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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Archives of microbiology 132 (1982), S. 270-275 
    ISSN: 1432-072X
    Keywords: Escherichia coli ; Succinate semialdehyde dehydrogenase ; Aromatic catabolism ; Hydroxyphenylacetate ; Genetic mapping
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Escherichia coli mutants, unable to grown on 4-hydroxyphenylacetate, have been isolated and found to be defective in the NAD-dependent succinate semialdehyde dehydrogenase. When the mutants are grown with 4-aminobutyrate as sole nitrogen source an NAD-dependent succinate semialdehyde dehydrogenase seen in the parental strain is absent but, as in the parental strain, an NADP-dependent enzyme is induced. Growth of the mutants is inhibited by 4-hydroxyphenylacetate due to the accumulation of succinate semialdehyde. The mutants are more sensitive to inhibition by exogenous succinate semialdehyde than is the parental strain. Secondary mutants able to grow in the presence of 4-hydroxyphenylacetate but still unable to use it as sole carbon source were defective in early steps of 4-hydroxyphenylacetate catabolism and so did not form succinate semialdehyde from 4-hydroxyphenylacetate. The gene encoding the NAD-dependent succinate semialdehyde dehydrogenase of Escherichia coli K-12 was located at min 34.1 on the genetic map.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Virus genes 17 (1998), S. 5-9 
    ISSN: 1572-994X
    Keywords: fowlpox virus ; sequence ; homology
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Nucleotide sequence analysis of the 4.3 kbp BamHI-N fragment of the fowlpox virus (FPV) genome revealed that it encodes 7 proteins with homology to vaccinia virus (VV) E11L, E10R, O1L, O3L, I1L, I2L and I3L encoded proteins. No evidence of FPV homolog of VV O2L could be found.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1534-4681
    Keywords: Pediatric oncology ; Gastrointestinal tumors ; Abdominal lymphoma ; Inflammatory pseudotumor
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Background: Gastrointestinal tumors are relatively uncommon in infants and children, and the histologic diagnoses differ from those seen in an adult practice. Furthermore, the clinical presentation of such tumors is quite variable. Methods: We reviewed the records of 39 pediatric patients who had been treated for tumors of the alimentary tract at our hospital over the past 20 years. The symptoms, physical findings, treatments, and outcomes are tabulated and discussed. Results: Non-Hodgkin's lymphoma was the predominant diagnosis. It was found in 22 children, and the survival rate was 60%. Other malignant tumors found in this pediatric series included colorectal carcinoma in four patients and gastric leiomyosarcoma in one. The outcomes of these patients were poor; four of the children have died, and one girl remains alive with extensive disease. Benign lesions included neurogenic tumors (n=5), inflammatory pseudotumors (n=3), hemangiomas (n=2), teratoma and carcinoid (n=1 each). These tumors were ultimately cured, with one exception, after surgical resection. Conclusions: Gastrointestinal tumors in children cover a broad spectrum of benign and malignant varieties and stem from conditions that differ significantly from those observed in adults. While treatment varies according to diagnosis, most patients respond best to complete resection of the primary tumor.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Annals of surgical oncology 1 (1994), S. 121-127 
    ISSN: 1534-4681
    Keywords: Pediatric oncology ; Mediastinal tumors
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Background: Mediastinal masses are relatively common in infants and children. These lesions are often neoplastic in origin and have a high risk of malignancy. Methods: This report concerns 196 infants and children with mediastinal tumors. Fifty-five cases (28%) were benign, and 141 (72%) were malignant. Diagnosis included Hodgkin's disease (47), neuroblastoma (46), non-Hodgkin's lymphoma (37), teratoma (18), ganglioneuroma (14), cystic hygroma (11), Schwannoma (five), germ-cell tumors (three), lipoma (three), thymic tumor (three), malignant histiocytosis (two), neurofibroma (two), mesenchymal sarcoma (one), rhabdomyosarcoma (one), peripheral neuroectodermal tumor (one), hamartoma (one), and hemangioma (one). Diagnoses were usually made by assessing the patient's age, radiologic evidence of tumor location, the presence of calcium in the tumor, and the presence of tumor markers (α-fetoprotein, vanillmandelic acid, human chorionic gonadotropin). Diagnoses were verified by histologic evaluation. Resection was the only treatment for benign tumors. Biopsy and chemotherapy (and/or radiation) were employed for lymphoid tumors, and resection and adjuvant therapy were used for other solid malignancies. Results: Survival was achieved in 53 of 55 (96.3%) patients with benign tumors and 105 of 141 (74.4%) patients with malignant tumors. Conclusions: Seventy-two percent of mediastinal tumors in this study were malignant. Early diagnosis followed by biopsy and chemotherapy for lymphoid tumors or resection of nonlymphoid tumors along with aggressive adjuvant therapy result in high survival rates (74.4%). Children with benign tumors almost always survive (96.3%) after resection.
    Type of Medium: Electronic Resource
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