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  • 1
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    German Medical Science GMS Publishing House; Düsseldorf
    In:  Deutscher Kongress für Orthopädie und Unfallchirurgie; 71. Jahrestagung der Deutschen Gesellschaft für Unfallchirurgie, 93. Tagung der Deutschen Gesellschaft für Orthopädie und Orthopädische Chirurgie, 48. Tagung des Berufsverbandes der Fachärzte für Orthopädie; 20071024-20071027; Berlin; DOCW11-793 /20071009/
    Publication Date: 2007-10-10
    Keywords: ddc: 610
    Language: German
    Type: conferenceObject
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  • 2
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    German Medical Science; Düsseldorf, Köln
    In:  Deutscher Kongress für Orthopädie und Unfallchirurgie; 70. Jahrestagung der Deutschen Gesellschaft für Unfallchirurgie, 92. Tagung der Deutschen Gesellschaft für Orthopädie und Orthopädische Chirurgie und 47. Tagung des Berufsverbandes der Fachärzte für Orthopädie; 20061002-20061006; Berlin; DOCW.4.2.4-194 /20060928/
    Publication Date: 2007-03-09
    Keywords: ddc: 610
    Language: German
    Type: conferenceObject
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  • 3
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    German Medical Science GMS Publishing House; Düsseldorf
    In:  Deutscher Kongress für Orthopädie und Unfallchirurgie; 75. Jahrestagung der Deutschen Gesellschaft für Unfallchirurgie, 97. Tagung der Deutschen Gesellschaft für Orthopädie und Orthopädische Chirurgie, 52. Tagung des Berufsverbandes der Fachärzte für Orthopädie; 20111025-20111028; Berlin; DOCWI52-358 /20111018/
    Publication Date: 2011-10-18
    Keywords: ddc: 610
    Language: German
    Type: conferenceObject
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  • 4
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    German Medical Science GMS Publishing House; Düsseldorf
    In:  Deutscher Kongress für Orthopädie und Unfallchirurgie; 73. Jahrestagung der Deutschen Gesellschaft für Unfallchirurgie, 95. Tagung der Deutschen Gesellschaft für Orthopädie und Orthopädische Chirurgie, 50. Tagung des Berufsverbandes der Fachärzte für Orthopädie; 20091021-20091024; Berlin; DOCWI20-197 /20091015/
    Publication Date: 2009-10-16
    Keywords: ddc: 610
    Language: German
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  • 5
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    German Medical Science GMS Publishing House; Düsseldorf
    In:  Deutscher Kongress für Orthopädie und Unfallchirurgie; 71. Jahrestagung der Deutschen Gesellschaft für Unfallchirurgie, 93. Tagung der Deutschen Gesellschaft für Orthopädie und Orthopädische Chirurgie, 48. Tagung des Berufsverbandes der Fachärzte für Orthopädie; 20071024-20071027; Berlin; DOCP20-802 /20071009/
    Publication Date: 2007-10-10
    Keywords: ddc: 610
    Language: German
    Type: conferenceObject
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  • 6
    ISSN: 1432-2307
    Keywords: Exocrine pancreas ; Intracellular transport ; Colchicine ; Vinblastine ; Hexylene glycol ; Cytochalasin B ; Paracrystals
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The possible role of microtubules and microfilaments in the secretory process of the rat exocrine pancreas was analysed in vitro using isolated pancreatic lobules. Colchicine and vinblastine as microtubule inhibitors, hexylene glycol as a microtubule stabilizer, and cytochalasin B as a disruptive agent for microfilaments were used in increasing concentrations to test their effects on protein synthesis, intracellular transport, zymogen discharge, and cellular respiration. Colchicine only at 10−2 M concentrations inhibits protein synthesis, while vinblastine inhibits at 10−6 and 10−5 M by 20% and at 10−4 M by 55%. A similar inhibition is observed with 1.5% concentrations of hexylene glycol while cytochalasine B at 1,5 and 10 μg/ml is without effect on protein synthesis. Colchicine and vinblastine have their major effects on intracellular transport both in secretion studies and cell fractionation experiments. Colchicine