58,343 research outputs found
Haplotype characterization and markers at the barley Mlo powdery mildew resistance locus as tools for marker-assisted selection
No full textRecessive mlo alleles of the barley Mlo gene confer resistance to almost all known isolates of the powdery mildew fungal pathogen targeting barley (Hordeum vulgare). To characterize haplotypes present in the Mlo chromosomal region of cultivated Mlo and mlo barley genotypes, weconducted a polymorphism search in 3 predicted low-copy sequence regions adjacent to the Mlo gene by examining a sample of 4 Mlo and 3 mlo cultivars. Eight singlenucleotide polymorphisms (SNPs) and 1 insertion–deletion (indel) were detected, and easy to use PCR-based markers were developed for typing the SNPs. The PCR markers were used to characterize a collection of 46 Mlo and 25 mlo barley cultivars, identifying 3 distinct mlo-11 haplotypes, 1 mlo-9 haplotype, and 4 Mlo haplotypes. We summarized the haplotype and marker information obtained here and in a previous study to help breeders identify strategies for mlo marker-assisted selection. The ability of the markers to identify mlo-resistant genotypes in segregating populations was demonstrated using 2 resistance-characterized F2 populations derived by 3-way crosses.G Tacconi, V Baldassarre, N C Collins, D Bulgarelli, A M Stanca, G Val
La phylogénie du Maïs.
No full textCollins G. N. La phylogénie du Maïs.. In: Revue de botanique appliquée et d'agriculture coloniale, 15ᵉ année, bulletin n°172, décembre 1935. pp. 1109-1119
Sanderson (G. N.). England, Europe and the Upper Nile, 1882-1899
No full textCollins Robert O. Sanderson (G. N.). England, Europe and the Upper Nile, 1882-1899. In: Revue belge de philologie et d'histoire, tome 45, fasc. 3, 1967. Langues et littératures modernes — Moderne taal- en letterkunde. pp. 947-954
Mountfort G. — The Hawfinch. London, The New Naturalist, Monograph n° 15, Collins, 1957
No full textBourlière François. Mountfort G. — The Hawfinch. London, The New Naturalist, Monograph n° 15, Collins, 1957. In: La Terre et La Vie, Revue d'Histoire naturelle, tome 11, n°2-3, 1957. p. 264
Corporate governance and performance in socially responsible corporations: New empirical insights from a neo-institutional framework
No full textResearch Question/Issue:This paper investigates the relationship between corporate governance (CG) and corporate social responsibility (CSR), and consequently, examines whether CG can positively moderate the association between corporate financial performance (CFP) and CSR.Research Findings/Insights:Using a sample of large listed corporations from 2002 to 2009, we find that, on average, better-governed corporations tend to pursue a more socially responsible agenda through increased CSR practices. We also find that a combination of CSR and CG practices has a stronger positive effect on CFP than CSR alone, implying that CG positively influences the CFP-CSR relationship. Our results are robust to controlling for different types of endogeneities, as well as alternative CFP, CG and CSR proxies.Theoretical/Academic Implications:The paper generally contributes to the literature on CG, CSR and CFP. Specifically, we make two main new contributions to the extant literature by drawing on new insights from an overarching neo-institutional framework. First, we show why and how better-governed corporations are more likely to pursue a more socially responsible agenda. Second, we provide evidence on why and how CG might strengthen the link between CFP and CSR.Practical/Policy Implications:Our findings have important implications for corporate regulators and policy-makers. Since our evidence suggests that better-governed corporations are more likely to be more socially responsible with a consequential positive effect on CFP, it provides corporate regulators, managers and policy-makers with a new impetus to develop a more explicit agenda of jointly pursuing CG and CSR reforms, instead of merely considering CSR as a peripheral component of CG or as an independent corporate activity.Keywords: Corporate Governance, Corporate Social Responsibility, Corporate Financial Performance, Neo-Institutional Theor
Geritola wardi Safian & Collins, sp. n.
