排序方式： 共有23条查询结果，搜索用时 15 毫秒
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Sammy Ramirez DVM MS Steven A. Sedrish DVM MS Dale L. Paccamonti DVM MS Dennis D. French DVM MS 《Veterinary radiology & ultrasound》1999,40(2):165-168
This report describes two mares presented for evaluation of anorexia, fever of unknown origin, and weight loss. Clinical examination, laboratory findings, and transrectal ultrasonographic images suggested ovarian abscessation. One mare was successfully treated medically. Because of financial considerations, the second mare was euthanatized and a postmortem examination was performed. At necropsy, there was an enlarged right ovary with an adhesion to the large colon. Microscopic findings were characteristic of an ovarian abscess. 相似文献
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Anurag Dagar Dina Zilberg Zvi Cohen Sammy Boussiba & Inna Khozin-Goldberg 《Aquaculture Research》2010,41(2):267-277
Two trials were conducted to determine the effects of dietary enrichments with the microalga Parietochloris incisa , rich in arachidonic acid (ARA), on stress resistance in guppies Poecilia reticulata . The microalga was added to commercial diets as a neutral lipid (NL) extract and its fractions or as broken cells. Experimental diets were applied for a period of 14 days. In trial 1, commercial diets were supplemented with NL (containing 25 mg ARA and 0.11 mg β-carotene g−1 feed), its triacylglycerol (TAG) fraction (containing 25 mg ARA g−1 feed and no β-carotene) and the β-carotene fraction (containing 0.11 mg carotenoid g−1 feed and minute amounts of ARA). Neutral lipid-fed fish demonstrated the highest resistance ( P <0.05) to osmotic stress (32-ppt NaCl), followed by fish fed with diets supplemented with TAG and β-carotene alone, which were more resistant than control ( P <0.05). In trial 2, fish fed diets supplemented with higher levels of broken alga (26.1 mg ARA g−1 feed) were more resistant ( P <0.05) to stress as compared with fish fed lower ARA (16.3 mg g g−1 ) or an unsupplemented control diet. We suggest a dietary supplementation with broken P. incisa cells to enhance stress resistance in guppies before a stressful event. 相似文献
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In this paper, a new method to fuse low resolution multispectral and high resolution RGB images is introduced, in order to detect Gramineae weed in rice fields with plants at 50 days after emergence (DAE).The images are taken from a fixed-wing unmanned aerial vehicle (UAV) at 60 and 70 m altitude. The proposed method combines the texture information given by a high resolution red–green–blue (RGB) image and the reflectance information given by a low resolution multispectral (MS) image, to obtain a fused RGB-MS image with better weed discrimination features. After analyzing the normalized difference vegetation index (NDVI) and normalized green red difference index (NGRDI) for weed detection, it was found that NGRDI presents better features. The fusion method consists of decomposing the RGB image using the intensity, hue and saturation (IHS) transformation, then, a second order Haar wavelet transformation is applied to the intensity layer (I) and the NGRDI image. From this transformation, the low–low (LL) coefficients of the NGRDI image are replaced by the LL coefficients of the I layer. Finally, the fused image is obtained by transforming the new wavelet coefficients to RGB space. To test the method, a one hectare experimental plot with rice plants at 50 DAE with Gramineae weeds was selected. Additionally, to compare the performance of the method, two indices were used, specifically, the M/MGT index which is the percentage of detected weed area, and the MP index which indicates the precision of weed detection. These indices were evaluated in four validation zones using three Neural Networks (NN) detection systems based on three types of images; namely, RGB, RGB + NGRDI, and fused RGB-NGRDI. The best weed detection performance was obtained by the NN with the fused image, with M/MGT index between 80 and 108% and MP between 70 and 85%. 相似文献
