Displaying publications 1 - 20 of 21 in total

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  1. Mohamed, F., Jamil, M., Zain, M. F. M.
    MyJurnal
    – Today, the new valuation of sustainable materials in light of their ability to fulfill the
    requirements of sustainable development has raised the bar. The economic growth will result in
    increased material throughput as well as solid and hazardous waste generation. Understanding the
    life-cycle of materials management and monitoring materials consumption trends will provide the
    information in determination of how we can satisfy our materials needs at acceptable economic and
    environmental costs to assist both regionally and globally. This paper reviews the challenges for
    sustainable development from material aspect and the future prospect of the utilization of sustainable
    materials in construction industry. Policy designs together with steering mechanisms are required to
    facilitate and support further mainstream sustainability transitions. Besides the price system,
    regulatory framework and technical information, human mindsets must work together to enable and
    encourage life-cycle of materials management. Further research and development will not only provide
    innovative solutions to existing problems but will in particular offer new opportunities through the
    development of innovative materials to improve the quality of life.
  2. Malini MN, Zain MM
    Med J Malaysia, 2020 01;75(1):24-28.
    PMID: 32008015
    BACKGROUND: In reproductive medicine poor ovarian response (POR) among women undergoing in vitro fertilisation (IVF) is of great concern. Meta-analysis showed that Dehydroepiandrosterone (DHEA) administration resulted in a significant increase in the number of oocytes retrieved in women with POR. The aim of this study was to assess the effectiveness of DHEA supplementation on IVF outcomes among poor responders undergoing IVF.

    METHODS: Sixteen patients who were diagnosed with POR scheduled to undergo their second cycle of Intracytoplasmic sperm injection (ICSI)/embryo transfer cycle were enrolled. All enrolled patients had earlier undergone their first ICSI/embryo transfer cycle at least four months prior to this study. All subjects were given DHEA supplementation of 25mg three times daily for at least three months prior to their second ICSI/embryo transfer cycle. Statistical analysis of various ovarian response and ICSI outcomes parameter were compared pre and post DHEA.

    RESULTS: Sixteen women with the mean age of 35 years were enrolled in the study. The comparative analysis of results showed a significant increase in the number of good quality of embryos obtained (p<0.05). After the treatment with DHEA, there was an improvement in the number of oocytes retrieved, Metaphase II (MII) oocyte (mature) oocytes obtained, fertilised and transferrable embryos and the pregnancy rate. There was no significant effect of DHEA treatment on the number of days of stimulation and cumulative dose of gonadotrophins used.

    CONCLUSION: Our results is able to show that DHEA supplementation may help to enhance IVF-ICSI outcomes in women with POR especially in those age 35 years and below.

