多山梨醇酯对玉米秸秆体外发酵活力的影响     

陈勇  张慧玲  姜艳美  杨开伦  贺三刚  潘榕  罗靖  雒秋江 《家畜生态》2007,(3)

采用体外培养技术研究添加0.2%的多山梨醇酯20、40、60和80对玉米秸秆体外发酵活力的影响。结果表明:多山梨醇酯60和多山梨醇酯80能够显著提高玉米秸秆体外发酵24h的累积产气量。与对照组相比,多山梨醇酯60组和多山梨醇酯80组24h累积产气量分别提高5.68%(P<0.05)和9.02%(P<0.05)。添加多山梨醇酯对玉米秸秆的发酵模式没有显著影响,但添加多山梨醇酯60和多山梨醇酯80可增强玉米秸秆在体外的发酵强度。除多山梨醇酯20外,添加其它多山梨醇酯使玉米秸秆干物质降解率较对照组提高5.2~8.1%(P<0.05),有机物降解率有提高的趋势。在发酵24h结束时,添加多山梨醇酯40、60和80均使氨态氮浓度下降,还原糖和MCP升高,对pH和总挥发性脂肪酸无影响。其中,多山梨醇酯60和多山梨醇酯80组还原糖浓度分别比对照组提高7.54%(P<0.05)和7.26%(P<0.05)。多山梨醇酯80组MCP较对照组提高15.93%(P=0.061)。在体外培养条件下,多山梨醇酯60和80可促进玉米秸秆的降解。这说明,多山梨醇酯60和多山梨醇酯80可作为一种新型的反刍动物瘤胃发酵调控剂。  相似文献   

高校试卷分析系统设计与实现   总被引：2，自引：0，他引：2  

葛华  张传宏 《农业网络信息》2007,(7):104-105,137

本文根据学生的试卷成绩进行试卷分析,软件可以算出考试成绩中的每个指标.并在Dephi中利用OLE技术实现打印功能.  相似文献   

“中国园艺学会十届二次理事会暨学术研讨会”预备通知     

ZHAO Yu-hua  GE Xue-lin  YANG Xia  WEI Ling  CAI Gui-ying 《园艺学报》2007,34(3):548-552

AIM:The aim of the present study is to investigate changes of five biochemical markers of bone turnover during the formation of ovariectomized rat model. METHODS:Three-month-old female SD rats were divided randomly into ovariectomized (OVX) group, sham-operated (sham) group and control group. Five biochemical markers of bone turnover levels, including serum osteocalcin (OC), total alkaline phosphatase (ALP), bone-specific alkaline phosphatase (BALP), tartrate-resistant acid phosphatase (TRAP) and hydroxyproline (HYP) were measured before and at 1, 1.5, 2, 2.5, 3 and 4 months after surgery. The right proximal tibias of rats were excised at the same time point for histopathological observation. RESULTS:Serum OC, ALP, BALP, TRAP and HYP levels in OVX group were significantly higher than that in sham group. As regard to the time of peak level arrived, the sequence of changes was as follows: TRAP/HYP→OC→ALP/BALP. There was a significant positive correlation between five markers. The pathological changes of trabecular bone in OVX group were only observed 3 months after surgery. CONCLUSION:The results suggest that postmenopausal osteoporosis has a high bone turnover rate. During the formation of ovariectomized rat model, changes of bone resorption markers precede changes of bone formation markers. Serum OC, ALP, BALP, TRAP and HYP are sensitive to evaluate the bone loss in the earlier stage of postmenopausal osteoporosis.  相似文献   

轻简水肥一体化系统设计与实现     

刘炳铄  兰鹏  魏珉  葛成恺  宋新财  孙丰刚 《节水灌溉》2021,(2):75-79

针对小规模农业灌溉应用中对水肥一体机高精度及低成本的需求,设计了一套轻简型水肥一体化系统.为实现精准水肥比例调控,系统可根据用户输入的标准水肥比和测量实时水速,利用脉宽调制技术通过改变占空比来调控肥速,直至满足水肥比误差要求.为降低测量误差的影响,设计中对传感器所测流量及水肥比例调控过程进行修正补偿,提高水肥调控精度.此外,提供了触摸屏和远程APP两种控制模式,操控方式简单,用户只需根据实际情况输入灌溉水肥总量,系统即可自动完成控制过程.结果表明,所设计的轻简水肥一体系统在不同水肥比例要求下,水肥配比精度高,运行稳定,可实现精准施肥灌溉.  相似文献   

TiO₂改性MQ硅树脂热稳定性的研究   总被引：1，自引：0，他引：1  

向洪平  葛建芳  郑扬帆  周学廉 《仲恺农业工程学院学报》2011,(4):37-40

以钛酸酯为前躯体,采用溶胶-凝胶法合成了TiO2改性的MQ硅树脂.就前躯体、MQ硅树脂及物料比对改性树脂热稳定性的影响进行了研究.同时,采用傅立叶红外光谱(Fourier Transform Infrared Spectrometer,FT-IR)对材料的分子结构进行了表征,采用热重分析(Thermogravimetric Aanlysis,TGA)对材料的热稳定性能进行了测试,采用扫描电镜(Scanning Electron Microscope,SEM)对材料的表面形貌进行了扫描.结果表明,TiO2改性MQ硅树脂体系中存在Ti-O-Si共价键;当m(钛酸异丙酯)∶m(MQ硅树脂)=3∶5时,改性树脂的热稳定性最佳;改性树脂粒子颗粒大小约为100 nm左右.  相似文献   

