Caprine besnoitiosis: an emerging threat and its relationship to some other infections of ungulates by Besnoitia species     

A. Oryan  I.A. Silver  R. Sadoughifar 《Research in veterinary science》2014

Caprine besnoitiosis, caused by the cyst-forming protozoal apicomplexan Besnoitia caprae appears to be endemic in Kenya, Nigeria and Iran, but has yet to be detected in other parts of the world. The infection causes an important parasitic disease of goats in affected developing countries. Bovine besnoitiosis, is a widespread disease of cattle in Africa, Asia (but not Iran) and southern Europe. Recent epidemiological data confirm that the incidence and geographical range of bovine besnoitiosis in Europe is increasing, which is why growing attention has been given to the condition during the past decade. This paper reviews pertinent information on the biology, epidemiology, pathology, clinical signs, diagnosis and control of caprine besnoitiosis, together with its similarities to, and differences from, bovine besnoitiosis. The serious economic consequences of besnoitiosis on goat breeding and local meat and hide industries is also considered.  相似文献   

超高压对草鱼肌肉超微结构与质构特性的影响   总被引：3，自引：0，他引：3  

沈月新 《水产学报》1996,20(4):343-347

研究了等静超高压对草鱼肌肉超微结构与质构特性的影响，并与猪肌肉用对照。结果表明：１．加压处理的草鱼肌肉，其超微结构中出现较明显的变化，如肌原纤维中Ａ带和Ｉ带的细丝均被破坏，粗丝相互聚集，出现间隙，Ｚ线变粗，不连续，Ｈ带和Ｍ线消失等，但肌原纤维的外形仍保持完整。２加压处理的草鱼肌肉，其外观无显著变化，色泽稍白，略有汁液流出，但质构特性与处理前无明显差别。  相似文献   

Morphological studies of peripheral blood cells of the Chinese sturgeon, <Emphasis Type="Italic">Acipenser sinensis</Emphasis>     

Gao Zexia  Wang Weimin  Yang Yi  Khalid Abbas  Li Dapeng  Zou Guiwei  James S. Diana 《Fish physiology and biochemistry》2007,33(3):213-222

The peripheral blood cells of one-year-old Chinese sturgeon (Acipenser sinensis) have been studied by light microscopy and transmission electron microscopy. The erythrocyte count was 84.86 × 10⁴ cell mm⁻³ in the peripheral blood of the fish and that of leukocytes was 2.24 × 10⁴ cell mm⁻³. The erythrocytes and four main types of leucocyte—thrombocytes, lymphocytes, granulocytes (including neutrophils and eosinophils), and monocytes, were identified in the peripheral blood. In addition to normal erythrocytes, reticulocytes and division of erythrocytes were observed. Thrombocytes were the most numerous among the leukocytes, and the number of neutrophils with lobated nuclei was larger than for other fish. The structures of the erythrocytes, lymphocytes, monocytes, granulocytes, and thrombocytes of the fish were studied. The erythrocytes were almost completely devoid of organelles, except for some mitochondria and granules. A large number of vacuoles and a few organelles were observed in cytoplasm of the monocytes. There were many microvilli on the membrane and pseudopodia-like cytoplasm bulge in the lymphocytes. The neutrophils were round or oval in shape with bilobed, trilobed, or multilobed nuclei whereas the eosinophils had big special granules, dark stained. There were many vesicles in some thrombocytes, which were related to its phagocytosis; some thrombocytes had almost no cytoplasm or organelles.  相似文献   

西瓜花叶病毒对四倍体西瓜叶片细胞超微结构的影响   总被引：1，自引：0，他引：1  

朱红菊  路绪强  刘文革  赵胜杰  阎志红  何楠  豆峻岭  高磊 《中国瓜菜》2014,(3):14-16

为研究西瓜花叶病毒(WMV)对四倍体西瓜功能叶片细胞超微结构的影响,用透射电镜观察四倍体西瓜受WMV侵染后功能叶片细胞超微结构的变化。结果表明,WMV侵染四倍体西瓜后,四倍体西瓜叶片细胞叶绿体肿胀、片层模糊不清、叶绿体外膜产生异形增生物等;细胞内嗜锇颗粒增加,有大量的风轮状内含体出现,产生大量的束丝包裹病毒粒子;有高尔基体出现,线粒体数目增加,细胞核核膜部分边缘被破坏,核仁融解等。与正常四倍体西瓜叶片细胞相比,WMV对四倍体西瓜叶片细胞超微结构破坏严重,影响四倍体西瓜正常生长。  相似文献   

