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  • 1
    Electronic Resource
    Electronic Resource
    Infratemporal approaches to nasopharyngeal tumors (1997)
    Springer
    European archives of oto-rhino-laryngology and head & neck 254 (1997), S. S165 
    Details
    ISSN: 1434-4726
    Keywords: Infratemporal fossa ; Skull base ; Nasopharyngeal tumors ; Subtemporal surgical approach
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Twenty patients with neoplasms originating in the nasopharynx were operated using the infratemporal fossa approach with facial translocation (15 cases), the subtemporal-preauricular infratemporal approach (2 cases), and the transmandibular approach (3 cases). A craniectomy was also required in 14 cases. Fifteen tumors were malignant, while 5 were juvenile angiofibromas with infratemporal and intracranial extensions. Most of the lesions were large and involved multiple areas of the skull base. Tumor excision was total in all but 3 patients. Local flaps were utilized in all patients to seal the operative cavity and consisted of temporalis muscle flaps. The most frequent postoperative complications were wound infections and cerebrospinal leaks. Two patients died as a result of postoperative complications. To date, 1 patient has died from disease and 3 are alive with local or distant disease.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02439752
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  • 2
    Electronic Resource
    Electronic Resource
    Effect of high frequency oscillatory ventilation on fluid filtration rate in isolated perfused rabbit lungs (1989)
    Springer
    Intensive care medicine 15 (1989), S. 155-159 
    Details
    ISSN: 1432-1238
    Keywords: High frequency oscillatory ventilation ; Fluid filtration rate ; Ventilatory frequency ; Hydrostatic lung oedema ; Isolated perfused rabbit lung
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract We have studied the effect of changing ventilatory frequency (VF) of high frequency oscillatory ventilation (HFOV) on fluid filtration rate (FFR) in twelve isolated rabbit lungs perfused at constant blood flow. Mean pulmonary artery pressure (Ppa), mean left atrial pressure (Pla), airway pressure (Paw), pulmonary vascular resistance (PVR), pH, O2 and CO2 partial arterial pressures (PaO2 and PaCO2) and plasma colloid osmotic pressure (COP), were measured. We ventilated the lungs with a modified Bird Mark 7 ventilator which could achieve HFOV (range 5–30 Hertz). In each experiment VF was randomly varied on ten different occasions, maintaining each variation for ten minutes. The first group of six rabbits was ventilated under normal haemodynamic conditions. The other six rabbits were ventilated after the production of hydrostatic lung oedema. Blood gas exchange in both groups of rabbits was satisfactory. There was no statistically significant correlation between VF and FFR. We conclude that variations in VF using HFOV does not alter lung fluid balance in normal and in hydrostatic oedema rabbit lungs.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01058566
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  • 3
    Electronic Resource
    Electronic Resource
    The effects of graded administration of positive end expiratory pressure on the fluid filtration rate in isolated rabbit lungs, using normal lungs, hydrostatic oedema lungs and oleic acid induced oedema (1990)
    Springer
    Intensive care medicine 16 (1990), S. 89-94 
    Details
    ISSN: 1432-1238
    Keywords: Fluid filtration rate ; Positive end expiratory pressure ; Lung oedema
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The influence of positive end expiratory pressure (PEEP) on the fluid filtration rate (FFR) in the pulmonary circulation has been the subject of considerable investigation but data are conflicting. We studied twentynine isolated rabbit lung preparations, FFR was sensed by a force transducer. Autologous blood was used to prime the perfusion circuit. Hydrostatic oedema was achieved by increasing the left atrial pressure to 16 mmHg. In order to bring about increased membrane permeability oleic acid was injected through the pulmonary artery. Increasing and decreasing levels of PEEP at 0, 5, 10 and 15 cm H2O were each used for ten minutes in each of three experimental models. The FFR, pH, mean pulmonary arterial pressure (MPAP), mean left atrial pressure (MLAP), PaO2, PaCO2 and oncotic pressure were measured in each experiment. There was a significant correlation between PEEP and FFR (+0.94) in non-oedema lungs. With no PEEP the FFR was 0 g/min and with 15 cm of PEEP it increased to 0.07 g/min, on removing the PEEP the FFR returned to 0 g/min. In the hydrostatic lung oedema model the correlation was also significant but negative (r=−0.94). With no PEEP the FFR was 0.33 g/min, with PEEP of 15 cm H2O it decreased to 0.08 g/min. No correlation between PEEP and FFR was found in the oleic acid preparation. In the normal lung PEEP increases capillary hydrostatic pressure and total lung vascular area and decreases interstitial pressure. It is by these mechanisms that PEEP causes an increase in FFR. In the hydrostatic oedema model PEEP decreases FFR by increasing the interstitial pressure and by decreasing the total lung vascular area. In the oleic acid preparation the coefficient of filtration is so large that small changes in pressure or vascular area do not modify the FFR. We suggest that PEEP may be beneficial by decreasing FFR in hydrostatic lung oedema, but it may increase the FFR in the normal lung, while having no effect in oleic acid lung injury.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01699852
