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Search Results: 1 - 10 of 2280 matches for " Amin Tamadon "
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Intermediary role of kisspeptin in the stimulation of gonadotropin-releasing hormone neurons by estrogen in the preoptic area of sheep brain
Mohammad Reza Jafarzadeh Shirazi,Amin Tamadon
Physiology and Pharmacology , 2010,
Abstract: Introduction: The role of estrogen in the stimulation of gonadotropin-releasing hormone (GnRH) neurons is clear. These neurons do not express estrogen alpha receptors, so other mediator neurons should be present to transmit the positive feedback effect of estrogen to the GnRH neurons. Kisspeptin neurons have an important role in the stimulation of GnRH neurons, so they can be the mediator of the effect of estrogen on GnRH neurons in preoptic area of sheep brain. One of the known effects of estrogen is the stimulation of Fos gene in the brain. The aim of the present study was to determine the intermediary role of kisspeptin in the transmission of estrogen effects to the gonadotropin-releasing hormone neurons in the preoptic area of sheep brain. Methods: Six mature ewes in breeding season were selected and ovariectomised. Three ewes in treatment group were injected with 50 mg estradiol benzoate in 1 ml of sunflower oil and three ewes in control group were injected with saline solution intramuscularly. Immediately after estradiol injections, the hypothalamus of the ewes was removed. The count of kisspeptin neurons, Fos genes, and kisspeptin neurons which colocalized with Fos genes were determined by immunohistochemistry. Results: Estradiol injection increased the colocalization of kisspeptin with Fos gene in the preoptic area of the sheep brain (P=0.01). Results of the present study showed that 86.9 percent of kisspeptin neurons colocalized with Fos gene in the preoptic area (P=0.01). Conclusion: Kisspeptin neurons are important mediators in transmission of positive feedback effect of estrogen into GnRH neurons in the preoptic area of sheep brain.
One-Humped Camels (Camelus dromedaries) Hard Ticks Infestation in Qeshm Island, Iran
Saeed Nazifi,Amin Tamadon,Mohammad-Amin Behzadi,Shahram Haddadi
Veterinary Research Forum , 2011,
Abstract: The economic importance of tick infestation on camels are important as they are important meat and milk producer animals in the less vegetation area of Iran and their health and production are greatly affected by the high tick infestation. In this investigation, tick infestations on camels (Camelus dromedarius) were determined in Qeshm Island, Iran. A total number of 912 adult ticks (472 males and 440 females) were collected and identified. Hyalomma dromedarii was the predominant tick specie and accounted for 61.9% of the adult ticks. Other hard ticks were H. anatolicum excavatum (22 %), H. asiaticum asiaticum (14.2 %), H. marginatum (1.9 %), H. impeltatum (0.4 %) and Ripicephalus bursa (0.4 %). In conclusion, The provision of tick control programs in the Qeshm Island would seem a prerequisite for improving camel meat and milk production.
Coexpression of gonadotropin inhibitory hormone with Agouti-related peptide in the neurons of arcuate nucleus of ewe hypothalamus
Mohammad Reza Jafarzadeh Shirazi,Amin Tamadon,Mohammad Reza Namavar
Physiology and Pharmacology , 2011,
Abstract: Introduction: Gonadotropin inhibitory hormone (GnIH) and Agouti-related peptide (AgRP) are orexigenic peptides expressed in the arcuate nucleus (Arc) of the hypothalamus in the ewe. In addition, effects of GnIH and AgRP on the regulation of gonadotropin releasing hormone secretion have been shown in some mammals. The objective of the present study was to investigate the coexpression of GnIH and AgRP in Arc of the ewe hypothalamus. Methods: Nine ewes were divided into follicular, luteal, and ovariectomised groups (n = 3 each group) and the number of neurons that express GnIH and AgRP and the percentage of coexpression of these two peptides in the Arc of each group was estimated by using immunohistochemistry. Results: In different ovarian conditions of ewes, 19 to 32 percent of GnIH and AgRP neurons were coexpressed in the Arc of the hypothalamus. Conclusion: Results of the present study showed a possible cooperative role of AgRP and GnIH in the Arc of the hypothalamus in regulation of ovarian function in ewe.
Expression of gonadotropin inhibitory hormone in the preoptic area and its relation with phases of estrous cycle of ewe
Mohammad Reza Jafarzadeh Shirazi,Mohammad Reza Namavar,Amin Tamadon
Physiology and Pharmacology , 2011,
Abstract: Introduction: Gonadotropin inhibitory hormone (GnIH) has been known as a key inhibitor of the secretion of gonadotropin releasing hormone (GnRH). Ewe has estrous cycles comprising of follicular and luteal phases. Follicular phase is in turn divided into proestrous and estrous phases. Blood level of LH increases in follicular and decreases in luteal phases. The aim of the present study was to evaluate (1) the presence of GnIH neurons in the ewe preoptic area (POA) and (2) the alterations of GnIH expression during different phases of ewe estrous cycle. Methods: Three fertile three-year-old ewes in each phase (n=9) were selected and the number of GnIH neurons was estimated by using immunohistochemistry method. Results: GnIH neurons were present in the POA during different phases of estrous cycle. The number of GnIH neurons significantly increased in the luteal phase in comparison with the proestrous phase (P=0.001). Conclusion: GnIH expression in the neurons of POA of ewe is increased in the luteal phase compared to the follicular phase. This can inhibit GnRH secretion in POA and reduce LH secretion during the luteal phase.
