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( Mohammad H Farzaei ),( Roodabeh Bahramsoltani ),( Mohammad Abdollahi ),( Roja Rahimi ) 대한소화기기능성질환·운동학회(구 대한소화관운동학회) 2016 Journal of Neurogastroenterology and Motility (JNM Vol.22 No.4
Irritable bowel syndrome (IBS) is the most common disorder referred to gastroenterologists and is characterized by altered bowel habits, abdominal pain, and bloating. Visceral hypersensitivity (VH) is a multifactorial process that may occur within the peripheral or central nervous systems and plays a principal role in the etiology of IBS symptoms. The pharmacological studies on selective drugs based on targeting specific ligands can provide novel therapies for modulation of persistent visceral hyperalgesia. The current paper reviews the cellular and molecular mechanisms underlying therapeutic targeting for providing future drugs to protect or treat visceroperception and pain sensitization in IBS patients. There are a wide range of mediators and receptors participating in visceral pain perception amongst which substances targeting afferent receptors are attractive sources of novel drugs. Novel therapeutic targets for the management of VH include compounds which alter gut-brain pathways and local neuroimmune pathways. Molecular mediators and receptors participating in pain perception and visceroperception include histamine-1 receptors, serotonin (5-hydrodytryptamine) receptors, transient receptor potential vanilloid type I, tachykinins ligands, opioid receptors, voltage-gated channels, tyrosine receptor kinase receptors, protease-activated receptors, adrenergic system ligands, cannabinoid receptors, sex hormones, and glutamate receptors which are discussed in the current review. Moreover, several plant-derived natural compounds with potential to alleviate VH in IBS have been highlighted. VH has an important role in the pathology and severity of complications in IBS. Therefore, managing VH can remarkably modulate the symptoms of IBS. More preclinical and clinical investigations are needed to provide efficacious and targeted medicines for the management of VH.
M. Tahamouli Roudsari,F. Abdollahi,H. Salimi,S. Azizi,A. R. Khosravi 한국강구조학회 2015 International Journal of Steel Structures Vol.15 No.4
Reduced Beam Section (RBS) connections are a new type of connection which have been used in steel moment-resisting frames since the 1994 Northridge earthquake. This study is primarily aimed at analyzing the effects of suitable web stiffeners on preventing the deterioration effect of the hysteresis curve for RBS connections. Results of more than 183 nonlinear finite element analyses on different IPE sections with radius cut, straight cut, and drilled-flange RBS connection showed that different web stiffeners considerably contribute to the enhancement of seismic performance of RBS connections. In this research, the effects of factors such as the geometry and the number of the stiffeners, the distance between the stiffener and column side, and the length and thickness of the stiffener on the seismic performance of RBS connections were also studied.
( Fatemeh Dolatabadi ),( Amir H Abdolghaffari ),( Mohammad H Farzaei ),( Maryam Baeeri ),( Fatemeh S Ziarani ),( Majid Eslami ),( Mohammad Abdollahi ),( Roja Rahimi ) 대한소화기기능성질환·운동학회(구 대한소화관운동학회) 2018 Journal of Neurogastroenterology and Motility (JNM Vol.24 No.3
Background/Aims The aim of present study is to estimate the effects of Melissa officinalis L. (MO) on visceral hypersensitivity (VH), defecation pattern and biochemical factors in 2 experimental models of irritable bowel syndrome (IBS) and the possible role of nitric oxide. Methods Two individual models of IBS were induced in male Wistar-albino rats. In the acetic acid model, the animals were exposed to rectal distension and abdominal withdrawal reflex, and the defecation patterns were determined. In the restraint stress model, the levels of TNF-α, myeloperoxidase, lipid peroxidation, and antioxidant powers were determined in the (removed) colon. Rats had been treated with MO, L-NG-nitroarginine methyl ester (L-NAME), aminoguanidine (AG), MO + AG, or MO + L-NAME in the mentioned experimental models. Results Hypersensitive response to rectal distension and more stool defecation in control rats have been observed in comparison to shams. MO-300 significantly reduced VH and defecation frequency in comparison to controls. VH and defecation pattern did not show significant change in AG + MO and L-NAME + MO groups compared to controls. Also, significant reduction in TNF-α, myeloperoxidase, thiobarbituric acid reactive substances (TBARS), and an increase in antioxidant power in MO-300 group was recorded compared to controls. AG + MO and L-NAME + MO groups showed a reverse pattern compared to MO-300 group. Conclusions MO can ameliorate IBS by modulating VH and defecation patterns. Antioxidant and anti-inflammatory properties along with its effect on the nitrergic pathway seem to play important roles in its pharmacological activity. (J Neurogastroenterol Motil 2018;24:490-501)
Study effects of conventional flotation reagents on bioleaching of zinc sulfide
M. Jafari,S. Chehreh Chelgani,S.Z. Shafaie,H. Abdollahi,E. Hadavandi 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.78 No.-
Althoughflotation and bio-extraction of metals from its products are extensively investigated, there arefew studied which evaluated the effects of reagents on bioleaching process. Both structure andconcentration offlotation reagents are effective factors on microorganism activities. In this study,Kendall’s tau (t) as a statistical method was used to statistically access the effect of typical sulfideflotation surfactants (collectors: potassium amyl-xanthate, potassium isobutyl-xanthate, sodium ethyl-xanthate, potassium isopropyl-xanthate, and Dithiophosphate), and frothers: pine oil and methylisobutyl carbinol) on the bioleaching of Zn sulfides in a mixed culture (Leptospirillum ferrooxidans,Acidithiobacillus ferrooxidans and Acidithiobacillus thiooxidans). To consider both structure andconcentration of these reagents, their molarities were used for the statistical evaluations. The Kendallassessments indicated that by increasing in the molarity of reagents, the pH value (the most effectivefactors of bioleaching) was increased (t: 0.56) while the ORP value (t:0.54), Fe3þFe2þ ratio (t:0.51) andnumbers of oxidizing bacteria (t:0.38) in the solution were decreased. Therefore, as a result of thesemulti-interactions, by increasing the molarity of reagents, Zn recovery was decreased (t:0.45). Theseresults potentially can be used for selection offlotation reagents when bioleaching would be themetallurgical metal extraction method.