Die Actomyosinstruktur im glatten Muskel der Vertebraten

✍ Scribed by D. Seidel; Hans H. Weber

• Publisher: Springer
• Year: 1967
• Tongue: English
• Weight: 524 KB
• Volume: 297
• Category: Article
• ISSN: 0031-6768
• DOI: 10.1007/bf00386102

✦ Synopsis

It is composed of intrinsic and form (rod) birefringence.

2. The intrinsic birefringence is N 1.4 × 10 -4 under physiological conditions of swelling. The intrinsic birefringence is not produced by the structures of actomyosin. This is an argument that myosin-filaments containing a rather large number of closely packed molecules do not exist in vertebrate smooth muscles.

3. The form birefringence ia the physiological state of swelling is about 5.5 × 10 -~. The form birefringence is also not or only to a very ismall amount produced by actomyosin structures. Therefore it remains an open question whether the myosin elements (single molecules or extremly thin filaments) lie parallel to the axis of the muscle cells.

4. The unknown protein structures producing intrinsic birefringence and form birefringence are not identical.