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71.
杉木[Cunninghama lanceolata(Lamb)Hook.]种子富含蛋白质,其含量约占种重的20%左右。蛋白质是贮藏物质之一,氨基酸又是组成蛋白质的前体。因此,贮藏蛋白质水解形成各种氨基酸的速度快慢及量的多少,必将影响新的蛋白合成,从而进一步影响胚的发育和幼苗生长。为此,我们进行了杉木种子萌发期间蛋白质和游离氨基酸变化与种子活力关系的研究。材料与方法 相似文献
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竹席胶合板是竹材人造板生产中历史最长,工艺最成熟、用途最广的一种板材。竹席胶合板的胶合强度一般是木材胶合板的1—1.5倍,其价格仅为木材胶合板的1/2—1/4;竹席胶合板弹性、韧性大,易弯曲,用其制造的出口标准件包装圆桶强度大,耐破性能好,破损率低,使用寿命长;击穿、压溃、自由跌落等指标均优于木材胶合板标准件圆桶;其缺陷为:印刷性能差,吃墨浅,干燥慢,字迹欠清。 相似文献
74.
?zge Turna YILMAZ T. Seval Fatma TOYDEMIR ?smail KIR?AN Banu DOKUZEYLUL Zeynep GUNAY Esra KARACAM 《The Journal of veterinary medical science / the Japanese Society of Veterinary Science》2014,76(12):1595-1601
The analgesic effect of wound
infiltration with bupivacaine was evaluated in cats undergoing bilateral mastectomy.
Twenty-one female cats with mammary gland tumors were anesthetized with propofol and
oxygen-isoflurane anesthesia following premedication with atropine. In the trial group
(Group I; n=11), 30 ml of saline containing 2 mg/kg of bupivacaine was
infiltrated topically into the surgical wound right after removal of the mammary glands,
whereas only saline solution was infiltrated in the control group (Group II; n=10). At the
same time, carprofen (4 mg/kg) was also administered subcutaneously in both groups.
Behavioral signs of pain were monitored during the recovery period after general
anesthesia. In order to examine the behavioral changes associated with acute pain, a
questionnaire was prepared and given to the owners to be completed 4 hr and then 10 hr
after the operation. According to the owners’ anwers to the questionnaire, a pain score
was specified using a “numerical rating scale” for each cat. Although some cats showed
mild to moderate pain, the pain score recorded at 4 hr after the operation was
significantly lower in Group I (P<0.001). No significant difference
was found at 10 hr after the operation between the groups. The incidence of vocalization,
aggression and convulsion within 2 hr after the operation was also lower in Group I. In
conclusion, wound infiltration with bupivacaine before incisional closure provided
reliable analgesia at least 4 hr after bilateral radical mastectomy in cats. 相似文献
75.
Processing contaminants may be defined as substances that are produced in a food when it is cooked or processed, are not present or are present at much lower concentrations in the raw, unprocessed food, and are undesirable either because they have an adverse effect on product quality or because they are potentially harmful. The presence of very low levels of processing contaminants in common foods is becoming an increasingly important issue for the food industry, as developments in analytical techniques and equipment bring foods under closer and closer scrutiny. This review considers the formation of lipid oxidation products, hydrogenation of polyunsaturated fatty acids to prevent lipid oxidation and the associated risk of trans fatty acid formation. The formation of acrylamide in the Maillard reaction is described, as well as the genetic and agronomic approaches being taken to reduce the acrylamide-forming potential of cereal grain. The multiple routes for the formation of furan and associated chemicals, including hydroxymethylfurfuryl, are also described. The evolving regulatory and public perception situations for these processing contaminants and their implications for the cereal supply chain are discussed, emphasising the need for cereal breeders to engage with the contaminants issue. 相似文献
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Antioxidant Activity of Pigment Extracted from Green-Wheat-Bran 总被引:1,自引:0,他引:1
The anthocyanin pigment extracted from green-wheat-bran was studied to identify its antioxidant activity.The antioxidant activities of the pigment were evaluated by anti-lipid peroxidation,total antioxidant activity (TAA),superoxide anion radical scavenging activity (SARSA),active oxygen scavenging activity (AOSA),and DPPH (1,1-diphenyl-2 picrylhydrazyl free radical) radical scavenging activity.The results showed that the pigment had higher antioxidant activity and TAA,SARSA,AOSA and DPPH.scavenging activities at a certain concentration than Vc (antiscorbutic vitamin,vitamin C),and the capacity increased with the increase of pigment concentration.Its TAA was 51.06 U mL-1,1.73 times of Vc,and SARSA 18 025.21 U mL-1,2.26% higher than Vc,and AOSA 3 776.31 U mL-1,1.24 times of Vc.As to the DPPH.scavenging activity of the pigment,there was a trend that higher concentration performed higher activity significantly improved with the company of Vc.The pigment showed significant antioxidant activities evaluated by different assays.Results will provide a better understanding on antioxidant activity of green wheat and allow the screening or breeding of green wheat varieties with higher antioxidant activity for food processing. 相似文献
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本研究旨在观察不同钼水平对山羊红细胞膜自由基代谢及其酶活性的影响。选用27头健康山羊随机分成3组,选用七钼酸铵([(NH4)6Mo7O24·4H2O])作为本试验口服钼源,采用(NH4)6Mo7O24·4H2O水溶液对实验山羊每d1次的方式进行灌服。对照组灌服相应剂量蒸馏水,高钼组山羊按每公斤体质量15mg和45mg(以钼计)灌服(NH4)6Mo7O24·4H2O水溶液(15mg Mo·kg^-1·BW组(Ⅱ组)和45mgMo·kg^-1·BW组(Ⅲ组))。试验为期50d,并于第0、10、20、30、40、50天采血,测定红细胞膜中自由基含量和酶活性变化。结果显示,组内比较,Ⅱ组、Ⅲ组GSH—Px、T—AOC、CAT、GST、T—AOC、ATPase和AKP活性在试验前期(0~30d)差异不显著(P〉0.05),试验后期(40~50d)与前期比较下降,差异显著(P〈0.05);MDA含量、XOD和LDH活性在实验前期(0~30d)差异不显著(P〉0.05),后期(40~50d)与前期(0~30d)比较升高,差异显著(P〈0.05);组间比较,Ⅱ组、Ⅲ组GSH—Px、T—AOC、CAT、GST、T—AOC、ATPase和AKP活性在实验前期(0~30d)与对照组比较差异不显著(P〉0.05),后期(40~50d)与对照组比较降低,差异显著(P〈0.05);MDA含量、XOD和LDH活性前期(0-30d)与对照组比较差异不显著(P〉0.05),后期(40~50d)升高,差异显著(P〈0.05)。由此可见,摄入过量的钼会导致山羊红细胞膜抗氧化功能降低、自由基含量升高和能量代谢障碍。 相似文献
80.
选用5只实验感染肝片吸虫山羊研究Closantel缓释剂对机体抗氧化功能的影响,实验用山羊每只一次性口服肝片吸虫囊蚴150个,感染后第15周随机将山羊分成对照组(n=2)和驱虫组(n=3),驱虫组每羊口服两颗Closantel缓释剂,每周定时采集颈静脉血液,检测血清抗氧化酶的变化,观察服用Closantel缓释剂对其的影响。结果表明投药后山羊血清中GSH-Px、CAT均有不同程度的升高,SOD变化不显著,而脂质过氧化产物MDA含量则下降,提示Closantel的缓释剂型对实验感染肝片吸虫山羊机体的抗氧化产生了影响,对机体有一定保护作用。 相似文献