Tree species for urban parks and roadside based on carbon storage, sequestration and maintenance in Iskandar Malaysia

Urbanisation triggers high carbon emission and exacerbates global warming. Trees play a significant role to tackle these problems as they provide vital ecosystem services including carbon storage and sequestration. However, trees vary in their ability to provide these services and there is little information on how actual carbon storage and sequestration by trees could be estimated particularly in the tropical region. Furthermore, trees with low endurance rate and unhealthy ones can be harmful to properties and human lives as well as overhanging branches can obscure streetlights, signs and traffic signals and affect road users’ vision in the vicinity. These situations contribute to the cumulative maintenance burden to the local authority. This research aims to select types of urban tree species suitable for urban parks and roadsides based on their capacity to store and sequester carbon, and ease of maintenance in Iskandar Malaysia. Field data of 2,245 urban trees were collected from two local authorities, namely Johor Bahru City Council and Pasir Gudang Municipal Council. Allometric equations were used to estimate carbon storage and sequestration. The findings showed that Pterocarpus indicus, Alstonia angustifolia, Syzygium grande, Pongamia pinnata and Hopea odorata stored (2,019, 1,531, 615, 321 and 244 kg tree-1, respectively) and sequestered (78, 61, 30, 17 and 13 kg tree-1 year-1, respectively) the highest carbon in comparison to other species. In addition, a questionnaire survey was also conducted to gain detailed information about tree maintenance from professionals including urban planners, landscape architects and certified arborists. Results showed that Pongamia pinnata had the highest score of 94, followed by Syzygium grande (91), Alstonia angustifolia (90), Hopea odorata (90) and Pterocarpus indicus (83). Hence, these are the most suitable tree species to be planted at urban parks and roadsides because of their high capacity to store and sequester carbon and their low maintenance as shown by the local authorities. This study has shown ways to assess the actual role of urban trees in reducing carbon and mitigate climate change as well as reduce the burden of maintenance for local authorities and decision makers. The implication would be better management plans for urban forestry in Malaysia for the future

Model selection and model averaging on mortality of upper gastrointestinal bleed patients

Model Selection (MS) is known to produce uncertainty into model-building process. Besides that, the process of MS is complex and time consuming. Therefore, Model Averaging (MA) had been proposed as an alternative to overcome the issues. This research will provide guidelines of obtaining best model by using two modelling approach which are Model Selection (MS) and Model Averaging (MA) and compares the performance of both methods. Corrected Akaike Information Criteria (AICc) and Bayesian Information Criteria (BIC) were applied in the model-building using MS to help determine the best model. In MA process, model selection criteria are needed to compute the weights of each possible models. Two model selection criteria (AICcand BIC) were compared to observe which will produce model with a better performance. For guidelines illustration, data of Upper Gastrointestinal Bleed (UGIB) were explored to identify influential factors which leads to the mortality of patients. At the end of the study, best model using MA shown to have a better performance andAICc is proven to be a better model selection criterion approach in MA. In conclusion, the most significant factors for mortality of UGIB patients were identified to be shock score, comorbidity and rebleed

Identification of suitable trees for urban parks and roadsides in Iskandar Malaysia

