魔芋北移引种研究     

吴万兴  王照利  张忠良 《西北农林科技大学学报(自然科学版)》2002,30(6):156-161

自1996年开始,陆续在陕西榆林毛乌素沙地、内蒙古磴口乌兰布和沙地、内蒙古赤峰科尔沁沙地和黑龙江泰来嫩江沙地进行了花魔芋和白魔芋引种试验。试验结果表明,花魔芋在陕西榆林毛乌素沙地、内蒙古赤峰科尔沁沙地表现出丰产性和稳产性,生长量和产量指标基本接近种源产地;花魔芋在内蒙古磴口乌兰布和沙地和黑龙江泰来嫩江沙地能够生长,但产量不高;白魔芋在4个引种点均能生长,但产量低。  相似文献   

不同种植模式魔芋种芋经济效益比较   总被引：1，自引：0，他引：1  

周启江  ;郑元红  ;孙川川 《长江蔬菜》2014,(16):28-29

通过开展3种魔芋种芋的不同种植模式比较试验,探讨魔芋种芋产量及经济效益的关系。试验结果表明,林下间作模式植株健壮,产量最高,单位投入居中,产值最高,投产比最高。露地种植模式,随着密度增加,单芋质量和膨大系数呈下降的趋势,单位投入增大,单产增加,投产比差异缩小。相近密度的林下模式单芋质量和膨大系数相对较大,林下间作模式的魔芋种芋经济效益为最佳。  相似文献   

Effects of astaxanthin and esterified glucomannan on hematological and serum parameters,and liver pathological changes in broilers fed aflatoxin‐B1‐contaminated feed     

Jigang Cao  Wenjun Wang 《Animal Science Journal》2014,85(2):150-157

The effects of astaxanthin (ASTA) and esterified glucomannan (EMG) on hematological and serum parameters, and liver pathological changes in broilers fed on aflatoxin‐B1 (AFB1) contaminated diet were investigated. Two hundred and forty 10‐day‐old broilers were randomly assigned to one of five dietary treatments including: (i) control diet; (ii) AFB1‐contaminated diet; (iii) AFB1 + EGM diet; (iv) AFB1 + ASTA diet; and (v) AFB1 + EGM + ASTA diet. At 35 days old, blood and liver tissue samples were collected for analysis. Results indicated that total white blood cell (WBC) number, hemoglobin (Hgb) concentration, hematocrit (Hct) level, serum alanine amino transferase (AST) and γ‐glutamyl transferase (GGT) activities, red blood cell (RBC) number, serum globulin (GLB) and urea nitrogen (BUN) concentrations (P < 0.05) were increased by feeding AFB1‐contaminated diet. EMG and ASTA alleviated the alteration of RBC, WBC, Hgb and AST caused by AFB1‐contaminated diet. Liver superoxide dismutase (SOD) activity was reduced, while myeloperoxidase (MPO) activity was increased by AFB1‐contaminated diet (P < 0.05). Both EGM and ASTA restrained the increase of MPO activity (P < 0.05). Degeneration of the liver tissues was found in broilers fed AFB1‐contaminated diet. It suggested that feeding 0.4 mg/kg AFB1‐contaminated diet resulted in adverse effects on blood parameters and liver morphology. Dietary addition of EGM addition at 5 g/kg diet, ASTA at 10 mg/kg diet and especially their combination showed positive protection effects on alleviating the alteration of feeding AFB1. The results indicated that supplementation of 5 g EGM/kg diet, 10 mg ASTA/kg diet and their combination could partially or greatly alleviate the adverse effects caused by AFB1, with the EGM+ASTA group receiving the most effective treatment.  相似文献   

Study on Molecular Chain Morphology of Konjac Glucomannan   总被引：4，自引：0，他引：4  

LI Bin  XIE Bi-jun 《中国农业科学(英文版)》2003,2(7)

The long-range structure of konjac glucomannan(KGM) is studied by using laser light scatter(LLS), gel permeation chromatography (GPC) and method of viscostdity. The weight-average molecularweight (Mw), root-mean-square ratio of gyration[ (S2) 1/2 ], second viral coefficient (A2) and multi-dispersioncoefficient (Mw/Mn) are 1.04× 106, 105.0±-0. 9 nm, (- 1.59±0. 28) × 10-3 mol ml g-2 and 1. 015±0. 003,respectively. Mark-Houwink equation is established as [η] = 5. 96 × 10-2Mw0.73 and the molecular chain pa-rameters are as follows: ML=982.82 nm-1 , Lp=27.93 nm, d=0.74 nm, h=0.26 nm, L=1 054.11 nm.Further more molecular chain morphology of KGM is studied by using atom force microscope (AFM) andtransmission electronic microscope (TEM), and the result shows that the KGM molecular is an extendingsemi-flexible linear chain without branch. Therefore, the image of molecular chain morphology confirms thededuction drawn by Mark-Houwink equation and molecular chain parameters.  相似文献   

