400 research outputs found
The Ursinus Weekly, March 15, 1937
Ditzel is chosen 1938 Ruby editor ⢠Vernon D. Groff elected Weekly editor at annual board meeting ⢠Interracial fellowship to present play on Wednesday ⢠Editor announces formal Ruby to appear on campus in May ⢠Class Day committee named ⢠Prom and play chairmen report completed plans ⢠Bodley, Hayashi named to sports captaincies ⢠Dr. Daniel Poling returns to address chapel meeting ⢠Bassman, Paris best matmen, review of wrestling reveals ⢠Hedgerow theatre group pleases with fine work on plays of diverse theme; English marriage laws, savagery, and modern indifference to war are subjects ⢠Ancient Weeklies show that olden collegiates knew everything we young moderns rave about ⢠Easter program to be offered by the choir Thursday evening ⢠Burtons, China sojourners, tell of conditions there ⢠Co-eds drop first to Beaver sextette ⢠Basketball hash-over reveals that men\u27s teams won but eleven games out of twenty-nine total played ⢠Shreiner sextette leading pack in basketball league ⢠Thoughts turn to baseball \u27tho snow covers diamond ⢠Hess to address postponed history social-science meeting ⢠York alumni hold largest session and elect officers ⢠Ursinus students participate in three college night programshttps://digitalcommons.ursinus.edu/weekly/1925/thumbnail.jp
Third-generation leptoquark decays and collider searches
Collider searches for first-, second-, and third-generation scalar (S) or
vector (V) leptoquarks (LQs) focus on the quark-lepton decay modes S,V -> q l.
For SU(2)-doublet and -triplet leptoquarks with a sufficiently large splitting
between the components, decays involving real W-boson emission (such as
S_2^{(+5/3)} -> S_2^{(+2/3)} W^{+} and others) become possible and can change
the patterns of leptoquark decays. For third-generation leptoquarks, where
these mass splittings might be large, such modes could dominate certain
leptoquark decays as they are (if kinematically allowed) guaranteed to be of
order g^2 where g is the electroweak coupling. We calculate the decay rates for
all such processes involving SU(2)-doublet and triplet, scalar and vector
leptoquarks. Standard limits on mass splittings from precision electroweak
measurements imply that only such decays involving SU(2)-doublet scalar LQs are
likely kinematically possible.Comment: 13 pages, LaTeX, 2 separate postscript figure
Phase II study of TP300 in patients with advanced gastric or gastro-oesophageal junction adenocarcinoma
Background:
TP300, a recently developed synthetic camptothecin analogue, is a highly selective topoisomerase I inhibitor. A phase I study showed good safety and tolerability. As camptothecins have proven active in oesophago-gastric adenocarcinomas, in this phase II study we assessed the efficacy and safety of TP300 in patients with gastric or gastro-oesophageal junction (GOJ) adenocarcinomas.
Methods:
Eligible patients had metastatic or locally advanced gastric or Siewert Types II or III GOJ inoperable adenocarcinoma. Patients were chemotherapy naĂŻve unless this had been administered in the perioperative setting.
TP300 was administered as a 1-h intravenous infusion every 3 weeks (a cycle) for up to 6 cycles at a starting dose of 8 mg/m2 with intra-patient escalation to 10 mg/m2 from cycle 2 in the absence of dose-limiting toxicity. Tumour responses (RECIST 1.1) were assessed every 6 weeks. Toxicity was recorded by NCI-CTCAE version 3.0. Using a modified two-stage Simon design (Stage I and II), a total of 43 patients were to be included providing there were 3 of 18 patients with objective response in Stage I of the study.
Results:
In Stage I of the study 20 patients (14 males, 6 females), median age 67 years (range 40âââ82), performance status ECOG 0/1, with GC [14] or GOJ carcinoma [6] were enrolled. Of the 16 evaluable patients, 11 received the planned dose increase to 10 mg/m2 at cycle 2, 2 decreased to 6 mg/m2, and 3 continued on 8 mg/m2. There were no objective responses after 2 cycles of treatment. Twelve patients had stable disease for 1âââ5 months and 4 had progressive disease. Median progression free survival (PFS) was 4.1 months (CI [1.6âââ4.9]), median time to progression (TTP) was 2.9 months (CI [1.4âââ4.2]). Grade 3/4 toxicities (worst grade all cycles) included 7 patients (35 %) with neutropenia, 4 patients (20 %) with anaemia, 2 patients (10 %) with thrombocytopenia, and 3 patients (15 %) with fatigue.
This study was terminated at the end of Stage I due to a lack of the required (3/18) responders.
Conclusions:
This study of TP300 showed good drug tolerability but it failed to demonstrate sufficient efficacy as measured by radiological response
Modelling train delays with q-exponential functions
We demonstrate that the distribution of train delays on the British railway
network is accurately described by q-exponential functions. We explain this by
constructing an underlying superstatistical model.Comment: 12 pages, 5 figure
Polarized nuclear target based on parahydrogen induced polarization
We discuss a novel concept of a polarized nuclear target for accelerator
fixed-target scattering experiments, which is based on parahydrogen induced
polarization (PHIP). One may be able to reach a 33% free-proton polarization in
the ethane molecule. The potential advantages of such a target include
operation at zero magnetic field, fast (100 Hz) polarization reversal,
and operation with large intensity of an electron beam.Comment: 16 pages, 2 figure
Lower Bound on the Pseudoscalar Mass in the Minimal Supersymmetric Standard Model
In the Higgs sector of the Minimal Supersymmetric Standard Model, the mass of
the pseudoscalar is an independent parameter together with . If is small, then the process is
kinematically allowed and is suppressed only if is small. On the
other hand, the mass of the charged Higgs boson is now near , and the
decay is enhanced if is small. Since the former
has not been observed, and the branching fraction of cannot be
too small (by comparing the experimentally derived cross section
from the leptonic channels with the theoretical prediction), we can infer a
phenomenological lower bound on of at least 60 GeV for all values of
.Comment: 11 pages including 2 figs, reference adde
Can scalar leptoquarks explain the f_{D_s} puzzle?
