43,884 research outputs found
FIGURE 15 in Systematic position of Apodemia paucipuncta (Riodinidae), and a critical evaluation of the nymphidiine transtilla
No full textFIGURE 15. Character state changes reconstructed for the presence/absence of balloon setae (not used in the analysis). Character states were assigned for each species based on published and unpublished life history accounts (DeVries et al. 1994, DeVries 1997 and pers. obs.; K. Nishida pers. com.).Published as part of Penz, Carla M. & Devries, Philip J., 2006, Systematic position of Apodemia paucipuncta (Riodinidae), and a critical evaluation of the nymphidiine transtilla, pp. 1-50 in Zootaxa 1190 on page 34, DOI: 10.5281/zenodo.264614
Rhombopsis longinquus DeVries 2019, sp. nov.
No full textRhombopsis longinquus sp. nov. (Figure 5 (j), 5(k), 5(m), 5(n)) Diagnosis Fusiform, with well-defined sutural ramp and subsutural collar weak or absent. Axial ribs and growth lines sinuate. Spiral cords numerous, vary in strength across mid-section of last whorl. Description Shell length to about 25 mm, fusiform with and moderately high spire and long anterior canal. Protoconch unknown. Teleoconch with four or five convex whorls with sutural ramp, and sharply rounded shoulder. Subsutural collar weak or non-existent; periphery at or just below shoulder angle. Sutures appressed. Axial sculpture of about 11 ribs extending length of spire whorls but fading on sutural ramp and below periphery on last whorl. Ribs and growth lines sinuate with broad sulcus centred on periphery. Spiral sculpture of weakly scabrous spiral cords and threads: about seven strong threads on ramp; spire whorls and peripheral area of last whorl with weak primary spiral cords and intervening threads, numbering one to three; remaining anterior of body whorl with about 15 weak primary spiral cords. Spiral cords and some threads cross axial ribs. Anterior canal poorly preserved. Siphonal fasciole present, poorly preserved. Parietal wall without callus; columella straight, slightly excavated. Posterior canal absent. Outer lip and growth lines sinuate. Remarks When compared with Olsson ’ s (1944) figured specimen of Rhombopsis meridionalis, specimens of R. longinquus sp. nov. are more sharply shouldered and the axial ribs are more pronounced at the periphery and shoulder. Details of the spiral sculpture are identical. Etymology ‘ Longinquus ’, Latin adjective for ‘ remote ’, referencing the fact that nearly all other species of Rhombopsis occur in Cretaceous strata of North America (Sohl 1964). Material UWBM 107630, holotype, B8772 (type locality), L (18.3), W (11.6); remainder are paratypes: UWBM 107631, B8772, L (22.5), W (14.9); UWBM 107632, B8769, L (16.4), W (10.8); MUSM INV 269, B8769, L (19.9), W 12.6; MUSM INV 270, B8769, L (20.3), W 11.9. Occurrence Lower Paleogene, Cuenca Member, Caballas Formation, East Pisco Basin, southern Peru.Published as part of DeVries, Thomas J., 2019, Early Paleogene brackish-water molluscs from the Caballas Formation of the East Pisco Basin (Southern Peru), pp. 1533-1584 in Journal of Natural History 53 (25) on page 1572, DOI: 10.1080/00222933.2018.1524032, http://zenodo.org/record/367022
Measurement of the ratio of branching fractions B(B0→K∗0γ )/B(B0s→φγ ) and the directCP asymmetry inB 0→K∗0γ
No full textThe ratio of branching fractions of the radiative B decays B0→K⁎0γ and B0s→ϕγ has been measured using an integrated luminosity of 1.0 fb−1 of pp collision data collected by the LHCb experiment at a centre-of-mass energy of s√=7TeV. The value obtained is
B(B0→K⁎0γ)B(B0s→ϕγ)=1.23±0.06(stat.)±0.04(syst.)±0.10(fs/fd),
where the first uncertainty is statistical, the second is the experimental systematic uncertainty and the third is associated with the ratio of fragmentation fractions fs/fd. Using the world average value for B(B0→K⁎0γ), the branching fraction B(B0s→ϕγ) is measured to be (3.5±0.4)×10−5.
The direct CP asymmetry in B0→K⁎0γ decays has also been measured with the same data and found to be
ACP(B0→K⁎0γ)=(0.8±1.7(stat.)±0.9(syst.))%.
Both measurements are the most precise to date and are in agreement with the previous experimental results and theoretical expectations
∑_(l+m=k,l,m≥0) ((α+l-1)¦l) ((β+m-1)¦m)=((α+β+k-1)¦k) and its application to negative binomial distribution
No full textWe prove here the following equation: ∑_(l+m=k,l,m≥0) ((α+l-1)¦l) ((β+m-1)¦m)=((α+β+k-1)¦k) and give its application to prove the reproductive property of the negative binomial distribution.
