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Now showing items 41-50 of 60
Effects of experience on microcomputer use in primary schools : results of a second survey
(1988)
Following an initial survey of microcomputer use in Hertfordshire primary schools, a second, follow-up survey was conducted two years later to examine how experience had changed attitudes and use. This second survey provided ...
Infrared polarimetry of dark clouds. II : Magnetic field structure in the Rho Ophiuchi dark cloud
(1988)
K-band polarimetry of 20 sources embedded within the densest region of the Rho Oph dark cloud has been obtained. The degree of polarization ranges from 1.1 to 7.4 percent, and the position angles have a bimodal distribution, ...
Gene amplification and expression in plants by a replicating geminivirus vector
(1988-01-01)
The use of plant DNA viruses as vectors for the transfer of foreign genes to plants offers two potential advantages over other, existing methods of producing transgenic plants. First, these viruses sys-temically infect ...
Approximate expressions of maximum value of stress intensity factor of nozzle corner cracks
(1988-01-01)
Based on the flat plate-nozzle model loaded by uniform uniaxial tension, through some suitable reduction and approximation, the maximum value of stress intensity factor (K) along a crack front can be expressed by the weight ...
Systemic infection of petunia by mechanical inoculation with tomato golden mosaic virus
(1988)
Aangetoond werd dat Petunia hybrida systemisch kan worden geïnfecteerd met het 'tomato golden mosaic virus' (TGMV), een virus dat behoort tot de groep van de geminivirussen. Mechanische inoculatie van petuniaplanten met ...
The isolation of plant nuclei
(Humana Press, 1988)
Spectropolarimetry of the 3-micron ice band in Elias 16 (Taurus Dark Cloud)
(1988)
Polarization data between 1.2 and 3.8 μm, including spectropolarimetry in the 3-μm ice feature, are presented for the highly reddened field star Elias 16 in the Taurus Dark Cloud. The polarization is observed to increase ...
Forms of bovine pepsinogen in plasma from cattle with three different 'syndromes' of Ostertagia ostertagi infection
(1988-01)
Calves infected orally with third stage larvae of Ostertagia ostertagi or infected with adult O ostertagi by direct transplantation into the abomasum had raised plasma pepsinogen activity, as did four-year-old dairy cattle ...