Bolsista de Iniciacao Cientifica
Bolsista de Iniciacao Cientifica
Reis M.R.,Federal University of Viçosa |
Leao E.U.,São Paulo State University |
Santos G.R.,Federal University of Tocantins |
Sarmento-Brum R.B.C.,UFT Gurupi |
And 3 more authors.
Planta Daninha | Year: 2013
The use of microorganisms is an alternative for the control of plant diseases. However, one should verify its interaction with other methods of control used for a particular crop. The objective of this work was to evaluate the effect of herbicide fungitoxicity on the growth and development of Trichoderma spp. strains. A completely randomized design was used in a factorial scheme 6 x 6 x 4, with four replications. Factor A consisted of the herbicides pendimethalin, clomazone, carfentrazone-ethyl, oxadiazon, thiobencarb + propanyl and byspiribac-sodium; factor B consisted of the herbicides doses 0, 25, 50, 75, 100, and 200% of the recommended dose; and factor C consisted of the Trichoderma spp. strains AJAM 18, CE 66, TRI 01, and TRI 02. The assay was conducted under in vitro conditions, with radial mycelial growth (RMG) and strain sporulation being evaluated after application of the herbicides. A difference was observed in the sensitivity of the strains for the same product tested. Oxadiazon reduced the RMG of the isolates AJAM 18 and TRI 01 in 66% and 35%, respectively. However, it reduced only 16% of the RMG of the isolate TRI 02, and it did not affect the RMG of the isolate CE 66, even when at 200% of the recommended dose. Different effects of the products were verified on each isolate. The commercial mixture thiobencarb+propanyl was highly toxic to the isolates with reduction of the RMG and in the number of spores around 85%. On the other hand, byspiribac-sodium had a little effect on the strains with less than 10% reduction in the RMG and sporulation. Carfentrazone-ethyl and byspiribac-sodium were found to be compatible with the isolates of Trichoderma spp. evaluated.
Filho J.F.,UEPB EMEPA |
Beltrao N.E.M.,Embrapa Algodao |
Pereira A.S.,Bolsista de Iniciacao Cientifica
Revista Brasileira de Engenharia Agricola e Ambiental | Year: 2010
The objective of this research was to develop and validate a ruler that measures the leaf area of the cotton plant, in a quick and non-destructive manner and directly in the field. Ninety days after the emergence of the crop, leaf samples of tencotton plants of cultivar BRS 187 8H were collected, of which all leaves were removed to prepare the samples and, after that, they were photocopied and length measurements were done with the help of a planimeter to define the range of the ruler. In the second stage of the experiment, the cultivars BRS Safira, BRS 201 and BRS Verde were used to test the ruler. The analysis of regression between the leaf area measured in samples of leaves and the estimated areas showed a good adjustment with coefficient of determination equal to 0.95. Comparing the means of both the methods, it was verified that the mean leaf area of the four cultivars of cotton, measured with the proposed ruler, did not differ statistically from the mean area measured with the planimeter. The ruler can be recommended to determine, directly in the field, the leaf area of cotton cultivars with cordiform and planofile leaf structure, in relation to the horizontal.
Teixeira F.A.,State University of Southwest Bahia |
Bonomo P.,State University of Southwest Bahia |
Pires A.J.V.,State University of Southwest Bahia |
da Silva F.F.,State University of Southwest Bahia |
And 2 more authors.
Revista Brasileira de Zootecnia | Year: 2011
This study was conducted to evaluate the displacement and permanency patterns of grazing cattle on Brachiaria decumbens deferred during 95 days under four strategies of nitrogen application (0-0, 0-100, 50-50, 100-0 kg N.ha-1), at the beginning and at the end of the rainy season. During the deferred period, in the dry season, forage yield, canopy structural characteristics, and displacement pattern were evaluated. Four steers were used in Ten grazing tests of 45 minutes and 14 heifers Girolanda, monitored every 10 minutes during 24 hours, were used to evaluate the permanency time. Pastures fertilized with 100 kg N at the end of the rainy season had higher herbage and leaf blade, sward surface height, extended leaf height, sward leaf blade bulk density and stem mass in all canopy layers. The lodging rates were higher for pastures fertilized at the end of the rainy season (0-100 and 50-50). More feeding stations and steps per minute were found in 0-100 and 50-50 fertilization strategies, due to greater difficulty in forage selection with higher degree of lodging. On the other hand, the numbers of bites per feeding station and per minute were lower for these strategies. The permanency time was greater on pastures where the fertilization was 100 kg N.ha-1 at the end of the rainy season (0-100). Fertilization close to sealing period modify the displacement pattern of animals because the higher plants lodging making the animals to spend more time on pasture with greater density of leaf blade. © 2011 Sociedade Brasileira de Zootecnia.
