Displaying publications 1 - 20 of 411 in total

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  1. Topakian R, King A, Kwon SU, Schaafsma A, Shipley M, Markus HS, et al.
    Neurology, 2011 Aug 23;77(8):751-8.
    PMID: 21849657 DOI: 10.1212/WNL.0b013e31822b00a6
    Better methods are required to identify patients with asymptomatic carotid stenosis (ACS) at risk of future stroke. Two potential markers of high risk are echolucent plaque morphology on carotid ultrasound and embolic signals (ES) in the ipsilateral middle cerebral artery on transcranial Doppler ultrasound (TCD). We explored the predictive value of a score based on these 2 measures in the prospective, observational, international multicenter Asymptomatic Carotid Emboli Study.
    Matched MeSH terms: Longitudinal Studies
  2. MacDonald MR, Tay WT, Teng TK, Anand I, Ling LH, Yap J, et al.
    J Am Heart Assoc, 2020 01 07;9(1):e012199.
    PMID: 31852421 DOI: 10.1161/JAHA.119.012199
    Background Data comparing outcomes in heart failure (HF) across Asia are limited. We examined regional variation in mortality among patients with HF enrolled in the ASIAN-HF (Asian Sudden Cardiac Death in Heart Failure) registry with separate analyses for those with reduced ejection fraction (EF; <40%) versus preserved EF (≥50%). Methods and Results The ASIAN-HF registry is a prospective longitudinal study. Participants with symptomatic HF were recruited from 46 secondary care centers in 3 Asian regions: South Asia (India), Southeast Asia (Thailand, Malaysia, Philippines, Indonesia, Singapore), and Northeast Asia (South Korea, Japan, Taiwan, Hong Kong, China). Overall, 6480 patients aged >18 years with symptomatic HF were recruited (mean age: 61.6±13.3 years; 27% women; 81% with HF and reduced rEF). The primary outcome was 1-year all-cause mortality. Striking regional variations in baseline characteristics and outcomes were observed. Regardless of HF type, Southeast Asians had the highest burden of comorbidities, particularly diabetes mellitus and chronic kidney disease, despite being younger than Northeast Asian participants. One-year, crude, all-cause mortality for the whole population was 9.6%, higher in patients with HF and reduced EF (10.6%) than in those with HF and preserved EF (5.4%). One-year, all-cause mortality was significantly higher in Southeast Asian patients (13.0%), compared with South Asian (7.5%) and Northeast Asian patients (7.4%; P<0.001). Well-known predictors of death accounted for only 44.2% of the variation in risk of mortality. Conclusions This first multinational prospective study shows that the outcomes in Asian patients with both HF and reduced or preserved EF are poor overall and worst in Southeast Asian patients. Region-specific risk factors and gaps in guideline-directed therapy should be addressed to potentially improve outcomes. Clinical Trial Registration URL: https://www.clinicaltrials.gov/. Unique identifier: NCT01633398.
    Matched MeSH terms: Longitudinal Studies
  3. Abdul Rahman MH, Sadi T, Ahmad AA, Masri IN, Mohammad Yusoff M, Kamaruddin H, et al.
    Heliyon, 2020 Jul;6(7):e04486.
    PMID: 32715140 DOI: 10.1016/j.heliyon.2020.e04486
    Composting of yard waste is one of the waste management approaches in the Malaysian Agricultural Research and Development Institute (MARDI) in Serdang, Selangor, Malaysia. The yard waste inventory was developed in the headquarters' area and a pilot-scale study was performed on the potential compost product. The total amount of yard waste generated from June 2017 to December 2017 was 16.75 tonnes with an average generation of 0.60 tonnes per week on the dry weight (d.w.) basis. The collected yard waste consisted of three major characteristics, namely dry leaves, fresh green leaves, and grass cuttings, and a waste estimation technique was applied to determine the composition of these three elements. The acquired information was used to formulate the initial compost mixture. The wastes were then mixed with an appropriate amount of livestock manure and other wastes to obtain the optimum initial C/N ratio, which was then found in the analysis to range between 25:1 and 42:1. Meanwhile, the C/N ratios obtained from the matured compost product were from 10:1 and 15:1. Moreover, most of the compost yield ranged between 50% and 70% (w w-1 d.w. basis), while the percentage of the seed germination in the compost was over 95%. The viability of the project was indicated from the economic analysis, with benefit to cost ratio (BCR) values of more than 1. The results also suggested that the large scale composting of yard waste in MARDI was feasible and its applicability is continuous. This technique also fulfilled the objective of producing quality compost, which was suitable for agricultural use.
