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  • 1
    Electronic Resource
    Electronic Resource
    Structure of 2-lithiobenzofuran-tmeda and 2-lithiobenzothiophene-tmeda in the solid state and in solution (1989)
    s.l. : American Chemical Society
    Organometallics 8 (1989), S. 1688-1696 
    Details
    ISSN: 1520-6041
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/om00109a018
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  • 2
    Electronic Resource
    Electronic Resource
    Sleep apnea and pulmonary hypertension (1986)
    Springer
    Journal of molecular medicine 64 (1986), S. 131-134 
    Details
    ISSN: 1432-1440
    Keywords: Sleep apnea ; Pulmonary hypertension
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The pulmonary artery pressure values of 65 patients with sleep apnea syndrome were measured at rest and during ergometer exercise up to 100 W. Pulmonary hypertension at rest was found in 13, and during exercise in 31 more patients. Only 8 patients with pathological pressure findings suffered from pulmonary hypertension in combination with a pulmonary or cardiac disease. In the other 36 patients, no indication of a primary cause of pulmonary hypertension apart from sleep apnea syndrome could be found. Out of the 65 patients, 11 with a finding of more than 20 apnea episodes per hour's sleep underwent polysomnographic recordings in the sleep laboratory. The hemodynamic parameters were continuously measured. All 11 patients had a finding of severe sleep apnea with more than 300 apnea episodes during the night of recording. In 6 patients, the appearance of apnea episodes was accompanied by only moderate changes in pulmonary artery pressure. In 5 patients, there were critical increases in pulmonary artery pressure, which went along with increases in cardiac output and in pulmonary capillary wedge pressure. Increases in pulmonary vascular resistance were established in 3 out of these 5 patients, and a slight decrease in 2. The mechanism of hypoxic vasoconstriction of the pulmonary arteries may account for the pressure increases in 3 of our patients, but fails to explain the findings in the other 2 patients. Nocturnal changes in pulmonary artery pressure in patients with sleep apnea may therefore have different causes. Pulmonary hypertension constitutes a severe complication in patients with sleep apnea. As 55% of all sleep apnea patients were found to suffer from pulmonary hypertension without any indication of a primary pulmonary or cardiac disease, the possibility that pulmonary hypertension results should not be underestimated in patients with suspected sleep apnea syndrome. Measurements of the pulmonary artery pressure must therefore be included in the examination regimen of such patients.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01732637
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  • 3
    Electronic Resource
    Electronic Resource
    Energy balance of ethanol production with a gas-solid fluidized bed fermenter (1989)
    Springer
    Bioprocess and biosystems engineering 4 (1989), S. 123-128 
    Details
    ISSN: 1432-0797
    Source: Springer Online Journal Archives 1860-2000
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract Research on gas-solid fluidized bed fermenters has been performed since the early 1980's. This new type of fermentation system is applicable in the production of volatile substances with inhibiting effects upon the bioreaction and in the production of specific metabolites in a solid-state mode. The fluidized bed fermenter system provides excellent mass and heat transfer and allows fermentation to take place under water-reduced conditions [1]. This paper delivers the theoretical results achieved the production of ethanol by Saccharomyces cerevisiae in a fluidized bed fermentation system including recirculation of the fluidizing gas and coolers for ethanol recovery. The influence of the parameters governing process control, i.e. reactor productivity, ethanol concentration in the gas phase and in the condensate, and the specific energy consumption, are shown. The energy requirement is compared to that of conventional systems for ethanol production.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00369761
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  • 4
    Electronic Resource
    Electronic Resource
    The positron beam at the stuttgart pelletron accelerator and its applications toβ +γ positron lifetime measurements (1987)
    Springer
    Applied physics 43 (1987), S. 261-267 
    Details
    ISSN: 1432-0630
    Keywords: 78.70 ; 61.70 ; 07.77
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract A slow-positron source has been installed in the therminal of an electrostatic 6.5 MeV accelerator and provides a monoenergetic positron beam in the few-MeV range. It will be used to operate a “fast” positron lifetime spectrometer based onβ + γ coincidences. The properties of the beam, the expected performance of the spectrometer, its advantages over conventionalγγ lifetime measurements, a number of intended applications, as well as recent positron-electron scattering experiments and plans for positron channelling and channelling-radiation studies are outlined.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00635181
