The widespread use of antibiotics as therapeutic agents against pathogenic bacteria sometimes has presented a problem as the result of the development of drug resistance by the organism involved (Finland, 1956). Although the level of an antibiotic necessary to elicit a growth response in young animals is many times less than the therapeutic dose, drug-fast organisms have been found among the in...

Most studies of evolutionary rates, except those concerning laboratory populations, use data from fossils to measure amounts of change occurring over time (e.g., Raup and Crick 1981; Cracraft 1984; Stanley 1985; Futuyma 1986; Bookstein 1987, 1988, 1989; Campbell and Day 1987; Gingerich 1987; Rosenzweig et al. 1987; Forey 1988; MacFadden 1988; McNamara 1990; Taylor and Larwood 1990; Fenster and ...

Mersin is an international harbor city on the Mediterranean coast of Turkey. This city receives migrations from many other parts of Turkey and shelters people from various ethnic roots and different socioeconomic strata. The majority of inhabitants are Muslims. There is no clear data about the prevalence of smoking, alcohol and illicit drug use in Mersin. Previous studies conducted in different...