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Fattahi, Mohammad,Sharif, Farnaz,Geiller, Tristan,Royer, Sé,bastien Society for Neuroscience 2018 The Journal of neuroscience Vol.38 No.30
<P>Spatial location in the environment can be defined in relation to specific landmarks or in relation to the global context, and is estimated from both the sensing of landmarks and the inner sense of cumulated locomotion referred to as path-integration. The respective contribution of landmark and path-integration to place-cell activity in the hippocampus is still unclear and complicated by the fact that the two mechanisms usually overlap. To bias spatial mechanisms toward landmark or path-integration, we use a treadmill equipped with a long belt on which male mice run sequentially through a zone enriched and a zone impoverished in visual-tactile cues. We show that inactivation of the medial septum (MS), which is known to disrupt the periodic activity of grid cells, impairs mice ability to anticipate the delivery of a reward in the cue-impoverished zone and transiently alter the spatial configuration of place fields in the cue-impoverished zone selectively: following MS inactivation, place fields in the cue-impoverished zone progressively shift backward and stabilize near the cues, resulting in the contraction of the spatial representation around cues; following MS recovery, the initial spatial representation is progressively restored. Furthermore, we found that place fields in the cue-rich and cue-impoverished zones are preferentially generated by cells from the deep and superficial sublayers of CA1, respectively. These findings demonstrate with mechanistic insights the contribution of MS to the spread of spatial representations in cue-impoverished zones, and indicate a segregation of landmark-based and path-integration-assisted spatial mechanisms into deep and superficial CA1, respectively.</P>
THE REPEATED ENVELOPING SEMIGROUP COMPACTIFICATIONS
FATTAHI, A.,MILNES, P. The Honam Mathematical Society 2002 호남수학학술지 Vol.24 No.1
This note consists of some efficient examples to support the notion of enveloping semigroup compactification and also employ this notion to obtain the universal reductive compactification.
THE REPEATED ENVELOPING SEMIGROUP COMPACTIFICATIONS
FATTAHI, A,MILNES, P 호남수학회 2002 한국수학학술지 Vol.24 No.1
This note consists of some efficient examples to support the notion of enveloping semigroup campactigication and also employ this notion to obtain the universal reductive compactification
Fattahi, Sadegh,Ardekani, Ali Motevalizadeh,Zabihi, Ebrahim,Abedian, Zeinab,Mostafazadeh, Amrollah,Pourbagher, Roghayeh,Akhavan-Niaki, Haleh Asian Pacific Journal of Cancer Prevention 2013 Asian Pacific journal of cancer prevention Vol.14 No.9
Breast cancer is the most prevalent cancer and one of the leading causes of death among women in the world. Plants and herbs may play an important role in complementary or alternative treatment. The aim of this study was to evaluate the antioxidant and anti-proliferative potential of Urtica dioica. The anti oxidant activity of an aqueous extract of Urtica dioica leaf was measured by MTT assay and the FRAP method while its anti-proliferative activity on the human breast cancer cell line (MCF-7) and fibroblasts isolated from foreskin tissue was evaluated using MTT assay. Mechanisms leading to apoptosis were also investigated at the molecular level by measuring the amount of anti and pro-apoptotic proteins and at the cellular level by studying DNA fragmentation and annexin V staining by flow cytometry. The aqueous extract of Urtica dioica showed antioxidant effects with a correlation coefficient of $r^2$=0.997. Dose-dependent and anti-proliferative effects of the extract were observed only on MCF-7 cells after 72 hrs with an $IC_{50}$ value of 2 mg/ml. This anti proliferative activity was associated with an increase of apoptosis as demonstrated by DNA fragmentation, the appearance of apoptotic cells in flow cytometry analysis and an increase of the amount of calpain 1, calpastatin, caspase 3, caspase 9, Bax and Bcl-2, all proteins involved in the apoptotic pathway. This is the first time such in vitro antiproliferative effect of aqueous extract of Urtica dioica leaf has been described for a breast cancer cell line. Our findings warrant further research on Urtica dioica as a potential chemotherapeutic agent for breast cancer.