  3. Teh YH, Tan YP, Zain MM
    Med J Malaysia, 2017 08;72(4):254-256.
    PMID: 28889142 MyJurnal
    Eyelid reconstruction is complex and challenging since it is not only for structural and functional restoration, but also for an acceptable aesthetic result. In full thickness eyelid injuries, it will involve both anterior and posterior lamella. Therefore, when reconstructing the defect, it requires at least two layers; one will be a flap with blood supply, and the other can be a free graft. In this case, a rotational advancement cheek flap and composite graft were used to reconstruct the lower eyelid.
  4. Azhar ZM, Zubaidah JO, Norjan KO, Zhuang CY, Tsang F
    Nutr J, 2013;12:121.
    PMID: 23945213 DOI: 10.1186/1475-2891-12-121
    It has long been postulated that the relative abundance of specific nutrients can affect cognitive processes and emotions. Newly described influences of dietary factors on neuronal function and synaptic plasticity have revealed some of the vital mechanisms that could be responsible for the action of diet on brain health and cognitive function. Here, through a double-blind, randomized, placebo-controlled trial, we asked if the newly discovered chicken meat ingredient-168 (CMI-168) could be beneficial to the cognitive function in healthy adults.
  5. Nath RK, Zain MF, Kadhum AA
    ScientificWorldJournal, 2013;2013:686497.
    PMID: 24376384 DOI: 10.1155/2013/686497
    The addition of a photocatalyst to ordinary building materials such as concrete creates environmentally friendly materials by which air pollution or pollution of the surface can be diminished. The use of LiNbO3 photocatalyst in concrete material would be more beneficial since it can produce artificial photosynthesis in concrete. In these research photoassisted solid-gas phases reduction of carbon dioxide (artificial photosynthesis) was performed using a photocatalyst, LiNbO3, coated on concrete surface under illumination of UV-visible or sunlight and showed that LiNbO3 achieved high conversion of CO2 into products despite the low levels of band-gap light available. The high reaction efficiency of LiNbO3 is explained by its strong remnant polarization (70 µC/cm(2)), allowing a longer lifetime of photoinduced carriers as well as an alternative reaction pathway. Due to the ease of usage and good photocatalytic efficiency, the research work done showed its potential application in pollution prevention.
  6. Baharuddin H, Mohd Zim MA, Rosman A, Mohd Zain M
    Here we present a 24-year-old lady with systemic lupus erythematosus (SLE) whom we diagnosed with shrinking lung syndrome (SLS), a rare manifestation of SLE. The initial SLE manifestation was alopecia, thrombocytopenia, serositis and vasculitis. Anti-nuclear antibody (ANA), anti-double stranded DNA (dsDNA) antibody, anti-ribonucleic (RNP) and anti-Ro antibody were positive. A year after diagnosis, she started to develop intermittent dyspnea and was hospitalised on three occasions. Lung examinations revealed reduced breath sounds at both bases and dullness at the right base. Multiple chest radiographs showed bilateral raised hemi-diaphragms. Other investigations including CT pulmonary angiogram, high resolution CT of the thorax, ventilation-perfusion scan and echocardiogram were not significant. On the third hospital admission, we noticed bilateral small lung volumes in the previous high resolution CT scan. Inspiratory and expiratory chest radiographs were performed and showed minimal change in lung volumes and a diagnosis of shrinking lung syndrome (SLS) was made. Her SLE remained active with lupus nephritis despite multiple immunosuppression and she passed away two years later due to sepsis with multi-organ failure.
  7. Wong AR, Amelia A, Mohd Zain MR, Sayuti KA
    Med J Malaysia, 2022 Jan;77(1):101-103.
    PMID: 35087005
    Left aorto-ventricular tunnel is a rare congenital heart disorder. A then 19-year-old young lady was referred to our clinic for chronic rheumatic heart disease with aortic regurgitation. However, because of an almost continuous murmur, and an unusual transthoracic echo, she underwent various investigations, finally revealing a rare type 2 left aorto-ventricular tunnel. She had been variously diagnosed as chronic rheumatic heart disease with aortic regurgitation, bicuspid aortic valve with aortic regurgitation, and then possibly coronary arterial (cameral) fistula (based on 2D transthoracic echo) and finally left aorto-ventricular tunnel. This is the first case described in South East Asia who is asymptomatic, apart from a murmur, and her long journey to this final diagnosis illustrates the need to "chase shadows" on echoes, to come to a proper conclusion for the patient.
  8. Foo CY, Mansor NAN, Ch'ng SS, Mohd Zain M
    J Mark Access Health Policy, 2023;11(1):2173117.
    PMID: 36819892 DOI: 10.1080/20016689.2023.2173117
    INTRODUCTION: To ensure the sustainability of the AT access improvement, it is important that health system stakeholders have timely, analyzed information accessible for reference and decision-making support. In this study, we projected the direct costs required as well as the expected direct medical cost-offset and productivity benefits resulting from improving the disease control.

    METHODS: We implemented a deterministic, prevalence-based mathematical model to project the annual cost of rheumatoid arthritis (RA) management within the public healthcare system in Malaysia. We also calculated the annual productivity loss due to uncontrolled RA in monetary value. Using the projection model, we compared the projected costs of the status quo scenario vs. several scenarios of improved advanced therapy (AT) access over a 5-year period.

