutral, and the alkalinity was in ranges propitious for anaerobic digestion. The results of this study indicate good efficacy in terms of removal of organic matter and nitrogen compounds, with the added benefits of generation of energy and use of the treated effluent as biofertilizer, enabling significant cost reductions to cattle farmers.  相似文献   

Search for sources of wide-spectrum resistance to Fusarium oxysporum f. sp. basilici isolates in accessions of Ocimum species     

A. Reis  L. S. Boiteux  R. F. Vieira 《Journal of General Plant Pathology》2008,74(5):375-381

Ocimum (Lamiaceae) is an important plant genus, with many species used for food flavorings and for essential oils. Fusarium wilt (Fusarium oxysporum f. sp. basilici, FOB) is the most important disease of basil (O. basilicum L.). Twenty-five accessions of O. basilicum, five of O. americanum and two of O. campechianum were initially evaluated for resistance to one FOB isolate (named as FOB-1). Eight accessions (identified as resistant to FOB-1) and one susceptible control were reevaluated to FOB-1 and four other FOB isolates of distinct geographic origins. The FOB isolates varied in aggressiveness and interacted differentially with the Ocimum accessions. Two accessions of O. americanum, one of O. campechianum, and one of O. basilicum had high levels of resistance to all five FOB isolates. The Ocimum germplasm identified here could represent useful sources of resistance genes for developing cultivars with wide-spectrum resistance (i.e., effective against a broad range of FOB isolates). In addition, having a set of potential differential accessions might be useful for large-scale analysis of FOB isolates to demonstrate the presence of physiological races in the Ocimum–FOB pathosystem.  相似文献