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Polymorphonuclear leukocytes are degranulated in the lumens of vessels in synovial membrane in humans with various types of inflammatory arthritis and in dogs with synovitis induced by urate crystals. This degranulation, accompanied by the release of lysosomal enzymes and vasoactive materials, may be an important part of the mechanism resulting in vascular injury. 相似文献
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Transplantation of marrow to extramedullary sites 总被引:5,自引:0,他引:5
Autologous fragments of transplanted marrow have survived in various extramedullary sites in the rat, rabbit, and dog. Survival of the fragments occurs with a complete reconstitution of the hemopoietic and adventitial structures. The process originates from a network of surviving reticular cells which proliferate and differentiate into osteoblasts and give rise to trabecular bone. Later, the reticular cells reconstruct the marrow's microcirculation. Hemopoietic repopulation of the marrow implant takes place only after its sinusoidal microcirculation has been established. 相似文献
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水稻系列不育系对稻瘟病的抗性分析 总被引:1,自引:0,他引:1
以10个水稻系列不育系和6个恢复系配制一套包括16个亲本和60个F1为研究对象,采用苗期室内喷雾接菌和稻瘟病重发区田间自然诱发鉴定相结合的方法,分析供试亲本及其F1的抗性特征.结果表明:除连丰A外的9个不育系及其配制的54个F1,对2003-2006年福建省流行的稻瘟病菌生理小种及2006年上杭茶地田间稻瘟病菌的群体毒力都表现抗病反应,抗性频率100%,抗谱广,抗性评价均为抗(R);同时这9个不育系均含有显性主效抗瘟基因.连丰A的抗性频率为4.8%,抗谱窄,抗性评价为感(S).蜀恢527的抗性频率为76.2%,抗谱较广,中抗(MR);明恢77、晚3、福恢13和福恢5138的抗性频率均为4.8%,明恢86的抗性频率为14.3%,抗谱窄,抗性评价均为感(S).本研究反映了亲本抗性遗传背景,避免育种中同一抗源反复使用以延长品种使用寿命,并提出当前亟需引入新抗源,以丰富水稻抗性遗传基础. 相似文献
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Achard P Cheng H De Grauwe L Decat J Schoutteten H Moritz T Van Der Straeten D Peng J Harberd NP 《Science (New York, N.Y.)》2006,311(5757):91-94
Plants live in fixed locations and survive adversity by integrating growth responses to diverse environmental signals. Here, we show that the nuclear-localized growth-repressing DELLA proteins of Arabidopsis integrate responses to independent hormonal and environmental signals of adverse conditions. The growth restraint conferred by DELLA proteins is beneficial and promotes survival. We propose that DELLAs permit flexible and appropriate modulation of plant growth in response to changes in natural environments. 相似文献
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19个水稻雄性不育系对南方水稻黑条矮缩病的抗性评价 总被引:2,自引:0,他引:2
【目的】评价水稻雄性不育系对南方水稻黑条矮缩病的抗性,为选配抗南方水稻黑条矮缩病的杂交稻组合提供材料。【方法】以19份水稻雄性不育系为材料,采用田间调查自然发病率结合分子检测的方法,评价其对南方水稻黑条矮缩病的抗性。【结果】鉴定出高抗不育系1份,为13s;中抗不育系3份,为分别1s、8s、14s;中感不育系4份,分别为17s、19s、15s、6s;感病不育系10份,分别为18s、3s、9s、12s、11s、4s、16s、5s、7s、2s;高感不育系1份,为10s;未发现对南方水稻黑条矮缩病免疫的材料。【结论】供试的水稻雄性不育系对南方水稻黑条矮缩病普遍表现为抗病性不强,但品种间差异显著,其中13s、1s、14s、8s具有较强的抗病性,是抗病育种中可以利用的资源。 相似文献
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通过利用水稻温敏核不育系分期播种试验在不同的自然温度条件下的育性观察结果,进行育种与温度相关性分析,结合散布图、套袋结实率及自交结实率,可以判定温敏雄性不育性转换的温度敏感期及敏感期长短,不育基因表达所需的临界日均温及育性的稳定性。结果表明:温敏不育系的可育性与敏感期日均温呈极显著负相关。 相似文献
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网站建设安全问题的分析与解决方法 总被引:1,自引:1,他引:1
目前,网站建设安全问题引起了人们广泛关注.本文从网站建设硬件的设置角度,如用户设置、服务器设置、Intemet设置、网络设备等方面进行了阐述,尤其着重介绍了网页编码的安全设置. 相似文献
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一个与西瓜核不育育性基因连锁的AFLP分子标记的获得 总被引:2,自引:0,他引:2
以西瓜G17AB核雄性不育两用系为材料,采用BAS法构建了不育池和可育池。利用AFLP分子标记技术,通过筛选256对AFLP引物组合,获得了一个与育性位点紧密连锁的AFLP标记,片段长度在310~350 bp之间,该标记与育性基因的遗传距离为5.0 cM。 相似文献
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As monkeys perform schedules containing several trials with a visual cue indicating reward proximity, their error rates decrease as the number of remaining trials decreases, suggesting that their motivation and/or reward expectancy increases as the reward approaches. About one-third of single neurons recorded in the anterior cingulate cortex of monkeys during these reward schedules had responses that progressively changed strength with reward expectancy, an effect that disappeared when the cue was random. Alterations of this progression could be the basis for the changes from normal that are reported in anterior cingulate population activity for obsessive-compulsive disorder and drug abuse, conditions characterized by disturbances in reward expectancy. 相似文献
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选用4个光温敏核不育系,考察其在自然条件和喷施"九二○"条件的柱头外露率,了解其柱头外露特性,研究喷施"九二○"对不育系柱头外露的影响。结果表明,自然条件下各不育系柱头总外露率介于79.8%~87.1%之间,处于较高水平,GD-7S最高,各不育系外露柱头都是单边外露居多。在喷施"九二○"条件下,各不育系(除GD-7S)柱头总外露率得以提高,普遍提高柱头单边外露率,对柱头双边外露率则因不育系而异,兴86S柱头总外露率对"九二○"反应最好,提高程度最高。可见,"九二○"能提高不育系柱头外露率,尤其是单边外露率。 相似文献
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The forest frog Eleutherodactylus coqui defends specific sites for retreats and nests in the Luquillo Forest, Puerto Rico. The hypothesis that shortages of nest and retreat sites limit population size was tested by placing 100 bamboo frog houses in plots measuring 100 square meters in areas of high frog density. These new sites were readily adopted by adult frogs. After one year, experimental plots had significantly more nests and frogs of all sizes than did control plots. 相似文献