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  • 1
    Electronic Resource
    Electronic Resource
    Spin-polarized photoemission spectroscopy of magnetic surfaces using undulator radiation (1992)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 63 (1992), S. 1902-1908 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A beamline has been established at the National Synchrotron Light Source to perform angle-resolved photoemission experiments on magnetic surfaces with spin sensitivity. The system has two novel features: it uses a miniature electron-spin polarization analyzer and it also uses synchrotron radiation from an undulator rather than a bending magnet.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1143301
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Addition of droperidol to patient-controlled analgesia: effect on nausea and vomiting (1993)
    Oxford, UK : Blackwell Publishing Ltd
    Anaesthesia 48 (1993), S. 0 
    Details
    ISSN: 1365-2044
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: A double-blind trial of the effect of droperidol on the incidence of nausea and vomiting in patients using patient-controlled analgesia was carried out in 60 healthy women undergoing abdominal hysterectomy. After a standard anaesthetic including droperidol 2.5 mg as a prophylactic antiemetic, patients were randomly allocated to receive postoperative patient-controlled analgesia with either morphine alone (2mg.ml−1) or morphine (2mg.ml−1) with droperidol (0.2 mg.ml−1) added to the syringe. Verbal scores and visual analogue scores for nausea, vomiting, pain and sedation were made at 4, 12 and 24 h postoperatively, and any requirement for intramuscular prochlorperazine noted. There was no difference between the groups at any time in the amount of morphine consumed or in pain scores. At 12 h, patients receiving droperidol experienced significantly less nausea, and over the first 24 h, 31% required prochlorperazine compared with 59.3% of patients not receiving droperidol. The number of patients with sedation at 24 h was significantly greater in the droperidol group. We conclude that the addition of droperidol to morphine both reduces nausea and the need for further antiemetic treatment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2044.1993.tb07419.x
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Is the viceroy a batesian mimic? (1991)
    [s.l.] : Nature Publishing Group
    Nature 351 (1991), S. 612-612 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] SIR - Vane-Wright suggests1 that one of the most telling points against batesian mimicry is likelihood, on the grounds that chemical defence is more likely to evolve because it provides more reliable protection. We are not aware of any evidence that this argument is valid. Evolution is ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/351612a0
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  • 4
    Electronic Resource
    Electronic Resource
    Acquisition of immunity in cattle against the blue tick,Boophilus decoloratus (1991)
    Springer
    Experimental and applied acarology 11 (1991), S. 51-56 
    Details
    ISSN: 1572-9702
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract It is well known that ixodid ticks have the ability to induce immunity in their host. We demonstrate, for the first time, that the tickBoophilus decoloratus induced immunity in its bovine host, since the mean weight of engorged females fed on naive animals dropped from 201.5 mg, to 173.7 mg and 155.3 mg, for females fed on calves previously exposed once and twice, respectively, toB. decoloratus infestations. Ticks which had been transferred from one individual host to another one were able to complete their feeding period on a sensitive host. Such ticks were significantly heavier ( $$\bar x$$ 245.2 mg) than those fed on a naive ( $$\bar x$$ 201.5 mg) host for the entire normal feeding period. A negative correlation between the mean weight of the engorged female ticks and the level of serum gamma globulins in the host was also demonstrated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01193728
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  • 5
    Electronic Resource
    Electronic Resource
    Surface-associated glycosyltransferase activities in rat sertoli cells in vitro (1993)
    New York, NY [u.a.] : Wiley-Blackwell
    Molecular Reproduction and Development 36 (1993), S. 195-202 
    Details
    ISSN: 1040-452X
    Keywords: Fucosyltransferase ; Galactosyltransferase ; Sertoli cell plasma membranes ; Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology
    Notes: We have previously demonstrated fucosyltransferase (FT) activity on mouse germ cell surfaces at different stages of spermatogenesis. To complement these findings, here we report FT activity on the Sertoli cell (SC) surface. SC isolated and cultured from 20-day-old rat testes displayed FT activity with a Vmax of 12.5 pmoles/mg protein/min and a Km of 22 μM, while purified Sertoli cell plasma membranes (SCPM) showed FT activity with a Vmax of 10 pmoles/mg protein/min and a Km of 18.2 μM for GDP-[14C]-L-fucose. Fucosyltransferase activities were 16.7 and 2.6 pmoles/mg protein/min in SC and SCPM, respectively; 16% of FT activity is, therefore, on the cell surface. To test whether the expression of FT activity in SC was regulated by hormones and growth factors, SC were cultured in serum-free medium supplemented with insulin, transferrin, sodium selenite, and epidermal growth factor (medium 4F) or in 4F plus follicle-stimulating hormone, testosterone, hydrocortisone, and vitamin E (medium 8F). We found that FT activity in SC is not modulated by these hormones or growth factors (4F or 8F). For comparison with FT, galactosyltransferase (GalTase) activities in SC and SCPM were also determined. SC displayed GalTase activity with a Vmax of 50 pmoles/mg protein/min and a Km of 38.5 μM, while SCPM showed GalTase activity with a Vmax of 25 pmoles/mg protein/min and a Km of 20.8 μM for UDP-[3H]-galactose. Galactosyltransferase activities were 29.2 and 9.6 pmoles/mg protein/min in SC and SCPM, respectively. Therefore, ∼33% of the total cell GalTase activity was detected on the surface membranes of rat Sertoli cells. These results suggest that cell surface glycosyltransferases may be involved in Sertoli cell function during mammalian spermatogenesis. © 1993 Wiley-Liss, Inc.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrd.1080360210
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  • 6
    Electronic Resource
    Electronic Resource
    N-cadherin mediates sertoli cell-spermatogenic cell adhesion (1993)
    New York, NY [u.a.] : Wiley-Blackwell
    Developmental Dynamics 197 (1993), S. 1-13 
    Details
    ISSN: 1058-8388
    Keywords: N-cadherin ; Seminiferous tubules ; Cell-cell adhesion ; Sertoli cell ; Spermatogenic cell ; Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine
    Notes: The complex topological association of Sertoli cells and spermatogenic cells in the testis suggests the existence of cell surface adhesion molecules that regulate cellular interactions within the seminiferous epithelium. The recent report of N-cadherin mRNA expression in the mouse testis implies the involvement of this known adhesion molecule in testicular cell binding. Accordingly, here we report that (1) N-cadherin is found on the surface membranes of rat spermatogenic cells and on Sertoli cells, and (2) that N-cadherin is a partial mediator of Sertoli cell-germ cell adhesion as tested in an in vitro cell-cell binding assay. Antiserum directed against the N-cadherin cell adhesion recognition sequence was used for Western blot analysis of purified plasma membranes from Sertoli cells and from spermatogenic cells. Both membrane preparations exhibited reactivity at an appropriate Mr of about 130 kDa. In addition, immunofluorescence assays demonstrated that both germ cells and Sertoli cells were labeled by anti-N-cadherin. Finally, the antiserum was included in a cytometer-assisted cell-cell binding test to determine its inhibitory ability. The antiserum consistently reduced specific testicular cell-cell adhesion by 30%-50%. This is the first demonstration that antibodies directed against the cadherin cell adhesion recognition sequence are capable of inhibiting cell-cell interactions. Pre-incubation of either rat Sertoli cells or spermatogenic cells alone was sufficient to achieve statistically significant inhibition of intercellular adhesion. We conclude, therefore, that N-cadherin is expressed by both Sertoli cells and spermatogenic cells and that N-cadherin is one of a number of regulatory molecules mediating local cellular associations in the mammalian seminiferous tubule. © 1993 Wiley-Liss, Inc.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aja.1001970102
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