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  • 1
    ISSN: 1471-4159
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Abstract: To elucidate the cellular location of mitochondrial malic enzyme in brain, immunocytochemical studies were performed. For this purpose, mitochondrial malic enzyme was purified to apparent homogeneity from bovine brain and used for the immunization of rabbits. Subjecting the antiserum to affinity purification on immobilized antigen as an absorbent yielded a purified immunoreactive antibody preparation, which was characterized by probing cytosolic and mitochondrial fractions of bovine and rat brain in western blotting. As neither crossreactivity with cytosolic malic enzyme nor immunoreactivity against other proteins could be observed, the antibody preparation was found suitable for immunocytochemistry. By using sections of perfusion-fixed rat brain, considerable resolution was achieved at the light-microscopic level. Distinct and specific staining of neurons was observed; in contrast, no staining of astrocytes and possibly unspecific staining within the nuclei of oligodendrocytes were obtained. From these data, it is concluded that mitochondrial malic enzyme is located in neurons; however, in astrocytes, the enzyme appears to be either lacking or present at a much lower level. A protective role against oxidative stress in neurons is proposed for mitochondrial malic enzyme.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-1920
    Keywords: Key words Magnetic resonance angiography ; Arteries ; supra-aortic ; Artery carotid ; Pulse sequences
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Our purpose was to evaluate a dedicated head and neck coil for demonstration of supra-aortic arteries with optimised magnetic resonance angiography techniques. We performed 47 examinations with a 1.5-T system. We used coronal 3D fast imaging with steady precession (FISP), axial 3D tilted optimised nonsaturating excitation (TONE) and 2D fast low-angle shot (FLASH) for the carotid bifurcation, axial 3D TONE with or without magnetisation transfer (MT) for intracranial arteries, and axial 3D FISP or TONE for the aortic arch. Evaluation included visual assessment of image quality and grading of stenoses near the carotid bifurcation; digital subtraction angiography was used as the reference method. Axial 3D TONE gave superior image quality at the carotid bifurcation, MT-TONE intracranially, and 3D FISP for the aortic arch vessels. Nevertheless, sensitivity and specificity for detection of significant stenoses were similar with coronal 3D FISP (96.3 %, 94.0 %), axial 3D TONE (92.6 %, 92.5 %) and axial 2D FLASH (96.3 %, 86.6 %). Image quality at the aortic arch needs further improvement.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1432-1289
    Keywords: Schlüsselwörter Fokale Leberläsion ; Computertomographie ; Kernspintomographie ; Angiographie
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Zum Thema Diese Arbeit gibt eine Übersicht über die wesentlichen radiologischen Methoden zum Nachweis von Raumforderungen in der Leber. Die Vor- und Nachteile der jeweiligen Techniken werden erörtert und Qualitätsmerkmale zur Beurteilung insbesondere computertomographischer Bilder gegeben. Die radiologische Diagnostik ergänzt im Regelfall den Ultraschall mit seinen modifizierten Anwendungen. Kommt sie zum Einsatz, dominiert die Computertomographie, meist kombiniert mit angiographischen Techniken. Die Wertlosigkeit der radiologischen Diagnostik bei malignen oder benignen Raumforderungen in der Leber wird anhand der entsprechenden Krankheitsbilder eingehend erläutert, auch im Vergleich und in Ergänzung zu anderen nicht radiologischen Untersuchungsmethoden.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1432-1289
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1569-8041