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  • 5
    Electronic Resource
    Electronic Resource
    Clinical and histopathological considerations for the diagnosis and treatment of verrucous carcinoma of the larynx (1989)
    Springer
    European archives of oto-rhino-laryngology and head & neck 246 (1989), S. 126-132 
    Details
    ISSN: 1434-4726
    Keywords: Keratosis ; Larynx ; Verrucous carcinoma
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Verrucous carcinoma of the larynx is quite distinct from well-differentiated squamous cell carcinoma and has a characteristic morphology and specific clinical behavior. It accounts for approximately l%–2% of all laryngeal carcinomas. However, difficulties are encountered clinically in separating verrucous carcinomas from keratoses, verruca vulgaris and squamous cell carcinomas with a verrucous appearance. Between 1962 and 1982, 1504 patients with squamous cell carcinomas of the larynx were diagnosed and treated by staff physicians in the Department of Otolaryngology — Head and Neck Surgery, Washington University in St. Louis. Fifteen of these patients (1%) had verrucous carcinomas. These cases were studied in order to clarify any diagnostic problems, trace the biologic behavior of the tumors and report the results of the treatment used. Of these 15 patients, we were able to follow up 8. The latter had been treated only with surgery and none of them had received radiotherapy. One death occurred, but the patient died of other causes and remained free of cancer. Reports in the literature describe a high rate of recurrence of verrucous carcinomas following radiotherapy with occasional anaplastic transformation of tumors. No patients in our series developed a metastasis in the neck, indicating that neck dissection is not justified for patients with these neoplasms even though clinically enlarged neck nodes may be present.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00456652
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  • 6
    Electronic Resource
    Electronic Resource
    Modelling a solid-state fluidized bed fermenter for Ethanol production with S. cerevisiae (1987)
    Springer
    Bioprocess and biosystems engineering 2 (1987), S. 25-31 
    Details
    ISSN: 1432-0797
    Source: Springer Online Journal Archives 1860-2000
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract A model is proposed to describe the performance of a new type of fermenter for ethanol production, the fluidized bed gas-solid fermenter, with respect to scaling-up effects. Based on the fact that in the fluid bed the substrate is not supplied continuously to each particle, two scale-up parameters are derived, circulation time τ and specific substrate supply Δm G,P , which are shown to influence reactor efficiency significantly. The validity of the model is checked by comparing the calculated yield coefficients for ethanol, cell mass and carbon dioxide to the results of fermentation experiments performed under aerobic conditions in a laboratory-scale reactor and a semi-technical fermenter.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00369223
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  • 7
    Electronic Resource
    Electronic Resource
    Ultrastructure of infection-thread development during the infection of soybean by Rhizobium japonicum (1985)
    Springer
    Planta 163 (1985), S. 328-349 
    Details
    ISSN: 1432-2048
    Keywords: Glycine (Rhizobium infection) ; Infection thread ; Rhizobium ; Root hair infection ; Symbiosis (legume-Rhizobium)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The location and topography of infection sites in soybean (Glycine max (L.) Merr.) root hairs spot-inoculated with Rhizobium japonicum have been studied at the ultrastructural level. Infections commonly developed at sites created when the induced deformation of an emerging root hair caused a portion of the root-hair cell wall to press against an adjacent epidermal cell, entrapping rhizobia within the pocket between the two host cells. Infections were initiated by bacteria which became embedded in the mucigel in the enclosed groove. Infection-thread formation in soybean appears to involve degradation of mucigel material and localized disruption of the outer layer of the folded hair cell wall by one or more entrapped rhizobia. Rhizobia at the site of penetration are separated from the host cytoplasm by the host plasmalemma and by a layer of wall material that appears similar or identical to the normal inner layer of the hair cell wall. Proliferation of the bacteria results in an irregular, wall-bound sac near the site of penetration. Tubular infection threads, bounded by wall material of the same appearance as that surrounding the sac, emerge from the sac to carry rhizobia roughly single-file into the hair cell. Growing regions of the infection sac or thread are surrounded by host cytoplasm with high concentrations of organelles associated with synthesis and deposition of membrane and cell-wall material. The threads follow a highly irregular path toward the base of the hair cell. Threads commonly run along the base of the hair cell for some distance, and may branch and penetrate into subjacent cortical cells at several points in a manner analagous to the initial penetration of the root hair.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00395142
