Ecological Assessment for Trace Metal Pollution in a Freshwater Ecosystem
Ezeonyejiaku Chigozie Damian,
Okoye Charles Obinwanne,
Ezenwelu Chijioke Obinna
Issue:
Volume 4, Issue 3, September 2019
Pages:
58-65
Received:
25 June 2019
Accepted:
19 July 2019
Published:
6 August 2019
Abstract: Heavy metals in the aquatic environment is of great ecological importance; hence, the study was carried out to evaluate the presence and effects of heavy metals on the water column, fish and sediment composition of Anambra River in July, 2011 and February, 2012 which covered both wet and dry season. The results of the physico- chemical properties showed significant variations (P<0.05) which occurred in DO and conductivity over the sampling seasons on different locations. pH, temperature and salinity showed seasonal difference at P<0.05 in different locations studied. There was no seasonal difference at P>0.05 among the heavy metal concentrations detected in sediment. Post Hoc test also showed no statistical variation (P>0.05) over the five locations: namely Enugu Otu, Ezi - Agulu Otu, Otuocha, Otu Nsugbe and Ukwuibili. There was stable relative non-statistical variations among the heavy metal concentration in the water column but numerical differences demonstrated variability (Otu-Nsugbe > Ezi Agulu Otu > Ukwuibili > Enugu Otu > Otuocha. For the fish species caught both in the rainy and dry season, Clarias gariepinus and Mugil cephalus showed higher (P <0.05) concentrations of Zn in dry than rainy season, while Heterotis niloticus showed higher (P<0.05) concentrations of Zn in rainy than dry season. The highest concentrations of heavy metals were detected in the sediment followed by the fish and finally the water column in a decreasing order of concentrations.
Abstract: Heavy metals in the aquatic environment is of great ecological importance; hence, the study was carried out to evaluate the presence and effects of heavy metals on the water column, fish and sediment composition of Anambra River in July, 2011 and February, 2012 which covered both wet and dry season. The results of the physico- chemical properties s...
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Impacts of Discharge of Desalination Plants on Marine Environment at the Southern Part of the Egyptian Red Sea Coast (Case Study)
Hussein Nasr,
Mohsen Yousef,
Hashem Madkour
Issue:
Volume 4, Issue 3, September 2019
Pages:
66-70
Received:
19 August 2019
Accepted:
6 September 2019
Published:
24 September 2019
Abstract: There are many researches illustrated that almost lots mankind is suffering from shortage fresh water supply, both of quality and quantity. Considering water inadequate concerns approximately 80 countries and has caused some dangerous results in many places. The water shortage phenomenon is becoming a serious worldwide problem that impacts people’s daily life and obstacle the social development. Because of the population increasing and expansion of industrial and agricultural activities, the governments of many countries get one’s way to implement the desalination plants. A desalination plants is an industrial system that would have the potential to have an effect on environmental ecosystem. This study monitored variety of environmental impacts can be caused by desalination plants. It’s considers a case study for two of the desalination plants located at Shalateen city at Red sea governorate namely; Marsa Humira and Shalateen desalination plants. The investigation unconcealed that there are distinct impacts of the reject water on the marine ecosystem in the front of the two studied stations. The photographs that has been taken to the biota exist in the marine area around the stations elucidated some of coral reefs affected by the discharge of the saline reject around. Coral reef and sea grass are the most biota affected due to the salty discharges that exceed the safe limits for those to be in a healthy condition.
Abstract: There are many researches illustrated that almost lots mankind is suffering from shortage fresh water supply, both of quality and quantity. Considering water inadequate concerns approximately 80 countries and has caused some dangerous results in many places. The water shortage phenomenon is becoming a serious worldwide problem that impacts people’s...
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Isolation and Molecular Identification of Yeasts in Different Food Stuff and Determine Their Abilities for Phenols and Flavonoids Productivity by HPLC Analysis
Eman Mostafa Mohamed,
Maysa Ahmed,
Somaya Nassar
Issue:
Volume 4, Issue 3, September 2019
Pages:
71-79
Received:
28 August 2019
Accepted:
23 September 2019
Published:
9 October 2019
Abstract: This investigation was isolated forty-three spoilage yeasts from twelve different spoilage food sources included (guava, tomato, strawberry, pickled carrot, orange juice, grape, date, cheese, potato, okra, onion and dough) by used three kinds of media (PDA, MYEA and MEA) and three isolation techniques (touch, direct and dilution plate methods). The result recorded that the guava represent the richest sources with 15 yeasts isolated. The MYEA medium represented the most suitable medium for isolation of yeast from these sources and recorded 35 yeasts isolates, and also the result show that 28 yeasts isolates were isolated by direct plate method which represented the most suitable techniques for yeast isolation from the previous sources. The isolated yeast was classified according to their colony colors into four categories includes white, off-white, creamy and red colors. The total numbers of isolated yeast and its kinds are affected by the source, techniques, and media used in isolations. The ability of all isolated yeasts was screened for phenol and flavonoid productivity. The highest productive phenol and flavonoid yeasts were selected for identifying by molecular techniques, performed by phenotypic characteristics and ITS region. Also, those highest phenols and flavonoid producers strains were confirmed their productivity by using HPLC analysis.
Abstract: This investigation was isolated forty-three spoilage yeasts from twelve different spoilage food sources included (guava, tomato, strawberry, pickled carrot, orange juice, grape, date, cheese, potato, okra, onion and dough) by used three kinds of media (PDA, MYEA and MEA) and three isolation techniques (touch, direct and dilution plate methods). The...
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