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Search Results: 1 - 10 of 191420 matches for " Natalie G. Dawson "
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Going Coastal: Shared Evolutionary History between Coastal British Columbia and Southeast Alaska Wolves (Canis lupus)
Byron V. Weckworth,Natalie G. Dawson,Sandra L. Talbot,Melanie J. Flamme,Joseph A. Cook
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0019582
Abstract: Many coastal species occupying the temperate rainforests of the Pacific Northwest in North America comprise endemic populations genetically and ecologically distinct from interior continental conspecifics. Morphological variation previously identified among wolf populations resulted in recognition of multiple subspecies of wolves in the Pacific Northwest. Recently, separate genetic studies have identified diverged populations of wolves in coastal British Columbia and coastal Southeast Alaska, providing support for hypotheses of distinct coastal subspecies. These two regions are geographically and ecologically contiguous, however, there is no comprehensive analysis across all wolf populations in this coastal rainforest.
Looking for CP Violation in W Production and Decay
S. Dawson,G. Valencia
Physics , 1995, DOI: 10.1103/PhysRevD.52.2717
Abstract: We describe CP violating observables in resonant $W^\pm$ and $W^\pm$ plus one jet production at the Tevatron. We present simple examples of CP violating effective operators, consistent with the symmetries of the Standard Model, which would give rise to these observables. We find that CP violating effects coming from new physics at the $TeV$ scale could in principle be observable at the Tevatron with $10^6$ $W^\pm$ decays.
Probing Anomalous Gauge Boson Couplings at LEP
S. Dawson,G. Valencia
Physics , 1994,
Abstract: We bound anomalous gauge boson couplings using LEP data for the $Z\rightarrow {\overline f} f$ partial widths. We use an effective field theory formalism to compute the one-loop corrections resulting from non-standard model three and four gauge boson vertices. We find that measurements at LEP constrain the three gauge boson couplings at a level comparable to that obtainable at LEPII.
Bounds on $g_5^Z$ from Precision LEP Measurements
S. Dawson,G. Valencia
Physics , 1994, DOI: 10.1016/0370-2693(94)91031-6
Abstract: The parity violating but CP conserving anomalous three-gauge-boson coupling $g_5^Z$ induces a universal contribution to the left-handed coupling of the $Z$ boson to fermions. We find that the LEP measurements of the partial $Z$ widths and lepton forward-backward asymmetries are sufficiently precise to place a bound of order $|g_5^Z|$ less than $\sim~10\%$. This bound is significantly better than what can be obtained at present from rare $K$ and $B$ meson decays.
$K_L \ra μ^\pm e^\mp ν\overlineν$ as background to $K_L \ra μ^\pm e^\mp$
S. Dawson,G. Valencia
Physics , 1993, DOI: 10.1103/PhysRevD.48.209
Abstract: We consider the process $K_L \ra \mu^\pm e^\mp \nu \overline{\nu}$ at next to leading order in chiral perturbation theory. This process occurs in the standard model at second order in the weak interaction and constitutes a potential background in searches for new physics through the modes $K_L \ra \mu^\pm e^\mp$. We find that the same cut, $M_{\mu e}>489$~MeV, used to remove the sequential decays $K_{l3}\ra \pi_{l2}$ pushes the $B(K_L \ra \mu^\pm e^\mp \nu \overline{\nu})$ to the $10^{-23}$ level, effectively removing it as a background.
Signals For Parity Violation in the Electroweak Symmetry Breaking Sector
S. Dawson,G. Valencia
Physics , 1993, DOI: 10.1103/PhysRevD.49.2188
Abstract: We consider the possibility of observing a parity violating but $CP$ conserving interaction in the symmetry breaking sector of the electroweak theory. We find that the best probe for such an interaction is a forward-backward asymmetry in $W^+W^-$ production from polarized $e^-_R e^+_L$ collisions. An observable asymmetry would be strong evidence against a custodial $SU(2)$ symmetry. We also discuss the effects of such an interaction in future $e^- \gamma$ colliders as well as in rare decays of $K$ and $B$ mesons.
