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1.
Fifty-four rare elements were tested for their effects on the nicotine level of tobacco (Nicotiana tabacum L.) plants grown in solution culture. Be, Cu, Pd, Pt, and Sm definitely increased nicotine yield (over 25%), whereas Bi, Co, Ho, Pb, Ni, Rb, Ag, Tl, Sn, U. V. and Zr definitely decreased nicotine yield. Cs, Er, Li, Rh, Ru, Se, Sr, Ti, and Yb possibly increased (less than 25%) nicotine yield, whereas As, Ce, Cr, Dy, Gd, I, Mo, Nd, Re, Ta, and Th possibly decreased nicotine yield. Other elements including Al, Ge, Au, Hf, In, Ir, La, Lu, Hg, Os, Pr, Sc, Te, Tb, Tm, W, and Zn showed no significant effects. 相似文献
2.
We report the parameterization of AM1* for the elements palladium and silver. The basis sets for both metals contain one set
each of s-, p- and d-orbitals. AM1* parameters are now available for H, C, N, O and F (which use the original AM1 parameters), Al, Si, P, S, Cl,
Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Br, Zr, Mo, Pd, Ag, I and Au. The performance and typical errors of AM1* are discussed
for Pd and Ag and compared with the PM6 Hamiltonian. 相似文献
3.
Dienys G Sereikaite J Luksa V Jarutiene O Mistiniene E Bumelis VA 《Bioconjugate chemistry》2000,11(5):646-651
Zn(2+) and Co(2+) ions are known to promote human growth hormone reversible dimerization. In these studies, dimerization was also shown to be initiated by nine other metal ions: Cd(2+), Hg(2+), Cu(2+), Ag+, Au(3+), Au+, Pd(2+), Ni(2+), and Pt(4+). In some cases (Hg(2+), Ag(+), Au(3+), and Ni(2+)) formation of higher oligomers also took place. In addition further detailed investigation of dimerization in the presence of Zn(2+) ions was carried out. 相似文献
4.
Richard F. Puchyr Dean A. Bass Rob Gajewski Mishelle Calvin William Marquardt Karen Urek Mary Ellen Druyan David Quig 《Biological trace element research》1998,62(3):167-182
The preparation of hair for the determination of elements is a critical component of the analysis procedure. Open-beaker,
closedvessel microwave, and flowthrough microwave digestion are methods that have been used for sample preparation and are
discussed. A new digestion method for use with inductively coupled plasma-mass spectrometry (ICP-MS) has been developed. The
method uses 0.2 g of hair and 3 mL of concentrated nitric acid in an atmospheric pressurelow-temperature microwave digestion
(APLTMD) system. This preparation method is useful in handling a large numbers of samples per day and may be adapted to hair
sample weights ranging from 0.08 to 0.3 g. After digestion, samples are analyzed by ICP-MS to determine the concentration
of Li, Be, B, Na, Mg, Al, P, S, K, Ca, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Ge, As, Se, Rb, Sr, Zr, Mo, Pd, Ag, Cd, Sn, Sb,
I, Cs, Ba, Pt, Au, Hg, Tl, Pb, Bi, Th, and U. Benefits of the APLTMD include reduced contamination and sample handling, and
increased precision, reliability, and sample throughput. 相似文献
5.
Jutta Begerow 《Biomarkers》1999,4(1):27-36
The aim of this study was to investigate to which extent noble-metal dental alloys contribute to the total platinum (Pt), palladium (Pd), and gold (Au) body burden of the general population. The urinary Pt, Pd, and Au excretion was determined in three non-occupationally exposed volunteers before and up to 3 months after insertion of a highgold dentalalloy. The in-vitro release of Pt, Pd, and Au from four different types of dental alloys into either artificial saliva or 1% lactic acid solution was additionally investigated. The Pt, Pd, and Au concentrations were determined by sector field inductively coupled plasma mass spectrometry (SF-ICP-MS). Before insertion of the high-gold dental alloy, the Pt excretion of the patients ranged between 1.0 and 7.4 ng l-1 (0.6-3.3 ng g-1 creatinine). In the immediate post-insertion phase the Pt excretion rose to 10.5-59.6 ng l-1 (14.5-33.2 ng g-1 creatinine). This is a mean increase by a factor of 12 compared with the average Pt excretion before insertion. Three months after insertion, the Pt excretion was still elevated by a factor of 7. Contrary to Pt, the Au and Pd excretion in urine was not significantly increased after insertion of this type of high-gold dental alloy. Our in-vitro investigations confirm the assumption that Pt, Pd, and Au are released from noble metal containing dental alloys by corrosion. Under the applied conditions, the release was in the lower ng cm-2 range. It can be concluded that the Pt release from dental alloys can predominantly contribute to the Pt exposure of non-occupationally exposed persons. It can exceed the exposure from all other environmental sources including the Pt release from automobile exhaust catalysts. 相似文献
6.
