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为了解并掌握吉林省副食品中滴滴涕农药残留量的情况。采用气相色谱法对吉林省长春、吉林、德惠及大安市肉蛋奶鱼中滴滴涕农药残留量监测进行分析。这些地区DDT残留量平均含量猪肉为1.91μg/kg、牛肉为1.88μg/kg、羊肉为2.09μg/kg;鸡蛋为1.34μg/kg,、奶粉为2.30μg/kg、鲜奶为1.59μg/kg鱼为1.72μg/kg。按照《食品中农药最大残留限量》判断,这些地区的肉、蛋、奶、鱼中滴滴涕农药的残留量较低,均不超过国家限值。 相似文献
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《西藏科技》2021,(4)
目的观察藏药九味麝香丸的抗炎和免疫干预药效,为其临床应用提供参考。方法九味麝香丸0.20g/kg、0.10g/kg、0.05g/kg灌胃给予7天,观察药物对二甲苯所致小鼠耳肿胀及小鼠棉球肉芽肿形成的影响;九味麝香丸0.20g/kg、0.10g/kg、0.05g/kg灌胃给予13天,观察药对2,4-二硝基氟苯(DNFB)所致小鼠迟发型超敏反应和鸡红细胞所致小鼠溶血素生成的影响。结果藏药九味麝香丸0.20g/kg、0.10g/kg可抑制二甲苯所致小鼠耳肿胀,耳肿胀度和肿胀率均降低,肿胀度与模型对照组比较差异有统计学意义(P0.05,P0.01),提示其具有抑制急性炎症作用;0.20g/kg可使小鼠棉球肉芽干重降低,与模型对照组比较差异有统计学意义(P0.05),提示其对亚急性炎症也有一定抑制作用;0.20g/kg、0.10g/kg可增强DNFB所致小鼠迟发型超敏反应,0.20g/kg组耳肿胀度和肿胀率均增高,与模型对照组比较差异有统计学意义(P0.05,P0.01)。结论藏药九味麝香丸具有抗炎和免疫增强药效。 相似文献
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馒头是北方的传统面食之一。对影响北方馒头品质的主要因素,包括小麦面粉中蛋白质质量量、淀粉质量、面粉拉度、酶、加水量等各因素进行了较为详细的论述。 相似文献
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馒头是北方的传统面食之一。对影响北方馒头品质的主要因素,包括小麦面粉中蛋白质质量量、淀粉质量、面粉拉度、酶、加水量等各因素进行了较为详细的论述。 相似文献
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富春江（富阳段）表层沉积物中生源物质的分布特征 总被引：1，自引：0，他引：1
针对富春江(富阳段)水污染现状,对富春江(富阳段)的洋浦、永济浦和大源溪三个主要排污口附近的沉积物进行系统研究。结果表明,受污染沉积物的有机质含量为41.6～294.2g/kg,平均为145.3g/kg;凯氏氮含量为1.2～5.2g/kg,平均为2.6g/kg;总磷含量为817-1415μg/g,平均为1050μg/g。沉积物有机质、总氮、总磷水平对研究区底栖生物群落和生态环境构成了较大威胁。沉积物的有机质和凯氏氮含量受排污口影响明显;但沉积物总磷含量受排污口影响不明显。生源物质之间以及生源物质与沉积物理化性质的相关性分析表明,沉积物碳、氮以及粉砂粒存在同源性,沉积物磷与碳、氮以及粉砂粒不具有同源性,关于该区域磷素污染源还需进一步调研确认。 相似文献
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在秋季复种的白菜、萝卜两种作物上进行田间试验,研究增施钾肥对蔬菜产量和品质的影响.结果表明：在基施氮磷等肥料基础上增施钾肥对两种蔬菜均有显著的增产效果.施氯化钾10kg/667m^2和15kg/667m^2,白菜产量分别比对照增产16.2%和18.5%,白菜经济最佳施用量为12.1 kg/667m^2;萝卜施氯化钾10kg/667m^2与15kg/667m^2,产量分别比对照增加33.7%和26.7%,经济最佳施用量为11.7kg/667m^2;白菜和萝卜施氯化钾5kg/667m^2和20kg/667m^2时增产率均较低;施钾对蔬菜干物质、可溶性糖和全氧化钾含量均有提高,氯化钾施用量对这两种蔬菜的品质与产量的影响规律基本一致。 相似文献
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浙江省现有小麦品种的籽粒品质普遍较差,表现为蛋白质含量和面筋含量低,面团形成特性不良,不适合烘烤优质面包,这在很大程度上与生态条件有关,但某些品质性状可通过育种得到改良.文中提出了当前品质育种的目标以及提高品质育种效果的对策。 相似文献
