甘蔗品种桂糖42号、桂糖44号的种性分析及其栽培效应     

王伦旺  廖江雄  谭芳  唐仕云  李翔  王宇萍  邓宇驰  吴才文  吴转娣 《广西糖业》2022,42(2):10-15

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淡水小龙虾头中甲壳素的EDTA法提取工艺研究     

窦勇  胡佩红  王芳 《农业科技与装备》2014,(3):59-61,63

以淡水小龙虾头为原料,采用EDTA法提取甲壳素,在单因素试验的基础上,通过正交试验筛选最佳工艺条件。试验结果表明:以13%的EDTA溶液作提取溶剂,在反应温度30℃、pH 12、投料比1∶15、反应25 min的条件下,提取效果最佳,提取率达24.05%,反应前后的脱钙和脱蛋白率分别为100.0%和98.6%。  相似文献   

影响近红外对油菜种子品质分析的几个因素     

朱文秀  白俊霞  邹芳  曾章丽  侯燕 《安徽农业科学》2014,(34):12039-12040,12067

[目的]为了研究样品本身的因素.[方法]通过试验及人为制造油菜种子异样,并通过其与正常样品的近红外品质分析结果比对,探讨样品量、含水量、发霉率、芽粒率以及成熟度对近红外品质分析结果的影响.[结果]样品量、含水量、发霉率、芽粒率以及成熟度对近红外品质测定结果都有不同程度的影响.[结论]在用近红进行正常的品质分析时,应尽量做到待测样品在样品量、含水量、净度、成熟度等方面与定标样品保持一致.  相似文献   

碳纳米管对水稻种子萌发和根系生长的影响   总被引：3，自引：0，他引：3  

姜余梅  刘强  赵怡情  刘清岱  王芳  华泽田 《湖北农业科学》2014,(5):1010-1012

将辽粳294水稻种子和不同浓度的碳纳米管共培养,对水稻种子萌发和幼苗生长情况进行观察,研究碳纳米管对水稻种子萌发和幼苗生长的影响。结果表明,适当浓度的碳纳米管(50~100μg/mL)促进了水稻种子发芽、根系生长和根系活力。当碳纳米管浓度增加到150μg/mL时,根系活力较100μg/mL时降低,但仍略高于对照。说明较低浓度的碳纳米管可以促进水稻种子发芽、根系生长和根系活力,而高浓度的碳纳米管则可能产生毒害作用。  相似文献   

Recovery of bioactive compounds from Pinus pinaster wood by consecutive extraction stages     

Enma Conde  Wenwen Fang  Jarl Hemming  Stefan Willför  Herminia Domínguez  Juan Carlos Parajó 《Wood Science and Technology》2014,48(2):311-323

Pinus pinaster wood samples, obtained at different positions of three healthy trees, were subjected to two sequential extractions using an Accelerated Solvent Extraction instrument. The first extraction was carried out with hexane (to remove lipophilic extractives) and the second one with acetone/water (95:5 v/v) to recover bioactive phenolic compounds, the target compounds of this study. The extracted fractions were assayed for total yield and composition. The extracts contained a spectrum of phenolic compounds (simple phenolics, phenolic stilbenes, flavonoids and lignans) and non-phenolic components (juvabiones, resin and fatty acids, steryl esters and triglycerides). The fractionation effects achieved by consecutive extractions and the recovery of bioactive phenolics are discussed.  相似文献   

Soil water affects transpiration response to rainfall and vapor pressure deficit in poplar plantation   总被引：2，自引：0，他引：2  

Lixin Chen  Zhiqiang Zhang  Tonggang Zha  Kangle Mo  Yan Zhang  Xianrui Fang 《New Forests》2014,45(2):235-250

