World of Microbiology

Typhoid Mary: Carrier of Salmonella typhi In 1869 girl named Mary Mallon born in Ireland. Mary emigrated to US in 1884, started working as a domestic help to the wealthy families and later became a cook. Mary was a healthy carrier of Salmonella typhi bacteria which is responsible for typhoid fever and killed many people unknowingly, later she stigmatized as 'Typhoid Mary'. Before going to further details about 'typhoid Mary' first know what is typhoid fever. What is Typhoid fever Typhoid fever is a serious enteric fever caused by bacterium,  Salmonella enterica, serovar typhi   also known as  Salmonella typhi . It is a gram negative, unicellular, motile (flagella present all around the cell),  facultative aerobes and non spore forming bacterium belongs to Enterobacteriaceae family. Salmonella typhi under scanning electronic microscope Salmonella typhi once enter into the body through mouth reach to intestinal cells and infect them, the

Salt lakes/Soda lakes Definition Salt lakes are naturally occurring highly alkaline aquatic bodies, widely spread throughout the world. Salt lakes are ecosystem with extremely high pH (up to 11) and salinity (up to saturation) due to the presence of high concentrations of sodium carbonate. Salt lakes, located in Kenya and Tanzania (Bogoria, Magadi, Natron), in Egypt (Wadi Natrun), and California (Mono Lake) are good example of typical salt lakes. Another area abundant in saline alkaline lakes is Central Asia (south Siberia and north-east China). Here the lakes are much smaller, more shallow, and water regimen is unstable due to freezing winter period which cause fluctuations of the water salinity and temperature. There are so many salt lakes and salt deserts around the world. Some of them are listed below.           source:  https://d-nb.info/968508480/34 Formation of Salt Lakes One of the theory suggest that rocks are made up of high amount o