Showing 3 results for Sonboli
Mitra Arman, Hosein Riyahi, Ali Sonboli,
Volume 3, Issue 2 (Autumn 2013)
Abstract
Present study was aimed to identify thermophilic cyanobacterial of three hot spring included, Hajiabad, Khorgoo and Geno located in central part of Hormozgan province. Sampling was done based on water resource condition physicochemical analysis of the water due to a dramatic effect on species distribution was performed, samples collected at different temperature gradients and were divided into two part, one part was fixed in 4% formaldehyde due to minimize quantitative and qualitative changes in phytoplankton and another were kept in a refrigerator for preparing and isolating pure cultures. Taxonomic determination was carried out by morphological characters such as shape, color and size of the cell, colony, thallus and trichome width and length of them shape, size and color of vegetative cells and …, based on artificial valid keys by prepared semi-permanent slides. Results showed these three hot springs have temperature ranging from 33 to 45°C, high distribution of blue-green algae, occurring in Hajiabad spring because of low temperature, in apposite Khoorgoo spring had lowest species distribution because of unfavorable environmental conditions. In each spring also achieved the highest level of diversity at lower temperatures. The species Jaaginema angustissimum, Jaaginema pseudogeminatum, and Jaaginema metaphyticum in all springs and all temperature gradients were present.
Mitra Arman, Hosein Riyahi, Fatemeh Heidari, Ali Sonboli,
Volume 3, Issue 3 (Winter 2014)
Abstract
Cyanobacteria, the blue green algae are one of the most diverse groups of Gram-negative photosynthetic prokaryotes widely distributed throughout the world. Cyanobacteria are known to produce a wide range of secondary metabolites with various biological actions. The aim of this study was to test extracts from various cyanobacteria isolated from Geno hot spring, Bandar Abbas (Iran) against a diverse range of organisms comprising Gram-positive and Gram-negative bacteria and yeasts to evaluate its antibacterial and antifungal activities. Seven species namely Oscillatoria subbrevis, O. tenuis, O. limentica, O. angusta, O. articulate, Synechocystis aquatilis and Synechoccous cerdorum were selected for the production of antimicrobial agents against five Gram-positive and three Gram-negative bacteria, and two fungi. The results of this study showed that the methanol extracts exhibited high antimicrobial activity against some Gram positive bacteria (Bacillus subtilis and B. pumulis), moderate antibacterial activity against the some Gram negative organisms (Escherichia coli) and moderate antifungal activity against some fungi (S. cerevisiae).
Mitra Arman, Hosein Riyahi, Ali Sonboli,
Volume 4, Issue 4 (Spring 2015)
Abstract
The present study was aimed to identify thermophilic cyanobacterial of Chah-ahmad hot springs located in Hormozgan province. Sampling was done based on water resource condition, Water physicochemical analysis was performed due to their dramatic effects on species distribution. Thermophilic samples collected at different temperature gradients were fixed in 4% formaldehyde to minimize changes in phytoplankton. The taxonomic determination was carried out using artificial keys presented in some valid publications. Semi-permanent slides of each isolate were prepared and morphometric study is done using light microscopy. The vegetative and reproductive characters such as shape, color and size of the cell, colony, thallus and trichomes, shape, size and color of vegetative cells, apical cell shape, presence of sheaths and some other morphological were used in the taxonomic determination. Results showed the highest level of diversity was achieved at lower temperatures. Jaaginema angustissimum, Jaaginema pseudogeminatum and Jaaginema metaphyticum were present in all temperature gradients and well adapted to temperature gradients. CCA analysis was done in order to explore the relationship between the species composition in individual spring and physic-chemical parameters as environmental variables. According to the result indicated species are well separated along some parameter such pH, Do, temperature, Ca, Na, K, No3, Po4, So4.
