The First Recorded Occurrences and the Distribution of Physalia physalis (Hydrozoa: Physaliidae) in Algerian Waters

Samir Bachouche,Tarek Ghribi,Samir Rouidi,Mohamed Etsouri,Yasmine Belkacem,Rabah Selmani,Mostapha Djellali,Hadj Raouf Aissa,Samir Grimes 한국해양과학기술원 2022 Ocean science journal Vol.57 No.3

Recently, there have been recorded findings of the pleustonic siphonophore Physalia physalis Linnæus, 1758, in different regions of Algeria. Several colonies washed ashore during March and May 2021 along the Algerian coast. Thirty colonies were observed on surface water and stranded on the beach between March and May from Beni Saf (35.30182° N;-1.40293° W) to Skikda (36.916557° N;7.162915° E). The highest number of such strandings of this species was recorded in Tipaza and Algiers. This is the first record of P. physalis in Algeria, extending the previously known distributions from the tropical and sub-tropical latitudes of Atlantic, Pacific and Indian oceans and may represent a danger to human health and the coastal economy. Strandings of P. physalis were notably associated with sea surface current and wind forces pushing P. physalis to become stranded on beaches. Our findings highlight the need for a monitoring program to be developed to understand more about trends associated with changes in the distribution and impact of this species. This work provides an update on the spatial distribution of P. physalis in the Mediterranean Sea.

Meso-scale based parameter identification for 3D concrete plasticity model

Suljevic, Samir,Ibrahimbegovic, Adnan,Karavelic, Emir,Dolarevic, Samir Techno-Press 2022 Coupled systems mechanics Vol.11 No.1

The main aim of this paper is the identification of the model parameters for the constitutive model of concrete and concrete-like materials capable of representing full set of 3D failure mechanisms under various stress states. Identification procedure is performed taking into account multi-scale character of concrete as a structural material. In that sense, macro-scale model is used as a model on which the identification procedure is based, while multi-scale model which assume strong coupling between coarse and fine scale is used for numerical simulation of experimental results. Since concrete possess a few clearly distinguished phases in process of deformation until failure, macro-scale model contains practically all important ingredients to include both bulk dissipation and surface dissipation. On the other side, multi-scale model consisted of an assembly micro-scale elements perfectly fitted into macro-scale elements domain describes localized failure through the implementation of embedded strong discontinuity. This corresponds to surface dissipation in macro-scale model which is described by practically the same approach. Identification procedure is divided into three completely separate stages to utilize the fact that all material parameters of macro-scale model have clear physical interpretation. In this way, computational cost is significantly reduced as solving three simpler identification steps in a batch form is much more efficient than the dealing with the full-scale problem. Since complexity of identification procedure primarily depends on the choice of either experimental or numerical setup, several numerical examples capable of representing both homogeneous and heterogeneous stress state are performed to illustrate performance of the proposed methodology.

Gastroprotective effects of nebivolol and simvastatin against cold restraint stress-induced gastric ulcer in rats

Samaa Samir Kamar,Noha Samir Abdel Latif,Mohamed Fathi Mohamed Elrefai 대한해부학회 2020 Anatomy & Cell Biology Vol.53 No.3

Gastric ulcer is one of the most serious diseases. Nebivolol (Neb), a β1-blocker, exhibits vasodilator and anti-oxidative properties, simvastatin (Sim) antihyperlipidemic drug, exhibits anti-oxidative, anti-inflammatory properties and promote endogenous nitric oxide (NO) production. The aim of this study was to evaluate the gastroprotective effects of Neb and Sim against cold restraint stress (CRS)-induced gastric ulcer in rats. Rats were restrained, and maintained at 4°C for 3 hours. Animals were divided into six groups; control group, CRS group, and four treatment groups received ranitidine (Ran), Neb, Sim and both Neb and Sim. Treatments were given orally on a daily basis for 7 days prior to CRS. The gastroprotective effects of Neb and Sim were assessed biochemically by measuring variations in prostaglandins E2, NO, reduced glutathione and malondialdehyde, and functionally by estimating force of contractions of isolated rat fundus in the studied groups in response to acetylecholine stimulation and morphologically using hematoxylin and eosin staining, periodic acid Schiff’s reaction and immunohistochemistry for cyclooxygenase 2 in gastric mucosa. CRS caused significant ulcerogenic effect. Alternatively, pretreatment with Ran, Neb, and Sim significantly corrected biochemical findings, pharmacological and histological studies.

