6,324 research outputs found
Avaliação sensorial de cebolinha (Allium cepa, L.) orgânica para conserva.
bitstream/CPACT-2009-09/11943/1/documento_233.pd
Coherent imaging of a pure phase object with classical incoherent light
By using the ghost imaging technique, we experimentally demonstrate the
reconstruction of the diffraction pattern of a {\em pure phase} object by using
the classical correlation of incoherent thermal light split on a beam splitter.
The results once again underline that entanglement is not a necessary feature
of ghost imaging. The light we use is spatially highly incoherent with respect
to the object (m speckle size) and is produced by a
pseudo-thermal source relying on the principle of near-field scattering. We
show that in these conditions no information on the phase object can be
retrieved by only measuring the light that passed through it, neither in a
direct measurement nor in a Hanbury Brown-Twiss (HBT) scheme. In general, we
show a remarkable complementarity between ghost imaging and the HBT scheme when
dealing with a phase object.Comment: 13 pages, 11 figures. Published in Physical Review A. Replaced
version fixes some problems with Figs. 1, 4 and 1
Maturação de tubérculos da cultivar de batata BRS Ana.
bitstream/item/82142/1/Boletim-166-1.pd
Evaluation of Brix Refractometry to Estimate Immunoglobulin G Content in Buffalo Colostrum and Neonatal Calf Serum
Brix refractometry has been widely demonstrated to be a useful tool for monitoring
colostrum management program and passive immunity transfer (PIT) in Bovines, but its suitability
has never been verified in Buffalo. Therefore, the objective of this study was to evaluate the utility
of a simple and rapid tool such as a digital Brix refractometer to estimate colostrum quality and
for evaluating the success of passive transfer of immunoglobulin G (IgG) in Buffalo calves. The
optimal cut points levels for Brix Refractometry for distinguishing good- and poor-quality colostrum
and for assessing the adequacy of passive immunity transfer in calves were determined. For this
aim, 26 first-milking maternal colostrum (MC) were collected from first-calf heifers. Blood samples
were obtained from their calves at birth (T0) and 72 hours after (T3). Colostrum and Serum IgG
content were determined by indirect enzyme-linked immunosorbent assay (ELISA), whereas total
protein (TP, g/dL) and percentage Brix (%Brix) by means of a digital Brix refractometer. The mean
colostrum IgG was 64.9 ± 29.3 mg/mL. The mean serum %Brix at T3 was 9.6 ± 0.9%. The mean
serum IgG content at T3 was 11.1 ± 2.0 mg/mL. Pearson’s correlation coefficient (rp) was determined
between Brix and ELISA measurements: colostrum %Brix showed a significant correlation with
serum %Brix (rp = 0.82, p < 0.001); serum %Brix was highly correlated with serum TP (STP, g/dL)
(rp = 0.98, p < 0.001) and serum IgG (mg/mL) (rp = 0.85, p < 0.001). A cut point of 18% Brix to estimate
samples of MC ≥ 50 mg/mL from first-calf heifers was more appropriate for the buffalo. A cut point
of 8.4% Brix resulted in the greatest percentage of calf serum samples being correctly classified. Based
on our findings, a digital Brix refractometer could be a useful tool to monitor colostrum quality and
to estimate PIT in Buffalo calves
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