2024-03-29T12:51:45Z
https://egyjs.journals.ekb.eg/?_action=export&rf=summon&issue=17367
Egyptian Journal of Phycology
1110-8649
1110-8649
2004
5
1
CALCIUM COUNTERACTS THE INHIBITORY EFFECT INDUCED BY SALINITY IN ANABAENA SUBCYLINDRICA AND NOSTOC LINCKIA.
Amal
El-Naggar
Mohamed
Osman
Mostafa
El-Sheekh
Maha
Makled
Growth and some metabolic activities of two cyanobacterial species (Anabaena subcylindrica and Nostoc Linckia) grown under salinity stress with and without exogeneously added calcium chloride were monitored. Salinity treatment (0.3M NaCl) induced pronounced reduction in growth, pigment fractions, carbohydrates, O2–evolution, respiration, lipids content and increase in the measured elements content (Na+, K+, Mg++, Fe+++ and Ca++). Presence of Ca2+ (0.03 or 0.05 M CaCl2) caused significant recovery of the different measured growth parameters and metabolic activities. The most important changes induced by salinity treatment are:1-Reduction in the polysaccharides content of both organisms accompanied with an increase in the soluble sugars, which proposed that the possible inhibitory effect of salinity associated with osmotic regulation. This effect could be ameliorated by addition of calcium ions. 2- The integrity of the plasma membranes impaired by salinity. Presence of calcium protects the membranes against the injury induced by salinity.
salinity
CaCl2
Cyanobacteria
Growth
Photosynthesis
2004
12
28
1
18
https://egyjs.journals.ekb.eg/article_113978_2a42ba5436ffca5b1953fe306f175060.pdf
Egyptian Journal of Phycology
1110-8649
1110-8649
2004
5
1
PHYCOLOGICAL ASSESSMENT OF WATER QUALITY OF RIVER NILE DELTA - EGYPT
Sami
Dessouki
Mohamed
Deyab
Jelan
Mofeed
The number, biomass and diversity of phytoplankton as well as physico- chemical characteristics of surface water at the three sites (El- Rahawi, El - Serw and El -Ziaat) representing Delta region of the river Nile were studied in response to discharged liquid wastes from April, 1998 to April, 1999. A total of 214 algal taxa belonging to 99 different genera were identified. Chlorophyta (81 genera), Bacillariophyta (71 genera), Cyanophyta (28 genera) and Euglenophyta (24 genera) were the dominant group. The minimum phytoplankton growth was in drainage canal of El-Ziaat factory. Moreover, the lower values of diversity and saprobity indicated at drain water concomitant with the higher values of saprobic quotient (SQ) might reflect the pollution status of water. The physico-chemical assessment of water could point to indicate that the upstream and down-stream water is mesotrophic while, water of the mixed station is eutrophic and at drain station was varied between eutrophic to hypereutrophic conditions. Moreover, the low pH values at discharged waste of Soda factory at El-Ziaat and the undetectable dissolved oxygen at El -Rahawi drain were considerably retracted at the mixed and more at down-stream water.
2004
12
28
19
34
https://egyjs.journals.ekb.eg/article_113980_10a73320c7a1765ff14e991a1e3e9c88.pdf
Egyptian Journal of Phycology
1110-8649
1110-8649
2004
5
1
STUDIES ON FATTY ACIDS AND STEROLS CONTENT OF SOME CHLOROPHYCEAN MEMBERS.
Mervat
El-Sherif
Sami
Shaalan
Nagwa
Mohammady
In this work some major marine green algal taxa and the fresh water Chara species were selected and subjected to sterols and fatty acid analyses. Fatty acid analyses indicated that most of the extracted acid fractions were of the polyunsaturated ones (C16, C18 and C20) with some unusual fractions of C17 and C19. Fatty acids as a taxonomic tool gave a particular picture for each investigated taxa that characterized each member. High similarity matrices were observed between Dunaliella salina, Chlorella salina and Enteromorpha compressa. Sterol data indicated that most of the tested algae contained Δ5, Δ5,22, Δ7sterols, peptosterol and the saturated nucleus campestanol. Sterol analyses showed clear variations between genera of the different orders: spinasterol was detected only in Ulvales while 5 β cholestanol and 5 β cholest-7-en- β -ol in Chlorococcales and 5, 22, 24 cholestatrien -3 β -ol was detected only in Charales. In general view, data of sterols and fatty acids indicated that Chara species could be placed among green algae.
