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  • 1
    ISSN: 1588-2837
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Abstract Металлический палладий, нанесенный на смолу, был приготовлен из [Pd(NH3)4]-формы сульфосмолы обработкой H2. Адсорбция CO и равновесная реакция H2-D2 были значительно промотированы обработкой при температуре выше 373 К, когда Pd(II) восстанавливается до Pd(0), как об этом свидетельствуют РФЭС исследования. Скорость реакции имеет порядок 2, 5 по отношению к металлическим центрам.
    Notes: Abstract Resin supported palladium metal was prepared from [Pd(NH3)4]-form sulfonic resin by treatment: with H2. The CO adsorption and H2-D2 equilibration reaction were greatly promoted by treatment above 373 K where Pd(II) was reduced to Pd(O) as indicated by XPS study. The reaction rate is of the 2.5th order with respect to the metal sites.
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  • 2
    ISSN: 1588-2837
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Abstract Каталитические свойства катионов металлов на сульфоновых смолах исследовали в гидролизе эфиров. Каталитическую активность связывали с электроотрицательностью катиона металла. Полученная энергия активации почти одинакова с энергией активации Н-формы смолы и не зависит от концентрации катиона. Это приводит к тому заключению, что в катализе изменяются энтропийные факторы.
    Notes: Abstract Catalytic properties of metal cations on sulfonic resin have been studied in ester hydrolysis. The catalytic activities were related to the electronegativity of the metal cation, while the activation energies were close to that for H-form resin and not affected by the cation concentration, suggesting the variation of entropy factors in catalysis.
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  • 3
    ISSN: 1434-4726
    Keywords: Hearing disorders ; Inner ear microcirculation ; Thromboxane A2 synthetase inhibitor ; Thromboxane A2 receptor antagonist disorder
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Since thromboxane (TX) A2 causes vasoconstriction and platelet aggregation, we evaluation the effect of a TXA2 receptor antagonist (vapiprost) and a TXAZ synthetase inhibitor (Y-20811) on a microcirculation disorder in the rat inner ear that was induced by a photochemical reaction between an intravenous injection of rose bengal (RB) and green light. A gradual decrease of the cochlear action potential (CAP) to an 8 kHz sound stimulus was measured with an electrocochleogram and occurred after the RB injection. The CAP then disappeared 5 min after the injection of RB. Both vapiprost and Y-20811 significantly prolonged the time required to complete suppression of the CAP as compared with saline as control. These findings indicate that TXAZ may play an important role in microcirculation disorders in the rat inner ear.
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  • 4
    ISSN: 1434-4726
    Keywords: Inner ear microcirculation ; Photochemically induced vascular thrombosis ; Rose bengal ; Hearing loss
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary A new photochemical method was employed to cause disorders in the inner ear's microcirculation, using the rat as an animal model. Hearing loss was used as a measure for establishing the altered microcirculation. Under pentobarbital anesthesia, the middle ear was opened by a ventral approach. The lateral wall of the cochlea was then illuminated with a filtered xenon lamp (wavelength 540 nm) while rose bengal was infused intravenously. Photoactivated rose bengal produces oxygen radicals and oxygen singlets, which subsequently damage the vascular epithelium to cause the adhesion and aggregation of platelets in the small vessels. Disintegration of the inner ear hair cells at the irradiated site became evident 24 h after the illumination. These findings further suggest that the photochemical occlusion in the inner ear's microcirculation led to ischemic damage of the stria vascularis and the hair cells in the inner ear. When the action potential (AP) of the cochlea was measured with an electrocochleogram a gradual decrease occurred after the illumination. When acetylsalicylic acid was injected intravenously before treatment, the time required to completely suppress the AP was prolonged in a dose-dependent manner. Findings indicate that our method causes a photochemically induced occlusion in the inner ear's microcirculation and is therefore potentially useful for evaluating the various effects of drugs on the ear.
