Soybean (Glycine max cv. Bragg) petiolar tissue containing translocated (14)C-sucrose was quick frozen, freeze-substituted in acetone or propylene oxide and embedded in Epon. This procedure allowed cytological observations on sieve elements whose functional condition could be verified by microautoradiography. Sieve elements and companion cells were essentially free of ice damage. Aside from a P...

Visual cryptography encodes a secret image into n shares which are distributed to n participants. Pixel Sieve method was proposed recently to encode an image into shares, but the encryption quality is poor. In this paper an improved version of pixel sieve method is proposed to achieve more security then existing pixel sieve method. Based on cross merge and key shifting schemes, the proposed met...

We describe Sieve, a prototype Java-based collaborative environment for constructing visualizations interactively. Sieve allows collaborative construction of data-flow networks from an extensible set of modules. Modules may read data from a variety of sources, filter and transform the data in various ways, and generate visualizations. Annotation tools are also provided for mark-up and documenta...

In the sieve theories of Rosser-Iwaniec and Diamond-Halberstam-Richert, the upper and lower bound sieve functions (F and f, respectively) satisfy a coupled system of diierential-diierence equations with retarded arguments. To aid in the study of these functions, Iwaniec introduced a conjugate diierence-diierential equation with an advanced argument, and gave a solution, q, which is analytic in ...

A principal limitation in accuracy for scientific computation performed with floatingpoint arithmetic may be traced to the computation of repeated sums, such as those which arise in inner products. As previously reported, a systolic super summer is a cellular piece of hardware for the summation of floating-point numbers. The apparatus receives floating-point summands, converting them into a fix...

The amino acid composition of endosperm cavity sap and of sieve tube saps from the flag leaf, peduncle, rachis, grain pedicel, and grain were determined for wheat plants just past the mid-half of grain filling. On a mole percent basis, glutamine accounted for almost half of the amino acids in sieve tube sap from the peduncle and ear. Other protein amino acids, plug gamma-aminobutyrate, were pre...

4 Colour connected filters 11 4.1 Colour area morphology scale-spaces . . . . . . . . . . . . . . . . . . . . . . . . 12 4.1.1 Colour Extrema . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 4.1.2 Distance metrics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 4.2 Convex Colour Sieve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 4.3 Vecto...

E. Bombieri [12] has written at length concerning applications of the large sieve to number theory. Our intent here is to complement his exposition by devoting our attention to the analytic principle of the large sieve; we describe only briefly how applications to number theory are made. The large sieve was studied intensively during the decade 1965-1975, with the result that the subject has lo...

A method was designed for in vivo observation of sieve element/companion complexes by using confocal laser scanning microscopy. A leaf attached to an intact fava bean plant was mounted upside down on the stage of a confocal microscope. Two shallow paradermal cortical cuts were made in the major vein. The basal cortical window allowed us to observe the phloem intact. The apical window at 3 cm fr...