Effects of dexamethasone on progesterone and estrogen profiles and uterine progesterone receptor localization during pregnancy in Sahel goat in Semi-Arid region

( Dauda Yahi ),( Nicholas Adetayo Ojo ),( Gideon Dauda Mshelia ) 한국동물자원과학회 2017 한국축산학회지 Vol.59 No.5

Background: Despite the widespread use of dexamethasone in veterinary and human medicine, it is reported to cause some severe pregnancy related side effects like abortion in some animals. The mechanism of the response is not clear but seems to be related to interspecies and/or breed difference in response which may involve alterations in the concentrations of some reproductive hormones. Methods: Twenty Sahel goats comprising 18 does and 2 bucks were used for this study. Pregnancies were achieved by natural mating after synchronization. Repeated dexamethasone injections were given at 0.25 mg/kg body weight. Blood samples were collected biweekly for hormonal assay. Uterine biopsies were harvested at days 28 and day 78 of gestation through caesarean section for immunohistochemical analysis using 3 pregnant does randomly selected from each group at each instant. Data were expressed as Means ± Standard Deviations and analyzed using statistical soft ware package, GraphPad Instant, version 3.0 (2003) and progesterone receptor (PR) were scored semi-quantitatively. Results: Dexamethasone treatments had no significant (p > 0.05) effect on progesterone and estrogen concentrations in pregnant Sahel goats but up regulated PR from 2+ to 3+ in second trimester. Conclusion: As dexamethasone adverse effect on placenta is an established fact, the lack of effect on progesterone level in this study may be due to the fact that unlike other species whose progesterone production during pregnancy is placenta - dependent, in goats is corpus luteum - dependent. Consequently dexamethasone adverse effect on placenta reported in literatures did not influence progesterone levels during pregnancy in Sahel goat. The up regulation of progesterone receptor (PR) in Sahel goat gravid uterus is a beneficial effects and that dexamethasone can safely be used in corpus luteum - dependent progesterone secreting pregnant animal species like Sahel goat and camel. Therefore source of progesterone secretions during pregnancy should be considered in clinical application of dexamethasone in pregnancy.

Processing and mechanical property evaluation of maize fiber reinforced green composites

Dauda, Mohammed,Yoshiba, Masayuki,Miura, Kazuhiro,Takahashi, Satoru The Korean Society for Composite Materials 2007 Advanced composite materials Vol.16 No.4

Green composites composed of long maize fibers and poly $\varepsilon$-caprolactone (PCL) biodegradable polyester matrix were manufactured by the thermo-mechanical processing termed as 'Sequential Molding and Forming Process' that was developed previously by the authors' research group. A variety of processing parameters such as fiber area fraction, molding temperature and forming pressure were systematically controlled and their influence on the tensile properties was investigated. It was revealed that both tensile strength and elastic modulus of the composites increase steadily depending on the increase in fiber area fraction, suggesting a general conformity to the rule of mixtures (ROM), particularly up to 55% fiber area fraction. The improvement in tensile properties was found to be closely related to the good interfacial adhesion between the fiber and polymer matrix, and was observed to be more pronounced under the optimum processing condition of $130^{\circ}C$ molding temperature and 10 MPa forming pressure. However, processing out of the optimum condition results in a deterioration in properties, mostly fiber and/or matrix degradation together with their interfacial defect as a consequence of the thermal or mechanical damages. On the basis of microstructural observation, the cause of strength degradation and its countermeasure to provide a feasible composite design are discussed in relation to the optimized process conditions.

The Utilization of e-resources at Modibbo Adama University of Technology (MAUTech), Yola, Adamawa State, Nigeria

Dauda Joshua,Lizette King 건국대학교 지식콘텐츠연구소 2020 International Journal of Knowledge Content Develop Vol.10 No.1

Antecedents to teachers’ perceptions of the usefulness of ICTs for business education classroom instructions in Nigerian tertiary institutions

Isiyaku Dauda Dansarki,Ayub Mohd Ahmad Fauzi,AbdulKadir Suhaida 서울대학교 교육연구소 2018 Asia Pacific Education Review Vol.19 No.3

