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Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
<i>Pluchea lanceolata</i>: A Noxious Perennial Weed
No full textPluchea lanceolata(DC.) C. B. Clarke # PLULA is an aggressive, pernicious, rhizomatous evergreen weed in the Asteraceae. In other literature,P. lanceolataOliv. & Hiern has also been mentioned (Anonymous 1992, pp. 731 and 1147). With heavy root branches and dense subterranean parts,P. lanceolatais a common weed of sandy and saline tracts of the dry plains of the northwestern parts of India (Dakshini and Sabina 1981; Inderjit 1993; Rice 1995). It also occurs in North Africa, Afghanistan, and Pakistan (Nasir and Ali 1972; Oliver 1885). In India, it occurs both in cultivated and uncultivated areas. It causes considerable damage to winter and summer season crops. The control measures through conventional methods such as deep plowing, burning of aboveground parts, and herbicides are found to be unsuccessful. This rapidly spreading perennial weed apparently cannot be used for forage because of its disagreeable bitter taste (Anonymous 1976). Allelopathy has been reported as a probable cause ofP. lanceolatainterference (Inderjit and Dakshini 1990, 1992b, 1994a, 1994b, 1996a, 1996b; Inderjit et al. 1996).</jats:p
Allelopathic potential of <i>Verbesina encelioides</i> root leachate in soil
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