By a limited proteolysis with thermolysin, rye seed chitinase-a (RSC-a) was separated into a N-terminal c}'steine-rich chitin-binding (CB-) domain (48 residues) and a cata])'tic (Cat-) domain (254 residues). The h)'drolytic activity of the isolated Cat-domain toward sotuble glycolchitin, was similar to that of RSC-a, but that toward insolub]e cot]oidal chitin was 28'M, of that of RSC-a. Five di...

The importance of caterpillar trees in the topological theory of benzenoid systems lies in the following. Let B be a non-branched cata-condensed benzenoid hydrocarbon (that is a hydrocarbon containing linearly and angularly condensed rings). If we associate a symbol L to each linearly condensed ring (and also to the two terminal ones) and a symbol A to each angularly condensed ring, then the so...

A model on indexing for information retrieval is presented in this paper. As a way to reduce the limitations over relevant functions, we propose an architecture which incorporates multilevel functional decomposition to ascribe the documents based on users' concept spaces. The higher level can obtain taxonomies for documents based on cata-loguers' Boolean indexing opinions. The lower level will ...

Objetivou-se avaliar os aspectos de qualidade sensorial madeiras endêmicas da Caatinga, a fim compreender como as pessoas se relacionam com elas e entender características sensoriais desejadas pelos consumidores que possam auxiliar na valorização das espécies. Madeiras utilizadas em movelarias serrarias Aruaru, Morada Nova–CE (‘pau-branco claro’, ‘pau-branco rajado’, ‘cumaru’, ‘pereiro’, ‘pau-d...

An algorithm for the calculation of the hyper-Wiener index (WW) of benzenoid hydrocarbons (both cata- and pericondensed) is described, based on the consideration of pairs of elementary cuts of the corresponding benzenoid graph B. A pair of elementary cuts partitions the vertices of B into four classes. WW is expressed as a sum of terms of the form n11n22 + n12n21, each associated with a pair of...

The electronic structure of a hexa-cata-hexabenzocoronene (HBC)/ Cu(111) interface is investigated by two-photon photoemission over a range of coverage from 0 to 2 ML monolayers. It is found that increasing the HBC coverage shifts the vacuum level of the Cu substrate until this shift saturates at a coverage of ∼2 ML. Over this same range of coverage, the Shockley and the bare-surface Cu(111) im...

We try to combine the ‘syntactic composition of tree transducers’ [FV98, KV01] on the one hand side and ‘short cut fusion’ [GLP93] on the other hand side. Short cut fusion is based on the ‘cata/build-rule’ [Joh01] or ‘acid rain theorem’ [TM95]. Therefore it is necessary to represent the recursive functions as catamorphisms. A catamorphism is a generalization of the well known list-function fold...