Nine , significance

With K in the convergence function of Eq. (9.18) equal to 0.4 A-1, the accelerated convergence method reaches an accuracy of nine significant figures with inclusion of only 1000 unit cells. By comparison, about 50,000 unit cells would be required for a summation performed exclusively in direct space. 

Thus, we write the fundamental unit of charge to nine significant figures as 1.602 177 33 x 10"19 C. 

Systematic Errors in Accurate Mass Measurements. 1. Problem Definitions The value of high resolution mass spectrometry is diminished if the mass measurements do not give unambiguous elemental compositions. Accurate mass measurements in FTMS require a precise measurement of ion frequencies and an accurate calibration law for converting ions frequencies to mass. The ion frequencies can be measured to nine significant figures with modern electronics however, the relationship between ion frequencies in the cubic cell and mass still requires further development. 

On the other hand, we were concerned with consistency within our calculations. Thus, we used the same values for atomic masses throughout the calculations. (For Cl and Br, the masses of the most abundant isotopes were used.) Therefore, some of our calculated frequencies do not agree exactly with previously published data. Further, again for consistency, the force fields used were based exclusively on fundamental frequencies even though, in a few cases, data for zero-order frequencies are available. In order to permit replication of our results, the force constants actually used in the calculations are reported to as many as nine significant figures, which is, of course, far beyond the precision justified from present spectroscopic methods. 

Round off the measured number 2,997,215.548 to nine significant digits. 

A fundamental set is also called a smallest set. Usually such a smallest set is selected that it also contains the smallest rings the smallest set of smallest rings (SSSR). This makes chemical sense in indane (Figure 2-38a), for example, where only the six- and the five-membered rings are of chemical significance whereas the enveloping nine-membered ring is not. 

The Westi te 4 1 oop group includes nine plants housed within ici ndenser containments. Ma lese plants havi refueling water storage tanks such that switchover to either is not needed du assumed n time or is significantly delayed. The RCPs are a We.slinghouse design. 

RCRA has been amended nine limes since its initial establishmcnl in 1976. The most significant sets of amendments occurred in 1980, 1984, and 1992. As a result of the Solid llhste Disposal Act Amendments of 1980 ... 

The electrochemical examination of fusion joints between nine pairs of dissimilar metal couples in seawater showed that in most cases the HAZ was anodic to the weld metals" . Prasad Rao and Prasanna Kumarundertook electrochemical studies of austenitic stainless steel claddings to find that heat input and 5Fe content significantly affected the anodic polarisation behaviour under active corrosion conditions whilst Herbsleb and Stoffelo found that two-phased weld claddings of the 24Cr-13Ni type were susceptible to inter-granular attack (IGA) as a result of sensitisation after heat treatment at 600°C /pa was unaffected by heat input. 

The polarizability tensor may therefore be defined by a set of nine components which reduce in number to six because the tensor is symmetric. The physical significance of molecular polarizability is often explained in terms of the polarizability ellipsoid which is defined by the equation ... 

Peptidases have been classified by the MEROPS system since 1993 [2], which has been available viatheMEROPS database since 1996 [3]. The classification is based on sequence and structural similarities. Because peptidases are often multidomain proteins, only the domain directly involved in catalysis, and which beais the active site residues, is used in comparisons. This domain is known as the peptidase unit. Peptidases with statistically significant peptidase unit sequence similarities are included in the same family. To date 186 families of peptidase have been detected. Examples from 86 of these families are known in humans. A family is named from a letter representing the catalytic type ( A for aspartic, G for glutamic, M for metallo, C for cysteine, S for serine and T for threonine) plus a number. Examples of family names are shown in Table 1. There are 53 families of metallopeptidases (24 in human), 14 of aspartic peptidases (three of which are found in human), 62 of cysteine peptidases (19 in human), 42 of serine peptidases (17 in human), four of threonine peptidases (three in human), one of ghitamicpeptidases and nine families for which the catalytic type is unknown (one in human). It should be noted that within a family not all of the members will be peptidases. Usually non-peptidase homologues are a minority and can be easily detected because not all of the active site residues are conserved. 

Remes et al. (1976) also investigated the kinetics of the N-azo coupling of nine a-amino acids. They are aware of earlier investigations in which the major products were pentaz-1,4-dienes, but they claim that under their reaction conditions (pH 8.00-10.25, thirty-fold excess of amino acid) only the triazenes are formed. The rates were found to be first-order with respect to diazonium ion which is consistent with their conclusion however, in the opinion of the present author the results suggest a significant (say, 10%) contribution of pentazdiene formation to the total rate process. No significant correlation was found between the rate constants and the acidity constants of the nine amino acids. 

An interesting and possibly significant aspect of this structure is that each of the four spherons of the inner core has ligancy 9 (its neighbors are the three other inner-core spherons, three of the outer tetrahedron, and another three of the outer layer). Each of these four inner-core spherons with its nine neighbors can be described as forming a KM complex, and the LN core can be described as four interpenetrating KM complexes. 

A rough estimate is that alliances put together without any training will deliver meaningful results for one or both parties in perhaps three out of ten relationships. If the helper is well trained, the success rate rises to around seven out of ten. If the learner is also trained, both parties are likely to record significant benefits in nine out of ten relationships. If third parties are also trained to support the relationship, the success rate may be even higher. 

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