Effects of dietary carbohydrates sources on lipids compositions in abalone, Haliotis discus hannai Ino

A study was conducted to evaluate the effects of dietary carbohydrates on triglyceride, cholesterol and fatty acid concentrations in abalone, Haliotis discus hannai Ino. Six semi-purified diets with different carbohydrates (dextrin, heat-treated wheat starch, wheat starch, corn starch, tapioca starch and potato starch, respectively), all containing a carbohydrate level of 33.5%, were fed to abalone (initial shell length: 29.98 mm ± 0.09 mm; initial weight: 3.42 g ± 0.02 g) for 24 weeks in a recirculation system. The results indicate that serum triglyceride concentrations were significantly (P < 0.05) higher in the abalone fed with dextrin, heat-treated wheat starch and wheat starch than those fed with corn starch, and serum cholesterol concentrations were significantly (P < 0.05) higher in the abalone fed with dextrin, heat-treated wheat starch than those fed with corn starch. Fatty acid C20:4n-6 in the foot muscles were significantly (P < 0.05) lower in the abalone fed with dextrin than those fed with wheat starch, corn starch, tapioca starch and potato starch. Fatty acid C20:4n-6 in hepatopancreas was significantly (P < 0.05) lower in abalone fed with heat-treated wheat starch than those fed with corn starch, tapioca starch and potato starch. Fatty acid C22:6n-3 in the foot muscles were significantly (P < 0.05) lower in the abalone fed with dextrin and heat-treated wheat starch than those fed with wheat starch and potato starch.     

Effects of Dietary Carbohydrates Sources on Lipids Compositions in Abalone, Haliotis discus hannai Ino

A study was conducted to evaluate the effects of dietary carbohydrates on triglyceride, cholesterol and fatty acid concentrations in abalone, Haliotis discus hannai Ino. Six semi-purified diets with different carbohydrates (dextrin, heat-treated wheat starch, wheat starch, corn starch, tapioca starch and potato starch, respectively), all containing a carbohydrate level of 33.5%, were fed to abalone (initial shell length: 29.98 mm±0.09 mm; initial weight. 3.42 g±0.02 g) for 24 weeks in a recirculation system. The results indicate that serum triglyceride concentrations were significantly (P<0.05) higher in the abalone fed with dextrin, heat-treated wheat starch and wheat starch than those fed with corn starch, and serum cholesterol concentrations were significantly (P<0.05)higher in the abalone fed with dextrin, heat-treated wheat starch than those fed with corn starch. Fatty acid C20:4n-6 in the foot muscles were significantly (P<0.05) lower in the abalone fed with dextrin than those fed with wheat starch, corn starch, tapioca starch and potato starch. Fatty acid C20:4n-6 in hepatopancreas was significantly (P<0.05) lower in abalone fed with heat-treated wheat starch than those fed with corn starch, tapioca starch and potato starch. Fatty acid C22:6n-3 in the foot muscles were significantly (P< 0.05) lower in the abalone fed with dextrin and heat-treated wheat starch than those fed with wheat starch and potato starch.     

海底生物扰动作用及其对沉积过程和记录的影响

海底生物扰动作用主要由底栖生物的摄食、掘穴和栖所建造等活动造成,它可以充分改变沉积物的物理、化学特性,扭曲或模糊地层学信号,影响早期成岩过程和沉积记录以及沉积物的稳定性。海底生物扰动作用的研究,对于全面、精确地掌握海洋中各种物质的生物地球化学循环过程,正确回溯古气候、古海洋和古生态记录,合理调节和控制海底生态系统的多样性具有十分重要的意义。简要回顾了海洋生物扰动作用的研究进展,并着重对海洋沉积物中生物扰动作用的观测和定量研究方法、主要影响因素及其对沉积过程和记录的影响进行了评述。     

基于光学与雷达影像变化检测的2020年鄱阳湖洪灾评估与分析

利用遥感对地观测技术对2020年夏季鄱阳湖地区发生的洪水灾情进行评估和分析,分别选取Landsat 8卫星4月和Sentinel-1A雷达卫星7月的影像作为洪水发生前、后的影像,利用遥感专题信息提取、随机森林分类和变化检测技术揭示洪水淹没范围,以及被淹没的主要土地覆盖类型面积,同时结合水文气象和地形数据进行灾情和受灾原因分析。研究结果表明,鄱阳湖2020年洪灾的淹没面积为1961.95 km²,共造成区内110.83 km²建筑用地、760.54 km²耕地、71.59 km²林地、992.02 km²草地和26.97 km²裸地被淹,其中尤以鄱阳县受灾最为严重,其总受灾面积达到514 km²,其次为新建区与余干县,分别达到了330 km²和310 km²。持续2个月的强降雨使得鄱阳湖流域的水位超过了其1998年特大洪水的水位,加上长江水倒灌,湖区地势北高南低,积水不能及时排出,圩堤决口等诸...     