de Oliveira F.M.,Unicentro |
Lopes E.S.,Unicentro |
Malinovski J.R.,Federal University of Paraná |
da Silva R.H.,Bolsista de Iniciacao Cientifica |
Rodrigues C.K.,Bolsista de Iniciacao Cientifica
Floresta | Year: 2012
The objective of this research was to conduct technical and cost analysis of pruning in Pinus taeda L. planted forests by semi-mechanized and manual methods to increase productivity, improve the quality and reduction of costs. The research was conducted in a forest service company, located in the State of Parana, Brazil. There was studied the pruning to 2.5 m, 4.0 m and 5.0 m high. The technical evaluation consisted of a time and motion study, determining the productivity, operational efficiency and the quality of activities verifying the presence of branch stumps and injuries in the wood. The cost analysis was done by determining operating and production costs.The results showed that manual pruning had lower productivity compared to the semi-mechanized method, provided even better quality of work over terms apparent injuries on wood. Though even higher production cost, the implementation of pruning higher by semi-mechanized methods becomes more technical and economically, caused by better quality work in relation to the branch stumps and possible ergonomics benefits to workers.
de Souza E.,Federal University of Rio Grande do Norte |
de Souza L.F.N.,Bolsista de Iniciacao Cientifica |
da Costa Batista M.,Bolsista de Iniciacao Cientifica |
Rodrigueses J.A.M.,Bolsista de Iniciacao Cientifica |
And 3 more authors.
Revista Brasileira de Ginecologia e Obstetricia | Year: 2010
PURPOSE: to assess the helicoid biopsy performance when carrying out breast biopsies. METHODS: thirty patients with breast cancer submitted to mastectomy were selected at random. Women with a tumor of petreous consistency, nonpalpable, submitted to previous surgical manipulation or containing fluid were excluded. The helicoid biopsy kit and a core biopsy device with a cannula and a 14-gauge-needle, respectively, were used to collect a fragment each from a healthy area and from the tumor of each surgical specimen, for a total of 120 fragments for histological study. Data were analyzed statistically by the parametric Student's t-test and by the Kappa concordance index at the 95% confidence level, using the SPSS software, version 13. RESULTS: the mean patient's age was 51.6 (±11.1) years old. The core biopsy showed 93.3% sensitivity, 100% specificity and 96.7% accuracy, and the helicoid biopsy showed 96.7% sensitivity, 100% specificity, and 98.3% accuracy. The comparison of tumor histology and biopsy fragments revealed a high degree of concordance in the diagnoses (Kappa equal to 0.9, with p<0.05). CONCLUSIONS: both methods provided a highly accurate histological diagnosis of the lesions. The results of the present study demonstrate that the helicoid biopsy is a reliable alternative for the preoperative diagnosis of breast lesions.
PubMed | Bolsista de Iniciacao Cientifica
Type: Journal Article | Journal: Revista da Sociedade Brasileira de Medicina Tropical | Year: 2010
A retrospective study was conducted in order to assess the prevalence and factors associated with seropositivity for HTLV-1/2 between 1995 and 2008 in Uberaba Regional Blood Center, and to describe the seropositive blood donors in relation to gender, age, marital status, skin color and origin.Descriptive statistical analysis, chi-square tests and odds ratios were produced to compare proportions, along with scatter charts with linear correlation coefficients.Among the donors tested, the prevalence of seropositivity for HTLV was found to be 0.02%, with indeterminate results in 0.09%. There was a significant reduction in seropositivity for HTLV between 2002 and 2008, compared with the period from 1995 to 2001. Among the seropositive individuals, females were significantly predominant.The gradual decrease in seropositivity over this period was attributed to the permanent exclusion of seropositive repeat donors and improvement in the clinical screening methods and serological tests over the years, with a positive impact on transfusion safety.