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  • 1
    ISSN: 1432-1912
    Keywords: Phentolamine ; Dihydroergocristine ; Isoxsuprine ; Rat's Blood Pressure and Heart Rate ; Noradrenaline-Induced Pressore Responses ; Central and Peripheral Sympathetic Stimulation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Phentolamine, dihydroergocristine and isoxsuprine were compared for their effects on the blood pressure in anaesthetized normotensive rats, in rats made hypotensive by ganglionic blockade or by pithing and in rats with noradrenaline-induced hypertension. Their ability to inhibit pressor responses elicited by electrical stimulation of the posterior hypothalamus and of the sympathetic outflow from the spinal cord was also investigated. All three drugs appeared very potent in inhibiting noradrenaline-induced hypertension and caused a dose-dependent fall in blood pressure in normotensive rats, which however was less pronounced with dihydroergocristine than with phentolamine and isoxsuprine. In hypotensive rats, dihydroergocristine caused a rise in blood pressure. At higher doses than those required to block noradrenaline-induced hypertension, the three drugs inhibited pressor responses elicited by electrical stimulation and were equally active on peripherally- and centrally-evoked responses. Simultaneous recording of heart rate and blood pressure, both in anaesthetized and in pithed rats, indicated a reflex origin for phentolamine-induced tachycardia and a direct cardiac stimulation for isoxsuprine. Reflex changes of heart rate were not observed with dihydroergocristine.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Der Chirurg 68 (1997), S. 279-282 
    ISSN: 1433-0385
    Keywords: Key words: Intermuscular lipoma ; Intramuscular lipoma ; Infiltrating lipoma ; Treatment ; Diagnosis. ; Schlüsselwörter: Intermusculäres Lipom ; intramusculäres Lipom ; infiltrierendes Lipom ; Diagnose ; Therapie.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung. Intramusculäre Lipome sind seltene benigne Tumore, die wegen ihres nicht abgrenzbaren Wachstums auch als infiltrierende Lipome bezeichnet werden und tief lokalisiert die Skelettmuskulatur befallen. Klinisch imponiert als einziges Symptom eine palpable Raumforderung. Mikroskopisch findet sich zwischen den Muskelfasern monovacuoläres Fettgewebe, welches die Myocyten verdrängt. Im Extremfall kann die präexistente Muskulatur völlig durch Fettgewebe ersetzt werden. Eine sorgfältige pathohistologische Untersuchung aus einer repräsentativen Biopsie ist notwendig, um die Verwechslung mit einem gut differenzierten Liposarkom zu vermeiden. Die verspätete Diagnosestellung, die Ausdehnung und die Lokalisation des Tumors lassen R0-Resektionen oft nicht zu und beeinflussen die Rezidivraten, die zwischen 3 und 62 % angegeben werden [4]. R0-Resektionen sind in Fällen, bei denen postoperativ bedenkliche Funktionsverluste zu erwarten sind, nicht anzustreben. Funktionsstörungen werden langsam eintreten und können weitgehend kompensiert werden, im Gegensatz zu einem sofortigen Funktionsverlust nach radikaler Chirurgie.
    Notes: Summary. Intramuscular lipomas are rare, benign unencapsulated tumors. They are also called infiltrating lipomas because of their infiltrative growth pattern which, deeply localized, seizes the skeleton muscle. The only obvious symptom is a palpable mass. Microscopically, monovacular fat tissue shows up between the muscle fiber. In extreme cases the preexisting muscle can be totally replaced by fat tissue. A precise pathohistological examination is needed to avoid the mistaken diagnosis of a well-differentiated liposarcoma. Late diagnosis, the extent and the localization of the tumor often do not allow for an R0 resection and influence the postoperative recurrence rates, which lie between 3 and 62 %. R0 resections are not desirable when postoperative severe loss of function can be expected. Malfunctions will slowly take place and can greatly be compensated, in contrast to a radical procedure with immediate loss of function.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 174 (1954), S. 401-402 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] EXCHANGE REACTIONS CATALYSED BY LIVER MITOCHONDRIA IN THE ABSENCE OF ADDED SUBSTRATE Oxygen uptake . 0.05 M Inorganic phosphate (phosphorus-32) - ATP exchange Total phosphorus-32 added 3,670 c.p.m. Total phosphorus-32 found in ATP 820 c.p.m. Amount of reaction, 32?PiATP 14 moles Inorganic ...
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1569-8041
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Background: Experimental studies have demonstrated that 5-fluorouracil(5-FU) enhances zidovudine (AZT)-induced DNA strand breaks and cytotoxicity.Phase I studies have demonstrated that the maximum tolerable dose (MTD) of AZTis 8000 mg/sqm when administered i.v. over two hours after weekly 5-FU +l-leucovorin (LV), and that this combination has promising antitumor activity.The purpose of this study was therefore to evaluate the antitumor activity ofweekly bolus 5-FU + LV + AZT, administered at its MTD, and to determinewhether 5-FU enhances AZT-induced DNA strand breaks in blood nuclear cells. Patients and methods: Twenty-nine chemotherapy-naïve metastaticcolorectalcancer patients with measurable disease entered the study to evaluate theactivity of a weekly 5-FU 500 mg/m2 i.v. bolus + LV 250mg/m2 i.v. two-hour infusion + AZT 8000mg/m2 i.v. two-hour infusion. In 10 different patients, whoduring three different weeks received 5-FU + LV, AZT and 5-FU + LV + AZT, DNAstrand breaks in blood nuclear cells were determined by a fluorescent analysisof DNA unwinding. Results: Treatment was generally well tolerated and WHO grades III–IVtoxicities, consisting mostly of diarrhea (17%), were uncommon. Onepatient died of severe diarrhea with consequent hypokalemia and cardiacarrhythmia. All patients were considered evaluable for response, and 3(10%) complete and 10 (35%) partial responses were observed, foran objective response rate of 45% (95% confidence limit interval26%–64%). Both 5-FU + LV and AZT decreased the percentageof double stranded DNA in nuclear blood cells. The greatest effect wasobserved with 5-FU + LV + AZT, which reduced the percentage of double strandedDNA to 50% and 36% after 24 and 48 hours, respectively, and thisinteraction between 5-FU + LV and AZT was found to be cumulative. Conclusions: These studies demonstrate that the present dose and scheduleof AZT in combination with 5-FU + LV has significant activity in metastaticcolorectal cancer and that the combination of 5-FU + LV with AZT increases theamount of DNA damage. Therefore, AZT in combination with 5-FU + LV warrantsfurther study in colorectal cancer.
    Type of Medium: Electronic Resource
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