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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
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
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  • 3
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 261 (1976), S. 717-719 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Binding of 3H-haloperidol was done on calf caudate homogenates, while binding of 3H-dopamine was done using rat caudate, by modifications of methods described before5?7. The fresh caudate tissues were homogenised in 10 volumes of ice-cold THAN buffer (15 mM Tris-HCl, pH 7.4, 5 mM Na EDTA, 1.1 mM ...
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  • 4
    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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  • 5
    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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  • 6
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The high-resolution (300 MHz) proton nmr spectrum of E. coli tRNAfMet has been examined in 0.17M NaCl, with and without Mg2+, and at various temperatures. In light of recent studies of other E. coli tRNA and fragments of tRNAfMet, some low field (11-15 ppm) resonances previously assigned to secondary structure base pairs are reassigned to a tertiary structure A14-S4U8 base pair and a protected uridine residue in the anticodon loop. These two resonances and other low field resonances which are assigned to secondary structure base pairs are used to monitor the thermal unfolding of the molecule. In the absence of Mg2+ the tertiary structure base pair is present only to ∼45°C, but in the presence of Mg2+ it remains until at least 70°C. Analysis of the temperature dependence of other low field resonances indicates that the melting of the dihydrouridine stem occurs more or less simultaneously with the loss of tertiary structure. The observation of the resonance from the A14-S4U8 base pair proves that tertiary structure is present in this molecule below 40°C, even in the absence of Mg2+.
    Additional Material: 5 Ill.
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  • 7
    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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  • 8
    ISSN: 1432-0800
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Type of Medium: Electronic Resource
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  • 9
    ISSN: 1432-0800
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Type of Medium: Electronic Resource
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  • 10
    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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