脱支链葡甘聚糖单链螺旋构象的研究     

简文杰  熊何健  庞杰 《西南大学学报(自然科学版)》2011,33(11)

目的:研究支链对魔芋葡甘聚糖(KGM)分子螺旋结构的影响规律及脱支链KGM分子链构象形态.方法:采用不同外场条件下真空中分子动力学模拟的研究方法.结果:研究表明支链是维持KGM分子螺旋结构的重要基团,脱支链KGM分子链的螺旋构象是由局部的折叠片段组合而成;脱除支链后的KGM的构象更稳定,且真空中对分子链构象影响最大的非键合作用力仍是静电作用,当温度高于343K时脱支链KGM的螺旋构象消失,分子链呈现直链伸展状态.结论:分子动力学模拟方法是研究脱支链KGM螺旋结构的一种有效手段.  相似文献   

白及/魔芋复合凝胶体系的构建及性能表征     

李彦军  窦欣  赵倩楠  张方剑  赵心梦  严维华  边瑞娜  姚来君  毛跟年 《动物医学进展》2022,43(1):65-70

以白及/魔芋为基质,采用冻融法构建了一种具有抑菌功效的复合凝胶体系。通过单因素试验优化了白及/魔芋复合凝胶体系的制备工艺,利用红外光谱仪、X-射线衍射仪和扫描电子显微镜等对复合凝胶的结构及性能进行了表征,并考察了复合凝胶对大肠埃希氏菌和金黄色葡萄糖菌的抑菌效果。结果表明,当白及与魔芋质量比为3∶1,氢氧化钠浓度2 mg/g,凝胶温度70℃时,制备的复合凝胶性能较好,结构完整,孔隙均匀,吸水率高达1465.4%,透气量为114000.246 g/(m³·h),最大应力为0.68 MPa,抑菌效果明显。白及/魔芋复合凝胶可作为一种具有潜在应用价值的新型抑菌敷料。  相似文献   

黄芩茎叶没食子酸-KGM复合保鲜膜在鸡蛋保鲜中的应用研究     

李乐  张晓虎  杨澜 《中国农学通报》2022,38(35):125-133

为延长鸡蛋货架期，以商洛黄芩茎叶没食子酸作为研究对象制备复合保鲜膜。本研究采用超声辅助乙醇浸提法从黄芩茎叶中提取没食子酸，提取量为203.35 mg/g；对提取出的没食子酸浓缩液进行抑菌实验，研究没食子酸对金黄色葡萄球菌、大肠杆菌、肠炎沙门菌的抑菌能力。结果表明：抑菌效果为大肠杆菌<金黄色葡萄球菌<肠炎沙门菌。在分别探讨没食子酸、魔芋葡甘聚糖、壳聚糖和柠檬酸保鲜作用的单因素试验基础上，采用响应面法，以哈夫单位为响应值对复合保鲜配方进行优化。结果表明：没食子酸1.85%、魔芋葡甘聚糖1.24%、壳聚糖1.96%、柠檬酸3%复配用以制备复合保鲜膜为最佳配比。将此配方制成的复合保鲜膜均匀涂抹在鸡蛋上，在37℃下鸡蛋可以保存15天，鸡蛋的哈夫单位可达到74.86±2.61。所制备的复合保鲜膜绿色、安全，可为鸡蛋的保鲜提供技术参考。  相似文献   

汉中市魔芋产业现状及发展建议          下载免费PDF全文

张万春  高媛  周子凡  廖兴茂  赵芬  史莉娜  瞿利英 《陕西农业科学》2021,(9):90-92

陕西省汉中市是魔芋生产的优生区域，魔芋产业发展经济、扶贫、社会效益明显，但存在科技投入不足、技术到位率低，种芋繁殖体系不全，品牌创建滞后、带动力不强等问题。建议注重研发推广、品种改良、规范化生产、技术培训等以促进品牌创建和示范带动作用，发挥产业优势促进产业扶贫和乡村振兴的发展。  相似文献