City University London

About: City University London is a education organization based out in London, United Kingdom. It is known for research contribution in the topics: Population & Context (language use). The organization has 5735 authors who have published 17285 publications receiving 453290 citations.

Wavelength-based localized surface plasmon resonance optical fiber biosensor

Abstract: Two types of localized surface plasmon resonance (LSPR)-based optical fiber biosensors using gold nanospheres (GNSs) and gold nanorods (GNRs) have been developed and their performance characteristics evaluated and cross-compared successfully in this work. Based on the results obtained from the optimization of each of these types of biosensor and reported by the authors elsewhere, GNSs with a diameter of 60 nm and GNRs with an aspect ratio of 4.1 were specifically chosen in this work for the fabrication of two representative sensor probes, with an aim to create a highly sensitive and wavelength-based LSPR sensor to overcome the limitations arising from other intensity-based sensors. In order to develop effective LSPR biosensors, both GNSs and GRNs respectively were immobilized on an unclad surface of an optical fiber, prior to the functionalization with human IgG in order to create a device for the detection of anti-human IgG, at different concentrations. The experimental results obtained from tests carried out show that the sensitivities of GNSs and GNRs-based LSPR sensors to refractive index variation are 914 and 601 nm/RIU respectively; however as biosensors they have demonstrated the same detection limit of 1.6 nM for the detection of anti-human IgG.

The use of picture/word matching tasks to assist word retrieval in aphasic patients

Abstract: Three single case studies and a small group study were undertaken to examine the effects of using picture to word matching tasks as a therapeutic technique in aiding word retrieval in aphasic patie...

Managerial Ownership, Board Structure and Firm Value: The UK Evidence

Abstract: We analyze the simultaneous relationship between managerial ownership, board structure, and firm value, using a sample of all UK non-financial listed companies. We test the hypothesis that managers in the UK should become entrenched at a higher level of ownership compared to their US counterparts because of institutional differences across the two markets. We find a strong U-shaped relationship between the level of managerial ownership and the probability that the roles of chairman and CEO are split, that a non-executive director is appointed as chairman, and the proportion of non-executive directors on the board. However, we report a generally weak relationship between firm value and managerial ownership, board structure and the combination of managerial ownership and board structure. Our results cast doubt on the effectiveness of these internal corporate governance mechanisms.