The study was conducted to identify the toxicity of chromium on scenedesmus quadricauda algae alone and in the presence of nutrient metal (Nitrogen). Different concentrations of chromium (0.5, 1.5 , 2.5, 3.5 , 4.5mg/L) were used and the presence nitrogen is (5 ,10 ,50 ,100mg/L) on cultur media(chu-10) with used for cultivation of the algae in controlled conditions(25oC , light intensity 380 –?E/m2 /s. The results showed increasing in the toxicity of the metal when is alone , excess of concentrations an time of exposure. The growth rate decreased from 0.44 to 0.06 cell/ hour after 12 day of the biging of the experiment and of concentrate 4.5 mg/L of chromium. The intermediate active concentrations of the chromium(EC50) was increased after 96 hours from the exposure, which it reached alevel at 3mg/L, which the increase of rate of inhibition which became 64, 80, 87 and 90% respectively with above mentioned concentrations of chromium. While after increasing the nitrogen concentrations in the culture media , an decrease was detected in the toxicity of the chromium at 3mg/L . Level through the increase in growth rate reached 0.30 cell /hour after the addition of 5mg/L of Nitrogen to the culture media which contain 3mg/L of chromium. This increase was also a companied by a decrease in rate of inhibition at a level of 74%, 69%, 78%, 70% respectively with the above mentioned treatment concentrations. From the above results it could be concluded that the toxicity of chromium may be declined under the effect of the Nitrogen
Avec Jacques Prévert la poésie entre dans la vie quotidienne, avec des mots de tous les jours que comprennent même les enfants. Son recours à la langue parlée sert comme un outil pour exprimer sa contestation contre l’ordre établi. Adolescent pendant la première guerre mondiale, il était témoin du massacre de toute la génération précédente. Il manifeste une aversion profonde pour la guerre et les militaires. Il déteste également les prêtres, les politiciens et l’armée qui sont, pour lui, les responsables de l’amertume de la génération. À ce mouvement de la contestation d’une société, le poète répond par l’offre de valeurs positives qui changeront l’ordre du monde. Il propose d’ailleurs la vitalité c
... Show MoreIndustrial and urban development has resulted in the spread of plastic waste and the increase in the emissions of carbon dioxide resulting from the cement manufacturing process. The current research aims to produce green (environmentally friendly) concrete by using plastic waste as coarse aggregates in different proportions (10% and 20%) and nano silica sand powder as an alternative to cement in different proportions (5% and 10% by weight). The results showed that compressive strength decreased by 12.10% and 19.23% for 10% and 20% plastic waste replacement and increased by 12.89% and 20.39% for 5% and 10% silica sand replacement respectively at 28 days. Flexural strength decreased by 12.95% and 19.64% for 10% and 20% plastic waste r
... Show MoreThe increase in the Iraqi population put pressure on urban cities as there were no new cities built since the 1980s due to the wars and the economic blockade imposed in 1991 and the deteriorating security situation after 2003, where the population in 2018 reached about forty million people. Iraq also suffered during the past decades from problems and challenges in many respects that affected the local environment, and the constructed buildings had a role in increasing these impacts, so the Ministry of Housing worked to issue the Iraqi Green Architecture Code in 2019 to reduce damage to the environment and use resources more efficiently. And because the constructed buildings were not constructed according to green standards, including Bas
... Show MoreMake a search on the vegetative parts of the plant local horse guilt of some elements in the Haj Omran area in northern Iraq has included recognition of certain nutrients
Government expenditure represents one of the controlling financial policies in the economic affairs and management of the economic cycle in order to achieve price stability, raise the rate of output growth and decrease the level of unemployment. The price stability represents one of the macroeconomic goals that all countries seek without exception, regardless of the economic philosophy adopted by each country; in addition to this is raising the productive capacity and reaching the actual output to the level of the expected output, that is, the level of output related to the natural unemployment rate or what is sometimes called the Non-inflationary unemployment rate. The restriction of government expenditure (G=T+∆B/iP+∆M/P) is
... Show MorePoly aniline-formaldehyde/chitosan composite (PAFC) was prepared by the in situ polymerization method. It was characterized by FTIR spectroscopy in addition to SEM, EDS and TGA techniques. The adsorption kinetics of malachite green dye (MG) on (PAFC) were studied for various initial concentrations (20, 30 and 40) mg/L at three temperatures (308, 313 and 318) K. The influence factors of adsorption; adsorbent dose, contact time, initial concentration and temperature were investigated. The kinetic studies confirmed that adsorption of MG obeyed the pseudo-second-order model and the adsorption can be controlled through external mass transfer followed by intraparticle diffusion mass transfer. A study of th
The Eurasia Proceedings of Science Technology Engineering and Mathematics | Volume: 6
In this paper, the relationship between urban growth, land use, site availability, and impacts on the general appearance of the city generated by functional characteristics of port cities were analyzed. Various data were used to identify patterns of land use change and city growth and expansion. The research aims to analyze the impact of the port on the growth of the city, study the urban growth of the city of Umm Qasr and predicting the growth trends, and to identify the most influential factors in this growth. The study dealt with the concepts of urban growth and the factors that characterize the growth of port cities and the current situation of the city. The practical part included the mechanisms used by the researcher to analyze the
... Show MoreHierarchy of the difficulty of texts in the translation process from a lexical-textual perspectiveTranslation has been classified from the beginning into many categories. This categorization was carried out from a typological perspective of a lexical-textual nature. At the lexical level, the translation gave great interest in the specialty of the terms or what is called the specialized language in which words with their own meanings are used, ignoring their common meanings, since a word, in addition to its common meaning could give more than one meaning to what are called in lexicographical works as meanings, since a word can carry a meaning of a scientific nature in a scientific text, legal in a legal text, political in a political text, l
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