scholarly journals Evaluation of the effect of microorganisms in Arachis pintoi roots on the potential of copper absorption in land

2015 ◽  
Vol 18 (4) ◽  
pp. 138-152
Author(s):  
Nga Diep Yen Dang ◽  
Trong Thi Kim Pham
Keyword(s):  
Contaminated Soil ◽  
Low Cost ◽  
Root Nodules ◽  
The Other ◽  
Contaminated Sites ◽  
Copper Accumulation ◽  
Arachis Pintoi ◽  
Whole Plant ◽  
Copper Contaminated ◽  
Translocation Factors

The research was carried out to evaluate the potential phytoextraction and phytostability of perennial peanut (Arachis pintoi) and to determine the influence of the isolated microorganisms from the root nodules of Arachis pintoi on coppercontaminated soil to improve the ability of treatment metal in soil pollution. Perennial peanuts were planted in the experimental pots which had unsterilized and sterilized soil. Different quanlities of CuSO4.5H2O were directly homogenized into sieved soil to formulate mixtures containing Cu in concentrations (mg/kg) of 200, 400 and 600. In addition, sterilized soil was contaminated by adding Cu with 400 mg/kg. The other pots had copper- contaminated sterilized soil and was added the isolated microorganisms from the root nodules of Arachis pintoi. Our results showed that the perennial peanut had high phytomass production and grew normally in the soil with 200 mg/kg of Cu. The copper accumulation was determined of 668.2, 107 and 561.2 mg/kg in the whole plant, roots and shoots, respectively in plants which were cultivated in the soil with 200 mg/kg of Cu. In the soil with 400 mg/kg and 600 mg/kg of Cu, the plants showed low biomass production and the plants had been poisonous. Both bioconcentration factors (BCF) and translocation factors (TF) were used to estimate a plant’s potential for the purpose of phytoremediation. The highest BCF and TF for Cu concentrations were 3.341 and 5.24 with 200 mg/kg of Cu, respectively. Both factors were higher than 1 therefore Archis pintoi is a potential plant for copper phytoextraction in copper contaminated sites at the concentration of 200-400 mg/kg. The isolated microrganism from the root nodules of Arachis pintoi on copper- contaminated soil was Burkholderia kururiensi PR1, which was a species of proteobacteria and stimulated plant growth. However, the result showed that Burkholderia kururiensi is unable to resistant to concentration of copper (25 mg/L). More research on the other isolated microorganisms of the root system to enhance the Cu accumulation in plants should be carried. Finally, these results showed the potential of the heavy metal phytoextraction of the perennial peanut in contaminated soil. It is easy to apply because of the low cost.

scholarly journals Genes Conferring Copper Resistance inSinorhizobium melilotiCCNWSX0020 Also Promote the Growth ofMedicago lupulinain Copper-Contaminated Soil

2014 ◽  
Vol 80 (6) ◽  
pp. 1961-1971 ◽  
Author(s):  
Zhefei Li ◽  
Zhanqiang Ma ◽  
Xiuli Hao ◽  
Christopher Rensing ◽  
Gehong Wei
Keyword(s):  
Host Plant ◽  
Contaminated Soil ◽  
Copper Resistance ◽  
Inverse Pcr ◽  
Copper Accumulation ◽  
Wild Type ◽  
Transposon Insertion ◽  
Metal Binding Domain ◽  
Copper Contaminated ◽  
P Type

