In this study, taxonomic relationship of some Iranian species of Alyssum sect. Gamosepalums was explored in terms of anatomical aspects. Transversal sections of peduncle belonging to 8 species of Alyssum sect. Gamosepalum have studied by qualitative and quantitative characters. The vascular bundle type was bicollateral in all species. In sum, anatomical properties were evaluated, and the two series of the section was supported and confirmed on the basis of these properties.
Taxonomic aspects of the genus Alyssum section Gamosepalum in Iran were studied. Based on herbarium and more field investigations in NE Iran 9 Alyssum species (section Gamosepalum) were identified, and seven of these species are reported as new records.
Ferula microcolea (Boiss.) Boiss. is an endemic plant in Iran that some of its habitats have been destroyed in recent decades. Since the bioclimatic variables which determine its potential distribution, are poorly defined, a specific analysis is needed. In this study, the species distribution modelling was used for reaching these goals: (i) identifying the bioclimatic factors that constrain the distribution of this species in Iran, (ii) generating a potential habitat suitability map for F. microcolea using Maxent (iii) determining the high suitable areas where this species could be present (iv) evaluating the final model. In all, 66 records of F. microcolea in Iran were used as the occurrence data. Nineteen bioclimatic variables were obtained from the WorldClim database and collinear variables were removed in a sequential manner with regard to the ecological knowledge of the plant. The maxent parameters were optimised with ENMeval R package. For evaluating the performance of the Maxent model, the Area under curve value (AUC) was calculated. The results showed that the model performance was excellent. Analysis of variable contribution demonstrated that the distribution of this species is most influenced by the Annual Mean Temperature. We revealed that the area about 22,005.5 km2 is highly suitable for F. microcolea that is principally located in Chaharmahal and Bakhtiari province. Although this region is rich in biodiversity, greater focus should be paid to its conservation. Our findings provide a scientific basis for the habitats conservation of this species in Iran.
A complete, up to date checklist of Alyssum species reported from Iran is presented in this review. The distribution of these species was considered in Iran and in the adjacent countries, too. Additional records were obtained from Flora Iranica, Flora of Turkey and other references. In Iran some species (e. g., Alyssum hezarmasjedensis, A. mozaffarianii, A. persicum, A. polycladum, A. stipitatum, A. turgidum) have very restricted distribution. Iran is the second important locality for the following species: A. anatolicum, A. contemptum, A. filiforme, A. iranicum, A. lycaonicum, A. niveum, A. penjwinense. The other Alyssum species are widespread in Iran and in the adjacent countries.
Three dense membranes of types SrCo0.8Fe0.2O3−δ (SCF(82)), La0.6Sr0.4Co0.8Fe0.2O3−δ (LSCF(6482)) and La0.8Sr0.2Co0.6Fe0.4O3−δ (LSCF(8264)) perovskites were prepared by complexation applying a chelating agent, ethylene diamine N,N,N′,N′-tetra-N-acetyl-diamine (EDTNAD). The oxygen permeation flux through the perovskite membranes was measured as a function of temperature
within 1,073–1,223 K as well as the oxygen partial pressure of 0.1–1.0 bar. The oxygen permeation fluxes for the membranes,
SCF(82), LSCF(6482), LSCF(8264) with the thickness of 0.85 mm were observed as 9.2 × 10−7 (mol/cm2 s), 1.7 × 10−7 (mol/cm2 s), and 1.0 × 10−7 (mol/cm2 s) in these cases at 1,153 K. The results indicated the oxygen permeation process was mainly controlled by the oxygen bulk
diffusion through these membranes.