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  • 5
    ISSN: 1434-4726
    Keywords: Microcirculation ; Inner ear ; Photochemically induced thrombosis ; Equilibrium dysfunction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary A new photochemical method was employed to damage the inner ear microcirculation in the rat. Under pentobarbital anesthesia, the middle ear was exposed by a ventral approach and the tympanic membrane and the malleus and incus were removed. The vestibule was then illuminated by a filtered xenon light (wave length: 540 nm) while rose bengal was infused intravenously. Microscopic examination revealed disintegration of the hair cells in the vestibule. Changes could be prevented by pretreatment with intravenous acetylsalicylic acid (ASA) or heparin. Twenty-four hours after the completion of photo-illumination the rats exhibited nystagmus toward the intact ear and showed rolling during the swimming test, both signs of equilibrium dysfunction. These findings were inhibited by ASA or heparin pretreatment. Our present results indicate that our method causes a photochemically induced occlusion in the rat's inner ear microcirculation and may be useful for evaluating the various effects of drugs on the inner ear.
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  • 6
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 74 (1993), S. 7114-7117 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We present a new doping technique using an ion shower doping system with a bucket ion source. Phosphorus atoms were implanted in polycrystalline silicon from room temperature to 300 °C. Sheet resistances were significantly reduced by raising the implantation temperature. With a crystal fraction of 85%, sheet resistance was 5×102 S−1/(D'Alembertian) as implanted. These effects were not due to pure thermal annealing by ion beam heating. A significant improvement was found in sheet resistance as a result of averaging the impurity profile by radiation enhanced diffusion and low temperature recrystallization of the implanted region by collision of atoms.
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  • 7
    ISSN: 1432-1041
    Keywords: Thromboxane synthase inhibitor ; CS-518 ; 11-dehydrothromboxane B2 ; enzyme immunoassay ; thromboxane B2
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary When 50 mg CS-518, a novel thromboxane (TX) A2 synthase inhibitor, was orally administered to healthy male volunteers, the plasma concentration of CS-518 peaked after 0.5 h and then decreased with a half-life of 0.44 h. There was no significant change in the plasma concentration of circulating TXB2, whereas that of circulating 11-dehydrothromboxane B2 (11-dhTXB2), an enzymatic metabolite of TXB2, was significantly decreased from 0.5 h to 24 h after administration; the maximal decrease to about 25% of the pre-dose value was found at 6 h. After CS-518 100 mg b.d. for 4.5 days, plasma 11-dhTXB2 was suppressed to the same extent as after the single dose of 50 mg from 6 h after the initial dose throughout the administration period. The urinary excretion of 11-dhTXB2 corrected for the creatinine level was significantly decreased by 70–84% throughout the treatment. These results suggest that CS-518 causes long-lasting inhibition of TXA2 synthase despite its rapid elimination from plasma, and that circulating 11-dhTXB2 in plasma and its urinary excretion can serve as a quantitative index of TXA2 synthase inhibition in vivo by CS-518.
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  • 8
    ISSN: 1432-2218
    Keywords: Key words: Paraduodenal hernia — Laparoscopic repair — Small bowel
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract. Paraduodenal hernias have traditionally been treated by conventional laparotomy. We report the first case of a left paraduodenal hernia treated laparoscopically. A 44-year-old man was admitted with abdominal pain and nausea. Computed tomography and an upper gastrointestinal series with small-bowel followthrough showed accumulation of the small bowel on the left side of the abdomen. A laparoscopic repair was performed. The small bowel was observed beneath a thin hernia capsule. Approximately 1.5 m of jejunum was easily reduced into the abdominal cavity. The hernia orifice (5-cm diameter) was closed intracorporeally with five interrupted sutures. Good exposure of the operative field is critical to this procedure; poor exposure may limit the applicability of the laparoscopic approach. This minimally invasive operation is currently indicated in nonobstructive paraduodenal hernias, especially on the left.
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  • 9
    ISSN: 1046-5928
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Medicine
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Carbohydrate Research 5 (1967), S. 479-481 
    ISSN: 0008-6215
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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