Search results for "Lead"
showing 10 items of 1360 documents
Lead(II) ions adsorption onto amyloid particulates: An in depth study
2022
The production of new cost-effective biocompatible sorbent sustainable materials, with natural origins, able to remove heavy metals from water resources is nowadays highly desirable in order to reduce pollution and increase clean water availability. In this context, self-assembled protein materials with amyloid structures seem to have a great potential as natural platform for a broader development of highly-tunable structures. In this work we show how protein particulates, a generic form of protein aggregates, with spherical micro sized shape can be used as adsorbents of Pb2+ ions from aqueous solution. The effect of pH, ionic medium, ionic strength and temperature of the metal ion solution…
History of bioavailable lead and iron in the Greater North Sea and Iceland during the last millennium – A bivalve sclerochronological reconstruction
2014
We present the first annually resolved record of biologically available Pb and Fe in the Greater North Sea and Iceland during 1040-2004 AD based on shells of the long-lived marine bivalve Arctica islandica. The iron content in pre-industrial shells from the North Sea largely remained below the detection limit. Only since 1830, shell Fe levels rose gradually reflecting the combined effect of increased terrestrial runoff of iron-bearing sediments and eutrophication. Although the lead gasoline peak of the 20th century was well recorded by the shells, bivalves that lived during the medieval heyday of metallurgy showed four-fold higher shell Pb levels than modern specimens. Presumably, pre-indus…
Reversible Colorimetric Probes for Mercury Sensing
2005
The selectivity and sensitivity of two colorimetric sensors based on the ruthenium complexes N719 [bis(2,2'-bipyridyl-4,4'-dicarboxylate)ruthenium(II) bis(tetrabutylammonium) bis(thiocyanate)] and N749 [(2,2':6',2' '-terpyridine-4,4',4' '-tricarboxylate)ruthenium(II) tris(tetrabutylammonium) tris(isothiocyanate)] are described. It was found that mercury ions coordinate reversibly to the sulfur atom of the dyes' NCS groups. This interaction induces a color change in the dyes at submicromolar concentrations of mercury. Furthermore, the color change of these dyes is selective for mercury(II) when compared with other ions such as lead(II), cadmium(II), zinc(II), or iron(II). The detection limit…
Managerial Behavior in the Lab: Information Disclosure, Decision Process and Leadership Style
2019
This paper reports the results from a lab experiment in which subjects playing the manager role can implement either an efficient / inegalitarian allocation or an inefficient / egalitarian allocation of payoffs. The experiment simulates a stylized managerial context by allowing the manager to manipulate information and select the decision process and by allowing the stakeholders to retaliate against the manager given different choices in the decision process. We found that the inefficient allocation is often selected and that this choice depends on whether the employees can retaliate against the manager and on whether the manager can hide information about the payoffs. The social preference…
Collaborative Educational Leadership: The Emergence of Human Interactional Sense-Making Process as a Complex System
2014
The article aims at explicating the emergence of human interactional sense‐making process within educational leadership as a complex system. The kind of leadership is understood as a holistic entity called collaborative leadership. There, sense‐making emerges across interdependent domains, called attributes of collaborative leadership. The attributes give rise to the complex system. They are suggested to be the very agents, i.e. both the source and the outcome of the synergetic sense‐making process. Hence, the agents are not the single persons involved who, however, supply the collective attributes that are modified through human interaction in a holistic way. For studying the emergence pro…
From the Publisher: The Journal Human Technology: An Ongoing Resource for Human-Technology Research
2012
The purpose of this paper is to present the theoretical basis for a measurement and improvement system that will help organizations create a more innovative climate. The role of intangible assets in contributing to organizational innovativeness is clarified within six hypotheses on the basis of a cross-disciplinary literature review combining studies from psychology, human resources management, communication, information technology, and marketing. These factors range from the individual level to interaction with the environment surrounding the organization, and involve (a) individual psychological flexibility, (b) institutional and interpersonal trust, (c) diverse human resources, (d) strat…
Successful SME web design through consumer focus groups
2011
Purpose – The purpose of this research is to pursue two major objectives. First, to identify the key design variables for building successful transactional SME (Small Medium Enterprises) websites. Second, the transactional relevance of each key design variable is tested in order to establish priorities.Design/methodology/approach – The present paper is developed through seven consumer focus groups. Two approaches were used: an ethnographic summary of each focus group (qualitative approach) and a systematic coding procedure (quantitative approach).Findings – The findings indicate that a transactional website should have three main strong points: it must be secure; price information should be…
Transformational leadership and absorptive capacity: an analysis of the organisational catalysts for this relationship
2017
ABSTRACTResearch analysing the antecedents of a firm’s absorptive capacity suggests that transformational leadership (TL) is one of its main determinants. However, the few studies focusing on the relationship between these two variables do not explicitly assess why transformational leaders facilitate knowledge acquisition, sharing and retention inside firms. This paper suggests that the reason is that the former contributes to the creation of an organisational context that favours learning processes. We test our research model on a sample of 467 Spanish industrial firms. Findings provide evidence that TL is positively related to the firm’s absorptive capacity and that this relationship is m…
Management by objective enhances innovation behavior: An exploratory study in global management consulting
2018
The goal of this study is to explain the complex effect of management by objective practices on employees' innovative behavior. Instead of considering individual goal orientation and/or formal creativeness-related goal assignment (as in the recent literature), the focus of this paper is on exploring whether the official adoption of management by objective practices may foster employee innovative behavior. Basing on the results of 2 exploratory interviews with 2 senior managers of 2 global consulting companies, we build our conceptual model. We use a goal-based view to this purpose. Then, we test the model by using data collected by surveying 80 consultants employed in 17 different managemen…
Digital innovations in rural micro-enterprises
2020
Digitalization gives micro-enterprises and rural areas new possibilities and it can support their competitiveness. In this paper, we have presented one way of supporting the diffusion and adoption of digital innovations in rural micro-enterprises. First, we examined the challenges and digital competence of the micro-enterprises in the rural areas of Central Finland to better understand what they needed. The second step was to develop a workshop concept. Theories of innovation diffusion and adoption were used as a base for these workshops. The last step was to evaluate the developed concept, its effects and challenges. We found that the workshop concept worked well for spreading information,…