GLORIA

GEOMAR Library Ocean Research Information Access

feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 86 (1999), S. 4635-4642 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Field emission characteristics have been investigated for P-doped polycrystalline diamond films. It is demonstrated that the turn-on voltage of the electron emission decreases with increasing temperature for the P-doped diamond film, while no variation in the turn-on voltage occurs for the undoped diamond film. The temperature-dependent field emission characteristics are found to be inherent to the P-doped diamond film. A behavior of the field emission characteristics can be well explained by means of the thermionic field emission model combined with the temperature dependence of the ionized donor concentration. This means that an increase of the ionized donor concentration with increasing temperature may lead to a reduction in the tunnel barrier width at the interface between the diamond and the cathode, resulting in an enhancement of the internal emission current. It is suggested that the internal electron emission is important to the field emission characteristics of the P-doped diamond films. A variation in the field emission characteristics of P-doped diamond films with various cathode metals and with various P-doping concentrations can be consistently understood on the basis of the internal electron emission model. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
  • 2
    ISSN: 1523-5378
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Background. Phospholipids concentration in the gastric mucosa decreased in patients with Helicobacter pylori infection. The aim of this study is to examine the effects of eradication of H. pylori on decreasing the phospholipids concentration in the gastric mucosa in patients with gastric or duodenal ulcer.Materials and Methods. Phospholipids (phosphatidylcholine, phosphatidylethanolamine, and sphingonomyeline) were measured in biopsy specimens from the antrum and corpus using thin-layer chromatography. In H. pylori positive patients with gastric ulcer (n = 26) and duodenal ulcer (n = 13), and H. pylori negative controls (n = 20), the biopsy specimens were obtained before and 3 months after eradication. Eradication was performed using lansoprazole, amoxycillin, and clarithromycin.Results. Compared with the H. pylori negative control group, the concentrations of phosphatidylcholine and phosphatidylethanolamine decreased significantly in the gastric ulcer group in both antrum and corpus mucosa, and in the duodenal ulcer group in antrum mucosa. This decrease returned to the control level after eradication.Conclusions. This study demonstrates that the eradication of H. pylori in patients with peptic ulcer normalized the decrease of phosphatidylcholine and phosphatidylethanolamine in the gastric mucosa.
    Type of Medium: Electronic Resource
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
  • 3
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 73 (1998), S. 268-270 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Temperature dependence of the field emission characteristics is investigated for the phosphorus(P)-doped polycrystalline diamond film in comparison with that of the boron(B)-doped one. The threshold voltage decreases with increasing temperature for the P-doped diamond film, while no variation in the threshold voltage occurs for the B-doped diamond film. It is considered that an increase of the ionized donor concentration with increasing temperature leads to a reduction in the tunnel barrier width at the interface between the diamond and the cathode, resulting in an enhancement of the emission current. Field emission characteristics in the higher voltage region are featured by the space charge limited current. The activation energy estimated from the Arrhenius plot of the emission current suggests the upward band bending at the diamond surface. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
  • 4
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 71 (1997), S. 2704-2706 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Electron emission characteristics of sulfur (S)-doped boron nitride (BN) films synthesized by plasma-assisted chemical vapor deposition (PACVD) are investigated. The BN film consists of hexagonal grains of 3 nm in size. The energy gap is estimated to be as wide as 6.0 eV from ultraviolet-visible optical transmission measurement. The electrical resistivity is reduced to 4.9×102 Ω cm. Si tip field emitters coated with the BN film are fabricated. The electron emission occurs at an electric field as low as 6 V/μm, while a high electric field of 20 V/μm is needed to emit electrons from the Si tip array without BN coating. It is deduced that the tunneling barrier height of 0.1 eV exists at the surface of the BN film. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
  • 5
    ISSN: 1530-0358
    Keywords: Harmonic Scalpel™ ; Abdominoperineal resection ; Rectal carcinoma ; Rectal surgery ; Surgical technique
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract We describe a technique of open abdominoperineal resection with the use of the Harmonic Scalpel™ in seven patients. Using this instrument we dissected all pelvic vessels, including the middle hemorrhoidal artery, with no subsequent bleeding. In addition, we divided the levator animuscles completely in the abdominal procedure alone.
