冬季和春季长江口及其近海水域浮游病毒丰度的分析   总被引：9，自引：2，他引：7  

白晓歌  汪岷  马晶晶  孙军  梁彦韬  乔倩 《海洋与湖沼》2007,38(4):367-372

采用荧光显微技术,对2006年长江口及近海水域20个站点的表层及10m层或潜水体冬、春两季的浮游病毒丰度进行了检测,对浮游病毒丰度在季节（冬、春两季）、水平分布和垂直分布上的变化进行了探讨.调查区浮游病毒丰度在冬、春季节上并无明显差异,但在水平分布上存在很大差异,河口区浮游病毒直接检测量（Virus Direct Count, VDC）达到10^7个/ml,近海水域VDC为10^6个/ml,河口区的浮游病毒丰度都明显高于近海水域病毒丰度 （P＜0.01）.在垂直分布上,冬、春两季长江口水域水深小于10m的站位,表层浮游病毒丰度与底层病毒丰度无明显差别,水深大于10m的站位,表层水样的浮游病毒丰度都高于10m水层病毒丰度,说明长江口浮游病毒的垂直分布与站位总水深有关.还通过比较各站点VDC与叶绿素a含量的数据,分析了二者之间的相关性：冬季浮游病毒丰度与叶绿素a含量成正相关性;春季浮游病毒丰度与叶绿素a含量成负相关性,但病毒丰度受叶绿素a含量的影响仅为10%-11%.  相似文献   

钽钼杂多酸—碱性染料多元缔合物体系的研究   总被引：1，自引：0，他引：1  

李祖碧  王加林 《岩矿测试》1993,12(1):38-42

在PVA、OP或Tween-60存在下,采用平衡移动法确定了碱性染料亚甲基蓝、耐尔蓝(NB)、罗丹明B(RB)、丁基罗丹明B(BRB)、结晶紫(CV)、乙基紫(EV)与Ta的摩尔比是1:1至7:1;考察了NB(或BRB)-钽钼杂多酸缔合物的红外光谱,初步探讨了反应机理:比较了几个碱性染料-钽钼杂多酸缔合物体系的光度特性,筛选出两个摩尔吸光系数>2×10~6的分析体系,并用于合金钢和地质标样中痕量Ta的测定,方法可行。  相似文献   

Prediction method of sand-movement direction in water by geochemical elements     

K. Mizumura  T. Nishimoto  H. Tsutsui  T. Yamamoto 《Environmental Geology》1995,25(2):100-108

The analysis of sand samples by x-ray fluorescent spectroscopy (XRF) gives the ratio of the geochemical elements to construct the sand samples. The x-ray analysis therefore shows the geochemical characteristics of sand in the sampled area. In this study, sand is sampled on coasts and rivers of the Noto Peninsula to determine the geochemical elements and to show the geological characteristics that occur, especially iron and calcium. The experiments show the effect of rivers and Kotogahama beach on iron and calcium, respectively. Applying the method of ratio matching to the measured data of the geochemical elements, the direction of movement of sand on the coast is determined by considering the correlation matrix and the ratio of geochemical elements between sand samples at two locations. The predominant longshore direction movement of sand offshore in the study area is from south to north. Sand in rivers is not directly transported to adjacent beaches; however, offshore sand is transported to beaches. The estimated direction of movement of sand longshore near coastal structures agrees with observations. The proposed method to predict the direction of movement of sand gives the correct one in comparison with the observed data in rivers.  相似文献   

Soil water residence times and solute uptake on a dolomite bedrock—preliminary results     

Stephen T. Trudgill  Ian M. S. Laidlaw  Peter L. Smart 《地球表面变化过程与地形》1980,5(1):91-100

Calcium and magnesium levels have been monitored in slope foot drainage waters on a dolomite bedrock. Both calcium and magnesium rich pulses occur. Short term dissolution experiments demonstrate high calcium levels in solution while other authors have suggested that long residence time groundwater has relatively high levels of magnesium due to calcite precipitation. Patterns of field fluctuations in Ca: Mg ratios can thus be tentatively interpreted in terms of short residence time water of high calcium content mixing with long residence time water of high magnesium content. Fluorometric dye tracing has been used to indicate the orders of magnitude of soil water residence times, suggesting that quickflow components are resident in the system for a few hours to a few days. Further work is in progress.  相似文献   

