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The term "Lower Niger Bronze Industry" has been used by art historians to classify ancient copper-alloy sculpture discovered in the area of the Niger Valley that could not be traced
contactDuring the green synthesis, the biomolecules present in the sample extract reduce the Cu 2+ ion to Cu 0 state and simultaneously oxidize it to form CuO nanoparticles. Certain
contactDownload scientific diagram | Polyphosphate profile of A. niger cultivated in the absence and presence of copper. from publication: Copper-induced adaptation, oxidative stress and its
contactThe extraction rate of nickel, copper, iron, and magnesium of 91.6%, 88.5%, 28.4%, and 16.4% was obtained under the optimal conditions that the roasting time was 3 h, the
contactIn an effort to develop alternate techniques to recover metals from waste electrical and electronic equipment (WEEE), this research evaluated the bioleaching efficiency of gold
contactLeaching of copper converter slag of M/s Hindustan Copper Ltd, Ghatshila (Bihar, India) was carried out usingAspergillus niger culture filtrate. The effects of the duration of leaching,
contactCopper (Cu) is a necessary trace mineral due to its biological activity. Excessive Cu can induce inflammatory response in humans and animals, but the underlying mechanism is
contact202253 · Iron is essential for both alloys because it provides added resistance to corrosion caused by velocity effects called impingement attack. Figure 1 shows the effect of iron content on the impingement attack on 90-10 Cu-Ni from 30-day tests obtained at 3 m/s water velocity. This is taken from the data compiled by various authors and different test
contact2021105 · The attention has been paid in recent years to the biosynthesis of copper nanoparticles (CuNPs) and their important in medical applications. This study was conducted to synthesis of CuNPs using Aspergillus niger supernatant, study its characteristic and their antibacterial activity alone or with Ciprofloxacin against Staphylococcus aureus
contact202237 · The CuNPs showed considerable antifungal activity against Aspergillus flavus and Aspergillus niger with inhibition activity of 8.0 ± 2.83 mm and 3.0 ± 4.24 mm respectively.
contact2023214 · During the green synthesis, the biomolecules present in the sample extract reduce the Cu 2+ ion to Cu 0 state and simultaneously oxidize it to form CuO nanoparticles. Certain biomolecules found in the sample extract serve as a capping agent and also aid in the stabilization of the produced nanoparticles ( 43 ). 2.2.
contact2022127 · Abstract and Figures. Copper and Copper oxide nanoparticles have garnered a lot of attention among the metal oxide nanoparticles, especially because of their many characteristics and applications ...
contact201361 · Copper oxide (CuO) nanoparticles and nanolayers were synthesized by sol–gel and spray pyrolysis methods, respectively. The structure and morphology of the prepared samples were characterized using XRD, SEM and TEM analysis. Aspergillus niger fungi were grown in an appropriate medium and exposed to the synthesized samples in a
contact2021430 · The Kalana (80%) gold project has the potential to produce 150,000 oz. per year, according to the company. The reserve estimate was updated earlier this year to proven and probable reserve of 35.6 ...
contact20211020 · Temperatures in the region are rising 1.5 times faster than in the rest of the world. By 2100, experts are predicting a three to six degrees Celsius rise in temperature which will worsen food security, water scarcity, and further aggravate conflicts and humanitarian crises. More than 80% of Niger's population depends on agriculture and
contact199651 · Nonliving waste biomass consisting of Aspergillus niger attached to wheat bran was used as a biosorbent for the removal of copper and zinc from aqueous solutions. Copper and zinc uptake by the biomass obeyed Langmuir isotherms. The binding capacity of the biomass for copper was found to be higher than that for zinc. The metal uptake,
contact2023321 · Niger, officially Republic of Niger, French République du Niger, landlocked western African country. It is bounded on the northwest by Algeria, on the northeast by Libya, on the east by Chad, on the south by Nigeria and Benin, and on the west by Burkina Faso and Mali. The capital is Niamey. The country takes its name from the Niger River,
contact2023320 · Niger has a population of 17,8 million people (est. 2013), it is the country with the highest total fertility rate (7,6 children each woman). Capital and largest city is Niamey, spoken languages are French (official), but also Hausa, Zarma, Songhay, Arabic and half a dozen other languages. 95% of Niger's population are Muslims.
contactA copper-alloy adornment, this necklace was created in the ancient center of Jenne. Jenne's central location on numerous pivotal trade routes contributed to its prosperity and the development of a complex and highly urbanized social structure. ... Culture: Middle Niger civilization. Medium: Copper alloy (cast), cotton cord. Dimensions: W. 2 5/ ...
contact202237 · The CuNPs showed considerable antifungal activity against Aspergillus flavus and Aspergillus niger with inhibition activity of 8.0 ± 2.83 mm and 3.0 ± 4.24 mm respectively.