Fattahi, Hanieh,Schwarz, Alexander,Geng, Xiao Tao,Keiber, Sabine,Kim, Dong Eon,Krausz, Ferenc,Karpowicz, Nicholas Optical Society of America 2014 Optics express Vol.22 No.25
<P>The dynamics of chirped pulse amplification in thin-disk regenerative amplifiers relevant to the pumping of optical parametric chirp pulse amplification systems are described. It is shown that the suitability for reproducible pumping of subsequent nonlinear processes requires a balance between the demands of avoiding chaotic pulse train dynamics and providing a reproducible spectral phase. We describe measures that may be taken to ensure that a laser system operates in the desired stable regime.</P>
Mohammad Fattahi,Vahideh Nazeri,Fatemeh Sefidkon,Zabihollah Zamani,Javier Palazon 한국원예학회 2011 Horticulture, Environment, and Biotechnology Vol.52 No.6
The aim of this study was to investigate the effect of pre-sowing treatments and light on Dracocephalum kotschyi Bioss. seed germination. The following treatments were used: sandpaper; 3, 5 and 10 min soaking in sulfuric acid; 15 min in sodium hypochlorite; 24 h in water, hot water and boiling water; 50, 150, and 250 mg・L^(-1) of Gibberellic acid; 1000, 2000,4000, and 6000 mg・L^(-1) of KNO3, and water (control). The germination rate, germination start (GS), mean germination time (MGT), time to 50% germination (T_(50)) and cumulative germination were determined as germination indices. Root, shoot and seedling length and the vigor index (VI) were evaluated as growth factors at the end of the incubation period. Second experiment was carried out to study the effect of light on seed germination. It was observed that both the physical and chemical scarification methods were effective in enhancing D. Kotschyi seed germination and growth. In the first stage, up to day 20 SA (10 min) and sandpaper scarification treated seed had shown germination more than 70% whereas control seeds did not begin germination until day 20. The highest germination rate was observed with sandpaper (1.77 units) and SA (1.56 units)in compare with other treatments (less than 0.9 units). Also the highest vigor index was found in SA- and sandpaper-treated seeds and the lowest occurred in sodium hypochlorite treatments. The other results showed that light was more effective than darkness for seed germination.
Moslem Fattahi,Mohammad Kazemeini,Farhad Khorasheh,Alimorad Rashidi 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.4
In this research the application of design of experiment (DOE) coupled with the artificial neural networks (ANN) in kinetic study of oxidative dehydrogenation of propane (ODHP) over a vanadium–graphene catalyst at 400–500 ℃ and a method of data collection/fitting for the experiments were presented. The proposed reaction network composed of consecutive and simultaneous reactions with kinetics expressed by simple power law equations involving a total of 20 unknown parameters (10 reaction orders and 5 rate constants each expressed in terms of a pre-exponential factors and activation energies) determined through non-linear regression analysis. Because of the complex nature of the system, neural networks were employed as an efficient and accurate tool to model the behavior of the system. Response surface methodology (RSM) and ANN methods were constructed based upon the DOE’s points and were then utilized for generating extra-simulated data. The three data sets including the original experimental data, those simulated by the ANN and RSM methods were subsequently used to fit power law kinetic rate expressions for the main ODHP and side reactions. The results of kinetic modeling with simulated data sets from the ANN and RSM models compared with collected experimental data. Both methods were able to satisfactorily fit the experimental data for which the ANN data set showed the best fitting amongst them all.
Javad Fattahi,Reza Fotouhi,Davoud Bakhshi,Sirous Aghajanzadeh 한국원예학회 2009 Horticulture, Environment, and Biotechnology Vol.50 No.4
Fruit quality and its appearance are very important from consumer’s view point. The fruits of ‘Moro’, ‘Tarocco’, ‘Sanguinello’, and ‘Sanguine’ blood orange cultivars were harvested at the stage of commercial maturity in Kotra (North) and Darab (South) counties in Iran. After harvesting, the fruits were analyzed for Hunter value, total soluble solids (TSS) content, titratable acidity (TA), and concentrations of anthocyanin and cyanidin 3-glucoside. ‘Tarroco’ fruits from Darab region showed high Hunter L value (70.3). The oranges harvested in Kotra had a hue angel value of more than 80. Chroma values were at the highest amount in ‘Tarocco’ with 70.6 values. Generally, TSS was higher in the cultivars grown in south than north. ‘Sanguinella’ and ‘Sanguine’ fruits had the highest TA in both regions. Cyanidin 3-glucoside contents of ‘Tarocco’ (South) and ‘Moro’ (North) were 368.2 and 196.05 ㎎ㆍL?¹, respectively, which were higher than the others. However, ‘Sanguinello’ and ‘Sanguine’ fruits grown in the southern region contained higher amount of cyanidin 3-glucoside than those in the northern area. In this experiment, we found that climate was the major influence on main component and anthocyanin of fruits. ‘Tarocco’ and ‘Moro’ fruits had high quality in south and north counties, respectively.