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PHYSICOCHEMICAL STUDIES OF SOME TRIVALENT METAL β-DIKETONATES
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A SEMI-EMPIRICAL SELF-CONSISTENT FIELD MOLECULAR ORBITAL (SCF-MO) STUDY OF THE GROUND STATE PROPERTIES OF SUBSTITUTED NAPHTHALENE COMPOUNDS
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EVALUATION AND INHERITANCE OF SINGLE AND MULTIPLE RESISTANCE TO VIRAL DISEASES OF COWPEA (Vigna unguiculata (L.) Walp)
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A BIBLIO-TEXTUAL STUDY AND EDITION OF THE POEMS OF ANDREW MARVELL
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PRE-WAR AND WAR-TIME CONFLICT MANAGEMENT STRATEGIES OF THE NIGERIAN CIVIL WAR
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Page will reload when a filter is selected or excluded.- Bean common mosaic virus 1 results 1
- Biafra 1 results 1
- Conflict management strategies . 1 results 1
- Cucumber mosaic virus 1 results 1
- Cytoplasmic effects. 1 results 1
- Forty trivalent metal chelates of 2-thenoylacetone,2 thenoyltrifluoroacetone, 2-furoylacetone, 2-furoyltrifluoroacetone. benzoylacetone, benzoyltrifluoroacetone and nicotinoyltrifluoro— acetone (where metal(Hl) = Al, Crf Mn, Fe and Co) as well as some mixed ligand p-diketonate complexes of iron(IH), have been prepared and their spectroscopic and magnetic properties have been examined. Among the series of compounds studied, Al(fbd) Mn(fbd)3, AKtftbd), Co(tftbd)3, Cr(tffbd)3, Mn(tffbd)3, Co(tffbd)3, M(tbd)3, M(tfpybd)3 (where M = Al, Cr, Mn, Fe and Co ), Fe(bzac)2 (tftbd), Fe(tftbd)2(bzac), Fe(fbd)2(tbd)and Fe(tbd)2(fbd) have been investigated for the first time. The effects of 3-pyridyl, 2-thienyl, 2-furyl, phenyl and trifluoromethyl substituents have been discussed in relation to the lowest spin-allowed transition, п3- п4 and M-O,VC--O and VC--C-—C stretching vibrations. Substitution of a methyl group in 2,4-pentanedione - by a furyl ring, and a methyl group in 1-(2-furyl )-l,3-butanedione by a trifluoromethyl are found to strengthen the C---O and C —C—C and weaken the M—0 bonds of the chelate rings; while the 2-thienyl group shifts the M—O and C -- 0 to lower, and C---C to higher frequencies. The phenyl substituent, as expected, strengthens the M-O and C---C bonds and weakens the C--O bonds. The most sensitive M-0 stretching modes follow the order Co(lII) >A1(III) > Cr(III)> Mn (III) > Fe (III). However, the lowest spin-1llowed п3- п4 translation of the β-ketoenolate anion, although found to be metal sensitive, does not follow the same trend. Trifluoromethyl group substitution resulted in the bathochromic shift of the п3- п4 transitions. The ligand field energy parameters Dq,f (ligand)), B35 and β35 have been calculated and the following order of nephelauxetic effect in the ligands has been derived: Htffbd > Htbd > Hfbd > Hacac > Hbztfac > Htftbd > Hbzac > Htfpybd. While the spectrochemical series of the ligands depicted by the magnitude of f(ligand) parameter also follow:'.the orders tfpybd < bztfac < fbd < tffbd < tbd < acac ~ bzac < tftbd. The reflectance spectra and magnetic properties of these compounds revealed that they are very similar to the corresponding tris—(2,4—pentanedionato) metal(III) octahedral complexes. 1 results 1
- Joint-problem solving 1 results 1
- Multiple-resistance 1 results 1
- Nigeria experienced a civil war between 1967 and 1970 which claimed millions of lives on the Federal and Biafran sides. Studies exist on trend, execution and termination of the war but the pre-war and war time conflict management strategies have not been fully explored. This study therefore, examined the strengths and weaknesses of the various management strategies adopted by the conflict parties prior to the outbreak of hostilities as well as those employed during the war with a few to identifying lessons derived from the management strategies. The study adopted a qualitative approach, utilising a combination of descriptive and case study research designs. Data were obtained from primary and secondary sources. A total of six in-dept interviews were conducted with surviving war-time key actors and stakeholders from the Federal and Biafran sides. Two Focus Group Discussions were held in Enugu and Kaduna with war veterans. Archival materials were also consulted. Secondary data were collected from war-time memoirs, minutes of the Aburi accord, decrees, edicts and newspaper publications. A combination of content and descriptive mode of data analysis was employed. A mix of joint-problem solving and third party intervention strategies such as conciliation and mediation were adopted before the war commenced. The failure of these strategies to transform the conflict accounted for the optional strategy of confrontation and strategic withdrawal as the last resort. The leaders and parties to the conflict did not adopt compromise, cooperation and avoidance, but opted for competition as an alternative to joint problem solving. The inability to strike a balance between the cooperative and competitive orientation by the Biafran leader was fundamental to the failure of local and international concerted efforts to transform the conflict peacefully. This attitude made the 30 months war not only inevitable, but also unduly prolonged with devastating