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  • Chemistry  (15)
  • Biochemistry and Biotechnology  (3)
  • Entrapment neuropathy  (2)
  • 1
    Digitale Medien
    Digitale Medien
    Posterior interosseous nerve syndrome: literature review and report of 14 cases (1998)
    Springer
    European journal of plastic surgery 21 (1998), S. 196-202 
    Details
    ISSN: 1435-0130
    Schlagwort(e): Key words Posterior interosseous nerve syndrome ; Entrapment neuropathy ; Lateral elbow pain
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract  The posterior interosseous nerve (PIN) paralysis is characterized by weakness of the innervated muscles: the supinator muscle, the extensor muscles to the wrist, fingers and thumb (except the extensor carpi radialis longus) and the abductor pollicis longus muscle. Exploration of the nerve is recommended if there are no signs of spontaneous recovery after a period of observation of three to nine months. Another form of posterior interosseous nerve syndrome (PINS), also called the radial tunnel syndrome, presents with proximal forearm pain only. It is recommended to treat these patients conservatively at first. Only if conservative therapy does not relieve the symptoms of pain the PIN should be explored. A retrospective follow-up study of 14 patients with PINS was carried out, of which 12 patients had paresis or paralysis and two patients a pain syndrome. All, but one, were operated on. The results at follow-up will be discussed. It is recommended that the period of observation should be six to eight months for patients with PIN paresis, however, for patients with a full paralysis it is not possible to make any recommendation from this series. In contrast to the results reported in the literature, both our patients with pain as the only symptom obtained poor results at follow-up. For this group of patients the importance of the conservative treatment is emphasized.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s002380050068
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  • 2
    Digitale Medien
    Digitale Medien
    Anterior interosseous nerve syndrome: literature review and report of 11 cases (1998)
    Springer
    European journal of plastic surgery 21 (1998), S. 189-195 
    Details
    ISSN: 1435-0130
    Schlagwort(e): Key words Anterior interosseous nerve syndrome ; Entrapment neuropathy ; Neuralgic amyotrophy
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract  The anterior interosseous nerve syndrome (AINS) is characterized by weakness of the flexor pollicis longus and the flexor digitorum profundus of the index finger. The orthopedic literature suggests that this syndrome is caused by mechanical compression of the nerve (an entrapment neuropathy) and that decompression should take place after an observational period of 6 to 12 weeks. The neurological literature suggests that AINS is a form of neuralgic amyotrophy and that it is safe to treat patients with AINS nonoperatively to obtain good results. With this controversy in mind, a retrospective follow-up study of 11 patients with this syndrome was conducted. Eight patients were operated on and three patients were treated conservatively. The question whether a patient should be operated on or not, cannot easily be answered. It is recommended that spontaneous recovery should be awaited in patients having other neurological symptoms in combination with AINS. In patients with symptoms caused by AINS only, the observation period should be 8 to 12 months.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s002380050067
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  • 3
    Digitale Medien
    Digitale Medien
    Pilot scale affinity chromatography: Purification of β-galactosidase (1974)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 16 (1974), S. 1103-1112 
    Details
    ISSN: 0006-3592
    Schlagwort(e): Chemistry ; Biochemistry and Biotechnology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Biologie , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Notizen: β-Galactosidase has been purified from an ammonium sulfate precipitate of E. coli strain ML308 by biospecific adsorption on a column of agarose gel substituted with p-aminophenyl-β-D-thiogalactopyranoside. The system described using a 1.8 liter column has a useful processing capacity of 3.8 × 106 units of β-galactosidase per 2 hr cycle. This corresponds to about 5 g of pure enzyme. An electromechanical timing device operates a set of six solenoid valves and carries out a preset program consisting of sample application, washing, and elation operations.