    Type of Medium: Electronic Resource
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Journal of hepato-biliary-pancreatic surgery 3 (1996), S. 164-166 
    ISSN: 1436-0691
    Keywords: portocaval shunt ; rat ; method
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract We devised a new technique for the placement of portacaval shunts in rats. Using a Teflon tube with a commercially available puncture needle, we placed the tube between the infrarenal inferior vena cava (IVC) and the main portal branch. An upper laparotomy was performed, after which the tube attached to the needle was used to puncture the IVC from the right dorsal wall through toward the left side. Subsequently, the needle was advanced further to puncture the main portal vein. After each end of the tube had been successfully placed in the lumina of the IVC and portal vein, the needle was gently pulled out. Bleeding was controlled by compressing the puncture site gently for approximately 30s. Seven shunts out of ten were found to be patent at second laparotomies carried out 1 week after the primary tubing operation. The remaining three were occluded with white and red thrombi. No dislodging of the tube was noted, and radiography confirmed the patency of the shunt. This method is fast and simple, and yields a high patency rate, even in the hands of relatively inexperienced surgeons. It can be recommended as an experimental model for additional studies.
    Type of Medium: Electronic Resource
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Journal of hepato-biliary-pancreatic surgery 6 (1999), S. 23-29 
    ISSN: 1436-0691
    Keywords: Key words: multiple hepatic metastases ; colorectal carcinoma ; liver resection ; intraoperative ultrasound ; preoperative portal vein embolization
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract: We describe the treatment strategy for multiple hepatic metastases of colorectal carcinoma based on a review of the literature and our own results. Although a number of studies have suggested that multiplicity or bilobar distribution of metastases is associated with poor outcome, liver resection is thought to be the only potentially curative treatment. The only contraindications to surgery are the presence of extrahepatic metastases (with the exception of resectable lung metastases) and if radical removal of all detectable tumors is not possible. Hepatectomy should be performed with the aim of maintaining a delicate balance between radical removal of tumors and the preservation of as much residual hepatic mass as possible with minimal blood loss. Surgeons should be familiar with the use of intraoperative ultrasonography, a standard adjunct to liver resection. Preoperative portal vein embolization may be indicated in selected patients as a means of inducing hypertrophy in the remaining hepatic parenchyma.
    Type of Medium: Electronic Resource
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
  • 8
    ISSN: 1432-2323
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract. In patients with advanced biliary malignancies a chance of curability is obtained by performing only major hepatectomy with concomitant pancreatoduodenectomy. This aggressive procedure carries two major risks: hepatic failure and pancreatic anastomotic leakage. Ten patients with advanced biliary malignancies were treated by major hepatectomy with pancreatoduodenectomy. Nine patients underwent right portal venous embolization before hepatectomy. Complete external drainage of pancreatic juice followed by second-stage pancreatojejunostomy was performed in five patients. Three of these five underwent concomitant resection of the hepatic artery, portal vein, or both. Pancreatogastrostomy was chosen for five patients who required no concomitant vascular resection. There were no hospital deaths or hepatic failures. Leaks from pancreatogastrostomy occurred in two patients. In five patients who underwent external drainage of pancreatic juice, there were no complications related to the pancreatic stump, although one had ischemic necrosis of the jejunal segment and laparotomy was repeated. Mean survival time was 31.8 months (range 13–59 months). Portal venous embolization and complete external drainage of pancreatic juice followed by late stage pancreatojejunostomy are recommended surgical procedures for patients undergoing major hepatectomy with pancreatoduodenectomy, especially when concomitant vascular resection is required for curative resection of the tumor in patients with a soft pancreatic parenchyma and thin pancreatic duct.
    Type of Medium: Electronic Resource
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
  • 9
    ISSN: 1432-2323
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Résumé Les résultats de 122 résections hépatiques chez 112 patients ayant un carcinome hépatocellulaire (CHC) sont décrits. Le type de résection a été choisi selon la fonction hépatique. Quarante neuf patients ont eu une résection anatomique y compris un cas de trisegmentectomie, cinq lobectomies, 11 segmentectomies, et 32 sous segmentectomies; les 63 autres patients ont eu une résection non anatomique. Les survies à 1, 2 et 3 ans après résection hépatique pour tous les patients, en tenant compte d'un décès hospitalier et d'un décès préopératoire (0.9%), ont été de 92%, 85% et de 78.9% alors que la survie sans tumeur a été de 68.6%, de 46.2% et de 32.6%, respectivement. Vingt et une résections secondaires ont été réalisées (17.2% au total des 122 résections) sans mortalité hospitalière. La survie cumulative depuis le moment de la deuxième résection chez ces 21 patients a été de 84.2% et de 56.3% à 1 et à 2 ans, respectivement. Parmi les facteurs influençant la survie sans tumeur, il faut noter l'absence d'envahissement vasculaire (p〈0.05) et l'absence de métastases hépatiques (p〈0.001). L'évolution après résection pour CHC est bonne grâce à une indication appropriée, un suivi rigoureux et une attitude thérapeutique agressive en cas de récidive.
