منابع مشابه
Art.-Schultz (F)
Current theories view learning as the acquisition of specific predictions1–4. Humans and animals learn to predict the outcomes of their behavior, including rewards. Learning depends on the extent to which these outcomes are different than predicted, being governed by the discrepancy or ‘error’ between outcome and prediction. Outcomes that affect learning in this way are termed ‘reinforcers’. Le...
متن کاملMajor F. W. Cragg
It is with the deepest regret that we learn of the tragic death of Major F. W. Cragg, i.m.s., from typhus fever at Lahore on the 23rd of April, 1924. Major Cragg's death adds another name to the long but brilliant list of scientific investigators who have lost their lives in the prosecution of medical enquiries for the benefit of humanity. He died as truly on active service as did any officer k...
متن کاملF/W e+e- INTERACTIONS*
INTRODUCTION The field of e+e-interactions has provided a great deal of excitement in the past few years. 1-9 Primarily, interest has centered around the reaction +-ee-hadrons. This reaction is particularly attractive because we believe in electromagnetic perturbation theory, which implies that the cross section for hadron production is dominated by one photon annihilation of the electron and p...
متن کاملMorphological and Biological Parameters of the Knapweed Nematode, Subanguina picridis.
Specimens of the knapweed nematode Subanguina picridis (Kirjanova) Brzeski obtained from different host plants were highly variable in measurement and structure. This variability refutes the validity of six Subanguina species attacking plants in the Asteraceae.
متن کاملBiology of Subanguina picridis, a Potential Biological Control Agent of Russian Knapweed.
The knapweed nematode, Subanguina picridis, forms galls on the leaves, stems, and root collar of Russian knapweed, Acroptilon repens. After being revived from a dormant, cryptobiotic state, second-stage juveniles required at least 1 month in a free-living state before becoming infective. Galls were induced on relatively slow-growing host plants that retained their apical meristems at or near th...
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ژورنال
عنوان ژورنال: Annals and Magazine of Natural History
سال: 1848
ISSN: 0374-5481
DOI: 10.1080/03745485809494671