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  • MOVPE  (3)
  • (Rabbit intestine)  (2)
  • Key wordsCarcinoma of the cervix  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Biochimica et Biophysica Acta (BBA)/Lipids and Lipid Metabolism 663 (1981), S. 613-620 
    ISSN: 0005-2760
    Keywords: (Rabbit intestine) ; Cholesterol ; Compactin ; Hydroxymethylglutaryl-CoA reductase regulation ; Mevalonate ; Sterol synthesis
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Medicine , Physics
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Biochimica et Biophysica Acta (BBA)/General Subjects 678 (1981), S. 202-206 
    ISSN: 0304-4165
    Keywords: (Rabbit intestine) ; Alkaline phosphatase ; Hormonal regulation ; Hydroxymethylglutaryl-CoA reductase
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Medicine , Physics
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Der Gynäkologe 32 (1999), S. 247-260 
    ISSN: 1433-0393
    Keywords: SchlüsselwörterZervixkarzinom ; Epidemiologie ; Humane Papillomviren ; Karzinogenese ; Prävention ; Key wordsCarcinoma of the cervix ; Epidemiology ; Human papillomavirus ; Carcinogenesis ; Prevention
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary Molecular and epidemiological studies have confirmed that human pathogenic papillomaviruses (HPV)types 16 and 18 are causally involved in the developement of carcinoma of the cervix. This statement is also true, albeit with reservations as yet, of other so-called high-risk HPV types, such as HPV 31, 33, 35, 39, 45, 51, 52, 56 and 58. Around 500,000 women throughout the world become ill with carcinoma of the cervix every year, and 1–4% of all younger women have a precancer of the cervix uteri. This knowledge of the viral origin of anogenital neoplasms has not yet been exploited for primary and secondary prevention of these illnesses, however. This is mainly because infection with genital HPV types is very prevalent in young women but seldom leads to carcinoma. In this review, therefore, the most important epidemiological data available on cervical carcinoma and its preliminary stages are analysed with reference to an association with HPV. In addition, the molecular biological data on HPV as it relates to anogenital carcinogenesis are presented. In conclusion, the significance of HPV for the prevention of carcinoma of the cervix is discussed.
    Notes: Zusammenfassung Durch molekulare und epidemiologische Studien wurde bewiesen, daß die humanpathogenen Papillomviren (HPV) Typ 16 und 18 ursächlich an der Entstehung des Zervixkarzinoms beteiligt sind. Diese Aussage gilt auch in bisher noch eingeschränktem Maße für andere sog. High-risk-HPV-Typen wie HPV 31, 33, 35, 39, 45, 51, 52, 56 und 58. Etwa 1/2 Mio. Frauen erkranken jährlich weltweit am Zervixkarzinom und zwischen 1–4% aller jüngeren Frauen leiden an einer Präkanzerose der Cervix uteri. Das Wissen um die virale Genese anogenitaler Neoplasien wird jedoch bisher nicht für die primäre und sekundäre Prävention dieser Erkrankungen eingesetzt. Dies liegt vor allem daran, daß die Infektion mit genitalen HPV-Typen bei jungen Frauen hoch prävalent ist, jedoch nur selten zum Karzinom führt. In der folgenden Übersicht werden daher die wichtigsten vorliegenden epidemiologischen Daten zum Zervixkarzinom und seinen Vorstufen auf ihre Assoziation mit HPV analysiert. Im weiteren werden die molekularbiologischen Daten von HPV für die anogenitale Karzinogenese dargestellt. Abschließend wird auf die Bedeutung von HPV für die Prävention des Zervixkarzinoms eingegangen.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Der Gynäkologe 32 (1999), S. 273-279 
    ISSN: 1433-0393
    Keywords: SchlüsselwörterZervixkarzinom ; Laparaskopische Diagnostik ; Laparaskopische Therapie ; Staging ; Laparoskopische Operationsverfahren ; Key wordsCarcinoma of the cervix ; Laparoscopic diagnosis ; Laparoscopic therapy ; Staging ; Laparoscopic surgical procedure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary Laparoscopic procedures have attained increasing importance in the diagnosis and therapy of carcinoma of the cervix in recent years (Table 1) [34]. Laparoscopic pelvic and para-aortal lymphadenectomies are therefore performed to assess the operability of carcinoma of the cervix and for its staging. In the case of primarily operable tumours, paraortal and pelvic lymphadenectomy is carried out by a laparoscopic procedure, and when the lymph nodes are negative nodes and there is no intra-abdominal metastasis the lymphadenectomy is combined with laparoscopically assisted vaginal hysterectomy. If laparoscopy discloses positive lymph nodes, debulking can be carried out and the patient can be referred for radiotherapy. In addition, laparoscopic procedures, even in combination with radical cervicectomy for early invasive carcinoma of the cervix, can mean conservation of the patient's fertility. In the case of primarily inoperable tumours laparoscopy can be used to assess the lymph node status and the intra-abdominal tumour spread and to classify the patient's condition as potentially secondarily operable or inoperable. In addition, in the case of primarily undertreated patients whose carcinoma of the cervix has been diagnosed incidentally in preparations of tissue examined following hysterectomy, posttreatment in the form of laparoscopic lymphadenectomy and laparoscopically assisted colpectomy can be performed.
