scholarly journals The effects of trace elements, cations, and environmental conditions on protocatechuate 3,4-dioxygenase activity

2013 ◽  
Vol 70 (2) ◽  
pp. 68-73 ◽  
Author(s):  
Andréa Scaramal da Silva ◽  
Rodrigo Josemar Seminoti Jacques ◽  
Robson Andreazza ◽  
Fátima Menezes Bento ◽  
Flávio Anastácio de Oliveira Camargo
Keyword(s):  
Trace Elements ◽  
Environmental Conditions ◽  
Dioxygenase Activity

Metal Hyperaccumulator Plants and Environmental Pollution

2018 ◽  
pp. 305-317 ◽  
Author(s):  
Satish Chandra ◽  
Yogendra Singh Gusain ◽  
Arun Bhatt
Keyword(s):  
Trace Elements ◽  
Environmental Conditions ◽  
Life Forms ◽  
Metal Hyperaccumulation ◽  
Pioneer Plants ◽  
Potentially Toxic Trace Elements ◽  
History Of ◽  
High Concentrations ◽  
Angiosperm Species ◽  
Life On Earth

During evolutionary history of life on Earth, different life forms have undergone harsh environmental conditions. Plants have evolved multiple life forms and some of the specialist pioneer plants have the ability to colonize in hostile environmental conditions. Some plant taxa have the ability to accumulate high concentrations of potentially toxic trace elements (Ni, Zn, Cd, Se, As, Mn, Co, Cu, Pb, Sb, Tl) in their biomass. In some of these, taxa concentration of trace elements exceeds the concentration of macronutrients (e.g., Ca, K). Furthermore, metal hyperaccumulation is strongly associated with enhanced ability of these plants to detoxify the accumulated metal in the tissues. Such hyperaccumulation property has been reported in a total of approximately 500 Angiosperm species. This ability of the plants can be used for pollutant stabilization, extraction, degradation, or volatilization. The present chapter discusses heavy metals uptake mechanisms by plants and the potential of phytoremediation technique on treating heavy metal contaminated sides.

scholarly journals Evidence for the non-influence of salinity variability on the <i>Porites</i> coral Sr/Ca palaeothermometer

2015 ◽  
Vol 11 (3) ◽  
pp. 523-532 ◽  
Author(s):  
M. Moreau ◽  
T. Corrège ◽  
E. P. Dassié ◽  
F. Le Cornec
Keyword(s):  
Trace Elements ◽  
Environmental Conditions ◽  
Laboratory Experiments ◽  
Coral Species ◽  
Sea Surface ◽  
Simple Ocean Data Assimilation ◽  
Salinity Effect ◽  
Ocean Data Assimilation ◽  
Porites Coral ◽  
Salinity Variability

Abstract. Porites coral-based sea surface temperature (SST) reconstructions are obtained from the measurement of skeleton Sr/Ca ratio. However, the influence of salinity in the incorporation of these trace elements in the Porites aragonitic skeleton is still poorly documented. Laboratory experiments indicate that in three different coral species (not including the widely used Porites genus), salinity does not influence the Sr/Ca thermometer. In this study, we test the salinity effect on Porites Sr/Ca-based SST reconstructions at monthly and interannual timescales in open-ocean environmental conditions. We use a large spatial compilation of published Porites data from the Red Sea and Pacific and Indian oceans. Additionally to those published records, we add a new eastern Pacific coral Sr/Ca record from Clipperton Atoll. Using two different salinity products (Simple Ocean Data Assimilation (SODA) SSS reanalyses version 2.2.4, Carton and Giese, 2008; and instrumental SSS from the Institut de Recherche pour le Développement, France (IRD) Delcroix et al., 2011), we find no evidence of salinity bias on the Sr/Ca SST proxy at monthly and interannual timescales. We conclude that Porites Sr/Ca is a reliable palaeothermometer that is not influenced by salinity variability.