No full textGeritola wardi Sáfián & Collins sp. n. (Figs 1 E, F, 2 C, D, 3 C) Holotype. ♂ Uganda, Radio Hill, Mabira Forest 6. II. 2011. Leg. P.R.F. Ward. Gen. prep.: SAFI 00073 (deposited in the ABRI collection, genitalia stored in micro-vial and pinned to specimen). Coordinates: 0° 23 ' 20.10 "N, 33 °0' 39.85 "E. Elevation: 1340 m. Allotype. ♀ Uganda, Mabira Forest, Jinja V. 1999. Leg. Steve Collins (deposited in the ABRI collection). Paratypes. 5 ♂ Uganda, Radio Hill, Mabira Forest. 9.I. 2011 and 9.VII. 2011. Leg.: P.R.F. Ward (in coll.: ABRI), 2 ♂ Radio Hill, Mabira Forest, Uganda. 1-2.V. 2011. Leg.: Peter Ward & Szabolcs Sáfián (deposited in the ABRI and Sáfián’s reference collections). Description of the holotype. Forewing length: 16.5 mm. Antenna: 8 mm. Approximately half of the forewing upperside is shiny light blue typical of Geritola, covering most of spaces 2 dA, Cu 2 and the discoidal cell, slightly less in spaces Cu 1, M 3 and M 2. The blue area broadens evenly on its outer margin from vein M 2 to vein C 2, being, again, slightly narrower in space 2 dA. The outer margin of the blue patch is broken up by black scaling along veins 2 dA, Cu 2, Cu 1, M 3, forming lobes or “fingers” of blue with their evenly rounded tip. The apex of the forewing is fairly narrow, the termen is almost straight or even slightly concave; the length of the swollen section of vein 2 dA is shorter than half of the vein, 6 mm on the holotype. The hindwing upperside is mostly covered with light, iridescent blue scaling, leaving only spaces M 1, R s and Sc+R 1 without blue. The colour of the wing in space R s is black, turning lighter greyish towards the costa. The hindwing has only a very fine black margin (restricted mostly to the cilia) between the apex and the tornus. The underside is dirty white, without the usual mottled Geritola pattern. Only shades of light brown sub-marginal lines on the forewings are visible. Genitalia. The general appearance of the genitalia is similar to those of other Geritola. The uncus is blunt, hood-like, without any projections. It is densely covered with fine hairs. The subunci are rather short and very narrow, scythe-like and not hooked at their tip. The valvae are rather slender with even, gently curving edges; they do not show any projections, apart from a prolonged lobe on the tips, which taper downwards. The tip of the lobe is curved from the dorsal side, although its edge is even and gently curving on the ventral side. The aedeagus is relatively broad with a spear-like tip, but it broadens significantly towards the middle-section with a sharp break on the dorsal side, but rather flatter on the ventral side. It narrows down again, sharply towards its basal tip, with an even edge. Description of the allotype. Forewing length: 19 mm. Antenna: 9.5 mm. Approximately half of the forewing upperside is pale blue, forming an irregular triangle from the base along the inner margin almost to the tornus and to the middle of the space between M 3 and M 2 beyond the discoidal cell. The costa, the apex and the outer margin are paler black. The hindwing is almost entirely covered with pale blue scales, leaving the costa greyish, without any blue scaling beyond vein M 1. The blue area is very slightly paler, rather silvery in the post-discal and submarginal area of the hindwing, also on the forewing beyond the discoidal cell. The hindwing has a very narrow black-brown margin (1 mm), broadening slightly at the apex. The underside is dirty white, with only traces of yellowish shades of the usual mottled Geritola pattern, rather than real lines. Diagnosis. The male of G. w a rd i is slightly smaller than G. nitidica (wingspan of holotypes 34 mm and 38 mm respectively), and the termen of its forewing is straight or slightly concave; the termen of the forewing is slightly convex in G. nitidica and G. pacifica. The swollen section of vein 2 dA on the forewing is always longer than half the length of the vein in G. nitidica, while it is shorter than half the length of the vein on all males of G. w a rd i. On the forewing, the blue area does not broaden evenly in G. nitidica, being broader in spaces between 2 dA, Cu 2 and M 3, M 2. The outer edge of the blue area in G. pacifica is not conspicuously separated by the black scales along the veins, forming lobed tips, as in the case of G. w a rd i, apart from the space between veins M 3 and M 2. The blue area between Cu 2 and M 3 even has a squat outer edge, which is never the case in G. w a rd i. The male holotype of G. pacifica (described above) has the blue area on the forewing rather even in width, apart from the inner margin, where the blue extends further towards the tornus, leaving only a 2 mm black margin. In G. pacifica, the lobes or “fingers” at the outer edge of the blue area in the spaces have narrower tip, as the black scaling conspicuously intervene the blue area along the veins. The swollen section of vein 2 dA on the forewing in G. pacifica is also longer than half of the vein length, and the hindwing has a broader black margin (1 mm, similarly to that of G. nitidica). Male genitalia of G. w a rd i are very different from those of G. nitidica and G. pacifica, especially the subunci, which are significantly shorter than in the other two species, and the tip of the valvae, which are pointed in G. wardi but evenly rounded in both G. nitidica and G. pacifica. The females of G. nitidica and G. wardi are also similar, but despite their relatively unmarked, uniformly white underside, they are rather easy to distinguish. While G. w a rd i has only a narrow (1 mm along the outer margin, broadens to 2 mm at the apex) black-brown