A screening test for grain hardness in sorghum employing density grading in sodium nitrate solution     

L. Hallgren  D.S. Murty 《Journal of Cereal Science》1983,1(4):265-274

  相似文献   

葡萄枝条中蛋白质、过氧化物酶活性变化与抗寒性的关系   总被引：1，自引：0，他引：1  

王丽雪  李荣富  张福仁 《内蒙古农业大学学报(自然科学版)》1996,(1)

显微化学观察表明，越冬期间，葡萄枝条组织中的全蛋白含量及其变化动态与抗寒性密切相关。主要表现为全蛋白存在于韧皮薄壁细胞中；在抗寒锻炼过程中蛋白质逐渐增加，严冬时达到最大值；且抗寒种类全蛋白含量高，降解迟。随着秋冬光温的降低，过氧化物酶活性逐渐提高，抗寒种类提高幅度大；韧皮部酶活性高于木质部且稳定性强。过氧化物酶活性的适应性变化，对葡萄抗寒力的发展具有重要作用。  相似文献   

Postharvest Attributes of “Washington Navel” Orange as Affected by Preharvest Foliar Application of Calcium Chloride,Potassium Chloride,and Salicylic Acid     

Asghar Ramezanian  Rahil Dadgar  Fariborz Habibi 《International Journal of Fruit Science》2018,18(1):68-84

ABSTRACT

To evaluate the effects of preharvest foliar application of calcium chloride (CaCl₂), potassium chloride (KCl), and salicylic acid (SA) on postharvest quantitative and qualitative attributes and storage life of “Washington navel” orange, an experiment was conducted during two consecutive years. Solutions including CaCl₂ (1.5% and 3%), KCl (1.5% and 3%), SA (0.015%, 0.03% and 0.045%), and the combination of CaCl₂, KCl, and SA were sprayed on the canopy at the end of the first stage of fruit growth one month after full bloom (fruit diameter was 20 mm) and repeated in late September. The fruits were harvested at commercial maturity stage and were stored at 5°C with 85 ± 5% relative humidity (RH) for 90 days. Quantitative and qualitative characteristics were assessed every month. Preharvest KCl treatment had no significant effect on measured parameters. However, CaCl₂ and SA treatments had the most impact on the quantitative and qualitative characteristics, such as firmness and phenolic content of fruit during storage. The SA treatment enhanced fruit appearance and nutritional value compared to the control but could not prevent the weight loss during storage. The results showed that preharvest spray of CaCl₂, KCl, SA, and their combination had positive effects on storability of “Washington navel” orange fruit during storage. However, the effect of Ca and SA was more. Application of Ca, K, and SA could be beneficial for orange postharvest instead of mixed elements fertilizers.  相似文献   

含水率和发酵时间对以全株玉米为基础的发酵全混合日粮养分的影响     

马晓宇  朱风华  葛蔚  程明  刘宗正  林英庭 《动物营养学报》2019,31(5):2367-2377

本试验研究了含水率和发酵时间对全株玉米发酵全混合日粮(FTMR)发酵品质及养分含量的影响,旨在为FTMR的生产提供参考。试验选用腊熟期全株玉米为主要原料,在保持饲粮精粗比例约为3∶7(干物质基础)的前提下,与干花生秧、混合精料等饲料充分混合配制成含水率为35%的全混合日粮(TMR),然后加水调整TMR含水率分别为40%、45%、50%和55%,将这5种含水率的TMR快速装入塑料密封袋内,压实并抽去空气后密封保存制备FTMR。分别在发酵后的第0、10、20、30、40、50、60、70和80天,测定常规养分含量、发酵指标及霉菌毒素含量。结果表明:5种含水率的TMR在发酵至第80天时感官指标良好,均无发霉现象;发酵初期各组均有涨袋现象,随着发酵时间的增加,涨袋现象逐渐消失;含水率对FTMR常规养分含量影响较小;发酵前20天,pH随含水率的升高而升高,此后随含水率的升高而下降; 45%、50%和55%组具有较高的乳酸含量;乙酸、丙酸含量随发酵时间增加而增加,只在发酵的第10、20、30天检出微量的丁酸;各组均未检出玉米赤霉烯酮、呕吐毒素及黄曲霉毒素B1。综合分析认为,本试验条件下,全株玉米FTMR的含水率以45%和50%为宜,发酵时间不少于40 d。  相似文献   

苜蓿黄酮的生物活性功能及其在反刍动物中的应用     

李苗苗  靳思玉  牛志力  曹阳 《中国饲料》2019,(13):4-8

苜蓿作为畜禽青绿饲料,在动物生产中具有十分重要的价值和地位。其次级代谢产物黄酮类化合物具有杀菌、抗氧化、延缓衰老、抗肿瘤、类雌激素、增强机体免疫力等生物活性功能,在医药领域和畜牧生产中有着十分重要的开发与利用价值。本文系统综述了苜蓿黄酮生物活性功能和提取工艺方面的研究现状,分析造成苜蓿黄酮含量差异的因素,旨在探索加工生产功能性无抗饲料,为发展健康安全的畜产品提供理论参考依据。  相似文献   