impact on both human and material resources. These were further complicated by the disposition of some of the mediators which created distrust between the disputing parties. The lessons from the conflict management strategies of the war are that the parties to the conflict were invariable not very experienced in understanding that the cost of war is enormous and more devastating than peace, which creates room for accommodation and joint problem solving. Also, strategic scenario analysis should include best, middle and worst case scenarios before making violent confrontation an option in any conflict. The pre-war and war-time conflict management strategies of the Nigerian civil war failed to achieve the desired result mainly because of the attitude and disposition of parties to the conflict. Leaders, therefore, need to be skilled in conflict management while dealing with intractable conflicts, so as to prevent its escalation. Efforts at peaceful management of conflicts should include compromise, accommodation, open-mindedness, trust and respect for human dignity. 1 results 1
- Nigerian civil war 1 results 1
- Southern bean mosaic virus 1 results 1
- The ground and excited state properties of naphthalene and some of its derivatives have been studied. The molecular orbitals were evaluated using the modified Huckel Molecular Orbital (HMO) theory and the calculated molecular properties such as dipole moments, electronic transition frequencies, have been compared with experimental values. The electronic absorption spectra of some of the compounds were further studied in detail as to their band systems and characteristics, solvent polarity effects and hydrogen bonding effects. The dipole moment changes from ground to excited states were generally determined to be high. A linear regression analysis obtained for plots of the 'L(b) band maxima (υ(obs) versus solvent physical properties and solvent empirical parameters has shown that there is no meaningful correlation between solvent dielectric constant (ɛ) and solvent induced shifts. The oscillator strengths have been found to be generally low for the examined compounds in all the solvents. However, the electronic relaxation times calculated for each of the compounds give strong indication as to the likelihood of the band systems arising from mixed states. The relationship between relaxation times, t, and solvent viscosities,ᶯ, allows the prediction of large changes in spherical symmetries of the two band systems ('La and ’Lb) in both 1-naphthylamine and 4-nitro-l-naphthylamine. A possible existence of free internal rotation in the excited states of these molecules, has thus been suggested. The infrared spectra have been studied in the solid state and in solution and the vibrational frequencies assigned by making correlations with spectra of substituted benzene compounds and other related compounds. The substituent modes for each of the compounds have been discussed in detail. 1 results 1
- The introduction of recent bibliographic techniques into editorial practice raised hopes of finally finding objective solutions to many seemingly insoluble textual problems. Yet as the eminent bibliographer Fredson Bowers points out (Bibliography and Textual Criticism, 1964) such hopes - either because the techniques are still not completely developed, or because of their inherent limitations - have not been fully realised. Walter Greg, another pioneer in the field, had earlier warned that the new techniques could not be expected to carry the textual critic the whole way to perfection (Bibliography - An Apologia, 1932). The present thesis represents an attempt to apply the techniques to, and to overcome their limitation in, the editing of Marvell’s poems - with what success the sequel will show. Chapter 1 considers the circumstances surrounding the first printing of most of Marvell’s poems in 1681 at the instance or with the connivance of that Mary Palmer who falsely claimed to be his widow. It is shown that certain items intended for inclusion in the Miscellaneous Poems were cancelled because o£ the political upheavals of the year; that these cancelled poems deal with Cromwell and would have been likely to mind the public at the Civil war and the Regicide at a time when repetition of both catastrophes had been narrowly averted; that because the cancellations, the 1681 edition actually survives in three states. It is further suggested that the volume was printed by ‘casting-ort’ the copy, that, during printing, other materials not supplied by Mary Palmer were added, and that none of those directly concerned with the printing can be expected to have exercised salutary control over the process of publication. Chapter 2 discussed the various theories of textual criticism evolving from editorial practices in the fields of Biblical, Classical, and Modern Bibliographical scholarship. The objective common to all three is the determining of the text closest to the author's original by tracing the descent of surving copies through the use of various methods: by Dom Quentin's theory of intermediaries, by Paul Maas’s system of stemmatics, by Walter Greg’s calculus of variants and the like. For Marvell, with only one edition to be followed, the common problem of preferring one of a series of early editions does not