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1.
Anakalo Shitandi Aila Oketch Symon Mahungu 《Journal of veterinary science (Suw?n-si, Korea)》2006,7(2):177-180
A Bacillus stearothermophilus var. calidolactis C953 tube test was evaluated for its ability in detecting the residue of selected anticoccidial drugs in poultry, specically sulfamethazine, furazolidone, and amprolium. Various concentrations of each drug were injected into chicken liver and kidney tissues and these tissues were tested to determine the drug detection limits for each drug. The detection limit was defined as the drug concentration at which 95% of the test results were interpreted as positive. The limits of detection in liver tissue were 0.35 µg/ml for furazolidone, 0.70 µg/ml for sulfamethazine and 7.80 µg/ml for amprolium. In kidney tissues, they were 0.30 µg/ml for furazolidone, 0.54 µg/ml for sulfamethazine, and 7.6 µg/ml for amprolium. It was concluded that this tube test could be used to screen for the residue of these three drugs in poultry. 相似文献
2.
Seppo Ahvenjärvi Aila Vanhatalo Pekka Huhtanen Tuomo Varvikko 《Acta Agriculturae Scandinavica, Section A - Animal Sciences》2013,63(3):179-189
Four multiparous dairy cows, fitted with rumen and duodenal cannulas, were fed grass silage and one of four concentrates of barley (B), barley+urea (BU), barley+solvent-extracted rapeseed meal (BRM) or barley+heat-moisture-treated rapeseed cake (BRC). Despite marginal N deficiencies for the control diet (B), BU did not affect milk yield, ruminal fibre digestion or omasal total non-ammonia-N (NAN) or microbial NAN flow. In contrast, BRM and BRC diets significantly increased milk and milk protein yields and omasal dietary NAN flows. Effects of rapeseed meal (RSM) and rapeseed cake (RSC) on milk yield and omasal NAN flow were similar. The diets had no effect on rumen microbial protein synthesis. In general, non-protein N and soluble true protein comprised 0.20 of omasal total NAN flow, for all diets. Supplementary AAT from rapeseed feeds appeared to escape from the rumen as insoluble feed particles. 相似文献
3.
【目的】 研究乙烯与1-MCP处理在7℃冷藏条件下对伯谢克辛甜瓜采后生理品质的影响,为甜瓜采后贮藏保鲜提供理论依据。【方法】 以伯谢克辛甜瓜为原料,分别采用500 mg/L的乙烯和2 μL/L 1-MCP对甜瓜进行处理,每隔24 h测定甜瓜果实硬度、呼吸强度、细胞膜渗透率、可溶性固形物、可溶性糖、还原糖、VC、可滴定酸等品质指标。【结果】 与CK相比,1-MCP可以明显降低甜瓜果实呼吸强度、细胞膜渗透率,保持甜瓜果实硬度,抑制可溶性固形物、还原糖、总糖、可滴定酸、VC含量下降,乙烯处理降低果实硬度,促进果实中可溶性固形物、糖、酸含量和VC含量的下降。【结论】 伯谢克辛甜瓜为乙烯敏感性果实,1-MCP处理能够抑制甜瓜采后呼吸作用,减缓甜瓜果实营养物质的流失,较好的保持甜瓜品质,乙烯处理提高了甜瓜的呼吸强度和细胞膜透性,降低果实硬度,加速了果实采后品质劣变及软化衰老进程。 相似文献
4.
果胶酶澄清和田红葡萄汁工艺研究 总被引：1，自引：0，他引：1
[目的]利用果胶酶对和田红葡萄汁进行了澄清处理,为和田红葡萄汁的工业化生产提供科学依据.[方法]采用单因素试验及正交试验,研究了果胶酶用量、酶解温度和酶解时间对葡萄汁透光率的影响.[结果]果胶酶澄清和田红葡萄汁的最佳工艺条件为:果胶酶用量0.4 g/L、酶解温度45℃、酶解时间150 min.酶解后葡萄汁透光率高达94;以上.[结论]果胶酶澄清和田红葡萄汁效果较理想.澄清汁中不含果胶物质.酶解后营养成分损失较小. 相似文献
5.
