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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Journal of molecular evolution 49 (1999), S. 551-557 
    ISSN: 1432-1432
    Keywords: Key words: Genome comparison — Functional classes —Haemophilus influenzae—Saccharomyces cerevisiae—Methanococcus jannaschii— Archaea
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract. The evolutionary divergence among the three major domains of life can now be addressed through the first set of complete genomes from representative species. These model species from the three domains of life, Haemophilus influenzae for Bacteria, Saccharomyces cerevisiae for Eukarya, and Methanococcus jannaschii for Archaea, provide the basis for a universal functional classification and analysis. We have chosen 13 functional classes and three superclasses (ENERGY, COMMUNICATION and INFORMATION) as global descriptors of protein function. Compositional comparison of the three complete genomes reveals that functional classes are ubiquitous yet diverse in the three domains of life. Proteins related with ENERGY processes are generally represented in all three domains, while those related with COMMUNICATION represent the most distinctive functional feature of each single domain. Finally, functions related with INFORMATION processing (translation, transcription, and replication) show a complex behaviour. In Archaea, proteins in this superclass are related with proteins in either Eukarya or Bacteria, as recognized previously. The distribution of functional classes in the three domains accurately reflects the principal characteristics of cellular life forms.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Biophysics and Biomolecular Structure 25 (1996), S. 113-136 
    ISSN: 1056-8700
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Biology , Physics
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1365-2133
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Summary The prevalence of the t(2:5)(p23;q35) and/or anaplastic lymphoma kinase (ALK) gene products in cutaneous anaplastic large cell (ALC) lymphomas and a potential precursor lesion, lymphomatoid papulosis (LyP). is controversial. ALK gene products, which are absent from normal lymphohae-matopoietic cells, are a phenotypic marker of lymphomas carrying the t(2:5). We used in situ hybridization and immunohistology to screen 14 cutaneous ALC lymphomas, 21 cases of LyP, and one nodal ALC lymphoma associated with LyP for ALK gene products. ALK gene products were not detectable in these cases. In contrast, ALK gene products were found in a lymphonodal ALC lymphoma with subsequent extension to the skin and in t(2:5)-positive cell lines. Detection of the Epstein-Barr virus (EBV)-encoded small nuclear transcripts (EBER), and of immunoglobulin light chain transcripts served to check for the presence of cellular RNA in the tissue sections. EBER transcripts were found in scattered reactive lymphoid cells, but not in atypical or tumour cells. ALK gene expression and EBV infection seem to be a rare finding in cutaneous ALC lymphomas and LyP. This points to a molecular aetiology of primary cutaneous ALC lymphomas and LyP distinct from that of extracutaneous CD30+ lymphoproliferative disease. Detection of the t(2;5) or ALK gene products in cutaneous lymphoproliferative lesions therefore requires exclusion of extracutaneous ALC lymphoma in such patients.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    British journal of dermatology 136 (1997), S. 0 
    ISSN: 1365-2133
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Substantial subcutaneous haemorrhage without preceding trauma or underlying bleeding disorder is a rare occurrence in dermatological practice, essentially restricted to early childhood (acute haemorrhagic oedema of childhood). We report an adolescent with a morphologically unique bleeding manifestation. A 16-year-old presented with two episodes of massive subcutaneous haemorrhage in association with urticarial vasculitis. There was no history of preceding trauma or haemorrhagic disorder. Haemorrhage was observed in areas typically affected by angioedema, such as the periorbital, perioral, lingual, sublingual and laryngeal areas. History revealed an atopic diathesis with hay fever and examination showed alopecia areata. An antinuclear antibody titre and the presence of lupus anticoagulant indicated transient antiphospholipid antibodies. As urticaria corresponds to urticaria profunda angioedema, we hypothesize a pathophysiological relationship between superficial urticarial vasculitis and the deep variant of urticarial vasculitic disease, leading to the unique morphology present in our patient.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 29 (1996), S. 714-716 
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: Nine of the 20 natural amino acids contain a planar group in their side chains. For these groups, normal deviations from planarity were derived by the study of similar fragments in accurately determined small molecule structures. Comparison of these deviations with values found from a representative set of high-quality protein structures revealed that the planarity of the aromatic residues and arginine in protein structures is comparable to similar fragments in small molecules. For Asn, Gin, Asp and Glu, however, the deviations are up to twice as large as in comparable small-molecule structures, suggesting that adding an extra planarity restraint for these residue types could improve refinement procedures.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 376 (1995), S. 647-648 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] SIR-On July 28, 1995, the timely public release of the complete DNA sequence of Haemophilus influenzae Rd made the world of biology richer, in one day, by 1,830,137 characters of genetic information encoding a complete bacterial construction kit of 1,743 predicted protein genes1. While marveling at ...
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 1432-1963
    Keywords: Schlüsselwörter In-situ-PCR ; PCR-in-situ-Hybridisierung ; Key words In situ PCR ; PCR in situ Hybridization
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary In situ polymerase chain reaction (PCR) and PCR in situ hybridization are new diagnostic tools in dermatopathology. These techniques can combine the sensitivity of PCR with the advantage of in situ hybridization to localize specific cellular structures. With optical control of the PCR reaction product in these techniques, false-positive results due to contamination can be minimized. Several working protocols have been established which allow detection of DNA and RNA sequences in a rapid and reproducible manner. Two different methods have been established to detect the amplification product, the indirect PCR in situ hybridization (PCRisHyb), and the direct in situ PCR (is PCR). An easy and reproducible method for PCRisHyb and isPCR in formalin-fixed and paraffin-embedded tissue is described and the two techniques are compared. Using both isPCR and PCRisHyb, the amplification product can be visualized with an optimal morphological preservation of the tissue. Indirect PCRisHyb showed a slightly higher specificity whereas direct isPCR was the quicker, easier and less expensive method.
