String expression

Edgar That is another great question that we don t know much about. All I can tell you is about that one experiment I mentioned in which a minigene with just a basal promoter can give low-level ubiquitous string expression and enough cell division to generate a fly. 

Eehner In the epidermis it is quite reproducible. After mitosis 13, when the syncytial division cycle is stopped, cellularization occurs followed by a pulse of string expression that allows cells to go through mitosis 14. Then they go immediately into S phase and wait in the next G2 phase until the next pulse of string comes up, driving mitosis 15. After mitosis 15, they go again immediately into S phase and wait in G2 until string comes up, triggering the final division. 

An aggregate expression constructs an array from scalar t5 es. A string expression may use objects of a composite type or explicitly specify the value to be stored in the array The common way to express a binary value is to use a siring literal viz. ... 

There are many different types of expressions in VBA. Among these are numerical, logical (Boolean), and character string expressions. 

Wiswesser line notation The Wiswesser line-formula notation (WLN) is a method for expressing the more usual graphical structure of a chemical compound as a linear string of symbols. The resulting alternative notation is unambiguous, short and particularly suitable for computer processing and retrieval but can also be understood easily by chemists after minimal training in its use. 

In the earliest days of on-line databases, all three indexing types coUapsed into the third. Using older manual tools, it was difficult to coordinate more than two or three concepts, but the computer made that easier. Each concept in a search can be represented by a string of synonyms or alternatives, and searching can be done for two such parameters or more. Thus, Boolean logic expressions can easily be constmcted as follows ... 

Generalizing the second observation to cycles of arbitrary length, we note that since each primitive string in a limit cycle with least period equal to q must be a fixed point of the g order rule, (and thus also a fixed point of [4>Y, for any period p with q p), each primitive limit cycle may be expressed by a term equal to its period ... 

Consider an arbitrary set of Boolean input values, Xi,..., Xn- Using only the Boolean operators AND and NOT, we can write down an expre.ssion which takes the value 1 if and only if a particular configuration of O s and I s appears in the input. Suppose that n = 6 and we want to construct an expression that equals one if and only if xi = X3 = X4 = X5 = 1 and. X2 = xe = 0. A little thought will show that the required expression is given by joining the string of six Boolean variables with the AND operator, substituting NOT(xi) for all values x)i that are required to equal zero ... 

The quantity c = y/rjp is known as the jjjia e velocity, It is the speed a which waves travel along the string. Clearly, the left-hand side of Eq, (4) represents the one-dimensional Laplacian operating on the dependent variable. This expression can be easily generalized to represent wave phenomena in two or more dimensions in space. 

Apply the initial conditions for the strode string (ii) to obtain the expression for... 

The cell doubling times go from less than 8 h to more than 18 h. Cells are also accumulating in G2. This is coincident with the gradual transition of String from a ubiquitously expressed product to a periodically expressed product. This transition can be largely attributed to regulation of String. 

Edgar We have done this experiment, overexpressing Myc or Ras co-expressed with String. This decreases the cell doubling time and reduces the cell size, but the... 

R ichardson As with String, cyclin E appears to be regulated by developmental signals in particular tissues (L. Jones, H. Richardson R. Saint, unpublished results). The only place where it is really responding to E2F is in the embryonic gut and other endoreplicating tissues (Duronio O Farrell 1995). In other tissues there might be tissue-specific factors that are controlling its expression. 

Eehner We haven t done these experiments. But we have looked in string mutants where cells arrest in G2 before mitosis 14 and in cyclinAl cyclinB double mutants where cells arrest in G2 before mitosis 15. The timing of dacapo expression in the epidermis appears to be normal in these mutants. 

In early work, GA strings were binary coded. Computer scientists are comfortable with binary representations and the problems tackled at that time could be easily expressed using this type of coding. Binary coding is sometimes appropriate in scientific applications, but it is less easy to interpret than alternative forms, as most scientific problems are naturally expressed using real numbers. 

Do not worry," Charmatz said. "We ll pull every string we can." He was very pleased at using one of the few slang expressions he knew. 

The concept of potential energy in mechanics is one example of a scalar field, defined by a simple number that represents a single function of space and time. Other examples include the displacement of a string or a membrane from equilibrium the density, pressure and temperature of a fluid electromagnetic, electrochemical, gravitational and chemical potentials. All of these fields have the property of invariance under a transformation of space coordinates. The numerical value of the field at a point is the same, no matter how or in what form the coordinates of the point are expressed. 

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