ABSTRACTSinorhizobium melilotiCCNWSX0020, isolated from root nodules ofMedicago lupulinagrowing in gold mine tailings in the northwest of China, displayed both copper resistance and growth promotion of leguminous plants in copper-contaminated soil. Nevertheless, the genetic and biochemical mechanisms responsible for copper resistance inS. melilotiCCNWSX0020 remained uncharacterized. To investigate genes involved in copper resistance, anS. melilotiCCNWSX0020 Tn5insertion library of 14,000 mutants was created. Five copper-sensitive mutants, named SXa-1, SXa-2, SXc-1, SXc-2, and SXn, were isolated, and the disrupted regions involved were identified by inverse PCR and subsequent sequencing. Both SXa-1 and SXa-2 carried a transposon insertion inlpxXL(SM0020_18047), encoding the LpxXL C-28 acyltransferase; SXc-1 and SXc-2 carried a transposon insertion inmerR(SM0020_29390), encoding the regulatory activator; SXn contained a transposon insertion inomp(SM0020_18792), encoding a hypothetical outer membrane protein. The results of reverse transcriptase PCR (RT-PCR) combined with transposon gene disruptions revealed thatSM0020_05862, encoding an unusual P-type ATPase, was regulated by the MerR protein. Analysis of the genome sequence showed that this P-type ATPase did not contain an N-terminal metal-binding domain or a CPC motif but rather TPCP compared with CopA fromEscherichia coli. Pot experiments were carried out to determine whether growth and copper accumulation of the host plantM. lupulinawere affected in the presence of the wild type or the different mutants. Soil samples were subjected to three levels of copper contamination, namely, the uncontaminated control and 47.36 and 142.08 mg/kg, and three replicates were conducted for each treatment. The results showed that the wild-typeS. melilotiCCNWSX0020 enabled the host plant to grow better and accumulate copper ions. The plant dry weight and copper content ofM. lupulinainoculated with the 5 copper-sensitive mutants significantly decreased in the presence of CuSO4.

Dewatering Design and Discuss of Foundation Pit Excavation in Disposal Site with Contaminated Soil

2013 ◽  
Vol 712-715 ◽  
pp. 946-950
Author(s):  
Guo Bao Ge ◽  
Zhi Ding ◽  
Xin Jiang Wei ◽  
Zhi Gang Nie
Keyword(s):  
Contaminated Soil ◽  
Polluted Soil ◽  
The Other ◽  
Contaminated Sites ◽  
Disposal Site ◽  
Foundation Pit ◽  
Other Hand ◽  
Soil Excavation ◽  
Specific Project

Foundation excavations support and dewatering method have been full-grown after years of development. However, during the excavation of polluted soil in special sites, dewatering scheme should not simply based on the experience and form of excavation but should be combined with the characteristics of contaminated sites so as to choose a reasonable dewatering method which meets the construction requirement of soil excavation on one hand and prevents the spread of contamination on the other hand. This paper design and analysis the dewatering of soil excavation in contaminated sites combined with specific project example.

scholarly journals Phytoremediation technology, plant response to environmental contaminants and the need for soil augmentation

2020 ◽  
Vol 12 (3) ◽  
pp. 486-499
Author(s):  
Ojo M. OSENI ◽  
Omotola E. DADA ◽  
Gideon O. OKUNLOLA ◽  
Ezekiel D. OLOWOLAJU ◽  
Michael S. AKINROPO ◽  
...  
Keyword(s):  
Plant Species ◽  
Contaminated Soil ◽  
Anthropogenic Activities ◽  
Low Cost ◽  
Environmental Contaminants ◽  
Environmentally Friendly ◽  
Plant Response ◽  
Contaminated Sites ◽  
Soil Air ◽  
Living Organisms

Contaminants in the environment occur naturally and/or through anthropogenic activities. These contaminants become a threat to all living organisms because of their increased in the environment and non-biodegradable nature. In order to protect the environment from these contamination, various techniques have been developed, and among them is phytoremediation. Phytoremediation is a technology that employed plant species for reclaiming contaminated soil, air, and water. This technology has been widely accepted in recent times, because of its low cost and environmentally friendly. In addition, augmentation of the contaminated soil, either chemo augmentation or bioaugmentation, have been used for the effective absorption of some of these contaminants. When the plants are grown in the contaminated sites, the contaminant in the soil maybe removed, immobilized, degraded or volatized. These phytoremediation technologies are: phytoextraction, phytovolatilization, rhizofiltration, phyto-stimulation, phyto-stabilization and phytodegradation. Based on the phytoremediation potentials of plants, pollutants are being removed from the environment thereby keeping the environment safe. 