    Notes: Zusammenfassung In-situ-PCR und PCR-in-situ-Hybridisierung sind neue molekularbiologische Methoden für Forschung und Diagnostik, die die Empfindlichkeit einer Polymerasekettenreaktion mit dem Vorteil der In-situ-Hybridisierung verbinden, gesuchte DNS-Abschnitte spezifisch einzelnen Zellen zuzuordnen. Zusätzlich kann durch optische Kontrolle des Reaktionsproduktes die Gefahr falsch-positiver Resultate durch Kontamination mit Fremd-DNS minimiert werden. In den letzten Jahren wurde eine Vielzahl von Anwendungsprotokollen beschrieben, die es erlauben, spezifische DNA- und RNA-Sequenzen mit Hilfe dieser Methode in einfacher Weise darzustellen. Grundsätzlich werden 2 verschiedene Methoden des DNS-Nachweises verwendet, die indirekte PCR-in-situ-Hybridisierung (PCRisHyb) und die direkte In-situ-PCR (isPCR). Anhand eines Fallbeispiels wird eine schnelle und reproduzierbare Methode für die PCRisHyb bzw. die isPCR an formalinfixiertem Paraffinmaterial vorgestellt und beide Techniken verglichen. Bei beiden durchgeführten Methoden (isPCR und PCRisHyb) zeigt sich eine gut sichtbare Darstellung des Amplifikationsproduktes bei optimal erhaltener Gewebsmorphologie. Der Vorteil der indirekten PCRisHyb liegt in der höheren Spezifität, während die direkte isPCR schneller, einfacher und kostengünstiger durchzuführen ist.
    Type of Medium: Electronic Resource
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  • 8
    ISSN: 1432-1963
    Keywords: Schlüsselwörter Kutane T-Zellymphome ; Klonalität ; Gamma-T-Zellrezeptor ; Polymerasekettenreaktion (PCR) ; Key words Cutaneous T-cell lymphoma ; Clonality ; Gamma-T-cell receptor ; Polymerase chain reaction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary Differentiation of a cutaneous lymphoma from a reactive lymphoid infiltrate is a demanding challenge for the pathologist. In this retrospective study we examined 24 paraffin-embedded tissue samples from lesions diagnosed as lymphomas and 7 control samples of skin affected by benign changes and with pronounced lymphoid infiltrates for clonal rearrangement of the gamma T-cellreceptor. Using PCR technology we demonstrated clonality in 22 cases of lymphoma (92 %). Thus, the primer combination used in this study covering the four main groups (I–IV) of the variable region of the gamma T-cell receptor gene allows high sensitivity. No clonality was demonstrable in any of the 7 control cases. This study demonstrates the growing importance of PCR technology for the diagnosis of lymphoma.
    Notes: Zusammenfassung Die Unterscheidung eines kutanen Lymphoms von einem reaktiven lymphoiden Infiltrat gehört zu den anspruchsvollsten Differentialdiagnosen in der Dermatohistopathologie. Im Rahmen einer retrospektiven Studie untersuchten wir 24 in Paraffin eingebettete Proben von Hautveränderungen, bei denen klinisch und histologisch ein T-Zellymphom diagnostiziert wurde, auf ein klonales Rearrangement des Gamma-T-Zellrezeptors mittels der Polymerasekettenreaktion (PCR). Als Kontrollen wurden 7 Biopsien entzündlicher Hautveränderungen mit einem ausgeprägten lymphoiden Infiltrat untersucht. Der Klonalitätsnachweis gelang in 22 von 24 Fällen der Lymphome (92 %). Bei den 7 Kontrollbiopsien konnte keine Klonalität nachgewiesen werden. Insofern ermöglicht die von uns gewählte Primerkombination, die jede der vier Hauptgruppen des Gam- ma-T-Zellrezeptorgens (V γ 1–8, V γ 9, V γ 10 und V γ 11) berücksichtigt, eine hohe Sensitivität. Die Untersuchung bestätigt die wachsende Bedeutung dieser Technik für die Diagnostik von Lymphomen.
    Type of Medium: Electronic Resource
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  • 9
    ISSN: 1432-069X
    Keywords: Key words Kaposi’s sarcoma ; Herpesvirus-like DNA ; HIV ; PCR analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
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  • 10
    ISSN: 1615-5742
    Keywords: Key words: Candida, funisitis, umbilical cord, placenta, fetus, infection
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: ABSTRACT We report on 32 cases of Candida funisitis and describe the associated clinicopathologic features. The Candida funisitis was characterized grossly by small, circumscribed, yellow-white nodules on the umbilical cord surface and, microscopically, by subamnionic microabscesses in which fungal organisms were demonstrable. Chorioamnionitis was present in all cases. Twenty-four (75%) of the 32 infants were premature. There were 7 perinatal deaths, all in immature fetuses. Five (16%) of the 32 fetuses had congenital candidiasis. Five (16%) of the mothers had a history of intrauterine foreign body, including intrauterine contraceptive device in three and cervical cerclage in two. The diagnosis of Candida funisitis should prompt a careful examination for fetal infection, even though it is associated with congenital candidiasis in only a minority of the cases.
    Type of Medium: Electronic Resource
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