    Matched MeSH terms: Longitudinal Studies
  4. Mamat R, Awang SA, Ab Rahman AF
    Drug Healthc Patient Saf, 2020;12:95-101.
    PMID: 32523381 DOI: 10.2147/DHPS.S249104
    Purpose: Assessment of medication errors (ME) is crucial to improving the quality of health care. A questionnaire that can be used to explore pharmacists' perspectives regarding ME would be very useful as part of an ongoing process of quality improvement in patient care. The aim of this study was to develop and validate a questionnaire to measure perceived causes of ME and attitude towards ME reporting among pharmacists.

    Methods: The questionnaire was developed from the literature together with outcomes from focus group discussions. It was divided into two domains which are knowledge on ME and attitude towards ME reporting. Content validity index (I-CVI), exploratory factor analysis (EFA), Cronbach alpha and intraclass correlation coefficient (ICC) to assess test-retest reliability were obtained during the validation process.

    Results: Overall Cronbach alpha for internal consistency was good (0.742), where subscale of the questionnaire demonstrated adequate internal consistency, with Cronbach alpha value 0.83 for knowledge and 0.70 for reporting behaviour attitude. The I-CVI showed good scores (knowledge=0.88) and (attitude=0.81), while ICC was moderately accepted with a value of 0.77. Two factors were extracted from the 16 items in EFA.

    Conclusion: The questionnaire to assess knowledge on ME and attitude towards ME reporting among pharmacists is valid and reliable. It demonstrates good psychometric properties.

    Matched MeSH terms: Longitudinal Studies
  5. Daud NA, Ab-Rahman A
    Neurosciences (Riyadh), 2012 Jul;17(3):269-70.
    PMID: 22772938
    Matched MeSH terms: Longitudinal Studies
  6. Mahat NA, Muktar NK, Ismail R, Abdul Razak FI, Abdul Wahab R, Abdul Keyon AS
    Environ Sci Pollut Res Int, 2018 Oct;25(30):30224-30235.
    PMID: 30155632 DOI: 10.1007/s11356-018-3033-8
    Contamination of toxic metals in P. viridis mussels has been prevalently reported; hence, health risk assessment for consuming this aquaculture product as well as the surrounding surface seawater at its harvesting sites appears relevant. Since Kampung Pasir Puteh, Pasir Gudang is the major harvesting site in Malaysia, and because the last heavy metal assessment was done in 2009, its current status remains unclear. Herein, flame atomic absorption spectrometry and flow injection mercury/hydride system were used to determine the concentrations of Pb, Cd, Cu and total Hg in P. viridis mussels and surface seawater (January-March 2015), respectively. Significantly higher concentrations of these metals were found in P. viridis mussels (p 
    Matched MeSH terms: Longitudinal Studies
  7. Ramakrishnan K, Mazlan M, Julia PE, Abdul Latif L
    Spinal Cord, 2011 Aug;49(8):924-7.
    PMID: 21383761 DOI: 10.1038/sc.2011.16
    STUDY DESIGN: Cross-sectional survey.
    OBJECTIVES: To investigate factors related to length of time between spinal cord injury (SCI) onset and start of first post-injury employment.
    SETTING: Persons living with SCI in the community who are members of a disability support organization.
    METHODS: Participants were randomly selected from the membership list of a non-governmental voluntary organization. They met the following four criteria: traumatic SCI, minimum of 15 years of age at the time of survey, a minimum of 2 years after SCI and had been employed for some time since SCI. The main outcome measure was time (in years) from injury onset to beginning first post-injury job.
    RESULTS: Participants averaged 4.9 years (s.d. 5.1) from the time of SCI to their first post-injury job, with a range of 3 months to 20 years. Fifty percent of the participants who eventually returned to work had done so by 4 years. Return to pre-injury employer and employment were associated with early return, whereas having less years in education and being older at the time of injury were associated with longer time to return to work.
    CONCLUSION: Rehabilitation team need to consider return to employment as a realistic goal even many years after SCI. Perhaps a focus on returning more people to their pre-injury employer and employment with added focus and input from rehabilitation team for those with lower education status and older age at time of injury might expedite the process of reintegration.
    Matched MeSH terms: Longitudinal Studies
  8. Ng AK, Hairi NN, Dahlui M, Su TT, Jalaludin MY, Abdul Majid H
    Br J Nutr, 2020 12 14;124(11):1207-1218.
