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Showing 2 results for Animal Models

Mahmoud Ebrahimi , Mohammad Karimi , Faranak Dehghani , Amir Biriaei , Nafiseh Farhadian, Shiva Golmohammadzadeh ,
Volume 77, Issue 3 (6-2019)
Abstract

Background: Sesame oil can be used to treat cardiovascular diseases, such as atherosclerosis, by reducing the levels of fibrinogen and factor VII. The aim of this study is to prepare a microemulsion containing sesame oil as a drug nanocarrier for improving the aqueous solubility and therapeutic effects of this vegetable oil on the reduction of the fibrinogen and factor VII levels in animal model.
Methods: This experimental study was performed for microemulsion preparation and animal test at Ferdowsi University of Mashhad and Cardiovascular Research Center of Mashhad University of Medical Sciences, Mashhad, Iran, respectively, from April 2015 to January 2017. To prepare the microemulsion samples, Tween 80 and span 80 were selected as surfactant couple and surfactant ratios of 8:1, 9:1 and 10:1 were determined for construction of pseudo-ternary phase diagrams. The Zealand white rabbits were categorized in three groups: receiver of base diet group, high cholesterol diet and high cholesterol diet plus microemulsion.
Results: The average particle size of the samples was in the range of 16.64±0.1 to 21.16±0.2 nm with a uniform particle size distribution. Zeta potential was in the range of -10.7 to 18.4 mV, refraction index was approximately 1.39. Electrical conductivity coefficient was in the range of 297 to 311 μz and pH of all the samples were approximately 6.42 for all samples. All of the microemulsion samples were physically stable and the prepared sample with 9:1 surfactant ratio was selected to investigate the animal test due to the higher oil percentage in comparison with the other samples that be stable over 6 months. Significant decrease in the levels of fibrinogen and factor VII in the third group of rabbits was observed compared to the other groups.
Conclusion: The results of this study showed the effective performance of nanostructured drug delivery systems in the form of microemulsion to improve the aqueous solubility and therapeutic effects of hydrophobic compounds such as vegetable oils.

Hadi Lotfi, Morteza Izadi, Ehsan Lutfi , Hadi Esmaeili Gouvarchin Ghaleh,
Volume 81, Issue 7 (10-2023)
Abstract

Deliberate or threatening use of viruses, bacteria, toxins, or poisonous substances prepared from living organisms to cause death or disease in humans, animals, and plants is called bioterrorism. These agents can be spread by spraying them in the air, causing infection in animals, transferring this infection to humans, or contaminating water and food sources. Defense measures, such as emergency responses to this type of terrorism, are unfamiliar and unknown. The general state of helplessness caused by the lack of complete preparation and the lack of anti-pollution strategies complicates the issue. The ability and widespread interest of civilian personnel to participate in the development of chemical and biological weapons is directly related to easy access to academic excellence around the world. Another factor is the tempting misuse of freely available electronic data and knowledge about the production of antibiotics, vaccines, and conventional weapons with their various complex details. The use of animals in laboratory research to better understand the mechanisms of disease and treatment and to overcome the limitations of clinical trials has a long history. For many viruses, laboratory diagnostic methods and reagents must be continuously modified to account for genetic variations and variants. Unlike bacterial diseases, many of which can be treated with antimicrobial drugs, there are fewer medical countermeasures to combat viral infections. Many of these pathogens are lethal or cause debilitating diseases in humans, making it ethically inappropriate to test the effectiveness of these countermeasures on human volunteers. Researchers must have a correct understanding of various animal models so that they can make the correct choice, gain a better understanding of the clinical symptoms of viral diseases, and provide possible options for treatment and vaccine development. It should be noted that decision-making when faced with a biological attack should be done away from too much fear, and this requires researchers to have prior knowledge of facing these threats. Despite all these checks and measures taken in advance, the international preparedness against these attacks is weak, which can be attributed to the lack of global plans to deal with the epidemic.


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