Ali Akbar Heydari

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The present study proposes a fuzzy mathematical model of HIV infection consisting of a linear fuzzy differential equations (FDEs) system describing the ambiguous immune cells level and the viral load which are due to the intrinsic fuzziness of the immune system's strength in HIV-infected patients. The immune cells in question are considered CD4+ T-cells and(More)
Hepatitis B virus (HBV) infection is a worldwide public health problem. In this paper, we study the dynamics of hepatitis B virus (HBV) infection which can be controlled by vaccination as well as treatment. Initially we consider constant controls for both vaccination and treatment. In the constant controls case, by determining the basic reproduction number,(More)
BACKGROUND Culture and specific staining (including Zeil-Nelson and fluorescent methods) are standard measures for the diagnosis of tuberculosis (TB). These methods are time-consuming and sometimes have a low level of accuracy. In addition, in some cases obtaining samples for smear and culture involves invasive procedures; while in other cases there is no(More)
The effects of three periods of exposure (12, 24 and 48 h) to different levels of putrescine (0, 0.2, 0.5, 1.0, 2.0 and 5.0 mg l−1), as well as three incubation periods (24, 48 and 72 h) to different levels of cefotaxime and vancomycin (0, 50, 100, 200 and 500 mg l−1) on microspore embryogenesis of rapeseed cv. ‘Hyola 401’ were assessed. Microspore(More)
INTRODUCTION Cutaneous infection is an uncommon presentation of mucormycosis, usually seen after trauma, at the site of surgical drains or after occlusive dressings. The involved area is erythematous and painful, with varying degree of central necrosis. We report the case of chronic coetaneous infection of one year duration and without apparent necrosis in(More)
  • Fereydon Rezazadeh Zavoshti, Amir Babak Sioofy Khoojine, Javad Ashrafi Helan, Belal Hassanzadeh, Ali Akbar Heydari
  • 2012
From January to February 2008, 468 sheep carcasses (335 male and 133 female) in a Khosroshahr (suburb of Tabriz, East Azerbaijan province, Iran) abattoir were randomly selected for inspection. The aim of the study was to estimate the frequency of caseous lymphadenitis (CLA) in sheep and to compare the results of bacterial cultures and histopathology of(More)
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