Krachler M Prohaska T Koellensperger G Rossipal E Stingeder G 《Biological trace element research》2000,76(2):97-112
Magnetic sector field inductively coupled plasma-mass spectrometry (ICP-MS) was applied to the reliable determination of the
8 essential trace elements cobalt (Co), chromium (Cr), copper (Cu), iron (Fe), manganese (Mn), nickel (Ni), selenium (Se),
and vanadium (V) as well as the 7 nonessential and toxic elements silver (Ag), aluminum (Al), arsenic (As), gold (Au), platinum
(Pt), scandium (Sc), and titanum (Ti) in 27 transitory and mature human milk samples and in 4 selected infant formulas. This
advanced instrumentation can separate spectral overlaps from the analyte signal hampering significantly the determination
of many trace elements by conventional ICP-MS. Moreover, superior detection limits in the picogram per liter range can be
obtained with such magnetic sector field instruments. Therefore, this is the first study to report the concentrations of the
elements Ag, Au, Pt, Sc, Ti, and V in human milk and in infant formulas. Concentrations of Ag (median: 0.41 μg/L; range: <0.13–42
μg/L) and Au (median: 0.29 μg/L; range 0.10–2.06 μg/L) showed large variations in human milk that might be associated with
dental fillings and jewelry. Pt concentrations were very low with most of the samples below the method detection limit of
0.01 μg/L. Human milk concentrations of Co (median: 0.19 μg/L), Fe (380 μg/L), Mn (6.3 μg/L), Ni (0.79 μg/L), and Se (17 μg/L)
were at the low end of the corresponding reference ranges. Concentrations of Cr (24.3 μg/L) in human milk were five times
higher than the high end of the reference range. For Al (67 μg/L), As (6.7 μg/L), and V (0.18 μg/L), most of the samples had
concentrations well within the reference ranges. All elemental concentrations in infant formulas (except for Cr) were approximately
one order of magnitude higher than in human milk. 相似文献
7.
Ions released from metallic dental materials used in orthodontic appliances could induce undesirable effects on cells and
tissues. This study evaluates the biocompatibility of two of the most labile components of metallic dental alloys on osteoblastlike
cells. The influence of protein and ions on metal dissolution properties is also investigated using different electrolyte
solutions. Morphological alterations, cell growth, and differentiation of osteoblasts were assessed after exposure to pure
metals (Ag, Cu, Pd, Au) and Ni−Ti alloy and correlated with the kinetics of elements released into the culture media. Results
showed that Cu and Ag were the most cytotoxic elements and the other metals were biocompatible with the osteoblasts. The parameters
of biocompatibility were correlated with the levels of ions detected into the culture media. Metal ions induced cell death
through early mitosis arrest, apoptotic phenomena, and necrotic processes. Voltammograms showed that anions and proteins interfered
in the corrosion process. Fetal bovine serum (FBS) strongly affected the electrochemical process, decreasing the oxidation
rate of the metals. In conclusion, copper and silver ions showed a time-dependent low biocompatibility, which correlated with
the concentration of released ions. The dissolution of the metallic materials was dependent on the composition of the simulated
biological media. 相似文献
8.
Umrania VV 《Bioresource technology》2006,97(10):1237-1242
Investigations were carried out to isolate microbial strains from soil, mud and water samples from metallurgically polluted environment for bioremediation of toxic heavy metals. As a result of primary and secondary screening various 72 acidothermophilic autotrophic microbes were isolated and adapted for metal tolerance and biosorption potentiality. The multi-metal tolerance was developed with higher gradient of concentrations of Ag, As, Bi, Cd, Cr, Co, Cu, Hg, Li, Mo, Pb, Sn and Zn. The isolates were checked for their biosolubilization ability with copper containing metal sulfide ores. In case of chalcopyrite 85.82% and in covellite as high as 97.5% copper solubilization occurred in presence of 10(-3) M multi-heavy metals on fifth day at 55 degrees C and pH 2.5. Chemical analyses were carried out by inductively coupled plasma spectroscopy (ICP) for metal absorption. The selected highly potential isolate (ATh-14) showed maximum adsorption of Ag 73%, followed by Pb 35%, Zn 34%, As 19%, Ni 15% and Cr 9% in chalcopyrite. 相似文献
9.
