جستجوی مقالات مرتبط با کلیدواژه "quercus brantii l" در نشریات گروه "زیست شناسی"

In normal physiological conditions, proteins are mostly spherical and water-soluble. In some cases, proteins are converted into structures called fibrils or amyloid plaques that are insoluble and pathogenic. In this study, the effects of hydroalcoholic extracts of Quercus brantii fruit-hull on the formation of hen egg-white lysozyme fibrils as well as the effect of this extract on the elimination of preformed HEWL fibrils have been investigated. For this purpose, lysozyme was incubated in presence and absence of Q. brantii extract at 60 ˚C for 15 days. The effect of extract was evaluated using CR binding assay, CD spectroscopy, THT and ANS fluorescence testing, and FE-SEM microscope.The results showed that Q. brantii extract in all tested ratios has an inhibitory effect on the formation of amyloid fibrils. Also, the extract has an accelerating effect on the defibrillation of amyloid aggregates and the greatest effect of it on defibrillation is observed in the ratio of 0.5: 1 extract to fibril. From the results obtained in this study, it can be concluded that Quercus brantii fruit-hull contains compounds that can be used as agents in the preparation of drugs for the removal of amyloid plaques in the treatment of amyloid-dependent diseases.

Persian squirrel (Sciurus anomalus) is one of index mammals of the Zagros Oak Forests, as for is very poor of the natural forest cover in Markazi Province, therefore existence of trees dominant type of species Quercus Brantii persica in the Forest Reserve Area of shazand is of great importance for the regeneration of this species.The study was using MaxEnt and statistic methods with Seven variables i.e. tree height, diameter at breast height(DBH), cover crown, distance from roads and agricultural land, distance from the nearest tree, the number of trees has holes, and Frying rate of oak trees, and 60 hypothetical of simulated points of squirrel. The results indicate that an area of 6.4 ha, equivalent to 39%, in the forest reserve area of shazand is habitat suitable for the Persian squirrel. The model validity is 0.845 revealing the excellent performance of MaxEnt method. According to, the habitat conditions of available does not exist of the possibility of regeneration of the Persian squirrel in the Forest Reserve Area of shazand now. The number of trees has holes, diameter at breast height, distance from the nearest tree, Frying rate of oak trees, cover crown and are respectively known as the variables with the greatest impact on habitat of Persian squirrel.

Today the recognition of spatial pattern of plant population is very important in administrative planning and ecological studies and without any spatial information and spatial pattern of the distribution of population in societies the implementation of every program will face problems. This study is investigating the spatial pattern of tree and shrub species in Protected Area of Ghalarang in Ilam Province. In this research, an area with 1200 ha of protected area from Ghalarang is selected and then, 30 plots in a grid of 150 * 100 meters of inventory network are evaluated via systematic random sampling. To evaluate the spatial pattern distribution of species of tree and shrub including Quercus brantii Lindl., Pistacia atlantica Desf., Acer monspassulanum L. and Crataegus azarolus L., variance ratio to mean, Morisita, Morisitas’ Standard Index are used. Results showed that variance ratio to mean index for all species are clustered distribution patterns, for Morisita and Morisitas’ Standard Indexes are random pattern for Acer monspassulanum L. and Crataegus azarolus L., and for Quercus brantii Lindl. and Pistacia atlantica Desf. are clustered distribution patterns. Due to the high percentage of frequency of Quercus brantii Lindl. and Pistacia atlantica Desf. species are cluster distribution pattern which is acceptable in all indexes, But in the variance to mean ratio index cluster distribution pattern was not acceptable for Acer monspassulanum L. and Crataegus azarolus L. species, because frequency of this species are very low and has a random distribution pattern.

Allergy is among those diseases caused by different substances such as pollen affecting many people worldwide where they are living next to such pollen-distributing plants. Quercus brantii is one of the most common trees growing in different parts of Iran including Ilam. The current study aimed to evaluate the variations of IgE and some cytokines such as IFN-Y and TNF-a in rats exposed to the pollen of this tree. Pollens were collected from different parts of Ilam. The inflorescence, in different developmental stages, were removed, fixed inFAA, stored in 70% ethanol, embedded in paraffin and then sliced by microtome. Staining was carried out with PAS and contrasted with Hematoxylin. Rats included in five groups, optical, dermal, nasal, serological and control group with 5 rats in each group. Pollen essence was extracted and applied for each group and 2hrs, 24hrs and one week after exposure, serum samples were collected while the reactions of each rat for symptoms of allergy were recorded too. ELISA was employed to measure nephlomety analysis was applied for total IgE. Data were analyzed by SPSS using ANOVA, Mean evaluation and Pearson correlation. Microscopic examination demonostrated three colpus pollens of plant caet with 94.30 µm in diameter and there are granoralexine in pollens surface. Wheal and flares was observed by 75mg-L of the pollen subcutaneously eye and nasal allergy symptoms were seen in optical and nasal groups, together with sneezing. Total IgE for the serology group was 16.50. IFN and TNF were also different in case and control groups indicating the variation of these immunological properties due to the pollen of this tree. The pollen of Quercus brantii is allergeric when it is inhaled or is in contact with skin and also even when it is injected.