Zonal dermal separation: a distinctive histopathological lesion associated with hyperelastosis cutis in a Quarter Horse   总被引：2，自引：1，他引：1  

Brounts SH  Rashmir-Raven AM  Black SS 《Veterinary dermatology》2001,12(4):219-224

This case report describes a distinctive deep cutaneous lesion in a 1-year-old Quarter Horse filly with hyperelastosis cutis. The horse had a typical clinical presentation of hyperelastic skin associated with a 6-month history of cutaneous wounds that developed following minor cutaneous trauma. Punch biopsies of skin from the affected horse were thinner than similar biopsies from an age- and breed-matched control. Significant microscopic lesions were not seen in cutaneous punch biopsies stained with haematoxylin and eosin and Masson's trichrome stains, but the ultrastructure of the dermis from the affected horse was characterized by variation in collagen fibre diameter and loose packing of collagen fibres within bundles. The horse was euthanized and necropsied, and full-thickness sections of skin were collected and examined microscopically. Affected skin was of normal thickness; however, the deep dermis contained a distinctive horizontal linear zone in which separation of collagen bundles resulted in the formation of large empty cleft-like spaces between the upper and lower regions of the deep dermis. We suggest the term 'zonal dermal separation' for this microscopic lesion. Incisional full-thickness skin biopsies should be taken in suspected cases of equine hyperelastosis cutis because punch biopsies may not obtain enough deep dermis to adequately represent pathological change in the skin of horses with this disorder.  相似文献   

胸腺素α_1对墟岗黄鸡免疫器官组织学结构的影响   总被引：4，自引：0，他引：4  

陈芳  计慧琴  卢玉葵  王丙云  江青艳 《中国畜牧杂志》2005,41(7):16-18

本试验研究了不同剂量的胸腺素α1(Tα1)对墟岗黄母鸡免疫器官指数和组织学结构的影响。结果表明:0.015mg/kg体重剂量的Tα1可显著提高鸡免疫器官指数,可使胸腺皮质增宽,髓质胸腺小体数和胸腺细胞数增加;脾脏胸腺依赖区和法氏囊依赖区细胞增殖;高剂量Tα1则引起法氏囊髓质局部细胞变性和坏死。  相似文献   

油菜品种抗蚜性多目标模糊综合决策   总被引：3，自引：0，他引：3  

侯有明  刘绍友  赵清华 《植物保护学报》1995,22(4):337-342

作者采用模糊统计回归法，建立了油菜品种的自然感蚜量、蚜虫在品种上的“累积存活率”，平均发育历期、平均产仔量、内禀增长率及品种耐害性、干扰效应等抗性指的模糊隶属函数，建立了品种抗蚜性的模糊综合决策模型。结果表明，１２个品种抗性强弱为：红叶芥＞咸阳７４－１＞甘油５号＞８８６３１＞７２１１＞７５－１＞波力木耳＞８８６３８＞德国１５选株＞华油９号＞秦油３号＞秦油２号。同时作者提出的一套衡量品种抗性的指禁  相似文献   

Characterizing the complexity of landscape boundaries by remote sensing   总被引：9，自引：0，他引：9  

Jean Paul Metzger  Etienne Muller 《Landscape Ecology》1996,11(2):65-77

This paper presents a method for characterizing the complexity of landscape boundaries by remote sensing. This characterization is supported by a new boundary typology, that takes into account points where three or more landcovers converge (i.e., convergency points or coverts). Landscape boundary richness and diversity indices were proposed and calculated over 19 landscapes in South-East Brazil. Results showed that landscape boundaries, especially convergency points, provided an enrichment in landscape pattern analysis. Landcover boundary diversities were significantly related to landcover shape: elongated riparian units had the highest values for boundary diversity and coverts proportion indices. On the other hand, landscape analysis showed that indices of shape, richness, diversity and coverts proportion provided an additional evaluation of landcover spatial distribution within the landscape.  相似文献   