in concentrations between 10−3 to 10−5 M inhibits discharge of newly synthesized proteins by 50%, while vinblastine shows a dose-response relationship of 40% inhibition at 10−6 M to 90% at 10−4 M. Discharge of amylase is uniformly reduced by 30% by both colchicine and vinblastine in the whole dose range. The pronounced effect of colchicine and vinblastine is evident in cell fractionation studies: both drugs inhibit the disappearance of protein radioactivity from microsomes and its appearance in zymogen granules; similarly the peak radioactivity in smooth microsomes (Golgi) appears delayed. No differential effect on the secretory process was observed with 1.5% concentrations of hexylene glycol or cytochalasin B at 1.5 and 10 μg/ml concentrations. A fines tructural analysis of microtubules and microfilaments in the exocrine pancreatic cell reveals their distribution in all parts of the cytoplasm and in relation to all cell organelles. Both systems (microtubules, microfilaments) seem to be connected, at least in certain areas of the cytoplasm and at the plasma membrane. The reduction of transport efficiency by microtubule inhibitors results in a deposition of secretory material in the cisternal space of the rough endoplasmatic reticulum, which leads to the formation of paracrystals. Colchicine at 10−3 M concentrations leads to an enlargement of condensing vacuoles in the Golgi complex.
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  • 7
    ISSN: 1432-2307
    Keywords: Exocrine pancreas ; Secretory process ; Cobalt ; Lanthanum ; Intracellular transport ; Secretion granules
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The effects of cobalt and lanthanum on the secretory process of the rat exocrine pancreas was studied in vitro using isolated pancreatic lobules. Cobalt in concentrations between 10−3 to 10−5 M has no effect on the rate of protein synthesis, intracellular transport, or discharge of zymogen granules, if the total population of stored granules is considered. It has, however, a marked effect on the release of newly packed zymogen granules which are formed during incubation in 10−3 M CoCl2. Determination of specific radioactivity in amylase released under the stimulation of 5×10−6 M carbamylcholine and of total proteins retained in the zymogen granule fraction during stimulation indicate that granules formed during incubation in CoCl2 are excluded from discharge. Lanthanum, on the other hand, has a differential effect on protein synthesis, intracellular transport, and discharge. Incorporation of tritiated leucine into TCA-precipitable proteins is inhibited by 50% at 10−3 M LaCl3. Intracellular transport as studied by cell fractionation is not changed during the first 35 min post pulse but is delayed from then on. This late effect is more pronounced if pancreatic lobules are preincubated for 60 min in 10−3 M LaCl3. Discharge of amylase and newly synthesized proteins is inhibited dose-dependently up to 80% by 10−3 M LaCl3. The effects of both cobalt and lanthanum are not due to an inhibition of cellular respiration. Comparison of these results with the inhibitory action of antimycin A between 10−4 to 10−8 M concentrations reveals a dose-dependent diminution of the rate of protein synthesis and intracellular transport, while discharge of granules is less energy dependent. The fine structural appearance of pancreatic lobules after 3 hrs incubation in 10−3 M CoCl2 is not altered, while in 5×10−3 and 10−3 M lanthanum acinar lumina are enlarged and the apical cytoplasm contains large vacuoles. At the highest concentration of lanthanum a flocculent electron dense material is observed apposed to the external lamina of the plasma membrane. The distribution of this material on the membrane is described. Antimycin A leads to callular changes corresponding to the irreversible inhibition of cellular respiration. It is concluded from the results that cobalt acts on the process of granule formation inside the cell, while lanthanum by its binding to the plasma membrane may alter molecules involved in secretagogue binding and transport systems into the cell.
