Library

feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 11
    ISSN: 0167-0115
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Medicine
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 12
    ISSN: 0167-0115
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Medicine
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 13
    ISSN: 0167-0115
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Medicine
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 14
    ISSN: 1432-1440
    Keywords: Cholecystokinin ; Gastrointestinal hormones ; Human ; Interdigestive pattern ; Fed pattern ; Pancreatic secretion ; Neurotensin
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The aim of the present study was to assess the role of cholecystokinin and neurotensin in converting the cyclical interdigestive pattern of pancreatic secretion into the non-cyclical fed pattern. Six healthy male volunteers were studied on 4 separate days. During each experiment a mixed liquid meal or solutions of individual nutrients were perfused intraduodenally for 180 min at 2 ml/min. The mixed meal contained 4.3 g glucose, 2.0 g fractionated soya oil, and 1.7 g casein hydrolysate per 100 ml, which delivered a caloric load of 0.9 kcal/min into the duodenum. The isocaloric and isotonic solutions of individual nutrients contained 44.5 g glucose, 17.8 g fractionated soya oil, or 44.5 g hydrolysed serum bovine albumin per liter and delivered 0.36 kcal/min into the duodenum. Duodenal aspirates and blood samples were collected at regular intervals for determination of pancreatic enzyme outputs and plasma levels of cholecystokinin and neurotensin, respectively. The mixed meal converted the cyclical interdigestive secretory pattern into the noncyclical fed pattern whereas none of the three individual nutrients abolished the interdigestive pattern. Not only the mixed meal but also lipid and protein perfusion consistently stimulated cholecystokinin release. Integrated incremental cholecystokinin release amounted to 32.3±9.9 pg/ml × 180 min with the mixed meal, 23.2±6.5 with lipid perfusion (P〈 0.05 versus mixed meal) and 13.4±3.8 with protein perfusion (P〈0.05 versus mixed meal). The carbohydrate solution did not significantly release cholecystokinin. None of the duodenal perfusates raised neurotensin plasma levels. We conclude that (a) intraduodenal delivery of a mixed meal at 0.9 kcal/min converts the interdigestive pattern of pancreatic secretion, (b) cholecystokinin but not neurotensin is involved in converting this pattern in response to low-caloric meals, and (c) a threshold amount of CCK release must be exceeded to convert the secretory pattern.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 15
    ISSN: 1435-2451
    Keywords: Push-Pull tuing ; GI-hormones ; Pancreas of rats ; Push-Pull-Kanülierung ; GI-Hormone ; Rattenpankreas
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Bei 15 Wistar-Ratten wurde eine 2,5 cm lange permeable capillare im Pankreascorpus zur Gewinnung von GI-Hormonen placiert. Am wachen, nicht narkotisierten Tier wurden 10 μl/min Ringerlösung in '/z h Fraktionen 2,5 h lang an drei verschiedenen Tagen über die Push-Pull-Methode perfundiert. Im Perfusat bestimmten wir das Pankreatische Polypeptid radioimmunoogisch. Die Basalwerte betrugen 5,8 ±2,5 pg/ml (z±SD). Nach Stimulation mit Cerulein stiegen die Basalwerte im Mittel auf das Doppelte und nach Gabe von 5 ml Pepton um 0,5 pg/ml. Die Push-Pull-Kanülierung des Pankreas ist eine neue Methode zum quantitativen Nachweis von pankreatischem Polypeptid aus dem Pankreas.