    Abstract: Resumen Se describen los resultados de 122 resecciones hepáticas en 112 pacientes con carcinoma hepatocelular. El tipo de resección efectuado se seleccionó con base en el estado de la función hepática. Cuarenta y nueve pacientes tuvieron resección anatómica, incluyendo una trisegmentectomía, 5 lobectomías, 11 segmentectomías y 32 subsegmentectomías, y los 63 pacientes restantes tuvieron resecciones no anatómicas. Las tasas de sobrevida a 1, 2 y 3 años luego de resección hepática, teniendo en consideración una muerte operatoria y una muerte hospitalaria (0.9% cada una) fuerin 92.4%, 85% y 78.9%, en tanto que las tasas de sobrevida libre de enfermedad a 1, 2 y 3 años fueron 68.6%, 46.2% y 32.6%, respectivamente. Se realizaron 21 resecciones hepáticas repetidas (17.2% del total de las 122 resecciones) sin mortalidad hospitalaria. La tasa acumulada de sobrevida desde el momento de la nueva hepatectomía en estos 21 pacientes fue 84.2% y 56.3% a 1 y 2 años, respectivamente. Entre los factores que pueden afectar la sobrevida o el intervalo libre de enfermedad, la ausencia de invasión vascular (p〈0.05) y las metástasis intrahepáticas (p〈0.01) aparecieron significativamente relacionadas con el intervalo libre de enfermedad. Se demuestra un buen resultado luego de la resección hepática en 112 pacientes con carcinoma hepatocelular mediante una escogencia apropiada del tipo de resección, un seguimiento cuidadoso y un vigoroso aproche quirúrgico en presencia de recurrencia.
    Notes: Abstract The results of 122 hepatic resections in 112 patients with hepatocellular carcinoma are described. The type of liver resection performed was selected according to the patient's liver function. Forty-nine patients underwent anatomic resections, including 1 trisegmentectomy, 5 lobectomies, 11 segmentectomies, and 32 subsegmentectomies; the remaining 63 patients had nonanatomic resections. The 1-, 2-, and 3-year survivals after liver resection for all patients, taking into account one operative and one hospital death (0.9% each), were 92.4%, 85.0%, and 78.9%, and disease-free survivals at 1, 2, and 3 years were 68.6%, 46.2%, and 32.6%, respectively. Twenty-one repeat hepatic resections (17.2% of the total of 122 resections) were performed with no hospital mortality. Cumulative survival from the time of repeat hepatectomy in these 21 patients was 84.2% and 56.3% at 1 and 2 years, respectively. Among the factors that may affect survival or disease-free survival, the absence of vascular invasion (p〈0.05) and intrahepatic metastases (p〈0.01) were significantly related to the disease-free survival time. A good outcome was obtained after liver resection in 112 patients with hepatocellular carcinoma through appropriate choice of the type of resection, careful follow-up, and a vigorous surgical approach for recurrence.
    Type of Medium: Electronic Resource
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
  • 10
    ISSN: 1437-7780
    Keywords: Key words Vancomycin hydrochloride (VCM) ; Impaired liver function ; Pharmacokinetics ; Protein binding
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Infections caused by methicillin-resistant Staphylococcus aureus pose a serious problem postoperatively. Patients with hepatic dysfunction can be considered to be more susceptible to infection. Since little is known about the effects of the severity of hepatic dysfunction on the pharmacokinetics of vancomycin, we studied the pharmacokinetics of vancomycin in preoperative patients with hepatic dysfunction, after the intravenous infusion of 500 mg. In patients with liver disease and normal renal function, an enhancement of renal clearance caused by a reduction in percent protein binding was canceled out by a reduction in non-renal clearance caused by liver dysfunction, resulting in liver disease having no effect on the total clearance of the drug. In patients with impaired liver and renal functions and/or obstructive jaundice, the unbound fraction of vancomycin increased, whereas the renal excretion of vancomycin was delayed. It should be noted that an excessive increase in blood vancomycin concentration may be brought about even with a conventional dose in patients with hepatic dysfunction.
    Type of Medium: Electronic Resource
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...