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  • 1
    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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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Pediatric and developmental pathology 2 (1999), S. 143-147 
    ISSN: 1615-5742
    Keywords: Key words: cocaine, placenta, pathology
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: ABSTRACT Adverse perinatal outcomes of gravidas using cocaine is well documented, but the effects on the placenta have been difficult to elucidate due to confounding factors such as concurrent use of other drugs. This study compares pathologic findings of 26 placentas from women who used only cocaine during pregnancy with findings from 26 controls. All women were from a similar socioeconomic class and were controlled for gestational age and tobacco use. None of the cocaine placentas were from women whose toxicology screens were positive for drugs other than cocaine. In the 26 cocaine placentas, there was 1 infarct, 3 chronic villitis, and 1 segmental fibrosis, with none present in the controls. In the control group, there was 1 decidual vasculopathy and 1 thrombus in a maternal vessel, but none were in the cocaine placentas. Each group had 1 thrombus in a fetal vessel. The study group showed 6 cases of chorioamnionitis and 1 funisitis; the control group had 10 and 4 cases, respectively. None of the above or seven other features showed a statistically significant difference between the cases and controls. Cocaine is a potent vasoconstrictive agent that blocks re-uptake of norepinephrine at the adrenergic nerve terminals. Our study suggests that cocaine does not cause an increased incidence of any of the 15 clearly recognizable placental features examined.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 0749-503X
    Keywords: Saccharomyces cerevisiae ; chromosome IX ; centromere ; nucleic acid binding proteins ; Life and Medical Sciences ; Genetics
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology
    Notes: We have determined the nucleotide sequence of a cosmid (pIX338) containing the centromere region of yeast (Saccharomyces cerevisiae) chromosome IX. The complete nucleotide sequence of 33·8 kb was obtained by using an efficient directed sequencing strategy in combination with automated DNA sequencing on the A.L.F. DNA sequencer. Sequence analysis revealed the presence of 17 open reading frames (ORFs), four of them previously known yeast genes (sly12, pan1, sts1 and prl1), a tRNA gene and the centromere motif. Exhaustive database searches detected sequence homologues of known function for as many as 14 of the 17 ORFs. These include a mammalian tyrosine kinase substrate; the Escherichia coli cell cycle protein MinD; the human inositol polyphosphate-5-phosphatase (gene OCRL) involved in Lowe's syndrome, a developmental disorder; and helicases, for which the new yeast member defines a distinct DEAD/H-box subfamily. A surprisingly large fraction of the ORFs (at least six out of 17) in the centromeric region are apparently involved in RNA or DNA binding.The nucleotide sequence reported here has been submitted to the EMBL data library under the accession number X79743.
    Additional Material: 13 Ill.
    Type of Medium: Electronic Resource
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