68 research outputs found
Galeriella liciniana, a new cave genus and species of springtails (Collembola, Sminthuridae) from Herzegovina
On the identity of types of Roncus diocletiani ÄurÄiÄ, DimitrijeviÄ & RaÄa and Archaeoroncus tenuis (Hadži) (Pseudoscorpiones, Neobisiidae) from Croatia
Five years ago, ÄurÄiÄ et al. (2008) described two new pseudoscorpions: Roncus diocletiani ÄurÄiÄ, DimitrijeviÄ and RaÄa (from Croatia) and R. orjensis ÄurÄiÄ, DimitrijeviÄ and RaÄa (from Montenegro). The pseudoscorpions studied were mounted on slides with gum-chloral medium. They are deposited in the collection of the Institute of Zoology, Faculty of Biology, University of Belgrade, 11000 Belgrade, Serbia and in the collection of the Natural History Museum, 21000 Split, Croatia. It has been shown that only the male of R. diocletiani belongs to the nominal species, while the female of the same taxon belongs to Archaeoroncus tenuis (Hadži). Therefore, the āallotype maleā of R. diocletiani is actually a holotype of this species, while the āholotypeā of R. diocletiani becomes a paratype of A. tenuis. [Projekat Ministarstva nauke Republike Srbije, br. 173038
On two new cave species of Pseudoscorpions (Neobisiidae, Pseudoscorpiones) from Herzegovina and Dalmatia
A careful analysis of samples of pseudoscorpions (Neobisiidae,
Pseudoscorpiones) from two underground habitats, one near Trebinje
(Herzegovina) and the other from the National Park Paklenica (Croatia), has
yielded two species of the genus Roncus L. Koch new to science, Roncus
tribunus n. sp. and R. argyrunti n. sp. Both new species are described
thoroughly, illustrated, and diagnosed. Some biogeographical and evolutionary
characteristics of the two taxa are briefly discussed. [Projekat Ministarstva
nauke Republike Srbije, br. 173038
Biodiversity of Roncus L. Koch in Montenegro - Roncus teutae n. sp. from Mt. Orjen (Neobisiidae, Pseudoscorpiones)
A single species of Roncus L. Koch, 1873, which was collected in the Baretina
Lokva on Mt. Orjen, Montenegro, is new to science (R. teutae n. sp.) and
described herein. Its diagnostic characters are illustrated and their
distribution is provided. The possible establishment of this species of
Roncus is presented briefly in view of the importance and analysis of its
diagnostic characters. [Projekat Ministarstva nauke Republike Srbije, br.
173038
A new cave pseudoscorpion from Dalmatia - Microchthonius tragurion n. sp. (Chthoniidae, Pseudoscorpiones)
A new eyeless pseudoscorpion, Microchthonius tragurion n. sp., from a cave in Blizna Donja (near Trogir), from the Jama kod Gomilje Pit, Dalmatia, is described. This new false scorpion differs from all other congeners. There exists a probability that this new taxon is a relict of a tropical fauna incorporating the once northern and tropical area, now representing the subtropical part of the Mediterranean. Morphometric ratios, figures and linear measurements of the new taxon are presented in detail. [Projekat Ministarstva nauke Republike Srbije, br. 173038
A new Pseudoscorpion from Bosnia: Roncus bosniensis n. sp. (Neobisiidae, Pseudoscorpiones)
A new species of troglobitic false scorpion, Roncus bosniensis n. sp.