Tracing dissolved organic matter cycling in the eastern boundary of the temperate North Atlantic using absorption and fluorescence spectroscopy     

《Deep Sea Research Part I: Oceanographic Research Papers》2014

Apparent oxygen utilization (AOU), dissolved organic carbon (DOC), coloured dissolved organic matter (CDOM) absorption spectra, and CDOM fluorescence characteristic of aromatic amino acids (excitation/emission 280 nm/320 nm; F(280/320)) and marine-humic like substances (320 nm/410 nm; F(320/410)) were measured in full depth during a cruise in the temperate Eastern North Atlantic (ENA). An optimum multi-parameter (OMP) inverse method was run to calculate water mass proportion-weighted average (archetypal) concentrations of these chemical parameters for all water masses and samples. Archetypal concentrations retain the variability due to water mass mixing and basin scale mineralization from the water mass formation sites to the study area. Conversely, the difference between measured and archetypal concentrations, retain the variability due to dissimilarities in mineralization processes within the study area. Our analysis indicates that DOC supported 26±3% of the AOU in the dark temperate ENA and that basin scale processes occurring at and from the formation area of the water masses explained 63% of the total DOC variability. Our data also suggests that DOC remineralized at the basin scale was of lower molecular weight, and with a lower proportion of fluorescent aromatic amino acids than found within the study area. The relationship between the absorption coefficient at 254 nm (a_CDOM(254)) and AOU indicates that a_CDOM(254) was consumed during organic matter remineralization in the dark ocean, with 55% of the variability being explained by basin scale processes. The relationships of F(320/410) with AOU and DOC confirmed that marine humic-like substances are produced by microbial degradation processes, at a rate of 6.1±0.9×10⁻³ mg equivalents of QS mol AOU⁻¹. Our results also indicate that basin-scale remineralization processes account for 85% of the total variability of F(320/410), emphasizing that large scale processes control the formation of humic-like substance in the dark ENA.  相似文献   

Multidye Biosorption: Wavelet Neural Network Modeling and Taguchi L16 Orthogonal Array Design     

《洁净——土壤、空气、水》2017,45(5)

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Photocatalytic Activity of Combustion Synthesized Nanocrystalline CeAlO3     

Parag A. Deshpande  S. T. Aruna  Giridhar Madras 《洁净——土壤、空气、水》2011,39(3):259-264

The photocatalytic activity of combustion synthesized nanocrystalline CeAlO₃ was determined for the degradation of four anionic and four cationic dyes. The perovskite oxide showed high‐photocatalytic activity and a complete degradation of all the dyes was possible within 2 h. The photocatalytic activity of the compound was comparable with the activity of the commercial Degussa P‐25 TiO₂ catalyst. The degradation of dyes was found to follow first order kinetics and the first order degradation rate constants were determined.  相似文献   

溶藻弧菌的间接荧光抗体快速检测   总被引：18，自引：0，他引：18  

王军  鄢庆枇  苏永全  张纹 《海洋科学》2002,26(7):1-4

建立了大黄鱼病原溶藻弧菌的间接荧光抗体检测方法，溶藻弧菌的特异性抗血清由新西兰兔制备，试管凝集法测定抗血清及交叉反应效价，吸附离心法去除交叉反应，荧光抗体为异硫氰酸荧光素标记的羊抗兔免疫球蛋白，现场检测对具典型弧菌病表症大黄鱼病原检出率为100％，表观健康大黄鱼病原检出率为30％，养殖海水检测结果均为阴性，结果表明，间接荧光抗体检测法不仅可以用于已感染发病大黄鱼的快速检测，而且还能用于已感染未发病大黄鱼的检测。  相似文献   

海洋光合细菌对五种活性染料的脱色研究     

赵亮  李兰生  刘金雷 《海洋湖沼通报》2006,(3):73-78

实验研究了不同条件下海洋光合细菌的混合菌种对五种活性染料的脱色效果。结果表明,海洋光合细菌耐盐性较好,对五种染料都有很好的脱色效果。温度对各类染料影响不同,但五种染料都在30~35℃时达到最佳脱色效果。菌种适应的PH值范围广,驯化后活性增强。在100mg/L的浓度下,染料X-3B对细菌生长没有明显的抑制作用。  相似文献   

Biodegradation of Malachite Green by the Ligninolytic Fungus Aspergillus flavus     

《洁净——土壤、空气、水》2017,45(4)

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