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  • Analytical Chemistry and Spectroscopy  (3)
  • Computed tomography  (3)
  • Adducts
  • tetradecyltrimethylammoniumsalicylate
  • 1
    Electronic Resource
    Electronic Resource
    Biological monitoring of acrylonitrile exposure through a new analytical approach to hemoglobin and plasma protein adducts and urinary metabolites in rats and humans (1993)
    Springer
    International archives of occupational and environmental health 65 (1993), S. S103 
    Details
    ISSN: 1432-1246
    Keywords: Acrylonitrile ; Adducts ; Biological monitoring ; Gas chromatography ; Hemoglobin
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary A new, simple and fast procedure of measuring acrylonitrile (ACN) in ACN derived mercapturic acids such as S-(2-cyanoethyl)-L-cysteine(CyEC), and in hemoglobin (Hb) and plasma protein adducts and urinary metabolites in rats and humans exposed to ACN was developed. ACN in mercapturic acids or proteins was analyzed by capillary gas chromatography (GC) by liberating ACN at a high-temperature in the injector port of GC with or without oxidizing sulfur atoms of the ACN-bound cysteines into sulfoxide form by hydrogen peroxide in vitro. At 350 °C, more than 90% of ACN in authentic CyEC was recovered by this method. Increasing a single ip dose of ACN from 5 to 50 mg/kg produced proportional increases in ACN bound to Hb 24 hr after the treatment. The alkylation of plasma protein with ACN was about 1/10 as low as that of Hb. After repeated daily ip doses of 1–10 mg/kg, ACN in Hb decreased with a half-life of about 9 days. ACN was also detected in the blood of workers exposed to ACN for 1 to 10 years at a Siberian synthetic rubber factory.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00381317
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  • 2
    Electronic Resource
    Electronic Resource
    An unusual cervical chordoma: CT and MRI (1996)
    Springer
    Neuroradiology 38 (1996), S. 466-467 
    Details
    ISSN: 1432-1920
    Keywords: Key words Cervical chordoma ; Magnetic resonance imaging ; Computed tomography
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract We report CT and MRI findings of an unusual cervical chordoma. CT showed only minimal bony destruction with a lobulated prevertebral mass. Sagittal MRI, however, clearly demonstrated a lesion involving the body of C2 extending prevertebrally and into the spinal canal.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00607279
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    An unusual cervical chordoma: CT and MRI (1996)
    Springer
    Neuroradiology 38 (1996), S. 466-467 
    Details
    ISSN: 1432-1920
    Keywords: Cervical chordoma ; Magnetic resonance imaging ; Computed tomography
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract We report CT and MRI findings of an unusual cervical chordoma. CT showed only minimal bony destruction with a lobulated prevertebral mass. Sagittal MRI, however, clearly demonstrated a lesion involving the body of C2 extending prevertebrally and into the spinal canal.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00607279
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Recurrent low-grade glioma in children with special reference to computed tomography findings and pathological changes (1990)
    Springer
    Child's nervous system 6 (1990), S. 155-160 
    Details
    ISSN: 1433-0350
    Keywords: Recurrence ; Low-grade glioma ; Children ; Malignant transformation ; Computed tomography
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Recurrent low-grade gliomas in children were studied with special reference to correlation between the computed tomography (CT) scan and pathological findings at recurrence. During the past 16 years (1970–1986) 105 cases of primary pediatric brain tumors were treated in our hospital. Seventeen of these had low-grade glioma, seven of which (five astrocytomas, one ependymoma, and one subependymoma) had recurrence of tumor by the end of 1987. The enhanced CT findings were classified into three types — cystic, false cystic, and solid, according to Lapras' classification. The pathological findings of recurrent tumors were reviewed with particular attention to malignant transformation. The results showed that in two out of three cases where CT findings had changed from initial cystic to solid type at recurrence malignant transformation was revealed. Enhanced CT scan was also useful for detecting small asymptomatic recurrent tumors in children. On the other hand, surgical procedures and adjuvant therapies demonstrated no significant relationship with recurrence. It is suggested that the recurrence of low-grade glioma in children is not rare, and that changes in findings on contrast enhanced CT might reflect malignant transformation in a recurrent tumor, necessitating a careful follow-up.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00308493
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    The viscoelasticity of spinnable solutions of alkyltrimethylammonium salicylates (1992)
    Springer
    Colloid & polymer science 270 (1992), S. 249-258 
    Details
    ISSN: 1435-1536
    Keywords: Viscoelasticity ; spinnability ; tetradecyltrimethylammoniumsalicylate ; hexadecyltrimethylammoniumsalicylate ; rodlikemicelle
