919 research outputs found
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What's in a name: an update on epithets used in <i>Aloe</i> L. (Asphodelaceae)
This paper updates the previously published list (Figueiredo & Smith, 2010) of 876 epithets used in the genus Aloe L.(Asphodelaceae). A further 32 epithets are added to the list. Some epithets for which derivations could not be traced at the time are relisted here with their meaning. This addition brings to 908 the total number of unique epithets used in the genus at specific, subspecific and varietal ranks. The list of epithets provided here includes their dates of application, meaning and derivation
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Caputia tomentosa
Caputia, a genus belonging to the daisy family, the Asteraceae, consists of just five species of succulents confined to South Africa and Swaziland. Caputia tomentosa (formerly Kleinia tomentosa or Senecio haworthii) is unique in the genus in having dense silvery-white persistent tomentum and disciform capitula (inflorescences). Its very long and complex taxonomic and nomenclatural history are outlined. Its habitat, natural distribution, ecology and cultivation are discussed, accompanied by a full description and specially commissioned reproduction of a watercolour painting
SNA and SNB Angles in a Population of Nubian Schoolchildren
The descriptive statistics for the sella-nasion-A Point (SNA) and sella-nasion-B point (SNB) angles computed from a sample of Nubian schoolchildren are presented, by age and sex, and compared with the analogous statistics for American Caucasian schoolchildren .Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/67163/2/10.1177_00220345750540041101.pd
Roentgen cephalometric analysis of ridge resorption and changes in jaw and occlusal relationships in immediate complete denture wearers
In eighteen subjects assigned for immediate complete upper and lower dentures, roentgen cephalometric recordings were made before extraction of the residual anterior dentition and 3 weeks, 3 months, 6 months and 1 year after denture insertion. The cephalometric analysis was based on electronic measurements of linear and angular morphological variables and computer head plots generated from 177 reference points (Walker, 1967), derived for each subject for each of the five observation stages. The reduction of the alveolar ridges was most rapid during the first 3 months of denture wear and particularly during the post-extraction period of 3 weeks. The reduction in anterior height of the lower ridge was on average twice as great as that of the upper ridge. The ridge resorption and the accompanying settling of the dentures on the basal seats, measured from lead shots inserted in the dentures, brought about an upward rotation of the mandible with a resulting decrease in occlusal vertical dimension and reduction in overjet of the dentures. In accordance with the amount of ridge reduction, these changes showed great individual variation.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/73577/1/j.1365-2842.1980.tb01466.x.pd
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Aloidendron barberae
Aloidendron is a very small genus of seven tree aloes in the family Asphodelaceae, described as recently as 2013, ranging from South Africa to Mozambique, with a large disjunction to Somalia, Yemen and Saudi Arabia.
Aloidendron barberae is recorded from South Africa, Swaziland and southern Mozambique. However, the records for Mozambique are queried here and it is suggested that these actually relate to its closest relative, Aloidendron tongaense, a smaller tree only 4-8 m tall, which may be endemic to Mozambique.
Aloidendron barberae is the largest alooid, growing to 20 m tall and is copiously dichotomously branched. Its taxonomic and nomenclatural history are outlined. Its habitat, natural distribution, ecology and cultivation are discussed, accompanied by a full description and reproduction of a specially commissioned watercolour painting
Non Linear Compton Scattering of Strong Laser Radiation on Channeled Particles in a Crystal
A version for intense -ray radiation based on the multiphoton
scattering of strong laser radiation on relativistic particle beam channeled in
a crystal is proposed. The scheme is considered when the incident laser beam
and charged paricles beam are counter-propagating and the laser radiation is
resonant to the energy levels of transversal motion of channeled particles.Comment: 5 pages, Revte
Effect of time at temperature on wild poliovirus titers in stool specimens
AbstractBackgroundThe effect of transport temperature on the viability of poliovirus in stool specimens from paralyzed cases has not been tested. Quality assurance of programmatic indicators will be necessary in the final phase of polio eradication.ObjectiveTo estimate the effect of time at elevated temperatures on wild poliovirus titers in stool specimens.MethodsWe exposed aliquots of pooled wild poliovirus type 1 specimens to elevated temperatures (27°C, 31°C, and 35°C) for varying time periods up to 14 days. We determined the virus titer of these aliquots and created decay curves at each temperature to estimate the relationship between time at temperature and virus titer.ResultsWe found significantly different slopes of decay at each temperature. The negative slopes increased as the temperature increased.ConclusionsWhile poliovirus in stool remains relatively stable at moderately elevated temperature, transport at higher temperatures could impact sample integrity and virus isolation results
The Role of the D13 (1520) Resonance in eta Electroproduction
We investigate the electroproduction of eta mesons below a center of momentum
energy of 1.6 GeV, with particular emphasis on the roles of the N*(1535) and
N*(1520) resonances. Using the effective Lagrangian approach, we show that the
transverse helicity amplitude of the N*(1535) can be extracted with good
accuracy from the new eta electroproduction data, under reasonable assumptions
for the strength of the longitudinal helicity amplitude. In addition, although
the differential cross section is found to to have a small sensitivity to the
N*(1520) resonance, it is shown that a recently completed double polarization
experiment is very sensitive to this resonance.Comment: 7 pages, Revtex, 3 figure
What’s in a name : an update on epithets used in Aloe L. (Asphodelaceae)
This paper updates the previously published
list (Figueiredo & Smith, 2010) of 876 epithets
used in the genus Aloe L. (Asphodelaceae).
A further 32 epithets are added to the list. Some
epithets for which derivations could not be traced
at the time are relisted here with their meaning.
This addition brings to 908 the total number of
unique epithets used in the genus at specific, subspecific
and varietal ranks. The list of epithets
provided here includes their dates of application,
meaning and derivation.Dieser Beitrag ergänzt die
früher publizierte Liste (Figueiredo & Smith,
2010) von 876 in der Gattung Aloe L.
(Asphodelaceae) benutzten Epitheta. Diese Liste
wird mit 32 weiteren Epitheta ergänzt. Für
einige Epitheta, für welche seinerzeit die
Ableitung nicht in Erfahrung gebracht werden
konnte, wird hier ein ergänzter Eintrag mit ihrer
Bedeutung gegeben. Mit diesen Zusätzen zählt
die Liste nun 908 in der Gattung einmalig auf den
Rangstufen der Art, Unterart oder Varietät
verwendeten Epitheta. Die hier vorgelegte Liste
von Epitheta enthält das Datum der Verwendung,
die Bedeutung, und die Ableitung.http://www.bcss.org.uk/journal.htm
The Imprint of Gravitational Waves on the Cosmic Microwave Background
Long-wavelength gravitational waves can induce significant temperature
anisotropy in the cosmic microwave background. Distinguishing this from
anisotropy induced by energy density fluctuations is critical for testing
inflationary cosmology and theories of large-scale structure formation. We
describe full radiative transport calculations of the two contributions and
show that they differ dramatically at angular scales below a few degrees. We
show how anisotropy experiments probing large- and small-angular scales can
combine to distinguish the imprint due to gravitational waves.Comment: 11 pages, Penn Preprint-UPR-
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