    RESULTS: We projected that between 10,765 and 11,024 RA patients in Malaysia over the period of 2020-2024 will need access to AT due to treatment failure with conventional synthetic disease modifying antirheumatic drugs (DMARDs). The projected net total medical cost under the status quo scenario were 163.5 million annually on average (approximately MYR 15,000 per patient per year). Cost related to health service utilization represented the heaviest component, amounting to 71.8% followed by drug cost (24.7%). Under the access improvement scenarios, drug cost constituted a higher proportion of the total medical, ranging from 25.6% to 30.4%. In contrast, the cost of health service utilization shown a reverse pattern (reducing to between 66.3% and 70.1%). Productivity costs were also expected to reduce as AT access improved leading to better outcomes. Treatment shifts to targeted synthetic DMARDs in anticipation of price adjustment appeared to have a cost saving advantage to the health system if all other parameters remain unchanged.

    DISCUSSION: Improving AT access for RA patients towards the aspirational target appeared to be feasible given the current health budget in Malaysia. Broader socio-economic consequences of productivity and income loss should be included as an important part of the policy consideration. The financial implication of different AT utilization mixes and the anticipated price adjustment will likely result in some cost saving to the health system.

  9. Lau IS, Gun SC, Yeap SS, Mohd Zain M, Mohd Yusoof H, Sargunan S, et al.
    Malays Fam Physician, 2021 Jul 22;16(2):2-6.
    PMID: 34386157 DOI: 10.51866/rv1206
    Chronic low back pain, defined as back pain lasting for more than three months, can be divided into mechanical or inflammatory back pain (IBP). IBP typically starts in patients below the age of 40, is improved with activity and worsens with rest. IBP is strongly associated with axial spondyloarthritis. Early recognition of IBP among primary care physicians is essential for timely diagnosis and intervention to ensure the best outcomes for patients with axial spondyloarthritis. This paper describes the Malaysian Society of Rheumatology's recently developed Inflammatory Back Pain Referral Algorithm for primary care physicians, which aims to facilitate the early identification and referral of IBP patients to rheumatologists.
  10. Roslan EJ, Kelly EG, Zain MA, Basiron NH, Imran FH
    Med J Malaysia, 2017 02;72(1):85-87.
    PMID: 28255154 MyJurnal
    Breast reconstructive surgery has evolved tremendously since its inception. Following tumour clearance surgery, physical restoration with breast reconstruction is an important aspect of physical and emotional rehabilitation. Various methods have been described to suit patients demand for the best aesthetic outcome. Surgeon's preference, experience and practicality of differing procedures must be considered. We describe a simultaneous bilateral breast reconstruction with free deep inferior epigastric (DIEP) flap and pedicled transverse rectus abdominis musculocutaneous (TRAM) flap immediately post mastectomies for bilateral breast cancers. The surgery described has resulted in a reasonable technical ease, acceptable flap and abdominal morbidity and good aesthetic outcome.
  11. Nahar S, Zain MFM, Kadhum AAH, Hasan HA, Hasan MR
    Materials (Basel), 2017 Jun 08;10(6).
    PMID: 28772988 DOI: 10.3390/ma10060629
    In recent years, the increasing level of CO₂ in the atmosphere has not only contributed to global warming but has also triggered considerable interest in photocatalytic reduction of CO₂. The reduction of CO₂ with H₂O using sunlight is an innovative way to solve the current growing environmental challenges. This paper reviews the basic principles of photocatalysis and photocatalytic CO₂ reduction, discusses the measures of the photocatalytic efficiency and summarizes current advances in the exploration of this technology using different types of semiconductor photocatalysts, such as TiO₂ and modified TiO₂, layered-perovskite Ag/ALa₄Ti₄O15 (A = Ca, Ba, Sr), ferroelectric LiNbO₃, and plasmonic photocatalysts. Visible light harvesting, novel plasmonic photocatalysts offer potential solutions for some of the main drawbacks in this reduction process. Effective plasmonic photocatalysts that have shown reduction activities towards CO₂ with H₂O are highlighted here. Although this technology is still at an embryonic stage, further studies with standard theoretical and comprehensive format are suggested to develop photocatalysts with high production rates and selectivity. Based on the collected results, the immense prospects and opportunities that exist in this technique are also reviewed here.
  12. Awaad AS, Alafeefy AM, Alasmary FAS, El-Meligy RM, Zain ME, Alqasoumi SI
    Saudi Pharm J, 2017 Nov;25(7):967-971.
    PMID: 29158702 DOI: 10.1016/j.jsps.2017.02.012
    A novel and safe essential amino acid (Leucine) incorporating sulfanilamide was synthesized, and evaluated for its anti-ulcerogenic activity and in vitro anti-Helicobacter pylori activity. The new molecule showed a dose dependent activity against absolute ethanol-induced ulcer in rats, it produced percent protection of control ulcer by 66.7 at dose 100 mg/kg. In addition it showed a potent anti-Helicobacter pylori activity in vitro against 7 clinically isolated strains. The minimum inhibitory concentration (MIC) ranged from 12.5 to 50 μg/ml. The preliminary safety studies and toxicity profile are optimistic and encouraging.
  13. Mohamed Noor NM, Ibrahim MI, Hairon SM, Mohd Zain M, Satiman MSN
    Int J Environ Res Public Health, 2022 Oct 18;19(20).
    PMID: 36294066 DOI: 10.3390/ijerph192013486
    BACKGROUND: Compassionate care has been increasingly highlighted in the past few decades worldwide, including in Malaysia. Despite acknowledging its importance, Malaysia still lacks a validated tool that can be used to assess the level of compassionate care from the patient's perspective. Therefore, this study aims to validate and translate the Relational Aspect of Care Questionnaire (RAC-Q) into the Malay language.

