University of Malaya

About: University of Malaya is a education organization based out in Kuala Lumpur, Malaysia. It is known for research contribution in the topics: Population & Fiber laser. The organization has 25087 authors who have published 51491 publications receiving 1036791 citations. The organization is also known as: UM & Universiti Malaya.

Multispectroscopic and Molecular Modeling Approach To Investigate the Interaction of Flavokawain B with Human Serum Albumin

Abstract: Interaction of flavokawain B (FB), a multitherapeutic flavonoid from Alpinia mutica with the major transport protein, human serum albumin (HSA), was investigated using different spectroscopic probes, i.e., intrinsic, synchronous, and three-dimensional (3-D) fluorescence, circular dichroism (CD), and molecular modeling studies. Values of binding parameters for FB–HSA interaction in terms of binding constant and stoichiometry of binding were determined from the fluorescence quench titration and were found to be 6.88 × 104 M–1 and 1.0 mol of FB bound per mole of protein, respectively, at 25 °C. Thermodynamic analysis of the binding data obtained at different temperatures showed that the binding process was primarily mediated by hydrophobic interactions and hydrogen bonding, as the values of the enthalpy change (ΔH) and the entropy change (ΔS) were found to be −6.87 kJ mol–1 and 69.50 J mol–1 K–1, respectively. FB binding to HSA led to both secondary and tertiary structural alterations in the protein as revea...

Biosynthesis and characterization of silver nanoparticles prepared from two novel natural precursors by facile thermal decomposition methods.

Abstract: In this work, two natural sources, including pomegranate peel extract and cochineal dye were employed for the synthesis of silver nanoparticles. The natural silver complex from pomegranate peel extract resulted in nano-sized structures through solution-phase method, but this method was not efficient for cochineal dye-silver precursor and the as-formed products were highly agglomerated. Therefore, an alternative facile solid-state approach was investigated as for both natural precursors and the results showed successful production of well-dispersed nanoparticles with narrow size distribution for cochineal dye-silver precursor. The products were characterized by X-ray diffraction (XRD), Scanning Electron Microscopy (SEM), Energy dispersive X-ray microanalysis (EDX), and Transmission Electron Microscopy (TEM).

A comprehensive review on energy efficient CO2 breakthrough technologies for sustainable green iron and steel manufacturing

Abstract: Iron and steel industry is the largest energy consuming manufacturing sector in the world. It is responsible for emitting 4–5% of the total anthropogenic CO2. Due to consistently increasing demand of iron and steel products for human needs, fossil-fuel energy use and CO2 emission will continue to grow in this industry. So there is a strong motivation to develop and implement energy-efficient and low-carbon technologies as well as carbon reduction programs for this industry. Enhancing the development and deployment of high-temperature waste heat energy recovering technologies along a desired combination of carbon capture and storage (CCS) technologies will be the effective solution to reducing CO2 emissions from iron and steel production. The aim of this paper is to provide a comprehensive overview of the worldwide carbon reduction programs and new CO2 breakthrough technologies for energy saving and carbon capture and storage in iron and steel making processes by collating updated information from a wide range of sources. Also, a discussion on the selection of the appropriate technology and their barriers and stages of development and deployment is presented. It is found that lots of factors that limit the role of using biomass in CO2 abatement, so implementation of CCS technology in coal-based integrated steel plant would be an efficient means for sustainable green iron and steel manufacturing.

Virtual Teams: a Literature Review

Abstract: In the competitive market , virtual teams represent a growing response to the need for fasting time-to- market, low-cost and rapid solutions to complex organizational problems. Virtual teams enable organizations to pool the talents and expertise of employees and non-employees by eliminating time and space barriers . Nowadays, companies are heavily investing in virtual team to enhance their performance and competitiveness. Despite virtual teams growing prevalence, relatively little is known about this new form of team. Hence the study offers an extensive literature review with definitions o f virtual teams and a structured analysis of the present body of knowledge of virtual teams. First, we distinguish virtual teams from conventional teams , different types of virtual teams to identify where current knowledge applies. Second, we distinguish what is needed for effective virtual team considering the people, process and technology point of view and underlying characteristics of virtual teams and challenges they entail. Finally, we have identified an d extended 12 key factors that need to be considered, and describes a methodology focused on supporting virtual team working, with a new approach that has not been specifically addressed in the existing literature and some guide line for future research extracted.