This study investigated the antecedents to Nigerian business education teachers’ perceptions of the usefulness of technology in the classroom. Theoretical support for the study was based on the work of Venkatesh and Bala’s (Decis Sci 39(2):273–315, 2008) Technology Acceptance Model III where computer self-efficacy and perceived enjoyment were identified as antecedents to perceived ease of use of technology while subjective norm was identified as an antecedent to perceived usefulness. The study proposed a structural model to investigate whether computer self-efficacy, perceived enjoyment, and subjective norm were antecedents to teachers’ perceived usefulness of ICTs in Business Education classrooms of Nigerian tertiary institutions. The study was a survey research involving 212 teachers sampled from the Business Education faculties of 13 tertiary colleges in Northwestern Nigeria, sub-Sahara Africa. The research instrument for data collection was a structured questionnaire using items adapted from previously validated studies. The questionnaire yielded high-reliability coefficients both at the pilot and actual study stages. SPSS version 22 was used for descriptive statistics analyses, and AMOS 22 was used for structural equation modeling. The study model explained about 33% of the variance in teachers’ perceptions of the usefulness of ICTs in the classroom. Two of the hypotheses of the study were statistically significant. Teachers’ computer self-efficacy and perceived enjoyment of ICTs were found to significantly influence their perceived usefulness of ICTs. The study recommends that Nigerian teachers should be trained to integrate ICTs in the curriculum and be provided with ICT support services in order to help them with ICT difficulties in the classroom.

Efficacy of Carcass Electrical Stimulation in Meat Quality Enhancement: A Review

Adeyemi, Kazeem Dauda,Sazili, Awis Qurni Asian Australasian Association of Animal Productio 2014 Animal Bioscience Vol.27 No.3

The use of electrical stimulation (ES) as a management tool to improve meat quality and efficiency of meat processing is reviewed. The basis of the efficacy of ES is its ability to fast track postmortem glycolysis, which in turn stimulates myriad histological, physical, biochemical, biophysical and physiological changes in the postmortem muscle. Electrical stimulation hastens the onset and resolution of rigor mortis thereby reducing processing time and labor and plays a vital role in improving meat tenderness and other meat quality traits. However, ES may have negative impacts on some meat quality traits such as color stability and water holding capacity in some animals. Electrical stimulation is not an end in itself. In order to achieve the desired benefits from its application, the technique must be properly used in conjunction with various intricate antemortem, perimortem and postmortem management practices. Despite extensive research on ES, the fundamental mechanisms and the appropriate commercial applications remained obscured. In addition, muscles differ in their response to ES. Thus, elementary knowledge of the various alterations with respect to muscle type is needed in order to optimize the effectiveness of ES in the improvement of meat quality.

COMPARATIVE EVALUATION OF PALM KERNEL SHELL AND POLYPROPYLENE AS BIOFILTER MEDIA FOR DENITRIFICATION OF AQUACULTURE WASTEWATER

Akeem B. Dauda,Ayoola O. Akinwole 한국수산과학회 양식분과 2015 한국수산과학회 양식분과 학술대회 Vol.2015 No.5

Birds' species diversity measurement of Uchali Wetland (Ramsar site) Pakistan

Taofik Oyedele Dauda,Md. Hafiz Baksh,Anuar Mohd. Sah Shahrul 국립중앙과학관 2017 Journal of Asia-Pacific Biodiversity Vol.10 No.2

We carried out this study to evaluate bird species diversity and to model bird species abundance using Uchali Wetland, Pakistan (32°33′N, 72°01′E). Data obtained were subjected to summary statistics, Simpson diversity, Shannon evenness index, and rank abundance curve and model. The watershed supports 25,361 birds of 47 species, which is appreciably less than the number of bird species supported by the same wetland in the past year (1991). Total evenness could be obtained as the ranks increases and this differed annually. Evenness index (EI) analysis showed that EI for 2011 was 0.0231, for 2012, it was 0.02, for 2013, it was 0.01, and for the annual mean, it was 0.046 indicating functional abundance of the species. Bird species diversity measurement could be enhanced by the use of the modified rank–abundance curve and would clearly present the true picture of the bird species abundance.