(Neobisiidae, Pseudoscorpiones), is described from inside an underground
habitat, the Jama Pored Puta Pit, nr. Jajce, Bosnia and Herzegovina. The
analyzed pseudoscorpion proves to differ from all other congeners, but is
closest to R. hajnehaj ÄurÄiÄ & DimitrijeviÄ. It is possible that the
subterranean pseudoscorpion analyzed represents a relict of an old tropical
faunal pattern of the Mediterranean. [Projekat Ministarstva nauke Republike
Srbije, br. 173038
One hundred millipede species in Serbia (Arthropoda: Myriapoda: Diplopoda)
The millipede fauna of Serbia consists of 100 species, 44 genera, 16 families
and 7 orders. The most abundant are families Julidae (41 species or 41%) and
Polydesmidae (22 species or 22%). Of the total number, 27 species (27%) are
endemic to Serbia, while 18 (18%) are endemic to the Balkan Peninsula. All
registered species can be related to 15 zoogeographical categories. Glomeris
klugii Brandt, 1833 (Glomerida: Glomeridae), Cibiniulus phlepsii (Verhoeff,
1897) (Julida: Blaniulidae), Brachyiulus bagnalli (Brolemann, 1924),
Megaphyllum carniolense (Verhoeff, 1897), Typhloiulus incurvatus Verhoeff,
1899, Xestoiulus luteus (Attems, 1951) (all Julida: Julidae), and Polydesmus
renschi Schubart, 1934 (Polydesmida: Polydesmidae) represent new records for
the diplopod fauna of Serbia. [Projekat Ministarstva nauke Republike Srbije,
br. 173038
A new cave diplopod of the genus Brachydesmus heller, 1858 from southwest Serbia (Diplopoda: Polydesmida: Polydesmidae)
A new cave polydesmid, Brachydesmus sjenicae n. sp. is described from Ledena PeÄina Cave, in southwest Serbia. The new taxon belongs to the vermosanus-group of species. Relationships with congeners are briefly discussed. The distribution map and key is given for all currently known taxa belonging to this group of species. [Projekat Ministarstva nauke Republike Srbije, br. 173038
Radiative charge transfer lifetime of the excited state of (NaCa)
New experiments were proposed recently to investigate the regime of cold
atomic and molecular ion-atom collision processes in a special hybrid
neutral-atom--ion trap under high vacuum conditions. The collisional cooling of
laser pre-cooled Ca ions by ultracold Na atoms is being studied. Modeling
this process requires knowledge of the radiative lifetime of the excited
singlet A state of the (NaCa) molecular system. We calculate
the rate coefficient for radiative charge transfer using a semiclassical
approach. The dipole radial matrix elements between the ground and the excited
states, and the potential curves were calculated using Complete Active Space
Self-Consistent field and M\"oller-Plesset second order perturbation theory
(CASSCF/MP2) with an extended Gaussian basis, 6-311+G(3df). The semiclassical
charge transfer rate coefficient was averaged over a thermal Maxwellian
distribution. In addition we also present elastic collision cross sections and
the spin-exchange cross section. The rate coefficient for charge transfer was
found to be cm/sec, while those for the elastic and
spin-exchange cross sections were found to be several orders of magnitude
higher ( cm/sec and cm/sec,
respectively). This confirms our assumption that the milli-Kelvin regime of
collisional cooling of calcium ions by sodium atoms is favorable with the
respect to low loss of calcium ions due to the charge transfer.Comment: 4 pages, 5 figures; v.2 - conceptual change
Quantum saturation and condensation of excitons in CuO: a theoretical study
Recent experiments on high density excitons in CuO provide evidence for
degenerate quantum statistics and Bose-Einstein condensation of this nearly
ideal gas. We model the time dependence of this bosonic system including
exciton decay mechanisms, energy exchange with phonons, and interconversion
between ortho (triplet-state) and para (singlet-state) excitons, using
parameters for the excitonic decay, the coupling to acoustic and low-lying
optical phonons, Auger recombination, and ortho-para interconversion derived
from experiment. The single adjustable parameter in our model is the
optical-phonon cooling rate for Auger and laser-produced hot excitons. We show
that the orthoexcitons move along the phase boundary without crossing it (i.e.,
exhibit a ``quantum saturation''), as a consequence of the balance of entropy
changes due to cooling of excitons by phonons and heating by the non-radiative
Auger two-exciton recombination process. The Auger annihilation rate for
para-para collisions is much smaller than that for ortho-para and ortho-ortho
collisions, explaining why, under the given experimental conditions, the
paraexcitons condense while the orthoexcitons fail to do so.Comment: Revised to improve clarity and physical content 18 pages, revtex,
figures available from G. Kavoulakis, Physics Department, University of
Illinois, Urban
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