高体革鯻幼鱼肌肉营养成分分析     

马国红  刘羽清  师吉华  张延华  王爱英  卢红 《广东海洋大学学报》2009,29(1)

检测了高体革鯻(Scortum bacoo)幼鱼肌肉营养组成,结果表明:高体革鯻粗蛋白质量分数为17.77%,粗脂肪质量分数为3.42%,水解氨基酸总质量分数为15.71%,其中必需氨基酸质量分数为7.50%,占氨基酸总量的47.74%,鲜味氨基酸总质量分数为5.46%,占氨基酸总量的34.75%,必需氨基酸指数为88.60。说明高体革鯻具有较高的营养价值和养殖价值。  相似文献   

Si–C interactions during degradation of the diatom Skeletonema marinoi     

Brivaëla Moriceau  Madeleine Goutx  Catherine Guigue  Cindy Lee  Robert Armstrong  Marie Duflos  Christian Tamburini  Bruno Charrire  Olivier Ragueneau 《Deep Sea Research Part II: Topical Studies in Oceanography》2009,56(18):1381-1395

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大獭蛤软体部营养成分的分析与评价   总被引：1，自引：0，他引：1  

潘英  秦小明  潘红平 《广东海洋大学学报》2007,27(3):78-81

对大獭蛤(Lutraria maxima)软体部进行营养成分分析,并对其营养价值进行综合评定。结果表明,大獭蛤软体部粗蛋白含量为81.20%,干物质中水解氨基酸总量为83.50%,其中必需氨基酸为30.22%,占氨基酸总量的36.19%;氨基酸中6种呈味氨基酸含量丰富,占氨基酸总量的53.81%;大獭蛤软体部第一限制氨基酸为亮氨酸;矿物质含量丰富。可见,大獭蛤软体部营养价值高,呈味特性良好。  相似文献   

基于卫星遥感数据改进区域尺度的显热通量模型     

宋小宁  赵英时  冯晓明 《地理与地理信息科学》2007,23(1):36-38

以西北半干旱地区的内蒙古农牧交错地带锡林郭勒盟为研究区,以不同退化程度的草地为研究对象,通过叶面积指数计算各像元的动力传输粗糙度长度,以改进显热通量算法;并结合植被／土壤组分温度分别计算基于亚像元的植被／土壤的显热通量。由敏感性分析和模型验证表明,改进的显热通量算法能够提高区域尺度的能量平衡计算精度。  相似文献   

The molecular composition of ambers     

J.O. Grimalt  B.R.T. Simoneit  P.G. Hatcher  A. Nissenbaum 《Organic Geochemistry》1988,13(4-6)

Bulk (elemental composition, IR, CP/MAS ¹³C NMR) and molecular (GC-MS) analyses have been performed on a series of ambers and resins derived from different locations (Dominican Republic, Philippines, Canada, Israel, New Zealand, Chile) having diverse botanical affinities (Araucariaceae, Hymenaea) and variable age (from Holocene to Early Cretaceous). No major differences have been observed from the elemental composition and the spectroscopic data; however, the molecular analyses of the solvent extractable fraction show that a specific mixture of components is present in each sample. These are mainly diterpenoid products that in general are also found abundantly in the higher plants from which the ambers and resins originate. Nevertheless, a direct relationship between major terpenoid constituents in fossil resins and precursor plant materials can only be established for the younger samples.Irrespective of the geographical or botanical origin of the ambers and resins, several common age-dependent molecular transformation trends can be recognized: (1) progressive loss of olefinic bonds (especially those located in exocyclic positions), (2) decrease of functionalized products, and (3) increasing proportion of aromatized components. However, even in the samples of older age (Cretaceous) the degree of aromatization is very low when compared with that of other higher-plant related materials such as fossilized woods or low rank coals. This indicates that maturation must involve essentially olefin polymerization processes instead of extensive aromatization.  相似文献   

作物叶面蒸腾与棵间蒸发分摊系数的计算方法   总被引：13，自引：2，他引：13       下载免费PDF全文

康绍忠  张富仓 《水科学进展》1995,6(4):285-289

依据在冬小麦和玉米冠层表面及冠层内部下方土壤表面的净辐射观测资料,建立了一个能较准确地反映叶面蒸腾与棵间土壤蒸发分摊系数物理变化规律的较实用的计算模式,结果表明,分摊系数(α)随叶面积指数(LAI)增加而增加,且具有明显的日变化,α在中午最小、早、晚稍大,这种日变化受叶气孔调节的影响。  相似文献   