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试验共使用三口面积分别为3亩的池塘,每亩放养雄性率达97%以上的奥尼罗非鱼2200尾,搭配鲢鱼120尾。奥尼罗非鱼鱼种50克以前,投喂饲料的粗蛋白含量为36%,50克以后至商品鱼,投喂饲料的粗蛋白含量为28%。通过定期泼洒生石灰、施用生物制剂等方法调控水质,在不换水条件下饲养212天,结果三口池塘总产鱼量达15823.2公斤,其中奥尼罗非鱼平均产量为1576.0公斤/亩、鲢鱼平均产量为182.1公斤/亩,鱼饲料系数为1.48,折合净收入3758元/亩,投入产出比为1：1.33。试验结果表明,该养殖模式取得的经济效益与生态效益都非常显著。 相似文献
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城市绿化是改善城市生态环境质量的重要措施,栽植行道树也是城市绿化的组成部分。调查观测了北京市行道树生长状况和生境土壤性状,结果表明：行道树根际（0．8～1．2m^3）土壤体积密度在1．55g／cm^3左右,紧实度在2．5～3．0kg／cm^2之间,尚能满足树木生长的基本需求;而树坑外围的路基体积密度大于2．00g／cm^3、紧实度远大于4．5kg／cm^2,树木根系无法生存;行道树国槐根系生长方式有：根系强行生长伸展进入路基、根系及其躯干整体向上生长、根系在狭小的树坑之中蜗居等,并分析了行道树生长及其对城市交通设施及人群的潜在风险。指出了从树木生长发育过程来看,城市道路绿化切忌一味追求“林荫大道”和“见缝插针”栽植行道树的做法。 相似文献
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M. Maneesh Sanjiba Dutta Amit Chakrabarti D M Vasudevan 《Indian journal of clinical biochemistry : IJCB》2007,22(1):138-142
Infertility is well-established harmful effect in chronic alcoholism and so far, there is no effective treatment for this
condition. The study was conducted to determine the effects of alpha tocopherol on ethanol induced testicular injuries in
male albino rats of Wistar strain. Five groups (n=6) of animals were used. Group I served as control. Group II received daily
1.6g ethanol/kg body weight/day for 4 weeks orally. Group III received 1.6g ethanol+80mg alpha tocopherol/kg body weight/day
for four weeks orally. Group IV received 1.6g ethanol/kg body weight for/day 4 weeks and followed by 80mg alpha tocopherol/kg
body weight/day for four weeks orally. Group V received 1.6g ethanol/kg body weight/day orally for 4 weeks, followed by 4
weeks abstinence. Twently-four hours after the last treatment the rats were sacrificed using anesthetic ether. Testes were
removed and used for the estimation of extent of lipid peroxidation and tissue levels of antioxidants and steroidogenic enzymes.