Our work aimed at extending the search for the trace elements (TE) abnormalities in patients with lung cancer and in healthy controls who smoke, and also for evidence of a possible association between lung cancer and TE. The analysis of the hair from patients with Stage-IIIB non-small cell lung cancer (group 1) and healthy controls (group 2) were analyzed using the inductively coupled plasma mass spectrometry technique in order to obtain information on the correlation between the lung cancer patients and healthy controls. Sixty-seven one-hair samples in group 1 were individually collected before chemoradiotherapy. For comparison, 74 hair samples were collected from group 2. In group 1, the trace elements present at the highest levels were measured to be Ca, Zn, Sn, Na and Mg, respectively, and they were quantified as 68.2, 53.2, 33.9, 23.3, and 28.9?μg.kg(-1), respectively. In group 2, the trace elements present at the highest levels were Zn, Mg, Ca, Fe, and Se, respectively, and they were quantified as 109.7, 31.9, 30.8, 25.0, and 20.1?μg.kg(-1). In group 1, the highest levels of Ca, Sn, and Na were 2.03, 1.06, and 1.01 times higher, respectively, compared with group 2. In group 2, Zn, Mg, Fe, and Se were 2, 1.01, 2.7, and 1.6 times higher, respectively, compared with group 1. When the levels of trace elements were compared between groups 1 and 2 using Student's t test, the levels of Ag, Au, Be, Bi, Ca, Cd, Ce, Co, Cr, Cu, Fe, Ga, Hg, K, Ni, Rb, Rh, Sb, Sc, Ti, V, and Zn were found to be statistically different (p?0.05). According to Pearson's correlation, the most powerful correlation was found for Cr-As (r?=?0.858) couple in group 1 (r?=?0.745) and for Mn-Cr couple in group 2. The factors obtained according to converted matrix were observed to be as follows: for group 1, first factor, ten variables (Cd, Li, Cs, Ag, Rb, Pd, Ga, Zn, Al, and K); second factor, seven variables (Cr, As, Sn, Co, Ca, Rh, and Fe) and third factor, four variables (Mn, Au, Cu, and Hg). Within the first factor that best describes the overall change, the most important variables are Cd and Li, respectively the first and the second factors. Group 2 contained the following: first factors, six variables, Cr, Mn, Al, Ba, Rb, and Pb; second factor, eight variables, Co, As, Sn, Cd, Hg, Cs, Ca, and Ce; third factor, five variables Na, Ga, Be, B, and Sr; and fourth factor, two variables K and Ag. First, second, third, and fourth factors explain the 36% of the overall change. Within the first factor that best described the overall change, the most important variables were Cr and Mn. In this analysis, we observed that the group 2 trace elements accumulated were heavy metals and that the control group showed both heavy metals and macroelements required for the body. The average trace elements levels in the two groups were evaluated. In addition, the general role of trace elements in the lung carcinogenic processes was discussed. The study revealed that the carcinogenic processes are significantly affecting the trace elements and the trace elements distribution in the hair of lung cancer patients compared with the healthy controls. It was revealed that there was a relation between lung cancer and trace elements, especially heavy metals. Our findings suggest that the heavy metals accumulated in the body may pose a high risk for lung cancer development. 相似文献
10.
11.
Ying Xiong Chaitanya Raj Adhikari Hidetaka Kawakita Keisuke Ohto Katsutoshi Inoue Hiroyuki Harada 《Bioresource technology》2009,100(18):4083-4089
Persimmon waste was chemically modified with dimethylamine (DMA) to obtain a tertiary-amine-type gel, named DMA persimmon waste gel (DMA-PW). It was found to be effective for the adsorption of Au(III), Pd(II), and Pt(IV) in hydrochloric acid medium. In contrast, base metals such as Cu(II), Zn(II), Fe(III), and Ni(II) were not practically adsorbed. The formation of ion pairs of the metal chloro complex anions with the protonated adsorption gels was proposed as the main adsorption process. The gel exhibited selectivity only for precious metals with a remarkably high capacity for Au(III), i.e., 5.63 mol/kg dry gel and comparable capacities, i.e., 0.42 and 0.28 mol/kg for Pd(II) and Pt(IV), respectively. According to the kinetic and electrochemical studies, the adsorption rate of Au(III) was greatly enhanced by the chemical modification. Also, its excellent adsorption characteristics for the precious metals were confirmed by adsorption and elution tests using a column packed with the DMA-PW gel. 相似文献
12.