Influences of environmental factors on transpiration are interactive. Sensitivities of transpiration responses to both evaporative demand and rainfall under contrasting soil water conditions constitute the physiological basis of the drought tolerance of trees. Such knowledge is practically significant for plantation management, especially for irrigation management. We therefore conducted a 6-year study on the transpiration of a poplar plantation in temperate China to elucidate the existence and pattern of the influence of the soil water over stand transpiration responses to (1) vapor pressure deficit (VPD), the major indicator of air dryness and (2) the rainfall, in terms of total amount and event size. The results showed that the response of plantation transpiration (E _c ) to VPD was conditioned by soil moisture. There was a significant difference in the frequency distribution of maximum sap flux under contrasting soil relative extractable water. E _c after rainfall of different sizes varied under similar VPD. The increasing occurrences of only large rainfall events led to enhanced total E _c during the growing season, but prolonged rainless intervals did not lead to a continuous decrease of E _c , suggesting appreciable supplements from the soil water were present to sustain transpiration. In addition, the balance of soil water between replenishment and extraction also conditioned the influence of rainfall over subsequent E _c during the respective rainless intervals. Based on the E _c responses to VPD and rainfall under different soil moisture levels, irrigation that directly replenishes the deep soil layers in order to alleviate water stress on transpiration during the small-rain event-dominated growing season is an effective and water-saving approach to guarantee trees survival during drought period.  相似文献   

阴香木材干燥特性研究     

曾辉  李秀荣  蒋小华  陈健  王芳  廖章兵 《森林工程》2014,(1):56-59

为掌握阴香木材的干燥特性,制定合理的干燥基准.利用百度试验法进行研究阴香木材的干燥特性,结果表明：阴香木材干燥速度为2级,较快;截面变形程度较轻,为1级;初期开裂较严重,为3级;扭曲等级为3级,无内裂.针对阴香木材的干燥特性,参照百度试验缺陷等级以及干燥缺陷对应的干燥条件拟定25～ 30 mm厚阴香木材的干燥基准.在实际的窑干生产中只需对拟定的干燥基准进行适当的调整和优化便可以得到适合于阴香木材的干燥基准,提高干燥基准的制定效率,为促进阴香木材的开发和利用提供科学的理论依据.  相似文献   

蝴蝶兰倍性与叶部和花部性状的相关性     

谢利  刘芳  易懋升  曾瑞珍  夏晴  黎杨辉  张志胜 《华南农业大学学报》2014,35(5):82-87

【目的】研究蝴蝶兰Phalaenopsis倍性与主要性状的相关性.【方法】采用压片法对85份蝴蝶兰资源的倍性进行了鉴定,测量了这些资源的气孔长度、气孔密度、叶长、叶宽、叶厚、花朵直径和花朵数.【结果和结论】85份蝴蝶兰资源中3份为二倍体,占3.5%;9份为三倍体,占10.6%;73份为四倍体,占85.9%.四倍体蝴蝶兰的气孔长度和花朵直径显著大于二倍体和三倍体,而气孔密度和花朵数显著少于二倍体和三倍体(P0.05).三倍体蝴蝶兰的气孔长度、花朵直径和花朵数与二倍体蝴蝶兰差异均不显著(P0.05),但气孔密度显著小于二倍体(P0.05).四倍体蝴蝶兰的叶长显著大于二倍体(P0.05),但二倍体与三倍体、三倍体与四倍体在叶长上差异不显著(P0.05).二倍体、三倍体和四倍体在叶宽和叶厚上差异均不显著(P0.05).蝴蝶兰倍性与气孔长度、叶长和花朵直径呈极显著的正相关关系,与气孔密度和花朵数呈极显著的负相关关系.  相似文献   

基于量子点的赭曲霉毒素AsFLISA检测技术研究     

房保海  贾俊涛  梁旭锋  姜英辉  李正义  房倩  金莹 《山东农业科学》2014,(4):102-105

建立了基于量子点标记技术的赭曲霉毒素A(Ochratoxin A,OTA)双抗夹心荧光免疫检测(sandwich fluorescence-linked immunosorbent assay,sFLISA)体系,包含多克隆包被抗体、生物素标记的多克隆检测抗体、量子点标记的链霉亲和素等,获得了sFLISA的最佳操作参数:包被抗体浓度2.5μg/mL,检测抗体稀释500倍,量子点标记链霉亲和素稀释100倍。该方法在OTA浓度3.125~125μg/L之间时,相对荧光强度和OTA浓度呈线性关系,回归方程为y=0.0206x+0.2018,R2=0.9924;加标回收率在90.1%~110.0%之间,变异系数均小于10%,能较好地进行赭曲霉毒素A的定量检测。  相似文献   

人居环境视角下的农村客运交通发展研究     

陈芳  邱昊  范小丽 《江西农业学报》2014,(2):140-143,147

通过阐述农村客运交通的发展现状、存在的主要问题以及制约因素,提出了推进农村客运交通服务均等化的发展对策。  相似文献