SAE 1039

Alloy Digest ◽  
1977 ◽  
Vol 26 (2) ◽  
Keyword(s):  
Fracture Toughness ◽  
Low Cost ◽  
Manganese Content ◽  
Heat Treating ◽  
General Purpose ◽  
Carbon Steels ◽  
The Other ◽  
Steel Mills ◽  
Medium Strength ◽  
Hot Rolled

Abstract SAF 1039 steel can be used in the hot-rolled, normalized, oil-quenched-and-tempered or water-quenched-and-tempered condition for general-purpose construction and engineering. Its manganese content is a little higher than some of the other standard carbon steels with comparable carbon levels; this gives it slightly higher hardenability and hardness. It provides medium strength and toughness at low cost. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as fracture toughness. It also includes information on corrosion resistance as well as forming, heat treating, machining, joining, and surface treatment. Filing Code: CS-66. Producer or source: Carbon steel mills.

Using Low Temperature, Cost-effective and Green Methods to Carbon Nanohorn Synthesis

2019 ◽  
Vol 9 (2) ◽  
pp. 157-160
Author(s):  
Ali Hasani
Keyword(s):  
Laser Ablation ◽  
Melting Point ◽  
Palm Olein ◽  
Arc Discharge ◽  
Low Cost ◽  
The Other ◽  
High Yield ◽  
Reaction Field ◽  
Carbon Nanohorns ◽  
Graphite Rod

Background: Laser ablation method has high-yield and pure SWCNHs. On the other hand, arc discharge methods have low-cost production of SWCNHs. However, these techniques have more desirable features, they need special expertness to use high power laser or high current discharge that either of them produces very high temperature. As for the researches, the temperatures of these techniques are higher than 4727°C to vaporize the graphite. So, to become aware of the advantages of SWCNHs, it is necessary to find a new way to synthesize SWCNHs at a lower temperature. In other words, reaction field can be expandable at a moderate temperature. This paper reports a new way to synthesize SWCNHs at an extremely reduced temperature. Methods: According to this study, the role of N2 is the protection of the copper holder supporting the graphite rod by increasing heat transfer from the holder. After the current of 70 A was supplied to the system, the temperature of graphite rod was raised to 1600°C. It is obvious that this temperature is somehow higher than the melting point of palladium, 1555°C, and much lower than graphite melting point, 3497°C. Results: Based on the results, there are transitional precursors simultaneous with the SWCNHs. This composition can be created by distortion of the primary SWCNTs at the higher temperature. Subsequently, each SWCNTs have a tendency to be broken into individual horns. With increasing the concentration of the free horns, bud-like SWCNHs can be produced. Moreover, there are individual horns almost separated from the mass of single wall carbon nanohorns. This structure is not common in SWCNHs synthesized by the usual method such as arc discharge or laser ablation. Through these regular techniques, SWCNHs are synthesized as cumulative particles with diameters about 30-150 nm. Conclusion: A simple heating is needed for SWCNTs transformation to SWCNHs with the presence of palladium as catalyst. The well-thought-out mechanism for this transformation is that SWCNTs were initially changed to highly curled shape, and after that were formed into small independent horns. The other rout to synthesize SWCNHs is the pyrolysis of palm olein at 950°C with the assistance of zinc nitrate and ferrocene. Palm olein was used as a promising, bio-renewable and inexpensive carbon source for the production of carbon nanohorns.

scholarly journals A Local Oscillator Phase Compensation Technique for Ultra-Wideband Stepped-Frequency Continuous Wave Radar Based on a Low-Cost Software-Defined Radio

Sensors ◽  
2021 ◽  
Vol 21 (3) ◽  
pp. 780
Author(s):  
Kazunori Takahashi ◽  
Takashi Miwa
Keyword(s):  
Software Defined Radio ◽  
Initial Phase ◽  
Continuous Wave ◽  
Low Cost ◽  
Local Oscillator ◽  
The Other ◽  
Ultra Wideband ◽  
Single Frequency ◽  
Wave Radar ◽  
Stepped Frequency

