Khalaf Ali Fayez Abuamra

استاذ - أستاذ متفرغ

كلية العلوم

العنوان: قسم النبات والميكروبيولوجى -كلية العلوم -جامعة سوهاج



المنشورات و المؤلفات التي تحتوي علي الكلمة المفتاحية: Oxidative stress

2019-06-30 22:46:48 الكلمات المفتاحية outer dense fibers, spermatozoa, iOAT, Oxidative stress, sperm motility,
Outer dense fibers abnormalities in spermatozoa of IOAT patients and their relation to oxidative stress and sperm motility
INTRODUCTION & OBJECTIVES: Human Spermatozoa are characterized by certain features that differentiate them from simple Flagella. One of these features is the presence of outer dense fibers (ODFs). ODFs are nine fibers surrounding Axoneme in the midpiece and extend to variable length through the principal piece. They represent about 30% of the protein portion of human spermatozoa and accordingly they ... إقراء المزيد

2019-04-14 17:25:35 الكلمات المفتاحية bovine granulosa cells, Quercetin, Oxidative stress, miRNAs, Nrf2 signaling pathway,
Endogenous and Exogenous Modulation of Nrf2 Mediated Oxidative Stress Response in Bovine Granulosa Cells: Potential Implication for Ovarian Function
Nrf2 is a redox sensitive transcription factor regulating the expression of antioxidant genes as defense mechanism against various stressors. The aim of this study is to investigate the potential role of noncoding miRNAs as endogenous and quercetin as exogenous regulators of Nrf2 pathway in bovine granulosa cells. For this cultured granulosa cells were used for modulation of miRNAs (miR-28, 153 ... إقراء المزيد

2018-10-31 07:20:42 الكلمات المفتاحية acne vulgaris, Oxidative stress,
oxidative stress indices in patients with acne vulgaris.
Background Acne vulgaris is a common dermatological disease frequently found in late childhood and adolescence. Oxidative stress corresponds to an imbalance between the rate of oxidant production and that of their degradation. Excessive rcactix c oxy gen species (ROS) production may explain, at least in part, the progress or inflammation in the pathogenesis or the disease. Objective "".'"1 assess tissue ... إقراء المزيد

2018-10-27 23:06:47 الكلمات المفتاحية Oxidative stress, acne vulgaris,
Assessment of oxidative stress indices in patients with acne vulgaris.
OBJECTIVE: To assess tissue levels of oxidative stress indices: Malondialdehyde (MDA) as free and antioxidants as superoxide dismutase (SOD) and catalase (CAT) in a group of patients with acne as compared to a control group. Also, to determine the relationship of oxidative stress indices with severity of acne .PATIENTS AND METHODS: Two punch biopsies (3 mm) were taken from the ... إقراء المزيد

2018-09-29 18:36:40 الكلمات المفتاحية ultrastructure, tamoxifen, Oxidative stress, L-carnitine, iOAT,
Efficacy of Tamoxifen and L- carnitine on Sperm Ultrastructure and Seminal Oxidative Stress in patients with idiopathic Oligoasthenoteratozoospermia.
Idiopathic oligoathenoteratozoospermia (iOAT) is a common finding in the evaluation of male infertility. Oxidative stress (OS) may underlie its pathology. Tamoxifen and L-carnitine are used to treat idiopathic male infertility. The aim of this work was to detect the efficacy of tamoxifen and L-carnitine on sperm parameters, sperm ultrastructure and seminal OS in iOAT patients. Sixty patients were recruited for ... إقراء المزيد

Lipid mobilization, insulin resistance and oxidative stress as metabolic adaptation processes in dairy cows during the periparturient period
This study aimed to evaluate several biochemical changes in dairy cows during the periparturient period. It was carried out on 38 multiparous Holstein/Friesian crossbreed dairy cows 3-11 years old. On the basis of clinical examination and assessment of BHBA concentration in blood, cows were classified to 4 groups, control healthy cows include 16 animals, subclinical ketosis include 10 animals, cows ... إقراء المزيد

2018-09-29 23:05:06 الكلمات المفتاحية Leukocytospermia, male infertility, nuclear DNA, Oxidative stress, spermatozoa,
Leukocytospermia is associated with increased   reactive oxygen species production by human spermatozoa.
OBJECTIVE: To investigate the role of increased seminal leukocytes in enhancing reactive oxygen species (ROS) production by human spermatozoa. DESIGN: A prospective study. SETTING: Male infertility clinic. PATIENT(S): Forty-eight infertile men. INTERVENTION(S): Standard semen analysis. Assessment of sperm nuclear DNA damage by sperm chromatin structure assay. Incubation of spermatozoa from nonleukocytospermic samples with blood neutrophils. MAIN OUTCOME MEASURE(S): Spontaneous and ... إقراء المزيد

2018-09-29 20:55:34 الكلمات المفتاحية spermatozoa, Oxidative stress, nuclear DNA, male infertility,
Negative effects of increased sperm DNA damage in relation to seminal oxidative stress in men with idiopathic and male factor infertility
OBJECTIVE: To examine the effects of increased sperm DNA damage in relation to seminal oxidative stress in men with idiopathic and male factor infertility. DESIGN: Prospective study. SETTING: Infertility clinic at a tertiary care academic institution. PATIENT(S): Ninety-two infertile men with normal female partners. Sixteen fertile donors served as the control group. INTERVENTION(S): Standard semen analysis and assessment of levels ... إقراء المزيد

2018-09-29 20:09:32 الكلمات المفتاحية OAT, Sperm, Oxidative stress, Reactive oxygen species,
Oxidative stress and epididymal sperm transport, motility and morphological defects
Objectives: Radical oxidative species (ROS) have an important effect on sperm quality and quantity. Oxidative stress (OS) occurs when production of potentially destructive reactive oxygen species (ROS) exceeds the body’s own natural antioxidant defenses, resulting in cellular damage. OS is a common pathology seen in approximately half of all infertile men. Increased ROS generation and reduced antioxidant capacity is negatively ... إقراء المزيد

2018-10-24 12:33:18 الكلمات المفتاحية salt stress, ;water stress, Oxidative stress, Antioxidant activity,
Improving drought and salinity tolerance in barley by application of salicylic acid and potassium nitrate
Growth and physiological activities of barley (_Hordeum vulgare_ L. cv. Gustoe) grown in soil cultures were evaluated to recognize the ameliorative role of salicylic acid (SA) and KNO3 against the negative effects of salt and water deficit stresses. Barley plants were subjected to three levels of NaCl (50, 100 and 150 mM), three levels of water stress (80%, 70% and ... إقراء المزيد