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11 record(s) found

Two New isoquinoline alkaloids from the bark of Alphonsea cylindrica King and their antioxidant activity

Abstract

Two new isoquinoline alkaloids, iraqiine (1) and kareemine (2), along with five known alkaloids, muniranine (3), kinabaline (4), O-methylmoschatoline (5), atherospermidine (6) and N-methylouregidione (7), were purified from the dichloromethane crude extract of Alphonsea cylindrica bark. The structures of these compounds were elucidated through extensive 1D and 2D NMR, IR and LC–MS studies and comparison with previously reported data. Compounds (1–5 and 7) were tested for their antioxidant activity using in vitro DPPH radical scavenging assay, and 1, 3 and 4 showed the highest antioxidant activities with IC50 values of 48.77 ± 1.01, 44.51 ± 1.12 and 64.28 ± 0.93 μg/ml, respectively ..

Article Published 2019 5281 hits Limited

Leadership, career growth and socialization paths of Malaysian public school managers

Wai Bing Khuan, Abdull Kareem Omar,

Abstract

The main purpose of this study was to understand the nature of learning for school managers in government schools as they learn and make decisions at different stages of the socialization stages from accession to retirement. A phenomenological approach was utilized and participants were selected from excellent and successful school managers through elite sampling. The data collection methods employed to achieve the purpose of the study were mainly in-depth interviews with the participants. The thematic findings which emerged from this data included four socialization stages namely: (1) Entry into Headship; (2) Identity Formation; (3) Making a Difference; and (4) Reformulation of Personal Values. The study concluded that the findings of this study provided a helpful guide for understanding school managers’ learning in the socialization process towards achieving better leadership and decision making. Implications for relevant training and appropriate support for leadership preparation .....

Article Published 2014 1777 hits Available

Measuring teacher attitudes toward change : an empirical validation

Kin Tai Mei, Abdull Kareem Omar,

Article Published 2017 1531 hits Available

Principal change leadership competencies and teacher attitudes toward change : the mediating effects of teacher change beliefs

Kin Tai Mei, Kareem Omar Abdull, Nordin Mohamad Sahari, Bing Khuan Wai,

Article Published 2017 2921 hits Limited

Measurement is a monetary criterion in the Arabic grammar with Dr. Saeed Al-Zubaidi

Kareem,Amina Badie

Abstract

The research is studied for the first time which called measurement benchmark Liberate in nahuw Arabic at Alzubaidf, and the extent rights, and pronunciation that he used Grammarians in that acceptance and response, The search included: Two sections, a prelude, and an epilogue. And the first part, entitled: Acceptance axis, The second topic is entitled: Res ponce axis, The search is over the conclusion which summarized the key findings of the research. Keyword: Measurement, Critical Criterion, Arabic Grammar, Hearing..

Article Published 2022 413 hits Available

An exploration of the relationship between teacher change beliefs and teacher attitudes toward change

Kin Tai Mei, Kareem Omar Abdull,

Article Published 2017 1752 hits Limited

Emotional intelligence of school principals in managing change: Malaysian perspective

Omar Abdull Kareem

Abstract

The increasing demands for accountability and school reform continuously challenge the roles of school leaders. Today, school leadership is no longer task driven per se, but emotionally compelling as emotions and change are interlinked at the micro-level of organisational behaviours. The purposes of the study were to examine the levels of Principal Change Leadership Emotional Intelligence (PCLEI) in Malaysian secondary schools and the demographic determinants of PCLEI. Analysis of the survey was performed based on the data of 743 school principals, 2021 senior assistants and 2707 teachers. The findings revealed that, (a) school principals were rated as Excellent in PCLEI; (b) in terms of dimensions, school principals were reported Excellent in Emotional Regulation and Emotional Utilisation, and Good in Emotional Perceiving and Expressing and Emotional Understanding; and (c) PCLEI was reliably related to gender, race, age and seniority but not academic qualification...

Article Published 2019 1729 hits Available

Professional learning communities in Peninsular Malaysia: Comparing day secondary school and national religious secondary school

Omar Abdull Kareem

Abstract

The main aim of the study was to examine and compare the implementation of professional learning communities (PLCs) in Day Secondary School (DSS) and National Religious Secondary School (NRSS) in Peninsular Malaysia. A total of 350 teachers from DSS and 371 from NRSS completed the survey with usable data. The results revealed that, i) both DSS and NRSS achieved the level of Quite Good in PLCs, its dimensions as well as its sub-dimensions; ii) NRSS achieved a higher mean score than DSS in PLCs, Organizational Factor as well as Non-organizational Factor and the differences were significant; iii) both DSS and NRSS achieved a higher mean score in Organization Factor than Non-Organizational Factor; iv) among all the sub-dimensions of PLCs, both DSS and NRSS achieved the highest mean score in Shared Norms and Vision; v) among all the sub-dimensions of PLCs, DSS achieved the lowest mean score in External Support System whereas NRSS achieved the lowest mean score in Structural Support. This st.....

Article Published 2019 1841 hits Limited

Secondary metabolites from three species of annonaceae plants and their biological activities

Obaid, Ahmed Kareem

Abstract

The study aimed to investigate the chemical constituents from Polyalthia lateriflora, Alphonsea elliptica and Alphonsea cylindrica as well as their cytotoxic, antioxidant and xanthine oxidase inhibitory activities. These samples were collected from Peninsular Malaysia and then extracted sequentially using hexane, dichloromethane and methanol. The chemical compounds were isolated and purified by various chromatographic techniques and their structures were elucidated via spectroscopic method especially Nuclear Magnetic Resonance, Mass Spectrometry, Infrared, Ultraviolet and comparison with literature. Cytotoxic activity was analysed on MCF-7 human breast cancer cells while antioxidant activity was measured using 2,2-diphenyl-1-picrylhydrazyl (DPPH). Study on P. lateriflora has yielded six compounds which were lupeol, stigmasterol, Omethylmoschotaline, atherospermidine, lysicamine and liriodenine. Meanwhile, five compounds namely kinabaline, atherospermidine, liriodenine, N-met.....

Thesis Published 2019 3183 hits Available

The relationship between learning-centred leadership and professional learning community: Evidence from Malaysia

Omar, Emeritus Abdull Kareem

Abstract

The objective of the study was to investigate the relationship between Learning-Centred Leadership (LCL) and Professional Learning Community (PLC) in Malaysian secondary schools. By employing disproportionate stratified sampling, a total of 811 schoolteachers completed the survey. The results revealed that: i) the relationship between LCL and PLC is significant and positive; ii) the correlation between LCL and PLC is strong whereby LCL contributed 54.8% the total variation of PLC; iii) Builds a Learning Vision, Provides Learning Support, Manages the Learning Programme and Modelling are predictors of LCL and iv) Manages the Learning Programme contributed the most to PLC, followed by Modelling, Builds a Learning Vision and Provides Learning Support. The study uncovers the fact that LCL is a good predictor of PLC. It offers local and international practitioners another dimension about educational leadership that LCL is an effective leadership style that can gauge improvement in enhancing .....

Article Published 2024 531 hits Available

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