    METHODS: Permission to use and translate the original RAC-Q into the Malay language was obtained. The RAC-Q was then translated into the Malay language following the 10 steps proposed for the translation of a patient-reported outcome questionnaire. A pretest was conducted based on 30 inpatients to assess the appropriateness and clarity of the finalized translated questionnaire. A cross-sectional study was performed based on 138 inpatients from six adult wards of a teaching hospital so as to validate the translated questionnaire. The data were analyzed using R software version 4.1.3 (R Core Team, Vienna, Austria, 2020). The results were presented descriptively as numbers and percentages or means and standard deviations. A confirmatory factor analysis was performed using robust estimators.

    RESULTS: The analysis showed that the measurement model of the RAC-Q Malay version (RAC-QM) fits well based on several fit indices: a standardized factor loading range from 0.40 to 0.73, comparative fit index (CFI) of 0.917, Tucker-Lewis fit index (TLI) of 0.904, root mean square error of approximation (RMSEA) of 0.06, and a standardized root mean square residual (SRMR) of 0.073. It has good reliability, with a Cronbach's alpha of 0.857 and a composite ratio of 0.857.

    CONCLUSION: The RAC-QM demonstrated good psychometric properties and is valid and reliable based on the confirmatory analysis, and it can thus be used as a tool for evaluating the level of compassionate care in Malaysia.