Radiographic, Hematologic and Biochemical Alterations in Peritoneal Fluid after Intraperitoneal Injection of Barium Sulfate and Gastrografin in Rabbit
Sardar Jafari-Shoorijeh,Abutorab Tabatabai-Naini,Sara Varzandian,Amin Tamadon
Zahedan Journal of Research in Medical Sciences , 2012,
Abstract: Background: Evaluation of contrast-induced changes in the peritoneal area may reveal the effects of their permeation followed by gastrointestinal perforation. This study aims to compare the radiographic changes and hematological and biochemical parameters of peritoneal fluid and blood after intraperitoneal injection of barium sulfate and gastrografin to the rabbit.Materials and Methods: In this clinical trial, 15 healthy male rabbits were randomly divided into 3 groups. Respectively to each group 10 ml/kg barium sulfate 30%, 10 ml/kg gastrografin, and 10 ml/kg saline was intraperitoneally injected. Before injection and 24 hours after injection, blood samples and peritoneal fluid were collected to measure glucose, total protein, WBC count and pH. Lateral and dorsal-ventral radiography was provided 20 min and 24 hours after contrast injection.Results: After injection of barium sulfate, serum glucose decreased, cell count and blood neutrophil percentage increased, glucose and the percentage of peritoneal fluid lymphocytes decreased (p<0.05). The amount of total protein, cell count and peritoneal fluid neutrophil percentage increased (p<0.05). Gastrografin injection only increased peritoneal fluid total protein (p=0.04). Other blood factors and peritoneal fluid showed no significant changes. In radiographies, barium sulfate remained in abdominal area and rapid absorption of gastrografin was observed.Conclusion: The use of gastrografin has fewer side effects than barium sulfate and is recommended in patients suspected with gastrointestinal perforation.
Hematological and Biochemical Alterations due to Over Dosage of Enrofloxacin in Cats
Sardar Jafari Shoorijeh, Amin Tamadon1, 2, Mahjoob Vahedi3 and Mohammad Amin Behzadi4*
Pakistan Veterinary Journal , 2012,
Abstract: Enrofloxacin, an antimicrobial agent used to treat bacterial diseases is well tolerated by cats at recommended dosage (5 mg/kg). To investigate the tolerance of high-dose of the Hipralona Enro-I (5% enrofloxacin solution) in cats, 28 urban cats (11 males and 17 females) between the weight of 1.3 and 2.4 kg were randomly assigned to a control group (n=4) and three treatment groups (n=8). Each treatment groups were injected low-dose enrofloxacin (5 mg/kg, IM), high-dose enrofloxacin (15 mg/kg, IM), and very high-dose enrofloxacin (25 mg/kg, IM) once daily for seven consecutive days. Blood samples were collected from jugular vein before injection of enrofloxacin in the hind limb muscles of cats as self-control, and at 3rd, 7th, 14th, and 21st days after first drug injection. Samples were tested for various hematological and serum biochemical parameters. The systemic tolerance during experiment was investigated via monitoring of behavior and general physical examination. Hematological and serum biochemical parameters were not significantly different between groups. In addition, there was no statistically difference between various sampling days for any treatment group in each parameter. Furthermore, there was no change in the behavior and the general health condition of cats in the control and the three experimental groups. As serum biochemical indications of hepatotoxication and nephrotoxication were not observed. It was concluded that muscular injection of enrofloxacin in doses up to 25 mg/kg (5ED50) for seven consecutive days was tolerated by cats.
