废纸回收材料化利用研究进展     

郑彬炜  章伟伟  关丽涛  古今  胡传双 《林产工业》2020,57(1):5-7

简述了国内外废纸回收利用现状,重点阐述了废纸在建筑填料、制备高附加值纤维衍生物以及复合材料等方面的利用研究现状,并针对废纸材料利用过程中存在的高吸水率和弱结合界面等问题提出了相应的解决方法和研究方向。  相似文献   

乳制品与补锌     

巫庆华  龚广予 《乳业科学与技术》2001,24(1):7-8

目前我国存在一定程度的锌缺乏现象，可以乳制品为载体，有效的增加锌的吸收量。  相似文献   

甲苯侧链催化氯化产物分布的研究     

唐薰  邓凤其 《湖南农业大学学报(自然科学版)》1996,23(6)

研究了催化氯化的产物分布，试验了有关条件对产物分布的影响。结果表明：氯化程度是产物分布的主要影响因素；温度的提高，有利于苄叉二氯和苄川三氯的生成；铁离子、低温及水会导致环上的氯化；水引起水解的发生。  相似文献   

Effects of sodium ferulate on the nonenzymatic glycation and oxidation in kidneys of diabetic rats     

ZHAO Tong-feng  DENG Hua-cong  ZHAO Jiang-pei 《园艺学报》2004,20(9):1697-1701

AIM: To investigate the blocking effects of sodium ferulate (SF) on the nonenzymatic glycation and oxidation in kidneys of diabetic rats. METHODS: The diabetic rats induced by streptozotocin (STZ) were treated with SF (110 mg/kg) per day for 8 weeks. The renal weight/body weight, clearance rate of creatinine (Ccr), proteinuria, advanced glycation end products (AGEs) in renal cortex, and the malonyldialdehyde (MDA), fructosamine (FMN), antioxidant enzymes in serum and renal cortex were measured. The pathologic changes of kidneys were also observed. RESULTS: The levels of Ccr, proteinuria, FMN and AGEs in renal cortex, FMN in serum, and renal weight/body weight in diabetic control group were significantly higher than those in normal control group. In the diabetic control group, there was a highter level of MDA and a lower activity of superoxide dismutase (SOD) and catalase (CAT) in serum and renal cortex than those in normal control group. Except for FMN in renal cortex, the abnormalities were significantly ameliorated in the treatment group. The pathologic changes was significant in the diabetic control group, which was significantly ameliorated with the treatment of SF. CONCLUSIONS: SF protects the activity of antioxidant enzymes, clears away oxygen radicals and inhibits the deposit of AGEs in kindey, which may be the mechanisms of protecting effects of SF on kindey in diabetic rats.  相似文献   

华北农牧交错带退化草地土壤种子库动态变化   总被引：4，自引：4，他引：4  

邵新庆  王堃  吕进英 《草业科学》2005,22(11):8-12

对华北农牧交错带不同退化演替阶段土壤种子库的数量和物种组成及与地上植被的关系进行了初步的研究,结果表明:农牧交错带草地在刈割和放牧等干扰下,发生逆行演替,土壤种子库中植物种类及种子数量呈递减的趋势,轻度退化类型土壤种子库物种组成最高,有23种植物,种子数量最多,有4 303粒,禾本科所占比例较大,为32.3%;而极度退化草地物种组成最低,有14种植物,种子数量仅有1 156粒,禾本科只占8.4%.草地逆行演替过程中植被与土壤种子库在物种组成上存在一定差别,中度退化阶段差别最大,有18种植物未在种子库中出现,极度退化阶段差别最小,有2种未在种子库中出现.  相似文献   

基于食物安全视角的我国畜产食品进口依赖性风险评价     

吴渊  高颂  高雅灵  林慧龙 《草业学报》2018,27(10):171-182

新时期下,保障我国畜产食品供给安全是保障我国食物安全的重要内容之一,而“适度进口”是保障我国畜产食品供给安全的重要途径之一。如何才算“适度进口”,需对畜产食品进口的相关风险进行分析方可评判。运用进口依赖性评价模型对我国猪肉、鸡肉、羊肉、牛肉、鲜牛奶的进口依赖性风险进行分析发现,上述5种畜产食品均存在进口依赖性风险。其中,猪肉的风险来自美国、德国、丹麦、西班牙和加拿大;鸡肉的风险来自美国、巴西、阿根廷和波兰;羊肉的风险来自澳大利亚、新西兰和乌拉圭;牛肉的风险来自乌拉圭、澳大利亚、新西兰、阿根廷和加拿大;鲜牛奶的风险来自德国、法国、新西兰和澳大利亚。为降低我国畜产食品进口依赖性风险,短期内应采取畜产食品进口市场多元化策略以及用进口饲草料替代进口畜产食品的进口方式;长期应在保障“口粮安全”的前提下,调整农业结构,大力发展草地农业,减少对国际市场的依赖性。  相似文献   