菟丝子黄酮对BPA致小鼠睾丸间质细胞分泌雄性激素异常的保护作用     

陶金良  王霄  魏媛媛  秦姣姣  钟秀会  包永占  史万玉 《动物医学进展》2019,(5):71-75

为研究菟丝子黄酮对双酚A(BPA)干扰小鼠睾丸间质细胞激素分泌的缓解作用,以TM3小鼠睾丸间质细胞为对象,采用1μg/mL～500μg/mL的菟丝子黄酮与TM3(小鼠睾丸间质细胞)细胞共同培养24 h,以MTT法检测细胞增殖,确定菟丝子黄酮对TM3细胞的安全剂量。然后采用1μmol/mL～200μmol/mL的双酚A干扰TM3细胞24 h,以MTT法检测细胞增殖,通过TM3细胞的相对存活率,确定BPA最适染毒剂量;最后先用菟丝子黄酮和TM3细胞共同培养4 h后,再用BPA干扰TM3细胞24 h。通过ELISA检测细胞上清液睾酮(T)和黄体生成素(LH)的含量,并分析菟丝子黄酮对BPA干扰小鼠睾丸间质细胞激素分泌的缓解作用。结果表明,250μg/mL～400μg/mL的菟丝子黄酮(等差法)对TM3细胞作用24 h后,有极显著的增殖效果(P<0.01);80μmol/mL的BPA对TM3细胞作用24 h后,细胞存活率为81%,可作为最适染毒剂量;菟丝子黄酮保护4 h后,再用BPA干扰12 h、24 h后,不同浓度的菟丝子黄酮可显著升高TM3细胞睾酮和黄体生成素的水平(P<0.05)。说明菟丝子黄酮对BPA致小鼠睾丸间质细胞睾酮和黄体生成素的分泌异常具有明显的保护作用。  相似文献   

高寒阴湿区6个抗寒紫花苜蓿种质氨基酸积累量分析     

魏双霞  师尚礼  康文娟  谭谌淼 《草原与草坪》2019,39(4):100-106,111

为了评价6个抗寒紫花苜蓿种质(GNKH-1、2和3、俄罗斯西伯利亚杂花苜蓿、金皇后紫花苜蓿和阿尔冈金紫花苜蓿)的种质,在青藏高原高寒阴湿区进行了播种当年的评比试验,并对地上部分叶和茎中的氨基酸含量进行分析。结果表明:氨基酸总量(T)在GNKH-2叶最高(23.86%),在俄罗斯西伯利亚杂花茎中最高(12.13%);必需氨基酸(E)在金皇后叶(8.55%)和茎(4.27%)中最高。供试苜蓿叶蛋白种质从高到低排序为:金皇后>GNKH-1>GNKH-3>GNKH-2>阿尔冈金>俄罗斯西伯利亚杂花;苜蓿茎蛋白品质从高到低排序为:金皇后>GNKH-1>GNKH-2>GNKH-3>俄罗斯西伯利亚杂花>阿尔冈金。综合分析表明,抗寒苜蓿材料中GNKH-1叶和茎蛋白质价值均最高;GNKH-3是抗寒苜蓿材料中氨基酸评分相对最高的,叶部氨基酸评分(AAS)为32.74,茎部为15.94,均高于其他供试苜蓿品系;阿尔冈金和GNKH-1叶部EAAI值最高,分别为1.2860和1.2847;GNKH-2(1.2872)仅次于俄罗斯西伯利亚杂花和阿尔冈金茎部的EAAI值(1.2881,1.2876)。  相似文献   

封育对黄土高原天然草地深层土壤碳、氮储量的影响   总被引：1，自引：0，他引：1  

李建平  谢应忠 《草业科学》2016,33(10):1981-1988

封育是当前恢复和改良退化草地的重要措施,准确评估植被变化过程中土壤碳、氮储量动态,具有重要的生态意义。本研究以宁夏云雾山封育30年天然草地和未封育草地土壤为研究对象,对深层(0-500cm)土壤有机碳(SOC)、全氮(STN)固持动态进行分析。结果表明,封育30年草地土壤碳含量(0-440cm)显著高于未封育草地(P0.05),但是草地SOC变化临界层不明显,未封育草地SOC含量变化临界层大约位于130cm处;封育与未封育草地STN含量在130cm以下显著降低,STN的累积均发生在60-320cm土壤中,而表层(0-60cm)和较深层(320cm)中STN积累较少;封育30年草地340-500cm土壤SOC储量趋于稳定,每20cm土层约为11.5 mg·hm~(-2),未封育草地140-500cm土壤SOC储量趋于稳定,每20cm土层维持在8mg·hm~(-2);封育30年草地0-100cm土壤SOC、STN储量分别占0-500cm土层的44.8%和27.2%,0-200cm分别占72.2%和38.5%,0-300cm分别占83.5%和64%,0-400cm分别占92.2%和80.1%。因此,深层土壤有着大量的碳、氮储量信息,对于100-500cm土壤碳、氮动态研究非常必要。  相似文献   

Herd-level factors associated with longevity in Swedish dairy cattle     

E. Strandberg  U. Emanuelson 《Acta Agriculturae Scandinavica, Section A - Animal Sciences》2016,66(2):92-98

The aim of this study was to find herd-related factors associated with average longevity in Swedish dairy herds. Herds with short or long (bottom or top quartile) total life (from birth, TL, 841 and 839 herds) or productive life (from first calving, PL, 799 and 821 herds) were chosen. A logistic regression model was used to estimate associations between herd type and herd-related factors. Large herds and herds increasing in size by more than 50% were less likely to have long PL. High average milk yield was not a risk factor for short PL, but herds with the lowest yield were more likely to be long PL herds. These herds had lower estimated breeding values for milk, most likely due to a slower herd turnover rate. A high proportion of cows culled early in first lactation had a large effect on the probability of being a short PL herd.  相似文献   

Determination of the minimum infusion rate of propofol required to prevent purposeful movement of the extremities in response to a standardized noxious stimulus in goats          下载免费PDF全文

Jacques P Ferreira  Patience S Ndawana  Loveness N Dzikiti  Brighton T Dzikiti 《Veterinary anaesthesia and analgesia》2016,43(5):519-527

  相似文献