this research investigates the effect of the post-cure time on the residual stresses in laminated composites. laminated composites were made of t300 carbon fibers and epoxy resin. the post-cure process was carried out at the constant temperature of 120 °c for 6 and 12 hours for two specimens. the slitting method was employed to determine through-thickness residual stress distribution of the com...

introduction: the purpose of this in vitro study was to compare the ability of triple antibiotic paste (tap) to calcium hydroxide (ch) in disinfecting dentinal tubules. material and methods: sixty root blocks were obtained from extracted single-rooted human teeth. the root canals were enlarged with gates-glidden drills up to size 3 and were contaminated with enterococcus. faecalis ( e. faecalis...

In Israel with its semi-arid climate, water is a limited resource and yet, in the last two decades about 60% of all of Israel’s water resources are directed for agricultural use. This is feasible due to the capacity to recycle water. Treated wastewater (TWW) has become an important source of irrigation water in Israel and other parts of the world due to the pressures of increasing population an...

the residual stresses in composite laminates depend on several factors including the conditions of fabricating process, property of materials, direction and lay-ups of the layers. however the thermo-elastic behavior of composite is one of the most important parameters affecting the magnitude of residual stresses. the elastic properties and residual stresses do not remain constant under cyclic t...

introduction: this study examines the antibiotic prescription in dentists participated in 9 th congress of iranian association of endodontists in esfahan/2006. materials and methods: a questionnaire for this cross sectional study was designed for evaluating the patterns of antibiotic prescription. it included some demographic information, clinical signs, and conditions in need for antibiotic an...

The binding of antibiotics to plasma (serum) proteins through hydrogen bonding can significantly influence the biological characteristics of these drugs. A rapid spectrophotometric assay has been developed that measures the level of free (unbound) penem antibiotic in serum ultrafiltrates. Whole human serum was adjusted to a standard concentration of antibiotic and then filtered by centrifugatio...

Escherichia coli are beneficial bacteria found in human intestinal tracts. However, certain E. coli strains are pathogenic and can cause serious infections, such as neonatal sepsis and meningitis. The goal of this work is to create an awareness of the phenomenon of bacterial adaptation to antibiotics. We demonstrate that the pre-exposure of E. coli to low levels of antimicrobial agents (inducer...

Several environmental factors during the prenatal period transgenerationally affect the health of newborns in later life. Because low-dose antibiotics have been used for promoting the growth of crops and livestock in agriculture, humans may have ingested residual antibiotics for several decades. However, the effect of prenatal administration of low-dose antibiotics on newborns' health in later ...

This study reports the antibiotic resistance patterns of coagulase negative staphylococci (CNS) isolated from a drinking water treatment plant (WTP), a drinking water distribution network, responsible for supplying water to the consumers (WDN), and a wastewater treatment plant (WWTP), responsible for receiving and treating domestic residual effluents. Genotyping and the 16S rRNA gene sequence a...