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  • 1
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Electron microscopic study was made on the water reabsorption of the epithelial cells of the rat cauda epididymidis. It was shown that when the epididymal duct was reabsorbing water at a maximal rate, widely dilated intercellular spaces were seen. It is suggested that the standing gradient model of water reabsorption first proposed for the gall bladder may also operate in the cauda epididymidis.
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Metrika 26 (1979), S. 1-4 
    ISSN: 1435-926X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Summary A procedure based on the extremal quotient is proposed for testing the null hypothesis H 0: the population of the sample has an exponential distribution against H a : it does not have an exponential distribution. The proposed procedure is a nonparametric test which could lead to an early decision for the rejection ofH 0
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  • 3
    ISSN: 1573-5117
    Keywords: Organic pollution ; clams ; seawaters
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A preliminary survey on the contamination of clams and sea-waters in various towns in Tolo Harbour was carried out using bacteriological tests. The ‘percentage clean’ method and the ‘most probably number’ method were employed. The pH, salinity and temperature of the seawater were also tested in the field. It was discovered that the number of coliform bacteria obtained by the ‘percentage clean’ was zero in both seawater and clams from all sites including the control. The ‘most probable number’ indicated that the water and the clam tissue collected in the three sites in Tolo Harbour ranged from 15–1,100/100 ml in the water and 825–11,000/g in the clams compared with 0/100 ml and 115/g of the control site. Due to the high level of organic pollution in Tolo Harbour, improvement of the sanitary situation is urged. Cultivation of clams collected in this area in clean and sterilized water for a few days before consumption is recommended.
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  • 4
    ISSN: 1432-0770
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Computer Science , Physics
    Notes: Abstract Two types of sensillum have previously been described in the trochanteral hair plate of the cockroach with differences in physical size, extracellularly recorded impulse amplitude and response to displacement. We have now examined the dynamic behaviour of the two types of sesillum in response to sinusoidal and random displacements. Type I sensilla have a frequency threshold of about 6 Hz, below which there is no response to sinusoidal displacement. Above the frequency threshold they behave as velocity sensors with a 90° phase lead of response over displacement and increasing response with increasing frequency. Type II sensilla have no detectable frequency threshold and behave as position sensors at low frequencies. With increasing frequency they display a phase lead over the stimulus but it nerver exceeds about 60°. Random stimulation followed by spectral analysis of the input-output relations give similar descriptions to the sinusoidal results except that low frequency position sensitivity is revealed in the Type I sensilla. The coherence function for both types of sensillum is low, indicating that the linear frequency response functions are poor approximations to the total behaviour of the sensilla. Earlier investigations of these receptors in a range of insects suggested that they are primarily involved in the control of joint positions during very slow movements. However, the present results, together with other recent work, indicates that they are also important in the control of rapid movements.
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  • 5
    ISSN: 1432-0800
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
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  • 6
    ISSN: 1432-0800
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
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  • 7
    ISSN: 1432-2323
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Résumé Au cours des 13 dernières années, 86 malades atteints de cancer de l'oesophage médiastinal supérieur ont été admis au Queen Mary Hospital, Hong Kong. Une résection a pu être réalisée dans 17 cas seulement. La technique d'exérèse est inspirée des descriptions de Waddell et Scanneil et de Cauchoix et Binet (1957). Dans chaque cas, l'oesophage a été réséqué en totalité et remplacé par l'estomac, dont le fundus est anastomosé au crico-pharyngien. Dans 1 cas cependant, l'oesophagoplastie a été faite par transplant jéjunal, et dans 1 autre cas en utilisant le colon. Il y a eu 3 décès postopératoires: 1 fistule gastro-trachéale par érosion par le tube de trachéotomie, 1 hémorragie, et 1 bronchopneumonie. Quatre patients sont actuellement en vie sans signe de récidive cancéreuse. La plus longue survie est de 5 ans 3 mois. Dix malades ont survécu 2–15 mois, avec une moyenne de 8.7 mois. Ces résultats sont au moins aussi favorables que ceux de Procter qui a une survie moyenne de 6.9 mois pour les cancers du 1/3 supérieur de l'oesophage traités par radio-thérapie. La mortalité est certes encore élevée, mais les résultats encourageants justifient l'utilisation du traitement chirurgical.
