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The most common mechanism for an acute low back strain is extension with trunk rotation.
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Answer:
Plants are a good starting point when looking at the carbon cycle on Earth. Plants have a process called photosynthesis that enables them to take carbon dioxide out of the atmosphere and combine it with water. Using the energy of the Sun, plants make sugars and oxygen molecules
Explanation:
The primary symptoms of Parkinson's disease are muscular rigidity, slowness of movement, a resting tremor, and postural instability.
<h3>What are the causes of Parkinson’s disease?</h3>
- Parkinson's disease is a disorder of the central nervous system which results in unintended movements like uncontrolled shaking, stiffness, and difficulty to coordinate and balance.
- This is caused due to damage of nerve cells in the basal ganglia of brain which leads to decrease in levels of dopamine (a neurotransmitter).
- Nerve endings that release norepinephrine also get damaged.
- Initially the symptoms are mild which gradually worsen as the disease progresses.
- It leads to behavioral changes, fatigue, sleep disorders, depression.
- This disease can be controlled by taking medications which increase the level of dopamine and other neurotransmitters and by performing therapies which control body movements.
Learn more about Parkinson’s disease here:
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Answer:
Explained below:
Explanation:
Investigators are responsible for the security of the research animals in their attention from the most initial stages of the plan until a study is finished.
As before using animals, investigators must have IACUC approval, before implementing significant changes in their use of animals, investigators also need to get IACUC approval necessarily. Pontificating changes in the use of animals that may be a dormant change in scope, which includes changes in the production section.
Answer:
Semi-conservative replication
Explanation:
After the double-helix discovery of Watson and Crick, there were three possible models about the DNI replication:
- The Conservative model stated that the two strands of DNI together were the template of another new molecule. The final product was the original double-stranded molecule and the new molecule.
- The semi-conservative model stated that the original DNI molecule separated into two strands, and each of them served as a template for the synthesis of a new complementary strand. The replication product would be two double-stranded DNA molecules, each carrying an original strand a new one.
- The Dispersive moles stated that the replication product would be two molecules made by a mixture of segments of the original and the new molecules.
Meselson and Stahl joined to discover which of the models was the correct one. To do it they used E. coli and Nitrogen isotopes.
- First, they extracted DNI from bacteria grown in a medium with N¹⁴ and got its density band by centrifugation.
- Then they grew bacteria in a medium with N¹⁵, extracted their DNI molecules, centrifugated them, and got the density band, which was heavier than the firsts ones.
- The researchers then transferred bacteria grown in medium with N¹⁵ to a medium with N¹⁴, and they allowed only one replication process to occur. DNI was extracted and centrifugated again, and a new band appeared. This band was an intermediate form between bands of DNI-N¹⁵ and DNI-N¹⁴.
This event <em>eliminated the conservative model</em>. If this model were correct, the expected result would be to get two bands: one corresponding to the density DNI-N¹⁵ and the other corresponding to the density DNI-N¹⁴.
- Bacteria grown in a medium with N¹⁵ and then transferred to a medium with N¹⁴ were finally allowed to replicate twice. Their DNI was extracted and centrifugated. The result was two bands: one of them coincided with the intermediate band, and the other one with the DNI-N¹⁴.
<u>This result was conclusive</u> because if the dispersal model were correct, these two bands should not appear, as all the DNI strands would have part of the original molecule.
With this experiment, Meselson and Stahl proved that the correct replication model was the semi-conservative one.