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  • 1
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of interventional cardiology 10 (1997), S. 0 
    ISSN: 1540-8183
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1365-3040
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: These experiments investigate events involved in triggering sugar accumulation in the cold in tubers of Solanum tuberosum L. cv. Desirée. Sugar content, 14C-glucose metabolism, metabolite levels and activities of sucrose phosphate synthase (SPS) and starch-degrading enzymes were followed after transfer to 4°C. (i) Net sucrose accumulation began between 2 and 4 d. By 10 d, reducing sugars were also increasing. From 20 d onwards, sugar accumulation slowed. Sucrose fell, but reducing sugars continued to increase. (ii) To measure unidirectional sucrose synthesis, U-[14C]glucose was injected into tubers after various times at 4°C. The tubers were then incubated for 6 h. After 1 d at 4°C, both the absolute and the relative (expressed as a percentage of the metabolized label) rates of sucrose synthesis decreased compared to those at 20°C. Between 2 and 4 d at 4°C, labelling of sucrose increased 3-fold, to over 60% of the metabolized label. This high rate was maintained for up to 50 d in cold storage. When tissue slices were incubated with 2.5 mol m−3 U-[14C]glucose, the rate of labelling of sucrose in slices from 6 d cold-stored material was higher than in slices from warm-stored material, irrespective of whether the incubation occurred at 4°C or at 20°C. (iii) Hexose-phosphates increased during the first day after transfer to 4°C. Their levels fell during the next 3 d, as sucrose synthesis increased. They then rose (until 20 d) and fell, in parallel with the rise and decline of sucrose levels. UDPglucose remained unaltered during the first 4 d, and then increased and decreased in parallel with sucrose. (iv) SPS activity assayed in optimal conditions and the total amount of SPS protein did not change. However, when assayed in the presence of phosphate and limiting substrate concentrations, activity rose 3–5-fold between 2 and 4 d. (v) Amylases and phosphorylases were investigated using zymograms to separate isoforms. Phosphorylases did not change. Between 2 and 4 d at 4°C, a new amylolytic activity appeared. (vi) Estimates of the specific activity of the phosphorylated intermediates and the absolute rate of sucrose synthesis (calculated from the 14C-labelling data and metabolite analysis) showed that changed kinetic properties of SPS and decreased levels of hexose-phosphate are accompanied by a 6–8-fold stimulation of sucrose synthesis. They also show that the final level of sugar is partly determined by a cycle of sugar synthesis and degradation. (vii) It is concluded that the onset of sugar accumulation in cold-stored tubers is initiated by a change in the kinetic properties of SPS and the appearance of a new amylolytic activity. It is discussed how other factors, including hexose-phosphate levels and subcellular compartmentalization, could also influence the final levels of sugars by altering the balance of sugar synthesis and remobilization.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1460-9568
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Voltage-operated Ca2+ channels are heteromultimeric proteins. Their structural diversity is caused by several genes encoding homologous subunits and by alternative splicing of single transcripts. Isoforms of α1 subunits, which contain the ion conducting pore, have been deduced from each of the six cDNA sequences cloned so far from different species. The isoforms predicted for the α1E subunit are structurally related to the primary sequence of the amino terminus, the centre of the subunit (II–III loop), and the carboxy terminus. Mouse and human α1E transcripts have been analysed by reverse transcription–polymerase chain reaction and by sequencing of amplified fragments. For the II–III loop three different α1E cDNA fragments are amplified from mouse and human brain, showing that isoforms originally predicted from sequence alignment of different species are expressed in a single one. Both predicted α1E cDNA fragments of the carboxy terminus are identified in vivo. Two different α1E constructs, referring to the major structural difference in the carboxy terminus, were stably transfected in HEK293 cells. The biophysical properties of these cells were compared in order to evaluate the importance in vitro of the carboxy terminal insertion found in vivo. The wild-type α1E subunit showed properties, typical for a high-voltage activated Ca2+ channel. The deletion of 43 amino acid residues at the carboxy terminus does not cause significant differences in the current density and the basic biophysical properties. However, a functional difference is suggested, as in embryonic stem cells, differentiated in vitro to neuronal cells, the pattern of transcripts indicative for different α1E isoforms changes during development. In human cerebellum the longer α1E isoform is expressed predominantly. Although, it has not been possible to assign functional differences to the two α1E constructs tested in vitro, the expression pattern of the structurally related isoforms may have functional importance in vivo.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Oxford, U.K. and Cambridge, USA : Blackwell Science Ltd
    Histopathology 29 (1996), S. 0 
    ISSN: 1365-2559