DOPPLER SONOGRAPHIC EVALUATION OF THE DIGITAL BLOOD FLOW IN HORSES WITH LAMINITIS OR SEPTIC PODODERMATITIS     

SANTI WONGAUMNUAYKUL  CLAUDIA SIEDLER  HERMANN SCHOBESBERGER  CHRISTIAN STANEK 《Veterinary radiology & ultrasound》2006,47(2):199-205

The aim of this study was to evaluate the use of Doppler ultrasonography to monitor vascular blood flow dynamics in defined diseases of the equine digit in a noninvasive way. Doppler sonography was used to evaluate medial digital artery blood flow in eight horses with septic pododermatitis and four horses with laminitis in comparison with 10 horses of a control group. Doppler sonographic measurement and lameness examinations were performed in lame horses before treatment (day 0) and at 3, 6, and 9 days following treatment. Before treatment, blood flow velocities, arterial diameter, and flow volume were significantly higher in the lame horses, while pulsatility indices (PIs) were significantly lower (P < 0.05). Compared with the control group, there was no significant difference of resistive indices (RI) in the septic pododermatitis group, but these indices were significantly lower in the laminitis group. No significant difference between the two lame groups was recorded. After treatment, blood flow velocities and flow volume decreased significantly and PIs increased significantly in both lame groups, while RI and arterial diameter did not change. No correlation between Doppler parameters and the degree of lameness was found. Doppler sonography can be used to monitor vascular blood flow dynamics in horses suffering from septic pododermatitis and laminitis, while blood flow velocities and PI can serve as parameters for monitoring the course of the disease.  相似文献   

东北白鹅和籽鹅血液生化指标   总被引：5，自引：2，他引：5  

康波  杨焕民  刘胜军  周瑞进  李士泽  姜冬梅 《中国兽医学报》2006,26(6):649-652

为建立东北白鹅和籽鹅血液生化指标的正常参考值及其正常参考范围,探讨东北白鹅和籽鹅的各项血液生化指标之间的差异显著性,随机抽取(12±0.5)月龄健康、体质量为(4.2±0.2)kg的东北白鹅母鹅和(3.5±0.2)kg的籽鹅母鹅各65只,空腹12h后翅下静脉采血,离心分离血清,应用半自动生化分析仪及试剂盒对血清22项生化指标进行检测分析。结果表明:东北白鹅和籽鹅丙氨酸氨基转移酶(ALT/GPT)、天门冬氨酸氨基转移酶(AST/GOT)、谷氨酸酰基转移酶(GT)、胆碱脂酶(CHE)、乳酸脱氢酶(LDH-L)、葡萄糖(Glu)、高密度脂蛋白胆固醇(HDL-C)、总蛋白(TP)、白蛋白(Alb)、钙(Ca)、肌酐(Cre)、镁(Mg)等血清生化指标之间差异达到极显著水平(P<0.01);碱性磷酸酶(ALP)、总胆固醇(CHO)、无机磷(P)之间差异达到显著水平(P<0.05);a-羟丁酸脱氢酶(a-HBDH)、尿素氮(BuN)、甘油三脂(TG)、尿酸(UA)、总胆红素(T.Bili)、直接胆红素(D.Bili)、氯(Cl)之间无显著性差异(P>0.05)。本试验建立的东北白鹅和籽鹅血液生化指标的正常参考值及其正常参考范围,为今后鹅的相关研究提供了基础的科学数据和基本的理论依据。  相似文献   

TM影像VI提取植被信息技术研究   总被引：19，自引：1，他引：18  

高志海  魏怀东 《干旱区资源与环境》1998,12(3):98-104

应用规一化植被指数（ＮＤＶＩ）、土壤调节植被指数（ＳＡＶＩ）和修正后的土壤调节植被指数（ＭＳＡＶＩ）,研究了ＴＭ影像植被信息的提取技术。结果表明,ＳＡＶＩ较之ＮＤＶＩ和ＭＳＡＶＩ,消除土壤背景影响和适应植被密度变化的能力更强,是植被信息提取效果较好的植被指数。使用ＳＡＶＩ,关键是要确定一个合适的土壤调节参数Ｌ,以最大限度地消除土壤背景的影响,ＳＡＶＩ提出时推荐的最佳Ｌ值（０．５）应用于卫片处理有很大局限性;基于研究结果,本文给出了适于不同植被条件卫片处理的最佳Ｌ取值。  相似文献   