  14. Mohd Kamaruzaman AZ, Ibrahim MI, Mokhtar AM, Mohd Zain M, Satiman SN, Yaacob NM
    Int J Environ Res Public Health, 2022 May 26;19(11).
    PMID: 35682042 DOI: 10.3390/ijerph19116454
    After a patient safety incident, the involved healthcare providers may experience sustained second-victim distress and reduced professional efficacy, with subsequent negative work-related outcomes and the cultivation of resilience. This study aims to investigate the factors affecting negative work-related outcomes and resilience with a hypothetical triad of support as the mediators: colleague, supervisor, and institutional support. This cross-sectional study recruited 733 healthcare providers from three tertiary care hospitals in Kelantan, Malaysia. Three steps of hierarchical linear regression were developed for both outcomes (negative work-related outcomes and resilience). Four multiple mediator models of the support triad were analyzed. Second-victim distress, professional efficacy, and the support triad contributed significantly in all the regression models. Colleague support partially mediated the relationship defining the effects of professional efficacy on negative work-related outcomes and resilience, whereas colleague and supervisor support partially mediated the effects of second-victim distress on negative work-related outcomes. Similar results were found regarding resilience, with all support triads producing similar results. As mediators, the support triads ameliorated the effect of second-victim distress on negative work-related outcomes and resilience, suggesting an important role of having good support, especially after encountering patient safety incidents.
  15. Adeel M, Zain M, Fahad S, Rizwan M, Ameen A, Yi H, et al.
    Environ Sci Pollut Res Int, 2018 Dec;25(36):36712-36723.
    PMID: 30377972 DOI: 10.1007/s11356-018-3588-4
    Since the inception of global industrialization, the growth of steroid estrogens becomes a matter of emerging serious concern for the rapid population. Steroidal estrogens are potent endocrine-upsetting chemicals that are excreted naturally by vertebrates (e.g., humans and fish) and can enter natural waters through the discharge of treated and raw sewage. Steroidal estrogens in plants may enter the food web and become a serious threat to human health. We evaluated the uptake and accumulation of ethinylestradiol (EE2) and 17β-estradiol (17β-E2) in lettuce plants (Lactuca sativa) grown under controlled environmental condition over 21 days growth period. An effective analytical method based on ultrasonic liquid extraction (ULE) for solid samples and solid phase extraction (SPE) for liquid samples with gas chromatography-mass spectrometry (GC/MS) has been developed to determine the steroid estrogens in lettuce plants. The extent of uptake and accumulation was observed in a dose-dependent manner and roots were major organs for estrogen deposition. Unlike the 17β-E2, EE2 was less accumulated and translocated from root to leaves. For 17β-E2, the distribution in lettuce was primarily to roots after the second week (13%), whereas in leaves it was (10%) over the entire study period. The distribution of EE2 at 2000 μg L-1 in roots and leaves was very low (3.07% and 0.54%) during the first week and then was highest (12% in roots and 8% in leaves) in last week. Bioaccumulation factor values of 17β-E2 and EE2 in roots were 0.33 and 0.29 at 50 μg L-1 concentration as maximum values were found at 50 μg L-1 rather than 500 and 2000 in all observed plant tissues. Similar trend was noticed in roots than leaves for bioconcentration factor as the highest bioconcentration values were observed at 50 μg L-1 concentration instead of 500 and 2000 μg L-1 spiked concentration. These findings mainly indicate the potential for uptake and bioaccumulation of estrogens in lettuce plants. Overall, the estrogen contents in lettuce were compared to the FAO/WHO recommended toxic level and were found to be higher than the toxic level which is of serious concern to the public health. This analytical procedure may aid in future studies on risks associated with uptake of endocrine-disrupting chemicals in lettuce plants.
  16. Mohamed MA, Abd Mutalib M, Mohd Hir ZA, M Zain MF, Mohamad AB, Jeffery Minggu L, et al.
    Int J Biol Macromol, 2017 Oct;103:1232-1256.
    PMID: 28587962 DOI: 10.1016/j.ijbiomac.2017.05.181
