2024-03-28T22:05:44Z
https://egyjs.journals.ekb.eg/?_action=export&rf=summon&issue=17487
Egyptian Journal of Phycology
1110-8649
1110-8649
2013
14
1
ADSORPTIVE REMOVAL OF CHROMIUM BY DRIED BROWN ALGA SARGASSUM HORNSCHUCHII
Eman
Fakhry
Suzan
Ismail
Nadia
Noaman
Magda
Shafik
Wafaa
Menesi
Adsorption of hexavalent chromium using dried macro-alga Sargassum hornschuchii was studied under controlled laboratory conditions. Experimental parameters such as contact time, biomass dosage and pH were studied in a metal concentration of 25 mg L-1. The adsorption of chromium was fast at the initial phase of study and gradually with time became slowly. The maximum removal percentage of chromium was statistically significant and it was found to be 99.36% at 36 hrs and pH 3 using 8 g L-1 algal dosage. Five consecutive adsorption / desorption cycles were operated on metal solution using 0.1 M NaOH and 0.1 M HCl. It was found that chromium adsorption decreased following each adsorption / desorption cycle. Results indicated the superiority of HCl for the recovery of chromium from algal biomass. The present investigation shows that the locally biosorbent Sargassum hornschuchii possesses high adsorption performance with regard to the removal of chromium from its aqueous solution.
Adsorption
Chromium
Removal percentage
Sargassum hornschuchii
2013
11
30
1
14
https://egyjs.journals.ekb.eg/article_115202_d19169216a904689c1d70c0b9c315387.pdf
Egyptian Journal of Phycology
1110-8649
1110-8649
2013
14
1
PLANKTON COMMUNITY, WATER QUALITY AND GROWTH PERFORMANCE OF NILE TILAPIA AS AFFECTED BY HUMIC ACID IN AQUACULTURE PONDS
Mohamed
Battah
Aida
Dawah
Ayman
Ammar
Mohamed
Salama
This study was carried out at Wady El-Ryan, Fayoum Governorate, Egypt to evaluate the influence of humic acid on enrichment of plankton community, water quality, growth performance and pond productivity of Nile tilapia. Eight earthen ponds of a total area of two feddan were used. These fish ponds were divided into four treatments; two replicates per each as the first treatment ponds (T1 and T2) were stocked with Nile tilapia fry 14000 fish/Fadden. The second ponds (T3 and T4) were stocked with 28000 fish/Fadden. T2 and T4 treatment ponds received only supplemental feed at a rate of 3% of body weight (bw), while T1 and T3 were treated with humic acid at a rate of 3 Kg/ Feddan during the preparation of the ponds, then they received a supplemental feed adding on it 1.5 Kg of humic acid/ ton feed. Comparison between treatments showed that there were no significant differences (p> 0.05) in water temperature, salinity, total hardness and total alkalinity. Dissolved oxygen, orthophosphate, Chlorophyll "a", concentrations in T1 and T3 ponds were significantly higher (p < 0.05) than those of T2 and T4 ponds. Free ammonia, nitrate and nitrite concentrations in T2 and T4 ponds were significantly higher (p < 0.05) than those of T1 and T3 ponds. Secchi disk reading was significantly higher in T4 ponds than that of the other treatment ponds. Phytoplankton and zooplankton abundances were significantly higher in T1 and T3 ponds than those of T2 and T4. The final weight of Nile tilapia was maximized at T1 ponds, while the lowest one was in T4 ponds.
Humic acid
Nile tilapia
water quality
phytoplankton
Zooplankton
2013
11
30
15
35
https://egyjs.journals.ekb.eg/article_115205_9122df94f153d96ddb2aa63a1b4b0cde.pdf
Egyptian Journal of Phycology
1110-8649
1110-8649
2013
14
1
REMOVAL OF ZINC AND ITS EFFECT ON SOME MACROMOLECULES AND ULTRASTRUCTURE OF PTEROCLADIA CAPILLACEA AND SARGASSUM HORNSCHUCHII
Nadia
Noaman
Suzan
Ahmed
Eman
Fakhry
Magda
Shafik
Wafaa
Menesi
The removal process of zinc from an aqueous solution illustrated a good biosorption of metal by both algal fresh materials. However, the highest removal percentage of zinc by P. capillacea was found to be greater than that by S. hornschuchii. The removal of zinc by P. capillacea and S. hornschuchii increased with increase in contact time up to 3 and 5 hours, respectively. It decreased by very slight rate within 4–12 hours for P. capillacea and within 6–12 hours for S. hornschuchii. This study evaluated the effect of zinc on growth, amino acids, fatty acids and protein contents of Pterocladia capillacea and Sargassum hornschuchii .In this investigation P. capillacea tolerates higher concentrations of heavy metals as compared to S.hornschuchii . Exposure of P. capillacea to zinc decreased all amino acids except tyrosine, phenylalanine and proline which increased. All amino acids of S.hornschuchii increased by exposure to zinc except glycine, alanine, valine, leucine, isoleucine, phenylalanine and methionine, which decreased. The protein content of P. capillacea was inhibited by zinc, while percentage of protein content of S.hornschuchii increased more than three times by exposure to zinc. All fatty acids of P. capillacea increased by exposure to zinc except C16:1, which decreased and C11:0, C 20:0 and C17:1, which disappeared and C18:3 and C20:5, which appeared. Exposure of S.hornschuchii to zinc causes the increase of the contents of all fatty acids except C6:0, C10:0, C18:0 and C18:2, which decreased, C23:0 and C20:3, which appeared. Concerning the ultrastructure of P. capillacea grown in zinc solution for hours, it showed destructive irregularity of cell wall, disordering of cell inclusions, appearance of vacuoles and aggregation of cell components in a dense black manner inside the cell, while examination of S. hornschuchiiultra-structure with zinc showed destructive change in thyllakoids arrangement and slightly deviation of protoplast from the cell wall.