Sofia Zaichick Vladimir Zaichick Sergey Nosenko Irina Moskvina 《Biological trace element research》2012,149(2):171-183
Contents of 52 trace elements in intact prostate of 64 apparently healthy 13?C60-year-old men (mean age 36.5?years) were investigated by inductively coupled plasma mass spectrometry. Mean values (M ± S????) for mass fraction (in milligrams per kilogram, on dry-weight basis) of trace elements were as follows: Ag 0.041?±?0.005, Al 36?±?4, Au 0.0039?±?0.0007, B 0.97?±?0.13, Be 0.00099?±?0.00006, Bi 0.021?±?0.008, Br 29?±?3, Cd 0.78?±?0.09, Ce 0.028?±?0.004, Co 0.035?±?0.003, Cs 0.034?±?0.003, Dy 0.0031?±?0.0005, Er 0.0018?±?0.0004, Gd 0.0030?±?0.0005, Hg 0.046?±?0.006, Ho 0.00056?±?0.00008, La 0.074?±?0.015, Li 0.040?±?0.004, Mn 1.53?±?0.09, Mo 0.30?±?0.03, Nb 0.0051?±?0.0009, Nd 0.013?±?0.002, Ni 4.3?±?0.7, Pb 1.8?±?0.4, Pr 0.0033?±?0.0004, Rb 15.9?±?0.6, Sb 0.040?±?0.005, Se 0.73?±?0.03, Sm 0.0027?±?0.0004, Sn 0.25?±?0.05, Tb 0.00043?±?0.00009, Th 0.0024?±?0.0005, Tl 0.0014?±?0.0001, Tm 0.00030?±?0.00006, U 0.0049?±?0.0014, Y 0.019?±?0.003, Yb 0.0015?±?0.0002, Zn 782?±?97, and Zr 0.044?±?0.009, respectively. The upper limit of mean contents of As, Cr, Eu, Ga, Hf, Ir, Lu, Pd, Pt, Re, Ta, and Ti were the following: As ??0.018, Cr ??0.64, Eu ??0.0006, Ga ??0.08, Hf ??0.02, Ir ??0.0004, Lu ??0.00028, Pd ??0.007, Pt ??0.0009, Re ??0.0015, Ta ??0.005, and Ti ??2.6. In all prostate samples, the content of Te was under detection limit (<0.003). Additionally, ratios of the Zn content to other trace element contents as well as correlations between Zn and trace elements were calculated. Our data indicate that the human prostate accumulates such trace elements as Al, Au, B, Br, Cd, Cr, Ga, Li, Mn, Ni, Pb, U, and Zn. No special relationship between Zn and other trace elements was found. 相似文献
13.
This article discusses the mineralogy and geochemical characteristics of the fresh copper-flotation waste samples. The mobility of As, Cd, Cr, Cu, Ni, Pb, Tl, Zn was investigated by leaching tests. The main mineral phases identified concerned dolomite, quartz, clay minerals, feldspars, and copper-bearing minerals. Chemically, CaO and silica were dominating, along with a significant concentration of precious (Cu), refractory (Cr, Ti, V, Zr), and toxic (As, Cd, Pb) metals. Elements were bound mainly to the residual fraction and sulphides in the following order: Pb > Cu ≈ Tl > As ≈ Zn > Ni ≈ Cr > Cd. The metal mobility patterns expressed as a percentage of total concentrations, were as follows: Cd (42%) > Cr (26%)> Ni (24%) > Zn (23%) > As (22%) > Tl (20%) > Cu (18%) > Pb (2%). Those constituents were released earlier in lower pH values, although Cu, Cr, and Pb were also released in higher alkaline pH values. However, Zn release was not dependent on pH. When L/S values decreased, elements like As, Cr, Cu, Pb, and Tl were released. That process caused decrease of Cd, Ni, and Zn release. 相似文献
14.