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  • 8
    ISSN: 1432-2307
    Keywords: Human acute pancreatitis ; Enzyme immunocytochemistry ; Ultrastructure ; Acinar cell degranulation ; Fat necrosis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Human acute pancreatitis results from an autodigestive process frequently associated with alcohol abuse, gall stone disease and shock. Peripancreatic fat necrosis was identified as one of the earliest visible lesions, whereas acinar cell necrosis and haemorrhage were regarded as secondary changes. To examine the alterations in acinar cells in more detail, their enzyme content and fine structural features were studied immunocytochemically using antisera against α-amylase, lipase, trypsin, chymotrypsin and pancreatic stone protein, and electronmicroscopically in pancreatic tissues from patients with severe acute pancreatitis. Peripheral acinar cells in the immediate vicinity of fat necrosis were found to be heavily degranulated, while acinar cells at some distance of necrosis fully retained their enzyme content. Other frequent changes of the acinar cells included cuboidal transformation, loss of microvilli, increased occurrence of autophagosomes, and formation of enlarged acinar lumina. As there was no apparent cell membrane leakage or rupture of duct lumina, it is concluded that the acinar cells adjacent to fat necrosis release their granules by undirected basolateral extrusion. The findings thus suggest that one of the basic defects in acute pancreatitis is the uncontrolled release of enzymes from peripheral acinar cells into the interstitial space which, in turn, presumably by the action of lipase, leads to autodigestive fat necrosis.
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  • 9
    ISSN: 1432-2307
    Keywords: Exocrine pancreas ; Pancreatitis ; Secretory process ; Interstitial oedema
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Conscious rats were infused via a jugular vein catheter with 5×10−6 g/kg/h caerulein for periods up to 24 h. On macroscopic inspection a progressive interstitial oedema is seen to develop in the pancreas, from one hour of infusion on and is most marked at twelve hours. This oedema is largely reabsorbed after 24 h treatment, but the pancreas is considerably indurated by this time. Serum amylase levels increase consistently to reach a tenfold elevation above controls after three, six or twelve hours infusion. Premature fusion of condensing vacuoles and secretory granules leads to formation of large vacuoles in the cytoplasm of exocrine pancreatic cells. These vacuoles fuse with the lateral and basal plasma membrane and realease their content into the extracellular space. Regular discharge of zymogen granules at the cell apex into the duct system does not occur. Vacuole formation is associated with cytoplasmic destruction of the pancreatic cells. The rate of protein synthesis decreases consistently as a result of these structural alterations and this change corresponds largely to a reduction of cellular respiration. Release of amylase from isolated pancreatic lobules of caerulein infused animals shows a progressive increase of unstimulated discharge, while in vitro stimulation with 5×10−6 M carbamylcholine gives secretion patterns of wash-out kinetics. Stimulated discharge of labeled secretory proteins indicates a progressive reduction in the in vitro sensitivity of the pancreatic cells to secretagogues. After 24 h infusion of 5×10−6 g/kg/h caerulein the pancreatic lobules are totally insensitive to the in vitro effect of carbamylcholine or caerulein.
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  • 10
    ISSN: 1432-2307
    Keywords: Pancreatitis ; Regeneration ; Secretory process ; Mitotic activity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Rat exocrine pancreatic function was studied structurally and biochemically after the in vivo production of acute interstitial pancreatitis by supramaximal stimulation with caerulein. Two major phases in the reaction of the gland were observed: During the first two days after cessation of the supramaximal stimulation a progressive infiltration of the interstitium and the pancreatic tissue with polymorphonuclear leucocytes, lymphocytes and macrophages occurred which led to further destruction of the gland and to decreased functional response. From two days after the cessation of the treatment, hypertrophy of centro-acinar cells and an increased rate of mitotic activity indicated regeneration of the pancreas. This was combined with an accelerated in vitro discharge of newly synthesized proteins over a period of four days. Between days three and six after the initial treatment mitotic activity was also observed in fully differentiated exocrine cells. Total structural and functional recovery of the pancreas was achieved nine to twelve days after the cessation of the supramaximal stimulation.
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