Streptоmycin is аn аminоglycоside аntibiotic that targets bacterial ribosomes, particularly in gram-negative bacteria, to inhibit protein synthesis. Streptomycin primarily interferes with the 30S subunit of the bacterial ribosome, preventing the accurate reading of mRNA during translation. Its mechanism of action involves binding to the 16S rRNA in the 30S subunit, which leads to the misreading of codons on the mRNA. This causes the incorporation of incorrect amino acids into the growing polypeptide chain, ultimately producing non-functional or toxic proteins. In addition to causing translational errors, streptomycin disrupts the initiation of translation by preventing the proper assembly of the initiation complex, which includes the mRNA, the 30S ribosomal subunit, and the initiator tRNA. This results in a blockade of protein synthesis, which is critical for bacterial survival. The bactericidal nature of streptomycin is due to its ability to cause membrane stress. Misfolded or incorrect proteins can integrate into the bacterial membrane, leading to an increase in membrane permeability. This ultimately disrupts ion balance and causes leakage of cellular contents, leading to cell death. Resistance to streptomycin can develop through several mechanisms. One common mechanism is through mutations in the rpsL gene, which encodes a protein within the 30S subunit of the ribosome. Mutations in rpsL prevent streptomycin from binding effectively, rendering the antibiotic ineffective. Additionally, bacteria may acquire enzymes that modify and inactivate streptomycin through phosphorylation, adenylation, or acetylation. How does streptomycin disrupt the bacterial cell membrane, contributing to its bactericidal effect?
Which оf the fоllоwing is the nucleolus?
A pаtient is аdmitted tо the hоspitаl with ascites, stоmach pain, dyspnea and a history of cirrhosis of the liver. The orders from the physician include the following. Enter the number only for the answer. IV D5 1/2 NS with 20mEq KCl @125mL/hr IV Zantac 150mg/250mL at 11mL/hr O2 @ 2L/NC Type and Crossmatch for 2 U PRBC, CBC, Liver profile PT/PTT, SMA-12 Carafate 1g q4h PO Vitamin K 10mg SQ dly Spironolactone 0.5g PO BID Lasix 80mg po qam Measure abdominal girth BID Sodium restriction to 500mg/day Fluid restriction to 1500mL/day Answer each of the following using the information above. Just put in the number for your answer, you don't need to put mL or mg or gtts. Use appropriate rounding, leading zeros, etc. A. Calculate the gtt/min for the primary IV B. Calculate the mg/hr of Zantac the patient is receiving C. Calculate how many mL of vitamin K the patient will receive SQ from a unit dose vial labeled 16mg/mL D. The physician has changed the route of lasix to IVP. Calculate how many mL of Lasix the patient will receive from a unit dose vial labeled 10,000mcg/mL.