Peter Heitland Helmut D. Kster 《Journal of trace elements in medicine and biology》2006,20(4):253-262
The trace elements Ag, As, Au, B, Ba, Be, Bi, Cd, Ce, Co, Cs, Cu, Ga, Hf, Hg, In, La, Mn, Mo, Ni, Pb, Pd, Rb, Rh, Ru, Sb, Se, Sn, Sr, Te, Th, Tl, U, V, W, Y and Zr were determined in 130 human blood samples from occupationally non-exposed volunteers living in the greater area of Bremen in northern Germany. The blood samples were collected in lithium heparin monovettes developed for trace metal determination and were analysed by inductively coupled plasma mass spectrometry (ICP–MS) with an octopole-based collision/reaction cell. For sample introduction into the ICP, the blood samples were diluted 1/10 (V/V) with a 0.1% Triton-X-100 and 0.5% (V/V) ammonia solution. The method validation of our developed routine method is described for all 37 elements and results about internal and external quality assurance are discussed. Information on exposure conditions of all human subjects were collected by questionnaire-based interviews, including smoking habits, seafood consumption and the type of dental alloys in the teeth. Mean values, geometric mean values, ranges and selected percentiles of all elemental concentrations in human blood are presented, which helps toxicologists and clinical chemists planning research about exposition to metals and health effects caused by exposition to metals. 相似文献
15.
Choi DW Do YS Zea CJ McEllistrem MT Lee SW Semrau JD Pohl NL Kisting CJ Scardino LL Hartsel SC Boyd ES Geesey GG Riedel TP Shafe PH Kranski KA Tritsch JR Antholine WE DiSpirito AA 《Journal of inorganic biochemistry》2006,100(12):2150-2161
Methanobactin (mb) is a novel chromopeptide that appears to function as the extracellular component of a copper acquisition system in methanotrophic bacteria. To examine this potential physiological role, and to distinguish it from iron binding siderophores, the spectral (UV–visible absorption, circular dichroism, fluorescence, and X-ray photoelectron) and thermodynamic properties of metal binding by mb were examined. In the absence of Cu(II) or Cu(I), mb will bind Ag(I), Au(III), Co(II), Cd(II), Fe(III), Hg(II), Mn(II), Ni(II), Pb(II), U(VI), or Zn(II), but not Ba(II), Ca(II), La(II), Mg(II), and Sr(II). The results suggest metals such as Ag(I), Au(III), Hg(II), Pb(II) and possibly U(VI) are bound by a mechanism similar to Cu, whereas the coordination of Co(II), Cd(II), Fe(III), Mn(II), Ni(II) and Zn(II) by mb differs from Cu(II). Consistent with its role as a copper-binding compound or chalkophore, the binding constants of all the metals examined were less than those observed with Cu(II) and copper displaced other metals except Ag(I) and Au(III) bound to mb. However, the binding of different metals by mb suggests that methanotrophic activity also may play a role in either the solubilization or immobilization of many metals in situ. 相似文献
16.
Summary Cabbage plants were grown for 55 days with a nutrient solution containing 1 and 10 ppm of V, Cr(III), Cr(VI), Mn, Fe, Co, Ni, Cu, Zn, Cd, Hg(I), orHg(II). A comparison of the plant growth and chemical analysis revealed that Cr(VI), Cu, Cd, and Hg(II) in the solution are most toxic to the plant growth (hence detrimental to the cabbage-head formation) and Mn, Fe, and Zn are less toxic than other heavy metals, and that Mn, Zn, Co, Ni, and Cd and translocated into all the plant organs while V, Cr(III), Cr(VI), Fe, Cu, Hg(I), and Hg(II) are accumulated in the roots. 相似文献
17.
In order to determine any possible relation between chemical composition of a person’s blood to formation of dental caries,
whole blood was analyzed for 35 inorganic elements (Si, Al, Fe, Ca, Mg, K, Mn, Ti, P, Li, Be, B, V, Cr, Co, Ni, Cu, Zn, As,
Sr, Y, Nb, Mo, Ag, Cd, Sn, Sb, Ba, La, Ce, W, Pb, Bi, Zr, and F) in the 15 people having sound teeth as well as an equal number
of those having multiple caries. The results showed the absence of 13 elements (Si, Al, Mn, Ti, Be, Co, As, Y, Cd, Ba, La,
Ce, and Zr) in the blood of both groups. Of the remaining 22 elements, the results of only seven elements (Fe, P, B, V, Sr,
Sn, and F) were significantly different between the two groups. The most remarkable finding of this study was significantly
decreased amount of phosphorus, strontium, and fluorine and perhaps increased boron in the blood of persons with caries. 相似文献
18.