    Notes: Summary In 15 Wistar-rats a 2.5 cm long capillary tube was positioned in the corpus of pancreas. To get GI-hormones, 10 pl/min in '/z h fractions over 2.5 h in 3 days Ringer solution was perfused by the Push-Pull tubing method. After perfusion the Pancreatic Polypeptide was examined in a radio-immunoassay. The basal data were 5.8±2.5 pg/ml (R±SD). After stimulation with Cerulein the basal data rise in the mean to the double of the basal data and after 5 ml Pepton 0.5 pg/ml. The Push-Pull tubing method of the pancreas is a new method to examine pancreatic polypeptide quantitatively in unnarcotized rats.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 16
    ISSN: 1435-2451
    Keywords: Intestine Intravital microscopy Wistar rat Intestinal steal phenomenon Neurotensin Cholecystokinin
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract. Background: We investigated the effect of neurotensin and cholecystokinin (CCK) on intestinal microcirculation after ischemia–reperfusion. Method: Ischemia was induced in Wistar rats by occlusion of the superior mesenteric artery for 40 min. Ten minutes before reperfusion, infusion of either neurotensin or CCK was started. Afterwards, the microhemodynamics of the jejunum were examined by means of intravital microscopy. Results: Ischemia–reperfusion decreased functional capillary density from 873.4±18.1 to 362.5±8.3 cm–1 and red blood cell velocity from 0.49±0.03 to 0.34±0.02 mm/s. Furthermore, leukocyte–endothelium interaction was increased. Neurotensin infusion significantly increased functional capillary density to 483.2±9.0 cm–1 and red blood cell velocity to 0.69±0.01 mm/s in the mucosal capillaries compared with ischemic controls. Despite the amelioration of villus perfusion, the number of non-perfused villi significantly increased (11.8±3.6%) compared with ischemic controls. CCK infusion also resulted in a significant increase of functional capillary density (535.2±7.4 cm–1) and red blood cell velocity (0.67±0.01 mm/s). In contrast to neurotensin, the number of non-perfused villi was not increased (5.8±2.2%). Conclusion: We conclude that neurotensin further aggravates perfusion inhomogeneity and stasis when administered during the ischemic period. In contrast, CCK has no negative influence on perfusion homogeneity after ischemia–reperfusion. It may be superior to neurotensin in the reconstitution of normal microvascular perfusion patterns after ischemia–reperfusion.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 17
    Electronic Resource
    Electronic Resource
    Springer
    Langenbeck's archives of surgery 377 (1992), S. 133-140 
    ISSN: 1435-2451
    Keywords: Pancreatic secretion ; Pancreatic denervation ; Neurotensin ; CCK
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung In der vorliegenden Studic wurde der Einfluß des extrinsischen Nervensystems des Pankreas auf die exokrine Pankreassekretion nach Stimulation mit Sekretin, Zärulein, Tryptophan and Fett sowie die Aminosäure-und Fett-stimulierte Freisetzung von Neurotensin und CCK beim Hund untersucht. Die Denervation der Bauchspeicheldrüse führte zu keiner Veränderung der exokrinen Antwort auf Sekretin and Zärulein, dagegen bewirkte die Ausschaltung der extrinsischen Nerven eine signifikante Verminderung der Proteinantwort auf Tryptophan and Fett. Die Freisetzung von CCK wurde nicht verändert. Die Fett-stimulierten Neurotensinplasmaspiegel waren nach Denervation signifikant erhöht.
    Notes: Summary In the present study we examined the influence of extrinsic pancreatic innervation on exocrine pancreatic response to secretin, caerulein, tryptophan and fat, and furthermore the amino acid- and fat-stimulated release of neurotensin and CCK in dogs. Denervation of the pancreas did not alter secretory response to secretin and caerulein, whereas transsection of the extrinsic nerves significantly diminished the protein response to tryptophan and fat. Release of CCK was not altered by pancreatic denervation. However, fat-evoked neurotensin plasma levels were significantly increased after denervation of the pancreas.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 18
    ISSN: 1435-2451
    Keywords: Small bowel resection ; Segmental intestinal transplantation ; Cyclosporine ; Nutritional parameters ; Survival