    Notes: Zusammenfassung Laparoskopische Verfahren haben in den letzten Jahren zunehmend Bedeutung in der Diagnostik und Therapie des Zervixkarzinoms erlangt (Tabelle 1) [34]. So wird die laparoskopische pelvine und paraaortale Lymphonodektomie zur Beurteilung der Operabilität und zum Staging des Zervixkarzinoms eingesetzt. Bei primär operablen Tumoren wird die paraaortale und pelvine Lymphonodektomie laparoskopisch ausgeführt und bei negativen Lymphknoten und Fehlen einer intraabdominalen Metastasierung mit der laparoskopisch assistierten radikalen vaginalen Hysterektomie kombiniert. Werden durch Laparoskopie positive Lymphknoten gefunden, so kann ein Debulking durchgeführt und die Patientin der Strahlentherapie zugeführt werden. Zudem dienen laparoskopische Verfahren auch in Kombination mit der radikalen Trachelektomie beim frühinvasiven Zervixkarzinom der Erhaltung der Fertilität. Bei primär nicht operablen Tumoren kann die Laparoskopie dazu benutzt werden, Lymphknotenstatus und intraabdominale Tumorausbreitung zu beurteilen und Patientinnen in potentiell sekundär operabel und nicht operabel einzuteilen. Im weiteren kann bei primär untertherapierten Patientinnen, bei denen ein Zervixkarzinom im Hysterektomiepräparat als Zufallsbefund diagnostiziert wurde, eine Nachbehandlung mittels laparoskopischer Lymphonodektomie und laparoskopisch assistierter Kolpektomie erfolgen.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Advanced Materials for Optics and Electronics 3 (1994), S. 191-198 
    ISSN: 1057-9257
    Keywords: ZnSe ; ZnSSe ; GaAs substrate ; MOVPE ; Photoluminescence ; Quantum well ; Interface properties ; Growth interruption ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: In this work we report on ZnSxSe1 - x/ZnSe quantum wells grown by atmospheric pressure MOVPE on GaAs substrates. Diethylznc (DEZn), diethylselenium (DESe), diethylsulphur (DES) and H2S were used as source materials. Binary quantum wells with ZnSe or ZnS as barrier were usually grown in sets of 10 pairs on a 0.5 μm ZnSe or ZnS buffer, respectively. QWs with different well thicknesses (1-4 nm) show a typical shift to higher energies with decreasing well thickness and also a large decrease in PL intensity with increasing well thickness. Owing to the onset of relaxation above 5 nm well thickness, no PL emission could be observed. QWs of the same thickness but grown at different temperatures (420-520°C) show a broadened line shape with decreasing growth temperature. Growth interruption (3-50 s) also causes a broadening of the PL emission with decreasing interruption time. This is caused by interface reconstruction at higher growth temperatures and longer growth interruption. A ZnS buffer of 0.5 μm improves the PL line shape compared with a ZnSe buffer.ZnSxSe1 - x/ZnSe single and multiple QWs (Lz = 1-4 nm) were grown to reduce the strain in the structures. A typical quantum confinement energy shift of 160 meV for the 1 nm well can be observed in ZnS0.68Se0.32/ZnSe QWs. In comparison with the binary QWs, the FWHM could be reduced by about a factor of two to 34 meV. This improvement was obtained by an optimisation of the switching process to prevent the desorption of sulphur from the ZnSSe during the growth interruption.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Advanced Materials for Optics and Electronics 3 (1994), S. 203-208 
    ISSN: 1057-9257