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  • 4
    Electronic Resource
    Electronic Resource
    Three species of Heilipodus (Coleoptera, Curculionidae) with different karyotypes and sex chromosome systems (1987)
    Springer
    Genetica 75 (1987), S. 213-218 
    Details
    ISSN: 1573-6857
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract This work includes the cytological studies of three species of Heilipodus (Coleoptera, Curculionidae, Molytinae, Hylobiini) that live on plants of the genus Eryngium (Umbelliferae). The three have the same chromosome number (2n=30), but differ in the morphology of their autosomes and in their sex chromosomes. All specimens of Heilipodus erythropus (Klug) showed a typical parachute-like sex bivalent, some individuals of Heilipodus sp. possessed either a simple Xyp or a sex multivalent involving a telocentric autosomal pair and the parachute bivalent. Finally, Heilipodus scabripennis (Klug) has multiple sex chromosomes neoXpneoX-neoYyp.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00123576
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  • 5
    Electronic Resource
    Electronic Resource
    Comparison of the areal amount of chlorophyll a of planktonic and attached microalgae in a shallow coastal lagoon (1999)
    Springer
    Hydrobiologia 408-409 (1999), S. 285-291 
    Details
    ISSN: 1573-5117
    Keywords: phytoplankton ; epiphyton ; microphytobenthos ; biomass ; resuspension
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Three microalgal communities were studied between August 1996 and September 1997 in a brackish lagoon, Laguna de Rocha (Uruguay), located on the south-eastern coast of South America. The system is shallow and periodically connected to the Atlantic Ocean and the anthropogenic influence is scarce. The freshwater and marine water inflows cause an extreme horizontal gradient in water level (range = 0.25–1.2 m), conductivity (range = 0.2–48.9 mS cm-1), nutrient concentration and sediment characteristics (sandy to muddy). At the northern station, dominated by freshwater, and at the southern one, dominated by the marine influence, the chlorophyll aamount of phytoplankton, microphytobenthos and epiphyton was measured on a monthly basis. Relating to lake surface, chlorophyll aranged from 0.7 to 9.0 mg m-2for phytoplankton, and from 2.7 to 162 mg m-2for microphytobenthos. The epiphyton reached chlorophyll amounts from 2.7 to 536 mg m-2relating to the surface of the colonized macrophytes. The contribution of the epiphyton to the total algal biomass of the system was negligible however, since the development of the macrophyte substrate was scarce during the whole study period. Phytoplankton biomass was similar at both stations whereas microphytobenthos biomass was significantly higher (p〈0.05) at the freshwater station, probably due to better nutrient availability. Considering the relative microalgal biomass estimated through the chlorophyll acontent of the three communities, the system was dominated by the epipelon in the freshwater area and by epipsammon in the marine one. The benthic dominance classifies the system in a `dry state' (sensuGoldsborough & Robinson, 1996), favoured by the extreme shallowness, the high nutrient content and light availability at the bottom.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1017086513787
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  • 6
    Electronic Resource
    Electronic Resource
    Solid substrate growth of white rot fungi on coffee pulp (1988)
    Berlin : Wiley-Blackwell
    Acta Biotechnologica 8 (1988), S. 211-223 
    Details
    ISSN: 0138-4988
    Keywords: Life Sciences ; Life Sciences (general)
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Notes: The presence of several antiphysiological factors limit the use of coffee pulp in monogastric and ruminant feeding. Twenty six white rot fungi were grown under solid substrate conditions in previously ensiled and pressed coffee pulp without adding additional sources of nitrogen. All grew and wholly covered the surface of the substrate. Six of them produced fruiting bodies. The weight loss interval ranged between 6.7-28.0% dry matter before fructification and from 17.0 to 48.7% after fructification. Some fungi biodegraded about 70, 55 and 47% of the total polyphenols, caffeine and permanganate lignin present in the original substrate.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/abio.370080302
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