نشریه یافته های نوین در علوم زیستی
سال پنجم شماره 2 (پیاپی 16، تابستان 1397)

To understand the Eco physiological adaptation mechanisms of Fagus orientalis Lipesk to altitude changes, the activities of Peroxidase (POD), Catalase (CAT), and Ascorbate peroxidase (APX) in leaves of Fagus orientalis in different altitudes (A1: 700 m, A2: 1200 m, A3: 1700 m above sea level) Was studied in the forests of Guilan. The sampling of leaves was collected from southern and northern parts of the crown of healthy and mature trees. The results of analysis variance showed that there was a significant difference between and within the population for the activity of catalase and peroxidase enzymes at the probability level of 0.05 and with increasing altitude, the activity of catalase and peroxidase were increased but the activity of Ascorbate peroxidase enzyme was initially increased and its level of activity decreased from the middle altitude with increasing altitude. Also, the results showed that the enzymatic activity of peroxidase and catalase in the northern leaves was more than the southern leaves that collected in crown of the trees.

Strictosidine synthase-like (SSL) is a group of gene families in the Arabidopsis genome, which whose orthologues in other plants are key enzymes in mono-terpenoid indole-alkaloid biosynthesis pathway. The SSL7 is upregulated upon treatments of Arabidopsis plants with signaling molecules such as SA, methyl jasmonate and ethylene. To find the functional role of the gene, a T-DNA-mediated knockout mutant (ssl7) along with the wildt ype were treated with different concentrations of NaCl. The expression level of salt stress genes including P5CS1, NCED3, AAO3 and RD29A at 150 mM NaCl demonstrated that the expression was significantly higher in ssl7 compared with the expression in Col-0. The activities of Catalase (CAT), Ascorbate Peroxidase (APX), Peroxidase (POD) and Superoxide Dismutase (SOD) were measured in different concentrations of NaCl. The results suggested that the enzymes activities were significantly higher in ssl7 compared with wild-type Col-0. In total, the results suggest that SSL7 might have a salicylic acid-dependent negative regulatory role in plant resistance to salt stress.

With the increase of cancer disease and the side-effects of the current treatments, researchers are attempting to find methods with less side-effect. The fern Adiantum capillus-veneris L. has triterpenoid compounds which have anti-tumor characteristics. This study aims to investigate the fatal effect of the extract of this plant on breast cancer (MCF-7) and normal (MRC-5) cell lines using MTT method. A. capillus-veneris specimens were collected from Marzoon Abad Village and were dried at the temperature of 40° C by the use of Soxhlet and Ethanol % 96. Hydroalcoholic extract was produced from the aerial and underground parts of this plant and 3 fractions, i.e., Hexane, Chloroform and Ethyl acetate, were prepared from the extract. The compounds of the plant extract were identified by GC-Mass. The results demonstrate the presence of polyphenolic compounds, terpenoid, fatty acids, wax, alkaloid, N-oxide and fibers, with strong antioxidant effect. The results of the MTT test proved that this extract had a dose-depending fatal effect on the MCF-7 cells and is capable of eradicating the cancer cells. On the other hand, its effect on cancer cells is more than its effect on normal cells. Also, IC50 in both of cell lines induced by the extracts of aerial and underground parts showed a significant difference. The fatal characteristics of the extract are comparable with the cisplatin anti-cancer drug.

In this study, the associations between ISSR markers with some agronomic traits in 22 ispaghula ecotypes were used by stepwise regression analysis. The results of stepwise regression analysis showed a significant association between traits and some of loci markers positions. For some traits was detected more than one informative marker. Totally 90 informative ISSR markers were revealed that due to the associated of some markers in control of several traits, finally, the 48 markers were significantly associated with traits. The UBC816-2, UBC826-2 and UBC826-3 markers showed a significant correlation with grain yield and controlled 53.5% of the phenotypic variation. Among the ISSR primers, special attention should be drawn to primer UBC811 and UBC813-11 marker, because of the highest associated had exist between this primer and this marker with the studied traits. Some of these markers were associated with more than one trait that these traits had very close linkage together or possibly were controlled by pleiotropic effects. These primers have been found useful for improved Ispaghula.

