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Characterization of ion implanted waveguides in Nd:YAG (1991)

Zhang, L. ; Chandler, P. J. ; Townsend, P. D. ; [et al.]

[S.l.] : American Institute of Physics (AIP)

Journal of Applied Physics 69 (1991), S. 3440-3446

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ISSN: 1089-7550

Source: AIP Digital Archive

Topics: Physics

Notes: Ion implantation into Nd:YAG has been used to produce waveguides which are capable of supporting laser action. The refractive index profiles have been characterized as a function of ion dose and energy, implant temperature, and subsequent thermal annealing. Transmission losses down to 1.2 dB/cm have been obtained in the optimized waveguides. There is a temperature independent index enhancement of ∼0.15% in the electronic stopping (guiding) region. The nuclear collision damage is temperature dependent, and shows an initial index increase (∼0.3% for dose 1 × 1016 ions/cm2), but a subsequent decrease of up to several percent, which forms an optical barrier, as has been observed in many other crystalline materials. The best mode confinement and attenuation is obtained by utilizing the low dose nuclear index enhancement produced by several equally spaced implants (multiple energy) to give a broad well with Δn∼0.25%. Several unusual features of the profiles are reported and discussed.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1063/1.348962

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Actin in the merozoite of the malaria parasite, Plasmodium falciparum (1993)

Field, S. J. ; Pinder, Jennifer C. ; Clough, Barbara ; [et al.]

New York, NY : Wiley-Blackwell

Cell Motility and the Cytoskeleton 25 (1993), S. 43-48

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ISSN: 0886-1544

Keywords: malaria ; Plasmodium falciparum ; merozoite ; actin ; ubiquitin ; Life and Medical Sciences ; Cell & Developmental Biology

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Biology , Medicine

Notes: Merozoites of the human malaria parasite, Plasmodium falciparum, when treated with cytochalasin B, will attach irreversibly to red cells with formation of a vestigial internal (parasitophorous) vacuole, but they are inhibited from moving into the cell. The existence of an actin-based motile mechanism is implied. Immunoblotting, peptide mapping and the DNase inhibition assay have been used to show that the merozoite contains actin. It makes up an estimated 0.3% of the total parasite protein and is partitioned in the ratio of about 1:2 between the cytosolic and particulate protein fractions. In the former it is unpolymerised and in the latter filamentous. Most of the anti-actin-reactive protein in the soluble fraction and about 20% of that in the pellet has an apparent molecular weight of 55,000 and reacts with an anti-ubiquitin antibody; it is thus evidently ubiquitinyl actin, or arthrin, which has so far been detected only in insect flight muscle. © 1993 Wiley-Liss, Inc.

Additional Material: 5 Ill.