    Keywords: anal cancer ; cisplatin ; 5-fluorouracil ; phase II study ; radiation therapy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Background: Chemotherapy (5-fluorouracil–mitomycin C) concomitant withradiotherapy (RT) increases local control and colostomy-free survival inadvanced anal canalcarcinomas (ACC). The purpose of this prospective trial was to analyse thetoxicity of and response to an induction chemotherapy combining 5-fluorouracil(5-FU) and CDDP administered concomitantly with irradiation. Patients and methods: Thirty patients (24 F/6 M, mean age 60, range38–74) with an advanced ACC 〉40 mm and/or with node involvement wereprospectively treated (1 T1, 16 T2, 8 T3, 5 T4, 10 N1, 1 N2, 8 N3) fromNovember 1994 to January 1996. Two induction and two concomitant cycles of5-FU(800 mg/m2 D1–4 infusion) and CDDP (80mg/i.v./m2 at D1) were delivered. RT consisted of 45 Gy (1.8Gy/fr, 5 fr/w) on pelvis ± inguinal nodes or 30 Gy (3 Gy/fr, 4 fr/w)by direct perineal field. A boost (15–20 Gy) was delivered six weekslater. Results: Toxicity: one patient died of a pulmonary embolism on D4.The remaining 29 received the entire treatment, with reduced 5-FU doses in 11patients because of acute toxicity. The RT boost was delayed for one patient(aplasia). In 109 cycles, 3 grade 4 and 17 grade 3 toxicities were observed;there were no toxic deaths. Tumor response: the complete response (CR)and partial response (PR) rates were, respectively, 11% and 61%after induction chemotherapy, 59% and 31% after concomitantradiochemotherapy and 96% and 0% two months after completion ofthe treatment. No tumor progression was observed. Conclusion: the treatment was well tolerated and there was good compliance.After induction chemotherapy, most of the patients were in PR, with some evenin CR. After completion of the treatment all but one were in CR. The tumorresponse and the long term results of 50 patients will be analysed beforeinitiation of a randomised trial is considered.
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  • 6
    ISSN: 1432-0878
    Keywords: Salivary glands ; Lacrimal gland ; Male accessory sex glands ; Immunohistochemistry ; Androgen-dependent protein secretion ; Rat (Wistar)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Antibodies against 10 different secretory proteins from the accessory sex glands of the male rat were used for immunohistochemical studies of salivary and lacrimal glands from intact and castrated rats, at the light- and electron-microscopic levels. In the parotid gland, secretory acinar cells showed immunoreactivity with antibodies against prostatic binding protein, cystatin-related peptide and acid phosphatase (isoenzyme pI 8.0; 5.6) typical of ventral prostate, and seminal vesicle secretion VI. Western blotting analysis indicated that immunoreactivity against prostatic binding protein was attributable to a subunit, presumably C3. Acid phosphatase pI 5.6 showed a molecular weight of 66 kDa, which is at variance with the prostatic form. Immunoreactivity for secretory transglutaminase, derived from the coagulating gland, was restricted to myoepithelial and stromal cells. In castrated animals, the immunoreactivity of acinar cells was reduced to the background level, whereas stromal transglutaminase immunoreactivity was unaltered. The distribution pattern of immunoreactivity for the proteins mentioned was almost identical in the lacrimal gland. Significant differences were however observed in the immunoreactivity of the inframandibular gland, where serous glandular cells were non-immunoreactive for seminal proteins, with the exception of acid phosphatase isoenzyme pI 8.0. Granules present in the convoluted granular ducts were immunoreactive particularly for acid phosphatase (isoenzyme pI 5.6)but much less for cystatin-related peptide; immunoreactivity was reduced after castration. The straight portion of the inframandibular duct system was immunoreactive for transglutaminase, but no influence of castration was visible. The distribution of immunoreactivity for seminal proteins present in the salivary and lacrimal glands and the pronounced androgen-dependence of their expression point to functional relationships of the respective proteins at both glandular sites.