Soil Potassium Indices and Clay‐Sized Particles affecting Banana‐Wilt Expression Caused by Soil Fungus in Banana Plantation Development on Transported Volcanic Soils     

《Communications in Soil Science and Plant Analysis》2012,43(3-4):397-412

Abstract

Relations among the expression of banana disease symptoms caused by the soil fungus Fusarium oxysporum f. sp. cubense, soil potassium (K)–sodium (Na) properties [soluble K‐Na ratios (SK/SS), potential buffering capacity for K (KBC), potassium adsorption ratio (KAR)], and clay‐sized particles were evaluated in Sorribas plots from the Canary Islands. Soils were sampled in areas of Sorribas where banana plants show positive or negative wilting symptoms characteristic of Panama disease. The Bartoli method was used for soil dispersion (Na resin). This method was able to show a clear separation between diseased and disease‐free areas by the amount of clay‐sized particles. Results also show that the greatest SK/SS ratios and clay‐sized particles in soils from diseased areas could explain the increase of water‐stable aggregate mass in these soils and the release of available iron (Fe) to soil solution in diseased areas, at least in Sorribas cultivated soils under the arid climate conditions of the Canary Islands.  相似文献   

皂质芦荟细胞悬浮培养初探     

周晓鹿  李思良 《北方园艺》2008,16(2):188-192

试验初步研究了皂质芦荟细胞悬浮培养过程.比较了不同基本培养基、接种量对悬浮培养过程中细胞生长量的影响.采用正交设计方法,对影响皂质芦荟悬浮细胞生长的因素进行了优化研究.初步探讨了皂质芦荟在细胞生长周期里生理生化特性.结果表明:B5 培养基有利于细胞的增殖;每50 mL培养液中加入2 g愈伤组织的接种量为宜;筛选出最适激素组合为2,4-D 3.0mg/L KT0.5mg/L,葡萄糖25 g/LpH值5.8;皂质芦荟悬浮培养的生长周期为25 d,细胞增值率曲线呈S型;在悬浮细胞生长前期,pH值明显下降,在细胞对数生长期,pH值略有升高,并趋于平缓;总酚含量、POD、SOD均出现2个峰值,但出现时间不同,其变化趋势与细胞生长趋势呈正相关,PPO活性与细胞生长趋势呈负相关.  相似文献   

Mapping Ridolfia segetum patches in sunflower crop using remote sensing     

J M PEÑA-BARRAGÁN  F LÓPEZ-GRANADOS  M JURADO-EXPÓSITO  & L GARCÍA-TORRES 《Weed Research》2007,47(2):164-172

Ridolfia segetum is a frequent umbelliferous weed in sunflower crops in the Mediterranean basin. Field and remote sensing research was conducted in 2003 and 2004 over two naturally infested fields to determine the potential of multispectral imagery for discrimination and mapping of R. segetum patches in sunflower crops. The efficiency of the four wavebands blue (B), green (G), red (R) and near‐infrared (NIR), selected vegetation indices and the spectral angle mapper (SAM) classification method were studied using aerial photographs taken in the late vegetative (mid‐May), flowering (mid‐June) and senescence (mid‐July) crop growth stages. Discrimination efficiency of R. segetum patches in sunflower crops is consistently affected by their phenological stages, in this order: flowering > senescence > vegetative. In both fields, R. segetum patches were efficiently discriminated in mid‐June, corresponding to the flowering phase, by using the waveband G, the ratio R/B or SAM with overall accuracies ranging from 85% to 98%. The application of the median‐filtering algorithm to any of the classified images improved the accuracy. Our results suggest that mapping R. segetum weed patches in sunflower to implement site‐specific weed management techniques is feasible with aerial photography when images are taken from 8 to 10 weeks before harvesting.  相似文献