Conservation Laws in a First Order Dynamical System of Vortices

Gauge invariant conservation laws for the linear and angular momenta are studied in a certain 2+1 dimensional first order dynamical model of vortices in superconductivity. In analogy with fluid vortices it is possible to express the linear and angular momenta as low moments of vorticity. The conservation laws are compared with those obtained in the moduli space approximation for vortex dynamics.Comment: LaTex file, 16 page

Quantum vortices in systems obeying a generalized exclusion principle

The paper deals with a planar particle system obeying a generalized exclusion principle (EP) and governed, in the mean field approximation, by a nonlinear Schroedinger equation. We show that the EP involves a mathematically simple and physically transparent mechanism, which allows the genesis of quantum vortices in the system. We obtain in a closed form the shape of the vortices and investigate its main physical properties. PACS numbers: 03.65.-w, 03.65.Ge, 05.45.YvComment: 7 pages, 4 figure

Segmental resection of the duodenum for gastrointestinal stromal tumor (GIST)

<p>Abstract</p> <p>Background</p> <p>Gastrointestinal stromal tumors (GIST) are the most frequent mesenchymal tumors of the gastrointestinal tract. The biological appearance of these tumors reaches from small lesions with benign appearance to aggressive sarcomas. Only 3–5% of GISTs are localized in the duodenum. There is a controversy, if duodenal GISTs should be treated by a duodenopancreatectomy or by a limited resection of the duodenum.</p> <p>Case presentation</p> <p>A 29-year-old man presented with an acute upper gastrointestinal bleeding from a submucosal tumor located in the proximal part III of the duodenum, 3 cm distal of the papilla of Vater. After an emergency laparotomy with ligation of tumor-feeding vessels in a primary hospital, definitive surgical therapy was performed by partial resection of the duodenum with a duodenojejunostomy. Histology revealed a GIST with a diameter of 2.5 cm and <5 mitoses/50 high power fields, indicating a low risk of malignancy. Therefore no adjuvant therapy with Imatinib was initiated.</p> <p>Conclusion</p> <p>GISTs of the duodenum are a rare cause of upper gastrointestinal bleeding. Partial resection of the duodenum is a warranted alternative to a duodenopancreatectomy, as this procedure has a lower operative morbidity, while providing comparable oncological results.</p

Changes in liver histology accompanying massive weight loss after gastroplasty for morbid obesity

Background: Nonalcoholic steatohepatitis (NASH) is common in morbid obesity. Our goal was to evaluate the alterations in liver histology and biochemistry before and after weight loss in 51 morbidly obese patients following Mason&apos;s vertical banded gastroplasty. Methods: Two biopsies were performed (on entry and after an average of 18 months), while 16 of these subjects had a third biopsy 17 months after the second. Results: On entry, steatosis and steatohepatitis (mostly grade 3) were present in 98.0% and fibrosis (mostly stage 2) in 94.1% of the subjects. After an excess weight loss of 66%, steatosis and steatohepatitis improved significantly (P&lt;0.001). Although a significant overall decrease in fibrosis occurred (P=0.002), 21 patients (41.1%) did not change and only 6 patients (11.7%) increased in fibrosis. None developed cirrhosis. The decrease in steatohepatitis was significantly correlated (P=0.011 ) with the reduction of BMI. Fasting serum glucose, lipids, lipoproteins, transaminases, gamma-glutamyl transpeptidase, alkaline phosphatase and fibrinogen were also significantly improved at the time of the second biopsy. The third biopsy performed in 16 of the subjects showed further significant improvement in liver histology. Conclusion: NASH improved significantly with massive weight loss in non-diabetic, non-alcoholic, morbidly obese subjects, while fibrosis improved in nearly half of the patients. © FD-Communications Inc