87 research outputs found
Descriptive characterization of a Nigerian heterogeneous rabbit population - factors affecting litter traits
Full text link[EN] This study evaluated the effect of female body weight at conception (FWC), season of mating (SM), type of mating (TM) and litter size at birth (LSB) on the litter performance in a heterogeneous Nigerian population of rabbits. Data on 116 litters from 10 bucks and 48 does across three parities were analysed. Reproductive traits evaluated included LSB, number born alive (NBA), litter sizes and weights at 7, 14 and 21 d post-kindling, pre-weaning survival rate (SR) and daily weight gain of kits from kindling to weaning (DWG). A fi xed linear model that included FWC (light and heavy does), TM (homospermic and heterospermic matings), LSB classes (low, medium and large) and SM (rainy or dry) was used. Results showed that heavier does at concenption showed higher performance for LSB and NBA (P<0.05) than lighter does. Average weight of kits at kindling and at 28 d, as well as kit SR and DWG, were signifi cantly higher in low-sized litters, when compared with intermediate- and large-sized litters (P<0.05). LSB, NBA and litter size at weaning were higher in litters produced by heterospermically mated does compared with homospermically mated does. Season of mating affected LSB and NBA (P<0.05), being signifi cantly larger the litters in the rainy season.The authors gratefully acknowledge the International Foundation for Science (IFS) of Sweden for its financial support (through grant B3871-1). The efforts and assistance of Jimi Talabi and Nike Olabode in data collection are appreciated.Oseni, S.; Ajayi, B. (2010). Descriptive characterization of a Nigerian heterogeneous rabbit population - factors affecting litter traits. World Rabbit Science. 18(2). https://doi.org/10.4995/WRS.2010.18.1418
Genetic diversity and fungicide sensitivity of Rhizoctonia solani associated with soybean seedling disease
Full text linkRhizoctonia solani, a ubiquitous and genetically diverse fungus, is an important seedling pathogen of soybean in North America. With the dearth of commercial soybean varieties marketed for resistance to members of this species, seed treatment fungicides have become increasingly important as a management option. However, our knowledge of the groups associated with soybean seedlings, the genetic structure of the pathogenic groups, as well as their potential for adaptation to fungicide seed treatments, is very limited. To bridge this knowledge gap, we characterized, using conventional and molecular techniques, Rhizoctonia isolates collected from farmers’ fields in the U.S. and in Canada to identify the predominant and most aggressive groups. Three taxonomic groups were identified: R. solani, R. zeae, and the binucleate Rhizoctonia. The R. solani isolates comprised members of anastomosis groups (AG) 2-2IIIB, 3PT, 4 HGI, 4 HGIII, 7, and 11. Isolates of AG-2-2IIIB were the most frequently recovered and the most aggressive on soybean and corn. Using single nucleotide polymorphism markers identified from genotyping-by-sequencing approach, the genetic structure of the populations of AG-2-2IIIB from Illinois, Ohio, and Ontario was assessed for clues about the pathogen’s reproductive biology and to determine if the pattern of genetic variation within populations is consistent with that of a pathogen that is at a high risk of adapting to repeated fungicide applications. While the Illinois population was mostly clonal, the genetic structure of the AG-2-2IIIB populations from Ontario and Ohio revealed a mixed reproductive mode, suggesting the need for caution when applying fungicides. Our results also presented genotype flow as a predominant force shaping the population genetic structure of this AG. To determine if R. solani populations are becoming less sensitive to the fungicide classes commonly used to manage seedling disease, a fungicide resistance monitoring program was initiated to compare the sensitivities of historical isolates with no prior fungicide exposure to the sensitivities of isolates that have been exposed to fungicides over time. Results from fungicide sensitivity assays showed that sensitivity to the fungicide classes tested has decreased in comparison to the baseline R. solani population, but control of seedling disease caused by R. solani was still achieved regardless of in vitro sensitivity.