2004
12
28
35
50
https://egyjs.journals.ekb.eg/article_113985_23d6a7f54c19c7a00877a9b26267d9c8.pdf
Egyptian Journal of Phycology
1110-8649
1110-8649
2004
5
1
ALGAL FLORA OF RICE FIELDS AT EL-KHARGA OASIS, EGYPT
Mohamed
El-Naghy
Ahmed
El-Shahed
Adel
Fathi
Gamal El Din
Ahmed
Algal flora as well as the physicochemical characteristics of rice fields at El-Kharga Oasis was investigated. A total of 99 taxa were identified of which, 23 were Cyanophytes that belong to 11 genera; 19 Chlorophytes belonging to four genera; 52 Bacillariophytes belonging to 15 genera and five Euglenophytes belonging to three genera. Community structure differed among the studied sites diatoms being the most dominant. Taxa that attained high percent of frequency of occurrence (more than 66.6% i.e. being recorded four times during the study period) include; the blue green algae Osdcillatoria chlabea, O. mougeotii, O. principes, O. raoi, O. simplissima; the green algae Cosmarium lavae var. Lavae, C. pseudopyramidatum and the diatoms Anomoeoneis sphaerophora and Nitzschia thermalis. Taxonomic description for the rarely recorded taxa to the algal flora of rice fields is given. The paper also includes illustrations of 78 recorded algal taxa presented in 6 plates.
Aquatic algal flora
Rice fields
El-kharga Oasis
Egypt
2004
12
28
51
69
https://egyjs.journals.ekb.eg/article_113986_40eaa831b43c63ddebfc1209e2ed5c46.pdf
Egyptian Journal of Phycology
1110-8649
1110-8649
2004
5
1
IDENTIFICATION OF VOLATILE ORGANIC COMPOUNDS PRODUCED BY ALGAE
Gamila
Ali
The volatile organic compounds (VOCS) produced by 12 algal species belonging to different algal groups were identified. The studied species were grown for two weeks and included: Oscillatoria agardhii (two isolates), Oscillatoria limnetica, Oscillatoria limosa, Microcystis aeruginosa, Chroococcus limneticus, Spirulina platensis, Anabaena sphaerica, Nostochopsis wichmannii (blue-green algae), Cosmarium lavae, Ankistrodesmis acicularis (green algae) and Nitzschia linearis (diatoms). Retention indices and mass spectral data were used to identify about 100 components analyzed by GC-MS. The major abundant VOCS detected are cyclohexane, heptane, cyclopentane, dodecane, tridecane, octadecanoic acid, 9-octadecanoic acid and undecanoic acid. Fatty acids and benzene derivatives were the most compounds identified in all algal species. Most of volatile organic sulfur compounds were detected in the blue-green species. Consequently, the two isolates of O. agardhii emphasize the role of nitrate concentration contained in the algal media in the production of both geosmin and 2-methylisoborneol.
Algal bloom
Cyanobacteria
diatoms
GC-MS
Geosmin
green algae
Organic compound
phytoplankton
2004
12
28
71
81
https://egyjs.journals.ekb.eg/article_113988_87e91c82625114d17d283b127917df08.pdf
Egyptian Journal of Phycology
1110-8649
1110-8649
2004
5
1
TOXIC EFFECT OF COPPER ON GROWTH, PIGMENTS, PROTEINS AND SOME ENZYMES OF NITROGEN ASSIMILATION IN THE DIAZOTROPHIC CYANOBACTERIUM ANABAENA VARIABILIS
Amal
El-Naggar
The influence of Cu2+ toxicity on dry mass, chl.a, carotenoids, protein content, Cu2+ uptake, activities of some enzymes of nitrogen assimilation and alkaline phosphatase in the diazotrophic cyanobacterium Anabaena variabilis was evaluated.Lower Cu2+concentrations stimulated the dry weight, chl.a, and protein content, whereas, higher concentrations were inhibitory. In contrast, a prominent increase in the carotenoids content was detected in response to all Cu2+ treatments. A. variabilis showed high uptake capacity of Cu2+. The accumulation capacity is directly proportional to the external Cu2+ concentrations. A stimulation in the activities of glutamine synthetase (GS), NADH-glutamate synthetase (GOGAT), nitrate reductase (NR), nitrogenase and alkaline phosphatase (AP) in response to low Cu2+ concentrations was noted. However, higher ones inhibited the enzymes activities with different degrees. The enzymes could be arranged according to their tolerance to Cu2+ toxicity in the following order: AP > NR > GOGAT > GS > nitrogenase.
