Synthesis and characterization of surface-enhanced Raman-scattered gold nanoparticles

In this paper, we report a simple, rapid, and robust method to synthesize surface-enhanced Raman-scattered gold nanoparticles (GNPs) based on green chemistry. Vitis vinifera L. extract was used to synthesize noncytotoxic Raman-active GNPs. These GNPs were characterized by ultraviolet-visible spectroscopy, dynamic light-scattering, Fourier-transform infrared (FTIR), transmission electron microscopy (TEM), X-ray diffraction (XRD), and Raman spectroscopy. The characteristic surface plasmon-resonance band at ~528 nm is indicative of spherical particles, and this was confirmed by TEM. The N–H and C–O stretches in FTIR spectroscopy indicated the presence of protein molecules. The predominant XRD plane at (111) and (200) indicated the crystalline nature and purity of GNPs. GNPs were stable in the buffers used for biological studies, and exhibited no cytotoxicity in noncancerous MIO-M1 (Müller glial) and MDA-MB-453 (breast cancer) cell lines. The GNPs exhibited Raman spectral peaks at 570, 788, and 1,102 cm-1. These new GNPs have potential applications in cancer diagnosis, therapy, and ultrasensitive biomarker detection.

Aquinas, Kant and eclipse of practical reason

The article examines the nature and scope of practical reason with regard to Saint Thomas Aquinas' work offering materials for defending a substantive view of practical rationality. Topics include the differences between procedural and substantive views of practical rationality, philosopher Christine M. Korsgaard's interpretation of philosopher Immanuel Kant's views on practical reason, and modern versions of the natural law theory.

Microscopic nature and elemental composition of brown coal fly ash particles from a large coal fired power station

In this study, Australian brown coal fly ash particles have been collected from power station and analysed by scanning electron microscopy to obtain morphological information and elemental composition of individual particles. The most common particles found to be the irregular shape particle aggregates. Other shapes include ball shape with smooth surface and with some attachments; and crystal shape fine particles. The X-ray spectra of each fly ash particle revealed five groups of elemental composition, they are Si-rich particles; Ca-rich particles; Fe-rich particles; particles with Mg-Ca Matrix and particles with Si-Ca matrix. A particle sire distribution analysis has been conducted using particle size analyser and found to have a mean particle size of 21fim. The sample then was separated into fine and coarse fractions using aerodynamic classifier, and the elemental composition of both fractions were determined by ICP-AES. Borate fusion and acid dissolution method was used for sample preparation. It is found that some environmental sensitive elements such as Zn, Pb, Ni, K and Cu are enriched in fine fly ash particles. Ca has much higher contents in fine particles as well. Si and Mg have higher concentrations in coarse particles.

Earthquake fatalities : the interaction of nature and political economy

To say that the level of fatalities resulting from an earthquake is inversely related to a country's per capita level of income is hardly novel. What makes our approach novel is that we relate fatalities to both per capita income and the level of inequality that exists within a country through their joint impact on the likelihood of collective action being taken to mitigate the destructive potential of quakes. We first develop a theoretical model which offers an explanation as to why, in some environments, different segments of society prove incapable of arriving at what all parties perceive to be an agreeable distribution of the burden of the necessary collective action, causing the relatively wealthy simply to self-insure against the disaster while leaving the relatively poor to its mercy. Following this, we test our theoretical model by evaluating 269 large earthquakes occurring worldwide, between 1960 and 2002, taking into account other factors that influence a quake's destructiveness such as its magnitude, depth and proximity to population centers. Using a Negative Binomial estimation strategy with both random and fixed estimators, we find strong evidence of the theoretical model's predictions. That is, while earthquakes themselves are natural phenomena beyond the reach of humankind, our collective inaction with respect to items like the creation and enforcement of building codes, failure to retrofit structures and to enact quake-sensitive zoning clearly plays a part in determining the actual toll that a given quake takes. And, it is through these and other examples of collective inaction that limited per capita income and inequality couple together with a given quake's natural destructive power in determining the actual fatalities resulting from a quake.

Perfecting nature : Friedrich Nietzsche's ideal and politics of cultivation

What I have called the Ideal of Cultivation is a fundamental ethical principle of civilisation, originated by aristocratic warriors in Greek antiquity who held that the true purpose of humanity is to perfect nature

It was then professed that individuals and even entire peoples could consciously develop and improve themselves in a way that was thought to obey the original lawful impulses of nature, a process which was likened to those of agriculture and animal husbandry.

Subsequently the cognate idea of a politics of cultivation arose which deemed that society should be organised specifically to produce more virtuous or perfect human types. Given their fundamental association with Hellenism both ideas have been revisited constantly in the intellectual history of the west, and most notably during the great secular periods, the Renaissance and Enlightenment when active attempts were made to retrieve the ideals of antiquity. Both ideas were particularly pervasive in the German enlightenment, the Aufklärung, and were assimilated by the succeeding Romantic generation.

In nineteenth century Germany, when interest in these ideas was quickly waning, the German philosopher Friedrich Nietzsche acquired an unswerving attachment to them and made the service of them his life's work.

The intention of this essay is to trace methodically the appearance of the Ideal of Cultivation in Nietzsche's philosophy and politics, and to outline his responses to a world which was abandoning the principles in which he deeply believed. This essay should be regarded as a case study in the long history of a fundamental ethical idea rather than one about the philosopher Nietzsche.

The traditional decision-making process of Berkaul in Tanjung Emas, West Sumatra : its nature and significance

Berkaul is a traditional practice associated with the rice cultivation cycle in West Sumatra, Indonesia, intended to seek consensus within the local community about agricultural practices and management of water for irrigation. Berkaul is deeply rooted in the adat and worldview of the region but is much less commonly practiced today than in the past and has disappeared in many parts of the region. This article describes the process of berkaul in Tanjung Emas, West Sumatra, places it within the context of Minangkabau adat and tradition, and considers its value in fostering participation, empowerment, and social inclusion in the context of rural development.

Nature, extent and antecedents of risk management in accounting, law and biotechnology firms in Australia

This paper provides empirical evidence on the nature and the extent of risks faced by small and medium-sized biotechnology and professional service firms (accounting and law) in Australia, as well as on the style of their adopted risk management methods and approaches. The findings of the study indicate that the top three risks faced by these firms are related to reputation, recruiting and retaining skilled staff, and cost management. The study also finds that more than half of the respondent firms manage risk in an integrated manner. The results of this study provide useful insights into the nature, extent and driving forces of risk management practices in these firms.

The emergent sea of nature and religion : a study of faith-based responses to issues of environmental sustainability

The research highlighted that the majority of adherents to faith groups in Australia showed a high level of concern to environmental issues; however, there is a need to provide wide-ranging community engagement programs. Further education is required considering there was uncertainty about some environmental issues, in particular climate change.

Electrochemical and quantum chemical assessment of two organic compounds from pyridine derivatives as corrosion inhibitors for mild steel in HCl solution under stagnant condition and hydrodynamic flow

 In this study, the inhibitive performance of two pyridine derivatives as corrosion inhibitors for mild steel was examined under stagnant condition and hydrodynamic flow in HCl solution at 25. °C. Potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) techniques were employed. To explore the inhibitors adsorption mechanism, Langmuir isotherm and quantum chemical studies were used. The results of electrochemical measurements show that the inhibitor concentration has a positive effect on its efficiency while for hydrodynamic condition, it is vice versa. Corrosion attack morphologies were observed at stagnant and hydrodynamic conditions to verify qualitatively the results obtained by electrochemical methods. © 2013 Elsevier Ltd.