55011

Mefloquine is effective against malaria because it inhibits the DNA replication in the parasites' asexual erythrocytic stages, thus preventing their proliferation.

19764

In X-linked dominant inheritance, an affected father passes the X-linked trait to all of his daughters but none of his sons. [Image of X-linked dominant inheritance pattern]

18680

Streptomycin is considered a narrow-spectrum antibiotic, primarily effective against Gram-negative bacteria and Mycobacterium tuberculosis. Ampicillin, chloramphenicol, and tetracycline are all classified as broad-spectrum antibiotics because they are effective against a wide range of both Gram-positive and Gram-negative bacteria.

68814

The conversion of 7-dehydrocholesterol to cholecalciferol (vitamin D3) in the skin is initiated by the action of UVB light from sunlight, not by any specific hormone.

47668

The wrong statement about obturation is that silver cones are recommended for canals in which posts are placed. Actually: 1) Silver cones ARE recommended for fine tortuous canals where gutta-percha placement is difficult, 2) McSpadden compactors DO operate at 6000-10,000 rpm, 3) Silver cones are NOT recommended for post preparation because they are difficult to remove and can corrode, 4) Gutta-percha is preferred for post cases as it can be easily sectioned and removed. Silver cones create problems during post preparation due to their metallic nature and removal difficulty.

56760

Lacrimation during mastication, often referred to as Bogorad/s syndrome or "crocodile tears," is caused by aberrant regeneration of the auriculotemporal nerve after injury, usually due to trauma or surgery involving the parotid gland. The regenerated parasympathetic fibers intended for the parotid gland mistakenly innervate the lacrimal gland, leading to tearing instead of salivation upon eating.

61320

63951

Vitamin E (tocopherol) is the most important antioxidant in the body, acting in the lipid phase of membranes to protect against oxidative damage.

36350

Down syndrome is characterized by large anterior fontanelles that close late, open sutures, slanting palpebral fissures (mongoloid), decreased sexual development due to hypogonadism, macroglossia (enlarged tongue), and enamel hypoplasia leading to increased caries susceptibility. These features are pathognomonic of trisomy 21. Other syndromes do not present with this specific constellation of findings.

77536

Hypochlorite solutions, such as household bleach (sodium hypochlorite), are widely used in laboratories as effective and inexpensive disinfectants.
They are effective against a broad range of microorganisms, including bacteria, viruses, and fungi.