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  2. Gemination - Wikipedia

    en.wikipedia.org/wiki/Gemination

    In some languages, like Italian, Swedish, Faroese, Icelandic, and Luganda, consonant length and vowel length depend on each other. A short vowel within a stressed syllable almost always precedes a long consonant or a consonant cluster, and a long vowel must be followed by a short consonant.

  3. Length (phonetics) - Wikipedia

    en.wikipedia.org/wiki/Length_(phonetics)

    Also, tonal contour may reinforce the length, as in Estonian, where the over-long length is concomitant with a tonal variation resembling tonal stress marking. In transcription in the International Phonetic Alphabet , long vowels or consonants are notated with the length sign (ː Unicode U+02D0 MODIFIER LETTER TRIANGULAR COLON) after the letter.

  4. Confocal microscopy - Wikipedia

    en.wikipedia.org/wiki/Confocal_microscopy

    Fluorescence and confocal microscopes operating principle. Confocal microscopy, most frequently confocal laser scanning microscopy (CLSM) or laser scanning confocal microscopy (LSCM), is an optical imaging technique for increasing optical resolution and contrast of a micrograph by means of using a spatial pinhole to block out-of-focus light in image formation. [1]

  5. Fluorescence microscope - Wikipedia

    en.wikipedia.org/wiki/Fluorescence_microscope

    In 1978 first theoretical ideas have been developed to break this barrier by using a 4Pi microscope as a confocal laser scanning fluorescence microscope where the light is focused ideally from all sides to a common focus which is used to scan the object by 'point-by-point' excitation combined with 'point-by-point' detection. [9]

  6. Focal length - Wikipedia

    en.wikipedia.org/wiki/Focal_length

    The focal point F and focal length f of a positive (convex) lens, a negative (concave) lens, a concave mirror, and a convex mirror.. The focal length of an optical system is a measure of how strongly the system converges or diverges light; it is the inverse of the system's optical power.

  7. Fortis and lenis - Wikipedia

    en.wikipedia.org/wiki/Fortis_and_lenis

    Fortis stops in Australian Aboriginal languages such as Rembarunga (see Ngalakgan) also involve length, with short consonants having weak contact and intermittent voicing, and long consonants having full closure, a more powerful release burst, and no voicing. It is not clear if strength makes the consonants long, or if during long consonants ...