PREDATOR-PREY IN PATCHY SPACE WITH DIFFUSION

SHABAN ALB 한국산업응용수학회 2011 Journal of the Korean Society for Industrial and A Vol.15 No.2

In this paper we formulate a predator-prey system in two patches in which the per capita migration rate of each species is influenced only by its own density, i.e. there is no response to the density of the other one. Numerical studies show that at a critical value of the bifurcation parameter the system undergoes a Turing bifurcation, i. e. the stable constant steady state loses its stability and spatially non-constant stationary solutions, a pattern emerge.

Identification of Luteovirus Nucleotide Sequences in Mild Yellow-Edge Diseased Strawberry Plants

Shaban Montasser, Magdy,Al-Awadhi, Husain,Hadidi, Ahmed The Korean Society of Plant Pathology 2002 Plant Pathology Journal Vol.18 No.1

The availability of nucleotide sequences of the coat protein gene of Potato leafroll virus (PLRV) permitted the construction of DNA primers that were utilized for cDNA synthesis. Polymerase chain reaction (PCR) products of a 487 bp. and approximately 500 bp DNA fragments were amplified from nucleic acid extracts of PLRV-infected tissue and strawberry mild yellow-edge (SMYE) diseased strawberry tissue, respectively. The amplified DNA fragments were further differentiated by hybridization analysis with a CDNA probe for the coat protein gene of PLRV and restriction fragment length polymorphism (RFLP) analysis. These results suggest that a luteovirus is associated with the SMYE disease.

FIXED POINT THEOREMS FOR SIX WEAKLY COMPATIBLE MAPPINGS IN D*-METRIC SPACES

Shaban Sedghi,M. S. Khan,Nabiollah Shobcollaie 한국전산응용수학회 2009 Journal of applied mathematics & informatics Vol.27 No.1

In this paper, we give some new definitions of D*-metric spaces and we prove a common fixed point theorem for six mappings under the condition of weakly compatible mappings in complete D*-metric spaces. We get some improved versions of several fixed point theorems in complete D*-metric spaces. In this paper, we give some new definitions of D*-metric spaces and we prove a common fixed point theorem for six mappings under the condition of weakly compatible mappings in complete D*-metric spaces. We get some improved versions of several fixed point theorems in complete D*-metric spaces.

COMMON FIXED POINT OF MAPS IN COMPLETE PARTIAL METRIC SPACES

Shaban Sedghi,Nabiollah Shobkolaei 영남수학회 2013 East Asian mathematical journal Vol.29 No.1

In this paper, we prove some common xed point results for some mappings satisfying generalized contractive condition in complete partial metric space.

TURING INSTABILITY IN A PREDATOR-PREY MODEL IN PATCHY SPACE WITH SELF AND CROSS DIFFUSION

SHABAN ALY 한국산업응용수학회 2013 Journal of the Korean Society for Industrial and A Vol.17 No.2

A spatio-temporal models as systems of ODE which describe two-species Beddington - DeAngelis type predator-prey system living in a habitat of two identical patches linked by migration is investigated. It is assumed in the model that the per capita migration rate of each species is influenced not only by its own but also by the other one’s density, i.e. there is cross diffusion present. We show that a standard (self-diffusion) system may be either stable or unstable, a cross-diffusion response can stabilize an unstable standard system and destabilize a stable standard system. For the diffusively stable model, numerical studies show that at a critical value of the bifurcation parameter the system undergoes a Turing bifurcation and the cross migration response is an important factor that should not be ignored when pattern emerges.

INSTABILITY IN A PREDATOR-PREY MODEL WITH DIFFUSION

SHABAN ALY 한국산업응용수학회 2009 Journal of the Korean Society for Industrial and A Vol.13 No.1

This paper treats the conditions for the existence and stability properties of stationary solutions of a predator-prey interaction with self and cross-diffusion. We show that at a certain critical value a diffusion driven instability occurs, i.e. the stationary solution stays stable with respect to the kinetic system (the system without diffusion) but becomes unstable with respect to the system with diffusion and that Turing instability takes place. We note that the cross-diffusion increase or decrease a Turing space ( the space which the emergence of spatial patterns is holding) compared to the Turing space with self-diffusion, i.e. the cross-diffusion response is an important factor that should not be ignored when pattern emerges.

Poster Session : PS 0380 ; Infectious Disease ; Prevalence of Escherichia Coli O157:H7 Causing Children Diarrhea in Sirte, Libya

( Shaban Ramadan Abdelsalam Bagar ) 대한내과학회 2014 대한내과학회 추계학술대회 Vol.2014 No.1

Background: E. coli O157: H7 is a cause of acute infectious diarrhoea in humans and the leading cause of haemolytic uremic syndrome, especiallyamong children. E. coli O157:H7 was known as Verotoxin producing E. Coli (VTEC).It is also called as Shiga toxin producing E. coli(STEC). More than 50 serotypes of EHEC have been isolated. We undertook a study to Estimate the incidence of Escherichia coli O157:H7 infection in diarrheic children attending Ibn Sinna Hospital, Sirte - Libya Methods: 124 stool specimens of diarrheic children were collected at paediatric department in Ibn Sinna teaching hospital in the periodfrom September 2009 to may 2010. All the samples were cultured on SMAC.Non sorbitol - fermenting colonies are tested for the somatic O157 antigen before being confi rmed as E. Coli O157.The colonies are gram stained and confi rmed with O157 antiserum or latex reagent. These colonies were later biochemically confi rmed as E. coli using API20E and reported as presumptively positive for E. coli O157:H7. Results: 124 stool samples which were obtained from 124 diarrheic children contained 127 bacterial isolates belonging to 6 different genera or strains, as detected on SMAC plates Only 4 isolates were non-sorbitol fermenting colonies on SMAC agar. These sorbitol-negatives isolates were later identifi ed serologically and biochemically as: E. COLI O157:H7, one isolate; Shigella sonnei, one isolate; Enterobcater sp, two isolates; 123 isolates fermented sorbitol on SMAC agar, and later identifi ed serologically and biochemically as:Pseudomonas sp. Conclusions: Among 124 stool specimens, only 1(0.7%) was positive for E.coli O157:H7 Magnitude of the problem due to E. coli O157:H7 appears to be not much at Sirte but, because of its ability to cause complication, E. coli O157:H7 should be screened in routine culture and identifi ed. Out of 124 diarrhea samples tested, only four cases (3.2%).