    Keywords: ZnSe ; Diallylselende ; Plasma ; MOVPE ; Nitrogen doping ; Raman spectroscopy ; Photoluminescence ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: In order to obtain high quality Znse epilayers on GaAs which can be intentionally P- and n-type doped growth at a reduced temperature is highly desirable. Therefore in this work the suitability of diallylselenide and the influrnce of plasma precracking have ben investigated. Photoluminesscence, Raman spectroscopy, scanning electron microscopy, X-ray, SIMS and Hall measurements were used to anaylse the samples. The selenium precursor was fully decomposed at temperatures above 360°C if it was precracked by a plasma. Bound excitions could be resolved with negligible donor-acceptor pair (DAP) and copper green emission in the PL spectra form films which were grown with a plasma at temperatures beyond 530°C. Clearly the hpe for reduction in the deposition temperature was not achieved. Raman spectra also revealed strong crystalline quality variations. For the doping experiments nitrogen was used as the carrier gasa instead of hydrogen. Plasma cracking of the selenium precursor was still necessary. Thye substitution of the H2 carrier gas by nitrogen reduced the growth rate by a factor of 2.6 but enhanced the crystalline properties of the samples as shown by the Raman measurements. Strong DAP emission at 2.7eV in the (PL) spectra was observed. SIMS measurements showed a nitrogend concertration of about 3 × 1017 cm-3. An additional nirtogen plasama (0-7W) had a begligible effect on the nitrogen concentration in the sample. The samples were semi-insulating, whichmight be a conswquence of the crystalline quality of ZnSe grown with DASe as selenium precursor.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Advanced Materials for Optics and Electronics 3 (1994), S. 261-267 
    ISSN: 1057-9257
    Keywords: ZnSe ; ZnSxSe1 - x ; MOVPE ; Photoluminescence ; Mapping ; Purified ; DESe source ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: In this paper we report new results concerning the cause of impurities responsible for the Ix, and I2-peaks in photoluminescence (PL) spectra of ZnSe grown by MOVPE. An improvement in ZnSe epilayer quality is obtained by using a metal organic selenium precursor with reduced chlorine concentration. The PL spectrum of such a layer shows typical excitonic transitions, but compared with samples grown with a more contaminated source, the intensity of the Ix, and the I2 peaks decreases relative to the free exciton transition. A Gaussian fitting of the donor-bound exciton peaks taking the background of other structures into account shows that the ratio between the Ix and I2 peaks does not differ significantly between two samples. Both the decrease in donor-bound exciton transitions and the unchangeability of the ratio Ix/I2lead to the conclusion that only chlorine impurities are responsible for Ixand Ix. In order to verify the homogeneity of impurity uptake across a 2 inch wafer, we performed PL mapping of ZnSxSe1 - x layers. Mapping of a 2 inch ZnSe wafer shows that the FWHM of Ix across a wafer does not vary significantly (1.55 ± 0.21 meV). On mapping a 2 inch ZnS0.3Se0.7 wafer fabricated with H2S as the sulphur source at TD = 480°C, we found a rotational symmetric dstribution of sulphur in the layer. The sulphur content x at the centre is nearly constant. The difference in x between the centre and the boundary of a bad surface region at the edge of the wafer is less than Δx = 0.045. The FWHM of the band edge luminescence follows the same tendency across the wafer. The dependence of homogeneity on the reactor design as well as the uptake of unintentional impurities from the precursor is discussed in detail.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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