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991.
分析了乡镇土地利用总体规划编制存在的问题,探讨了乡镇土地利用总体规划编制的技术思路、技术要点,例举了应用实例,可供乡镇土地利用总体规划编制参考。 相似文献
992.
993.
无氮日粮纤维水平对猪内源氨基酸测值的影响 总被引:4,自引:0,他引:4
以醋酸纤维素为纤维源配制成粗纤维水平分别为2.0%、5.0%、8.0%的3种无氮日粮,采用3头回—直肠吻合猪,分3期试验,通过3×3拉丁方设计研究在等进食量(750g/d)条件下日粮的纤维水平对回—直肠吻合猪消化道内源氨基酸测值的影响。结果表明:除缬氨酸、异亮氨酸和胱氨酸外,无氮日粮的粗纤维水平对回肠末端食糜干物质中其他内源氨基酸含量(%)无显著影响(P>0.05)。而对回肠末端内源氨基酸的总排泄量影响显著(P<0.05)或极显著(P<0.01)。相关分析表明,粗纤维水平与各种内源氨基酸的排泄总量之间存在显著(P<0.05)或极显著(P<0.01)的强相关关系,随无氮日粮中粗纤维水平的升高,各种内源氨基酸排泄量呈直线增加。 相似文献
994.
运用数据采集器,配置超声波料位测量系统,实现现代粮仓粮位的高可靠性、高性能价格比的自动监测功能。 相似文献
995.
针对沸喷性油品燃烧时产生沸溢喷溅的原因、规律和特点进行了详细的论述,并结合实际灭火经验,提出了灭火的最佳时机及防止沸溢喷溅的具体方法,采用液下喷射泡 灭装置不受油罐爆炸的影响,能有效地控制火箭。 相似文献
996.
《中国油料作物学报(英文)》2023,8(2):104-110
Fusarium wilt is a common fungal disease in sesame caused by Fusarium oxysporum f. sp. sesami (FOS). To determine the toxin production profiles of the FOS isolates with different pathogenicity levels under various culture conditions, we assessed the content variation of fusaric acid (FA) and 9, 10-dehydrofusaric acid (9, 10-DFA) produced by the four representative FOS isolates. Results indicated that the concentration of FA reached to a maximum of 2848.66 μg/mL in Czapek medium, while 9, 10-DFA was mainly produced in Richard and Low-carbon Richard medium. The concentration of 9, 10-DFA on Richard culture medium varied from 0 μg/mL to 716.89 μg/mL. Of the five culture media used in this study, Czapek culture medium was the most conductive to produce FA. FA production was significantly affected by culture medium, culture time, and their interactions. Results suggest that there is no correlation between toxin production and pathogenicity level of FOS isolates. These findings provide key information for the mechanism analysis of FOS- sesame interaction and pathogen control. 相似文献
997.
Toxicity of aflatoxin B1 (AFB1) was investigated in juvenile hybrid sturgeon Acipenser ruthenus ♂ × A. baeri♀, an important coldwater finfish farmed in China and other countries. Seven experimental diets (Diet A–G) containing different levels of AFB1 (0, 1, 5, 10, 20, 40 and 80 μg kg?1 diet) were fed to juvenile sturgeon weighing 10.53 ± 0.17 g kg?1 to determine its effect on survival, growth, feed consumption, hematocrit, liver histology as well as muscular and hepatic toxin accumulation. The experiment lasted for 35 days and was conducted in two periods of 25 and 10 days each. No external changes or unusual behaviour was observed in the fish fed diets with AFB1. Mortality was observed in fish fed with highest levels of AFB1 (80 μg kg?1– Diet G) from day 12 onwards. After 25 days, fish fed the diet of 80 μg AFB1 kg?1 showed significant lower survival (50 ± 5.77%) followed by those fed 40 μg AFB1 kg?1 diet (80 ± 5.77%) and 20 μg AFB1 kg?1 diet (86.66 ± 3.33%). No significant difference was observed in specific growth rate (SGR) or hepatosomatic index (HSI) between groups. Hematocrit was significantly higher in the fish fed the diet of highest AFB1. The fish were weighed at day 25 in some treatments (Diets F and G) because of high mortality. However, feeding was continued for another 10 days to observe mortality or behavioural changes if any in the other groups. After 35 days, survival in the fish fed Diet F (40 μg AFB1 kg?1) was 40% and those fed Diet E (20 μg AFB1 kg?1) was 36.2%. Significant histopathological changes including nuclear hypertrophy, hyperchromasia, extensive biliary hyperplasia, focal hepatocyte necrosis and presence of inflammatory cells were observed in the liver of fish fed high levels of aflatoxin (40 and 80 μg kg?1). AFB1 accumulation in fish muscle and liver increased with increased dietary AFB1 levels. It could be confirmed that 10 μg AFB1 kg?1 diet was the maximum allowable level in hybrid sturgeon diet. 相似文献
998.
Masashi Ando Manabu Seoka Yoshio Mukai Mok Wen Jye Shigeru Miyashita Yasuyuki Tsukamasa 《Aquaculture Research》2011,42(4):516-524
Tuna muscle often contains high levels of mercury, and fish samples with mercury concentrations ten times higher than the specified safety standards have been reported. Here, we report on the relationship between water temperature and the concentration of mercury in the tail muscle tissue of cultured bluefin tuna Thunnus orientalis. The fish used in this study were cultured at Fisheries Laboratory of Kinki University (Amami Experimental Station, Kagoshima, Japan). One hundred fish weighing 26.2–89.4 kg were selected for analysis between February 2007 and January 2008. Water temperature during rearing ranged from 21 to 29 °C. The total mercury levels were measured using the reduction vaporizing atomic absorption method after acid digestion. Body weight increased approximately 1.5 times that observed in a previous study, despite feeding activity either being the same or less than that observed previously. The average mercury concentration in white muscle was 0.353 mg kg?1, remaining almost constant and independent of body growth. Unlike previous studies, seasonality was not observed in this study. Based on these findings, water temperatures within a certain range were considered to stabilize feeding activity and increase feeding efficiency. Consequently, water temperature is considered to have a moderating effect on seasonal fluctuations in muscle mercury concentrations in cultured bluefin tuna. 相似文献
999.
四明湖水库浮游生物现状调查及评价 总被引:2,自引:0,他引:2
2006-2007年分4次对余姚四明湖水库水质理化指标、浮游生物群落结构进行了调查,并进行了多样性指数分析及渔产潜力估算。结果表明,四明湖水库浮游植物种类共计8门、47种(属),其中以绿藻为最优势类群,占总密度的36.2%;浮游动物共计3大类、30种,其中原生动占40%;浮游植物年均生物量为10.20mg/L,浮游动物年均生物量2.36mg/L。从水体理化指标数据来看,四明湖水库水质属于II~IV类;从浮游植物群落结构和多样性指数分析结果来看,水库属于富营养水平;根据相关公式估算四明湖水库的鱼产潜力为2076kg/hm2。 相似文献
1000.