基于云原生的时空大数据平台设计与实现

作为测绘地理信息工作实现"两支撑、一提升"定位的服务载体、自然资源管理的统一底板、智慧城市的时空基础设施、数字孪生城市的空间数字底盘等,时空大数据平台已成为城市信息化建设不可或缺的内容.时空大数据平台服务领域不断扩大,对其在时空大数据汇聚、融合、管理、共享、分析,以及高可用、高并发、高弹性等方面的要求也不断提升.本文基...     

海岸带土地利用适宜性评价——以杭州湾南岸为例

位于海域—陆域系统交叉和相互作用的海岸带,其土地利用受到自然和人文的多因素共同影响.进行海岸带土地利用适宜性评价对于经济发展迅速的海岸带土地资源的合理配置和开发利用具有重要意义.以2010年杭州湾南岸土地利用数据为基础,利用LandUSEM模型,依据土地利用类型与评价因素不同等级组合的频繁度进行土地利用适宜性评价,计算不同土地利用单因子适宜度及综合适宜度.结果表明:①中等适宜以上占总区域的73.15％,近四分之一位于临界适宜及以下.这说明杭州湾南岸土地利用适宜性较好,各适宜性等级分异情况明显.②杭州湾南岸土地利用适宜性具有较明显的空间分布特点,且余姚、慈溪岸段适宜性情况较镇海岸段好.镇海岸段的中等适宜与非常适宜区面积比例大于余姚和慈溪岸段,临界适宜以上区域面积远小于余姚和慈溪岸段,这与当地的工业结构有关.③各土地利用类型开发程度较适宜,96.45％的城乡建设用地处于临界适宜以上,其中临界适宜占70.91％;89.31％的滩涂用地位于临界适宜以上,且80.72％为非常适宜,可开发潜力大,可将滩涂用地适当适时地转化为农用地或城乡建设用地,以满足区域内经济发展的需求用地.     

光电测距仪室内长基线建立方法研究

光电测距仪器（包括全站仪，以下只简称光电测距仪）既是测量仪器，又是计量仪器，肩负着长度量值传递的任务。量值的准确与否直接影响着测量工作的质量。尤其在目前仪器“黑盒”操作时代，仪器的性能更是整个测量过程的关键，因此要有科学的方法对光电测距仪进行周期性的检定。目前光电测距仪的加常数、乘常数检定采用野外基线。     

Effect of dietary olaquindox on the growth of large yellow croaker (Pseudosciaena crocea R.) and the distribution of its residues in fish tissues

Olaquindox(OLA), one of quinoxaline-N, N-dioxides, has been put under ban. However it was used as a medicinal feed additive early; it promotes the growth of livestock and prevents them from dysentery and bacterial enteritis. In this study, we evaluated the effect of dietary OLA on the growth of large yellow croaker(Pseudosciaena crocea R.) and the histological distribution of OLA and its metabolite 3-methyl-quinoxaline-2-carboxylic acid(MQCA) in fish tissues. Four diets containing 0(control), 42.5, 89.5 and 277.2 mg kg-1 OLA, respectively, were formulated and tested, 3 cages(1.0 m × 1.0 m × 1.5 m) each diet and 100 juveniles(9.75 ± 0.35 g) each cage. The fish were fed to satiation twice a day at 05:00 am and 17:00 pm for 8 weeks. The survival rate of fish fed the diet containing 42.5 and 89.5 mg kg-1 OLA was significantly higher than that of fish fed the diet containing 0 and 277.2 mg kg-1 OLA(P 0.05), while the weight gain rate of fish fed the diet containing 42.5 and 89.5 mg kg-1 OLA was significantly higher than that of fish fed the diet without OLA(control)(P0.05), but similar to that of fish fed the diet with 277.2 mg kg-1 OLA. Fish fed the diet with 277.2 mg kg-1 OLA had the highest content of OLA and MQCA in liver(3.44 and 0.39 mg kg-1, respectively), skin(0.46 and 0.09 mg kg-1, respectively) and muscle(0.24 and 0.06 mg kg-1, respectively). In average, fish fed the diet containing OLA had the highest content of OLA and MQCA in liver which was followed by skin and muscle(P 0.05), whereas OLA and MQCA were not detectable in control. Our findings demonstrated that OLA and MQCA accumulated in large yellow croaker when it was fed with the diet containing OLA, thus imposing a potential safety risk to human health.     

顾及不确定性影响的变形概率预报法

针对变形预报的不确定性,以MCMC算法和贝叶斯预测理论为基础,提出了变形概率预报方法,该方法以概率分布的形式描述变形预报的不确定性,通过概率规则实现预报的递推过程。利用宁杭高速路基沉降数据进行数值计算,定量分析了预报值及其可靠性区间等信息,并与最小二乘估计、免疫算法的预报结果进行比较,结果表明了该方法的有效性和可行性。     

大地测量仪器检定术语的规范化使用

根据计量术语"检定、校准、检验、检查和检测"的定义,分析了检定、校准与检测的异同点,指出计量术语要规范使用,以利于国内及国际间的交流。