双环缝喷射共沉积SiC颗粒的捕获与分布研究     

蔡建国  陈刚 《中国动物检疫》2007,(12)

采用坩埚移动式喷射共沉积装置及其双环缝复合雾化器制备了SiC颗粒增强铝基复合材料坯件,研究了过程中增强颗粒的捕获机制及特点.实验结果表明,双环缝复合雾化器所引入的SiC颗粒捕获率较高,分布均匀;增强颗粒主要在雾化初时阶段被雾化液滴所捕获,而沉积坯表面因基本呈固相且温度较低,对SiC颗粒的直接捕获效果不明显;沉积坯快冷凝固界面前沿捕获对SiC颗粒的分布影响不大,SiC颗粒在沉积坯中的最终分布主要取决于由雾化液滴对增强颗粒的捕获,特别决定于SiC颗粒在单个雾化颗粒内部及空间雾化颗粒群中的分布.  相似文献   

共轭亚油酸对猪脂肪沉积的影响   总被引：1，自引：0，他引：1  

周杰 《中国饲料》2005,(14):19-21

本文就共轭亚油酸对猪脂肪沉积、脂肪组织中脂肪酸的组成、脂肪代谢的影响作一综述,并探讨共轭亚油酸可能的作用机理。  相似文献   

鸡肉肌苷酸和肌内脂肪沉积规律研究   总被引：19，自引：6，他引：19  

陈继兰  文杰  王述柏  赵桂苹  郑麦青  李小华 《畜牧兽医学报》2005,36(8):843-845

鸡肉肌苷酸（IMP）和肌内脂肪（IMF）含量与鸡肉风味品质密切相关，脂肪决定了鸡肉特殊的肉香味，而肌苷酸是一种重要的滋味物质。不同的消费者对肉鸡的品种、年龄、性别乃至部位都有不同偏好，这除了与风俗习惯有关外，更重要的是对品质和风味特性的选择。本研究通过比较不同品种、性别、日龄和部位的鸡肉IMP和IMF的含量，旨在探讨IMP和IMF的沉积规律，为确定风味性状选择方法提供依据。  相似文献   

泰山-18BC型机动喷雾机防治麦蚜效果与农药沉积分布的关系   总被引：1，自引：0，他引：1  

陈万权  袁会珠  秦庆明  张跃进  赵清 《植物保护学报》2001,28(4):340-344

泰山－18BC型机动喷雾机喷施氧乐果防治麦蚜效果好、施药剂量低、持效期长，450ml/hm^2剂量和75L／hm^2施药液量比较适宜。农药在麦株各部位的沉积分布差异明显，以穗部沉积量最高。施药剂量与农药沉积量呈正相关，药效随农药沉积量的增加而相应地提高，其ED50和ED90分别为0．1和0．6（ai)μg/cm^2。与工农－16型手动喷雾器相比，机动喷雾机工效高，施药液量少，小麦植株（尤其是穗部）沉积量高，可节省用药20％－50％，有效喷幅可达6m,其中1－4m处防效最高，具有取代手动喷雾器的优越条件。  相似文献   

Infection behavior of Alternaria alternata Japanese pear pathotype and localization of 1,3- β -d -glucan in compatible and incompatible interactions between the pathogen and host plants     

Tomoko Suzuki  Takeshi Shinogi  Yoshihiro Narusaka  Pyoyun Park 《Journal of General Plant Pathology》2003,69(2):91-100

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Effects of Nitrogen Deposition on Soil fungi Community Structure in Stipa Baicalensis Steppe北大核心CSCD     

Liu H.-M.  Zhang H.-F.  Qi J.  Yang D.-L. 《草地学报》2019,(1):63-70

Effects of six continuous years nitrogen deposition on soil fungi community structure in Stipa Baicalensis steppe were investigated by using high-throughput sequencing technology. The experiment included eight manipulative treatments:(0,15,30,50,100,150,200 and 300 kg N·hm-2·a-1). Soil samples were separately collected from the 0~10 cm and 10~20 cm soil layer. The results showed that nitrogen deposition significantly affected the structure of fungi community. the relative abundance of fungi in the phyla,class and genus level were significantly different at the 0~10 cm and 10~20 cm soil layer of nitrogen deposition treatment. The response of soil fungal community to nitrogen deposition at the 0~10 cm soil layer and 10~20 cm soil layer was significantly different,and there was obvious soil gradient effect. Canonical correspondence analysis (CCA) showed that soil pH,soil total organic C,NO3-N and available P were key environmental factors leading to the shift in the soil fungal community composition. In conclusion,nitrogen deposition changed the soil chemical properties,which drove the change of soil microbial communities and soil fungal communities. © 2019 China Agricultural University. All rights reserved.  相似文献   

