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  • 1990-1994  (33)
  • 1955-1959  (2)
  • 1905-1909  (1)
  • 1
    Digitale Medien
    Digitale Medien
    Characterization of Czochralski- and hydrothermal-grown Bi12SiO20 (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 660-666 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: An investigation was made of the defect characteristics of single-crystal Bi12SiO20 (BSO) grown by both Czochralski (Cz) and hydrothermal transport methods. Only Cz-grown BSO is photorefracting using a coherent pumping source centered around 500 nm, as undoped hydrothermal BSO is transparent throughout the visible spectrum. Thermally stimulated current (TSC) studies in conjunction with temperature-dependent optical-absorption measurements and room-temperature photoconductivity data all indicate that the hydrothermal material is near intrinsic in terms of its low defect content. TSC measurements made below room temperature indicate that concentrations of traps of activation energy 〈0.7 eV are a factor of 103 smaller in hydrothermal than in Cz BSO. At least six different defects were identified in the TSC measurements. Temperature-dependent optical-absorption measurements indicate two Urbach band tails for Cz-grown materials that are not observed in the hydrothermal materials. Cz material of lower purity also possesses an impurity band tail which can be observed through temperature dependent optical absorption measurements. Comparison of Cz material with hydrothermal BSO of similar impurity content suggests that the BiSi defect responsible for the 500 nm absorption may be complexed with an impurity such as Fe or V. In the absence of this defect, however, these impurities have no effect on the absorption. An additional defect in the TSC data is also related to a transition metal impurity. The results indicate that the photoconductivity associated with the photorefractive effect in Cz material must proceed via a trap-hopping conduction mechanism that is missing in the intrinsic material.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.357808
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  • 2
    Digitale Medien
    Digitale Medien
    Gamete intrafallopian transfer (GIFT) compared with intrauterine insemination in the treatment of unexplained infertility (1991)
    Oxford, UK : Blackwell Publishing Ltd
    BJOG 98 (1991), S. 0 
    Details
    ISSN: 1471-0528
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: Objective— To compare GIFT, intrauterine insemination (IUI) with, and without, ovarian hyperstimulation in the treatment of unexplained infertility.Design— Women randomly allocated to one of three treatment protocols.Setting— Northern Regional Fertility Centre.Subjects— 59 couples with unexplained infertility of more than 3 years duration.Interventions— Three cycles of either GIFT, IUI after ovarian hyperstimulation or IUI in a spontaneous cycle.Main outcome measures— Pregnancy resulting in a live birth.Results— Fecundabilities were 0.12 after GIFT, 0.018 after ovarian hyperstimulation and IUI, and 0.018 after IUI in a spontaneous cycle. The fecundability after IUI was no different from that which would be expected without treatment in these couples but fecundability was significantly better (P〉0.02) after GIFT.Conclusions— This trial does not support the use of IUI in the treatment of unexplained infertility but confirms the value of GIFT.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1471-0528.1991.tb15362.x
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  • 3
    Digitale Medien
    Digitale Medien
    Is GIFT (gamete intrafallopian transfer) the best treatment for unexplained infertility? (1991)
    Oxford, UK : Blackwell Publishing Ltd
    BJOG 98 (1991), S. 0 
    Details
    ISSN: 1471-0528
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: Objective— To compare the cumulative pregnancy rates after gamete intrafallopian transfer (GIFT) with the cumulative spontaneous pregnancy rates in couples with unexplained infertility.Design— A contemporaneous study in a single group of patients.Setting— Northern Regional Fertility Centre.Subjects— 76 couples with unexplained infertility of more than 3 years durationInterventions— Successful pregnancies were recorded during at least 3 months before GIFT and up to 21 months after a maximum of three cycles of GIFT treatment.Main outcome measures— Pregnancy resulting in a live birth.Results— Average monthly fecundability without treatment was 0.021 and after GIFT was 0.14 (P〈0.001). This was reflected as a cumulative pregnancy rate of 52% after three cycles of GIFT and 30% after 24 months without treatmentConclusions— The chance of having a baby after one cycle of GIFT is significantly greater than the chance in a spontaneous cycle. However, considering the cumulative pregnancy rates, we suggest that if GIFT is to be a realistic treatment option, it should be offered for more than one cycle.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1471-0528.1991.tb13449.x
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  • 4