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  • 8
    Electronic Resource
    Electronic Resource
    Feedback regulation of nodule formation in alfalfa (1988)
    Springer
    Planta 175 (1988), S. 546-557 
    Details
    ISSN: 1432-2048
    Keywords: Feedback regulation (nodulation) ; Medicago ; Nodulation (efficiency, kinetics) ; Rhizobium (mutants)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract When high dosages of wild-type Rhizobium meliloti RCR2011 were inoculated at two different times, 24 h apart, onto either the primary roots of alfalfa (Medicago sativa L.) seedlings or onto lateral roots on opposite sides of a split-root system, the number of nodules generated by the second inoculum was much smaller than the number generated by the first inoculum. These results provide evidence that alfalfa has an active, systemic mechanism for feedback control of nodulation. Non-nodulating mutants and delayed, weakly nodulating mutants did not elicit a discernable suppression of nodulation by subsequently inoculated wild-type cells. An appreciable number of Rhizobium infections thus seem required to elicit the suppressive response. Mutants in nodulation regions IIb and IIa nodulated extensively in the initially susceptible region of the root, but nodule initiation by these mutants was 100–1000 times less efficient, respectively, than the parent. Nodules formed by these mutants emerged 1 d later than normal. The IIb mutants elicited a relatively strong suppression of nodulation in younger parts of the root, but region-IIa mutants elicited only a weak response. These results indicate that elicitation of the regulatory response need not be proportional to nodule formation and imply that genes in region IIa play an important role in elicitation. At high dosages, the region-II mutants induced the development of thick, short roots in a considerably higher percentage of plants than the wild-type bacteria. Nodules generated by wild-type isolates and region-II mutants did not emerge in strict acropetal sequence, probably because some infections developed more slowly than others. Prior exposure of the root to non-nodulating mutants resulted in nodulation by the parent in regions of the root otherwise too mature to be susceptible, indicating that exposure to these mutants may affect the sequence of root development.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00393078
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  • 9
    Electronic Resource
    Electronic Resource
    Evidence for a resonance in positron-electron scattering at 810 keV centre-of-mass Energy (1988)
    Springer
    The European physical journal 330 (1988), S. 173-181 
    Details
    ISSN: 1434-601X
    Keywords: 13.10.+q ; 12.20.Fv ; 14.80.Pb
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A monoenergetic positron (e +) beam (ΔT/T〈5·10−4) from the Stuttgart pelletron accelerator and a 4.6 mg/cm2 Be target has been employed to investigatee + e −scattering in the MeV region in a large solid angle with high statistics by means of a novel positionsensitive detector system. Superimposed on the Bhabha scattering, a structure has been found at ane + kinetic energy of 2263 keV (810 keV excitation energy in thee + e −rest frame). From the energy-integrated resonance cross-section of $$\sigma _{res} \cdot \Gamma _{res}^{e^ + e^ - } $$ ≅30 b·eV (c.m.) and the standard resonance cross-section we estimate partial resonance widths $$\Gamma _{res}^{e^ + e^ - } $$ ≅72 meV or 24 meV for total angular momenta J=0 or J=1, respectively. The structure, which has not been predicted within the framework of quantum electrodynamics, coincides with one of the sum energies of the correlatede + e −lines observed in heavy-ion collisions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01293393
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  • 10
    Electronic Resource
    Electronic Resource
    Experimental limits for narrow lines in the excitation function of positron-electron scattering aroundE *=620 keV andE *=810 keV (1987)
    Springer
    The European physical journal 326 (1987), S. 527-529 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01289559
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