    Zusätzliches Material: 4 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/bit.260160810
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  • 4
    Digitale Medien
    Digitale Medien
    The properties of magnetic supports in relation to immobilized enzyme reactors (1973)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 15 (1973), S. 603-606 
    Details
    ISSN: 0006-3592
    Schlagwort(e): Chemistry ; Biochemistry and Biotechnology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Biologie , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Zusätzliches Material: 1 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/bit.260150318
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  • 5
    Digitale Medien
    Digitale Medien
    Stability of alginate-immobilized algal cells (1986)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 28 (1986), S. 210-216 
    Details
    ISSN: 0006-3592
    Schlagwort(e): Chemistry ; Biochemistry and Biotechnology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Biologie , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Notizen: Investigations were carried out using immobilized Chlorella cells to determine the diameter, compressibility, tolerance to phosphate chelation, and ability to retain algal cells during incubation of various alginate beads. These physical bead characteristics were found to be affected by a variety of interactive factors, including multivalent cation type (hardening agent) and cell, cation, and alginate concentration, the latter exhibiting a predominant influence. The susceptibility of alginate beads to phosphate chelation was found to involve a complex interaction of cation type, concentration, and pH of phosphate solution. A scale of response ranging from gel swelling to gel shrinking was observed for a range of conditions. However, stable calcium alginate beads were maintained in incubation media with a pH of 5.5 and a phosphate concentration of 5μM. A preliminary investigation into cell leakage from the beads illustrated the importance of maintaining a stable gel structure and limiting cell growth to reduce leakage.
    Zusätzliches Material: 6 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/bit.260280210
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  • 6
    Digitale Medien
    Digitale Medien
    Measurement of equilin and estrone in human plasma by capillary gas chromatography-negative ion chemical ionization mass spectrometry (1987)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 10 (1987), S. 6-11 
    Details
    ISSN: 0935-6304
    Schlagwort(e): Capillary gas chromatography ; Negative ion mass spectrometry ; Plasma ; Estrone ; equilin ; Conjugated estrogens ; Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: A procedure is described for the analysis of the estrogens equilin and estrone in human plasma following oral administration of conjugated estrogen preparations. After enzymatic hydrolysis of the sulfate conjugates, plasma proteins are precipitated with methanol and the estrogens extracted into ethyl acetate. Derivatization with the reagent flophemesylamine converts equilin and estrone into volatile pentafluorophenyldimethylsilyl ethers ideally suited to capillary gas chromatography-negative ion chemical ionization mass spectrometry. Using a 15 meter dimethyl silicone bonded phase fused silica capillary column separation of the estrone and equilin derivatives is achieved within 9 minutes. Selected ion monitoring of the intense negative molecular ions enables levels of 1 ng.ml-1 to be measured with coefficients of variation of 9.3 % and 14.2 % for estrone and equilin respectively. Plasma levels of the compounds are reported in two male volunteers up to 24 hours after dosing with 5 milligrams of Premarin™. (™ Ayerst Laboratories Inc., New York, USA.).
    Zusätzliches Material: 7 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/jhrc.1240100102
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  • 7
    Digitale Medien
    Digitale Medien
    A method for the estimation of acetanilide, paracetamol and phenacetin in plasma and urine using mass fragmentographyAbbreviations: BSA = N, O-bis-(trimethylsilyl)acetamide: Regisil = bis-(trimethylsilyl)trifluoroacetamide; TRI-SIL Z = trimethylchlorosilane + BSA + trimethylsilylimidazole. (1976)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 3 (1976), S. 60-63 
    Details
    ISSN: 1052-9306
    Schlagwort(e): Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Phenacetin, paracetamol and acetanilide can be determined in a plasma or urine sample by the use of deuterium labelled analogues. These are produced by reaction of hexadeuterioacetic anhydride with the appropriate aromatic amine. The -NHCOCD3 group is stable to hydrogen exchange below pH 8. The internal standard is added to the plasma or urine after enzymatic hydrolysis of the paracetamol conjugates and an ethyl acetate extract at pH 5 is evaporated under nitrogen and the residue derivatized with N, O-bis-(trimethylsilyl)-acetamide. An aliquot of this solution is injected into a g.c.m.s. system, and one ion characteristic of the material under study and the ion from the deuterium analogue (3 mass units greater) are monitored using a voltage switching technique. In the case of phenacetin, for example, ions at 251 and 254 are monitored. Calibration curves relating different weight ratios of the hydrogen and deuterium compounds to their respective signals from the gas chromatograph mass spectrometer are used to calculate the amount of a compound in a particular sample. These methods have been developed to study the oxidation of acetanilide to paracetamol and the de-ethylation of phenacetin to paracetamol. Preliminary results from experiments with phenacetin will be discussed.