    Digitale Medien
    Digitale Medien
    Anaesthesia for Proteus syndrome (1991)
    Oxford, UK : Blackwell Publishing Ltd
    Anaesthesia 46 (1991), S. 0 
    Details
    ISSN: 1365-2044
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: A 14-year-old boy with Proteus syndrome presented for orthopaedic surgery to his legs. No report in the literature exists on anaesthesia for this condition. Our patient posed airway problems that were managed by tracheal intubation under sedation using a fibreoptic bronchoscope. Anaesthesia was induced with thiopentone and maintained with nitrous oxide and isoflurane in oxygen. His lungs were ventilated mechanically throughout surgery, which was uneventful.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1365-2044.1991.tb09358.x
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  • 5
    Digitale Medien
    Digitale Medien
    Opisthotonus and other unusual neurological sequelae after outpatient anaesthesia (1990)
    Oxford, UK : Blackwell Publishing Ltd
    Anaesthesia 45 (1990), S. 0 
    Details
    ISSN: 1365-2044
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: Four patients who developed unusual neurological sequelae after outpatient anaesthesia are described. Propofol is strongly implicated as the cause. All four patients were female with no previous history of psychiatric disorder or neurological disease, unpremedicated, and had procedures of duration less than 20 minutes. Hyperreflexia and hypertonicity were present postoperatively and the reactions appeared to be triggered by an external stimulus. Three patients were examined by a neurologist and had a normal electroencephalograph. Two patients were on the same operating list; quality control was carried out on the anaesthetic agents used, and blood samples sent for toxicology showed no abnormalities. Mechanisms underlying these reactions are discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1365-2044.1990.tb14829.x
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  • 6
    Digitale Medien
    Digitale Medien
    Studies of Possible Preventative Effects of Prenatal Retinoic Acid Treatment on Genetic Birth Defects in Mice (1993)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 678 (1993), S. 0 
    Details
    ISSN: 1749-6632
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Allgemeine Naturwissenschaft
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1749-6632.1993.tb26141.x
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  • 7
    Digitale Medien
    Digitale Medien
    Decomposition kinetics of methyl- and n-propyldisilane (1992)
    s.l. : American Chemical Society
    Organometallics 11 (1992), S. 983-985 
    Details
    ISSN: 1520-6041
    Quelle: ACS Legacy Archives
    Thema: Chemie und Pharmazie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1021/om00038a077
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  • 8
    Digitale Medien
    Digitale Medien
    Immunophenotypic study of lymphocyte predominance Hodgkin's disease (1991)
    Oxford, UK : Blackwell Publishing Ltd
    Histopathology 18 (1991), S. 0 
    Details
    ISSN: 1365-2559
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: An immunophenotypic study of 17 cases of diffuse lymphocyte predominance Hodgkin's disease and 20 cases of nodular lymphocyte predominance Hodgkin's disease, along with eight of mixed cellularity and five of nodular sclerosing Hodgkin's disease, is reported. The atypical cells in nodular lymphocyte predominance Hodgkin's disease showed only minor differences from the published consensus. However, the atypical cells in diffuse lymphocyte predominance Hodgkin's disease showed an immunophenotype which was commonly B-cell positive (59%), but in a minority of cases (24%) or epithelial membrane antigen (12%) positive; none of the cases was Ber-H2 positive. These results do not differ greatly from our findings in nodular lymphocyte predominance Hodgkin's disease, but do diverge from the published consensus for diffuse lymphocyte predominance Hodgkin's disease. The question as to whether morphology or immunophenotype should form the primary diagnostic criterion for the definition of lymphocyte predominance Hodgkin's disease is discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1365-2559.1991.tb00809.x
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  • 9
    Digitale Medien
    Digitale Medien
    Granular cell variant of dermatofibrosarcoma protuberans (1990)
    Oxford, UK : Blackwell Publishing Ltd
    Histopathology 17 (1990), S. 0 
    Details
    ISSN: 1365-2559
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1365-2559.1990.tb00745.x
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  • 10
    Digitale Medien
    Digitale Medien
    Dermatofibrosarcoma protuberans recurring as a giant cell fibroblastoma with subsequent fibrosarcomatous change (1994)
    Oxford, UK : Blackwell Publishing Ltd
    Histopathology 24 (1994), S. 0 
    Details
    ISSN: 1365-2559
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1365-2559.1994.tb01310.x
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