    PMID: 32624008 DOI: 10.1017/S0007114520002202
    The longitudinal relationship between muscle strength, dietary intake and physical activity among adolescents is not well understood. We investigated the trend and longitudinal effects of dietary intakes and physical activity scores on muscle strength in adolescents. This prospective cohort study consisted of 436 adolescents (134 males; 302 females) aged 13 years at baseline (2012) who were followed up at the ages of 15 (2014) and 17 (2016) years, respectively. We measured muscle strength using a calibrated hand dynamometer, estimated dietary intake with a 7-d dietary history and physical activity scores with a validated physical activity questionnaire for older children. A generalised estimating equation was used to examine the effect of dietary intakes and physical activity on muscle strength changes. The analysis was performed separately by sex. The muscle strength for males and females had increased within the 5-year period. The dietary intakes (energy and macronutrients) also increased initially but plateaued after the age of 15 years for both sexes. Females recorded a significant declining trend in physical activity scores compared with males as they grew older. A significant positive longitudinal relationship was found between protein (β = 0·035; P = 0·016), carbohydrate intake (β = 0·002; P = 0·013) and muscle strength among males. However, no longitudinal relationship was found between dietary intake, physical activity and muscle strength among females. Higher protein and carbohydrate intake among males was associated with higher muscle strength but was not observed in females. Nutrition and physical activity focusing on strength building are required in early adolescence and need to be tailored to males and females accordingly.
    Matched MeSH terms: Longitudinal Studies
  9. Abdul Majid H, Ramli L, Ying SP, Su TT, Jalaludin MY, Abdul Mohsein NA
    PLoS One, 2016;11(5):e0155447.
    PMID: 27187889 DOI: 10.1371/journal.pone.0155447
    Optimal nutrition is essential for healthy growth during adolescence. This study aims to investigate the baseline nutritional intake of Malaysian adolescents by gender, body mass index, and places of residence, both urban and rural. A cohort study was conducted consisting of 794 adolescents (aged 13-years) attending 15 public secondary schools from the Central (Kuala Lumpur and Selangor) and Northern (Perak) Regions of Peninsular Malaysia. Qualified dietitians conducted a 7-day historical assessment of habitual food intakes. Facilitated by flipcharts and household measurement tools, detailed information on portion sizes and meal contents were recorded. Nutritionist Pro™ Diet Analysis software was also used to analyze the dietary records.The mean age of the adolescents was 12.86 ± 0.33 y; the mean energy intake was 1659.0 ± 329.6 kcal/d. Males had significantly (P < .001) higher energy intake than females (1774.0 ± 369.8 vs 1595.2 ± 320.6 kcal/d); adolescents in rural schools consumed more energy and cholesterol (P < .001) compared to adolescents in urban schools (1706.1 ± 377.7 kcal/d and 244.1 ± 100.2 mg/d, respectively). Obese adolescents in rural schools consumed more energy and sugar (1987.6 ± 374.0 kcal/d and 48.9 ± 23.0 g/d) (p-value <0.001).The dietary intake of normal weight versus obese adolescents differs by the location of their school. Thus, the implementation of a structured and tailored intervention is recommended to help minimize this nutritional inequality.
    Matched MeSH terms: Longitudinal Studies
  10. Zeldin S, Krauss SE, Kim T, Collura J, Abdullah H
    J Youth Adolesc, 2016 08;45(8):1638-51.
    PMID: 26092232 DOI: 10.1007/s10964-015-0320-2
    After-school programs are prevalent across the world, but there is a paucity of research that examines quality within the "black box" of programs at the point of service. Grounded in current theory, this research examined hypothesized pathways between the experience of youth-adult partnership (youth voice in decision-making; supportive adult relationships), the mediators of program safety and engagement, and the developmental outcomes of youth empowerment (leadership competence, policy control) and community connectedness (community connections, school attachment). Surveys were administered to 207 ethnically diverse (47.3 % female; 63.3 % Malay) youth, age 15-16, attending after-school co-curricular programs in Kuala Lumpur, Malaysia. Results showed that youth voice in program decision-making predicted both indicators of youth empowerment. Neither youth voice nor supportive adult relationships was directly associated with community connectedness, however. Program engagement mediated the associations between youth-adult partnership and empowerment. In contrast, program safety mediated the associations between youth-adult partnership and community connectedness. The findings indicate that the two core components of youth-adult partnership-youth voice and supportive adult relationships-may operate through different, yet complementary, pathways of program quality to predict developmental outcomes. Implications for future research are highlighted. For reasons of youth development and youth rights, the immediate challenge is to create opportunities for youth to speak on issues of program concern and to elevate those adults who are able and willing to help youth exercise their voice.
