Hebeloma subsection Denudata includes the type of H. section Denudata, Hebeloma crustuliniforme, as well as the majority of the taxa commonly included in the Hebeloma crustuliniforme complex. ...Complementing the work of D.K. Aanen and co-workers,
and using refined morphological and molecular methods we were able to recognize further individual taxa within the section. Fifteen species occurring in Europe are assigned to H. subsect. Denudata. Of these, we describe eight species as new, namely H. aanenii, H. aurantioumbrinum,
H. geminatum, H. louiseae, H. luteicystidiatum, H. pallidolabiatum, H. perexiguum and H. salicicola. Naucoria bellotiana, a species very similar to H. alpinum is recombined into Hebeloma. A key to Hebeloma subsect. Denudata
is provided. We demonstrate that within this subsection there is good overall consistency between morphological, phylogenetic and biological species concepts. In contrast to current opinion, in this group there is little species overlap, particularly when also considering species frequencies,
between arctic and alpine floras on one hand and temperate on the other.
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 descriptions of the two new species, both morphologically and molecularly. A key for Hebeloma species from sect. Hebeloma occurring in Arctic-alpine habitats is provided.
Eight new 5-(quinolinylmethylene)barbituric acid derivatives were synthesized by the reaction of 1,3-dimethylbarbituric acid and 1,3-diethyl-2-thiobarbituric acid with quinoline-4-carboxaldehydes and ...several quinoline-2-carboxaldehydes via Knoevenagel condensation. The novel compounds were characterized by 1H NMR, 13C NMR, mass, IR, and UV-visible spectral data and elemental analyses. d.c. and a.c. conduction properties of the compounds were investigated in the frequency range of 40–105 Hz and temperature range 295–440 K. The d.c. results showed an activated conductivity dependence on temperature for all films. Obtained data reveal that a.c. conductivity obeys the relation σac(ω)=Aωs and exponent s is found to decrease by increasing temperature. The analysis of the a.c. conduction data showed that the CBH model is the dominant conduction mechanism for the electron transport in the films. Gas sensing properties of the films for the volatile organic compounds (VOCs) were also investigated in the same temperature range. Maximum sensitivity to VOCs was observed at around 360 K for compound 6.
The Omega3/LHC1 pixel detector readout chip comprises a matrix of 128 × 16 readout cells of 50
μm × 500
μm and peripheral functions with 4 distinct modes of initialization and operation, together ...more than 800 000 transistors. Each cell contains a complete chain of amplifier, discriminator with adjustable threshold and fast-OR output, a globally adjustable delay with local fine-tuning, coincidence logic and memory. Every cell can be individually addressed for electrical test and masking. First results have been obtained from electrical tests of a chip without detector as well as from source measurements. The electronic noise without detector is ∼ 100 e
− rms. The lowest threshold setting is close to 2000 e
− and non-uniformity has been measured to be better than 450 e
− rms at 5000 e
− threshold. A timewalk of < 10 ns and a precision of < 6 ns rms on a delay of 2 μs have been measured. The results may be improved by further optimization.
This paper addresses section
Theobromina
within the genus
Hebeloma
(Agaricales). We recognise seven European species within this section, three of which are described as new:
Hebeloma alboerumpens
,
...H. griseopruinatum
and
H
.
parvicystidiatum
. The first two of these species appear to be ectomycorrhizal with Cistaceae:
Cistus
and
Helianthemum
.
Hebeloma parvicystidiatum
is more likely to be in mycorrhizal association with
Quercus
spp. We also provide a key to the European species within sect.
Theobromina
and an updated key of known
Hebeloma
associates of
Cistus
. Molecular analyses based on multiple loci further illustrate the distinctness of the newly described taxa and provide molecular evidence, supporting the morphological evidence, for the relationship that exists among species of this section. The ITS is the only one from the sequenced loci that, alongside with morphology, distinguishes among all of the species of sect.
Theobromina
. The section gains most of its molecular support from the
MCM7
locus, followed by
RPB2
.
The Omega-3 readout chip is presented in detail elsewhere in the same proceedings 1. We here describe the integration of the chip into present and future experiments describing both hardware and ...software aspects. We cover preliminary tests in the laboratory and on the beam. The WA97 experiment has already used a pixel telescope in the past 4 and intends to upgrade to the Omega-3 chip. A newly proposed experiment at CERN studying strangeness production in heavy ion collisions also plans to use a similar telescope. Finally, we give an outlook on the ongoing developments in the pixel readout architecture in the context of ALICE, the heavy ion experiment at the LHC collider.
A purely algebraic theory based on the dynamical group SU(1,1) is used to treat perturbations to the SHO problem. In particular potentials of the form
1
r
2N
and
r
2
N
are treated explicitly.
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