Flexibility also

The larger the gear unit, the more important this eheek beeomes, sinee large housings tend to be more flexible. Also, the use of baseplates furnished by the original equipment manufaeturer does not eliminate faee eontaet problems, and these inspeetion proeedures should be earried out. 

The sections to follow provide overviews of the more common coupling types rigid and flexible. Also discussed are couplings used for special applications floating-shaft (spacer) and fluid (hydraulic). 

While most CA s of disaccharides have depended only on intrinsic characteristics of the molecule, experimental results depend strongly on the environment. By experiment, Kamide and Saito ( ) have shown that the degree of flexibility of cellulose and its derivatives is strongly dependent on the dielectric constant of the solvent as well as the exact type and degree of substitution. Since a substantial portion of the polymer flexibility depends on the extent of variability of the torsion angles at the intermonomer linkage, the dependence of polymer flexibility on type of solvent and substitution means that the disaccharide flexibility also should depend on those factors. Non-polar solvents allowed the molecules to have greater flexibility than did polar solvents (35). 

METEOR S biotransformation rules are generic reaction descriptors, and the versatile structural representation used in the system allows each atom or bond to have specific physicochemical properties. This approach provides more details than simple hard-coded functional group descriptors (313), but this flexibility also can give rise to an avalanche of data. METEOR manages the amount of data by predicting which metabolites are to be formed rather than all the possible outcomes (310,312,314,315). At high certainty levels, when chosen, only the more likely biotransformations are requested. At lower likelihood levels, the more common metabolites are also selected for examination. Currently, METEOR knowledge-based biotransformations are exclusively for mammalian biotransformations (phase I and phase II) (314,315). 

Chain flexibility also effects the ability of a polymer to crystallize. Excessive flexibility in a polymer chain as in polysiloxanes and natural rubber leads to an inability of the chains to pack. The chain conformations required for packing cannot be maintained because of the high flexibility of the chains. The flexibility in the cases of the polysiloxanes and natural rubber is due to the bulky Si—O and rxv-olelin groups, respectively. Such polymers remain as almost completely amorphous materials, which, however, show the important property of elastic behavior. 

PMA is a tough leathery resin with a low Tg and a solubility parameter of 10.5 H. In polymers of alkyl acrylates the solubility parameter decreases as the size of the alkyl group increases. The flexibility also increases with the size of the pendant groups but because of side chain crystallization this tendency is reversed when the alkyl group has more than ten carbon atoms. Polyalkyi acrylates are readily hydrolyzed by alkalis to produce salts of polyacrylic acid. The copolymer of ethyl acrylate (95%) and chloroethyl vinyl ether (5%) is a commercial oil-resistant elastomer. 

They are atactic amorphous polymers which have good light transparency (92%) and yield transparent moldings and films. As was noted for polyalkyl acrylates, the solubility parameters decrease as the size of the alkyl groups increases. The flexibility also increases as one goes from polymethyl methacrylate (PMMA) to polyaryl methacrylate and then decreases as the size of the alkyl group is further increased. 

Thin-film, also known as amorphous, can offer advantages in some installations, such as rooftops, because it is lighter in weight. It is somewhat flexible. Also, thin-film can be less expensive to manufacture. 

Macromolecules display continuous motions. These motions can be of two main types the molecule can rotate on itself, following the precise axis of rotation, and it can have a local flexibility. Local flexibility, also called internal motions, allows different small molecules, such as solvent molecules, to diffuse along the macromolecule. This diffusion is generally dependent on the importance of the local internal dynamics. Also, the fact that solvent molecules can reach the interior hydrophobic core of macromolecules such as proteins clearly means that the term hydrophobicity should be considered as relative and not as absolute. Internal dynamics of proteins allow and facilitate a permanent contact between protein core and the solvent. Also, this internal motion permits small molecules such as oxygen to diffuse within the protein core. Since oxygen is a collisional quencher, analyzing the fluorescence data in the presence of different oxygen concentrations yields information on the internal dynamics of macromolecules. 

This separation is necessary for energetic reasons, as will be evident in subsequent chapters. It also facilitates the control of metabolism. In eukaryotes, metabolic regulation and flexibility also are enhanced by compartmentalization. For example, fatty acid oxidation takes place in mitochondria, whereas fatty acid synthesis takes place in the cytosol. 

When the Co-C bond is broken in the adenosyl coenzyme, the adenosyl group must move and transfer the free radical to the substrate site that is probably not directly on the cobalt atom. This analysis of corrin ring flexibility also included information on the accessibility of various portions of the molecule. Such steric accessibility indicates the availability of that part of the molecule to attack by other molecules. Random points (50 points per A , for example) were generated around each atom at its van der Waals radius. If any of these points around an atom was within the van der Waals radius of another atom in the structure, the... 

Inherent chain flexibility also manifested itself quite strongly in a decrease of polymer inherent viscosity with increased m-phenylene content for a series of copolymers prepared... 

Process flexibility, also called mix flexibility, is the ability to absorb changes in the product mix by performing similar operations or producing similar produces or parts on multipurpose, adaptable CNC machining centers. 

Chain flexibility also affects the crystalhzabihty of a polymer. Excessive flexibility in a polymer chain, as in natural rubber and polysiloxanes, gives rise to difficulty in chain packing, with the result that such polymers remain almost completely in the amorphous state. In the other extreme, excessive rigidity in polymers due to extensive cross-hnking, as in thermosetting resins like phenol-formaldehyde and urea—formaldehyde, also results in an inabihty to crystallize. 

The reasons to start in elementary school are primarily psychological. Kids are curious, have no preconceived ideas about the subject and their attitudes are still quite flexible. Also most teachers are happy to include special programs and their schedules are easier to interrupt than in higher grades. Simple, safe demonstrations are available which easily fit into the elementary science curriculum. 

---