The Effects of Zn, Mn, and Co Accumulation on Growth and Chemical Composition of Fucus vesiculosus L under Different Temperature and Salinity Conditions     

IVKA M. MUNDA  V. HUDNIK 《Marine Ecology》1988,9(3):213-225

Abstract. Combined effects of temperature, salinity, and metal enrichment (Zn, Mn, Co) on the growth rate and chemical composition of Fucus vesiculosus L. were studied in culture. Factorial combinations of two temperatures and three salinities were used. The results indicated that the accumulation of Zn and Mn into algal tissue was enhanced by dilution of the media, whereas Co accumulation exhibited maxima at the medium salinity. Zn accumulation was enhanced by temperature, while the opposite was true for Mn and Co.
In the presence of metals the usual dilution-induced changes in growth activity and chemical composition of Fucus plants were altered, while responses to the temperature factor remained unchanged. In diluted media, growth activity and mannitol content decreased along with a simultaneous increase of protein content. In the presence of Zn and Mn the mannitol content exhibited peaks at the medium salinity; in the presence of Co the dilution-induced pattern remained unchanged. Salinity-induced changes in growth and protein content were altered in the presence of metals. Maxima in growth rates were found at the medium salinity. Growth was higher in extremely diluted media than in scawater, indicating an inversion of responses to the salinity factor. Both the growth rate and mannitol content were lowest under the influence of Zn.  相似文献   

Heavy metals distribution in mangrove sediments along the mobile coastline of French Guiana   总被引：1，自引：0，他引：1  

C. Marchand  E. Lallier-Vergès  F. Baltzer  P. Albéric  D. Cossa  P. Baillif 《Marine Chemistry》2006

The accumulation of nine heavy metals in fine-grained sediments from the mangrove fringed coast of French Guiana is evaluated. The dynamic features of the South American tropical coastline, from the Amazon to the Orinoco Rivers, result in mangrove sediments being alternately submitted to phases of erosion and net sedimentation a few tens of years long. This process influences the distribution of the heavy metals associated with these frequently re-mobilized deposits. Sedimentary cores and mangrove plant samples were collected, at different seasons, in various swamps characterized by different properties (content of sedimentary organic matter, distance from sea water and fresh water). The ranges of measured concentrations expressed in μmol g^− 1 were the following: Cu (0.06 to 0.61), Co (0.12 to 0.68), Pb (0.08 to 0.18), Ni (0.32 to 0.76), Cr (0.61 to 1.40), Zn (1.25 to 5.94), Mn (4.36 to 45.4) and Fe (441 to 1128). No differences were found between sediments from mangroves developing upstream and downstream of urban areas, i.e. Cayenne and Kourou. This suggests that the content of mangrove sediments in heavy metals along the coastline of French Guiana is essentially the result of the continuous alternation of accumulation and transport phases occurring upstream after departing from the Amazon watershed. The sources of this heavy metals content are thus difficult to identify. However it is well known that the alluvium produced by the natural erosion of the Amazonian soils is naturally enriched in mercury. Also, the run-off from gold mining activities is known to contribute to mercury pollution. Ranges in total Hg were between 0.15 and 2.57 nmol g^− 1, with mean values close to 0.41 nmol g^− 1, and were clearly correlated with total organic carbon except for some outstanding high values, which may be a result of rapid geochemical changes. Heavy metal concentrations showed variations with depth. The redox conditions and the decay processes affecting the organic matter control the cycling of iron and manganese, which in turn control the concentrations and associations of heavy metals. These preliminary results suggest that the variations in heavy metal content with depth or between mangrove areas result largely from diagenetic processes rather than changes in metal input resulting from local human activities.  相似文献   

条斑紫菜锰超氧化物歧化酶原核表达及多克隆抗体制备   总被引：1，自引：0，他引：1  

邵林  茅云翔  阎斌伦  孔凡娜  王健 《中国海洋大学学报(自然科学版)》2010,40(4)

研究紫菜抗逆的分子机制,将本实验室克隆的条斑紫菜(Porphyra yezoensisUeda)锰超氧化物歧化酶(manganese superoxide dismutase,Mn SOD)基因全长cDNA克隆到质粒pET-30c(+)中,构建原核表达载体pET-S,转化大肠杆菌BL21(DE3)表达Mn SOD,表达产物的分子量约为30 KDa。利用不同浓度的Mn2+诱导重组Mn SOD的表达,可以检测到比活力随Mn2+浓度增高而上升的趋势。用重组Mn SOD免疫新西兰大白兔,制备了多克隆抗体,多克隆抗体的效价为1∶8 000。免疫印迹实验(Western Blot)表明该多克隆抗体具有很好的特异性。  相似文献   