Distribution of Glutathione S-Transferase Omega Gene Polymorphism with Different Stages of HBV Infection Including Hepatocellular Carcinoma in the Egyptian Population

Shaban, Nadia Z,Salem, Halima H,Elsadany, Mohamed A,Ali, Bahy A,Hassona, Ehab M,Mogahed, Fayed AK Asian Pacific Journal of Cancer Prevention 2016 Asian Pacific journal of cancer prevention Vol.17 No.4

Background: Infection with hepatitis B virus (HBV) is a major global public health problem, with a wide spectrum of clinical manifestations. Human cytosolic glutathione-S-transferases (GSTs) include several classes such as alpha (A), mu (M), pi (P), sigma (S), zeta (Z), omega (O) and theta (T). The present study aimed to investigate the role of GST omega genes (GSTO1 and GSTO2) in different groups of patients infected with HBV. Materials and Methods: HBV groups were classified according to clinical history, serological tests and histological analysis into normal carriers (N), acute (A), chronic (CH), cirrhosis (CI) and hepatocellular carcinoma (HCC) cases. The study focused on determination of the genotypes of GST omega genes (GSTO1 and GSTO2) and GST activity and liver function tests. Results: The results showed that GSTO1 (A/A) was decreased in N, A, CH, CI and HCC groups compared to the C-group, while, GSTO1 (C/A) and GSTO1(C/C) genotypes were increased significantly in N, A, CH, CI and HCC groups. GSTO2 (A/A) was decreased in all studied groups as compared to the C-group but GSTO2(A/G) and GSTO2(G/G) genotypes were increased significantly. In addition, GST activities, albumin and TP levels were decreased in all studied groups compared to the C-group, while the activities of transaminases were increased to differing degrees. Conclusions: The results indicate that GSTO genetic polymorphisms may be considered as biomarkers for determining and predicting the progression of HBV infection.

Numerical Investigation of the Effects of Primary Nozzle Diverging Portion on Performance of the Supersonic Ejector of an Ejector Refrigeration Cycle

Shaban Alyari Shourehdeli,Kamran Mobini,Ali Asakereh 대한설비공학회 2019 International Journal of Air-Conditioning and Refr Vol.27 No.3

A supersonic ejector with desirable performance characteristics reduces the energy consumption rate of an ejector refrigeration system and increases its coefficient of performance (COP). In this paper, the effects of using different primary nozzles on the performance of a supersonic ejector of an ejector refrigeration system have been numerically studied, while the working fluid is steam. To this end, conical, Rao and parallel-flow primary nozzles with identical converging portions and equal exit area to throat area ratios have been tested. The diverging portion curves for the parallel-flow and Rao nozzles were derived using the method of characteristics. Using the Rao nozzle, the critical entrainment ratio and the critical back pressure were increased compared to the conical nozzle by 6.3% and 2.08%, respectively. It was also found that the physics of the internal flow of the ejector was changed by changing the diverging curve of the primary nozzle.

Effects of Topical Tamoxifen on Wound Healing of Burned Skin in Rats

Shaban Mehrvarz,Ali Ebrahimi,Hedayat Sahraei,Mohammad Hasan Bagheri,Sima Fazili,Shahram Manoochehry,Hamid Reza Rasouli 대한성형외과학회 2017 Archives of Plastic Surgery Vol.44 No.5

Background This study aimed to assess the effects of the topical application of tamoxifen on wound healing of burned skin in Wistar rats by evaluating 3 healing characteristics: fibrotic tissue thickness (FTT), scar surface area (SSA), and angiogenesis in the healed scar tissue. Methods Eighteen male Wistar rats were used in this study. A third-degree burn wound was made on the shaved animals’ back, measuring 2×2×2 cm. In the first group, a 2% tamoxifen ointment was applied to the wound twice daily for 8 weeks. The second group received a placebo ointment during the same period. The third group did not receive any treatment and served as the control group. Results The median (interquartile range=[Q1, Q3]) FTT was 1.35 (1.15, 1.62) mm, 1.00 (0.95, 1.02) mm, and 1.25 (0.8, 1.5) mm in the control, tamoxifen, and placebo groups, respectively (P=0.069). However, the FTT in the tamoxifen group was less than in the placebo and control groups. The median angiogenesis was 3.5 (3.00, 6.25), 8.00 (6.75, 9.25), and 7.00 (5.50, 8.25) vessels per high-power field for the control, tamoxifen, and placebo groups, respectively (P=0.067). However, the median angiogenesis was higher in the tamoxifen group than in the control group. No significant difference was observed in the mean SSA between the tamoxifen group and the control group (P=0.990). Conclusions Local application of tamoxifen increased angiogenesis and decreased the FTT, with no change in the SSA in burned skin areas. These effects are expected to expedite the wound healing process, reducing contracture and preventing hypertrophic scar and keloid formation