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The viscoelasticity has been measured for aqueous solutions of tetradecyl-and hexadecyltrimethylammonium salicylates (C14TASal, C16TASal). The aqueous solutions of C14TASal without salt displayed the gel-like behavior at 10.0×10−2 g cm−3, but those more dilute than 3.2×10−2 g cm−3 presented the viscoelasticity similar to that of a Maxwell liquid. The Maxwell-like behavior was converted to the polymer-like one on the addition of (0.1–0.2) M NaBr or (0.02–0.2) M NaSal. The gel-like viscoelasticity can be connected with the spinnability of “cohesive fracture failure”, and the Maxwell-like and polymer-like viscoelasticities are concerned with the spinnability of “ductile failure”. The gel-like and Maxwell-like viscoelasticities originate in the pseudo-network formed by the pseudo-linkages between rodlike micelles, while the polymer-like viscoelasticity is caused by the entanglement of long rodlike micelles in semidilute and concentrated solutions. The aqueous solutions of C16TASal behaved very similar to those of C14TASal.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00655477
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  • 6
    Electronic Resource
    Electronic Resource
    The spinnability of viscoelastic solutions of tetradecyl- and hexadecyl-trimethylammonium salicylates (1990)
    Springer
    Colloid & polymer science 268 (1990), S. 460-468 
    Details
    ISSN: 1435-1536
    Keywords: Spinnability ; viscoelasticsurfactantsolution ; tetradecyltrimethylammoniumsalicylate ; hexadecyltrimethylammonium salicylate ; rodlikemicelle
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The spinnability was measured for aqueous viscoelastic solutions of tetradecyl- and hexadecyltrimethylammonium salicylates (C14TASal, C16TASal) in the absence and presence of sodium salicylate (NaSal) and sodium bromide (NaBr). The spinnability is classified into two types, D and C. While the intrinsic drawing length in type D is proportional to the drawing velocity, the drawing intrinsic length in type C decreases with the drawing velocity or is independent of it. The spinnability changes from type D to C, as the drawing velocity and the surfactant concentration increase, and the temperature lowers. The effect of salt is different between NaSal and NaBr. It can be assumed that a pseudo-network structure composed of rod-like micelles is formed in viscoelastic and spinnable surfactant solutions. Then, the spinnability depends on the balance between the elasticity and the viscosity in which the structure results.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01411005
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  • 7
    Electronic Resource
    Electronic Resource
    A novel method of preparing of glass capillary columns: Low-temperature plasma etching and polymerization (1979)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 2 (1979), S. 400-404 
    Details
    ISSN: 0935-6304
    Keywords: Gas chromatography ; Capillary, glass ; Low temperature plasma etching ; Polymer film on the inner surface from organosilicone monomer ; Flexibility of this new method discussed ; Discharge chamber described ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A novel method is described for the preparation of stable glass capillary columns (glass open tubular columns), including the etching and formation of a polymer film on the inner glass capillary surfaces. The approach used here is based on low-temperature plasma etching and polymerization. Under the influence of a field of radio frequency discharge, low pressure gases of fluoric compounds, introduced into the glass capillary tube, generate excited fluorine radicals which etch the inner surface. The plasma of organosilicone monomer in the glass capillary yields a uniform polymerized film on the inner surface. The resultant material functions as a good stationary phase for glass capillary gas chromatography (GC2). The inner surfaces treated with such a plasma, can be studied by means of a scanning electron microscope (SEM). The flexibility of this method permits the use of various stationary phases and surface modification.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240020706
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  • 8
    Electronic Resource
    Electronic Resource
    Rapid characterization of spices and herbs by direct heating sample introduction using a curie-point pyrolyzer (1988)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 11 (1988), S. 347-350 
    Details
    ISSN: 0935-6304
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240110412
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    Paper (German National Licenses)
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  • 9
    Electronic Resource
    Electronic Resource
    Analysis of crude drugs by pyrolysis gas chromatography (1985)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 8 (1985), S. 360-361 
    Details
    ISSN: 0935-6304
    Keywords: Pyrolysis gas chromatography ; Fused silica open tubular column ; Crude drugs ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240080708
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