    A combination between the nanostructured photocatalyst and cellulose-based materials promotes a new functionality of cellulose towards the development of new bio-hybrid materials for various applications especially in water treatment and renewable energy. The excellent compatibility and association between nanostructured photocatalyst and cellulose-based materials was induced by bio-combability and high hydrophilicity of the cellulose components. The electron rich hydroxyl group of celluloses helps to promote superior interaction with photocatalyst. The formation of bio-hybrid nanostructured are attaining huge interest nowadays due to the synergistic properties of individual cellulose-based material and photocatalyst nanoparticles. Therefore, in this review we introduce some cellulose-based material and discusses its compatibility with nanostructured photocatalyst in terms of physical and chemical properties. In addition, we gather information and evidence on the fabrication techniques of cellulose-based hybrid nanostructured photocatalyst and its recent application in the field of water treatment and renewable energy.
  17. Mohamed MA, W Salleh WN, Jaafar J, Ismail AF, Abd Mutalib M, Mohamad AB, et al.
    Carbohydr Polym, 2017 Feb 10;157:1892-1902.
    PMID: 27987909 DOI: 10.1016/j.carbpol.2016.11.078
    This research involves the rare utilisation of the kapok fibre (Ceiba pentandra) as a raw material for the fabrication of cellulose nanocrystal (CNC) and self-assembled CNC membranes. The isolation of CNC from Ceiba pentandra began with the extraction of cellulose via the chemical alkali extraction by using 5wt% NaOH, followed by the typical acidified bleaching method and, finally, the CNC production through acid hydrolysis with 60wt% H2SO4 at the optimum time of 60min. The prepared CNC was then employed for the preparation of self-assembled membrane through the water suspension casting evaporation technique. The obtained CNC membrane was characterised in terms of its composition, crystallinity, thermal stability, as well as, structural and morphological features with the use of several techniques including FTIR, XRD, AFM, TEM, FESEM, and TGA. The FESEM and AFM analyses had illustrated the achievement of a self-assembled CNC membrane with a smooth surface and a well-distributed nano-porous structure, with the porosity of 52.82±7.79%. In addition, the findings proved that the self-assembled CNC membrane displayed good adsorption capability indicated by the recorded efficiency of 79% and 85% for 10mg/L and 5mg/L of methylene blue in an aqueous solution, respectively.
  18. Bibi S, Raza M, Shahbaz M, Ajmal M, Mehak A, Fatima N, et al.
    Plant Physiol Biochem, 2023 Oct;203:108067.
    PMID: 37832369 DOI: 10.1016/j.plaphy.2023.108067
    Agronomic crops can benefit from the application of nanoscale materials in order to control phytopathogens and improve plant growth. Bipolaris sorokiniana, a soil- and seed-borne fungus, causes severe yield losses in wheat. In order to determine the physio-chemical changes in wheat under biotic stress of B. sorokiniana, the current study aimed to synthesis silver nanoparticles (AgNPs) using Allium sativum bulb extract. Herein, we applied the silver nanoparticles (AgNPs) as a foliar spray on two wheat varieties (Pakistan-2013, and NARC-2011) at the concentrations of 10, 20, 30, and 40 mg/L to suppress B. sorokiniana. Among all the applied concentrations of AgNPs, the 40 mg/L concentration demonstrated the most effective outcome in reduction of the intensity of spot blotch and improved the morphological, physiological, biochemical parameters, as well as antioxidant activity in wheat plant. Foliar application of AgNPs at 40 mg/L Pakistan-2013 and NARC-2011 wheat varieties significantly increased chlorophyll a 84.8% and 53.4%, chlorophyll b 28.9% and 84.3%, total chlorophyll content 294.3% and 241.2%, membrane stability index 7.5% and 6.1%, relative water contents 25.4% and 10.5%, proline content 320.5% and 609.9%, and soluble sugar content 120% and 259.4%, respectively, compared to control and diseased plant. This is the first study provides important insights into the role of phyto-mediated AgNPs in increasing resistant of wheat infected with B. sorokiniana. These findings offers valuable new insights that may be useful for reducing disease incidence in wheat fields.
  19. Nor Hashimah AMN, Lim AL, Mohd Zain M, Gun SC, Mohd Isa L, Chong HC, et al.
    Med J Malaysia, 2023 Dec;78(7):870-875.
    PMID: 38159920
    INTRODUCTION: The aim of this study was to analyse the clinical characteristics of patients with rheumatoid arthritis receiving biologics therapy and investigate the association between types of biologics and tuberculosis (TB) infections in 13 tertiary hospitals in Malaysia.