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: The biological behaviour of meningeal haemangiopericytomas was retrospectively studied using immunohistochemical staining with MIB1, a monoclonal antibody against the Ki-67 antigen, a nuclear protein related to cell proliferation. Paraffin-embedded material from 62 tumours from 40 patients were investigated. The proliferating compartment of the tumours was estimated by evaluating the MIB1 staining index, i.e. the percentage of MIB1 positive nuclei in at least 1000 counted tumour cells in representative areas. The staining index ranged from 1.24% to 39.01%. Statistical analysis revealed no significant correlation between the staining index and recurrence-free survival (χ2 = 0.3922, P = 0.5311). Long-term observation (〉100 months), however, revealed a tendency to longer survival in the group with a staining index less than 5%. According to our results, the MIB1 staining index does not contribute to the accuracy of predicting the clinical outcome of meningeal haemangiopericytomas.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    European archives of oto-rhino-laryngology and head & neck 210 (1975), S. 300-301 
    ISSN: 1434-4726
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary A case report of Tangier disease (Anlipoproteinemia). The symptom is the orange yellow discolouration of hyperplastic tonsills. Further typical but not always present findings are orange yellow changes of the oropharynx and nasopharynx and enlargement of lymph nodes. The clinical, histological and electron-microscop ical findings are described. Being acquainted withe the disease the ENT specialist can establish an early diagnosis.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    European archives of oto-rhino-laryngology and head & neck 217 (1977), S. 475-485 
    ISSN: 1434-4726
    Keywords: Tangier disease ; Disorder of fat metabolism ; Yellow-orange enlargement of tonsills and adenoids ; Cholesteryl-ester storage in histiocytes ; Morbus Tangier ; Fettstoffwechselstörung ; Orange-gelbliche Verfärbung der Tonsillen ; Cholesterinesterspeicherung in Histiocyten
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Es wird über die ersten in Deutschland entdeckten Patienten mit einer Hypo-α-Lipoproteinämie — Tangier disease — berichtet. Diese Fettstoffwechselstörung zeichnet sich durch eine Verminderung der HDL-Lipoproteine im Serum sowie durch Cholesterinspeicherung in Histiocyten aus. Hervorstechendes Merkmal ist eine orange-gelbliche Verfärbung des lymphatischen Rachenringes; die weiteren Symptome können vielgestaltig sein, der Verlauf der Erkrankung ist wenig typisch. Als Ausdruck der wahrscheinlich autosomal rezessiv vererbten Fettstoffwechselstörung werden hauptsächlich Cholesterinester im Reticuloendothelialen System (z. T. in kristalliner Form mit Doppelbrechung) gespeichert, in geringerem Maße auch in glatten Muskelzellen, Pericyten und Schwannschen Zellen. Der Morbus Tangier kann durch laborchemische und ultrastrukturelle Kriterien von anderen Fettstoffwechselstörungen abgegrenzt werden. Eine causale Therapie ist nicht bekannt, der HNO-Arzt kann die sicher häufiger vorkommende Krankheit frühzeitig erkennen.
    Notes: Summary The report deals with the first three cases of Tangier disease (Hypo-α-Lipoproteinaemia) observed in Germany. This rare metabolic disorder is distinguished by a diminution of HDL-Lipoproteins in serum and a lipid storage in histiocytes. The prominent symptom is the orange yellow discolouration of hyperplastic tonsills and adenoids; further symptoms of the disease generally are various, the development is little typical. The morphological substrat of the deranged fat metabolism is cholesteryl ester storage in the reticuloendothelial system, smooth muscle cells, pericytes and Schwann cells of peripheral nerves. M. Tangier can be differentiated from other lysosomal defects by ultrastructural and chemical parameters, it seems to have a autosomal recessiv inheritance. It is the ENT-specialist, who can establish an early diagnosis of this disease, provided he is aware of its clinical features.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    European archives of oto-rhino-laryngology and head & neck 216 (1977), S. 623-624 
    ISSN: 1434-4726
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary In order to induce a serous otitis media in cats, the pharyngeal opening of the Eustachian tube was cauterized and obstructed on one side only through transpalatal approach; the other side remaind intact and served as control. On tympanic membrane examination and puncture 11 months later, there was fluid in the middle ear in three ears, no fluid in two ears, a tympanic membrane perforation in one ear and a red tympanic membrane in one ear. The middle ear was then ventilated through a plastic tube in two ears with and without fluid respectively. In all other ears, no tube was inserted. After another 7 months, the animals were intravitally perfused, and the middle ear mucosa biopsyed. The histological results of the light and electron microscopy showed chronic changes of the middle ear mucosa following experimental tubal obstruction.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Der Onkologe 2 (1996), S. 383-392 
    ISSN: 1433-0415
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
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  • 10
    ISSN: 1433-0407
    Keywords: Schlüsselwörter Pinealismischtumoren ; Sezernierende Keimzelltumoren ; β-HCG ; AFP ; Chemotherapie ; Key words Pinealoma ; Secreting germ cell tumors ; Primary intracranial germ cell tumors ; Tumor markers β-HCG and AFP ; Polychemotherapy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary
    Notes: Zusammenfassung
    Type of Medium: Electronic Resource
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