Effects of NaCl Stress on Chlorophyll Fluorescence Parameters in Cinnamomum japonicum var. chenii

[Objective] Study on the changes of chlorophyll fluorescence parameters in Cinnamomum japonicum var. chenii under NaCl stress. [Method] The seedling growth increment,chlorophyll content and chlorophyll fluorescence parameters in leaves of 1-year old Cinnamomum japonicum var. chenii were investigated in field experiment. [Result] Under NaCl stress,seedling growth increment reduced and the chlorophyll content decreased to a stable value; changes of Fv/Fm and Fv/Fo showed identical increasing trend and double peak type. With the aggravation of salt stress,most variations were observed in Fo,correlations among chlorophyll fluorescence parameters presented "rise-drop" trend (in the treatment of 7 g/L NaCl). [Conclusion] Cinnamomum japonicum var. chenii is endowed with strong salt resistance and wide adaptability.     

断奶期仔猪防治E.coli的自然方法

仔猪服用抗生素能预防性地减少猪消化道中大肠杆菌数量吗?这是根本不可能的。有一些自然方法可以阻止病原体的存在。最近的两项试验表明,活性酵母可显著地降低由E.coli引发的新生和断奶仔猪死亡率和发病率。     

冬小麦“三优三防”高产栽培技术

山西省农业科学院于1983～1990年组织实施以粮为主大面积增产增收示范区工程,主要是在全省不同生态区建立30个中心示范点,第一年每点搞好2000亩样板田,共摆出6万亩主要粮食作物高产样板田,第二年指导带动60万亩粮田,第三年进一步扩大辐射600万亩粮田,促进作物产量较大辐度提高。在3年实施过程中,主要在南部冬麦区、中部冬麦区,分别设置了中心示范点,利用已有科研成果组装配套形成了与当地生态条件相适应的小麦高产抗逆配套栽培技术,在示范田上认真贯彻落实,同时根据生产上存在的问题,立题进行开发研究,补充和完善了保浇水地“三优三防”高产配套技术,亩产指标400公斤,经边试验研究边示范推     

A Rice CaMBP Gene is Induced in Organ-Specific Manner by Both Chilling and Heat-Shock Treatments

A rice CaMBP gene, OsCaMBP (AB363406), was isolated from a chilling treated rice using the fluorescent differential display (FDD) screening method. Its cDNA sequence (2094 bp) contains an opening reading frame (ORF) encoding a 569 amino acids protein (63.2 kD). OsCaMBP has the typical structural features of the CaMBP family, including the conserved IQ calmodulin-binding motif at the N-terminus. Homology analysis revealed 38.25%–47.28% identities of OsCaMBP with other CaMBPs in plants. RT-PCR analysis showed...     

Microstructure and Anatomical Characteristics of Daemonorops margaritae

Daemonorops margaritae is among the most important commercial rattan in South China. Its microstructure and basic anatomical characteristics as well as variation were investigated. Results show that: 1)The variation along the height is small, while the variation along the radial direction is significant; 2) The fibre length, fibre ratio and distribution density of the vascular bundles in the cross section decrease from cortex to core, while the fibre width, vessel element length and width, parenchyma ratio,...     

清热解毒化浊片对ETM兔肝组织CD14及TNF-α、IL-1表达的影响

目的 探讨清热解毒化浊片对内毒素血症（Endotoxemia,ETM）模型兔肝功能、肝组织CD14和血清肿瘤坏死因子-α（TNF-α）、白细胞介素-1（IL-1）的影响。方法 将21只新西兰大耳白兔随机分为正常组、模型组、清热解毒化浊片组（清化组）,每组7只。将模型组及清化组兔沿耳缘静脉注射大肠杆菌内毒素（LPS,10 μg/kg）,于造模后2 h干预,灌胃后2 h心脏采血检测家兔的肝功能、TNF-α和IL-α的变化,采肝脏组织检测CD14及观察肝脏病理形态。结果（1）与模型组比较,清化组ALT、AST上升（P<0.05）,肝组织CD14表达及血清TNF-α、IL-1下降（P<0.05）;（2）模型组肝细胞排列结构紊乱,有炎性细胞浸润,且出现空泡样改变,清化组及正常组改变不明显。结论 清热解毒化浊片能下调ETM模型兔CDl4、TNF-α和IL-1的表达,具有多靶点、多效应的干预作用,推测其有阻断早期LPS诱导信号通路的作用。     

凉膈散、银翘散对早期脓毒症炎症因子干预作用比较研究

目的 观察凉膈散、银翘散对早期脓毒症炎症因子IL-1β、TNF-α、IL-10的不同干预作用。方法 将40只新西兰大耳白兔随机分成空白对照组、模型组、银翘散治疗组、凉膈散治疗组、地塞米松对照组,采用耳缘静脉注射大肠杆菌内毒素的方法建立脓毒症模型,造模0.5 h后药物干预,4 h后观察兔一般情况及体温,检测血浆内毒素、促炎因子IL-1β、TNF-α及抗炎因子IL-10水平。结果 银翘散组兔全身情况好转,体温、血浆内毒素、IL-1β、TNF-α的水平均比模型组降低（P<0.01 or 0.05）;凉膈散组兔全身症状加重,体温、血浆内毒素、IL-1β、TNF-α、IL-10与模型组差异无统计学意义（P>0.05）。结论 银翘散能抑制早期脓毒症卫分证相关阶段促炎因子IL-1β、TNF-α的释放而减轻炎症反应、改善症状,但凉膈散不能抑制IL-1β、TNF-α释放、减轻炎症反应。     

13种海南入侵植物提取物对降香黄檀炭疽病菌的抑制作用

本文研究了13种海南入侵植物不同溶剂提取物对降香黄檀炭疽病菌的生物活性,以筛选出具有较好抑菌活性的植物提取物。结果表明:10种植物对炭疽病菌有一定的抑菌效果,其中效果最好的提取物为垂序商陆乙酸乙酯提取物,EC50为3.413mg/mL,其次是胜红蓟乙酸乙酯提取物以及飞机草乙醇提取物,EC50分别为5.849、21.984mg/mL。3种植物提取物都可以导致炭疽病菌菌丝畸形,高浓度垂序商陆与胜红蓟提取物甚至可以导致细胞壁破裂。垂序商陆提取物的MIC为5.0mg/mL,MBC为10mg/mL;胜红蓟提取物的MIC为7.5mg/mL,而MBC大于12.5mg/mL。     

Preparation and properties of high stability magnetorheological fluid

The effect of nitriding on the carbonyl iron powder is characterized by XRD,SEM and vibrating sample magnetometer.With the nitride iron powder,a MR fluid with the excellent performance has been prepared through adding in thixotropic agent of organobentonite and polymeric surfactant. The magnetic properties,rheological properties,antisedimentation and aggregation stability,temperature stability,tribology properties and damping properties of MR fluid has been studied. The properties are listed as follows：shear stresses is more than 60 kPa(B=0.5 T),off state viscosity is less then 1.0 Pa·s, and the three months settling rate is less than 10% and no hardening,easy redispersion. Temperature ranges from 20 to 125 ℃,and the maximum decay rate of the damping force is less then 14.3%.