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( Kamal ),( Ahmed ),( Anver Basha Shaik ),( C. Ganesh Kumar ),( Poornima Mongolla ),( P. Usha Rani ),( K. V. S ),( Rama Krishna ),( Suman Kumar Mamidyala ),( Joveeta Joseph ) 한국미생물 · 생명공학회 2012 Journal of microbiology and biotechnology Vol.22 No.1
In an ongoing survey of the bioactive potential of microorganisms from Ladakh, India, the culture medium of a bacterial strain of a new Pseudomonas sp., strain ICTB-745, isolated from an alkaline soil sample collected from Leh, Ladakh, India, was found to contain metabolites that exhibited broad-spectrum antimicrobial and biosurfactant activities. Bioactivity-guided purification resulted in the isolation of four bioactive compounds. Their chemical structures were elucidated by 1H and 13C NMR, 2D-NMR (HMBC, HSQC, 1H,1H-COSY, and DEPT- 135), FT-IR, and mass spectroscopic methods, and were identified as 1-hydroxyphenazine, phenazine-1-carboxylic acid (PCA), rhamnolipid-1 (RL-1), and rhamnolipid-2 (RL-2). These metabolites exhibited various biological activities like antimicrobial and efficient cytotoxic potencies against different human tumor cell lines such as HeLa, HepG2, A549, and MDA MB 231. RL-1 and RL-2 exhibited a dose-dependent antifeedant activity against Spodoptera litura, producing about 82.06% and 73.66% antifeedant activity, whereas PCA showed a moderate antifeedant activity (63.67%) at 60 μg/cm2 area of castor leaf. Furthermore, PCA, RL-1, and RL-2 exhibited about 65%, 52%, and 47% mortality, respectively, against Rhyzopertha dominica at 20 μg/ml. This is the first report of rhamnolipids as antifeedant metabolites against Spodoptera litura and as insecticidal metabolites against Rhyzopertha dominica. The metabolites from Pseudomonas sp. strain ICTB-745 have interesting potential for use as a biopesticide in pest control programs.
Nominal axial and flexural strengths of high-strength concrete columns
Mustafa Kamal Al-Kamal 사단법인 한국계산역학회 2019 Computers and Concrete, An International Journal Vol.24 No.1
The ACI building code is allowing for higher strength reinforcement and concrete compressive strengths. The nominal strength of high-strength concrete columns is over predicted by the current ACI 318 rectangular stress block and is increasingly unconservative as higher strength materials are used. Calibration of a rectangular stress block to address this condition leads to increased computational complexity. A triangular stress block, derived from the general shape of the stressstrain curve for high-strength concrete, provides a superior solution. The nominal flexural and axial strengths of 150 highstrength concrete columns tests are calculated using the proposed stress distribution and compared with the predicted strength using various design codes and proposals of other researchers. The proposed triangular stress model provides similar level of accuracy and conservativeness and is easily incorporated into current codes.
Nominal flexural strength of high-strength concrete beams
Al-Kamal, Mustafa Kamal Techno-Press 2019 Advances in concrete construction Vol.7 No.1
The conventional ACI rectangular stress block is developed on the basis of normal-strength concrete column tests and it is still being used for the design of high-strength concrete members. Many research papers found in the literature indicate that the nominal strength of high-strength concrete members appears to be over-predicted by the ACI rectangular stress block. This is especially true for HSC columns. The general shape of the stress-strain curve of high-strength concrete becomes more likely as a triangle. A triangular stress block is, therefore, introduced in this paper. The proposed stress block is verified using a database which consists of 52 tested singly reinforced high-strength concrete beams having concrete strength above 55 MPa (8,000 psi). In addition, the proposed model is compared with models of various design codes and proposals of researchers found in the literature. The nominal flexural strengths computed using the proposed stress block are in a good agreement with the tested data as well as with that obtained from design codes models and proposals of researchers.
Latent Semantic Analysis Approach for Document Summarization Based on Word Embeddings
( Kamal Al-sabahi ),( Zhang Zuping ),( Yang Kang ) 한국인터넷정보학회 2019 KSII Transactions on Internet and Information Syst Vol.13 No.1
Since the amount of information on the internet is growing rapidly, it is not easy for a user to find relevant information for his/her query. To tackle this issue, the researchers are paying much attention to Document Summarization. The key point in any successful document summarizer is a good document representation. The traditional approaches based on word overlapping mostly fail to produce that kind of representation. Word embedding has shown good performance allowing words to match on a semantic level. Naively concatenating word embeddings makes common words dominant which in turn diminish the representation quality. In this paper, we employ word embeddings to improve the weighting schemes for calculating the Latent Semantic Analysis input matrix. Two embedding-based weighting schemes are proposed and then combined to calculate the values of this matrix. They are modified versions of the augment weight and the entropy frequency that combine the strength of traditional weighting schemes and word embedding. The proposed approach is evaluated on three English datasets, DUC 2002, DUC 2004 and Multilingual 2015 Single-document Summarization. Experimental results on the three datasets show that the proposed model achieved competitive performance compared to the state-of-the-art leading to a conclusion that it provides a better document representation and a better document summary as a result.