    Matched MeSH terms: Longitudinal Studies
  11. Lei CP, Har YC, Abdullah KL
    Asian Pac J Cancer Prev, 2011;12(3):797-802.
    PMID: 21627386
    BACKGROUND: Cancer and chemotherapy are sources of anxiety and worry for cancer patients. Information provision is therefore very important to empower them to overcome and adjust to the stressful experience. Thus, nurses should be aware of the informational needs of the patients throughout the course of their care.
    PURPOSE: The purpose of the study was to identify the important information required by breast cancer patients during the first and fourth cycles of chemotherapy from both the patients' and nurses' perceptions.
    METHODOLOGY: This is a longitudinal study used a questionnaire adapted from the Toronto Informational Needs Questionnaires-Breast Cancer (TINQ-BC). Some modifications were made to meet the specific objectives of the study. The study was conducted in the Chemotherapy Day Care at the University of Malaya Medical Centre (UMMC), Malaysia. A total of 169 breast cancer patients who met the inclusion criteria, and 39 nurses who were involved in their care were recruited into the study.
    RESULTS: The overall mean scores at first and fourth cycle of chemotherapy were 3.91 and 3.85 respectively: i.e., between 3 (or important) and 4 (or very important), which indicated a high level of informational needs. There was no significant difference in information needed by the breast cancer patients between the two cycles of chemotherapy (p=0.402). The most important information was from the subscale of disease, followed closely by treatment, physical care, investigative tests and psychosocial needs. Nurses had different views on the important information needed by breast cancer patients at both time points (p = 0.023).
    CONCLUSIONS: Breast cancer patients on chemotherapy have high levels of informational needs with no significant differences in information needed at first cycle as opposed to fourth cycle. There were differences between the perceptions of the breast cancer patients and the nurses on important information needed. A paradigm shift, with an emphasis on patients as the central focus, is needed to enhance the information giving sessions conducted by nurses based on the perceptions of the patients themselves.
    Matched MeSH terms: Longitudinal Studies
  12. Samsudin S, Chui PL, Kamar ABA, Abdullah KL
    Nurs Open, 2023 Jan;10(1):349-357.
    PMID: 36514142 DOI: 10.1002/nop2.1311
    AIM: To assess the effectiveness of the maternal kangaroo care education programme over 1 month and 3 months on the mother's perception, knowledge, perceived barriers and stress.

    DESIGN: A quasi-experimental and longitudinal study was conducted among mothers with premature infants.

    METHODS: Forty-eight mother-infant dyads were enrolled per arm in the control and experimental groups. The control group received standard routine care, while the experimental group received a maternal kangaroo care education program. Data were collected through self-administered Kangaroo Care Questionnaires. Chi-square, the general linear model and repeated measures ANOVA were used to analyse data.

    RESULTS: The demographics are a majority of Malay mothers with multipara, a caesarean delivery with prematurity. At 3 months post-intervention, the experimental group reported a significant reduction in stress, a positive perception and good knowledge towards kangaroo care implementation. The mothers' perceived barriers towards kangaroo care significantly decreased after 3 months in the experimental group.

    Matched MeSH terms: Longitudinal Studies
  13. Abdullah JM, Kumaraswamy N, Awang N, Ghazali MM, Abdullah MR
    Asian J Surg, 2005 Jul;28(3):163-7.
    PMID: 16024307
    To use data from a prospective, longitudinal study to determine whether psychomotor functions improve spontaneously during the first year following paediatric traumatic brain injury without modern rehabilitation facilities in a rural area of Malaysia.
    Matched MeSH terms: Longitudinal Studies
  14. Ten DCY, Jani R, Hashim NH, Saaban S, Abu Hashim AK, Abdullah MT
    Animals (Basel), 2021 Apr 06;11(4).