Anabaena variabilis
copper
Glutamine synthetase
Glutamate synthetase
nitrate reductase
Nitrogenase
alkaline phosphatase
2004
12
28
83
95
https://egyjs.journals.ekb.eg/article_113989_9a267de991f75941fdf52b05c00c8605.pdf
Egyptian Journal of Phycology
1110-8649
1110-8649
2004
5
1
PHYSIOLOGICAL IMPACTS OF DICHLOROPHYNYLDIMETHYL UREA ON SOME GREEN ALGAE SPECIES
Abo El-Khair
El-Sayed
Mohamed
El-Fouly
Abd El-Wahab
Abdel-Maguid
Three algae species belonging to Chlorophyta; i.e Chlorella sp < /em>., Scenedesmus sp < /em>. and Haematococcus pluvialis, were incubated under different concentrations of the photosynthetic inhibitor dichlorophynyldimethylurea (DCMU). Algae were treated with 0, 1, 2, 4 and 8x10-5M DCMU added to N8 macronutrient solution containing ammonium acetate instead of potassium nitrate. The measured parameters were optical density, cell count, medium reaction (pH), total chlorophyll, total carotenoids, crude protein and lipids as ether extract. Results showed that DCMU inhibited growth as optical density for both Scenedesmus sp. and Chlorella sp. H. pluvialis exhibited more resistance against all given concentrations. Chlorophyll reached the maximum with lower and moderate levels of DCMU with Scenedesmus sp. and Chlorella sp. As for H. pluvialis, all used concentrations inhibited chlorophyll accumulation. A different manner was observed on carotenoids accumulation, where the decline of chlorophyll was associated with the decomposition of crude protein and rise in carotenoids and lipids content especially with H. pluvialis.
green algae
chlorophyta
DCMU
optical density
cell count
total chlorophyll
carotenoids and biochemical metabolites
2004
12
28
97
105
https://egyjs.journals.ekb.eg/article_113990_56141b26b40503cca10e557225d61aa4.pdf
Egyptian Journal of Phycology
1110-8649
1110-8649
2004
5
1
EFFECTS OF PH ON TOXICITY OF CADMIUM, COBALT AND COPPER TO THE GREEN ALGA SCENEDESMUS BIJUGA
Adel
Fathi
This study was conducted to elucidate the effects of pH on the toxicity of cadmium, cobalt and copper to the green alga Scenedesmus bijuga. The sublethal concentrations of Cd2+, Co2+ and Cu2+ were obtained at 10-6, 10-5, 10-5 M, respectively. A standard initial inoculum of the tested alga was used to inoculate the culture flasks containing Kuhl's medium with different pH values (4, 6, 8, 10 and 12) supplied with the sublethal concentrations of each tested metal. The results revealed that the growth of Scenedesmus bijuga increased with increasing pH. However, the accumulation, the accumulation factor and the amount of free ionic forms of each metal decreased. Generally, it appears that the tested metals exert more toxic effect in acidic than in alkaline pH conditions.
algae
Heavy metals
pH
toxicity
2004
12
28
107
117
https://egyjs.journals.ekb.eg/article_113991_a23de0bb328cc9aea8c0259e751474f1.pdf
Egyptian Journal of Phycology
1110-8649
1110-8649
2004
5
1
EFFECT OF DIFFERENT CHEMICAL COMPOUNDS ON THE GROWTH OF TWO SOIL ALGAL SPECIES NOSTOC HUMIFUSUM AND OSCILLATORIA EARLEI.
Rawheya
Salah El Din
Ahmed
El-Gamel
Fatma
El Habashi
Wessam
El Nemr
The current study was performed on a farm land at El-Khanka District, Kalyoubia Governorate where the land showed symptoms of increase in its salt content. Some of the physical and chemical characteristics of the collected soil samples were determined. Only two halotolerant species of algae were isolated from the soil samples containing lower total soluble salt contents. Purification of algae from bacteria was done then subjected to a series of experiments for determination of the effect of different chemical constituents on their growth. The results showed that the change in salinity (NaCl contents) as well as changing in carbon and nitrogen sources may have a considerable effect on the growth of the two algae species. In addition, also the major biochemical contents of the algal species were affected by the previous changes.
2004
12
28
119
137
https://egyjs.journals.ekb.eg/article_113992_cadb6a5ea495e497aecea36fd340f7db.pdf