uptake
zinc
algae
amino acid
fatty acid
Ultrastructure
2013
11
30
37
64
https://egyjs.journals.ekb.eg/article_115209_0ffc44b65ece25d9e7c4b3b77120a935.pdf
Egyptian Journal of Phycology
1110-8649
1110-8649
2013
14
1
EFFECT OF ULTRAVIOLET-B IRRADIATION ON FATTY ACIDS, AMINO ACIDS, PROTEIN CONTENTS, ENZYME ACTIVITIES AND ULTRASTRUCTURE OF SOME ALGAE
Nadia
Noaman
Faiza
Akl
Mohamed
Abdel-Kareem
Magda
Shafik
Wafaa
Menesi
A series of experiments were conducted to determinefatty acids, amino acids, protein contents and enzymes activities of the three algae (Ulva lactuca, Sargassum hornschuchii and Pterocladia capillacea), which were previously collected in the late of July 2009 from Abu Qir and subjected to UV-B radiation for 20, 40 & 60 minutes daily for five days. These parameters were estimated, when the UV-absorbing compounds contents recorded its maximum after the third day of irradiation of 60 minutes daily for the three algal species. This time was chosen as we expected a suitable response of the algal species to UV-B irradiation. Total saturated, mono unsaturated and polyunsaturated fatty acids of U. lactuca and S. hornschuchii were increased due to UV-B irradiation, the total fatty acids content in both irradiated algae increased also, while the contents of total saturated, mono and polyunsaturated fatty acids of Pterocladia capillacea decreased after exposure to UV-B radiation. The study shows that half of amino acids of Ulva lactuca increased after exposure to UV-B radiation for three days, while the other half of amino acids was decreased.S. hornschuchii showed the decreasing of all amino acids contents after exposure to UV-B radiation except the two basic amino acids histidine and lysine, and the aliphatic amino acid serine. All amino acids of P. capillacea increased after exposure to UV-B radiation for three days except the aliphatic amino acid serine and the aromatic amino acid tyrosine.The total protein content increased in U. lactuca and S. hornschuchii through out the irradiation experiment, while P. capillacea showed notable decreases of protein contents after UV-B irradiation. Exposure to UV-B radiation increased the activity of superoxide dismutase, ascorbate peroxidase and catalase of the three irradiated algal species. The findings also suggest that exposure to UV-B irradiance also affect the ultrastructure of all the irradiated algal species.
algae
ultraviolet
fatty acids
Amino acids
proteins
Enzyme
Ultrastructure
2013
11
30
67
101
https://egyjs.journals.ekb.eg/article_115212_6b3398754b01d567ea32f6ecd0fecf9c.pdf
Egyptian Journal of Phycology
1110-8649
1110-8649
2013
14
1
HOLOCENE DIATOMS FROM GULF OF SUEZ SEDIMENTS, EGYPT
Ahmed
El-Awamri
Hesham
Abd El Fatah
Marine Holocene fossil diatoms were studied from different locations along the Gulf of Suez. Quantitative and qualitative diatom analyses from the sea floor sediments of the Gulf of Suez at different depths were used to evaluate the paleo-environmental conditions during the Holocene. Sea floor samples were taken from twelve locations at different depths ranging from 15 to 275ft. below sea level. A total of 106 taxa related to 48 genera were identified from 12 sediment samples examined from the north, middle and south of the Gulf of Suez at different depths. Those diatom taxa were used according to their habitat preferences and ecological conditions to predict the water quality fluctuations during the Holocene.
diatoms
phytoplankton
Gulf of Suez
Paleoenvironment
Holocene
Marine diatoms
2013
11
30
103
130
https://egyjs.journals.ekb.eg/article_115214_f9479e144371821bb8251280f52baf42.pdf