margin on the hindwing upperside, G. nitidica has a broad black-brown margin at the apex (4 mm) and no well-defined margin at all. In G. nitidica, the outer edge of the blue scaling on the hindwing is very diffuse, dusting the 4-5 mm broad blackish marginal area with pale blue scales. The tone of the blue is also uniform in G. nitidica and not changing to lighter, almost whitish-blue from the base towards the edge, which is very characteristic to G. w a rd i. Discussion. G. w a rd i was found only in the Mabira Forest in Eastern Uganda, which is an eastern outlier forest of the Congolian rainforest zone, with slightly impoverished but rather specialised butterfly fauna. Although no comprehensive publication dealing with the butterflies of Mabira exists, many records in the ABRI collection and in recent scientific papers prove that Mabira constitutes the eastern boundary of the distribution of many rainforest species or species groups, including a few of restricted range, e.g. Pseudopontia mabira Mitter & Collins, 2011 and Pseudaletis barnetti Libert & Collins, 2013 (Mitter et al. 2011, Libert & Collins 2013). G. w a rd i might be among the species of biogeographic importance, as it is quite unlikely that it had been overlooked during the extensive collecting in the Congo Basin. Etymology. It is a pleasure to name this beautiful Geritola after Peter Ward, a fellow lepidopterist and a good friend from South Africa, who first found G. w a rd i at the radio masts in Mabira Forest, Uganda (referred to as Radio Hill). Peter has a never-cooling enthusiasm for butterflies and a good sense of finding hill-tops, where Epitola sensu lato and other Lipteninae congregate to display.Published as part of Sáfián, Szabolcs, Collins, Steve C. & Libert, Michel, 2015, Two new species in the genus Geritola Libert, 1999 (Lepidoptera: Lycaenidae, Epitolini), pp. 286-292 in Zootaxa 3931 (2) on pages 288-291, DOI: 10.11646/zootaxa.3931.2.8, http://zenodo.org/record/24377
Dietary sodium inhibits aqueous copper uptake in rainbow trout (Oncorhynchus mykiss)
No full textOurs is the first study to demonstrate an influence of dietary sodium on waterborne copper uptake in fish. We examined possible interactions between dietary sodium and the response of freshwater rainbow trout (Oncorhynchus mykiss) to waterborne copper in light of recent evidence of interactions between sodium and copper metabolism in the gills. Trout were maintained for 6 days on one of four diets of increasing sodium concentration (0.25 mmol g(-1), 0.51 mmol g(-1), 0.76 mmol g(-1) and 1.27 mmol g(-1), which corresponds to 0.6%, 1.2%, 1.8% and 3% sodium by mass, respectively). At the end of 7 days, fish were exposed for 6 h to waterborne copper spiked with (64)Cu to determine if the dietary sodium affected responses to a subsequent short-term waterborne copper exposure. The radiotracer allowed us to distinguish between Cu occurring in fish tissues before the experiment and 'newly accumulated' Cu arising from the experimental exposure. Dietary sodium concentrations of 1.8% or 3% reduced newly accumulated copper concentrations in gill (from 93.9 ng g(-1) in control to 38.9 ng g(-1) and 20.0 ng g(-1) in fish fed 1.8% or 3% Na(+)-supplemented diets, respectively), liver (from 64.3 ng g(-1) to 23.1 ng g(-1) and 7.5 ng g(-1), respectively), kidney (from 29.3 ng g(-1) to 11.7 ng g(-1) and 7.8 ng g(-1), respectively), plasma (from 64.7 ng g(-1) to 21.5 ng g(-1) and 10.7 ng g(-1), respectively) and gut (from 6.8 ng g(-1) to 3.4 ng g(-1) and 2.2 ng g(-1), respectively) by 50.0-88.2%. The 3% Na(+)-supplemented diets also increased plasma and gut sodium concentrations by 38.1% (from 137.1 micromol g(-1) to 189.3 micromol g(-1)) and 104.3% (from 56.5 micromol g(-1) to 115.4 micromol g(-1)), respectively, relative to fish maintained on untreated diets. Whole body uptake rates of both sodium and copper were significantly reduced, and highly correlated (r=0.97) with one another, in fish fed high-sodium diets relative to controls. Moreover, sodium efflux was 12% and 38% higher in fish fed 1.8% and 3% sodium-enriched diets, respectively. Fish fed high-sodium diets also drank more water, but the contribution of drinking to waterborne copper uptake was negligible. From these results, we speculate that, at least in part, aqueous sodium and copper share a common branchial uptake route, probably through an apical sodium channel. According to this hypothesis, as the channel is downregulated with increasing internal sodium concentrations, both sodium and copper uptake from the water are inhibited.LR: 20061115; PUBM: Print; JID: 0243705; 0 (Sodium, Dietary); 7440-50-8 (Copper); EC 3.6.1.37 (Na(+)-K(+)-Exchanging ATPase); ppublishSource type: Electronic(1
Butler C. G. — The World of the Honeybee. London, Collins, The New Naturalist, volume 29, 1954
No full textBourlière François. Butler C. G. — The World of the Honeybee. London, Collins, The New Naturalist, volume 29, 1954. In: La Terre et La Vie, Revue d'Histoire naturelle, tome 9, n°1, 1955. p. 59
Grey-Wilson, G. and Blamey, M. — The Alpine Flowers of Britain and Europe. London, Collins, 1979
No full textBourlière François. Grey-Wilson, G. and Blamey, M. — The Alpine Flowers of Britain and Europe. London, Collins, 1979. In: Revue d'Écologie (La Terre et La Vie), tome 34, n°4, 1980. p. 662
Herklots G. A. C. — The birds of Trinidad and Tobago. London, Collins, 1961
No full textBourlière François. Herklots G. A. C. — The birds of Trinidad and Tobago. London, Collins, 1961. In: La Terre et La Vie, Revue d'Histoire naturelle, tome 16, n°1, 1962. p. 106
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