节节麦不同生育期叶片蜡质组成和超微形态的变化     

王艳婷  孙瑜琳  王美玲  汪勇  史雪  李春莲  权力  王中华  陈耀锋 《麦类作物学报》2014,34(11):1516-1521

为了解节节麦(Aegilops tauschii Coss.)不同生育期叶片表皮蜡质组成及晶体形态的变化,对节节麦叶片蜡质进行提取,利用气相色谱-质谱(GC-MS)联用仪和气相色谱-火焰离子化检测仪(GC-FID)对蜡质进行了定性和定量分析,并采用扫描电镜(SEM)对叶片表面蜡质晶体形态进行了观察。结果表明,节节麦叶表皮蜡质经GC-MS分析,共鉴定出化合物21种,主要以初级醇为主(苗期、抽穗期和灌浆期相对含量分别为85%、84%和70%),并含有少量的烷烃、醛、酮和脂肪酸;随着节节麦的生长发育,蜡质总量不断积累,烷烃含量极显著地升高,其中以C29烷烃的增加最明显,而初级醇含量显著降低,其中C26醇的相对含量降低最明显(苗期、抽穗期和灌浆期相对含量分别为80%、76%和63%),其他各类化合物组分变化不大。经扫描电镜观察,节节麦叶片近轴和远轴面的蜡质晶体形态无明显差别,苗期均为片状,抽穗期大部分仍以片状形态存在,并且蜡质晶体的密集程度比苗期稀疏,灌浆期蜡质晶体的密集程度变得更加稀疏。这些变化可能与抽穗期、灌浆期烷烃含量的增加和初级醇含量的减少有关。  相似文献   

花曲柳木材细胞腔壁上沉积物的研究     

安玉贤  张云庭 《东北林业大学学报》1993,21(3):102-108

用扫描电子显微镜观察了花曲柳(Fraxinus rhynchophylla Hance)木材细胞腔壁上沉积物的分布及存在形态。观察发现,花曲柳木材细胞腔壁上沉积物极为丰富,无论导管腔壁、木纤维细胞腔壁、轴向薄壁细胞腔壁还是射线薄壁细胞腔壁上均有分布,而且存在形态各异,特别是在轴向薄壁细胞和射线薄壁细胞腔壁上的沉积物最多,存在形态最为复杂。从构造的角度初步探讨了花曲柳木材细胞腔壁上沉积物对其木材液体渗透性的影响。  相似文献   

大豆专用肥对轮作,连作大豆叶片超微结构的影响   总被引：10，自引：0，他引：10  

童朝阳  韩丽梅 《大豆科学》1998,17(4):358-362

本文通过透射电镜观察了常规施肥与施用大豆专用复肥对轮作。连作大豆叶片超微结构的影响。结果发现，大豆连作导致叶绿体基粒片层结构破坏，淀粉粒积累，基粒片层结构出现“空隙区”。与常规施肥相比，施用复肥增强了轮作，连作大豆叶片叶绿体基粒片层结构的完整性，增加了基粒数量和基粒片层数，为促进大豆叶片的光合作用创造了条件，相关分析表明，叶绿体基粒片层数与大豆植株营养生长呈显著正相关。  相似文献   

大蒜发芽叶愈伤组织细胞超微结构观察与过氧化物酶同工酶的变化     

王洪隆  何俊英  马筠  洪仁远  王焘宽 《华北农学报》1991,(1)

在大蒜发芽叶愈伤组织发生过程中,线粒体、内质网、核糖体和质体的数量呈增加趋势,结构呈完善趋势,细胞液泡化程度降低;而愈伤组织细胞中,这些细胞器的数量有所下降,有的线粒体发生解体.细胞脱分化过程中,细胞分裂以核缢裂的无丝分裂方式进行.在愈伤组织发生过程中,过氧化物酶同工酶谱呈减少和减弱的趋势,而在愈伤组织中,又有所增加和增强.  相似文献   

孕穗期低温对玉米雌穗的伤害作用   总被引：8，自引：0，他引：8  

张毅  徐世昌 《作物学报》1995,21(2):235-239

在孕穗期（播种后６５天），玉米植株经１０℃低温处理２天和５天后，雌穗超氧物歧化酶（ＳＯＤ）活性下降，膜脂过氧化作用增强，对生物膜系统产生直接伤害，电解质外渗率增大，电镜下可观察到线粒体、细胞质膜破坏、胞间连丝膨大变形，甚至断裂；粗糙内质网卷曲成空心圆状，进而引起生理代谢紊乱，使可溶性糖和游离氨基酸含量增加，淀粉、蛋白质含量下降，阻碍雌穗发育，减少穗粒数，引起减产。  相似文献   

小麦D型细胞质雄性不育系和保持系小孢子发育的超微结构观察   总被引：2，自引：0，他引：2  

杨景成  于元杰等 《作物学报》2001,27(1):91-96

对小麦D型细胞质雄性不育系和保持系小孢子发育的超微结构观察发现,D型不育系小孢子在“小液泡期”即表现出败育迹象。花粉败育过程中,小孢子液泡膜和细胞质膜断裂破碎,细胞质解体,线粒体、质体、内质网等细胞器解体或退化,绒毡层持续不解体,并缺少乌氏体的分泌。小孢子细胞解体顺序为：细胞膜首先断裂,细胞质分解变稀薄,然后是核膜断裂,细胞核降解,细胞质及细胞核降解物质充满整个药室,最后核仁解体。  相似文献