Influence Of Preservative On The Tensile Strength Of The Tissue Of Porcine Circulatory System

Abstract

The paper provides an empirical analysis of the macroeconomic factors that enhance revenue gap in South Africa using the multivariate cointegration techniques for the period 1965 to 2012. The results from the cointegration analysis indicate that the revenue gap in South Africa is negatively associated with the level of imports while positively related to external debt and underground economy. The former finding is consistent with the notion that imports are subjected to more taxation than domestic activities because of certain features of international trade that tend to make tax evasion difficult. On the other hand, the positive relationship between external debt and tax gap shows that the South African government relies upon external debt to finance its budget deficit resulting from missing revenues. Furthermore, the observed negative effect of the post-apartheid dummy confirms that the tax policy reforms that South Africa introduced following the liberation in 1994 have led to a reduction in missing revenues. The results from the Granger causality test also show that there is a unidirectional causality running from imports and underground economy to revenue gap, while revenue gap on the other hand is found to Granger-cause national income and external debt in South Africa.

Bacterial cellulose as a promising material for pulmonary valve prostheses: In vivo study in a sheep model

“…The final product has an appropriate thickness (300–500 μm) as well as optimal physical and biological characteristics. The material is highly elastic but resistant to stretching and tearing, which confers the ability to adapt to fluid streams 13 along with greater durability than animal tissue 13,18 . The material is also characterized by good biocompatibility and apyrogenicity as well as appropriate nonpermeability and smoothness for blood, low thrombogenicity, and a low hemolysis index 13 …”

“…The material is highly elastic but resistant to stretching and tearing, which confers the ability to adapt to fluid streams 13 along with greater durability than animal tissue. 13,18 The material is also characterized by good biocompatibility and apyrogenicity as well as appropriate nonpermeability and smoothness for blood, low thrombogenicity, and a low hemolysis index. 13 We prepared appropriate BNC1 tubes with a diameter of 20 mm.…”