    PMID: 33917373 DOI: 10.3390/ani11041032
    The critically endangered Malayan tiger (Panthera tigris jacksoni), with an estimated population of less than 200 individuals left in isolated rainforest habitats in Malaysia, is in an intermediate population crash leading to extinction in the next decade. The population has decreased significantly by illegal poaching, environmental perturbation, roadkill, and being captured during human-wildlife conflicts. Forty-five or more individuals were extracted from the wild (four animals captured due to conflict, one death due to canine distemper, one roadkilled, and 39 poached) in the 12 years between 2008-2019. The Malayan tigers are the first wildlife species to test positive for COVID-19 and are subject to the Canine Distemper Virus. These anthropogenic disturbances (poaching and human-tiger conflict) and environmental perturbation (decreasing habitat coverage and quality) have long been identified as impending extinction factors. Roadkill and infectious diseases have emerged recently as new confounding factors threatening Malayan tiger extinction in the near future. Peninsular Malaysia has an existing Malayan tiger conservation management plan; however, to enhance the protection and conservation of Malayan tigers from potential extinction, the authority should reassess the existing legislation, regulation, and management plan and realign them to prevent further population decline, and to better enable preparedness and readiness for the ongoing pandemic and future threats.
    Matched MeSH terms: Longitudinal Studies
  15. Abougalambou SS, Abougalambou AS
    Diabetes Metab Syndr, 2015 Apr-Jun;9(2):98-103.
    PMID: 25470640 DOI: 10.1016/j.dsx.2014.04.019
    BACKGROUND: Diabetic retinopathy (DR) is the leading cause of blindness in the United States and it is the leading cause of new cases of blindness in adults aged 20-74. It is estimated that about 20% of patients with type 2 DM have evidence of diabetic retinopathy at diagnosis with diabetes.
    OBJECTIVE: To evaluate the prevalence of DR and to determine risk factors related to diabetic retinopathy among type 2 diabetes patients attending endocrinology clinics at Hospital Universiti Sains Malaysia (HUSM).
    SUBJECTS AND METHODS: The study design was observational prospective longitudinal follow-up study, the study was conducted with sample of 1077 type 2 diabetes mellitus outpatient recruited via attended the diabetes clinics at HUSM. Diagnosis of retinopathy is based on finding the diagnostic signs of retinopathy on eye exams by fundoscopy. Logistic regression analysis was used to assess the independent variables that affect the development of retinopathy.
    RESULTS: The prevalence of retinopathy was 39.3%. It has been noticed from this study findings, that the progression of retinopathy is been influenced by five independent risk factors such as duration of diabetes, presence neuropathy, total cholesterol at second and third visit and createnine clearance.
    CONCLUSION: DR is highly prevalent among type 2 DM. The progression of retinopathy is been influenced by five independent risk factors such as duration of diabetes, presence neuropathy, total cholesterol at second and third visit and createnine clearance. DR is a serious diabetic complication and public health strategies are required in order to reduce its risk factors and decrease its prevalence.
    KEYWORDS: Prevalence; Retinopathy; Risk factors; Type 2 diabetes mellitus
    Study site: Endocrinology clinics, Hospital Universiti Sains Malaysia (HUSM), Kelantan, Malaysia
    Matched MeSH terms: Longitudinal Studies
  16. Abougalambou SS, Abougalambou AS
    Diabetes Metab Syndr, 2012 Jul-Sep;6(3):167-72.
    PMID: 23158982 DOI: 10.1016/j.dsx.2012.09.002
    OBJECTIVE: The aim of this study was to determine risk factors and prevalence of diabetic neuropathy (DN) among type II diabetic patients in Malaysian hospital setting.
    SUBJECTS AND METHODS: a observational prospective longitudinal follow up study design was selected, total no of respondents were 1077 type 2 diabetes mellitus outpatients recruited via attended the diabetes clinics at Hospital Universiti Sains Malaysia (HUSM) in Kelantan. The diagnosis of neuropathy was confirmed by nerve conduction studies. Logistic regression analysis was used to assess the independent variables that affect the development of neuropathy.
    RESULTS: The prevalence of nephropathy is 54.3%. Longitudinal logistic regression identified four predictive variables on the development and progression of diabetic neuropathy that are: duration of diabetes, retinopathy, HbA1c at second visit, and creatinine clearance third visit.
    CONCLUSION: Findings of this study show high prevalence of diabetic neuropathy. HbA1c and creatinine clearance are two modifiable risk factors for the development of diabetic neuropathy.
    Study site: Diabetes clinics, Hospital Universiti Sains Malaysia (HUSM), Kelantan, Malaysia
    Matched MeSH terms: Longitudinal Studies
  17. Abougalambou SSI, Ahmed NO, Abougalambou AS
    Diabetes Metab Syndr, 2017 Nov;11 Suppl 1:S445-S449.
