Space Shuttle Transportation system

Many of the E. coli psi genes function to enhance Pi availability in, and uptake from, the external medium. For example, phosphate starvation induces pho A whose product is alkaline phosphatase, a hydrolytic enzyme that is excreted into the periplasmic space where it acts to cleave extracellular organic P to Pi. A second psi gene system, the phosphate-specific transport (Pst) operon uses energy to transport Pi across the E. coli membrane. The affinity of this four-gene transport system is much greater than that of the constitutive Pi shuttle. Many of these same molecular starvation rescue mechanisms have been characterised in yeast. 

The complexes of the inner mitochondrial membrane that shuttle electrons are called the electron transport system (ETS). After electrons pass through Complex IV, they are donated to oxygen along with protons to form water Figure 15.2b. As electrons move through complexes I, III, and IV of the ETS, protons are "pumped" from the mitochondrial matrix to the intermembrane space. This creates a potential energy source, with a high concentration of protons in the intermembrane space and a relatively low concentration of protons in the mitochondrial matrix. 

The example chosen here is that of inspection of civil aircraft as part of the system for assuring the public that airworthiness is maintained throughout the service life of airframes, avionics, and aircraft structures. It is part of a maintenance process and is typical of many transportation applications, such as for maritime transport, heavy goods vehicles, or even the space shuttle. 

The total driving force for the sedimentation of a particle will not change if (a) the density of the continuous phase is decreased (b) the shape of the particle is changed (c) the system is transported in the space shuttle (d) the density of the particle is increased. 

Space transportation system An integrated sytem consisting of the Space Shuttle (Orbiter, External Tank [ET], Solid Rocket Booster [SRB], and flight kits), upper stages, Spacelab, and any associated flight hardware and... 

The Composites for Advanced Space Transportation Systems (CASTS) program at NASA-Langley is directed towards the development of technology to reduce the structural weight of vehicles such as the space shuttle, through the use of high-temperature composite materials. At present, commercially available adhesives do not meet all of the requirements for these programs. ... 

Jenkins, Dennis R. Space Shuttle The History of the National Space Transportation System—The First One Hundred Missions. 3d ed. Dennis R. Jenkins, 2001. A history of the space shuttle from a spacecraft-design perspective. Detailed schematic diagrams and voluminous photos of construction, maintenance, and operation of the shuttle reveal much about the art of manned spacecraft engineering. Mishkin, Andrew. Sojourner An Insider s View of the Mars Pathfinder Mission. New York Berkeley Books, 2003. The author is a senior systems engineer for NASA. His book is a personal glimpse of spacecraft engineering and operations. 

Jenkins, Dennis R. Space Shuttle The History of the National Space Transportation System The First 100 Missions. Stillwater, Minn. Voyageur Press, 2001. 

The Space Transportation System (STS) - the space shuttle - consists of an airplanelike orbiter, two solid rocket boosters (SRBs) on either side, and a large cylindrical external tank that holds ciyogenic fuel for the orbiter s main engines. The SRBs detach from the orbiter 2.5 minutes after launch, fall into the ocean, and are recovered for reuse. The external tank is not reused. It is jettisoned as the orbiter reaches Earth orbit, and disintegrates as it falls into the Indian Ocean (Smith, 2003). 

Space Transportation System (STS), 12 see also Challenger Columbia space shuttle program speciahzation, 180 2... 

Most of the NADH used in electron transport is produced in the mitochondrial matrix space, an appropriate site because NADH is oxidized by Complex I on the matrix side of the inner membrane. Furthermore, the inner mitochondrial membrane is impermeable to NADH. Recall, however, that NADH is produced in glycolysis by glyceraldehyde-3-P dehydrogenase in the cytosol. If this NADH were not oxidized to regenerate NAD, the glycolytic pathway would cease to function due to NAD limitation. Eukaryotic cells have a number of shuttle systems that harvest the electrons of cytosolic NADH for delivery to mitochondria without actually transporting NADH across the inner membrane (Figures 21.33 and 21.34). 

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