In patients with cerebral ischemia, both during hospitalization and in the community, the prevalence of major depression is evident. Since the depression has a negative impact on recovery, its timely diagnosis and treatment is essential. This study aimed to evaluate the effect of the oral administration of Chevilan extract (Ferulago angulata hydroalcoholic extract; 100, 200 and 400 mg/kg) on brain oxidative stress indices and depression after permanent bilateral common carotid artery occlusion or ischemia/hypoperfusion in male adult rats. A number of 35 rats were divided into a control group, an ischemic group and ischemic groups receiving doses of 100, 200 and 400 mg/kg of Chevilan extracts for 14 days by gavage. To make animal models of permanent cerebral hypo perfusion/ischemia, right common carotid artery was ligatured first and the left one ligatured with an interval of one week. To evaluate depression, immobility in the forced swimming time of each rat was measured and then the rat’s brain tissues were extracted to separate hippocampus and measure malondialdehyde. The results showed that ischemia/hypoperfusion increased brain oxidants such as lipid per oxidation (LPO) and immobility. Also, ischemic rats treated with all three doses of the Chevilan show significant reduction in the concentration of MDA hippocampus and in immobility time at a dose of 100 mg/kg and 200 / 400mg, respectively. Increased swimming time was observed in all three groups of extract recipients. It was found that Chevilan extract with antioxidant effect can reduce the side effects of ischemia such as depression.

Medicinal plants are rich sources of secondary metabolites. Lepidium sativum possess active compounds and secondary metabolites, including polyphenol, anthocyanin, flavonoid compounds, which are of special pharmaceutical and economic importance. Melatonin as bio-stimulator compound has a regulatory role on the amount of secondary metabolites and plant tolerance to environmental stresses. In this study, the effect of exogenous melatonin on secondary metabolites production on Lepidium sativum plants was carried out in a completely randomized design with 5 melatonin treatments (0, 5, 10, 50 and 100 μM) and 3 replications. After applying the treatment, the growth rate and content of the photosynthetic pigments, the leaf water content, as well as the content of flavonoids, anthocyanins and total phenolic compounds were investigated. Seed treatment with melatonin, especially at concentrations of 50 and 100 μM, improved the growth parameters and content of photosynthetic pigments. High levels of melatonin also increased the plant's secondary metabolites, including anthocyanins, carotenoids, and plant phenolic compounds. These effects can confirm the role of melatonin as a growth regulator and its impact on plant growth and resistance.

Abstract. Eurasian Nuthatch (Sitta europaea), with 18 subspecies, has a wide distribution in deciduous forests of Eurasia. The subspecies S.e.persica is a resident bird in the Zagros Mountains, from north-west to south-west of Iran. The aim of this study was to evaluate the taxonomic and phylogenetic relationships of this subspecies to European, Asian, as well as Caucasian clades. For this purpose, 10 individuals of two populations from Zagros forests in Kermansha and Kohgiluyeh and Boyer-Ahmad provinces were captured and blood samples were collected. Furthermore, we used ND2 sequence data (1041 bp) for 136 sequnces from GenBank. were used from Then genetic variations and Genealogical analysis was calculated using complete ND2 gene sequence (1041bp) and TRN+G model, Bayesian trees and maximum likelihood, respectively. Also, median joining algorithm showed the relationships among haplotypes. We found four new haplotypes for the Zagros populations. Our phylogenetic analysis revealed that the genetic distance between Zagros population and Caucasian clade was significantly small, demonstrating Zagros populations are part of the Caucasian clade. FST statistical values, resulted from Analysis of Molecular Variance (AMOVA), represented significant variations in genetic structure among Eurasian Nuthatch populations. Moreover, FCT revealed significant variation among European, Asian, and Caucasian clades. Overall our result suggests that Eurasian Nuthatch populations in Eurasia comprise three phylogenetic species, and likely biological species. Hoewever, the previous nomenclatured subspecies, S.e.caucasian and S.e.persica, can be considered as a common phylogenetic species.