    MATERIALS AND METHODS: This was a retrospective study that included all RA patients receiving biologics therapy in 13 tertiary hospitals in Malaysia from January 2008 to December 2018.

    RESULTS: We had 735 RA patients who received biologics therapy. Twenty-one of the 735 patients were diagnosed with TB infection after treatment with biologics. The calculated prevalence of TB infection in RA patients treated with biologics was 2.9% (29 per 1000 patients). Four groups of biologics were used in our patient cohort: monoclonal TNF inhibitors, etanercept, tocilizumab, and rituximab, with monoclonal TNF inhibitors being the most commonly used biologic. The median duration of biologics therapy before the diagnosis of TB was 8 months. 75% of patients had at least one co-morbidity and all patients had at least one ongoing cDMARD therapy at the time of TB diagnosis. More than half of the patients were on steroid therapy with an average prednisolone dose of 5 mg daily.

    CONCLUSION: Although the study population and data were limited, this study illustrates the spectrum of TB infections in RA patients receiving biologics and potential risk factors associated with biologics therapy in Malaysia.

  20. Adeel M, Lee JY, Zain M, Rizwan M, Nawab A, Ahmad MA, et al.
    Environ Int, 2019 06;127:785-800.
    PMID: 31039528 DOI: 10.1016/j.envint.2019.03.022
    BACKGROUND: Rare earth elements (REEs) are gaining attention due to rapid rise of modern industries and technological developments in their usage and residual fingerprinting. Cryptic entry of REEs in the natural resources and environment is significant; therefore, life on earth is prone to their nasty effects. Scientific sectors have expressed concerns over the entry of REEs into food chains, which ultimately influences their intake and metabolism in the living organisms.

    OBJECTIVES: Extensive scientific collections and intensive look in to the latest explorations agglomerated in this document aim to depict the distribution of REEs in soil, sediments, surface waters and groundwater possibly around the globe. Furthermore, it draws attention towards potential risks of intensive industrialization and modern agriculture to the exposure of REEs, and their effects on living organisms. It also draws links of REEs usage and their footprints in natural resources with the major food chains involving plants, animals and humans.

    METHODS: Scientific literature preferably spanning over the last five years was obtained online from the MEDLINE and other sources publishing the latest studies on REEs distribution, properties, usage, cycling and intrusion in the environment and food-chains. Distribution of REEs in agricultural soils, sediments, surface and ground water was drawn on the global map, together with transport pathways of REEs and their cycling in the natural resources.

    RESULTS: Fourteen REEs (Ce, Dy, Er, Eu, Gd, Ho, La, Lu, Nd, Pr, Sm, Tb, Th and Yb) were plighted in this study. Wide range of their concentrations has been detected in agricultural soils (<15.9-249.1 μg g-1) and in groundwater (<3.1-146.2 μg L-1) at various sites worldwide. They have strong tendency to accumulate in the human body, and thus associated with kidney stones. The REEs could also perturb the animal physiology, especially affecting the reproductive development in both terrestrial and aquatic animals. In plants, REEs might affect the germination, root and shoot development and flowering at concentration ranging from 0.4 to 150 mg kg-1.

    CONCLUSIONS: This review article precisely narrates the current status, sources, and potential effects of REEs on plants, animals, humans health. There are also a few examples where REEs have been used to benefit human health. However, still there is scarce information about threshold levels of REEs in the soil, aquatic, and terrestrial resources as well as living entities. Therefore, an aggressive effort is required for global action to generate more data on REEs. This implies we prescribe an urgent need for inter-disciplinary studies about REEs in order to identify their toxic effects on both ecosystems and organisms.

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