H. Beker - Academia.edu (original) (raw)

Papers by H. Beker

Phytotaxa

Hebeloma radicosum, known for its long ‘root’ and membranous ring, has regularly been recorded in... more Hebeloma radicosum, known for its long ‘root’ and membranous ring, has regularly been recorded in Japan and been the subject of many studies revolving around ectomycorrhizal fungi exposed to high levels of nitrogen compounds and tripartite associations between fungi, host trees and mammals, including moles, wood mice and shrews. However, the species recorded in Japan is in fact not H. radicosum but a closely related species, also in Hebeloma section Myxocybe, described here as Hebeloma sagarae. This mushroom is macroscopically very similar to Hebeloma radicosum, also with a long ‘root’ and membranous ring, but distinct molecularly and in its distribution. We also examine other ‘rooting’ Hebeloma species from Japan: H. luchuense and H. radicosoides; both are shown to be members of H. sect. Scabrispora. A fourth ‘rooting’ Hebeloma from Japan is shown to be the same as or a close relative of Hebeloma danicum originally described from Europe.

Plant Ecology and Evolution

Background and aims – The genus Hebelomina was established in 1935 by Maire to accommodate the ne... more Background and aims – The genus Hebelomina was established in 1935 by Maire to accommodate the new species Hebelomina domardiana, a white-spored mushroom resembling a pale Hebeloma in all aspects other than its spores. Since that time a further five species have been ascribed to the genus and one similar species within the genus Hebeloma. In total, we have studied seventeen collections that have been assigned to these seven species of Hebelomina. We provide a synopsis of the available knowledge on Hebelomina species and Hebelomina-like collections and their taxonomic placement.Methods – Hebelomina-like collections and type collections of Hebelomina species were examined morphologically and molecularly. Ribosomal RNA sequence data were used to clarify the taxonomic placement of species and collections.Key results – Hebelomina is shown to be polyphyletic and members belong to four different genera (Gymnopilus, Hebeloma, Tubaria and incertae sedis), all members of different families an...

IMA fungus, 2018

Nomenclatural type definitions are one of the most important concepts in biological nomenclature.... more Nomenclatural type definitions are one of the most important concepts in biological nomenclature. Being physical objects that can be re-studied by other researchers, types permanently link taxonomy (an artificial agreement to classify biological diversity) with nomenclature (an artificial agreement to name biological diversity). Two proposals to amend the International Code of Nomenclature for algae, fungi, and plants (ICN), allowing DNA sequences alone (of any region and extent) to serve as types of taxon names for voucherless fungi (mainly putative taxa from environmental DNA sequences), have been submitted to be voted on at the 11 International Mycological Congress (Puerto Rico, July 2018). We consider various genetic processes affecting the distribution of alleles among taxa and find that alleles may not consistently and uniquely represent the species within which they are contained. Should the proposals be accepted, the meaning of nomenclatural types would change in a fundament...

Measurement and Control

's 1999 Thomson Lecture-held on 29 September at Glaziers Hall in London-provided an intriguing in... more 's 1999 Thomson Lecture-held on 29 September at Glaziers Hall in London-provided an intriguing insight into a subject that is both established and rapidly developing. It is an example of leading-edge technology, and yet its roots are soundly based in the world of mathematics and its application. An old dog teaching us new tricks, one might say. The speaker was Professor Henry J Beker. And if his face seems familiar to some readers, that might be because his photograph appeared in The Daily Telegraph the following day with news concerning Baltimore Technologies' expansion into the USA.

IEE Proceedings F Communications, Radar and Signal Processing

Our society has become highly dependent on its modern communications systems, e.g. the radio, tel... more Our society has become highly dependent on its modern communications systems, e.g. the radio, television, telephone, telex, facsimile, high-speed datalinks etc. A high proportion of the information disseminated over these communications circuits is confidential in nature. In these situations the communicants should take steps to conceal the content of a message from not only the casual listener but also the determined interceptor. There is little doubt that this problem of protecting and securing communications will continue to grow at an increasing rate over the coming years, not only in its traditional military role but also in the public and commercial domains. The paper considers the type of cryptographic systems available today. As well as discussing the mathematical and statistical requirements of such systems, it explores how, with careful design, most of these needs can be met while the complexity of the hardware implementation is kept to a minimum.

Mycologia

Between 2002 and 2012 regular visits to the Carpathians were made and a number of Hebeloma spp. w... more Between 2002 and 2012 regular visits to the Carpathians were made and a number of Hebeloma spp. were collected from the alpine area. In total 44 collections were made that represent 11 species, two of which, Hebeloma grandisporum and H. oreophilum, are described here as new. Of the 11 species, four (H. alpinum, H. marginatulum and the two species described as new) are known only from alpine or Arctic habitats. Hebeloma dunense and H. mesophaeum are commonly found in, but not restricted to, alpine habitats. The other five species (H. aanenii, H. laterinum, H. naviculosporum, H. vaccinum, H. velutipes) are usually found in lowland or boreal habitats. Hebeloma naviculosporum is reported for the first time from the alpine zone and H. alpinum for the first time as growing with Helianthemum. All but two species (H. alpinum, H. marginatulum) are reported for the first time from the Carpathian alpine zone. In this paper we discuss the habitat, the 11 recorded species and give detailed descr...

Siam Journal on Algebraic Discrete Methods, Jul 17, 2006

Fungal biology, 2016

Hebeloma section Denudata includes the majority of the taxa commonly referred to as the Hebeloma ... more Hebeloma section Denudata includes the majority of the taxa commonly referred to as the Hebeloma crustuliniforme complex. In a recent paper we described in detail H. subsection Denudata and fifteen European species recognised within this subsection, using morphological and molecular methods. In this paper we continue this work and describe in detail three additional subsections and several new species. Within H. subsection Hiemalia we recognise just one species, Hebeloma hiemale. Here we propose an epitype in order to unambiguously define this taxon. Nine species occurring in Europe are assigned to H. subsect. Clepsydroida, namely Hebeloma ammophilum, H. cavipes, H. fragilipes, H. ingratum, H. laetitiae, H. limbatum sp. nov., H. matritense sp. nov., H. pseudofragilipes sp. nov., and H. vaccinum. Finally, we introduce H. subsection Echinospora with three species: Hebeloma echinosporum sp. nov., H. populinum, and H. rostratum sp. nov. We provide descriptions of all three of these spec...

Mycological Progress, 2015

... Cipher systems: The protection of communications. Post a Comment. CONTRIBUTORS: Author: Beker... more ... Cipher systems: The protection of communications. Post a Comment. CONTRIBUTORS: Author: Beker, Henry. Author: Piper, FC (b. 1940, d. ----. PUBLISHER: Wiley (New York). SERIES TITLE: YEAR: 1982. PUB TYPE: Book (ISBN 0471891924 ). VOLUME/EDITION: ...

The security of transactions flowing across a communications network is of ever increasing import... more The security of transactions flowing across a communications network is of ever increasing importance. In many such circumstances it is important not only to protect the messages from passive interception but also, and often of greater importance, to be able to detect any active attack against messages. An active attack may take the form of an interceptor tampering with the message: altering it, adding information, removing information and so on. While it is almost impossible to prevent an active attack there are many mechanisms to ensure, with a high probability, that such an attack may be detected and hence rendered harmless. The techniques to allow detection and thus audit take many forms of which the most common are normally cryptographically based and depend upon the generation, before transmission of the message, of a check-sum which is then appended to the message. The theory underlying this approach works on the basis that if a would-be fraudster changes any part of the mess...

Computer Fraud & Security Bulletin, 1990

SIAM Journal on Algebraic Discrete Methods, 1987