Distinct metal-binding configurations in metallothionein 总被引:9,自引:0,他引:9
In a study of the binding stoichiometry of various metals to rat liver metallothionein, the protein appears to coordinate metals in 2 distinct configurations. Ions of at least 18 different metals were shown to associate with the protein suggesting that there is little specificity in binding. Most metals exhibited saturation binding at 7 mol eq forming M7-metallothionein. These included Bi(III), Cd(II), Co(II), Hg(II), In(III), Ni(II), Pb(II), Sb(III), and Zn(II). Others metals including Os(III), Pd(II), Pt(IV), Re(V), Rh(III), and Tl(III) give a positive indication of binding, but stoichiometries were unclear. Ag(I) and Cu(I) bound in clusters as M12-metallothionein. This binding stoichiometry was determined in 3 ways: (a) by determining the equivalence point in Cu- and Ag-titrated samples where resistance to proteolysis is maximal; (b) by determining the point where Zn ions are completely displaced from Zn7-metallothionein; and (c) by direct binding studies. Ag-reconstituted protein, recovered from gel filtration, had an average Ag content of 11.5 g atoms/mol of protein. A similar stoichiometry for the Cu-protein resulted from displacement of Zn from Zn7-metallothionein by Cu(I). The M12-protein was converted to the M7-protein by displacement of Ag(I) or Cu(I) with 7 mol eq of Hg(II). Whereas the distribution of metals in the 2 domains of M7-metallothionein is M4 alpha and M3 beta, the arrangement in the M12-molecule is probably M6 alpha and M6 beta. We propose that metallothionein ligates Ag(I) and Cu(I) in a trigonal geometry by bridging thiolates. This is in contradistinction to a tetrahedral binding geometry in the M7-protein. Distinct binding configurations may result in different tertiary structures for M7- and M12-proteins which may relate to metabolic specificity of Zn-metallothionein and Cu-metallothionein, respectively. 相似文献
19.
Dong W. Choi Young S. Do Corbin J. Zea Marcus T. McEllistrem Sung-W. Lee Jeremy D. Semrau Nicola L. Pohl Clint J. Kisting Lori L. Scardino Scott C. Hartsel Eric S. Boyd Gill G. Geesey Theran P. Riedel Peter H. Shafe Kim A. Kranski John R. Tritsch William E. Antholine Alan A. DiSpirito 《Journal of inorganic biochemistry》2006,100(12):2150
Methanobactin (mb) is a novel chromopeptide that appears to function as the extracellular component of a copper acquisition system in methanotrophic bacteria. To examine this potential physiological role, and to distinguish it from iron binding siderophores, the spectral (UV–visible absorption, circular dichroism, fluorescence, and X-ray photoelectron) and thermodynamic properties of metal binding by mb were examined. In the absence of Cu(II) or Cu(I), mb will bind Ag(I), Au(III), Co(II), Cd(II), Fe(III), Hg(II), Mn(II), Ni(II), Pb(II), U(VI), or Zn(II), but not Ba(II), Ca(II), La(II), Mg(II), and Sr(II). The results suggest metals such as Ag(I), Au(III), Hg(II), Pb(II) and possibly U(VI) are bound by a mechanism similar to Cu, whereas the coordination of Co(II), Cd(II), Fe(III), Mn(II), Ni(II) and Zn(II) by mb differs from Cu(II). Consistent with its role as a copper-binding compound or chalkophore, the binding constants of all the metals examined were less than those observed with Cu(II) and copper displaced other metals except Ag(I) and Au(III) bound to mb. However, the binding of different metals by mb suggests that methanotrophic activity also may play a role in either the solubilization or immobilization of many metals in situ. 相似文献
20.
The induction of phytochelatins (PCs) and their desglycyl peptides (both are referred to as class III metallothionein [CIIIMT]) by exposure to various metals (Ag+, As3+, As5+, Cd2+, Cu2+, Ga3+, Hg2+, In3+, Ni2+, Pb2+, Pd2+, Se4+, and Zn2+) and the metal composition in the CIIIMTs were investigated in root cultures of Rubia tinctorum L. All of these metal species induced PCs to various degrees when analyzed by the postcolumn derivatization high-performance liquid chromatography method. The desglycyl peptides of PCs often were also present. However, only Ag, Cd, and Cu were bound to the CIIIMTs that they induced when analyzed by the high-performance liquid chromatography-inductively coupled plasma-atomic emission spectrometry method. Cu was also bound to the CIIIMTs induced by Ag+, As3+, and Cd2+. After Ag+ exposure, an Fe peak that may be of Fe-CIIIMT was also observed. However, most of the metal species studied were not bound to the CIIIMTs that they induced. 相似文献