Cancer Screening Knowledge and Attitudes of Under- and Post-Graduate Students at Kasr Al Ainy School of Medicine, Cairo University, Egypt

Sedrak, Amal Samir,Galal, Yasmine Samir,Amin, Tarek Tawfik Asian Pacific Journal of Cancer Prevention 2016 Asian Pacific journal of cancer prevention Vol.17 No.8

Background: Increasing knowledge and awareness of cancer screening significantly influence health promotion behavior which could markedly reduce incidence rates. In many countries, health care providers are the principal source of information concerning cancer screening. This study was carried out to assess the level of knowledge concerning cancer screening among medical students, house officers and residents and to explore their attitude towards cancer screening practices. Materials and Methods: This cross-sectional study was conducted in Kasr Al Ainy Medical School at Cairo University in Egypt, with 300 undergraduate medical students and 150 postgraduates (interns and residents) enrolled. A pre-tested self-administered questionnaire was used to collect data from the study participants regarding personal and education-related information, knowledge about cancer screening and its sources, and attitude towards cancer screening. Results: More than 64% of participants had knowledge scores of ${\leq}10$ points (out of 24). The total knowledge score (out of 6 points) for breast cancer screening increased from $1.9{\pm}1.0$ to $2.3{\pm}1.2$ and $2.4{\pm}1.1$ for $4^{th}$, $5^{th}$ and $6^{th}$ year respectively, interns showed the highest score of $2.6{\pm}1.1$, P= 0.001. Year of enrollment at medical school was a significant positive predictor of acquiring knowledge about cancer screening (post graduate vs. undergraduate students) (OR= 1.30, C.I =1.01-1.63), lack of or none receiving of orientation/training about cancer screening was the sole negative significant predictor for proper knowledge about cancer screening (OR=0.50, C.I=0.31-0.82). Over 92% of students agreed that they had insufficient knowledge about cancer screening, 88.2% appraised the need to have enough knowledge in order to direct/advice patients, relatives and friends, and 93.7% required that the faculty should emphasize the importance of cancer screening in the delivered curricula at medical school. Conclusions: A relatively low to moderate level of knowledge about cancer screening was detected among the selected medical students regardless of their year of enrollment at medical school or their graduation status, which may implicate a negative impact on early cancer detection especially in a low resource country like Egypt.

OSCILLATORY BEHAVIOR OF A CERTAIN CLASS OF SECOND-ORDER NONLINEAR PERTURBED DYNAMIC EQUATIONS ON TIME SCALES

Samir H. Saker 대한수학회 2010 대한수학회지 Vol.47 No.4

This paper is concerned with the asymptotic behavior of solutions of the second-order nonlinear perturbed dynamic equation [수식] on a time scale T. By using a new technique we establish some sufficient conditions which ensure that every solution oscillates or converges to zero. Our results improve the known oscillation results on the literature for the perturbed dynamic equations on time scales. Some examples illustrating our main results are given.

Metformin for Lithium-induced Weight Gain: A Case Report

Samir Kumar Praharaj 대한정신약물학회 2016 CLINICAL PSYCHOPHARMACOLOGY AND NEUROSCIENCE Vol.14 No.1

Lithium is the first line treatment for maintenance treatment of bipolar disorder. Among the long term adverse effects, weight gain is likely to affect a subset of patients. There is no specific guideline for the treatment of lithium-induced weight gain. We report a young male with bipolar disorder who had significant weight gain with lithium (25 kg), which responded to metformin treatment at 500 mg twice daily. The proposed mechanism of weight lowering effect of metformin includes changes in hypothalamic physiology, including leptin and insulin sensitivity, as well as circadian rhythm changes affecting food intake, regulation of fat oxidation and storage in liver, skeletal muscle, and adipose tissue.

