A large birefringence signal preceding contraction in single twitch fibres of the frog.
نویسندگان
چکیده
منابع مشابه
A Comparison of the Fine Structures of Frog Slow and Twitch Muscle Fibres
The organisation of the myofibrils and the sarcoplasmic reticulum in frog slow muscle fibres has been compared with that in twitch fibres. It has been found that the filaments have the same length in the two types of fibre, but that there are differences in their packing: (a) in contrast to the regular arrangement of the I filaments near the Z line in twitch fibres, those in slow fibres are irr...
متن کاملBackscattering Measurement of Bending - Induced Birefringence in Single Mode Fibres
core were investigated. It was shown from the measurement that the beat length was about L = 23 mm (birefringence B = 5 x 10") and the state of linear polarisation of the incident light beam was maintained up to 0-6 kg/cm of the concentrated force when the incident plane of polarisation was coincident with the major axis of the fibre. It was also shown that the degree and the plane of polarisat...
متن کاملAlteration of the voltage-dependence of the twitch tension in frog skeletal muscle fibres by a polyether, Bistramide A.
Bistramide A, a toxin isolated from Lissoclinum bistratum Sluiter, was applied to frog skeletal muscle fibres. Micromolar concentrations of toxin decreased the amplitude of the twitch tension. Bistramide A shifted the activation and the steady-state inactivation characteristics of the tension on the voltage axis towards more positive and negative membrane potentials respectively. The data sugge...
متن کاملComparison of myoplasmic calcium movements during excitation–contraction coupling in frog twitch and mouse fast-twitch muscle fibers
Single twitch fibers from frog leg muscles were isolated by dissection and micro-injected with furaptra, a rapidly responding fluorescent Ca(2+) indicator. Indicator resting fluorescence (FR) and the change evoked by an action potential (ΔF) were measured at long sarcomere length (16°C); ΔF/FR was scaled to units of ΔfCaD, the change in fraction of the indicator in the Ca(2+)-bound form. ΔfCaD ...
متن کاملa swot analysis of the english program of a bilingual school in iran
با توجه به جایگاه زبان انگلیسی به عنوان زبانی بین المللی و با در نظر گرفتن این واقعیت که دولت ها و مسئولان آموزش و پرورش در سراسر جهان در حال حاضر احساس نیاز به ایجاد موقعیتی برای کودکان جهت یاد گیری زبان انگلیسی درسنین پایین در مدارس دو زبانه می کنند، تحقیق حاضر با استفاده از مدل swot (قوت ها، ضعف ها، فرصتها و تهدیدها) سعی در ارزیابی مدرسه ای دو زبانه در ایران را دارد. جهت انجام این تحقیق در م...
15 صفحه اولذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: The Journal of Physiology
سال: 1977
ISSN: 0022-3751
DOI: 10.1113/jphysiol.1977.sp011661