Purpose – The purpose of this paper is to examine how contractor firms manage their relationships with extended supply chain tiers and investigate the range of ICT technologies used to facilitate such practices. Design/methodology/approach – An on-line questionnaire survey was conducted to gather information about supply chain management operations, supplier relationship management and the ICT technologies used by contractor firms to manage their extended supply chain tiers. Findings – The extended supply chain relationships of contractor firms are primarily composed of contractual, technical and financial entities, but findings suggest that the vision to consider extended supply chain firms when selecting suppliers are still myopic. Majority of ICT technologies are used between Tier 1 supply chain firms and there is an inconsistency in the number of technologies adopted with the extended supply chain tiers. Despite having a high involvement relationship with Tier 2 downstream firms, findings indicate a lack of use of ICT technologies to manage the organisational, personal and technological interactions with these firms. Research limitations/implications – On the basis of different relationship types this study develops an initial framework for management of supply chains that are facilitated by relevant ICT technologies. Originality/value – This paper provides insights into the management of extended supply chain firms by contractor firms from a relationship-centric perspective and develops an initial framework for relationship-centric supply chain management.

The concept of electronic trading (e-trading) has transformed supply chain interactions in many industries, yet little research explored its implementation by Architecture, Engineering and Construction (AEC) supply chain firms. E-trading relies on commercial information exchange by supply chain partners which is generally adopted through intermediary technology partners (Hub Providers) to facilitate the accurate and timely communication of transactional data between buyers and supplier. A case study was conducted to explore the challenges and barriers to implementation of cross-firm commercial information exchange. The study primarily involved investigation of the interfaces between software development and organizational functions assisting with the electronic exchange of commercial information (eCIX) implementation. Findings from the case study show that implementation of commercial information exchange is not an easy task with several themes of factors to be considered during delivery of such projects, namely technical, coordination, integration and organizational. The study contributes to the knowledge and deployment of e-trading solutions within the context of AEC firms, and should be of interest to the practitioners contemplating similar projects.

Bu çalışmada karanfil (Eugenia caryophylatta) yağına alternatif olarak nane yağı (Menta piperita) ve lavanta (Lavandula angustifolia) yağlarının gökkuşağı alabalıkları (Oncorhynchus mykiss) üzerinde anestezik etkileri değerlendirilmiştir. Balıklar anesteziye giriş için uçucu yağların farklı dozlarına (30, 40, 50, 100, 150 ve 200 mg/l) maruz bırakılmıştır. Sonuçlar, karanfil yağı ve nane yağının dozu arttıkça anesteziye giriş süresinin kısaldığını göstermiştir. Bununla birlikte, bu anesteziklerin dozu arttıkça anesteziden çıkış süresi uzamıştır. Karanfil yağının 40 ve 50 mg/l dozları ve nane yağının 200 mg/l dozu benzer anestezik etki göstermiştir. Lavanta yağı ise gökkuşağı alabalıklarında sedatif etki göstermiştir. Bu bulgular ışığında nane yağının gökkuşağı alabalıklarında anestezik olarak kullanılabileceği önerilmektedir.