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  • 1
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 83 (1998), S. 3486-3489 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We show that the organic salt 4-N,N-dimethylamino-4′-N′-methyl-stilbazolium tosylate, originally developed for electro-optic applications, is also a very interesting material for phase-matched parametric interactions such as frequency-doubling and optic parametric oscillation in the near infrared. These favorable properties are due to the large off-diagonal element d26 which gives measured effective phase-matchable nonlinear optical coefficients of deff=31±5 and 15±3 pm/V at the telecommunication wavelengths of λ=1313 and 1535 nm, respectively. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-1238
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1432-1440
    Keywords: Key words Human immunodeficiency virus-1 ; Cytotoxic T lymphocyte ; Altered peptide ligand
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The propensity of HIV-1 for genetic variation, a consequence of error-prone reverse transcription combined with high rates of replication, is thought to contribute to the establishment of persistent infection in the host despite the presence of a vigorous antiviral immune response. Protective immunity to viruses is mediated primarily by cytotoxic T lymphocytes, which recognize viral peptides of 8–11 amino acids bound to major histocompatibility complex class I molecules on the surface of infected cells. In this review we examine the mechanisms by which mutation within peptide antigen-encoding regions of the viral genome enables HIV-1 to evade recognition by virus-specific cytotoxic T lymphocytes. The discussion is relevant to other genetically unstable viruses and more generally to intracellular pathogens of variable antigenicity.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1432-0649
    Keywords: 33.00 ; 35.00
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Laser-Induced Fluorescence (LIF) excitation spectra in the NOA–X (0-0) band were used for temperature measurements in the postflame region of high-pressure CH4/air flames. To improve the quality of the measured spectra and to perform reliable line-shape measurements, the initial mixture was doped with approximately 400 ppm NO. At pressures up to 18 bar, excellent agreement was obtained between NO LIF temperatures and NARS/rotational Raman temperatures. Effective broadening coefficients were also determined in these flames. Problems with quantitative concentration measurements of NO and single-pulse temperature measurements at high pressures are discussed.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1433-0407
    Keywords: Schlüsselwörter Normaldruckhydrozephalus ; Infusionstest ; ICP ; Resistance ; Compliance ; Key words Normal pressure hydrocephalus ; Infusion test ; ICP ; Resistance ; Compliance
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary Computer-aided analysis of the results of the intrathecal infusion test using our mathematical computation leads to simplification of this investigation, and therefore normal pressure hydrocephalus is more easily diagnosed. Simultaneous measurement of resistance and compliance during a single investigation allows the exertion of the patients to be minimized. In contrast to classic methods it is not necessary that the ICP reaches a plateau. Our mathematical method diverges with the description of a pressure-dependent slope of the function for the resistance from the static examination models. For that we are able to take the non-linearity of the cerebrospinal fluid resorption into consideration. The intrathecal infusion test is a reliable diagnostic method for measuring resistance and compliance in patients suspected of having normal pressure hydrocephalus.
    Notes: Zusammenfassung Die rechnergestützte Bearbeitung der Ergebnisse des intrathekalen Infusionstests mit dem eigenen Berechnungsverfahren ermöglicht eine Vereinfachung dieser Untersuchungstechnik und damit der Diagnostik eines Normaldruckhydrozephalus. Durch die gleichzeitige Ermittlung von Resistance und Compliance in einem Untersuchungsgang wird die untersuchungsbedingte Patientenbelastung deutlich verringert. Im Gegensatz zu den klassischen Methoden muß sich zur Berechnung der Parameter kein ICP-Plateau ausbilden. Unser Berechnungsverfahren weicht mit der Beschreibung eines druckabhängigen Funktionsverlaufes für den Abflußwiderstand von der statischen Betrachtungsweise ab. Hierdurch wird die Nichtlinearität des zerebrospinalen Resorptionsverhaltens bei der Biosignalverarbeitung berücksichtigt. Der intrathekale Infusionstest stellt zur Messung der Resistance und Compliance eine verläßliche diagnostische Methode bei Patienten mit einem Normaldruckhydrozephalus dar.
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 0942-0940
    Keywords: Keywords: Compliance; infusion test; normal pressure hydrocephalus; resistance.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary  The internationally accepted calculation methods concerning cerebrospinal fluid dynamics proceed from a pressure independent resistance to cerebrospinal fluid outflow. In a new model we focus our attention on the pressure dependency of resistance. In our calculation model we are monitoring the complete pressure course p(t) over the time during and after the infusion. The comparison of the pressure rise On(p) during the infusion and the descent Off(p) after the infusion at the same pressure level allows one to construct all formulas for the compliance C(p) and resistance R(p). The computerized analysis of the results of the intrathecal infusion test using our mathematical computation leads to a simplification of this investigation. The simultaneous measurement of the resistance and compliance during a single investigation allows one to minimize the patient's discomfort. In contrast to the classical methods it is not necessary that the ICP reaches a plateau.  Our mathematical method diverges with the description of a pressure dependent slope of the function for the resistance from the static examination models. For that we are able to take the non-linearity of the cerebrospinal fluid resorption into consideration.
