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We have manually checked the above educational sources, so feel free to use them for your academic success. Expert assistance with term papers, research papers, thesis and dissertations. Plagiarism checker - ps. College writing can be easy. Follow our professional tips and guides and secure your grade! In this paper, two organ-ochlorine compound mass spectra classification systems were proposed. The classification models were developed within the framework of artificial neural networks ANNs and fast 1D and 2D molecular descriptor calculations.

Based on the intensities of two characteristic MS peaks, namely, [M] and [M], two classification criterions were proposed. According to criterion I, class 1 comprises [M] signals with the intensity higher than NIST units, while class 2 consists of signals with the intensity lower or equal than According to criterion II, class 1 consists of [M] signals with the intensity higher than , while signals with the intensity lower or equal than belong to class 2.

As a result of ANNs learning stage, five models for both classification criterions were generated.

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The external model validation showed that all ANNs are characterized by high predicting power; however, criterion I-based ANNs are much more accurate and therefore are more suitable for analytical purposes. In order to obtain another confirmation, selected ANNs were tested against additional dataset comprising popular sunscreen agents disin-fection by-products reported in previous works.

Granular activated charcoal from peanut Arachis hypogea shell as a new candidate for stabilization of arsenic in soil.

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Composite formation with silicate materials and adsorption mechanism for As were corroborated by attenuated total-reflection Fourier-transform infrared spectroscopy. Moreover, 0. Assessment of As stabilization was achieved by a fit-to-purpose BCR sequential soil extraction procedure extraction of the water-soluble and carbonatic fraction with 0. Arsenic phytoavailability was estimated by leaching with 0.

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Samples were analyzed by inductively coupled plasma sector field mass spectrometer applying high resolution mode. Total-reflection X-ray fluorescence spectrometer was used to check data accuracy.

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Stabilization efficiency did not improve by using OA. The amounts of immobilized As increased almost proportionally with the higher AC application rate by doubling the iAs V dose.

iprilenve.tk Similarly, studies conducted on solutions proved that As adsorption onto ACs was slightly exponential. Sequential extraction was used to fractionate heavy metals Cd and Zn from the Abattoir, Bukuru and Busa Buji dumpsites. Water samples were collected from 6 wells located near the dumpsites at different proximities for the assessment of Water samples were collected from 6 wells located near the dumpsites at different proximities for the assessment of concentration of metals leached from the various sites and analyzed for pH, color, turbidity, total hardness, alkalinity, cadmium and zinc heavy metals.

From the results, pH of the water was slightly acidic 6. Among the metals examined, zinc has the mean concentration of 5. The concentration of metals in the well water also varied based on their proximities to the dumpsites.

Zinc has the mean concentration of 1. Cadmium has the mean concentration of 0. Analysis of the extracts was carried out by atomic absorption spectrometry AAS. All the metals analyzed were above the maximum acceptable limits by WHO Zn 5.

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The study concludes that the hand dug well water around the refuse dumps sites are not safe for human consumption. Mangroves are environments that have fast cycles associated with high concentration of bacterial decomposers. These are impacted by anthropogenic pollution due to contamination of bacterial species carrying resistance genes. This study This study aims to evaluate the metabolic profile of the microbiota in mangrove sediments, and verify the presence of Gram-negative bacteria resistant to meropenem. The samples were obtained from location along the Anil river and were seeded in medium supplemented with the antibiotic meropenem in increasing concentrations.

The results of the six bacterial isolates showed the bla KPC-2 gene and were identified as Stenotrophomonas maltophilia and Pseudomonas putida. The samples showed a greater diversity Shannon index, a rich substrate consumption and high equity. Ammonia formation by a thiolate-bridged diiron amide complex as a nitrogenase mimic.

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Although nitrogenase enzymes routinely convert molecular nitrogen into ammonia under ambient temperature and pressure, this reaction is currently carried out industrially using the Haber-Bosch process, which requires extreme temperatures Although nitrogenase enzymes routinely convert molecular nitrogen into ammonia under ambient temperature and pressure, this reaction is currently carried out industrially using the Haber-Bosch process, which requires extreme temperatures and pressures to activate dinitrogen. Biological fixation occurs through dinitrogen and reduced NxHy species at multi-iron centres of compounds bearing sulfur ligands, but it is difficult to elucidate the mechanistic details and to obtain stable model intermediate complexes for further investigation.

Metal-based synthetic models have been applied to reveal partial details, although most models involve a mononuclear system. Notably, the final ammonia release was effected with water as the proton source. Density functional theory calculations were carried out, and a pathway of biological nitrogen fixation is proposed.

Green chemistry, biofuels, and biorefinery. In the current climate of several interrelated impending global crises, namely, climate change, chemicals, energy, and oil, the impact of green chemistry with respect to chemicals and biofuels generated from within a holistic concept of a In the current climate of several interrelated impending global crises, namely, climate change, chemicals, energy, and oil, the impact of green chemistry with respect to chemicals and biofuels generated from within a holistic concept of a biorefinery is discussed.

Green chemistry provides unique opportunities for innovation via product substitution, new feedstock generation, catalysis in aqueous media, utilization of microwaves, and scope for alternative or natural solvents. The potential of utilizing waste as a new resource and the development of integrated facilities producing multiple products from biomass is discussed under the guise of biorefineries.

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Biofuels are discussed in depth, as they not only provide fuel energy but are also a source of feedstock chemicals. In the future, the commercial success of biofuels commensurate with consumer demand will depend on the availability of new green bio chemical technologies capable of converting waste biomass to fuel in a context of All plants and animals must have water to survive. If there was no water there would be no life on earth. Various factors play a part in this worrying state of affairs in India, These series of experiments allowed us to see the effects of reducing sugars, starch, lipids, and proteins when they interest with different agents.

Cocaine in Money The paper "Cocaine in Money" is a great example of a chemistry lab report.

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This experiment aims at finding out whether some money is contaminated with cocaine. Cocaine is amongst the money banned hard drugs due to its effect on the human system when abused. The drug, however, is always illegally circulating, with so many criminals handling it. Thermoplastic Polyester Elastomer The paper "Thermoplastic Polyester Elastomer" is a worthy example of a chemistry assignment. Synthetic organic silicates that broke in the polymer nanocomposites are customized with a surfactant modifier. Most of the surveys show that the segments of copolymers like TPE-Es when engaged, they result in the connection with different segments.

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Gas detector tubes by definition are thin glass tubes with calibration scales printed on them whereby the concentrations of the substance vapors and gases that is to be measured is directly read. The lab experiment goal performed during this experiment was to find out all the factors that affect the intensity of the color solution and how fun colors are that will aid in developing theological background information on how these factors relate to food coloring products.

White phosphorous is a chemical substance which ignites and burns while exposed to oxygen and consequently generates dense white smoke. This substance is made from an allotrope of the chemical element phosphorus. The white phosphorous or WP is mainly used for military purposes.

Enantiomers are the chiral molecules with the same physical properties except for the rotational direction of the plane-polarized light. One enantiomer will rotate the polarized light in the clockwise direction and another in the anti-clockwise direction. This experiment involved testing the physical properties of metals including brittleness and their hardness. The experiment in this paper also involved determining the corrosion on the metal. Vanadium is mostly used to make alloys for tools, construction elements, and engine parts.