Urban trees provide a number of benefits, mainly for environment, community, and economy, but can also be harmful to property and human lives. Urban trees planted at roadsides with low endurance rate and unhealthiness increase the risk of tree fracture and fall which is hazardous to motorists and pedestrians. Overhanging limbs, on the other hand, can obscure streetlights, signs and traffic signals and affect road users’ vision in vicinity. These situations contribute to the cumulative maintenance burden to the local authority. This makes the study of maintenance level and suitable location for urban tree planting important. An appropriate maintenance and location can be suggested for assuring a healthy, safe, resilient and long-term survival of urban trees. Urban tree field data from two local authorities in Iskandar Malaysia region (located in the southern part of Peninsular Malaysia), Johor Bahru City Council, and Pasir Gudang Municipal Council, were obtained to achieve the objective of this study. Survey based on questionnaire was conducted to gain detailed information about the maintenance level of existing trees and their suitable locations in the cities from the professionals including urban planners, landscape architects, and certified arborists. By applying a simple scoring method to the data obtained from professionals, suitable locations for existing trees in the two cities were determined. The scores range between 0 and 300 and the highest value means less maintenance is required by the trees. Results show that Mimosup elengi tree species (Sapotaceae family) has the highest score of 300 followed by Cinnamomum verum (297) and Hopea odorata (283). Khaya senegalensis, on the other hand, with 245 score value was found to require high levels of maintenance. The results also indicate that maintenance level and suitable location for planting vary and depending on the features of the tree species. Strongest trees or limbs tend to cause less problems thus require less maintenance. Trees found in the nature (forest) including Mimosup elengi and Cinnamomum verum are usually more resilient and can tolerate a wide range of conditions and locations. This study can help reducing the risk of tree fracture and fall, prolong the life of trees, and reduce the burden of maintenance for local authorities and decision makers by providing insights to the maintenance level and suitable locations for planting and to make better management plans for urban forestry in Malaysia in the future

Synergistic effect of probe sonication and ionic liquid for extraction of phenolic acids from oak galls

Phenolic acids of oak gall were extracted using ultrasonic-probe assisted extraction (UPAE) method in the presence of ionic liquid. It was compared with classical ultrasonic-bath assisted extraction (CUBAE) and conventional aqueous extraction (CAE) method, with and without the presence of ionic liquid. Remarkably, the UPAE method yielded two-fold higher extraction yield with the presence of ionic liquid, resulting 481.04 mg/g for gallic acids (GA) and 2287.90 mg/g for tannic acids (TA), while a decreased value of 130.36 mg/g for GA and 1556.26 mg/g for TA were resulted with the absence of ionic liquid. Intensification process resulted the highest yield of 497.34 mg/g and 2430.48 mg/g for GA and TA, respectively, extracted at temperature 50 °C with sonication intensity of 8.66 W/cm2 and 10% duty cycle, diluted in ionic liquid, 1-Butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide, [Bmim][Tf2N] at concentration of 0.10 M with sample-to-solvent ratio 1:10 for 8 h. Peleg’s model successfully predicted the UPAE process confirming that extraction capacity is the controlling factor in extracting phenolic acids. Hence, it can be concluded that UPAE method and ionic liquid have synergistic effect as it effectively enhanced the extraction efficiency to increase the bioactive constituents yield

Validation of the Malay version of the snyder hope scale among Malaysian cancer patients

Hope leads to lower depression and anxiety and is associated with improved quality of life of cancer patients. In this study, Hope Scale (HS) was translated into Malay, and the psychometric properties of the Malay version of the Hope Scale were investigated among Malaysian cancer patients. Concurrent translation and back translation of the original English version of the Hope Scale were performed, and the Malay version was administered to 195 cancer patients with different cancer diagnoses at baseline assessment and 2 months later at follow-up. The Hope Scale (Malay) total score (Cronbach’s α = 0.72; intraclass correlation coefficient (ICC) = 0.67) and its domains (Cronbach’s α [pathway] = 0.7; Cronbach’s α [agency] = 0.7; ICC[Pathway] = 0.64; ICC[Agency] = 0.70) demonstrated acceptable internal consistencies and test-retest reliability. Convergent and discriminant validities were also achieved by the Hope Scale (Malay). The Hope Scale (Malay) demonstrated construct validity, as confirmatory factor analysis demonstrated that the items in the Hope Scale (Malay) best fit into two domains, which was true for the original English version. The Hope Scale (Malay) had acceptable psychometric properties and thus is suitable for assessing hope in Malaysian cancer patients

Validation of the Malay Version of the Sources of Social Support Scale among Malaysian Cancer Patients

