experiment k-6-09. morphological and biochemical investigation of microgravity-induced nerve and muscle breakdown. part 1: investigation of nerve and muscle breakdown during spaceflight; part 2: biochemical analysis of edl and plt muscles

the present findings on rat hindlimb muscles suggest that skeletal muscle weakness induced by prolonged spaceflight can result from a combination of muscle fiber atrophy, muscle fiber segmental necrosis, degeneration of motor nerve terminals and destruction of microcirculatory vessels. damage was confined to the red adductor longus (al) a..

diamond turning of optical crystals

diamond turning (dt) has proven to be a cost effective optical fabrication technique for both aspherical and spherical/flat figures when precise geometrical tolerances are important. we are interested in the dt of crystals for several reasons. dt has been very effective to insure requisite accurate geometrical orientation of optical surfa..

beryllium fabrication/cost assessment for iter

a fabrication and cost estimate of three possible beryllium shapes for the international thermonuclear experimental reactor (iter) blanket is presented. the fabrication method by hot pressing (hp), cold isostatic pressing plus sintering (cip+s), cold isostatic pressing plus sintering plus hot isostatic pressing (cip+s+hip), and sphere pro..

fraesen von faserverbundwerkstoffen. abschlussbericht. (milling of fiber composites. final report)

as the documented investigations show, the fibre material and its fibre orientation have a decisive influence on the result of machining operations for finishing fibre composites by milling because of their predominantly negative cutting angles and narrow cutting spaces, tools with geometrically undefined cutting edges can advantageously ..

lapping: polishing and shear mode grinding. revision 1

it is the thesis of this paper that shear mode grinding (smg), (ductile grinding, nanogrinding, fractureless grinding) is just a particular form of polishing. it may be unique in that it can involve a hard wheel of very precise dimensions compared to the soft laps usually used in polishing. such a wheel would permit the fabrication of a p..

cosmos 2044. final report

the effects of microgravity and hind limb suspension on the enzyme patterns are assessed within a slow twitch muscle (soleus) and a fast twitch muscle (tibialis anterior). studies were made on 95 soleus fibers and about 300 tibialis anterior (ta) fibers. over 2200 individual enzyme measurements were made. six key metabolic enzymes (hexoki..

bulletin of research institute for polymers and textiles, no. 163, 1990-9

contents: trial model for three-dimensional woven fabrics by braiding system; the development of automated loom for weaving a three-dimensional fabric; influence of the structure of three dimensional fabrics on the mechanical properties of their epoxy composites; fabrication of hybrid three-dimensional fabric composites and their mechanic..

bulletin of research institute for polymers and textiles, no. 162, 1990-3

contents: development and clinical application of an integral module for plasma perfusion; large-scale production process of polyoxymethylene whisker; design of continuous membrane column for separating solute components; separation of rare metals by ion exchange fibers; immunosorbent consisting of dna immobilized on sepharose; reaction e..

ventilation loss and pressurization in the nasa launch/entry suit: potential for heat stress. final rept. 1 aug-15 sep 89

the potential of the national aeronautics and space administration launch/entry suit (les) for producing heat stress in a simulated space shuttle cabin environment has been studied. the testing was designed to identify potential heat stress hazards if the les were pressurized or if ventilation were lost. conditions were designed to simula..

biotechnology symposium. final rept. 15 jul 89-14 jan 90

contents: biotechnology for aerospace materials; components and structure of insect exoskeleton compared to man-made advanced composites; long-term behavior of biomedical composites; biocomposites with variable controllable properties; whale blubber as a structural material; design of a composite hip prothesis. (edc)