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Reverse-biased PN junction reverse current is of order:
Reverse saturation current is very small (ฮผA range for Si).
Debridement is the removal of necrotic, devitalized, and contaminated tissue from a wound. It is essential for healing because:
- Necrotic tissue acts as a bacterial culture medium
- Devitalized tissue prevents granulation tissue formation
- Dead tissue impairs leukocyte migration (immune function)
Types of debridement:
| Type | Method |
|---|---|
| Surgical/Sharp | Scalpel, scissors โ fastest method |
| Mechanical | Wet-to-dry dressings, wound irrigation, hydrosurgery |
| Autolytic | Occlusive dressings activate body's own enzymes โ slowest, most selective |
| Enzymatic | Collagenase ointment applied topically |
| Biological | Maggot therapy (Larval Debridement Therapy) |
The Soviet Theory of the press emerged from Marxist-Leninist ideology after the 1917 Russian Revolution. Its key features are:
- Closely tied to communist ideology โ media is an instrument of the state/party
- Media functions as a collective agitator, propagandist, and educator in building communism (Lenin's phrase)
- No private ownership of media โ all media belongs to the state or party
- The government is superior to media institutions
- Media is expected to be serious and purposeful
Full editorial autonomy for journalists is a feature of the Libertarian Theory, which is the direct opposite of the Soviet approach. Under Soviet theory, media professionals are instruments of the state's ideological goals โ they have no independent editorial authority. The Soviet Theory does, however, propose a positive role for media: not merely reinforcing authority (as in Authoritarianism), but actively building a new communist society.
\(10 \times 20 = 8 \times d \Rightarrow d = \dfrac{200}{8} = 25\) days
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