These finite sum equation involving binomial coefficients and proof of the reproductive property are not known as far as the author knows.論文(Article)departmental bulletin pape
Extended hatching periods in the subantarctic lithodid crabs Lithodes santolla and Paralomis granulosa (Crustacea: Decapoda: Lithodidae)
No full textTemporal pattern of hatching was studied in the subantarctic lithodid crabs Lithodes santolla (Molina) and Paralomis granulosa (Jaquinot) from the Argentine Beagle Channel. In both species, larval hatching occurred in low daily numbers over an extended period of up to several weeks, depending on hatch size. Low daily hatching activity and low oxygen-consumption rates in freshly hatched P. granulosa larvae are discussed as life history adaptations to, and/or physiological constraints by, the environmental conditions of high latitudes. <br/
Quantum chemical investigations on sensory photoreceptors in natural and artificial systems
No full textIn this project an artificial photoreceptor of cryptochrome type, phenothiazine-pyrene-flavin dyad, and a family of biological photoreceptors, the BLUF domain proteins, were studied using ab initio calculations. Linear response based methods (CC2 and TD-DFT) were used to describe the electronically excited states, which include locally excited (LE) as well as charge transfer states (CT). A conical intersection between the these two excited states was shown to be responsible for the activation of the CT state and causing the fluorescence quenching.
In the case of BLUF domains, the hybrid QM/MM approach was used to describe the flavin and its natural environment. In this work it was shown that the highly conserved glutamine residue, situated in the vicinity of the flavin chromophore undergoes isomerization as a result of photoexcitation. This initiates the formation of a stable signaling state conforamtion of the protein which may be stabilized by the change in the orientation of the highly discussed Trp and Met residues within the flavin binding pocket
A complex diagenetic history for the Miocene invertebrates of the East Pisco basin (Peru).
No full textThe Miocene marine sediments of the East Pisco Basin (southern Peru) are well-known for their extraordinary
concentration of exceptionally well-preserved fossils of marine vertebrates together with invertebrate remains (Di
Celma et al., 2017).
In the western Ica Valley, the late Oligocene-early Miocene Chilcatay Formation consists of sandstones and
siltstones interbedded with layers of cobbles and overlaid by clinoformed coarse-grained biocalcarenites. Fossil
invertebrates are common and well-preserved, but the assemblage is characterized by low biodiversity, with only few
species of barnacles, echinoids, tube worms and bivalves (mainly pectinids and oysters). Overall, biogenic Cacarbonates
are present and well-preserved.
In the same region, the late Miocene Pisco Formation consists of three unconformity-bounded depositional
sequences (Di Celma et al., 2017), made of sandstone at the base and diatomaceous siltstones at the top. It shows
mollusk-rich layers characterized by low biodiversity and high dominance (DeVries, 1988; Di Celma et al., 2017).
Mollusks are commonly preserved only as gypsum casts or dolomite/gypsum molds. Pristine mollusk shells are rare and
pure Ca-carbonates are only occasionally observed.
With the aim of reconstructing the diagenetic histories of both formations, mollusk and barnacle samples have been
first analyzed under the optical microscope and SEM-EDS, and then analyzed via Raman spectroscopy (to recognize
mineral phases) and cathodoluminescence (to discriminate pristine carbonates and different cement generations). The
results of mineralogical and geochemical analyses, integrated with taphonomic observations, enabled us to reconstruct
the sequence of the diagenetic processes; for example, Sr-isotope ratios measured on mollusk samples from the Pisco
Formation proved that dolomite precipitation occurred during the early diagenesis as recently proposed (Gariboldi et al.,
2015). These analytical results will allow to reconstruct the still rather neglected but remarkably complex diagenetic
history of the Miocene invertebrates of the East Pisco Basin
First observation of the decay Bs0→K*0K*0
No full textThe first observation of the decay B0s→K∗0K∗0 is reported using 35 pb−1 of data collected by LHCb in proton–proton collisions at a centre-of-mass energy of 7 TeV. A total of 49.8±7.5 B0s→(K+π−)(K−π+) events are observed within ±50 MeV/c2 of the B0s mass and 746 MeV/c2 < mKπ < 1046 MeV/c2, mostly coming from a resonant B0s→K∗0K∗0 signal. The branching fraction and the CP-averaged K∗0 longitudinal polarization fraction are measured to be B(B0s→K∗0K∗0)=(2.81±0.46(stat.)±0.45(syst.)±0.34(fs/ fd))×10−5 and fL =0.31±0.12(stat.)±0.04(syst.)
Branching fraction and CP asymmetry of the decays B+→K0Sπ+ and B+→K0SK+
No full textAn analysis of B+ → K0
Sπ+ and B+ → K0
S K+ decays is performed with the LHCb experiment. The pp
collision data used correspond to integrated luminosities of 1 fb−1 and 2 fb−1 collected at centre-ofmass
energies of
√
s = 7 TeV and
√
s = 8 TeV, respectively. The ratio of branching fractions and the
direct CP asymmetries are measured to be B(B+ → K0
S K+
)/B(B+ → K0
Sπ+
) = 0.064 ± 0.009 (stat.) ±
0.004 (syst.), ACP(B+ → K0
Sπ+
) = −0.022 ± 0.025 (stat.) ± 0.010 (syst.) and ACP(B+ → K0
S K+
) =
−0.21 ± 0.14 (stat.) ± 0.01 (syst.). The data sample taken at
√
s = 7 TeV is used to search for
B+
c
→ K0
S K+ decays and results in the upper limit ( fc · B(B+
c
→ K0
S K+
))/( fu · B(B+ → K0
Sπ+
)) <
5.8 × 10−2 at 90% confidence level, where fc and fu denote the hadronisation fractions of a ¯b
quark
into a B+
c or a B+ meson, respectively
Dispelling the Myths Behind First-author Citation Counts
No full textWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
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