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Filaments with a diameter of 80-120 A have been prepared from 14-d-old chick embryonic skeletal muscle, using a physiological salt solution and gel filtration chromatography. The filaments obtained are composed of the two known muscle intermediate-filament proteins, vimentin and desmin, as well as the vimentin- and desmin-associated high molecular weight(More)
Myosins are cytoskeletal motors critical for generating the forces necessary for establishing cell structure and mediating actin-dependent cell motility. In each cell type a multitude of myosins are expressed, each myosin contributing to aspects of morphogenesis, transport, or motility occurring in that cell type. To examine the roles of myosins in(More)
Several forms of sensory deficit have been associated with unconventional myosin defects in humans and other animals. Normal hearing in mammals has been shown to require functional myosin VI (Avraham et al., 1995) and myosin VIIA (Gibson et al., 1995; Liu et al., 1997), and the combined blindness and deafness of Usher syndrome type IB has been shown to be(More)
Mice lacking the gene encoding for the intermediate filament protein desmin have a surprisingly normal myofibrillar organization in skeletal muscle fibers, although myopathy develops in highly used muscles. In the present study we examined how synemin, paranemin, and plectin, three key cytoskeletal proteins related to desmin, are organized in normal and(More)
This article describes a new hands-on, or "kinesthetic," activity for use in a physiology lecture hall to help students comprehend an important concept in cardiopulmonary physiology known as oxygen carrying capacity. One impetus for designing this activity was to address the needs of students who have a preference for kinesthetic learning and to help(More)
Biology students enrolled in a typical undergraduate physiology course encounter Poiseuille's law, a physics equation that describes the properties governing the flow of blood through the circulation. According to the equation, a small change in vessel radius has an exponential effect on resistance, resulting in a larger than expected change in blood flow.(More)
The myosin ATPase activity and myosin light chain composition in developing chick heart and skeletal muscles were studied and compared. Embryonic myosin was purified and characterized from day 7 to day 19 of embryogenesis. Embryonic cardiac myosin generally showed the same Ca2+-activated myosin ATPase activity level as the adult value. In comparison, pooled(More)
PURPOSE Myosin-I is a nonfilamentous motor protein associated with the actin cytoskeleton and cellular membranes in several cell types. The occurrence and subcellular distribution of myosin-I in mammalian and fish RPE were investigated to examine the possible role of myosin-I in retinal pigment epithelium (RPE) motility processes. METHODS Antibodies(More)
Breckler J, Yu JR. Student responses to a hands-on kinesthetic lecture activity for learning about the oxygen carrying capacity of blood. article describes a new hands-on, or " kinesthetic, " activity for use in a physiology lecture hall to help students comprehend an important concept in cardiopulmonary physiology known as oxygen carrying capacity. One(More)
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