فهرست مطالب f. soheili

Scientific exchanges and easy access to the required information are necessary for the scientific growth and dynamism of society. Scientific social networks as platforms for scientific exchanges can play important role in the development of scientific communities. Today, with the expansion of the applications of information and communication technology in everyday life, we are witnessing the formation of a new generation of Internet tools that have provided countless possibilities for mutual relations, negotiation, dialogue and, in general, two-way communication. Scientific social networks are an environment for the introduction and promotion of scientific activities and in fact, the more relevant information they can provide, the more they will be welcomed by experts, and the gathering of more experts in these networks means more scientific dynamism. The purpose of this study is to describe the experience of information science professionals about the relevance of information in ResearchGate scientific network.

This research is a qualitative research with a conceptual phenomenological design. The reason for choosing this method is because experiences of people requires a deep description of a certain phenomenon to a specific group of people and also one of the suitable fields for conducting research. Interpretive paradigm of phenomenological method is research in the field of information retrieval, which is important in information science and epistemology. Participants in present study are 22 experts and faculty members (9 males and 13 females) in the field of information science and epistemology in Iranian universities who are members of the research social science network. Participants were selected using purposeful sampling. Data was collected from semi-structured interview method, then coded and analyzed using Dickelman method.

The results of the interviews analysis led to the extraction 551 initial code and four categories: Relevance of the document, relevance of the successor to the document, the relevance of the requests and questions, and the lack of relevance feedback.

The results emphasize showed that Researchgate network plays an important role in meeting information needs of users. The network is not an information system, a forum for meeting scientific needs and promoting science.

Considering the important role of social networks, this study aims to identify factors affecting relevance in LinkedIn .

17 information specialists participated in the study. Data was collected using semi-structured interviews, then coded and analyzed using Dickelman method.

441 primary codes and seven categories including information system, retrieval system, document attributes, database attributes, user attributes, requests and queries, and feedback.

LinkedIn plays an important role in meeting the information needs of the participants

Insulin resistance plays an important role in the development of abnormalities such as impaired glucose tolerance, type 2 diabetes, obesity, and hyperlipidemia. The discovery of protein tyrosine phosphatase 1b (PTP-1B) seems to be a milestone in the investigation of insulin signaling transmission. Thus the purpose of this study was to evaluate the effect of 6 weeks of high intensity interval training (HIIT) on expression of PTP-1B in the muscle tissue in type 2 diabetic rats.. In this study, 20, ten week old diabetic male rats were randomly divided into high intensity interval and control groups. The training group performed training protocol on a treadmill for 6 weeks and 5 session/week, with gradual increase in speed (25-35 m/min) during scheduled runs. Forty-eight hours after the last training session blood and tissue (from gastrocnemius) sampling were carried out in diabetic rats and PTP-1B gene expression was evaluated by Rea-Time PCR method. Data was analyzed using independent t-test and Shapiro Wilk at a significant level of p≤0/05. Findings show that PTP-1B was decreased in the diabetic rats of HIIT group but was not significant (P=0.432). Also, insulin resistance index and fasting glucose significantly were decreased in HIIT group (P=0.001), but serum insulin was increased (P=0.001). According to the results, it seems that HIIT does not affect PTP-1B gene expression, but it improves type 2 diabetes and insulin resistance.