exist; the real difficulty is to ascertain the poet’s own intention whenever there is a cause for doubt, always bearing in mind the not-too-favourable ambiences of poems either published posthumously or circulated anonymously. In addition to the problem of establishing Marvell’s intention in authenticated poems attributed to his authorship. The conclusion is that because of the peculiarities of transmission and survival, an edition of Marvell’s poem must necessarily be based not upon one but upon several methods of approach. Chapter 3 examines the background and technique of the ‘copy-text|’, the use of which is made obligatory by the repeated successes of the bibliographic school of textual critics in its application to earlier English works. Where only one copy of questionable superiority can be singled out, no one need quarrel with this technique; difficulties begin to arise when there are several copies of comparable authority available. To insist upon a ‘copy-text’ even in this case is justified by what Greg calls the ‘accidentals’ of a text (i.e. the spelling modes, the punctuation system, etc.). It is even more justified when it ensures that a modern edition retains significant ‘accidentals’, whatever they be, to the point where all linguistic traits of the author’s period, all significant indications of linguistics and philological peculiarities, whether temporal, or social, or private, should be transmitted through the text. In case of Marvell, the setting-up of a ‘copy-text’ without thorough exploration of ‘accidentals’ is scarcely feasible. That completed, the final question is the degree to which the results of the exploration, the resolutions of the difficulties it reveals, must be followed. Chapter 4 considers many of the peculiarities of the English language in Marvell’s time, particularly those (consequent upon the tangle of vowel-shifts known as the Great Sound Shift) which have immediate effectiveness for the ‘copy-text’ technique. Thanks to research by philologist-linguists like Luich, Sweet, Wyld, Whitehall, Dobson, Nist, Trager- Smith, et al., the overall pattern of Early Modern English, particularly that of the sonantal system, emerges with some clarity. Here, the results are schematized on a phonetic basis, and the confusions that might confront an editor, especially those reflected on spellings and rhymes, are broadly charted. From this exercise emerge several linguistic guide-lines to be followed, or at least considered in editing Marvell. Chapter 5 attempts to demonstrate how the study of para-linguistic factors of metre, rhythm, rhyme, and repetitive sound-patterning facilitates the editorial task, especially for rhymed verse. Here the metre and rhythms of Marvell’s verse are analysed in some detail and from several point of view. The most obvious prosodic feature is the maintenance of a strict syllable count- so strict that any apparent violation can be attributed to an error of transmission. In the octosyllabic couplet, his favourite form, Marvell not only makes good use of traditionally accepted variations, modulations, and metrical equivalences but is also able to absorb into his verse the principles of the ‘Classical plain style,’ the so-called sermo. In him, this is not merely a matter of achieving post-Elizabethan elegance and colloquial ease of diction and syntax; it also, and more importantly, involves the natural ordering of syntactic units in such a fashion that the pauses bordering segmenting them can be varied as freely and unaffectedly in verse as they normally are in prose and speech- all these within the strict metrical framework of syllable count. As a result, there is remarkable free positioning of the ‘caesuras’, which fall at various places in a line after odd- as well as even-numbered syllables and not- as advocated by certain Elizabethan posts and authorities- in a fixed medial position. Following the method of Ants Oras (Pause Patterns in Elizabethan and Jacobean Drama, 1960), an attempt is made to graph pause distribution profiles for the two famous poems “To His Coy Mistress” and “AN Horatian Ode” on the basis of both printed punctuation and syntactic analysis of actual readings. Chapter 6 brings forward the argument that capitalization is a device employed to indicate emphasis- particularly in stress bearing words of a poem- and is therefore an important ‘accidental’ to be reckoned with in editing verse. This fact is revealed in the analysis of Marvell’s On a Drop of Dew, and is confirmed by the practice of contemporary poets, by printing practice, and by statements of primers at tile time. What emerges is that this poem as printed in 1681 (and probably some other poem), seems to have fewer printed capitalized words than appeared in the original manuscript. In editing the poems, while it may not be possible to restore all the capitalization that Marvell intended, it is at least possi1ble to detect words wrongly capitalized, if they destroy what seems to be the intended rhythm and sense. Chapters 7 to 9 deal with the problem of attributing to Marvell some poems written anonymously. In Chapter 7 the various methods of determining the authorship of disputed works are reviewed. These fall into two main groups: internal evidence of style and ideas, the external evidence of direct statements