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Acta neurochirurgica 141 (1999), S. 1039-1048 
    ISSN: 0942-0940
    Keywords: Keywords: Normal pressure hydrocephalus; cerebral atrophy; infusion test; resistance; shunt.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary  Between May 1982 and January 1997 we investigated 200 patients for normal pressure hydrocephalus (NPH) by performing an intrathecal infusion test. 168 patients (84%) presented with the clinical syndrome of gait ataxia, dementia and urinary incontinence, the so called Adams triad. In 107 patients (54%) the diagnosis of a NPH could be confirmed. Of these, 102 patients (95%) underwent a shunt operation. In a follow-up (7 month and 3 years later) we interviewed the patients or their relatives about the progression of the disease. At those time intervals we could evaluate the improvement after shunt operation or infusion test. In our experience gait ataxia is the guiding sign of NPH. Regarding dementia we could not find a significant difference compared to cerebral atrophy. Urinary incontinence can be characterized as a symptom of late stage NPH. The complete Adams triad should not be overestimated in differential diagnostic considerations. Subdivision of NPH into an early stage and a late stage allows one to conclude prognostic evaluations about the course of the disease. Patients with an early stage NPH reported at the follow-up an improvement of their symptoms after shunt operation in 65 percent and those with a late stage NPH in 50 percent. The computer aided infusion test allows a safe differentiation between patients with NPH and those with cerebral atrophy.
    Type of Medium: Electronic Resource
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  • 8
    ISSN: 1432-0886
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract . The subcellular location of several nonribosomal nucleolar proteins was examined at various stages of mitosis in synchronized mammalian cell lines including HeLa, 3T3, COS-7 and HIV-1 Rev-expressing CMT3 cells. Nucleolar proteins B23, fibrillarin, nucleolin and p52 as well as U3 snoRNA were located partially in the peripheral regions of chromosomes from prometaphase to early telophase. However, these proteins were also found in large cytoplasmic particles, 1–2 μm in diameter, termed nucleolus-derived foci (NDF). The NDF reached maximum numbers (as many as 100 per cell) during mid- to late anaphase, after which their number declined to a few or none during late telophase. The decline in the number of NDF approximately coincided with the appearance of prenucleolar bodies and reforming nucleoli. The HIV-1 Rev protein and a mutant Rev protein defective in its nuclear export signal were also found in the NDF. The mutant Rev protein precisely followed the pattern of localization of the above nucleolar proteins, whereas the wild-type Rev did not enter nuclei until G1 phase. The nucleolar shuttling phosphoprotein Nopp140 did not follow the above pattern of localization during mitosis: it dispersed in the cytoplasm from prometaphase through early telophase and was not found in the NDF. Although the NDF and mitotic coiled bodies disappeared from the cytoplasm at approximately the same time during mitosis, protein B23 was not found in mitotic coiled bodies, nor was p80 coilin present in the NDF. These results suggest that a class of proteins involved in preribosomal RNA processing associate with chromosome periphery and with NDF as part of a system to conserve and deliver preexisting components to reforming nucleoli during mitosis.
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Langenbeck's archives of surgery 384 (1999), S. 194-199 
    ISSN: 1435-2451
    Keywords: Key words Colorectal carcinoma ; Multivisceral extended resection
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Background and aims: In about 10% of patients with carcinoma of the colorectum, the tumour has already invaded contiguous organs or else inflammatory tumorous adhesions involving neighbouring structures are found. In such a situation, the question arises whether one should perform a multivisceral resection, the usefulness of which in terms of surgical risk and late oncological results have been investigated in the present study. Patients and methods: A total of 173 patients with colorectal carcinoma who underwent a multivisceral resection during the period between 1984 and 1995 are reported. Excluded from the study were patients with recurrent tumour or distant metastases. Results: In the majority of cases (63%), the primary tumour originated in the sigmoid colon or rectum. In 102 patients, only a single neighbouring organ was additionally involved, while the remaining patients had involvement of two or more contiguous organs. In 140 patients, the resection was curative, while in the remaining patients an R1/2 situation presented. In the curative group, tumour infiltration was confirmed histologically in 55% of the cases, while in the remaining patients a peritumourous adhesion had mimicked tumour invasion. Postoperative surgical complications occurred in only 1.4% of the interventions, a figure identical to the incidence of complications seen with conventional limited operations. The same applied to the postoperative 30-day mortality rate of 3.6%. The 5-year survival rate of the overall group of patients undergoing multivisceral resection was 42%, that of the subgroup undergoing curative surgery was 51%, and that of the subgroup receiving only palliative resection was 0%. Calculation of the stage-related 5-year survival rates for Union Internationale Contra la Cancrum stage-II and stage-III tumours revealed figures of 58% and 43%, respectively. After non-extended resection, the respective survival rates were identical (60% and 41%). Conclusion: An identical surgical risk and survival rates for curative resection, equally as good as those seen with conventional, non-extended procedures, justify the liberal use of multivisceral resection in the surgical treatment of colorectal carcinomas directly invading neighbouring organs.
    Type of Medium: Electronic Resource
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  • 10
    ISSN: 0941-1216
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Several new push-pull azobenzene dyes were synthesized by diazonium salt coupling of electron-poor anilines with N,N-dialkylanilines. Their dipole moments and first-order hyperpolarizabilities were evaluated respectively from the concentration dependence of the dielectric constant of solutions in apolar solvents and by the electric-field-induced-second-harmonic-generation (EFISH) technique. Investigation of the influence of both nature and steric hindrance of the electron-withdrawing group allowed to highlight a significant deviation from linearity in the relationship between dipole moments and first-order hyperpolarizabilities. This effect was particularly noticeable when multiple electron withdrawing groups pointing in different directions were present on the same phenyl ring.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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