    Notes: Abstract During the past 13 years, 86 patients with carcinoma of the esophagus situated at the superior mediastinal segment were admitted and treated at the Queen Mary Hospital, Hong Kong. Only 17 of these patients underwent resection. The resection technique was based on what was described in 1957 by Waddell and Scannell and by Cauchoix and Binet. The whole of the esophagus was removed in each case and the reconstruction, using the stomach, was accomplished by anastomosing the fundus to the cricopharyngeus. In 1 patient an isolated jejunal segment was used in the esophagoplasty, while in another the colon was utilized. There were 3 postoperative deaths, 1 due to a gastrotracheal fistula from erosion by the tracheostomy tube, a second due to hemorrhage, and a third due to bronchopneumonia. Four patients are currently alive and well without evidence of cancer. The longest survivor has lived for 5 years and 3 months. Ten of the patients who were discharged from the hospital lived for from 2 to 15 months, with an average of 8.7 months. This compares favorably with the 6.9 months average survival reported by Procter in patients with carcinoma of the upper third of the esophagus who were treated by radiotherapy. While the mortality rate is still high, the results are encouraging and continued use of surgical treatment is certainly warranted.
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  • 8
    ISSN: 1432-2323
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Résumé Une pharyngo-laryngo-oseophagectomie a été réalisée chez un malade présentant, après irradiation, une récidive de cancer du larynx. Comme le malade avait subi antérieurement une gastrectomie de type Polya et que le colon n'était pas préparé, le jéjunum a été utilisé pour remplacer la perte de substance. Il s'agit du premier cas d'utilisation du jéjunum pour anastomose au pharynx dans une série de plus de 100 opérations de ce type. Le résultat obtenu est satisfaisant.
    Notes: Abstract A patient with recurrent carcinoma of the larynx following irradiation therapy was subjected to pharyngo-laryngoesophagectomy. Since he had had a previous Polya gastrectomy and the large bowel was not prepared, jejunum was used for esophageal replacement. This is the first patient in whom jejunum was used for anastomosis to the pharynx in our series of over 100 such operations. A satisfactory result was obtained.
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  • 9
    ISSN: 1432-8798
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Transmission of a Canadian arctic isolate of Northway virus has been demonstrated after incubation of arcticAedes communis mosquitoes at 13° C for 27 days after intrathoracic injection of 300 plaque forming units of virus. Replication has also been demonstrated after intrathoracic injection of domesticA. aegypti mosquitoes of this virus. Virions of Northway virus, 84–92 nm diameter were morphologically typical of a bunyavirus after propagation in salivary glands ofA. communis or in tissue cultures of baby hamster kidney (BHK-21) cells. An Ontario isolate of St. Louis encephalitis was transmitted by bites ofA. communis after 27 days incubation at 13° C after oral ingestion of 3 or 30 mouse LD50 virus. This mosquito species transmitted virus after 13 to 76 days incubation at 13° C following intrathoracic injection of 3 mouse LD50 or higher virus doses.
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  • 10
    ISSN: 1432-8798
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary After intrathoracic inoculation of laboratory-bredAedes aegypti mosquitoes with 3 Yukon isolates of California encephalitis (CE) virus (snowshoe hare subtype), Northway (NOR) and Murray Valley encephalitis (MVE) viruses, viral replication was observed following incubation at 13, 21, 35 and 39° C, which constituted the full temperature range of viability ofA. aegypti. Rates of viral replication were reduced at low temperatures and accelerated at high temperatures. Virus-specific immunoperoxidase staining of mosquito salivary glands occurred regularly after thoraces attained maximum infectivity levels. At 13 and 21° C, mosquitoes were infected by 10 to 100 times less CE and MVE viruses than mice, but about 10 times more NOR virus was required to infect mosquitoes than mice.
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