4 Records out of 22207 Records

Characterization of East African accesions of Musa AAB ''apple and Musa AA ''Muraru'' dessert bananas

Author: Onyango, Margaret A

Awarding University: University of Hawaii, USA

Level : PhD

Year: 2007

Holding Libraries: Kenya Agricultural Research Institute Headquarters Library ;

Subject Terms: Bananas ; Musa spp ; Horticulture ; Pisum sativum ; Flow cytometry ; Deoxyribonucleic acid--DNA ; Classification ;

Abstract:

One of the major hindrances to future improvements in bananas and plantains production in East Africa is the endless range of names and synonyms used to describe different cultivars and the lack of understanding of their true biological relationships. The East African AAB 'Sukari Ndizi' and AA 'Muraru' dessert bananas are prime examples of this confusion. To better understand these two groups of bananas and to evaluate them for economically important traits, vital information such as the identity and distinctness of cultivars needed to be developed. This study had the following general objectives: (1) to use molecular and morphological tools to analyze the variation that exists within the East African AAB 'Sukari Ndizi' and AA 'Muraru' dessert bananas, (2) to classify AAB 'Sukari Ndizi' and AA 'Muraru' dessert banana cultivars into distinguishable groups for ease of reference and communication, (3) to identify their key characters for development of a provisional identification system, and (4) to identify superior AAB 'Apple' and AA 'Muraru' cultivars for production purposes. In this study, the classification of the East African AAB 'Sukari Ndizi' and East African AA 'Muraru' bananas was achieved using molecular microsatellite markers, morphological markers, flow cytometry ploidy analysis and horticultural trait evaluation. Microsatellite markers from both nuclear and chloroplast DNAs were useful for distinguishing the various bananas groups, and to separate 4 taxa of AAB 'Apple' dessert banana accessions using both cluster and principal component analysis. Using cluster analysis, the 'Sukari Ndizi' were classified as distinct taxon within the AAB 'Apple' dessert bananas. Flow cytometry analysis also confirmed that 'Sukari Ndizi' is triploid AAB and 'Muraru' is a diploid AA. Cluster analysis based on microsateUite data showed 'Muraru' to be distinct taxon from other AA accessions, and very closely related to the commercial AM dessert bananas. Morphological studies have also identified key characters exclusive to these two banana groups that can be used for development of provisional identification systems. Finally, horticultural analysis of several cultivars was carried out using various traits, and these cultivars can be recommended for further production in the region. This study demonstrated that microsateIIite markers are useful and powerful tools for banana classification and for the analysis of biological relationships. Flow cytometry determined the ploidy levels of the banana accessions. Analysis of variance of replicated accession samples and the USe of Pisum sativum as an internal standard with flow cytometry, made it possible to predict the actual genomic composition of various accessions.

Voices at the Junction : a novella and stories [Kenya]

Author: Tunai, Charles Kesero

Awarding University: University of Hawaii, USA

Level : PhD

Year: 2004

Holding Libraries: Dissertation Abstracts International ;

Subject Terms: Literature/English literature/Novels/ ;

Abstract:

The stories in Voices at the Junction are set in late 20 th and early 21 st century Kenya, take place within the home and show family conflicts and also discuss political issues. In the novella 'Voices,' four first-person narrators present different perspectives on the childlessness and adultery in a family. Chacha refuses to face the fact that he may be responsible for the lack of a child in his marriage; his wife conceives through one moment of adultery with her brother-in-law and she has to decide whether to keep the child or abort. She stays with the pregnancy and leaves the family. In 'Conversing' Mogesi receives a letter written to her husband by another woman, and this leads Mogesi to contemplate the significance of a girl-child vis-?-vis a boy-child. Her two children collaboratively erect a toy house, but this does not fully satisfy Mogesi because in her thinking, the responsibility of construction should be her son's alone, but the boy happens to suffer from cerebral palsy. 'The Lamp' and 'The Story' also tackle the symbol of house--Rioba and Nyangi respectively regard the buildings they are in as unsafe and inhibiting. The political stories, 'Counting' and 'Deadline,' depict the government as insincere. In the former story the old woman sees the darkness in her hut as the administration--now represented by the census officer--which has intruded into her space and peace. The census exercise is meaningless to her because no benefits have ever come from the past counts. In 'Deadline,' Weisiko sees the new I.D. as a rite of passage that will be useful to her, but she is unable to get the card because of her way of telling time and also due to government forces. The walking stick, which is a campaign symbol for Uncle who is a councilor, is like a hook that fishes the citizens to their death.

Gender physiology and the allocation of labor in subsistence households.

Author: Coleman, Susan Long

Awarding University: University of Hawaii, USA

Level : PhD

Year: 1997

Holding Libraries: University Microfilms International ;

Subject Terms: Labour economics ; Women's studies ; Metabolism ; Farming ;

Abstract:

This dissertation is a study of the inter-relationships between human physiology, the calorie costs of labor, and food production in the subsistence household with special emphasis on gender differences. Two economic models depicting the above relationships are formulated--one a cost minimizing model and the other a profit maximizing model. An empirical analysis follows which explores the effects of physiological and household characteristics on labor and calorie allocations using data from subsistence households in Kenya. The results of the study suggest: (1) physiological characteristics influence subsistence household labor and calorie allocation. (2) differences between males and females in the allocation of subsistence household labor and calorie allocation can be explained by physiological differences. (3) households may exhibit cost minimizing behavior that could lead to the perpetual overwork of women.

Salinity tolerance of the pineapple plant [Ananas composus[L]Merr.].

Author: Wambiji, Henry

Awarding University: University of Hawaii, USA

Level : MSc

Year: 1972

Holding Libraries: Egerton University Library ;

Subject Terms: Soils/Pineapples/Ananas comosus/Salt/ ;

Abstract:

ABSTRACT NOT AVAILABLE