雏鸡中枢免疫器官内B淋巴细胞变化规律     

马跃  杨树宝  胡庆花  齐花蕊  单春兰  栾维民 《中国兽医学报》2015,35(6):957-960

为了研究雏鸡在正常发育过程中免疫器官内B淋巴细胞的变化规律,以不同日龄的SPF鸡为研究对象,用流式细胞术检测鸡脾脏、胸腺及法氏囊内IgA+、IgG+及IgM+B淋巴细胞含量的变化情况。结果显示,在脾脏中,4日龄时B淋巴细胞含量比较多,7日龄时B淋巴细胞含量下降,随后,7至21日龄细胞含量逐渐升高;胸腺内则是在4日龄时IgM+B淋巴细胞含量相对较高,而IgA+、IgG+B淋巴细胞几乎没有;在法氏囊中,IgA+、IgG+及IgM+B淋巴细胞含量在4至14日龄时逐渐升高,并且IgA+和IgG+细胞含量在21日龄时基本趋于稳定,但是IgM+B细胞含量则在21日龄时有所下降。试验结果表明,雏鸡出壳后各免疫器官B淋巴细胞始终以IgM+细胞含量最多。  相似文献   

毛竹珍稀新栽培变种——绿槽龟甲竹     

陈天国 《世界竹藤通讯》2014,(2):23-24

描述了毛竹的1个新栽培变种——绿槽龟甲竹。其竹秆下部一段的节交互歪斜,上下节在一侧相连,而节间在另一侧偏肿呈龟甲状,竹秆黄色,且龟甲状秆对称绿色纵条纹,分枝一侧纵沟槽绿色,叶片有淡黄色细纵条纹。  相似文献   

Characterization of the intestinal mucosal proteome in cats with inflammatory bowel disease and alimentary small cell lymphoma     

Sina Marsilio  Floris C. Dres  Lawrence Dangott  Betty Chow  Steve Hill  Mark Ackermann  J. Scott Estep  Jonathan A. Lidbury  Jan S. Suchodolski  Jrg M. Steiner 《Journal of veterinary internal medicine / American College of Veterinary Internal Medicine》2021,35(1):179-189

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CD8⁺T细胞在不同年龄家兔胃肠道的分布规律     

谢飞  李淑娴  火兴民  刘丽萍  李瑞  张学锋  王雯慧 《中国兽医学报》2021,(2):279-283,344

探讨不同年龄组家兔胃肠道各段CD8⁺T细胞的分布特征,为进一步研究CD8⁺T细胞的作用奠定形态学基础。采用免疫组织化学技术对不同年龄组(幼年组、青年组、老年组)家兔胃肠道内CD8⁺T细胞进行染色、观察及统计分析。结果显示,家兔的CD8⁺T细胞多呈圆形、椭圆形或呈不规则形。在不同年龄组家兔,胃肠不同部位的分布有如下特点:家兔的CD8⁺T细胞主要分布于胃肠道的固有层中;青年组CD8⁺T细胞的分布数量显著高于幼年组和老年组;各肠段之间CD8⁺T细胞分布的数量差异不显著,但其分布的总量按照小肠、大肠、胃的顺序依次降低。研究结果显示,CD8⁺T细胞在家兔小肠的分布最多,并且其数量随着年龄的增长呈现先上升后下降的趋势,青年家兔胃肠的分布最为丰富。  相似文献   

Effects of different dl‐selenomethionine and sodium selenite levels on growth performance,immune functions and serum thyroid hormones concentrations in broilers          下载免费PDF全文

Y. Wang  H. Wang  X. Zhan 《Journal of animal physiology and animal nutrition》2016,100(3):431-439

This trial was conducted in a 2 × 3 + 1 factorial arrangement based on a completely randomized design to evaluate the effects of different dl ‐selenomethionine (dl ‐Se‐Met) and sodium selenite (SS) levels on growth performance, immune functions and serum thyroid hormones concentrations in broilers. A total of 840 Ross 308 broilers (7 days old) were allocated by body weight to seven treatments (three replicates of 40 birds each treatment) including (1) basal diet (containing 0.04 mg of selenium (Se)/kg; control) without supplementary Se; (2, 3 and 4) basal diet + 0.05, 0.15 or 0.25 mg/kg Se as SS; (5, 6 and 7) basal diet + 0.05, 0.15 or 0.25 mg/kg Se as dl ‐Se‐Met. The experiment lasted 42 days. The results revealed that dietary Se supplementation improved (p < 0.05) average daily gain, feed efficiency, immune organ index, serum immunoglobulin A (IgA), immunoglobulin G (IgG), immunoglobulin M (IgM) and triiodothyronine (T₃) concentrations and decreased (p < 0.01) thyroxine (T₄)/T₃ ratio in serum compared with the control. Broilers receiving the dl ‐Se‐Met‐supplemented diets had higher (p < 0.05) feed efficiency, thymus index, the amounts of IgA, IgG, IgM and T₃ as well as lower (p < 0.05) serum T₄ concentrations and T₄/T₃ ratio than those consuming the SS‐supplemented diets. Serum IgA and IgM levels of broilers fed 0.15 mg Se/kg were significantly higher (p < 0.05) than those of broilers fed 0.05 or 0.25 mg Se/kg. In summary, we concluded that dl ‐Se‐Met is more effective than SS in increasing immunity and promoting conversion of T₄ to T₃, thus providing an effective way to improve the growth performance of broilers. Besides, based on a consideration of all experiment indices, 0.15 mg Se/kg was suggested to be the optimal level of Se supplementation under the conditions of this study.  相似文献   