Motivated by the disagreement between experimental and lattice QCD results on
the D_s decay constant we systematically reinvestigate role of leptoquarks in
charm meson decays. We consider scalar leptoquarks that transform as a weak
interaction triplet, doublet, or singlet in a model independent approach, and
also argue that in a particular SU(5) GUT model these leptoquark states,
contained in the 45-dimensional Higgs representation, could be safe against
proton decay bounds. Using the current experimental measurements in tau, kaon
and charm sectors, we find that scalar leptoquarks cannot naturally explain the
D_s --> mu nu and D_s --> tau nu decay widths simultaneously. While any
contributions of the triplet leptoquarks are already excluded, the singlets
could only contribute significantly to the D_s --> tau nu width. Finally, a
moderate improvement of the experimental upper bound on the D^0 --> mu^+\mu^-
decay width could exclude the doublet contribution to the D_s --> mu nu, while
present experimental data limits its mass to be below 1.4 TeV. Possible new
signatures at present and near future experiments are also briefly discussed.Comment: 8 pages, 2 figures, revtex forma
A Supersymmetric Model with an Extra U(1) Gauge Symmetry
In the standard model the proton is protected from decay naturally by gauge
symmetries, whereas in the ordinary minimal supersymmetric standard model an ad
hoc discrete symmetry is imposed for the proton stability. We present a new
supersymmetric model in which the proton decay is forbidden by an extra U(1)
gauge symmetry. Particle contents are necessarily increased to be free from
anomalies, incorporating right-handed neutrinos. Both Dirac and Majorana masses
are generated for neutrinos, yielding non-vanishing but small masses. The
superpotential consists only of trilinear couplings and the mass parameter
of the minimal model is induced by spontaneous breaking of the U(1)
symmetry.Comment: 10 pages, Revte
Supersymmetric Extension of the Standard Model with Naturally Stable Proton
A new supersymmetric standard model based on N=1 supergravity is constructed,
aiming at natural explanation for the proton stability without invoking an ad
hoc discrete symmetry through R parity. The proton is protected from decay by
an extra U(1) gauge symmetry. Particle contents are necessarily increased to be
free from anomalies, making it possible to incorporate the superfields for
right-handed neutrinos and an SU(2)-singlet Higgs boson. The vacuum expectation
value of this Higgs boson, which induces spontaneous breakdown of the U(1)
symmetry, yields large Majorana masses for the right-handed neutrinos, leading
to small masses for the ordinary neutrinos. The linear coupling of
SU(2)-doublet Higgs superfields, which is indispensable to the superpotential
of the minimal supersymmetric standard model, is replaced by a trilinear
coupling of the Higgs superfields, so that there is no mass parameter in the
superpotential. The energy dependencies of the model parameters are studied,
showing that gauge symmetry breaking is induced by radiative corrections.
Certain ranges of the parameter values compatible with phenomena at the
electroweak energy scale can be derived from universal values of masses-squared
and trilinear coupling constants for scalar fields at a very high energy scale.Comment: 32 pages, Revtex, 7 figure
A Novel Mutation in the HSD17B10 Gene of a 10-Year-Old Boy with Refractory Epilepsy, Choreoathetosis and Learning Disability
Hydroxysteroid (17beta) dehydrogenase 10 (HSD10) is a mitochondrial multifunctional enzyme encoded by the HSD17B10 gene. Missense mutations in this gene result in HSD10 deficiency, whereas a silent mutation results in mental retardation, X-linked, syndromic 10 (MRXS10). Here we report a novel missense mutation found in the HSD17B10 gene, namely c.194T\u3eC transition (rs104886492), brought about by the loss of two forked methyl groups of valine 65 in the HSD10 active site. The affected boy, who possesses mutant HSD10 (p.V65A), has a neurological syndrome with metabolic derangements, choreoathetosis, refractory epilepsy and learning disability. He has no history of acute decompensation or metabolic acidosis whereas his urine organic acid profile, showing elevated levels of 2-methyl-3-hydroxybutyrate and tiglylglycine, is characteristic of HSD10 deficiency. His HSD10 activity was much lower than the normal control level, with normal β-ketothiolase activity. The c.194T\u3eC mutation in HSD17B10 can be identified by the restriction fragment polymorphism analysis, thereby facilitating the screening of this novel mutation in individuals with intellectual disability of unknown etiology and their family members much easier. The patient\u27s mother is an asymptomatic carrier, and has a mixed ancestry (Hawaiian, Japanese and Chinese). This demonstrates that HSD10 deficiency patients are not confined to a particular ethnicity although previously reported cases were either Spanish or German descendants
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