Antibacterial effect of Tradescantia pallida purpurea against fish (Labeo rohita) pathogens Antibacterial effects of Tradescantia pallida purpurea against fish pathogens

Diseases are recognized as one of the major restrictions to sustainable animal production which can cause significant economic loss in aquaculture. Even though there are various chemotherapeutic agents such as antibiotics and disinfectants in practice from centuries. Antibiotics have the potential to cause unwanted side effects as well as microbes get resistant against them. Now there is also a lot of research going to see the potential of natural products against pathogens. Tradescantia pallida purpurea plant has various bioactive compounds such as alkaloids, flavonoids, tannis and phenolic compounds Objective: The present study was conducted to testefficacy of Tradescantia pallida purpurea in chloroform extract against fish pathogens and also a comparison in methods (well diffusion and disc diffusion) was made Methods: Four fish pathogens (NP1, NP4, SCC4 and TS1) were isolated after morphological and biochemical tests. Erythromycin was used as control. 10 µg/ml chloroform leaf extract was used by well diffusion and disc diffusion Results: It was noticed that well-diffusion assay was better to inhibit growth of fish isolates as compared to disc diffusion method. It was noticed that Tradescantia pallidahaspotential to inhibit growth of pathogens. Conclusions: So, there is a need to plan a comprehensive study to recommend the maximum dose that is helpful to control fish pathogens.

Determinants of Firms’ Acquisition Ability and its Impact on Cost Efficiency, Operational Hedging and Returns of Acquirer Firms in Pakistan

The capital markets witness phenomenal shifts of corporate control. With the shift of world economy into a global one, there has been a rapid increase in the volume of acquisitions. The previous studies shed light on the motives behinds acquisition and its impact on both bidding and target firm. Less effort has been placed to check the ability of a firm dealing in market of corporate control. This study is bridging in the gap in literature by exploring the factors affecting the acquisition ability of the firm. The study has analysed the role of financial strength, corporate governance related variables and regulatory influence on acquisition ability of acquiring firm. Later on, impact of such acquisition ability has been tested on various firm characteristics like cost efficiency, returns and operational hedging of acquirer firms. Data has been analysed with respect to Pakistan stock Exchange for a period of 2004 to 2012. Empirical analysis indicates that firm specific variables are important determinants in firm’s decision to acquire. Chief Executive Officer duality and institutional shareholders presence on the board contributes to this important phenomenon in the life of the acquiring firms. Bidding firm’s financial strength is also another important considerations. The empirical results indicate the better acquisition ability for firms characterized by minimum capacity utilization, lower level of intangible assets, lower debt levels and lower advertising expenses. Acquisition announcement is an important event in the capital markets. The event study technique indicates the significant abnormal returns after 3 days of acquisition announcement. Cost efficiency has been analysed for bidding firms three years prior to the acquisition and three years post acquisition. Overall results suggest an improvement in the efficiency of financial firms after acquisition. Non-financial sector is indicating opposite results where most of the firms are showing declining trend in efficiency. The percentage change in operational volatility is accounted for as operational hedging. The empirical results show a large level decrease in the operational income volatility after the takeover deal. It shows that combined firm after acquisition bring the benefit of diversification thus reducing volatility and increasing operational hedging which may ultimately reduce financial hedging. So acquiring firms should analyse their strength before going for acquisition deal as acquisition impact their short term and long term performance. Key Words: Corporate Control, Acquisitions, Event Study, Data Envelopment analysis, Operational Hedging, Cost Efficiency, Abnormal Returns