长白山不同海拔蓝靛果忍冬AFLP遗传多样性分析     

葛丽丽  李伟  薛俊刚  其其格  高新  张启昌 《北方园艺》2021,(18):48-53

以吉林省长白山地区4个海拔梯度(600、1000、1400 m和1800 m)的野生蓝靛果忍冬为试材,采用AFLP分子标记技术,研究了不同海拔梯度野生蓝靛果忍冬间的遗传多样性,以期为蓝靛果忍冬野生资源的保护与利用和优质种质资源的选育提供参考依据.结果 表明:野生种群间Nei基因多样性指数和Shannon信息指数的均值分别为0.4675和0.6602.总基因多样度为0.4620,基因分化系数为0.0065,说明总体上不同海拔种群间遗传多样性较高.各种群遗传多样性从高到低依次为1400、1000、680m和1800m.基于遗传距离通过非加权组平均法(UPGMA)将4个海拔种群分为2组,其中低海拔600m和1000m一组;高海拔1400m和1800m一组.  相似文献   

水分管理对镉轻度污染农田水稻镉积累的影响   总被引：1，自引：0，他引：1  

葛颖  马进川  邹平  潘建清  陈丽芬  石其伟  马军伟 《灌溉排水学报》2021,(3)

【目的】研究镉轻度污染农田水稻适宜的水分管理模式。【方法】采用盆栽试验,分别设置水稻全生育期湿润灌溉(CK)、全生育期淹水(T1)、拔节期(T2)、孕穗期(T3)、抽穗扬花期(T4)、灌浆乳熟期(T5)、蜡熟期(T6)开始淹水7个处理,对水稻不同器官镉积累差异以及土壤氧化还原电位、根际土壤溶液水溶性镉质量分数变化进行研究。【结果】土壤氧化还原电位与水溶性Cd呈极显著正相关(p<0.01),淹水后土壤的氧化还原电位(Eh)显著降低,土壤还原性增强,淹水时间越长氧化还原电位越低,其中T1处理最低可降至-159.78mV,淹水后根际土壤溶液中水溶性Cd也迅速下降,T3处理下降最多,为75.0%。不同水分管理模式下水稻糙米含镉量均未超过食品安全国家标准规定的限量值(GB2762—2017)。与CK相比,T1处理降低稻米含镉量达76.9%,而水稻产量明显下降,减产19.2%;T6处理明显抑制镉从水稻根系向地上部分转移,增加根系镉质量占比15.2%;T6处理降低水稻茎秆的镉积累,降低茎秆镉质量占比13.0%;淹水通过抑制镉从水稻叶片向谷物的转移来降低稻米镉积累,与CK相比,T5处理叶片镉质量占比增加5.0%,T3处理谷物镉质量占比降低4.3%。【结论】综合考虑水稻产量、稻米含镉量和田间农事操作习惯,镉轻度污染稻田推荐的水分调控方式为抽穗扬花期淹水至收获前1周。  相似文献   

江苏省农业科技成果转化机制及其创新——以江苏省农业委员会项目为例     

王力坚  杜永林  葛自强  孙成明  刘涛  陈瑛瑛 《湖北农业科学》2014,(13):3221-3224

在介绍农业科技成果转化概况的基础上,重点分析了江苏省农业科技成果转化主体、实施的转化项目以及相应的运行机制,并提出了进一步的创新发展思路,以期为提高江苏的农业科技进步贡献率提供依据,并为其他地区提供借鉴。  相似文献   

Scale‐dependent effects of isolation on seasonal patch colonisation by two Neotropical freshwater fishes     

Jerry Penha  Karlo Y. P. Hakamada  James E. Hines  James D. Nichols 《Ecology of Freshwater Fish》2019,28(2):274-284

The metapopulation paradigm has been central to improve the conservation and management of natural populations. However, despite the large number of studies on metapopulation dynamics, the overall support for the relationships on which the paradigm is based has not been strong. Here, we studied the occupancy dynamics of two Neotropical fishes (i.e., Pimelodella gracilis and Leporinus friderici) to investigate two fundamental premises of the metapopulation paradigm, that is, that isolation and area/habitat quality affect colonisation and extinction probabilities in predictable ways. In order to do this, we used a modification of occupancy models that allows modelling the probability of a site's occupancy as a function of the occupancy of its neighbourhood. We found a weak positive effect of neighbourhood occupancy on P. gracilis colonisation, which is consistent with the propagule rain metapopulation, that is, colonists arriving from outside the studied system. However, we found a strong negative neighbourhood effect on extinction probability, suggesting that declining populations from stream sections are rescued from extinction by neighbouring patches. In contrast, the effect of neighbourhood occupancy on the metapopulation dynamics of L. friderici was in the opposite direction, affecting positively colonisation but not affecting extinction rates, which is consistent with the classical metapopulation model. In addition, the occupancy dynamics of both species were affected by water velocity. To our knowledge, this is the first study to link directly dispersal to local population dynamics in Neotropical fishes, and one of the few studies doing inferences on spatial population dynamics based on direct estimates of neighbourhood occupancy.  相似文献   

枸杞的生物学功能及其在动物生产中的应用     

葛影影  何国戈  郑经成  胡克科  别又才 《安徽农业科学》2021,49(3):25-27

枸杞是一种传统的药食兼用型中药,属于茄科枸杞属灌木植物.枸杞的主要生物活性物质有枸杞多糖、甜菜碱、枸杞色素等,具有抗菌、抗氧化、降血糖、免疫调节等生理功能.枸杞及其提取物、枸杞粉、枸杞渣等作为功能性饲料添加剂在动物生产中的研究已有报道,应用价值高、开发前景广.综述了枸杞的主要活性成分及生理功能,枸杞在动物生产中的实际应用,旨在为枸杞的合理开发利用提供参考.  相似文献