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 1432-0878
    Keywords: Key words: Salivary glands ; Lacrimal gland ; Male accessory sex glands ; Immunohistochemistry ; Androgen-dependent protein secretion ; Rat (Wistar)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract. Antibodies against 10 different secretory proteins from the accessory sex glands of the male rat were used for immunohistochemical studies of salivary and lacrimal glands from intact and castrated rats, at the light- and electron-microscopic levels. In the parotid gland, secretory acinar cells showed immunoreactivity with antibodies against prostatic binding protein, cystatin-related peptide and acid phosphatase (isoenzyme pI 8.0; 5.6) typical of ventral prostate, and seminal vesicle secretion VI. Western blotting analysis indicated that immunoreactivity against prostatic binding protein was attributable to a subunit, presumably C3. Acid phosphatase pI 5.6 showed a molecular weight of 66 kDa, which is at variance with the prostatic form. Immunoreactivity for secretory transglutaminase, derived from the coagulating gland, was restricted to myoepithelial and stromal cells. In castrated animals, the immunoreactivity of acinar cells was reduced to the backgroun d level, whereas stromal transglutaminase immunoreactivity was unaltered. The distribution pattern of immunoreactivity for the proteins mentioned was almost identical in the lacrimal gland. Significant differences were however observed in the immunoreactivity of the inframandibular gland, where serous glandular cells were non-immunoreactive for seminal proteins, with the exception of acid phosphatase isoenzyme pI 8.0. Granules present in the convoluted granular ducts were immunoreactive particularly for acid phosphatase (isoenzyme pI 5.6) but much less for cystatin-related peptide; immunoreactivity was reduced after castration. The straight portion of the inframandibular duct system was immunoreactive for transglutaminase, but no influence of castration was visible. The distribution of immunoreactivity for seminal proteins present in the salivary and lacrimal glands and the pronounced androgen-dependence of their expression point to functional relationships of the respective proteins at both gla ndular sites.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Cell & tissue research 288 (1997), S. 539-544 
    ISSN: 1432-0878
    Keywords: Key words: Testis ; hsp60 ; Infertility ; Spermatogonia ; Immunohistochemistry ; Human
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract. The immunohistochemical localization of heat-shock protein 60 (hsp60) was investigated in testicular biopsies obtained from 121 adult men with disturbed fertility. In normal unaffected tubules, hsp60 immunoreactivity was localized to spermatogonia, primary spermatocytes and Sertoli cells. In spermatogonia, cytosolic and mitochondrial labelling could be differentiated. In general, the number of stained spermatogonia decreased with the loss of spermatogenic function. A significant (P〈0.01) reduction of stained spermatogonia was observed in testes with maturation arrest of spermatogenesis at the level of primary spermatocytes (30.2±21.6%) compared with testes exhibiting normal spermatogenesis. In addition, the decrease in the score correlated significantly with the diminution of cytosolic hsp60 immmunolabelling (coefficient r=0.25, P=0.03). There was a significant difference (P〈0.01) in the percentage of cytosolic-stained spermatogonia in testes with a score equal to or greater than 5 (14.7±9.8%) and a score less than 5 (8.9±6.9%). These observations suggest that a low level of hsp60 expression in spermatogonia may lead to a different pattern of protection, which in turn could be involved in low spermatogenic efficiency.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Journal of materials science 15 (1996), S. 391-393 
    ISSN: 1573-4811
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    International journal of thermophysics 17 (1996), S. 179-190 
    ISSN: 1572-9567
    Keywords: density ; high pressures ; high teperaturm syringe pumps ; vibrating U-tube
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A vibrating U-tube apparatus has been developed for determining the densities of pure fluids and fluid mixtures at 10-200 MPa and 323-773 K. Measured parameters areP,T, andr (period of vibration). Fluids are injected into the U-tube at constantP andT. Three or more reference fluids are used to calibrate the response of the instrument. Fluid mixtures are produced by pumping pure fluids into T-junctions on the upstream side of the U-tube using high accuracy syringe pumps. An automated syringe pump is used to maintainP at setpoint ±0.01 MPa.T is controlled to ±0.01 K using a closed-loop, electronic signal amplification/feedback system. For mixtures, a statistically significant number of measurements of r are obtained to account for the effects of small heterogeneities in fluid composition (generally 〈0.005X;). Typically, density data for 15 fluids can be obtained in a 6- to 8-h period. Considering all of the potential sources of error in the experimentation, conservative estimates of uncertainty are as follows:P, ±0.02 MPa;T, ±0.05 K;p (pure fluids), ±0.0005g.cm−3; andp (fluid mixtures), ±0.0005-0.0010g-cm−3.
    Type of Medium: Electronic Resource
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