Sieve deposits were once considered to be one of the building blocks in alluvial fan stratigraphy. Later re-interpretation of sieve lobes as debris-flow deposits, favored because no visual records of active sieve deposition ...

The ultrastructural features and the plastid changes caused by sample preparation were studied in sieve elements of Panicum maximum leaves. Samples of expanded leaves, taken near the ligule region, were fixed and processed ...

The ultrastructural features and the plastid changes caused by sample preparation were studied in sieve elements of Panicum maximum leaves. Samples of expanded leaves, taken near the ligule region, were fixed and processed ...

We show that if a big set of integer points S ⊆ [0, N] d, d > 1, occupies few residue classes mod p for many primes p, then it must essentially lie in the solution set of some polynomial equation of low degree. This answers ...

Mature leaf fragments from eight species of Xyris from the Serra do Cipo, State of Minas Gerais, Brazil, were prepared by the usual methods for electron microscopy. Ultrastructural analysis of phloem shows the occurrence ...

Mature leaf fragments from eight species of Xyris from the Serra do Cipo, State of Minas Gerais, Brazil, were prepared by the usual methods for electron microscopy. Ultrastructural analysis of phloem shows the occurrence ...

Sieved orthogonal polynomials on the unit circle were introduced independently by Ismail and Li (1992) [15] and Marcellan and Sansigre (1991) [19]. We look at the para-orthogonal polynomials, chain sequences and quadrature ...