Awareness and Utilization of the Internet Resources and Services for Academic Activities by the Academics of Tertiary Institutions in Adamawa State, Nigeria

Idris Suleiman,Dauda Joshua 건국대학교 지식콘텐츠연구소 2019 International Journal of Knowledge Content Develop Vol.9 No.2

Profile and Outcome of Management of Brain Tumours in Kaduna Northwestern Nigeria

Sale Danjuma,Happy Amos Dauda,Aghadi Ifeanyi Kene,Kache Stephen Akau,Ismail Nasiru Jinjiri 대한신경외과학회 2022 Journal of Korean neurosurgical society Vol.65 No.5

Objective : Tumours of the brain are a rare occurrence accounting for approximately 2% of all neoplasms in adults. Few studies have been done in Nigeria on the profile of brain tumours. The aim of this study is to determine the profile of brain tumours in general and determine the change in Kanofsky Performance Score (KPS) after treatment. Methods : This is a prospective hospital-based study in Kaduna. All consecutive patients over 18 years of age with diagnosis of brain tumours from January 2016 to December 2019 were included in the study. Demographic and clinical data was collected using a proforma during the study. Patients who received treatment were followed up for 12 months. The primary outcome data was the difference in the quality of life as measured by KPS at the point of first contact and at 1-month after treatment and at 12-month follow up. Data obtained was analysed with SPSS version 25.0 for Windows. Descriptive statistics was done to determine the profile. Paired t-test at 95% confidence interval was done to check for significant correlation between the mean KPS. Results : A total of 39 consecutive patients were included in the study. There was a slight male preponderance with a M : F of 1.17 : 1. Meningioma and metastasis were more common in females while gliomas and pituitary tumours were more common in males. The mean age of patients was 49.8 years and standard deviation of 11.8 years. Pituitary tumours were the most common tumours. The most common location of the tumour was frontal lobe followed by the pituitary gland. The mean duration of symptoms before neurosurgical consultation was 38 weeks. The most common presenting symptoms of patient with brain tumour was headache. The quality of life improve compare to the baseline in 81% of patient at discharge and at 1 year follow up. The overall mortality rate was 25.6%. Conclusion : The most common brain tumour in our study is pituitary tumour. Most patients present late. The most common presenting symptoms is headache. There is significant improvement in the KPS of patients following treatment. The overall mortality rate at 1-year post treatment is 25.6%.

Synthesis of highly efficient asphalt-based carbon for adsorption of polycyclic aromatic hydrocarbons and diesel from emulsified aqueous phase

Alissa Faisal M.,Mohammed Dauda,Osman Abdalghaffar M.,Basheer Chanbasha,Siddiqui Mohammad Nahid,Al-Arfaj Abdurrahman A.,Suliman Munzir H. 한국탄소학회 2020 Carbon Letters Vol.30 No.5

This work reports the syntheses of an inexpensive and efcient asphalt-derived mesoporous carbon (AdMC) as an adsorbent. The adsorbent was activated with potassium hydroxide to increase its surface area and then characterized by SEM–EDS, FT-IR, and BET. The adsorption properties of AdMC were evaluated for the adsorptive removal of eleven Poly Aromatic Hydrocarbons (PAHs) and diesel from water samples. The prepared AdMC showed very high surface areas and high micropore volumes equal to 2316 m2 /g and 1.2 cm3 /g, respectively. Various experimental conditions infuencing the adsorp�tion capacity of eleven PAHs and diesel were investigated. At high concentrations, PAHs and diesel solubility in water is very low. Hence, samples were emulsifed with a surfactant, and then maximum adsorption capacity was investigated. Adsorption profle of individual PAHs was examined using gas chromatography/mass spectrometry analysis followed by liquid–liquid extraction. Total hydrocarbon removal was studied using a total organic analyzer. Asphalt-derived mesoporous sorbent showed an extreme ability to remove PAHs and diesel (average adsorption capacity of 166 mg/g for individual PAHs and diesel (maximum capacity of 1600 mg/g). The experimental results ftted the Langmuir model with a correlation efciency of 0.9853. The results obtained for both adsorbents also matched to pseudo-second-order kinetics, suggesting that the adsorp�tion of PAHs and diesel is chemical, monolayer, and homogeneous process.