contact2022127 · Abstract and Figures. Copper and Copper oxide nanoparticles have garnered a lot of attention among the metal oxide nanoparticles, especially because of their many characteristics and applications ...
contact2021430 · The Kalana (80%) gold project has the potential to produce 150,000 oz. per year, according to the company. The reserve estimate was updated earlier this year to proven and probable reserve of 35.6 ...
contact20211020 · Temperatures in the region are rising 1.5 times faster than in the rest of the world. By 2100, experts are predicting a three to six degrees Celsius rise in temperature which will worsen food security, water scarcity, and further aggravate conflicts and humanitarian crises. More than 80% of Niger's population depends on agriculture and
contactLeaching of copper converter slag of M/s Hindustan Copper Ltd, Ghatshila (Bihar, India) was carried out usingAspergillus niger culture filtrate. The effects of the duration of leaching, temperature, pulp density and the addition of hydrochloric acid were studied.A. niger culture filtrate solubilized metals from the converter slag at levels of 18.70% copper, 7.40%
contactThis study assesses the ability of mycelia of Aspergillus niger B-77 (both free and immobilized on polyurethane foam) to remove copper from single-ion solution. All experiments were conducted using 0.5 mM solutions of CuSO4·5H2 O. Mycelia immobilized on polyurethane foam cells showed a three-fold increase in uptake, compared with that
contact202143 · The so-called Chalcolithic - or the Copper Age - is one of the great eras of cultural development, fitting into the main framework of man’s crucial steps towards civilization. This period introduced copper into the metalworking industry, ushering the world into a wholly new phase, and paving the way towards the use of bronze.
contact2019121 · Impact of oil dependency. Nigeria’s transition to democratic rule in 1999 produced mixed reactions as it emboldened ethnic grievances and gave impetus to the expression of minority rights which were previously reprised by dictators. Consequently, the threat of insurgency in the Niger Delta cut Nigeria’s oil production by 650 barrels per day ...
contact2023320 · Niger has a population of 17,8 million people (est. 2013), it is the country with the highest total fertility rate (7,6 children each woman). Capital and largest city is Niamey, spoken languages are French (official), but also Hausa, Zarma, Songhay, Arabic and half a dozen other languages. 95% of Niger's population are Muslims.
contact201717 · This work elucidates spatio-temporal aspects of the biogeochemical transformation of copper mobilized from malachite (Cu 2 (CO 3)(OH) 2) and bioaccumulated within Aspergillus niger colonies when grown on different inorganic nitrogen sources. It was shown that the use of either ammonium or nitrate determined how copper was distributed
contact200351 · A study was initiated to determine the feasibility of using the fungus Aspergillus niger for bioleaching metals from oxide low-grade ore. Large quantities of the metals are embodied in the low-grade ores and mining residues that can be recovered. Presently available techniques (pyrometallurgical and hydrometallurgical) are expensive
contact2020611 · Rare earth elements (REE) are essential in high-technology and environmental applications, where their importance and demand have grown enormously over the past decades. Many lanthanide and actinide minerals in nature are phosphates. Minerals like monazite occur in small concentrations in common rocks that resist
contact200342 · Presently available techniques (pyrometallurgical and hydrometallurgical) are expensive or may have a negative impact on the environment. An oxidized mining ore containing mainly copper (7245 mg kg −1 residue) was studied. In this study, the fungus A niger produced a variety of organic acids. Addition of small quantities of sulfuric acid ...
contactA copper-alloy adornment, this necklace was created in the ancient center of Jenne. Jenne's central location on numerous pivotal trade routes contributed to its prosperity and the development of a complex and highly urbanized social structure. ... Culture: Middle Niger civilization. Medium: Copper alloy (cast), cotton cord. Dimensions: W. 2 5/ ...
contact2015101 · The metal removed from the cultures exposed to 0.5mM, 1mM and 2mM copper exhibited percentages of removal equivalent to 75.78%, 66.04% and 33.51%. The results indicate that the isolate was able to grow in high concentrations of copper, activates mechanisms for adaptation and tolerance in the presence of metal, and is highly efficient
contact20221231 · MCC’s $442.6 million compact is addressing two major constraints to economic growth and investment in Niger: lack of access to water for productive uses and physical access and institutional barriers
contact2021121 · Metabolomic and secretomic analyses of Aspergillus niger IOC 4687 indicated the features of resistance of this strain to copper stress. To investigate the metabolites produced under oxidative stress conditions, gas chromatography-mass spectrometry analysis was performed. The secretome principal comp
contactCopper sulphate can be used as an algaecide water treatment to rid ponds and lakes, and swimming pools of excess algae. High amounts of algae can cause other issues in the water and copper sulphate is a safe way to treat the water without compromising ecosystem sustainability. It is usually not toxic to fish except in koi, goldfish, and trout.
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