谈谈鲑鱼饲料的天然色素

类胡萝卜素中,尤其虾青素(astaxanthin)是鲑鱼肉桃红色的主要成分。据分析,天然鲑鱼肉中类胡萝卜素的99％以上是虾青素,余下不到1％是与此相类似的斑螯黄(canthnxan-thin)。自然界中鲑鱼依靠摄取小型甲壳类和其他无脊椎动物中的虾青素,使肉变成桃红色。然而,人工养殖的天然原料少,鲑鱼体内又没有合成虾青素能力。因此,为提高养殖鲑鱼的商品价值,配合饲料中必须含有足量的虾青素。     

水产饲料中添加卵磷脂的效果

卵磷脂是精制豆油时的副产物,故又名大豆卵磷脂。目前市售的卵磷脂产品有含量为50%左右的液体卵磷脂和含量为97%左右的脱脂卵磷脂(deoi Ied Ieci thin)两种。这些产品中磷脂质的成分主要是磷酯酰胆碱、磷酯酰肌醇、磷酯酰乙醇胺、磷脂酸和固醇等。大豆卵磷脂在食品和家畜饲料中已进行了广泛的应用研究,并取得了良好的经济效益。研究表明,在水产     

大豆皮在奶牛饲料中的应用前景

大豆经压榨,萃取油脂成品后,再从油脚中提取卵磷脂,用豆粕生产脱脂蛋白粉。此外，还有一种加工副产物——大豆皮（SH）。它容重轻（170kg/m^3）。纤维含量高。价格低廉。用途不多。然而,根据它的营养成分和理化性能用作奶牛饲料倒是比较合适的。     

Signal Processing of Electroencephalogram and It''s Application

Electroencephalogram (EEG) signals are the electrical activities in the cortex or on the surface of scalp caused by the physiological activities of the brain which play a key role in the diagnosis of brain and the functional determination of brain. The authors discuss some methods for processing EEG signals from the view of the frequency domain and time domain, especially introduce some time-frequency analysis methods such as Wigner distribution, wavelet transform and matching pursuit etc. , ANN and non-linear analysis for EEG signals processing.     

HRT Effects on Biological Nutrient Removal in Spiral Up-flow Reactor System

Overall effects of HRT ( 11 h, 9 h, 8 h, 6 h ) on the Spiral up-flow reactor (SUFR) system are analyzed. The results of the operation under different HRT condition shows that the removal efficiencies of COD, TN and TP decreased not obviously with decreasing HRT when HRT is longer than 8h. Anaerobic retention time, anoxic retention time and aerobic retention time were 1.51 h,2.25 h and 4.24 h,respectively. The removal efficiencies of COD, TN and TP is kept over 93%,87% and 90.2%, respectively. Although the removal efficiencies changed obviously when the HRT was 6 h. Anaerobic retention time, anoxic retention time and aerobic retention time are 1.13 h,1.69 h and 3.18 h,respectively. COD-removal efficiency is always up to 85%, the removal efficiencies of TN and TP is kept over 76% and 72%,also has upper removal efficiencies. It is indicated that the SUFR system, which is similar to plug-flow-reactor, has strong stability and can compensate negative effects of increasing hydraulic loading.     

Improved Analytic Hierarchy Process Used in Optimal Selection of Waste Water Treatment Process

The improved Analytic Hierarchy Process is adopted for the optimal decision of waste water treatment process. The unified test of traditional method is avoided owing to using the three scale method and inducting the optimum transfer matrix and then converting into the unified judgement matrix. It is proven by example that it is feasible to use the improved Analytic Hierarchy Process in the optimal decision of the waste water treatment process.     

Effect of low-molecular-weight organic acids on Cl- adsorption by variable charge soils

Low-molecular-weight (LMW) organic acids exist widely in soils and have been implicated in many soil processes.The objective of the present paper was to evaluate effect of two LMW organic acids, citric acid and oxalic acid, on Cl^- adsorption by three variable charge soils, a latosol, a lateritic red soil and a red soil, using a batch method. The results showed that the presence of citric acid and oxalic acid led to a decrease in Cl- adsorption with larger decreases for citric acid. Among the different soils Cl- adsorption in the lateritic red soil and the red soil was more affected by both the LMW organic acids than that in the latosol.