Bounds on Anomalous Gauge Boson Couplings From Partial Z Widths at LEP
S. Dawson,G. Valencia
Physics , 1994, DOI: 10.1016/0550-3213(95)00042-Q
Abstract: We place bounds on anomalous gauge boson couplings from LEP data with particular emphasis on those couplings which do not contribute to $Z$ decays at tree level. We use an effective field theory formalism to compute the one-loop corrections to the $Z\rightarrow {\overline f} f$ decay widths resulting from non-standard model three and four gauge boson vertices. We find that the precise measurements at LEP constrain the three gauge boson couplings at a level comparable to that obtainable at LEPII and LHC.
Limits on Non-Standard Top Quark Couplings from Electroweak Measurements
S. Dawson,G. Valencia
Physics , 1995, DOI: 10.1103/PhysRevD.53.1721
Abstract: We calculate the typical size of loop corrections to electroweak observables arising from non-standard $Z {\overline t } t$ and $W t b$ vertices. We use an effective Lagrangian formalism based on the electroweak gauge group $SU(2)_L\times U(1)_Y \rightarrow U(1)_{EM}$. Limits on the non-standard model top quark couplings from electroweak observables are presented and compared with previously obtained limits.
Physician versus Patient Perception of Physician Hospital Discharge Communication: A Preliminary Study  [PDF]
Michael J. Maniaci, Michael G. Heckman, Nancy L. Dawson
Open Journal of Internal Medicine (OJIM) , 2014, DOI: 10.4236/ojim.2014.44016
Abstract: Background: Physician discharge instructions are critical to patient care because they are the link transitioning the hospital care plan to the home. We hypothesize that physician perception of discharge instructions communication is better than patient perception. Objective: In a preliminary study, to compare patient and physician perception of communication at discharge. Design: Observational, survey-based. Setting: 330-bed adult teaching hospital. Participants: Surveys were mailed to 100 patients discharged home and 49 internal medicine physicians responsible for those patients’ care. Each physician had between 1 and 4 patients surveyed. Measurements: Patients and physicians received anonymous 5-item questionnaires concerning physician communication at discharge. Patient surveys inquired about their physicians’ communication at the specific physician encounter, while physician surveys asked about the physicians’ overall self-perception of discharge communication skills. Results: Completed questionnaires were returned by 59 patients and 40 physicians. Physicians reported a noticeably better perception of communication than their patients regarding spending adequate time reviewing the discharge plan (83% vs. 61%, P = 0.027), speaking slowly enough to understand (98% vs. 80%, P = 0.013), using wording that could be easily understood (100% vs. 68%, P < 0.001) and taking time to answer questions before discharge (85% vs. 59%, P = 0.008). Perception of discharge communication improved with physician experience for several survey items. Conclusions: This study provides evidence suggesting that physician perception of communication at discharge is better than patient perception. Future studies of larger sample size and direct patient-physician pairing focusing on patient satisfaction and outcomes are needed.
Axillary “Exclusion”—A Successful Technique for Reducing Seroma Formation after Mastectomy and Axillary Dissection  [PDF]
Natalie Chand, Anna M. G. Aertssen, Gavin T. Royle
Advances in Breast Cancer Research (ABCR) , 2013, DOI: 10.4236/abcr.2013.21001
Abstract: Introduction: A seroma is the commonest complication of breast cancer surgery, and although its consequences most often cause no more than discomfort and anxiety, more important sequelae include flap necrosis and wound breakdown. Infection developing within seroma increases morbidity and often results in the need for re-admission, re-imaging, drainage and antibiotic usage. Numerous methods to reduce post-mastectomy seroma formation have been tried with no consistent success. Methods: 24 consecutive patients undergoing mastectomy and axillary clearance were recruited before and after a departmental change in practice. At the point of skin closure, patients either underwent “axillary exclusion” or not. Total drain outputs were recorded by community district nursing staff for all patients. At the first post-operative visit, the presence and severity of seroma was recorded. Results: 24 patients were included (study group 14, control group 10). Age, size of tumour, and number of positive lymph nodes and laterality were comparable between groups. Mean drain output for the entire group was 471 ml (3 - 1030 ml) over 5.21 days. The control group had a drain output of 763.5 ml (95%CI 674.2 - 852.8) while the study group had a mean drainage of 262.2 ml (95%CI 161.9 - 362.5), a reduction of over 65%, p < 0.001. 15 (62.5%) out of 24 patients developed seroma. 42.9% of the study group and 90% of the control group developed seroma, p < 0.01. Conclusion: Seromas are a common complication following mastectomy and axillary clearance. Our technique of axillary exclusion has resulted in significantly reduced drainage volumes and fewer seromas.
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