21 Result(s)

Chapter and Conference Paper

Optimising Coherence Properties for Phase Contrast X-Ray Imaging (PCXI) to Reveal Airway Surface Liquid (ASL) as an Airway Health Measure

We demonstrate the potential of PCXI in achieving a non-invasive measure of airway health, for the assessment of new therapies for cystic fibrosis (CF). In particular, the advantages to an increased transverse...

K. S. Morgan, D. M. Paganin, D. W. Parsons… in World Congress on Medical Physics and Biom… (2009)

Chapter and Conference Paper

Increasing Preload Reduced Actin-Myosin Interaction in Isolated Beating Rat Whole Heart Under Hypoxia

Background: Hypoxia reduces cardiac contractile performance. However, there is no direct observation on how preload affects the actinmyosin-interaction (AMI) in beating hearts during hypoxia. Purpose: The aim ...

J. Shimizu, T. Miyasaka, Y. Tamura… in World Congress on Medical Physics and Biom… (2009)

Article

A vertebrobasilar junction aneurysm associated with fenestration treated by intra-aneurysmal embolization

Y. Ezaki, K. Kazekawa, K. Tsutsumi, N. Yagi, K. Mori, J. Kawakubo… in Acta Neurochirurgica (2003)

Article

Effects of inorganic phosphate on cross-bridge behavior after photorelease of ATP in permeabilized cells of rat skeletal muscle

Effects of 20 mM inorganic phosphate on the cross-bridge behavior after photorelease of ATP from caged ATP was studied by X-ray diffraction in rat skinned psoas muscle fibers at 16°C. In the first 30 ms after...

N. Yagi, K. Horiuti, S. Takemori in Pflügers Archiv (2002)

Article

Single turnover of cross-bridge ATPase in rat muscle fibers studied by photolysis of caged ATP

A mechanical study on skinned rat psoas muscle fibers was performed at about 16°C with X-ray diffraction and caged-ATP photolysis. The amount of photoreleased ATP was set <0.2 mM for analysis of a `single turn...

K. Horiuti, N. Yagi, S. Takemori in Journal of Muscle Research & Cell Motility (2001)

Article

Structural changes in myosin cross-bridges during shortening of frog skeletal muscle

X-ray diffraction patterns from frog sartorius muscle were recorded during steady shortening with various loads. The intensity of the third meridional reflection from the thick filament decreased on shortening...

N. Yagi, S. Takemori in Journal of Muscle Research & Cell Motility (1995)

Article

X-ray diffraction study on mammalian visceral smooth muscles in resting and activated states

Structural changes of guinea pig taenia coli and rat anococcygeus muscle during contraction were studied by X-ray diffraction. The diffraction pattern of the taenia coli showed the 14.4-nm myosin reflection, t...

M. Watanabe, S. Takemori, N. Yagi in Journal of Muscle Research & Cell Motility (1993)

Chapter

Current X-Ray Diffraction Experiments using a Synchrotron Radiation Source

A Fuji imaging plate and synchrotron radiation are the most distinct innovations of the last twenty years in the X-ray diffraction experiments on biological materials. Here we present results of recent experim...

N. Yagi, S. Takemori, M. Watanabe in Mechanism of Myofilament Sliding in Muscle Contraction (1993)

Article

Effects of N-ethylmaleimide on the structure of skinned frog skeletal muscles

The effects of N-ethylmaleimide (NEM) and other sulfhydryl modifiers on the structure of skinned frog skeletal muscles were studied using the X-ray diffraction technique. In sartorius muscle with full overlap ...

N. Yagi in Journal of Muscle Research & Cell Motility (1992)

Article

Effects of 2,3-butanedione monoxime on contraction of frog skeletal muscles: An X-ray diffraction study

We studied the effects of BDM (2,3-butanedione monoxime) on the tetanic contraction of frog skeletal muscles using an X-ray diffraction technique. BDM significantly increased the resting equatorial intensity r...

N. Yagi, S. Takemori, M. Watanabe, K. Horiuti… in Journal of Muscle Research & Cell Motility (1992)

Article

An X-ray diffraction study ofα-tropomyosin magnesium tactoid

The structure of the needle-shaped aggregate ofα-tropomyosin formed in the presence of Mg²⁺ ions (the Mg-tactoid) was studied by X-ray diffraction. Orientated specimens were prepared by magnetic orientation. The ...

N. Yagi in Journal of Muscle Research & Cell Motility (1988)

Article

Intensification of the 5.9-nm actin layer line in contracting muscle

According to the cross-bridge model^1–3 of muscle contraction, an interaction of myosin heads with interdigitating actin filaments produces tension. Although X-ray equatorial diffraction patterns of active (contra...

I. Matsubara, N. Yagi, H. Miura, M. Ozeki, T. Izumi in Nature (1984)

Chapter

Lateral Shrinkage of the Myofilament Lattice in Chemically Skinned Muscles during Contraction

A toe muscle was isolated from a hind limb of the mouse and treated with saponin to make the sarcolemma more permeable to the solutes of the bathing medium. The equatorial X-ray diffraction pattern was recorde...

I. Matsubara, Y. Umazume, N. Yagi in Contractile Mechanisms in Muscle (1984)

Article

Effects of glycerol on sodium and potassium concentrations in guinea pig perilymph

Blutserum, Liquor cerebrospinalis und Perilymphe von Scala vestibuli und Scala tympani wurden von 85 normalen Meerschweinchen vor und nach i.v. Glycerolapplikation entnommen und die Na- und K-Konzentration bes...

N. Kanoh, N. Yagi, M. Omura, K. Makimoto in Archives of oto-rhino-laryngology (1981)

Article

Movement of myosin heads during a heart beat

X-RAY diffraction studies of heart muscle undergoing cyclic contractions have shown that the myosin heads are transferred from the vicinity of the thick filaments to that of the thin filaments as the muscle pa...

I. MATSUBARA, N. YAGI, M. ENDOH in Nature (1979)

Article

Equatorial X-ray reflections from contracting muscle after an applied stretch

The equatorial X-ray reflections were recorded from contracting muscle after a slow stretch. The intensity ratio of the 1,0 to the 1,1 reflections (I₁₀/I₁₁) after the stretch was not significantly different from ...

N. Yagi, I. Matsubara in Pflügers Archiv (1977)