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/bms.1200030204
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  • 8
    Digitale Medien
    Digitale Medien
    The identification of 6-methoxy 8-aminoquionoline as a metabolite of primaquine in man (1975)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 2 (1975), S. 304-306 
    Details
    ISSN: 1052-9306
    Schlagwort(e): Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: The identification of 6-methoxy 8-aminoquinoline as a metabolite of Primaquine, an important antimalarial drug, is described. The metabolite is present in urine, plasma and erythrocytes following drug ingestion. It was identified by mass fragmentography of its 1H and 2H acetate and the acetate produced from authentic material. No evidence of further metabolites was obtained.
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/bms.1200020605
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  • 9
    Digitale Medien
    Digitale Medien
    Single and multiple ion recording techniques for the analysis of diphenylhydantoin and its major metabolite in plasmaAbbreviations: DPH = diphenylhydantoin; HPPH = 5-(p-hydroxyphenyl)-5-phenylhydantoin; TMAH = trimethylanilinium hydroxide; BSA = N, O-bis-(trimethylsilyl)acetamide. (1977)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 4 (1977), S. 36-41 
    Details
    ISSN: 1052-9306
    Schlagwort(e): Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: A method has been developed for single ion monitoring of diphenylhydantoin and its major metabolite 5-(p-hydroxyphenyl)-5-phenylhydantoin in plasma. A plasma extract is reacted with N, O-bis(trimethylsilyl)acetamide and single ion recording is carried out using a gas chromatograph mass spectrometer system. The mass value selected, m/e 254, is common to the TMS ethers of diphenylhydantoin and its principal metabolite 5-(p-hydroxyphenyl)-5-phenylhydantoin. The results indicate that one cause of an adverse reaction to diphenylhydantoin could be a reduced ability to hydroxylate the drug. Quantitative methods for the analysis of the drug and its major metabolite have also been developed. Diphenylhydantoin and 5-(p-hydroxyphenyl)-5-phenylhydantoin can be analysed in plasma after addition of deuterium labelled internal standards and conversion to volatile derivatives for mass fragmentographic analysis. Diphenylhydantoin and its internal standard are analysed as the N, N-dimethyl derivative, and the hydroxylated metabolite and its internal standard are converted to a pertrimetylsilyl compound by reaction with N, O-bis-(trimethylsilyl)acetamide.
    Zusätzliches Material: 6 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/bms.1200040104
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  • 10
    Digitale Medien
    Digitale Medien
    Long-term evaluation of degradation and foreign-body reaction of subcutaneously implanted poly(DL-lactide-ε-caprolactone) (1997)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Biomedical Materials Research 36 (1997), S. 337-346 
    Details
    ISSN: 0021-9304
    Schlagwort(e): poly(DL-lactide-ε-caprolactone) ; degradation ; foreign body reaction ; subcutaneous implant ; Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin , Technik allgemein
    Notizen: The aim of this study was to evaluate the degradation and foreign-body reaction of poly(DL-lactide-ε-caprolactone) (PLA85CL50) bars. This specific biomaterial is used for the construction of nerve guides, which can be used in the reconstruction of short nerve gaps. Subcutaneously implanted PLA85CL50 bars were harvested after implantation periods ranging from 3 to 12 months and evaluated for the rate of degradation and the degree of foreign-body reaction. It was observed that this copolymer degraded completely within 12 months and that no lactide or ε-caprolactone crystals were formed. Furthermore, we conclude that the foreign-body reaction of PLA85CL50 is very mild. These properties make the amorphous copolymer of DL-lactide and ε-caprolactone (50:50) suitable for the construction of nerve guides. © 1997 John Wiley & Sons, Inc. J Biomed Mater Res, 36, 337-346, 1997.
    Zusätzliches Material: 5 Ill.
    Materialart: Digitale Medien
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