Antibiotic Streptomycin Essay Example | Topics and Well Written Essays - 500 words

Antibiotic Streptomycin - Essay Example Streptomycin is classified chemically as an aminoglycosidic antibiotic and some of the other aminoglycosides include kanamycin, neomycin, tobramycin and amikain. In general all aminoglycoside make use of their inhibitory action by blocking protein synthesis in bacteria. Streptomycin kills bacteria by inhibiting protein synthesis by combining irreversibly with the 30S subunit of the70S ribosomes, found typically in prokaryotes. To be more specific, it binds with the S12 protein which is involved in the initiation of protein synthesis. Researchers have found through experiments that streptomycin stops the initiation of protein synthesis by blocking the binding of initiator N-formylmethionine tRNA to the ribosome. Besides, Streptyomycin is also known to stop the normal dissociation of 70S ribosomes into their 50S and 30S subunits. Therefore formation of polysomes is inhibited. Streptomycin action involves distorting the ribosome so that transition from initiation complex (30S-mRNA-tRNA) to chain elongating ribosome is blocked. As a result of this the normal sequence of translation is disrupted and the bacteria is unable to synthesize proteins which is vital for its cell growth and thereby fails to survive. Studies also have shown that the drug also disrupts the cell membrane of susceptible bacteria. Over the years many bacterial species, such as Bacillus subtilis Strain S

Stereotypes in Gender Essay Example | Topics and Well Written Essays - 2250 words

Stereotypes in Gender - Essay Example The very fact that the women gave birth made it someway mandatory that they take care of the children. The women’s terrain got defined inside her house. Â  When children grow up, it is the environmental conditioning that works strongly to establish this stereotype. Parents set examples, not because they intend to, but as a normal trend of daily activities and behavior. The child watches the father managing the office and the mother taking care of the cooking or the new baby. Girls usually take their mothers as their role models and boys go after their fathers. According to Dr. Benjamin Spock, people are likely to appreciate girls cuteness and boys achievements. Similar gender identification is followed even in schools where a preschooler is taught to distinguish between the man and the woman through the length of the hair or the dress they are wearing. Even gifts given to children support this distinction; girls are traditionally given dolls, while boys are given cars or sports items. Advertisers target their goods at the gender-specific audience and try to influence spending in separate male and female domains. Researcher Krisanne Bursik conducted a study about ego development at Suffolk University in Boston and compared the results to gender-related traits; of the 209 undergrads that she studied, she found that students who had higher levels of ego development were more likely to express non-traditional gender role traits. Male students, those who had less-developed egos viewed high levels of traditional masculinity as the ideal. She noted that in these men, "gender role conflict may occur for men when rigid, sexist or restrictive gender roles, learned during socialization, result in the personal restriction, devaluation, or violation of others or self." Â