The appendix chapter of this dissertation presents the results of a separate study evaluating the potential of a three-gene pyramid for improved soybean aphid management . From greenhouse studies evaluating the differential reaction of soybean isolines with different combinations of aphid resistance genes, Rag1, Rag2, and Rag3 to four soybean aphid biotypes, the Rag1/2/3 pyramid was found to be the most effective.Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2018-05-01The student, Olutoyosi Ajayi, accepted the attached license on 2016-04-15 at 13:35.The student, Olutoyosi Ajayi, submitted this Dissertation for approval on 2016-04-15 at 13:50.This Dissertation was approved for publication on 2016-04-20 at 15:05.DSpace SAF Submission Ingestion Package generated from Vireo submission #9247 on 2016-07-07 at 14:16:48Made available in DSpace on 2016-07-07T21:14:47Z (GMT). No. of bitstreams: 3
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The total synthesis of mycothiol and new inhibitors of carbohydrate processing enzymes
No full textThe work described in this dissertation covers a wide range of disciplines within organic chemistry, with the common goal of obtaining more information about various carbohydrate-processing enzymes. Carbohydrate-processing enzymes are garnering an increasing amount of attention relative to their more well-studied protein-processing counterparts, as they are ubiquitous and implicated in various regulatory, signaling and metabolic processes in eukaryotic cells. Chapter 1 involves the synthesis of anomeric phosphothioates as possible O-GlcNAc transferase inhibitors, and a mechanistic study on the anomeric Pudovik rearrangement of thiophosphites to thiophosphonates is described. Chapter 2 is an account of the development of a facile method for functionalizing 2-methyl thiazoline rings, and several selective GlcNAc-thiazoline-based O-GlcNAcase inhibitors were synthesized by this method. Chapter 3 details the 16-step total synthesis of the M. tuberculosis antioxidant carbohydrate mycothiol by a new intramolecular glycosylation method. The method is amenable to glycosylations of 2-deoxy-2-aminoglyosides, a unique aspect among such reactions. The efficiency of the synthetic route to mycothiol makes it attractive as a template from which to design analogs as potential inhibitors of enzymes involved in the biosynthesis of mycothiol. An apparently unprecedented 1,9-hydride shift is also described in the third chapter. Chapter 4 describes a tripartate prolonged-release drug delivery system, in which the drug of interest (ethynyl estradiol in this study) is coupled, through a variable linker, to another carrier drug with a long half-life and a relatively high inhibitory concentration. The effect of steric bulk on the in vitro release of ethynyl estradiol was evaluated, showing a direct relationship between steric bulk around the ester linkage and ethynyl estradiol release time. In vivo data from pigs also seemed to point to an increase in drug bioavailability with the 3-part system. Finally, chapter 5 describes early efforts to synthesize boronic acid analogs of folic acid and antifolates.Ph.D.Includes abstractVitaIncludes bibliographical referencesby Kehinde Ajay
Emerging Technologies involvement in E-learning: An expository using Progressive Web Application
No full textAbstract: School Management System using Progressive Web Application is aimed at Network Independent for Student Management system which allows the students to check through their details awithout necessary using data logging-in via their matriculation number, since the developed System will not allow matriculation numbers outside Lead City University. The main goal of this thesis is to develop a Progressive Web Application School Management System and provide an interface that will be used for all the necessary details of School Management. The objectives in achieving the set goal are: Designing of the database, designing of the design of the progressive web application school management system and the development of the whole system with HTML, CSS, PHP, JavaScript, React, Xamp Server. The system is targeted to helping students take their studies in a more advanced fashion breaking away from the conventional way of using papers and manual processing of doing their registration all the time. The School Management System using Progressive Web Application makes use of features such as service workers, push notification, indexedDB, Background sync is deployed for the implementation of the system. The system will give a more developed and user-friendly access as well as it will take less time to complete its execution. The cost of implementing the system is minimal compared to the cost of other development of other School Management System. The system is deployed into the Department of Computer Science in Lead City University.
Keywords: School Management System, Emerging Technologies, Progressive Web Application.