Amino acid nitrogen in atmospheric aerosols: Occurrence,sources and photochemical modification   总被引：2，自引：0，他引：2  

Peter J. Milne  Rod G. Zika 《Journal of Atmospheric Chemistry》1993,16(4):361-398

The presence of amino acids in atmospheric precipitation and aerosols has been noted for many years, yet relatively little is known about these or other nitrogen containing organic compounds in the atmosphere. Marine and continental rainwater analyses indicate that atmospheric aerosols, and subsequently atmospheric precipitation, may contain substantial levels of free and combined amino acids. The most likely source of amino N in the remote marine atmosphere appears to be the injection of proteinaceous material through the action of bursting bubbles at the sea-air interface or the long range transport from terrestrial sources. The capacity of these substrates to undergo photooxidation and photodegradation in the atmosphere to simpler species, such as ammonium ions, carboxylic acids, and for the S containing amino acids, oxidized forms of sulfur, has received little attention from atmospheric chemists. The photochemistry of covalently bound amino groups, particularly as found in peptides and amino acids, is discussed here with the purpose of summarizing what is known of their occurrence and their possible importance to atmospheric chemistry.  相似文献   

Characterization of two newArtemia populations from two solar saltworks of Lesbos Island (Greece): biometry,hatching characteristics and fatty acid profile   总被引：1，自引：0，他引：1  

G. V. Triantaphyllidis  T. J. Abatzopoulos  R. M. Sandaltzopoulos  G. Stamou  C. D. Kastritsis 《International Journal of Salt Lake Research》1993,2(1):59-68

Cysts of two parthenogeneticArtemia strains from the Kalloni and Polychnitos saltworks on Lesbos Island were evaluated for their potential use in aquaculture. The characterizations performed were: cyst and naupliar biometrics, cyst hatching characteristics, and fatty acid profile of instar-I nauplii. Deactivation of diapause after treatment with H₂O₂ and/or decapsulation were applied in order to improve cyst hatchability. The evaluation revealed that the strains studied exhibit acceptable hatching characteristics for parthenogeneticArtemia and that the fatty acid profile of the Kalloni strain is excellent for use in culturing marine fishes and crustaceans. Statistical analyses on cyst and naupliar biometrics showed that the two populations characterized are almost identical and very similar to other Greek parthenogenetic strains.  相似文献   

云南金顶铅锌矿床碎屑岩地层中铅锌活化迁移的实验研究   总被引：2，自引：0，他引：2  

姚志健  唐宏 《地球科学》1991,16(2):181-188

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Carboxylic monoacids in the air of mayombe forest (Congo): Role of the forest as a source or sink     

Jean Servant  Georges Kouadio  Bernard Cros  Robert Delmas 《Journal of Atmospheric Chemistry》1991,12(4):367-380

In the tropical rain forests of the Congo during the dry season, from June to September 1987, carboxylic acid partial pressures (P _gas) in the air above the canopy, at ground level, and at the boundary layer, were estimated from water samples such as fog and rainwater. The concentrations of these acids were also measured in the sap of tree leaves. Tree leaves act as a sink or as a source if the acid P _gas is greater of lower than the acid concentrations in molecular form in sap. For each of these soluble gases, there is a value of P _gas where the exchange is nul. This is called the compensation point. Values of the compensation point for some tree leaves were evaluated according to Henry's law. Henry's law coefficients at ppm levels were redetermined for formic (HCOOH), acetic (CH₃COOH), propionic (CH₃CH₂COOH), and isobutyric (CH₃CH(CH₃)COOH) acids.By comparison of P _gas and compensation points, it is concluded that the forest was a potential source for these acids. The soil-or the litter-acts as a significant source of a carboxylic acid of C₃ or C₄ atoms in the aliphatic chain. This carboxylic acid, not yet fully characterized, could play an important role in the rain acidity in forested zones of the equatorial areas.The direct emission of these carboxylic acids by vegetation was the main source in the boundary layer above the forest. The average emissions were 3.1×10⁹, 7.8×10⁹, and 8.4×10⁹ molecules cm^-2 s^-1 for HCOOH, CH₃COOH, and CH₃CH₂COOH, respectively. The savanna is an exogenous source of HCOOH and CH₃CH₂COOH during moderately rainy days for 30% of the time. The ozonolysis of isoprene seems to be a small source of HCOOH.  相似文献