Kamal Nagham H.,Essmat Ahmed,El Askary Hesham I.,El Hefnawy Hala M.,Wahab Samia M. Abdel,Meselhy Meselhy R. 한국응용생명화학회 2022 Applied Biological Chemistry (Appl Biol Chem) Vol.65 No.4
Stevia (Stevia rebaudiana Bertoni) is a natural zero calorie sweetener with significant economic and medicinal values due to its high contents of steviosides (SVGs) in the leaves. The aqueous extract of Stevia leaves (TAqE) was standardized to contain 8.5% w/w of SVGs (HPLC), total phenolics (164.63 ± 1.39 μg Gallic acid/mg extract) and total flavonoids of 100.5 ± 0.79 μg QE/mg extract. Twenty-one compounds were tentatively identified in the leaves via UPLC-Orbitrap HRMS and stevioside, rebaudioside A, and quercetrin were isolated from TAqE by repeated column chromatography. Stevioside showed significant inhibition of pancreatic lipase, α-amylase, and α-glucosidase enzymes. The effect of a standardized TAqE on high fat diet (HFD)-streptozotocin (STZ)-induced diabetic rats was investigated. Thirty-six animals were divided into 6 groups (each of 6). Rats in group I (control) and group II (control/HFD-STZ) received distilled water, and rats in groups III and IV received TAqE for 4 weeks in two doses; 300 mg/kg b.wt., and 500 mg/kg b.wt., respectively. Rats in group V received metformin (200 mg/kg), while those in group VI received statin (1 mg/kg). Body weight, fasting blood glucose, lipid profile (total cholesterol and triglycerides), liver enzymes (alanine transaminase and aspartic transaminase), and serum kidney parameters (urea and creatinine) were decreased in rats treated with TAqE (300 mg/kg b.wt.), while insulin sensitivity was enhanced, when compared to that in group II. These findings could justify the use of Stevia as a complementary medicine for the prevention and treatment of metabolic changes associated with diabetes mellitus type 2.
Proteomic Analysis of Stress Responses Protein in Wheat (Triticum aestivum L)
Kamal, Abu Hena Mostafa,Kim, Ki-Hyeon,Shin, Kwang-Hyun,Seo, Hyeong-Seok,Shin, Dong-Hoon,Hong, Lan-Seon,Park, Cheol-Soo,Jong, Young-Keun,Heo, Hwa-Young,Song, Beom-Heon,Lee, Chul-Won,Woo, Sun-Hee The Korean Society of Crop Science 2009 Korean journal of crop science Vol.54 No.1
Kamal Adel Amin,Basant Mahmoud Mohamed,Mohamed Aly M. El-wakil,Sanaa Omar Ibrahem 한국유방암학회 2012 Journal of breast cancer Vol.15 No.3
Purpose: Carcinoma of the breast is the most prevalent cancer among Egyptian women and constitutes 29% of National Cancer Institute cases. The aim of this study was to determine the effect of breast cancer on oxidative stress, cardiac markers and liver function tests, moreover the role of 5-fluorouracil, doxorubicin, and cyclophosphamide (FAC) in the treatment of breast cancer and its mechanism through changing the measured markers. Methods: Forty female breast cancer patients who were admitted to the Department of Oncology of the Beni-Suef University Hospital were enrolled in the study. This study included three arms: a control group of healthy age-matched females (n=20), breast cancer patients who weren’t receiving treatment (n=20), and patients undergoing treatment with anticancer combination drugs FAC (n=20). Blood samples collected from the control subjects and patients were analysed to determine levels of catalase, reduced glutathione (GSH), uric acid, nitric oxide (NO), malondialdehyde, creatine kinase (CK), lactate dehydrogenase (LDH), liver enzymes (alanine aminotransferase and aspartate aminotransferase), and creatinine. Results: The levels of catalase and GSH were significantly reduced (p<0.05) in breast carcinoma and FAC treated breast cancer patients. The lipid peroxidation and NO levels were significantly enhanced in both untreated and FAC treated breast cancer patients. The CK and LDH were significantly enhanced (p<0.05) in the FAC group. Conclusion: The results from the present study show that oxidative stress is implicated in breast carcinoma and chemotherapy aggravates this oxidative stress which causes damage to many cellular targets and has the main side effect of cardiotoxicity.