Title: Emerging Technologies involvement in E-learning: An expository using Progressive Web Application
Author: Emmanuel Adediran, Wumi Ajayi
International Journal of Recent Research in Mathematics Computer Science and Information Technology
ISSN 2350-1022
Vol. 9, Issue 2, October 2022 - March 2023
Page No: 18-23
Paper Publications
Website: www.paperpublications.org
Published Date: 15-December-2022
DOI: https://doi.org/10.5281/zenodo.7442150
Paper Download Link (Source)
https://www.paperpublications.org/upload/book/Emerging%20Technologies%20involvement-15122022-3.pdfInternational Journal of Recent Research in Mathematics Computer Science and Information Technology, ISSN 2350-1022, Paper Publications, Website: www.paperpublications.or
Teenage pregnancy: parental relationship of pregnant teenagers, 1994
Full text linkThe purpose of this study was to explore the significance of parental relationships and their impact on pregnant teenagers. To ascertain this purpose, the following areas on teenage pregnancy were addressed by the researcher: demographics, parental relationships, parents' attitudes toward teenage sexuality, and teenagers in the family constellation, health care utilization issues, and protective measures (contraceptives). A descriptive research design was used in this study. A self-administered descriptive questionnaire was given to teenagers in the clinical setting at South Side Health Care, Inc., in Atlanta, Georgia. A population of 40 pregnant teenagers participated in this study. The results of the findings demonstrate the need to improve the parental relationships of pregnant teenagers. This study will provide social workers with a better understanding of these relationships
Ultrastructural localization of alkaline phosphatase activity in and the histochemistry of eggs of Hydatigera taeniaeformis, 1979
Full text linkHistochemical methods were employed to study the chemical composition and transmission electron microscopy (TEM) was used in the study of the ultrastructural localization of alkaline phosphatase activity in eggs of Hydatigera taeniaeformis. The histochemical methods employed were the mercuric bromphenol blue (HgBPB) and diazosulfanilic acid azure-A (DAS-AZA) technique for pro�teins, the performic acid Schiff (PFAS) and the azure-A eosin B (AZA-EB) methods for keratin, the malachite green (MG) and methyl green pyronin (MeGP) techniques for sclerotin, and the periodic acid Schiff (PAS) tech-nique for carbohydrates and mucopolysaccharides. Further tests for muco�polysaccharides included the Alcian and To!uidine blue methods. The tests for protein indicated a protein composition in all layers of the eggs al�though the staining intensities varied. A positive reaction for keratin was observed in the embryophore and hooks. The hooks were also positive for sclerotin. The PAS method after diastase digestion was negative in the outer embryophoric membrane indicating the presence of glycogen, while the oncosphere remained positive to PAS following this digestion indicating a mucopolysaccharide composition. Positive reactions to Alcian and Toluidine blue tests further indicated the presence of mucopolysaccharides. The ultrastructural studies of alkaline phosphatase activity in these eggs revealed extensive localization of this enxyme in the embryophoric blocks with moderate localization in the outer embryophoric and the oncospheral membranes of the eggs. Inclusion of 1 mM sodium fluoride (NaF) in the incubation media inhibited this activity. It is suggested that this enzyme may probably be involved in absorption and transportation of nutrients from the surrounding uterine cells to the developing oncosphere
Application of automotive alternators in small wind turbines
No full textSmall wind turbines have been in existence for several years but it seems they are not used where they are needed the most-distant off grid communities in developing countries. Cost and maintenance have been attributed to be reasons for this. One of its expensive constituents is its generator. The automotive alternator is considered as an alternative for generators in small wind turbines. In this project work, an off-the-shelf recycled automotive alternator is experimentally parameterized and modeled with an assumed small wind turbine. The wind turbine’s characteristics have been designed to match the power requirements of the alternator. The dynamic response of the alternator to wind speed variations is modeled and the effect of turbine blades’ inertia on the generator speed and by extension on the wind turbine’s performance coefficient indicates the need for a speed control mechanism to attain turbine optimal power operation. The speed control serves the purpose of tracking the turbine’s maximum power characteristics. Other requirements for adaptation of the alternator are investigated and discussed in this thesis.Electrical power processingElectrical Power EngineeringElectrical Engineering, Mathematics and Computer Scienc
Pregnancy-risk perception and emergency contraception among female students in Southwest Nigeria
No full textMULTIPLE-ACCESS TECHNOLOGY OF CHOICE IN 3GPP LTE
No full textThird-Generation Partnership Project (3GPP) standardizes an Evolved UMTS Terrestrial Radio Access Network (EUTRAN)as air interface in its release 8 LTE. Orthogonal Frequency Division Multiple Access(OFDMA) and Single Carrier-Frequency Division Multiple Access(SC-FDMA)are key technologies for the air interface of mobile broadband systems.It is evident that mobile broadband access technologies are reaching a commonality in the air interface and networking architecture; they are being converged to an IP-based network architecture with OFDMA based air interface technology. The air interface of E-UTRAN is based on OFDMA in downlink and SC-FDMA in the uplink, making it possible to efficientl utilize bandwidth due to the orthogonally between sub-carriers and by assigning subsets of sub-carriers to individual users which allows for simultaneous data rate transmission from several users and differentiated quality of service for each user. In this paper, wehighlight the technologies behindOFDMA and SC-FDMA and also carry out performance comparison of the two air interface technologies. We brieflydescribe the 3GPP LTE standard, and its implementation using OFDMA and SC-FDMA technology.</jats:p
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