针对石榴汁在加工与储存过程中极易褐变的问题,试验研究了石榴汁色素稳定性的影响因素。结果表明,石榴汁色素对温度和pH比较敏感,在较低温度和酸性(pH4)条件下具有较好的稳定性;Ca2+、K+、Na+、Zn2+、H2O2、甜味剂和紫外光对石榴汁色素的影响不明显;Fe3+、Cu2+和Na2SO3会引起石榴汁色素的较大损失;日光照射对石榴汁色素的影响也较大。所以,在石榴汁加工及储存过程中,应在较低的温度下保持一定的酸度,避免高温、光照或与含Fe3+或Cu2+的材料接触。 相似文献
6.
Toini Holopainen Helvi Heinonen-Tanski Aila Halonen 《Water, air, and soil pollution》1996,87(1-4):111-130
The occurrence and condition of Scots pine mycorrhizas were studied at different distances from a pulp mill in Central Finland. The chemical analyses of the soil humus layer in the vicinity of the mill revealed increased levels of ammonium-nitrogen, sulphur and calcium but unaltered concentrations of phosphorus and magnesium. Higher nitrate levels and nitrification were clearly detected at some sites which had recently been limed. Significant decreases in root ramification index and number of living mycorrhizas were found in a zone 0–0.6 km zone surrounding the factory but these parameters increased with increasing distance. Within a 2 km zone around the mill there were abundantCenococcum geophilum andPaxillus involutus-type mycorrhizas while lowered frequencies of several other mycorrhizal types were detected. An ultrastructural study revealed changes in several types of mycorrhizas, the clearest of which were increased tannin deposition in cortical cells, intracellular growth of hyphae in cortical cells and the appearance of electron dense accumulations in the vacuoles of the fungal cells. The ultrastructural changes observed were distributed at least to a distance of 3 km from the mill and occurred in the roots of trees that had only a slight loss of needle mass. Nitrogen deposition is suspected to be the primary cause of root decline but atmospheric S02 through the tree crown is also likely to be a contributing factor. 相似文献
7.
从截留分子量为30 kDa的再生纤维素膜,孔径为0.2μm的聚偏氟乙烯膜、聚四氟乙烯膜、聚醚砜膜中筛选耐乙酸乙酯腐蚀的膜材料及提取液膜纯化的工艺条件。结果表明,截留分子量为30 kDa的再生纤维素膜是番茄皮色素提取液纯化的最适膜材料,纯化过滤最优条件为:压力0.10 MPa、温度35℃。应用膜分离技术纯化番茄皮色素提取液可使杂质截留率平均达到60%以上,而色素损失率在10%以内。 相似文献
8.
以新疆和田酸石榴为原料加工石榴汁,采用不同孔径的陶瓷微滤膜对石榴汁进行除菌过滤,对比不同孔径(0.10、0.22、0.45μm)微滤膜的膜通量、石榴汁除菌率、营养成分含量及色值等指标的变化,确定适于石榴汁过滤除菌的陶瓷微滤膜的孔径与最佳工艺参数。结果表明,用于石榴汁过滤除菌的陶瓷微滤膜的适宜孔径为0.22μm;最佳工艺参数为:过滤压力0.20 MPa,料液温度20℃。在此条件下,陶瓷微滤膜过滤的石榴汁可保持较高的膜通量,有效去除果汁中的悬浮物和有害微生物,较好地保留营养成分,石榴汁在120 d储藏过程中的色泽变化轻微。陶瓷微滤膜过滤除菌可以作为一种除菌工艺代替石榴汁加工中的传统热杀菌工艺。 相似文献
9.
果胶酶澄清哈密瓜汁工艺研究 总被引：2，自引：0，他引：2
[目的]研究果胶酶对哈密瓜汁的澄清效果.[方法]以透光率、果胶含量为衡量澄清效果指标,同时考察澄清前后果汁可溶性固形物含量和其中成分的变化,通过单因素及正交实验,研究酶加入量、酶解时间、酶解温度、酶解pH值对澄清效果的影响.[结果]各因素对澄清效果影响次序为果汁pH值＞果胶酶添加量＞酶解时间＞酶解温度;最佳工艺条件为:酶添加量0.02;、酶解pH值4.0、酶解时间1.0 h、酶解温度30℃.澄清后果汁透光率达到97;,可溶性固形物含量略有上升,果胶含量降低97.5;,蛋白质含量降低92;,总糖、总酸和VC含量无明显变化.[结论]果胶酶能有效去除哈密瓜汁中的果胶物质,澄清效果理想. 相似文献
10.