On the processing and analysis of the data of the CORONAS-F/SPIRIT and other solar experiments     

S. A. Bogachev  V. V. Grechnev  S. V. Kuzin  V. A. Slemzin  O. I. Bugaenko  I. M. Chertok 《Solar System Research》2009,43(2):143-150

More than 300000 solar images in the extreme ultraviolet and soft X-ray regions were obtained using two telescopes and four spectroheliometers of the CORONAS-F/SPIRIT device from August 2001 to December 2005. Methods for the processing of such data and extracting physical information are presented, taking into account the experience of processing and analysis of other space experiments on solar research. Some results on applications of the considered methods are presented.  相似文献   

四川黑水地区锰矿床特征与找矿远景   总被引：1，自引：0，他引：1  

周兵  黄昌华  陈根 《四川地质学报》2010,30(1):16-19

黑水地区锰矿床主要赋存于下三叠统菠茨沟组地层中,受构造控制。矿石矿物主要有硬锰矿、软锰矿、褐锰矿、菱锰矿、钙菱锰矿等。脉石矿物主要有磁铁矿、针铁矿、黄铁矿等。主成矿元素锰的资源量可达特大型以上,属于沉积变质型锰矿床。该区及外围均具有很大的找矿潜力。  相似文献   

Application of geostatistics and GIS technique to characterize spatial variabilities of bioavailable micronutrients in paddy soils   总被引：6，自引：1，他引：5  

X.?M.?Liu  J.?M.?XuEmail author  M.?K.?Zhang  J.?H.?Huang  J.?C.?Shi  X.?F.?Yu 《Environmental Geology》2004,46(2):189-194

To understand the spatial dependency of bioavailable micronutrients in paddy soils, 134 soil samples were taken from Pinghu County, Zhejiang Province, south-east China to characterize the spatial variabilities of bioavailable Cu, Zn, Fe, and Mn. The geostatistics and geographic information system (GIS) techniques were applied. Bioavailable Zn and Mn were fitted to an exponential model with a range of 4.4 km and 2.97 km, respectively. Bioavailable Fe was fitted to the linear model with the longest range of 23.48 km. Bioavailable Cu did not show any spatial correlation with the fitted pure nugget effect model. Bioavailable Zn and Mn had strong spatial dependence due to the effects of intrinsic factors such as parent material, relief and soil types. Bioavailable Fe had moderate spatial dependence over a long distance. The spatial distribution of the four bioavailable micronutrients were significantly correlated to the soil formation factors. Human activity, such as application of fertilizer and pesticide, emission of waste gas and industrial pollution also had significant effects on the spatial distributions of the bioavailable micronutrients.  相似文献   

Rhythmic Layering in the Apatite (-Magnetite) Deposit in the Fanshan Complex, North China   总被引：1，自引：0，他引：1  

Chun Cheng    Shihua Sun  Qian Mao 《Resource Geology》2004,54(2):167-175

Abstract. The Fanshan complex consists of three (First- to Third-) Phases of intrusion. The First-Phase Intrusive is composed of rhythmic layers. The Fanshan apatite (-magnetite) deposit is situated near the top of no. 6 rhythmic Unit of the First-Phase Intrusive. Two sketch maps were drawn through the deposit along no. 25 cross-cut on 425 mL and no. 1 crosscut on 491 mL in the Fanshan mine. Through this mapping, a small-scaled rhythmic layering (called sub-rhythmic layering) was newly found. The sub-rhythmic layering consists of five typical rocks: biotite clinopyroxenite, biotite rock, biotite-apatite rock, alternation biotite-apatite rock and apatite rock. The thickness of layers varies from four millimeters to several meters. Six units of sub-rhythmic layering were distinguished. Each unit consists of biotite clinopyroxenite (or biotite rock and biotite-apatite rock) layer at the bottom and apatite rock layer at the top.
Major element compositions of biotite and clinopyroxene were analyzed. The trends of Mg/(Mg+Fe*+Mn) atomic ratio (Fe*: total iron) of biotite and clinopyroxene indicate that the magma evolved markedly from relatively magnesian bottom layer to less magnesian top layer in each sub-rhythmic unit. A general trend, however, through the whole sub-rhythmic layering sequence shows that the both minerals become relatively magnesian upwards. The hypotheses of liquid immiscibili-ty, gravitational settling and magma mixing are against with the results obtained in the present study. This study suggests that the apatite (-magnetite) deposit is formed through fractional crystallization process.  相似文献   

