Advances in Environmental Biology

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  • ISSN
    1998-1066

Publications in this journal

  • Advances in Environmental Biology 01/2014; 7(13):4022-4027.
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    ABSTRACT: Considering the closure of Paleotethys ocean in Iran, the expansion of Ophiolitic rocks complex on marginal areas of old Micro-continents of Iran is indicative of overthrust of remnants of the oceanic crust on the continental crust and often concentration of mineralization is observed in the plateau. In an area of 600 Km2 north of Naein-Ashin the Ophiolitic rocks complex mostly comprised of Serpentinite have been concentrated with tectonic relationship to the adjacent units. They have overthrust the Eocene and Miocene aged sedimentary rocks in northeastern parts of the region. This study is aimed at investigating some of the fundamental aspects of the tectonic relationships of field observations as well as the concentration and formation procedures of inorganic minerals like Magnesite and Hontite in fractures and veins resulting from the tectonic processes. With this aim in view, in the first stage the mineralization range was determined through field operations, provisioning of geological maps and sampling from concentration areas of the minerals and in the next stage the experimental investigations and sample analysis was performed using X-ray diffraction and X-ray fluorescence methods together with geochemistry and petrographic studies to determine the rate and depth of mineralization.Results of the structural geology, petrographic and geochemistry analyses showed that the ultrabasic rocks after the formation time have undergone at least one tectonic phase and the development of the joint and the fractures in the following stages have provided suitable points for penetration of Carbon dioxide-rich and magnesium ions-rich thermal solutions emanating from the mentioned rocks and hence have constituted veins of Magnesite and Hontite close to the joints and ground surface and the trend of the structures and tectonic elements of the area has controlled their distribution so that due to cooling of the solutions at points adjacent to the ground surface, the mineralogy alterations are more stiffened in deeper depths. Keywords: Ashin, mineralization, Ophiolite, Central Iran, fractures system
    Advances in Environmental Biology 01/2014; 8(1):175-184.
  • Advances in Environmental Biology 12/2013;
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    ABSTRACT: This paper aimed at investigating the possibility of alkali activated blast-furnace slag (BFS) to produce cement powder that could be alternative to ordinary Portland cement. It was found that an alkali activated BFS cement with 90% of BFS free clinker showed a trend similar to OPC sample, respectively. The concrete based on activated BFS are of lower environmental impact and have great potential for engineering applications.
    Advances in Environmental Biology 12/2013;
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    ABSTRACT: Rain fed agriculture is a common practice in most tropical regions. With a huge potential which unfortunately remains underexploited, Africa is constantly faced with the problems of self-sufficiency. Rice became especially since 1990 one of the most important food crops in Africa. Since colonial times, many governments of least developed countries have adopted policies to promote the introduction of rice as a staple food for urban populations growing. Considering harvested area, rice is the fifth most important cereal in Africa and the fourth in terms of production. In Africa, rice production is increasing at the highest rate of any cereal. The inherent problems in upland rice production are mostly due to climatic change conditions prevailing in ecological production areas, declining soil fertility, low availability of land and many other factors. In this context, lowland agriculture production is the best and offer potential in rain fed agriculture which can be practice with less difficulty and risk, because water is more available. However, farmers are facing to important phytosanitary problems and one of the most important is the angiosperm parasite rice: Rhamphicarpa fistulosa (Hochst.) Benth. Rhamphicarpa fistulosa is a parasitic weed of Orobanchaceae family. Six species of Rhamphicarpa genus were mainly native to Africa, India and Australia. Two species are native to southern Africa. On those two species, we have Rhamphicarpa fistulosa and Rhamphicarpa bredivepedicillata. Rhamphicarpa fistulosa, a facultative parasite, can cause yield losses ranging from 40% to 100%. Little information is available on the parasite and its host interaction. Rhamphicarpa fistulosa connect its xylem system to the host plant through haustorium. Parenchyma cells building were towards differentiated with cells provided by the periphery of the haustorium. According to certain scientist, a non-polysaccharide material staining dark red with saframin has been founded for different scrophulariaceae. The interface between Rhamphicarpa fistulosa and the roots of its hosts never showed a secretion even if on semithin sections, a darkly staining could be observed. Little control option is also available in the management of this pest. . Keys words: Rhamphicarpa, fistulosa, lowland, rice, review.
    Advances in Environmental Biology 12/2013; 7(14):4567-4572.

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