Effects of Prepartum Monensin Feeding on Energy Metabolism and Reproductive Performance of Postpartum High-Producing Holstein Dairy Cows
Mahmood Changizi Mohammadi, Abbas Rowshan Ghasrodashti1, Amin Tamadon2,3 and Mohammad Amin Behzadi4*
Pakistan Veterinary Journal , 2012,
Abstract: This study was designed to determine the effects of monensin in preparturient diet on postpartum milk production, energy metabolism, and reproductive performance of Holstein dairy cows. Forty Holstein dairy cows on close-up period were randomly divided into monensin treated (300 mg/day in close-up ration, top dress) and control groups. Body condition score (BCS) was estimated three weeks before and three weeks after calving. Milk production and milk fat percentage were recorded in both groups within 3 weeks postpartum. Blood samples were collected from five randomly selected cows of each group three weeks after calving. Serum concentrations of insulin like growth factor-I (IGF-I), insulin, glucose, and beta-hydroxybutyrate (BHBA) were measured. Calving to the first observed estrus interval and calving to conception interval were compared between two groups. The results of the experiment showed that loss of BCS (P=0.3), increase of milk production (P=0.9), and milk fat percentage (P>0.05) were not significantly different between two groups during the period of study. In addition, mean serum glucose concentration (P=0.001) and serum insulin concentration (P=0.01) in monensin group were significantly higher than control cows in the first week postpartum. Moreover, serum BHBA concentration did not significantly change in monensin group. Serum IGF-I concentration in monensin group was significantly higher than control group in three weeks postpartum (P<0.01). The present study indicated that monensin treatment decreased calving to the first observed estrus interval (P=0.05) and calving to conception interval (P=0.002). In conclusion, supplementing the close-up ration can increase postpartum serum IGF-I concentration and prevent the increase of serum BHBA concentration. These may result in enhancement reproductive performance of high-producing dairy cows.
Effects of Post Insemination Flunixin Meglumine Injection on Corpus Luteum Maintenance, Plasma Progesterone Concentrations and Pregnancy Rate in Heat Stressed Holstein Dairy Cows
Kamran Kaveh,Md. Zuki Abu Bakar,Behrang Ekrami,Hamid Ghasemzadeh-Nava,Parviz Tajik,Mahmood Bolourchi,Amin Tamadon
Journal of Animal and Veterinary Advances , 2012, DOI: 10.3923/javaa.2011.2176.2180
Abstract: Aim of the current study was to evaluate the effect of Flunixin Meglumine (FM) post insemination injection on Corpus Luteum (CL) function, its Progesterone (P4) secretion and pregnancy rate of dairy cows in heat stress condition. Estrus cycles of 120 Holstein cows were synchronized utilizing ovsynch protocol and cows were artificially inseminated. Environmental data indicated that the cows experienced medium heat stress during trials (mean daily temperature-humidity index = 79-84). They were randomly divided into three equal groups of 40. Two groups received FM injection between days 2-5 and 10-13 post inseminations once daily and the third group was selected as control. Blood samples were collected on days 7 and 14 post insemination for analysis of plasma P4 concentrations. Ultrasonography scanning was performed on these days for CL detection following which its volume was calculated. The pregnancy status of the cows was estimated at days 27-30 by ultrasonography and confirmed on day 42 by palpation per rectum. Plasma P4 concentrations showed no significant difference in groups receiving treatment compared by the control (p>0.05). However, CL volume was different between the treated groups on day 14 (p = 0.03). The pregnancy rate in group FM 10-13 (20%) was higher than that of group FM 2-5 (17.5%) and control (15%) but this improvement was not statistically significant (p>0.05). Treatment of heat stressed dairy cows with FM post insemination between days 2-5 or 10-13 led to CL maintenance but this treatment could neither increase the serum P4 concentrations nor improve the pregnancy rate.
Geothermal Water in Lebanon: An Alternative Energy Source  [PDF]
Amin Shaban
Low Carbon Economy (LCE) , 2010, DOI: 10.4236/lce.2010.11003
Abstract: Recently, demand for energy has been increased worldwide, notably in the view of high economic value and competi-tion of fossil fuel, as well as the negative impact of fuel consumption through carbon release, and thus the consequences on human health and environment. Various aspects of energy sources into Earth’s crust have been discovered and utilized. Geothermal energy is one aspect of these sources where they have been well pronounced in many countries and proved to be a potential energy source for the future needs. Lebanon, the country with rare natural energy, the renewable energy sources are almost ignored and there is only limited utilization of hydro-power, wind and solar energy, whilst oil imports occupy a substantial portion for energy use. Yet, geothermal energy has not raised and no concern has been given to this renewable source. Meanwhile, there are several indicators showing the existence of geothermal water in different regions in Lebanon. They almost occur where basalt rocks are exposed. This was evidenced whether from water in drilled wells or from various discharging springs, as well as indications of thermal water was observed also in many localities along the Lebanese coastal water. This study shows the available information in this respect, considering the occurrence of geothermal water in Lebanon as an alternative energy source. Thus four major geothermal domains were recognized. The study introduces detailed characterization on the existing aspects of geothermal water and inducing its hydrologic regime and mechanism of groundwater heating. It would be a reconnaissance stage that may help applying further detailed assessment.
Preferential Trade Agreements and the Law and Politics of GATT Article XXIV  [PDF]
Amin Alavi
Beijing Law Review (BLR) , 2010, DOI: 10.4236/blr.2010.11002
Abstract: The tasks Preferential Trade Agreements (PTAs) perform are expressed in their scope and covered issues, thus in order to be WTO compatible these aspects of PTAs should comply with the relevant WTO rules. This paper examines which aspects of PTAs can violate these rules and therefore can be challenged before the WTO Dispute Settlement Body, who may initiate such cases and why there hasn´t been more cases dealing with this important issue.
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