Asmall puncture wound on a woman's arm has become swollen, hot to the touch, and intensely painful. there is tissue necrosis, but it is not "gassy," and under the microscope gram-positive cocci in chains are present. which of the following microbes is likely to be responsible?
a) clostridium perfringensb) pseudomonas aeruginosac) streptococcus pyogenesd) staphylococcus aureuse) sporothrix schenckii

The correct answer is C) Streptococcus pyogenes

Explanation:

Streptococcus pyogenes are aerotolerant, gram-positive cocci present in chains which come under the genus streptococci. They are important for humans clinically as they are responsible for fatal infections in humans.

It is also called group A streptococcus or flesh-eating bacteria. It is responsible for causing Necrotizing fasciitis which is a skin infection. This infection can occur when the bacteria get into punctured skin and grow there.

After the infection of this bacteria, the first symptoms are warm red skin which converts into red bump which grows further into blister bump that is intensely painful which can become fatal if not properly treated.

So here Streptococcus pyogenes is likely to be responsible.

correct answer is option a.

tropopause, stratopause and mesopause have all in common aspect that is point of maximum temperature in its layer of the atmosphere. all layers of atmosphere observe abrupt change in temperature. tropopause is the boundary between troposphere and stratosphere. stratopause is the boundary between stratosphere and mesosphere. mesopause is the boundary between mesosphere and thermosphere. these all boundaries are ranges between altitude of 0 to 80 km.

step 1 ammonium can be absorbed by plants, but some is converted into nitrates which are better for plants to absorb. this is called nitrification. 2. step 2 the deer eats the plants and uses the nitrogen-containing proteins for cell growth. 3. step 3 bacteria in the soil conduct nitrogen fixation to convert nitrogen gas from the atmosphere into ammonium. 4. step 4 some of the nitrates are absorbed back into plants, but denitrification breaks down the nitrates into nitrogen gas released back into the atmosphere. 5. step 5 nitrogen is found in the urine, which gets broken down into ammonium through the process of ammonification. 6. step 6 plants absorb the ammonium and begin assimilation, the process to add the nitrogen to protein.