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Disaster damage levels are matched to county‐level nonprofit activity indicators. Using dynamic panel‐data estimation, nonprofit net assets (and nonprofit revenue to a lesser extent) defined at this local level are found to be positively correlated with disaster event damage levels, consistent with a post‐disaster giving mechanism. Magnitudes are relatively small, suggesting a distributed downstream flow of benefits to local nonprofits from larger national organizations. Furthermore, disaster damage at a lag is associated with only minor increases in the count of local nonprofit organizations at the county level. The relative impacts of assets and nonprofit counts in particular indicate that existing nonprofits have the established credibility and networks to be reliable conduits for post‐disaster asset flows. If local nonprofits are an indicator of regional social capital, the findings suggest that disasters reveal the resilience of social capital structures in the face of crisis along the focal dimension of nonprofit activity. 相似文献
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Ling-Yun Chang Sajjad Toghiani Ashley Ling El H. Hay Sammy E. Aggrey Romdhane Rekaya 《Journal of Agricultural, Biological & Environmental Statistics》2017,22(4):640-651
Several discrete responses, such as health status, reproduction performance and meat quality, are routinely collected for several livestock species. These traits are often of binary or discrete nature. Genetic evaluation for these traits is frequently conducted using a single-trait threshold model, or they are considered continuous responses either in univariate or in multivariate context. Implementation of threshold models in the presence of several binary responses or a mixture of binary and continuous responses is far from simple. The complexity of such implementation is primarily due to the incomplete randomness of the residual (co)variance matrix. In the current study, a multiple binary trait simulation was carried out in order to implement and validate a new procedure for dealing with the consequences of the restrictions imposed to the residual variance using threshold models. Using three and eight binary responses, the proposed method was able to estimate all unknown parameters without any noticeable bias. In fact, for simulated residual correlations ranging from ?0.8 to 0.8, the resulting HPD 95% intervals included the true values in all cases. The proposed procedure involved limited additional computational cost and is straightforward to implement independent of the number of binary responses involved in the analysis. Monitoring of the convergence of the procedure must be conducted at the identifiable scale, and special care must be placed on the selection of the prior of the non-identifiable model. The latter could have serious consequences on the final results due to potential truncation of the parameter space. 相似文献
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【目的】从细胞学角度研究细胞自噬过程中膜结构细胞器的变化及其与自噬体发生的关系。【方法】以基因互作引起细胞调亡现象发生的水稻爪粳杂种F1和天然化合物印楝素、喜树碱、苦参碱诱导凋亡的昆虫细胞Sf9为材料,通过透射电子显微镜和荧光显微镜技术观察细胞自噬凋亡期间自噬体的特征。【结果】水稻杂种F1花粉母细胞在不同发育时期存在不同程度的退化,部分细胞内线粒体形态发生显著变化,形成长哑铃型或线管状,最后两端弯曲形成双层膜结构的细胞器;绒毡层细胞均出现内质网膨大,且逐渐包裹周围其它细胞器,如线粒体,形成双层膜结构的自噬体,最终引发细胞的自噬性凋亡。喜树碱和苦参碱诱发凋亡的细胞胞内线粒体形态发生拉长、弯曲,最后闭合形成包裹其它细胞器的双层膜结构自噬体;印楝素和喜树碱诱发凋亡的细胞胞内核通过分页和出芽的方式形成双层膜结构自噬体。【结论】动植物细胞自噬凋亡过程中,内质网、线粒体和细胞核3种膜结构细胞器均是自噬体膜结构的直接来源,然而3种膜结构细胞器参与自噬体形成的程度和方式因物种、细胞种类以及自噬诱发因素的变化而不同。 相似文献
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Sammy Ramirez DVM MS Jamie Williams MS DVM Thomas L. Seahorn DVM MS Uriel Blas-Machado DVM Beth Paugh Partington DVM MS Miguel Valdes DVM MS J. Raymond McClure DVM MS 《Veterinary radiology & ultrasound》1998,39(2):143-146
A 3-month-old foal was presented for correction of bilateral angular limb deformities. Azotemia was detected as an incidental finding. Small, misshapened, hyperechoic kidneys with decreased corticomedullary demarcation were noted with ultrasonography. Additionally, the internal renal architecture was abnormal in that the intrarenal vessels and distant collecting system were not clearly seen in either kidney. Ultrasound-guided renal biopsy was suggestive of congenital renal dysplasia, which was later confirmed at necropsy. Clinical, sonographic, and pathologic features of equine renal dysplasia are discussed. 相似文献