Objective: It is important to investigate the association between spousal support and psychology of cancer patients, thus a validated instrument to measure the degree of perceived spousal support is required. We translated and evaluated the psychometric properties of the Sources of Social Support Scale-Malay version (SSSS-Malay) among Malaysian cancer patients. Methods: In this study, the SSSS-Malay and Hope Scale-Malay [used to compare with the SSSS-Malay to assess discriminant validity] were administered to 195 Malaysian cancer patients during baseline assessment. The SSSS-Malay was re-administered 2 months after the baseline assessment during follow-up. Results: The SSSS-Malay total score (Cronbach’s α = 0.70, intraclass correlation coefficient (ICC) = 0.72) and its domains (Cronbach’s α ranging from 0.70 to 0.83, intraclass correlation coefficient ranging from 0.6 to 0.76) exhibited good internal consistencies and good test-retest reliability. The SSSS-Malay also demonstrated good convergent and discriminant validities. However, confirmatory factor analysis of the SSSSMalay showed that it was best fit into a 3-factor model instead of the 4-factor model of the original English version. Conclusion: The SSSS-Malay demonstrated good psychometric properties for use in Malaysian cancer patients

Evaluation of La-Doped CaO Derived from Cockle Shells for Photodegradation of POME

Photocatalysis has merged to be one of the most promising technology in wastewater remediation. However, the application of photocatalysis in treating palm oil mill effluent (POME) is still limited. Many researches were conducted to explore simple and cost-effective alternatives to replace TiO2 for various industrial purposes. Therefore, the aim of this study is to synthesize and characterize lanthanum doped calcium oxide (La/CaO) as photocatalyst as well as to evaluate the performance of these photocatalysts in the degradation of POME. The photocatalyst used in this study was converted from cockle shells to transform into calcium oxide (CaO) through calcination process. The CaO produced was doped with 1 wt%, 3 wt%, and 5 wt% of lanthanum (La) using wet impregnation method to enhance its photocatalytic activity. The photocatalysts were characterised using X-ray Diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR), Brunauer-Emmett-Teller (BET), Scanning Electron Microscopy (SEM), Energy-Dispersion X-ray (EDX) and Inductively Coupled Plasma Mass Spectrometry (ICPMS). Then, this photocatalyst was performed on POME under UVC in a batch system by using different La/CaO at optimum catalyst dosage of 3.0 g/L. Through this research, it was found that the POME degradation through photocatalytic reaction was increased with the incorporation of La where 3 wt% La/CaO shows the highest POME degradation compared to others. This is due to the larger BET surface area that provides more active sites resulted from the incorporation of La. The findings of this study imply that the contaminants in POME can be reduced by utilizing CaO derived from cockle shells. Copyright © 2019 BCREC Group. All rights reserve

VALIDATION OF THE MALAY VERSION OF THE EXPLANATORY MODEL INTERVIEW CATALOGUE STIGMA SCALE AMONG COVID-19 SURVIVORS IN MALAYSIA

Abstract The Coronavirus disease (COVID-19) imparted unprecedented negative impact worldwide since it was declared as a global pandemic in 2020 due to its high infectivity and mortality rate. Consequently, those who have been infected with COVID-19 experienced significant amount of social stigma which resulting in deterioration of mental well being. Hence, this study aimed to translate the Explanatory Model Interview Catalogue Stigma Scale (EMIC-SS) into Malay and investigate the reliability and validity of the Malay version (EMIC-SS-M) among COVID-19 survivors in Malaysia. Initially, concurrent translation and back translation of the EMIC-SS was conducted followed by the assessment of its face and content validity. Then, the EMIC-SS-M was administered to 219 COVID-19 survivors recruited from three targeted centers for assessment of its reliability (internal consistency) and validity (convergent and discriminant validity, exploratory factor analysis [EFA] and confirmatory factor analysis [CFA]). The EMIC-SS-M reported an acceptable internal consistency with Cronbach’s α of 0.727, while its domains reported acceptable Cronbach’s α ranged from 0.708 to 0.795. EFA and CFA confirmed that the EMIC-SS-M consisted of 15 items in 4 domains. The EMIC-SS-M exhibited good psychometric properties and ready for use to assess stigma among COVID 19 survivors in Malaysia. It can be adapted for use to assess stigma in other disease conditions among the Malaysian population in future studies