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
Filter
  • Life Sciences (general)  (2)
  • (Rat intestine)  (1)
  • Apoptose  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Biochimica et Biophysica Acta (BBA)/Biomembranes 1190 (1994), S. 170-172 
    ISSN: 0005-2736
    Keywords: (Rat intestine) ; Aminopeptidase P ; Brush-border membrane ; GPI-anchored enzyme ; Glycosylphosphatidyl inositol ; Membrane enzyme
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Medicine , Physics
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 2
    ISSN: 1432-1963
    Keywords: Schlüsselwörter HHV-6-Hodgkin-Lymphom ; Kikuchi-Lymphadenitis ; Onkogene ; Antionkogene ; Apoptose ; Key words HHV-6-Hodgkin's disease ; Kikuchi lymphadenitis ; Oncogens ; Antioncogenes ; Apoptosis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary HHV-6 infected immature T (HSB 2) and Hodgkin (HDLM 2) cells and biopsy tissues from lymph nodes of patients with Hodgkin's disease (HD) and Kikuchi lymphadenitis (KL) were studied immunohistologically for virus antigen expression and for the oncogene/anti-oncogene products ras, bcl-2 and p 53. Cell proliferation and cell death were tentatively monitored in tissue culture by PCNA staining, by viability testing and in situ end labeling of fragmented DNA. PCNA was also used in biopsy samples. KL is characterized by high incidences of focal cell death (i. e. histiocytic necrotizing lymphadenitis), while HD is apparently more a proliferative disease. The techniques used revealed no significant differences in the cellular expression of viral DNA or antigens among cell lines, HD or KL. The HDLM 2 cell line with the superior survival after HHV-6 infection showed a significantly lower expression of p 53 and PCNA than HSB 2 cells. Biopsy samples from patients with KL did not express p 53, and ras and PCNA were observed in fewer cells than in HD. Bcl-2, however, was significantly more frequently seen than in HD. The interpretation of the data is difficult; they suggest that there are additional regulatory influences in control of cell proliferation and cell death, such as cytokines and growth factors, which are altered after viral infection. Also, virus-induced cell death probably includes other mechanisms besides apoptosis, such as cell damage caused by oxygen radicals.
    Notes: Zusammenfassung HHV-6-infizierte Zellkulturlinien (HSB 2 T-Zellen; HDLM 2-Hodgkin-Zellen) sowie Biopsieproben von HHV-6-positiven Hodgkin(HD)- und Kikuchi-Lymphomen (KL) wurden immunhistologisch auf eine Expression der Genprodukte ras, bcl-2 und p 53 untersucht und die Ergebnisse korreliert mit Markern der Zellproliferation und mit Zeichen apoptotischen Zelltods. Die Ergebnisse der Zellkulturuntersuchungen sind eingeschränkt beurteilbar, da etablierte Zellinien bereits transformiert sind. Dennoch zeigen die Zellen mit geringerer Apoptoserate (HDLM 2) eine 10 fach geringere p 53-Expression und eine um die Hälfte verminderte PCNA-Anfärbung der Zellen. In den Biopsien des stärker nekrotisierenden KL war lediglich 1/6 bis 1/20 der ras-Expression des HD nachweisbar, p 53 fehlte gänzlich, während bcl-2 deutlich gegenüber dem HD gesteigert war. PCNA-positive Zellen waren beim HD etwa 3 mal so häufig, wie beim KL. Es fanden sich keine signifikanten Unterschiede in der Virus-DNS oder Antigenexpression bei den verschiedenen untersuchten Zellen. Die Ergebnisse lassen vermuten, daß weitere exogene Faktoren wie Zytokine und Wachstumsfaktoren in den Regelmechanismus für virusinduzierte Zellproliferation und Apoptose eingreifen, und daß neben der Apoptose andere Formen der viralen Zellyse vorkommen.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 3
    ISSN: 0138-4988
    Keywords: Life Sciences ; Life Sciences (general)
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Notes: Prolidase, a specific exopeptidase, is isolated from Escherichia coli B. The enzyme being present in the raw extract is purified and enriched by fractionated ammonium sulfate precipitation, ion exchange chromatography on DEAE-Sephadex A 50 as well as by gel filtration on Sepharose 4 B. Total yield of prolidase amounts to 19% with a 67fold enrichmentSubstrate specifity of the enzyme mainly corresponds to that of the animal prolidase. It is able to hydrolize the imido linkage at the N-terminal end of prolin in the case of di- and tripeptides. The temperature optimum of prolidase from E. coli B is 37 °C, the pH-optimum from pH 7.6 to 9.0. Storage stability at pH 8.6 and a temperature of 4 °C is optimal. The enzyme is only active in presence of Mn2+-ions. This metal cannot be replaced by Mg2-- or Zn2+-ionsA high enzyme activity and storage stability in presence of Mn2+-ions can be reached by immobilization of the prolidase, by covalent binding on Sepharose 6 B, adsorption on DEAE-Sephadex as well as by combination with glutar dialdehyde on DEAE-Sephadex.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 4
    Electronic Resource
    Electronic Resource
    Berlin : Wiley-Blackwell
    Acta Biotechnologica 7 (1987), S. 227-235 
    ISSN: 0138-4988
    Keywords: Life Sciences ; Life Sciences (general)
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Notes: The digestion of several proteins, casein, α-lactalbumin, human serum albumin and a mixture of whey proteins by immobilized pronase, thermitase and leucine aminopeptidase was studied on various conditions in five types of enzyme reactors. Reactors and operating conditions were designed to maximize the extent of hydrolysis and to minimize the adverse effects of the macromolecular nature of the substrates. A simple analytical method was developed to follow routinely the extent of hydrolysis. Substrate proteins were subjected to various pretreatments intended to disturb their native structure. The maximum feasible extent of hydrolysis in the reactor effluent, which is an average quantity, clustered around the magic figure of 33% in all systems studied. Protein digestion in bubbled column reactors charged with the polyaminomethylstyrene-fixed thermostable proteinase “thermitase” and operated at 50 to 60°C turned out to be the most efficient setup to produce continuously amino acid/peptide mixtures.
    Additional Material: 5 Ill.
    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...