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Articles by T. Lograda
Total Records ( 4 ) for T. Lograda
  M. Ramdani , O. Rached , T. Lograda and A. Aggoun
  Genetic variation in monoterpenes foliage was determined in natural populations of Cupressus dupreziana A. Camus. Samples were obtained from 12 populations in 12 regions from Tassili n’Ajjer (Central Sahara of Algeria). A total 20 monoterpenes were detected, with a particular abundance of α-pinene and Δ3-carene. Terpenoids markers allowed the detection of individual chemotypic variability. The high variability found in the monoterpene composition suggested that genetic basis was not the main factor contributing to the extinction of this species. It seems most probable that the reduced population size of this species is related to the effect of Tassili n’Ajjer desertification.
  M. Ramdani and T. Lograda
  Cupressus dupreziana A. Camus (Cupressaceae) is an endemic species in the Tassili n`Ajjer (Algerian Central Sahara). Terpenoid analysis were carried out on 160 trees of 12 natural populations with a view to determining the intra-specific variability. Eighteen sesquiterpenes were detected, including germacrene-D, which was found to be particularly abundant. The terpenoid markers used made it possible to determine the individual patterns of chemotypic variability. The variability of the sesquiterpene composition confirms that genetic factors were not responsible for the decrease in the numbers of this species. The main reason for this decrease is probably the desertification of the Tassili n`Ajjer.
  T. Lograda , A.N. Chaker , P. Chalard , M. Ramdani , J.C. Chalchat , H. Silini and G. Figueredo
  The hydrodistilled oils from the aerial parts of Genista numidica and G. saharae, which are endemic to Algeria, were analyzed by Gas Chromatography-Mass Spectrometry (GC-MS). Sixty nine compounds in the oil of G. numidica representing 87% of the total oil and 58 compounds of G. saharae, representing 91% of the total oil were identified. The analysis showed that the main constituents of the essential oils are rich in fatty acid. The major constituent are lauric acid (9.1-8.4%), myristic acid (13.5-14.5%), palmitic acid (15.3-32.3%) and linoleic acid (0-2.4%). The effects of these oils on the growth of Escherichia coli (ATCC 25922), Pseudomonas aeruginosa (ATCC 27853) and Staphylococcus aureus (ATCC 25923) were investigated by the diffusion method. The oils showed no significant antibacterial activities.
  A. Zeraib , M. Ramdani , T. Lograda , P. Chalard and Gilles Figueredo
  The essential oils of the aerial parts of two populations of Moricandia arvensis in the Setif region (Algeria) were analyzed by gas chromatography and mass spectrometry (GC-MS). Thirty compounds were identified from the oils of M. arvensis, representing 80.8% of the total essential oil of southern population and 19 compounds of the population north of Setif, representing 93% of total oil. The analysis showed that the essential oils are rich in fatty acid (34.1-22.1%). The major constituent are palmitic acid (13.2-12.9%) and the phytol (7.9-10.5%). The Setif population is characterized by 3-butenylisothiocyanate and Octadecanoic acid, 2-hydroxy-1,3-p. The effects of these oils on the growth of Escherichia coli (ATCC 25922), Pseudomonas aeruginosa (ATCC 27853) and Staphylococcus aureus (ATCC 25923) were investigated by the diffusion method. The oils showed no significant antibacterial activity.
 
 
 
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