The paper discusses a way to configure a stepped-frequency continuous wave (SFCW) radar using a low-cost software-defined radio (SDR). The most of high-end SDRs offer multiple transmitter (TX) and receiver (RX) channels, one of which can be used as the reference channel for compensating the initial phases of TX and RX local oscillator (LO) signals. It is same as how commercial vector network analyzers (VNAs) compensate for the LO initial phase. These SDRs can thus acquire phase-coherent in-phase and quadrature (I/Q) data without additional components and an SFCW radar can be easily configured. On the other hand, low-cost SDRs typically have only one transmitter and receiver. Therefore, the LO initial phase has to be compensated and the phases of the received I/Q signals have to be retrieved, preferably without employing an additional receiver and components to retain the system low-cost and simple. The present paper illustrates that the difference between the phases of TX and RX LO signals varies when the LO frequency is changed because of the timing of the commencement of the mixing. The paper then proposes a technique to compensate for the LO initial phases using the internal RF loopback of the transceiver chip and to reconstruct a pulse, which requires two streaming: one for the device under test (DUT) channel and the other for the internal RF loopback channel. The effect of the LO initial phase and the proposed method for the compensation are demonstrated by experiments at a single frequency and sweeping frequency, respectively. The results show that the proposed method can compensate for the LO initial phases and ultra-wideband (UWB) pulses can be reconstructed correctly from the data sampled by a low-cost SDR.

Study on the Effect of Exposure Duration on Recommended Target of Cd-Contaminated Soil Remediation

2011 ◽  
Vol 414 ◽  
pp. 214-220
Author(s):  
Xiao Song Sun ◽  
An Ping Liu ◽  
Hang Zhou ◽  
Xiao Nan Sun ◽  
Jian Ming Sun
Keyword(s):  
Risk Assessment ◽  
Health Risk ◽  
Soil Remediation ◽  
Health Risk Assessment ◽  
Contaminated Soil ◽  
Exposure Duration ◽  
Contaminated Sites ◽  
The Relationship

Based on the process of health risk assessment for Cd contaminated sites, study the relationship between exposure duration and recommended target of soil remediation. This paper discusses the changes (from 7.7 mg/kg to 5.0 mg/kg, from 9.1 mg/kg to 3.8 mg/kg) of recommended target for soil remediation when the exposure duration has large changes (EDa ranges from 6a to 36a, EDc ranges from 1a to 12a). The results point out that both EDa and EDc have effects on recommended target of soil remediation, and in general, exposure duration and recommended target of soil remediation vary inversely.

ON THE ETYMOLOGIC DERIVATION OF SOME COMMONLY USED WORDS IN PEDIATRICS: INFANT, CRETIN, MECONIUM, AND ICTERUS

PEDIATRICS ◽  
1970 ◽  
Vol 46 (6) ◽  
pp. 870-870
Author(s):  
T. E. Cone
Keyword(s):  
Newborn Infant ◽  
Newborn Infants ◽  
Old French ◽  
Intestinal Content ◽  
The Other ◽  
Roman Law ◽  
Whole Plant ◽  
Thick Juice ◽  
Brown Color

infant-from Latin infans; in (neg.) + fans speaking (fans is the participle). In Roman law infant means a child not old enough to talk... Cretin-Old French-chretien, a Christian. Perhaps used first as a perjorative term by the ancient Romans because to them the first Christians were stupid enough to "turn the other cheek" when attacked by mobs or by the lions in the Roman amphitheater. Meconium-from Greek mekonion meaning the poppy juice obtained from pressing the whole plant which gives a thick Juice of black, greenish-brown color. The intestinal content of the newborn infant has a similar consistency and appearance and so Galenadopted the term for the content of the bowels of newborn infants. (Meconism means the opium habit). lcterus-from Greek ikteros, a yellow bird, probably the golden thrush or a species of oriole. Pliny relates that if a person suffering from jaundice looks at a yellow bird, the bird will die and the patient recovers. Icterus was first used in pediatrics by Ludwig von Buhl (1816-1880) when he described icterus neonatorum.

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