STUDIES ON GRAVITY BLIND BACKFILLING FOR GROUND STABILIZATION ABOVE ABANDONED UNDERGROUND MINES

Samir Kumar Pal,Subir Kumar Mukhopadhyay,Susmita Panda,Anup Kumar Tripathi 한국암반공학회 2010 한국암반공학회 학술대회 및 세미나 자료집 Vol.2010 No.10

Blind hydraulic backfilling is a commonly adopted technique for subsidence control of the strata over unapproachable water-logged underground excavations, particularly in coal mining. There are three variants in blind backfilling, viz., the hydro-pneumatic, the pumped-slurry, and the simple gravity backfilling. This paper mainly describes investigations carried out on gravity blind backfilling technique on the experimental model as well as in the field, since it is the simplest and the easiest among the three methods which can be used for stabilization of ground over old abandoned water-logged mines. On examination of the filling process, it was revealed that the basic process of filling occurs by sand transportation along one or more meandering channels. In the study, the relative influence of sand, water and air flow rates on the area of filling from a single inlet point and the hydraulic pressure loss per unit length were studied in detail. Inlet pressure variation with time, known as pressure signature, have been used to study the changes in the physical filling phenomena inside meandering channels and pre-jamming phase of filling. This procedure has the potential to maximize the sand throughput from a single inlet pipe at minimum possible time. Of all the above mentioned methods, simple gravity backfilling was found to be economic as well as efficient, especially when the flow rates are high. Some empirical relationships developed using multiple regression technique for use by the practicing engineers for the process control while employing this process are also discussed in the paper.

Chemopreventive Effects of Cardamom (Elettaria cardamomum L.) on Chemically Induced Skin Carcinogenesis in Swiss Albino Mice

Samir Qiblawi,Awdah Al-Hazimi,Mohammed Al-Mogbel,Ashfaque Hossain,Debasis Bagchi 한국식품영양과학회 2012 Journal of medicinal food Vol.15 No.6

The chemopreventive potential of cardamom was evaluated on 7,12-dimethylbenz[a]anthracene-initiated and croton oil–promoted mouse skin papillomagenesis. A significant reduction in the values of tumor incidence, tumor burden, and tumor yield and the cumulative number of papillomas was observed in mice treated orally with 0.5 mg of cardamom powder in suspension continuously at pre-, peri-, and post-initiational stages of papillomagenesis compared with the control group. The average weight and diameter of tumors recorded were also comparatively lower in the cardamom-treated mouse group. Treatment of cardamom suspension by oral gavage for 15 days resulted in a significant decrease in the lipid peroxidation level of the liver (P < .01). In addition, the reduced glutathione level was significantly elevated in comparison with the control group (P < .05) following cardamom suspension treatment. Taken together, these findings indicate the potential of cardamom as a chemopreventive agent against two-stage skin cancer.

INERTIAL PICARD NORMAL S-ITERATION PROCESS

Samir Dashputre,Padmavati,Kavita Sakure 경남대학교 기초과학연구소 2021 Nonlinear Functional Analysis and Applications Vol.26 No.5

Many iterative algorithms like that Picard, Mann, Ishikawa and S-iteration are very useful to elucidate the fixed point problems of a nonlinear operators in various topological spaces. The recent trend for elucidate the fixed point via inertial iterative algorithm, in which next iterative depends on more than one previous terms. The purpose of the paper is to establish convergence theorems of new inertial Picard normal S-iteration algorithm for nonexpansive mapping in Hilbert spaces. The comparison of convergence of InerNSP and InerPNSP is done with InerSP (introduced by Phon-on et al. [25]) and MSP (introduced by Suparatulatorn et al. [27]) via numerical example.

Identification of Abnormal Masses in Digital Mammography Images

Samir Kumar Bandyopadhyay,Indra Kanta Maitra,Ronnie Caytiles,Yvette Gelogo,Cho-hee Hong,Tai-hoon Kim 한국정보기술학회 2011 Proceedings of KIIT Conference Vol.2011 No.5

In this work a method have been develop to make a supporting tool to easy and less time consuming of identification of abnormal masses in digital mammography images. The identification technique is divided into two distinct parts; Formation of Homogeneous Blocks and Color Quantization after preprocessing. The type of masses, orientation of masses, shape and distribution of masses, size of masses, position of masses, density of masses, symmetry between two pair etc are clearly sited after proposed method is executed on raw mammogram for easy and early detection abnormalities.