RATIONAL APPLICATION OF FOLIAR DRESSING BASED ON AGROCHEMICALS TO INCREASE THE PRODUCTIVITY OF GRAPE PLANTATIONS

2020 ◽  
Author(s):  
N.A. Tikhomirova ◽  
◽  
M.R. Beibulatov ◽  
N.A. Urdenko ◽  
R.A. Buival
Keyword(s):  
Trace Elements ◽  
Mineral Nutrition ◽  
Stress Resistance ◽  
Environmental Conditions ◽  
Plant Immunity ◽  
Close Correlation ◽  
Optimal Combination ◽  
Biological Productivity ◽  
Adverse Environmental Conditions ◽  
Grape Varieties

A study of the influence of foliar top dressing based on agrochemicals made it possible to establish a close correlation between the need of plants for elements of mineral nutrition and the total biological productivity of the grape bush. Trace elements contributed to the accelerated development of plants, increase stress resistance to adverse environmental conditions, increase plant immunity. As a result of the research, the optimal combination of foliar top dressing based on agrochemicals was revealed, which provides high agrobiological and economic indicators for the studied grape varieties with systemic use.

scholarly journals TESTATEAMOEBAE AS BIO-INDICATORS OF CONTAMINATION BY TRACE ELEMENTS IN THE RESERVOIR OF SALTO GRANDE AMERICANA-SP, BRAZIL

2018 ◽  
Vol 2 (4) ◽  
pp. 183-200 ◽  
Author(s):  
Maria Laura Misailidis ◽  
Nicolás Misailidis Strikis ◽  
Rubens Cesar Figueira ◽  
Renato Campello Cordeiro ◽  
Pedro Carlos Strikis ◽  
...  
Keyword(s):  
Trace Elements ◽  
Morphometric Analysis ◽  
Environmental Conditions ◽  
Sedimentary Facies ◽  
Testate Amoebae ◽  
Sediment Contamination ◽  
Significant Decline ◽  
Aquatic Environments ◽  
Icp Oes ◽  
Paulo State

This work aims to evaluate the degree of sediment contamination and the response of Testate amoebae populations through a sediment core taken from the Salto Grande Reservoir (RSG), situated in Americana, in São Paulo State (SP), Brazil. It is based on the analysis of the trace elements geochemistry (by ICP-OES) and Testate amoebae data (by stereomicroscopic morphometric analysis). The indices of homogeneity and richness (Simpson 1-D and Margalef) were calculated. Sediment contamination was evaluated according to VGQS (TEL and PEL). The results evidenced that the sediments of Facies 3 are highly contaminated since the beginning of RSG filling. Contamination caused significant decline of Testate amoebae populations dimension and diversity. In sedimentary facies with lower concentrations of trace elements diversity and size of Testate amoebae populations are higher and are composed of different species. The results of this work indicate that Testate amoebae populations showed differentiated responses to different environmental conditions. So, these amoeboid protists can be considered good indicators of pollution caused by trace elements in fresh water aquatic environments.

Microanalytical Identification of a New Zr-Nb-Fe Phase

1990 ◽  
Vol 48 (2) ◽  
pp. 132-133
Author(s):  
O.T. Woo ◽  
G.J.C. Carpenter
Keyword(s):  
Trace Elements ◽  
Cold Rolling ◽  
Proportionality Factor ◽  
Tube Material ◽  
X Ray ◽  
Metal Foils ◽  
Arc Melting ◽  
Intermetallic Particles ◽  
Intermetallic Precipitates ◽  
Cold Worked

To study the influence of trace elements on the corrosion and hydrogen ingress in Zr-2.5 Nb pressure tube material, buttons of this alloy containing up to 0.83 at% Fe were made by arc-melting. The buttons were then annealed at 973 K for three days, furnace cooled, followed by ≈80% cold-rolling. The microstructure of cold-worked Zr-2.5 at% Nb-0.83 at% Fe (Fig. 1) contained both β-Zr and intermetallic precipitates in the α-Zr grains. The particles were 0.1 to 0.7 μm in size, with shapes ranging from spherical to ellipsoidal and often contained faults. β-Zr appeared either roughly spherical or as irregular elongated patches, often extending to several micrometres.The composition of the intermetallic particles seen in Fig. 1 was determined using Van Cappellen’s extrapolation technique for energy dispersive X-ray analysis of thin metal foils. The method was employed to avoid corrections for absorption and fluorescence via the Cliff-Lorimer equation: CA/CB = kAB · IA/IB, where CA and CB are the concentrations by weight of the elements A and B, and IA and IB are the X-ray intensities; kAB is a proportionality factor.

Sign in / Sign up

Export Citation Format

Share Document