by the author or his contemporaries, or statements from letters, diaries, and so forth. For Marvell external evidence is found to be rather weak – sometimes a contradictory. Internal stylistic evidence is relatively unhelpful mainly because the characteristic styles of the lyrical poems are different from those of the political poems. On the other hand, evidence from ideas seems important because of the feasible comparison between the views expressed in his prose written and those in the political poems. For this purpose, Marvell’s activities and attitudes as a politician are examined in Chapter 8. The picture given is that of a loyal citizen with a deep reverence for law and the constitution and a strong belief in the providential guidance of affairs of state. In a mixed constitution such as that of England at the time when the political poems were written, Marvell was determined to support equally the prerogatives of the King and the privileges of Parliament; and rejected any section – from parliament or King - that might upset the balance. -Finally, in Chapter 9, the political poems attributed to Marvell are re-examined individually. After this consideration, only four of the sixteen poems printed by Margoliouth - The Last Instructions, The Loyall Scott, Bludius et Corona and Scaevola Scoto-Brittannus –are found to be fully acceptable as Marvell’s. Four others – Clarendon’s House-Warming, Britannia and Rawleigh, and the Second and Third Advices are probably his. All the others, it appears, have been wrongly ascribed to him. 1 results 1
- Viral diseases usually occur as multiple infections and significantly reduce yield in cowpea. Planting resistant cowpea varieties is economical and effective in controlling viral diseases. However, information on mode of inheritance of virus resistance required for cowpea breeding programmes is limited. Thus, single and multiple resistance and inheritance patterns of resistance to viral diseases were investigated in some selected cowpea breeding lines. Nine cowpea genotypes comprising eight improved lines and Ife brown (susceptible check) were evaluated for resistance to Bean common mosaic virus-blackeye cowpea mosaic strain (BCMV-BlCM), Southern bean mosaic virus (SBMV) and Cucumber mosaic virus (CMV) in Screenhouse and Field Experiments (SaFE) in IITA, Ibadan. Virus identity was confirmed by RNA sequence similarity search in GenBank databases using BLASTN. Cowpea seedlings were mechanically inoculated seven days after sowing with viruses in 8 viral treatments comprising single and mixed infections. Pots were arranged in 8 by 9 factorial experiment in a completely randomised design (r=3). Disease incidence and severity data were taken at weekly intervals for eight Weeks Post-Inoculation (WPI). Cowpea leaf samples were tested for viruses at five WPI using Enzyme Linked Immunosorbent Assay with negative results confirmed by Polymerase Chain Reactions. Yield parameters were taken while seeds from infected cowpea plants were tested for seed-transmitted viruses. In field evaluations, cowpea lines were planted (r=4) using inoculated Ife brown as spreader rows. Cowpea lines were classified into resistant/susceptible plants using data from disease severity, area under disease progress curves and virus detection test. Two resistant/tolerant and two susceptible cowpea lines were selected and crossed. Parental lines, F1, F2, BC1 and BC2 were evaluated for virus resistance. Data were analysed using chi-square, ANOVA and PPMC at p=0.05. Virus identity revealed 92%, 95% and 98% homology to SBMV, BCMV-BlCM and CMV respectively. Disease severity in SaFE was negatively correlated with number of pods/plant (r= -0.9, -0.8), seeds/pod (r= -0.8,-0.6) and total seed weight (r= -0.6,-0.7). Higher seed transmission rates were observed for CMV (2-26%) and BCMV-BlCM (2- 25%) than SBMV (0-2%). Cowpea line IT98K-1092-1 had multiple-resistance to BCMVBlCM and SBMV and tolerance to CMV while IT97K-1042-3 showed multiple-resistance to BCMV-BlCM and SBMV. Lines IT97K1069-6 and IT04K-405-5 showed single UNIVERSITY OF IBADAN LIBRARY iii resistance to SBMV. However, IT99K-1060 and IT98K-503-1 were susceptible to the three viruses while other genotypes were susceptible to one or two viruses. Goodness-offit for 1 resistant to 3 susceptible segregation ratios ( 2 =1.28) indicated that inheritance of resistance to BCMV-BlCM is controlled by a single recessive gene pair in IT97K-1042-3. Segregation ratios 15 resistant to 1 susceptible plants ( 2 =0.30 and 1.39) suggested that duplicate dominant genes conditioned resistance to SBMV and tolerance to CMV in IT98K-1092-1. Reciprocal crosses supported the monogenic and digenic natures of inheritance and indicated absence of maternal or cytoplasmic effects. Some cowpea lines showed single resistance to Southern bean mosaic virus while some had multiple-resistance to the viruses. Inheritance patterns were monogenic or digenic. The most promising line can be released as a new variety after further trials or its resistance genes introgressed into a susceptible higher yielding variety. Keywords: Multiple-resistance, Bean common mosaic virus, Southern bean mosaic virus,Cucumber mosaic virus, Cytoplasmic effects. Word count: 499 1 results 1
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