Effect of sweet potato vines on performance parameters and some carcass characteristics of rabbits          下载免费PDF全文

A. C. K. Klinger  L. P. da Silva  G. S. P. de Toledo  B. Galarreta  F. Goulart 《Journal of animal physiology and animal nutrition》2018,102(1):152-156

Conventional feedstuffs in Brazil are expensive, which has led to the search for less conventional cheaper and locally available feedstuffs. Thus, this study was carried out to determine the dietary effect of dry sweet potato vines (SPV) on the performance and some carcass characteristics of rabbits. A total of twenty‐seven weaned White New Zealand rabbits (14 male and 13 female) 35 days old with an average initial weight of 755 g were allocated into three treatments. Nine rabbits were assigned to each treatment in a completely randomized design. Three diets were formulated to similar protein and energy levels: 0SPV – diet without inclusion of dry sweet potato vines; 10SPV – diet with 10% alfalfa hay replaced by dry sweet potato vines; and 15SPV – diet with 15% of alfalfa hay replaced by dry sweet potato vines. The experiment lasted for 49 days during which data for feed intake and body weight were recorded. The daily feed intake ranged from 73.17 to 78.02 g; daily weight gain from 22.32 to 23.17 g; feed conversion ratio (FCR) from 3.16 to 3.49 and final live weight ranged from 1839.44 to 1880.55 g. None of the evaluated performance parameters as well as carcass weight, heart weight and percentages of fat and protein in meat were significantly affected by any of the tested dietary treatments. However, the liver weight was statistically lower in animals fed the diets containing 10% of SPV, mainly due to lower glucose content. Glycogen within the tissue, did not differ significantly among treatments. It was therefore concluded that up to 15% of SPV can successfully be included in the diet of rabbits as a cheaper replacement for alfalfa hay without adversely affecting performance.  相似文献   

基于冗余分析的高寒草原土壤与草地退化关系   总被引：2，自引：0，他引：2  

魏卫东  刘育红  马辉  李积兰 《草业科学》2018,(3):472-481

在高寒草原退化草地设置研究样地,观测植物群落特征、采集土壤样品、分析土壤物理化学性质,依据数量生态学基本原理,探讨高寒草原退化草地与土壤因子间关系。结果表明:不同退化程度样地沿冗余分析排序图第一排序轴分布,第一排序轴反映草地退化程度的变化;草地植物群落中与第一排序轴负相关且按相关程度大小排序的指标为盖度>地上生物量>地下生物量;第一、第二排序轴能够解释97.1%的土壤因子与草地退化关系;土壤沙砾、p H与第一排序轴正相关,土壤有机碳、土壤含水量、容重、全氮、有效氮与第一排序轴负相关;第一排序轴及所有排序轴所反映的土壤因子均与草地退化之间呈极显著相关关系(P<0.01);不同土壤因子与草地退化之间相关程度不同,土壤有机碳(r=-0.890)、土壤含水量(r=-0.864)、容重(r=-0.847)、全氮(r=-0.836)、有效氮(r=-0.821)等与高寒草原退化相关程度更高且相关关系极显著(P<0.01)。利用退化草地群落特征和土壤因子数据矩阵进行冗余分析能够较好地综合反映土壤因子与草地退化之间的关系及相关程度,土壤有机碳、土壤含水量、容重、全氮、有效氮是反映高寒草原退化的重要土壤指标。  相似文献   

一种脱水洋葱制品中微生物菌落总数的检测方法     

刘敏  李国鹏  张文征 《安徽农业科学》2015,(29)

建立一种准确检测脱水洋葱制品中菌落总数的方法.利用离心法对出口脱水洋葱制品中沙门氏菌进行预富集,以提高国标检测方法的致病菌检出率,弥补国标方法的不足,并对该方法的准确度进行评价.试验结果表明,样液中菌体经过高速离心后,99％以上的菌体可以从样液分离.与标准方法比对,高速离心法很好地解决了脱水洋葱粉样液中的抑菌成分的干扰,结果可靠准确,基本满足国标中食品安全标准要求,具有一定的实际推广意义.  相似文献   

农产品储运环境实时监测系统设计     

施荣华  李长斌  王国才  郭旭  李尹 《湖南农业大学学报(自然科学版)》2015,(1):48-50

农产品运输车辆和储存仓库的内部温湿度等环境和位置参数是农产品物流调度管理的重要依据，综合使用物联网、无线传感器网络、GPRS无线通信、GSM短信、GPS、GIS等技术与方法，构建一个一体化的农产品储运环境的远程实时监测系统。  相似文献