The XIAP protein is a member of apoptosis proteins family. The XIAP protein plays a central role in the inhibition of apoptosis and consists of three Baculoviral IAP Repeat domains. The BIR3 domain binds directly to the N-terminal of caspase-9 and therefore it inhibits apoptosis. N-terminal tetrapeptide region of SMAC protein can bind to BIR3, inhibit it and subsequently induce apoptosis. In this study, fifteen tetrapeptides were docked into the BIR3 domain and then 10 ns molecular dynamics simulations were performed on each of the BIR3-peptide complex obtained from docking. MM/PBSA method was subsequently used to calculate the binding free energy of peptides to BIR3. The results of MM/PBSA method were in good coordination with docking and existing expermental results. The results showed the most potent peptides with the lowest binding free energy for binding to BIR3 included ATPF, AKPW and ARPF peptides. Also, investigation of bonds between these peptides and BIR3 domain in the final structure of complexes showed that Leu 307, Thr 308, Glu 314 and Tyr 324 of the BIR3 domain were essential for binding of peptides. Energy decomposition results for binding these peptides to the BIR3 domain during MD simulation was inconsistent with previous results and approved the roles of the same residues. The higher affinity of these peptides relative to native peptide (AVPI) and comparing them with other peptides revealed that the existence of positive charge in the second position and the existence of the aromatic group in the fourth position led to more binding affinity.

A laboratory research carried out to evaluate the effect of drought stress on germination characteristics in two 'Indian' and 'Isfahanian' populations of Fenugreek. This experiment performed in a factorial experiment based on a completely randomized design with three replicates. Four levels of drought stress applied by using polyethylene glycol 6000. Percentage of germination, germination rate, vigor index, root and shoot length as well as fresh and dry weight were measured after 7 days. The results showed that drought stress caused a significant reduction in both population growth and germination, although the percentage of germination, seedling growth and vigor index in the Isfahanian population was higher than the Indian. With the increase of water stress and the reduction of water potential from -3 Bar to -7 Bar, the percentage of germination, vigor index, root and shoot length as well as fresh and dry weight significantly decreased.

. In this study, morphological variation of three species of Squalius in Iranian basins was studied. For this purpose, 709 specimens were captured from the Caspian Sea, the Urmia Lake, the Namak Lake and the Tigris basin. After anesthetizing in clove oil solution and fixing in 10% neutralized formalin, specimens were transferred to the Isfahan University of Technology Ichthyology Museum (IUT-IM) for further studies. In the laboratory, some 14 meristic characters were counted under a streomicroscope. Also, images were analyzed with ImageJ software and 19 morphometric characteristics were measured. In addition, 13 landmarks were defined and digitized on images taken in tpsDig2 software in order to extract geometric morphometric data. Kolmogorov-Smirnov, Kruskal-Wallis, ANOVA, Duncan test, PCA, CVA and cluster analysis methods were used to analyze the differences among the populations. The results of PCA and CVA meristic and morphometric analyses showed no significant differences among the studied populations. The populations of the species studied were significantly different in 11 meristic and 15 morphometric characteristics. Also, the major differences observed in the results of geometric morphometric analysis were related to the position of the pectoral fin, body and head depth. In general, the studied populations highly overlapped, and we suggest that the populations of genus Squalius should be further studied by molecular methods.

In this paper, the urinary infection, that is a common symptom of the decline of the immune system, is discussed based on the well-known algorithms in machine learning, such as Bayesian networks in both Markov and tree structures. A large scale sampling has been executed to evaluate the performance of Bayesian network algorithm. A number of 4052 samples wereobtained from the database of the Takestan Department of Health, a center affiliated to Qazvin University of Medical Sciences. According to the goals of the study and using the expert opinion of the laboratory and urologist, 15 variables were selected. The database included both urine analysis and culture tests. The results indicated 99.7% accuracy of the diagnosis for the training data, (75% of total data), and 99.8% accuracy of the diagnosis for testing data (25% of total data). Based on the Bayesian network model, the important covariates influencing the Urinary infection have been proved to be the increase of bacteria and the decrease of white blood cells in different age groups. The results of this study can be used in the context of machine learning and intelligent systems for rapid diagnosis of the disease and the treatment of people suspected of suffering from it.