    PMID: 28434857 DOI: 10.1016/j.dsx.2017.03.033
    BACKGROUND AND OBJECTIVE: Type 2 DM is rapidly rising as a global health care problem that threatens to reach pandemic levels by 2030. Type 2 diabetes mellitus is a disease with no cure and chronic disease that results in major morbidity and mortality. The main objective of this study is to evaluate postprandial plasma glucose level and to determine factors affect on postprandial plasma glucose level among type 2 diabetes outpatients attending endocrinology clinics at Hospital Universiti Sains Malaysia, Teaching Hospital.
    SUBJECTS AND METHODS: The study design was observational prospective longitudinal follow-up study, the study was conducted with sample of 1077 type 2 diabetes mellitus outpatient recruited via attended the diabetes clinics at Hospital Universiti Sains Malaysia (HUSM) in Kelantan. Post prandial plasma glucose (PPG) parameter to measure the glycaemic control. Logistic regression analysis was used to assess the independent variables that affect the PPG control.
    RESULTS: About 426 (39.6%) of the patients did not achieve the optimal postprandial plasma glucose level (<10mmol/l). In this study, the possible factors that affect postprandial plasma glucose levels (PPG) were found to be gender (OR=0.77) and the duration of diabetes (OR=1.12).
    CONCLUSION: It has been found that gender and the duration of diabetes are the factors affecting PPG. New strategy to improve the current status of control of diabetes is needed. The study recommends that health-care providers should pay more attention to type 2 DM male patients and patients who had diabetic for long time.
    Study site: Endocrine clinic, Hospital Universiti Sains Malaysia (HUSM)
    Matched MeSH terms: Longitudinal Studies
  18. Abu Hassan MR, Abu Bakar MH, Dambul K, Adikan FR
    Sensors (Basel), 2012;12(11):15820-6.
    PMID: 23202233 DOI: 10.3390/s121115820
    In this paper, we present the development and testing of an optical-based sensor for monitoring the corrosion of reinforcement rebar. The testing was carried out using an 80% etched-cladding Fibre Bragg grating sensor to monitor the production of corrosion waste in a localized region of the rebar. Progression of corrosion can be sensed by observing the reflected wavelength shift of the FBG sensor. With the presence of corrosion, the etched-FBG reflected spectrum was shifted by 1.0 nm. In addition, with an increase in fringe pattern and continuously, step-like drop in power of the Bragg reflected spectrum was also displayed.
    Matched MeSH terms: Longitudinal Studies
  19. Fauzi Mohamed Yusof, Mohd Hafiz Mohd, Yazariah Mohd Yatim, Ahmad Izani Md. Ismail
    MATEMATIKA, 2020;36(1):1-14.
    MyJurnal
    In this paper, the combined influences of biotic interactions, environmental components and harvesting strategy on the spread of Hantavirus are investigated. By employing a multi-species model consisting of (susceptible and infected) rodents and alien species, we show that interspecific competition from alien species has an effect in reducing the spread of infection, and this species could be employed as a potential biocontrol agent. Our analysis using numerical continuation and simulation also reveals the conditions under which Hantavirus infection occurs and disappears as the environmental conditions and the intensity of harvesting change. Without harvesting, infection emerges when environments are conducive. Inclusion of moderate harvesting in favourable environments can lead to disappearance of infection among rodent species. However, as the intensity of harvesting increases, this situation can cause extinction of all rodents species and consequently, jeopardise biodiversity. Overall, our results demonstrate how the interplay of different factors can combine to determine the spread of infectious diseases.
    Matched MeSH terms: Longitudinal Studies
  20. Jasim Mohammed M, Ibrahim RW, Ahmad MZ
    Saudi J Biol Sci, 2017 Mar;24(3):737-740.
    PMID: 28386204 DOI: 10.1016/j.sjbs.2017.01.050
    In this paper, we consider a low initial population model. Our aim is to study the periodicity computation of this model by using neutral differential equations, which are recognized in various studies including biology. We generalize the neutral Rayleigh equation for the third-order by exploiting the model of fractional calculus, in particular the Riemann-Liouville differential operator. We establish the existence and uniqueness of a periodic computational outcome. The technique depends on the continuation theorem of the coincidence degree theory. Besides, an example is presented to demonstrate the finding.
    Matched MeSH terms: Longitudinal Studies
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