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  2. Respiratory tract antimicrobial defense system - Wikipedia

    en.wikipedia.org/wiki/Respiratory_tract...

    In the first line of defense, inhaled bacteria are trapped by mucus and are swept toward the pharynx and are swallowed. [1] Bacteria which penetrate the mucous layer are dealt with a second line of defense which includes antimicrobial peptides that are secreted by the surface epithelium of the respiratory tract which kill many strains of ...

  3. Two-level defense - Wikipedia

    en.wikipedia.org/wiki/Two-level_defense

    A two-level defense does away with the contain unit in favor of increased pressure on the offense. Two-level defenses will often use one deep safety (as deep as 28 yards at the snap) to enforce an end line on the offense, but the Bear 4-6 is a two level defense with contain handled solely by the single coverage skills of the cornerbacks. The ...

  4. Defence in depth - Wikipedia

    en.wikipedia.org/wiki/Defence_in_depth

    Defence in depth (also known as deep defence or elastic defence) is a military strategy that seeks to delay rather than prevent the advance of an attacker, buying time and causing additional casualties by yielding space. Rather than defeating an attacker with a single, strong defensive line, defence in depth relies on the tendency of an attack ...

  5. Acid–base homeostasis - Wikipedia

    en.wikipedia.org/wiki/Acid–base_homeostasis

    The second and third lines of defense operate by making changes to the buffers, each of which consists of two components: a weak acid and its conjugate base. [5] [13] It is the ratio concentration of the weak acid to its conjugate base that determines the pH of the solution. [14]

  6. Interior lines - Wikipedia

    en.wikipedia.org/wiki/Interior_lines

    Interior lines [a] (as opposed to exterior lines) is a military term, derived from the generic term line of operation or line of movement. [1] The term "interior lines" is commonly used to illustrate, describe, and analyze the various possible routes (lines) of logistics, supply, recon, approach, attack, evasion, maneuver, or retreat of armed forces.

  7. Dragon's teeth (fortification) - Wikipedia

    en.wikipedia.org/wiki/Dragon's_teeth_(fortification)

    Russian anti-tank obstacles near the horizon, Kherson Oblast, May 2022. Dragon's teeth on the left, Czech hedgehogs on the right In Belgorod Oblast, defensive lines of dragon's teeth were constructed in October 2022 under the supervision of the Wagner Group along the Russia–Ukraine border, intended as a second line of defense alongside trenches and a trained militia in the event the ...

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  9. Fortifications of the Russian invasion of Ukraine - Wikipedia

    en.wikipedia.org/wiki/Fortifications_of_the...

    [25] [26] According to the Russian media, it is a second line of defence in case the Ukrainian armed forces try to penetrate the area. [27] [28] In a report dated 21 November 2022, the British Ministry of Defence considered that Moscow prioritized the construction of defensive positions on the Svatove–Kreminna line. [29]