1,685 research outputs found
Improvement of flowering in Calceolaria by cold treatment and selection.
Cold treatment for 4 weeks at 10 deg C resulted in shortening of the uneven flowering period as a consequence of a delay of the early-flowering and an advance of the late-flowering plants. For the selection material used, the effect was notably a delay of the early-flowering plants. The percentage of flowering plants was favourably influenced by cold treatment. The number of simultaneously flowering plants was also increased by selection, although to a lesser extent. (Abstract retrieved from CAB Abstracts by CABI’s permission
Broadband hyperspectral imaging for breast tumor detection using spectral and spatial information
Complete tumor removal during breast-conserving surgery remains challenging due to the lack of optimal intraoperative margin assessment techniques. Here, we use hyperspectral imaging for tumor detection in fresh breast tissue. We evaluated different wavelength ranges and two classification algorithms; a pixel-wise classification algorithm and a convolutional neural network that combines spectral and spatial information. The highest classification performance was obtained using the full wavelength range (450-1650nm). Adding spatial information mainly improved the differentiation of tissue classes within the malignant and healthy classes. High sensitivity and specificity were accomplished, which offers potential for hyperspectral imaging as a margin assessment technique to improve surgical outcome. (C) 2019 Optical Society of America under the terms of the OSA Open Access Publishing Agreemen
Method for coregistration of optical measurements of breast tissue with histopathology : the importance of accounting for tissue deformations
For the validation of optical diagnostic technologies, experimental results need to be benchmarked against the gold standard. Currently, the gold standard for tissue characterization is assessment of hematoxylin and eosin (H&E)-stained sections by a pathologist. When processing tissue into H&E sections, the shape of the tissue deforms with respect to the initial shape when it was optically measured. We demonstrate the importance of accounting for these tissue deformations when correlating optical measurement with routinely acquired histopathology. We propose a method to register the tissue in the H&E sections to the optical measurements, which corrects for these tissue deformations. We compare the registered H&E sections to H&E sections that were registered with an algorithm that does not account for tissue deformations by evaluating both the shape and the composition of the tissue and using microcomputer tomography data as an independent measure. The proposed method, which did account for tissue deformations, was more accurate than the method that did not account for tissue deformations. These results emphasize the need for a registration method that accounts for tissue deformations, such as the method presented in this study, which can aid in validating optical techniques for clinical use. (C) The Authors. Published by SPIE under a Creative Commons Attribution 4.0 Unported License
Premi Asuransi Jiwa Gabungan Berjangka dengan Asumsi Gompertz
This article discusses the annual premium of term insurance for joint life. In this kind of insurance, the sum assured of two people insured with the age of and is paid if only one of the insureds dies during the coverage period and then no more premium payment. The annual premium is affected by single premium and present value of annuity due, where Gompertz assumption is used in calculation. A bigger premium is obtained using the Gompertz assumption
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