用葡萄球菌甲蛋白协同凝集鉴别猪痢疾密螺旋体的研究     

金梅林  王禹志 《华中农业大学学报》1994,13(3):274-277

应用猪痢疾蜜螺旋体（Ｔ．Ｈ．）免疫血清结合葡萄球菌甲蛋白（ＳＰＡ）与Ｈ１０，２－５，Ｘ２３，Ｃ１７等Ｔ．Ｈ．菌株进行协同凝集试验，均出现明显凝集反应。而免疫血清结合不含ＳＰＡ的菌株，无特定病原（ＳＰＦ）血清结合含ＳＰＡ的菌株均无凝集反应。免疫血清结合ＳＰＡ与７种肠道菌均无凝集反应。免疫血清用量以０．２ｍｌ为合适。最低用菌量为３０倍稀释，即每个视野Ｔ．Ｈ．约４０个菌体。  相似文献   

动物鲜味受体的研究进展及其基因表达调控     

王晶  张勇  黄铁军 《动物营养学报》2016,(9):2702-2708

动物的鲜味受体包括代谢型谷氨酸受体(m GluR)和味觉受体异源二聚体(T1R1/T1R3),是C型G蛋白偶联受体,N末端捕蝇草模块(VFT)区域可与鲜味配体结合,识别鲜味。本文主要论述了鲜味受体的研究进展、鲜味识别转导机制及鲜味受体基因的表达调控等,以期为相关研究提供参考。  相似文献   

试论我国科技期刊发展的集团化趋势     

于伟  黄秀环  徐谋卿 《农业图书情报学刊》2010,22(11):255-257

在分析我国科技期刊发展的现状的基础上,提出了集团化是科技期刊发展的必然趋势。  相似文献   

山豆根多糖对鸡脾脏淋巴细胞信号转导相关分子水平的影响   总被引：2，自引：0，他引：2  

帅学宏  苏子杰  胡庭俊  曾芸  韦英益  李跃华 《动物医学进展》2010,31(1):36-41

为探讨山豆根多糖(SSP)对体外培养的鸡脾脏淋巴细胞信号分子的影响,采用终浓度为50、100、200、400μg/mL的山豆根多糖分4、8、12、24 h 4个时间段刺激培养鸡脾脏淋巴细胞,测定培养上清或细胞内环磷酸腺苷(cAMP)、环磷酸鸟苷(cGMP)、6-酮-前列腺素F1α(6-keto-PGF1α)、血栓素B2(TXB2)和一氧化氮(NO)信号转导分子水平。结果表明,山豆根多糖在终浓度为100μg/mL时与鸡脾脏淋巴细胞共同培养8 h后能显著升高cAMP(P0.01)、6-keto-PGF1α(P0.05)、TXB2(P0.01)水平,4种浓度的山豆根多糖对NO分子水平随时间的变化有不同程度的升高(P0.05),影响cAMP/cGMP和6-keto-PGF1α/TXB2信号体系。提示山豆根多糖可通过影响免疫细胞内的信号转导而影响机体的免疫功能。  相似文献   

Effects of Shading on Chlorophyll Content,Chlorophyll Fluorescence and Photosynthesis of Subterranean Clover     

R. P. Mauro  A. Occhipinti  A. M. G. Longo  G. Mauromicale 《Journal of Agronomy and Crop Science》2011,197(1):57-66

A field‐experiment (2004/2005 and 2005/2006 seasons) was conducted in the coastal plain of south‐eastern Sicily (37°03′N, 15°18′E, 15 m a.s.l.), on a Calcixerollic Xerochrepts soil, aimed at quantifying the effect of shading on chlorophyll (Chl) content, Chl fluorescence, photosynthesis and growth of subterranean clover. Four levels of photosynthetically active radiation reduction (from 0 % to 90 %) were tested on Trifolium brachycalycinum cv. ‘Clare’ and Trifolium subterraneum ecotype ‘Ragalna’. In both species shading progressively increased F_v/F_m, internal CO₂ concentration, diffusive leaf resistance and specific leaf area (up to 8 %, 34 %, 18 % and 68 %, respectively), and decreased Chl content, T_max, photosynthetic rate and plant dry weight (up to 9 %, 24 %, 79 % and 39 %, respectively). As plants aged, characteristic bell‐shaped trends were evident for photosynthetic parameters, with F_v/F_m increasing up until the onset of flowering, and thereafter declining. This implies that F_v/F_m may be a useful indicator of earliness in subterranean clover genotypes. The aboveground dry biomass response to shading was both genotype‐ and season‐dependent, but was predictable from the measurement of relative leaf Chl content. Moreover, our results suggest that an improvement in the interaction between host‐rhizobium may represent a major potential breeding target for enhancing subterranean clover tolerance to shading.  相似文献