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Die vorliegende Studie hatte zum Ziel, die Adaptation verschiedener Dünndarmabschnitte nach Resektion und Transplantation an der Ratte zu untersuchen. Stoffwechselparameter (Serumalbumin, Serumtriglyceride, Maltoseabsorption, Stuhlfettausscheidung) und Fett-stimulierte Neurotensinfreisetzung wurden 3 Monate postoperativ in Lewis-Ratten bestimmt, bei denen eine 2/3-Resektion (n = 21), eine syngene (Lewis→Lewis, n = 21) oder eine allogene (Brown Norway→ Lewis, n = 24) Segmenttransplantation durchgeführt worden war. Letale postoperative Komplikationen traten bei 3 Tieren nach allogener Transplantation auf (Ileus in 2 Fdllen, Pneumonie in einem Fall). Betrachtet wurde jeweils der proximale, mittlere oder distale Abschnitt (27 cm, etwa ein Drittel des Rattendünndarms) und zu nicht operierten Tieren (Kontrollen, n = 7), sowie zu Isotransplantaten (n = 7) und zu Allotransplantaten (n = 7) des gesamten Dünndarms in Beziehung gesetzt. Nach Allotransplantation wurde Cyclosporin (15 mg/kg KG i.m. Tag 0–2, 15 mg/kg KG s.c. Tag 3–14, 10 mg/kg KG s.c. Tag 15–28) verabreicht. Die Dünndarmresek-tion führte unabhdngig vom verbliebenen Anteil zu einer signifikanten Verringerung der Alnumin- und Triglyzeridwerte (p 〈 0,01) im Vergleich zum nicht operierten Tier, während die Maltoseabsorption unbeeinflulßt blieb. Die Stuhlfettausscheidung war lediglich nach distaler 2/3-Resektion signifikant erhöht (p 〈 0,05). Verglichen mit der Resektion ergab die syngene Transplantation keine Veränderung im Hinblick auf die Stoffwechselparameter, führte jedoch zu einer signifikanten Erhöhung der Hormonausschüttung (p 〈 0,05). Nach Allotransplantation verstarben alle Empfänger proximaler Dünndarm anteile zwischen Tag 8 und 10 nach Transplantation, ohne daß sich Hinweise auf eine akute Abstoßung oder chirurgische Komplikationen ergaben. Allotransplantationen mittlerer oder distaler Dünndarmanteile verliefen erfolgreich und zeigten keinerlei Nachteile im Vergleich zu Allotransplantaten des gesamten Dünndarms Bowie zu Isotransplantaten. Unsere Ergebnisse deuten darauf hin, daß im Fall einer Segmenttransplantation die unterschiedliche Adaptation verschiedener Dünndarmab-schnitte unter dem Einfluß einer immunsuppressiven Therapie beachtet werden sollte.
    Notes: Abstract The aim of the following study was to gain some insight into the functional characteristics of different portions of the small intestine after either partial resection or syngeneic and allogeneic transplantation 3 months postoperatively. Nutritional parameters (serum albumin levels, serum triglyceride levels, maltose absorption, excretion of fecal fat) and fat-stimulated neurotensin release were determined in Lewis rats that underwent small-bowel resection (n = 21), syngeneic (Lewis→Lewis, n = 21), or allogeneic transplantation (Brown Norway→Lewis, n = 24). The length of the remnant, isograft, or allograft was 27 cm (i.e., one-third of the rat small intestine) and consisted of the proximal (n = 7), middle (n = 7), or distal (n = 7) portion. Three postoperative deaths were due to ileus or pneumonia. After allotransplantation cyclosporine (15 mg/kg body wt. s.c.) was administered for graft acceptance. The control group was not operated upon, but was composed of weight- and age-matched Lewis rats (n = 7). We found that resection of two-thirds of the small intestine led to significantly lower levels of albumin and triglycerides in all three portions investigated (P 〈 0.01), but did not affect maltose absorption. Excretion of fecal fat was elevated significantly only after distal resection (P 〈 0.05). When compared to resected animals, syngeneic transplantation did not affect the nutritional parameters, but caused a significantly higher hormone release (P 〈 0.05) in all three different intestinal grafts. Allogeneic transplantation was successful when the middle or distal portion was grafted. All recipients of proximal allografts showed a severe loss of body weight and died between day 8 and 10 after transplantation. Postmortem examination revealed no signs of acute rejection. We conclude that when transplantation of short intestinal segments is considered, it is of vital importance to take into account the functional differences and the influence of immunosuppressive drug therapy in the regulation of bowel function.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...