11 research outputs found
Low-Loss All-Optical Zeno Switch in a Microdisk Cavity Using EIT
We present theoretical results of a low-loss all-optical switch based on
electromagnetically induced transparency and the classical Zeno effect in a
microdisk resonator. We show that a control beam can modify the atomic
absorption of the evanescent field which suppresses the cavity field buildup
and alters the path of a weak signal beam. We predict more than 35 dB of
switching contrast with less than 0.1 dB loss using just 2 micro-Watts of
control-beam power for signal beams with less than single photon intensities
inside the cavity.Comment: Updated with new references, corrected Eq 2a, and added introductory
text. 7 pages, 5 figures, 3 table
Ovário-histerectomia: estudo experimental comparativo entre as abordagens laparoscĂłpica e aberta na espĂ©cie canina. II- Evolução clĂnica pĂłs-operatĂłria
Does Irrigation of the Subdiaphragmatic Region with Ropivacaine Reduce the Incidence of Right Shoulder Tip Pain after Laparoscopic Cholecystectomy? A Prospective Randomized, Double-blind, Controlled Study
Volatile organic compounds (VOC) variation in Croton floribundus (L.) Spreng. related to environmental conditions and ozone concentration in an urban forest of the city of SĂŁo Paulo, SĂŁo Paulo State, Brazil
The Development and Use of Individual Learning Plans for Deaf and Hard of Hearing Students in Victoria, Australia
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Migraine-associated common genetic variants confer greater risk of posterior vs. anterior circulation ischemic stroke
To examine potential genetic relationships between migraine and the two distinct phenotypes posterior circulation ischemic stroke (PCiS) and anterior circulation ischemic stroke (ACiS), we generated migraine polygenic risk scores (PRSs) and compared these between PCiS and ACiS, and separately vs. non-stroke control subjects.
Acute ischemic stroke cases were classified as PCiS or ACiS based on lesion location on diffusion-weighted MRI. Exclusion criteria were lesions in both vascular territories or uncertain territory; supratentorial PCiS with ipsilateral fetal posterior cerebral artery; and cases with atrial fibrillation. We generated migraine PRS for three migraine phenotypes (any migraine; migraine without aura; migraine with aura) using publicly available GWAS data and compared mean PRSs separately for PCiS and ACiS vs. non-stroke control subjects, and between each stroke phenotype.
Our primary analyses included 464 PCiS and 1079 ACiS patients with genetic European ancestry. Compared to non-stroke control subjects (n=15396), PRSs of any migraine were associated with increased risk of PCiS (p=0.01–0.03) and decreased risk of ACiS (p=0.010–0.039). Migraine without aura PRSs were significantly associated with PCiS (p=0.008–0.028), but not with ACiS. When comparing PCiS vs. ACiS directly, migraine PRSs were higher in PCiS vs. ACiS for any migraine (p=0.001–0.010) and migraine without aura (p=0.032–0.048). Migraine with aura PRS did not show a differential association in our analyses.
Our results suggest a stronger genetic overlap between unspecified migraine and migraine without aura with PCiS compared to ACiS. Possible shared mechanisms include dysregulation of cerebral vessel endothelial function
Unexpected difficulties in randomizing patients in a surgical trial: A prospective study comparing extracorporeal shock wave lithotripsy with open cholecystectomy
What should I do about my patient's gall stones?
The problem of benign biliary disease is one that causes significant morbidity and social economic strain in the western world. The classical treatment, cholecystectomy, has been challenged by various medical and surgical techniques in a seemingly random nature. The development of the treatment of gall stone disease is reviewed by analysis of published studies over the last 20 years. The advantages and disadvantages are discussed as an overview and summary of the current management of gall stone disease in the light of our knowledge of its malignant potential