The Nigerian manganese-rich iron-formations and their host rocks—from sedimentation to metamorphism     

Arno Mücke 《Journal of African Earth Sciences》2005,41(5):407-436

This investigation deals with the Nigerian iron-formations and their host rocks and is based on about 560 mineral analyses (electron-microprobe) and 93 whole-rock analyses (64 iron-formations and 29 host rocks). The manganese-rich and Al-bearing iron-formations occurring in various schist belts of the northern and southern part of West-Nigeria consist of the magnetite-free silicate, the magnetite–silicate and the quartz-rich hematite facies.Iron-formations and host rocks originated from submarine-volcanogenic exhalations enriched in Fe, Mn and CO₂ and from Al₂O₃, SiO₂ and alkali (K₂O and Na₂O)-rich continental-derived pelitic to psammitic material. From these sources and their interaction and controlled by the volcanogenic activity, differently composed protoliths were deposited in the marine basin during the Birimian time. Subsequent metamorphism of greenschist to low amphibolite facies conditions during the Eburnian time led to the formation of the metaprotoliths of the magnetite–silicate (consisting of predominantly magnetite and quartz and subordinate of garnet and amphibole), the silicate facies (consisting of garnet, amphibole and rarely Mn-bearing ilmenite and quartz) and the metasediment phyllite. Garnets are predominantly almandine–spessartine solid solutions, whereas amphiboles are Mn and Ca-bearing grunerite–cummingtonite solid solutions. In the course of a second tectono-metamorphic event of Pan-African age, the magnetite–silicate facies iron-formation/phyllite association was transformed into the hematite facies and muscovite/biotite schists, whereas the silicate facies is characterized by extensive silicification features. The hematite facies and the silicified silicate facies are restricted to southern Nigeria where the second and heterogeneous tectono-metamorphic event is more pronounced (amphibolite facies conditions) than in northern Nigeria.The genesis, summarized as the metamorphic model, shows that the carbonate-rich (siderite, rhodochrosite and subordinate magnesite and calcite) protoliths were metamorphically transformed into the silicate and magnetite–silicate facies. The separation of Mn and Fe, leading to manganese-bearing iron-formations and iron-bearing manganese-formations was explained by varying pH-conditions, under which siderite (pH: 6.8–9.4) and rhodochrosite (pH: 9–11) precipitated.Similar to the Gunfit and Biwabik iron-formations of Minnesota, USA, the iron-formation of Bingi (Maru schist belt), now present in the form of the fayalite bearing silicate facies, was overprinted by contact metamorphism caused by a gabbro intrusion.  相似文献   

官地银金矿床氧化带划分的试验研究及物相锰在贫硫化物型银矿床中的应用     

张百胜 《矿产与地质》1998,(5)

官地银金矿床的原生矿石和氧化矿石在矿石颜色、矿物粒度、矿物组合和银金赋存状态均有明显差异。因此,氧化矿石在采矿和选矿上只能采取单采单选的方法。通过官地银金矿床银的物相、铅锌物相和铁锰物相的试验研究,来划分氧化带的范围和确定其埋深。官地银金矿床是应用物相锰来划分氧化带,即锰氧化率＝Ｍｎ４＋／ＴＭｎ×１００％,当锰氧化率≥２５％时划为氧化矿,＜２５％时划为原生矿,这一试验研究成果为官地银金矿床选择采选方案提供科学试验依据。  相似文献   

电镀镍锰胎体金刚石钻头的应用   总被引：6，自引：1，他引：5       下载免费PDF全文

李超群 《探矿工程》1998,(2):36-38

对电镀镍锰胎体金刚石钻头和镍钴胎体钻头的使用情况进行了对比。实践证明,镍锰胎体钻头特别适用于钻进坚硬破碎、强研磨性地层和软硬交替的地层。  相似文献