猪LYRM1基因对脂肪沉积的影响研究   总被引：1，自引：1，他引：0  

苑洪霞  骆金红  冯文武  陈祥 《畜牧兽医学报》2019,(4):677-687

旨在探究LYRM 1对脂肪沉积的影响。本研究采用qRT-PCR法检测LYRM1基因在10月龄白洗猪不同组织中的表达水平;PCR扩增白洗猪LYRM1基因的CDS区,构建pEGFP-N3-LYRM1重组质粒,利用脂质体转染法转染pEGFP-N3-LYRM1重组质粒进入白洗猪皮下脂肪前体细胞,通过检测细胞培养基中三酰甘油浓度,利用血清饥饿法和MTT法检测细胞凋亡水平;qRT-PCR检测LYRM1、PPARγ、ATGL、FAS基因的mRNA表达水平。结果显示,LYRM1基因在白洗猪脂肪组织中表达量最高;成功转染pEGFP-N3-LYRM1重组质粒进入白洗猪皮下脂肪前体细胞,转染试验组培养基中三酰甘油浓度大于空白对照组,试验组与空白对照组的细胞凋亡速率一致,未见显著差异;试验组LYRM1、PPARγ、ATGL、FAS基因的mRNA表达量极显著高于对照组(P<0.01)。综上表明,LYRM1基因超表达可提高三酰甘油的浓度,促进脂肪沉积,提高脂肪沉积相关基因mRNA的表达水平,间接提高脂肪沉积水平。因此认为,LYRM1基因可作为探究影响脂肪沉积的候选基因,为研究脂肪沉积机制提供理论基础。  相似文献   

Precipitation and Nitrogen Deposition Alter Litter Decomposition Dynamics in Semiarid Temperate Steppe in Inner Mongolia,China     

Zhongqing Yan  Yuchun Qi  Yunshe Dong  Qin Peng  Shufang Guo  Yunlong He  Zhaolin Li 《Strength and Conditioning Journal》2018,71(2):220-227

Plant litter decomposition is one of the most important links connecting plants to the soil through the carbon (C) and nitrogen (N) cycles. Climate change scenarios predict changes in precipitation and N deposition, and previous studies have demonstrated that increases in the availability of water and N affect the litter decomposition rate and nutrient release. We studied the effects of increased N deposition and precipitation on changes in the remaining mass and the C and N contents of shoot litter after decomposition in a typical steppe in Inner Mongolia, China. The treatments included the addition of NH₄NO₃ at rates equivalent to 0, 25, 50, and 100 kg ? N ? ha^? 2yr^? 1 with and without added water. The addition of water proved to be a more effective practice than amendment with NH₄NO₃ for improving the litter decomposition rate; the addition of water significantly increased the rate of litter decomposition (P < 0.001), whereas the addition of N alone had no apparent effect on litter mass loss. However, a repeated measures analysis of variance (ANOVA) showed that the interaction of water and N significantly affected both mass loss and litter N content (P < 0.05), and a linear relationship was identified between litter mass loss and litter decomposition time (P < 0.001). No correlation was found between litter mass loss and organic C content, but a significant positive correlation was found between residual litter mass and N content (P < 0.01). Although the study was conducted over a relatively short period, our results indicate that increased precipitation could potentially promote litter decomposition, whereas increased N input has little effect. The effects of time on litter mass loss and residual C and N concentrations indicate the need for long-term trials that measure the complete process of litter decomposition and the peaks of C and N release.  相似文献   

叶片倾角、雾滴大小与施药液量对毒死蜱在水稻植株沉积的影响   总被引：17，自引：6，他引：17  

朱金文  吴慧明  孙立峰  朱国念 《植物保护学报》2004,31(3):259-263

为提高农药的有效利用率,用丽春红为示踪剂研究了毒死蜱药液在水稻叶片上的沉积特性.随着水稻叶片的倾角变小,毒死蜱的沉积量相应地减少.用体积中径(VMD)为149.5 μm的雾滴处理,在设定叶片倾角为90°、60°、30°时,毒死蜱沉积量分别是直立叶片上沉积量的10.2、5.8、2.9倍.随着叶片倾角变小,雾滴VMD对沉积的影响增大,在90°、60°、30°、0°四个叶片倾角,用VMD149.5 μm雾滴处理的沉积量分别是用VMD 233.7 μm雾滴处理沉积量的1.5、2.1、3.3、5.5倍.在施药液量170～1.36×103L/hm2范围内,毒死蜱沉积量随施药液量的增加而减少.用浓度为800mg/L毒死蜱药液在水稻叶片上测定的最大稳定持留量约为4.66μg/cm2.结果表明,采用小雾滴与低容量喷雾,可显著提高毒死蜱在水稻叶片的沉积量.  相似文献   

日粮锰对肉仔鸡组织器官锰、铜、锌沉积的影响   总被引：1，自引：0，他引：1  

袁缨  胡忠宏 《畜牧与兽医》2004,36(4):11-13

选用 1日龄艾维茵肉仔鸡 ,采用单因子多水平随机化试验设计 ,随机分成 6组 ,每组 3个重复 ,每个重复 8只鸡。在玉米 豆粕型基础日粮中分别添加锰 (MnSO4 ·H2 O) 0 ,40 ,80 ,1 2 0 ,1 60 ,2 0 0mg/kg ,研究日粮锰对肉仔鸡组织器官锰、铜、锌沉积的影响。结果表明 :在肉仔鸡日粮中添加 40 2 0 0mg/kg的锰 ,对胫骨锰、肝脏锰和肾脏锰的沉积有显著的影响 (P <0 0 5) ;日粮锰的添加对肝铜和肾铜沉积无明显影响 (P >0 0 5) ,但日粮锰添加量超过 1 2 0mg/kg时 ,能够减少胫骨铜的沉积 (P <0 0 5) ;对胫骨、肝和肾中锌的沉积无明显影响(P >0 0 5)。  相似文献