Alpha tocopherol treatment increased the activities of testicularΔ
5, 3β-HSD. Moreover, the treatment was also associated with significant decrease in testicular oxidative stress. Ethanol-induced
oxidative stress and decreased steroidogenesis can be reversed by treatment with alpha tocopherol. 相似文献
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目的:探讨中药牵牛子石油醚、氯仿、正丁醇提取物对小鼠急性毒性。方法:制备牵牛子石油醚、氯仿、正丁醇提取物,采用急性毒性替代法-上下法进行毒性比较。结果:牵牛子石油醚、氯仿、正丁醇提取物均不同程度表现出了急性毒性症状,按生药量计算的半数致死量(LD50)分别是455g/kg,32g/kg,9g/kg。结论:牵牛子不同提取物对小鼠的急性毒性强度为正丁醇部位牵牛子氯仿部位石油醚部位。 相似文献
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《Information processing & management》2020,57(1):102132
The research field of crisis informatics examines, amongst others, the potentials and barriers of social media use during disasters and emergencies. Social media allow emergency services to receive valuable information (e.g., eyewitness reports, pictures, or videos) from social media. However, the vast amount of data generated during large-scale incidents can lead to issue of information overload. Research indicates that supervised machine learning techniques are suitable for identifying relevant messages and filter out irrelevant messages, thus mitigating information overload. Still, they require a considerable amount of labeled data, clear criteria for relevance classification, a usable interface to facilitate the labeling process and a mechanism to rapidly deploy retrained classifiers. To overcome these issues, we present (1) a system for social media monitoring, analysis and relevance classification, (2) abstract and precise criteria for relevance classification in social media during disasters and emergencies, (3) the evaluation of a well-performing Random Forest algorithm for relevance classification incorporating metadata from social media into a batch learning approach (e.g., 91.28%/89.19% accuracy, 98.3%/89.6% precision and 80.4%/87.5% recall with a fast training time with feature subset selection on the European floods/BASF SE incident datasets), as well as (4) an approach and preliminary evaluation for relevance classification including active, incremental and online learning to reduce the amount of required labeled data and to correct misclassifications of the algorithm by feedback classification. Using the latter approach, we achieved a well-performing classifier based on the European floods dataset by only requiring a quarter of labeled data compared to the traditional batch learning approach. Despite a lesser effect on the BASF SE incident dataset, still a substantial improvement could be determined. 相似文献
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P. V. Raj K. Nitesh H. R. Chandrashekhar C. Mallikarjuna Rao J. Venkata Rao N. Udupa 《Indian journal of clinical biochemistry : IJCB》2010,25(2):169-174
To investigate Lecithin for its hepatoprotective activity against D-galactosamine (D-GalN) induced toxicity in freshly isolated
rat hepatocytes and animal models. Freshly isolated rat hepatocytes were exposed to Dgalactosamine (30 mM) along with/without
lecithin (100 μg/ml) and the levels of selected liver enzymes were measured. Thirty six Wistar strain albino rats were used
for the in vivo investigations. Lecithin 50 and 100 mg/kg.b.wt were administered for one week by oral route. Liver damage was induced by
intra peritoneal administration of 400 mg/kg b.wt D-galactosamine. The antihepatotoxic effect of lecithin was observed in
freshly isolated rat hepatocytes at concentration 100 μg/ml and was found to be similar to that of the standard silymarin
used. Its in vivo hepatoprotective effect at 100 mg/kg b.wt was comparable with that of the standard silymarin at 100 mg/kg body weight. Lecithin
was able to normalise the biochemical levels which were altered due to D-galactosamine intoxication in freshly isolated rat
hepatocytes and also in animal models. 相似文献
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灌溉水矿化度对玛纳斯流域棉花生长影响的试验研究 总被引：4，自引：0，他引：4
合理利用咸水资源对缓解干旱区绿洲农业用水矛盾有重要意义。本文于2010年和2011年在石河子大学节水灌溉试验站研究了矿化度为0.87、2、3、4、6、8g/L的咸水对土壤水盐动态和棉花生长及产量的影响。结果表明,咸水灌溉导致土壤剖面持续积盐,棉花叶面积指数减小,干物质积累减少、产量下降;灌溉水矿化度每提高1g/L,产量降低约391kg/hm2;土壤根系层(0～60cm)可溶性盐浓度每升高1g/L,产量降低约861kg/hm2。在灌溉水矿化度2g/L情况下,100cm土层盐分最大累积率2010年为113%,2011年为26%,呈下降趋势,棉花生长、干物质积累及产量受影响较小,可作为该区咸水利用调控参考阈值,指导农业生产。 相似文献