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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.
KAMAL A. EL-WASSAL 중앙대학교 경제연구소 2012 Journal of Economic Development Vol.37 No.4
This paper investigates the relationship between Foreign Direct Investment (FDI) and economic growth in a group of 16 Arab countries from 1970 to 2008. The empirical analysis also addresses the role of what are identified in the literature as local “preconditions” for deriving growth benefits from FDI. Using a dynamic panel approach, it is found that the impact of FDI on economic growth in Arab countries is limited or negligible. The findings also suggest that financial development, trade openness, human capital and infrastructure quality are not significantly improving Arab countries’ capacity to reap growth benefits from FDI. The paper suggests that the preconditions should not be seen as of equal importance. The sectoral composition of FDI plays a critical role in deriving FDI growth benefits which might make it a “necessary” precondition for FDI to promote economic growth, while other factors such as financial development, trade openness, human capital and infrastructure quality could be seen as sufficient preconditions for reaping FDI growth dividends. The paper’s findings have important policy implications as Arab countries can turn to domestic policy solutions to direct FDI inflows to the dynamic sectors and focus not only on FDI “quantity” but also on FDI “quality”. Meanwhile, efforts should be made to reform and improve institutional quality, macroeconomic policies, and domestic financial markets
Kamal, A.,El-Sayed Ahmed, A.,Yassen, T.I. The Kangwon-Kyungki Mathematical Society 2016 한국수학논문집 Vol.24 No.4
In this paper, we study Lipschitz continuous, the boundedness and compactness of the composition operator $C_{\phi}$ acting between the general hyperbolic Bloch type-classes ${\mathcal{B}}^{\ast}_{p,{\log},{\alpha}}$ and general hyperbolic Besov-type classes $F^{\ast}_{p,{\log}}(p,q,s)$. Moreover, these classes are shown to be complete metric spaces with respect to the corresponding metrics.
Kamal Raj Gosai,Tej Kumar Shrestha,Samuel D. Hill,Surya Man Shrestha,Bigya Gyawali,Daya Nidhi Gautam,Achyut Aryal 국립중앙과학관 2016 Journal of Asia-Pacific Biodiversity Vol.9 No.3
The sarus crane (Grus antigone antigone) is listed as “vulnerable” in the International Union for Conservation of Nature (IUCN) Red List of Threatened Species. Sarus cranes are distributed in the lowlands, but most live outside protected areas, especially in agricultural areas and wetlands of Nepal. The continuous expansion of agricultural land and the reduction of wetland habitats pose the greatest threats to the conservation of the species. We studied the sarus crane in the Rupandehi District of Nepal to understand their population structure, behavior, and current threats. We used the line (i.e., road) transect method from August 2013 to February 2014. The study area contained 147 sarus cranes. Agricultural land and wetland areas contained the highest number of sarus cranes. Our analysis showed that the population of sarus crane in the area has declined since 2007. Most sarus cranes lived in pairs. A single flock contained 13 cranes at maximum. Sarus crane behavior was not significantly different before and after the breeding seasons. Human–sarus crane conflict began when cranes started utilizing agricultural areas. The main threats to the hatching success and survival of sarus cranes in the Rupendehi District are egg theft and the hunting of cranes for meat. The findings of this study establish baseline information on the overall conservation status, habitat availability, and ecological behavior of sarus cranes in the district. We propose regular surveys to monitor sarus crane population levels in the face of multiple anthropogenic threats to their survival.