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Fulltext Advancement in Benthic Microbial Fuel Cells toward Sustainable Bioremediation and Renewable Energy Production

Umar MF, Rafatullah M, Abbas SZ, Mohamad Ibrahim MN, Ismail N

Int J Environ Res Public Health, 2021 Apr 06;18(7).
PMID: 33917378 DOI: 10.3390/ijerph18073811

Anthropogenic activities are largely responsible for the vast amounts of pollutants such as polycyclic aromatic hydrocarbons, cyanides, phenols, metal derivatives, sulphides, and other chemicals in wastewater. The excess benzene, toluene and xylene (BTX) can cause severe toxicity to living organisms in wastewater. A novel approach to mitigate this problem is the benthic microbial fuel cell (BMFC) setup to produce renewable energy and bio-remediate wastewater aromatic hydrocarbons. Several mechanisms of electrogens have been utilized for the bioremediation of BTX through BMFCs. In the future, BMFCs may be significant for chemical and petrochemical industry wastewater treatment. The distinct factors are considered to evaluate the performance of BMFCs, such as pollutant removal efficiency, power density, and current density, which are discussed by using operating parameters such as, pH, temperature and internal resistance. To further upgrade the BMFC technology, this review summarizes prototype electrode materials, the bioremediation of BTX, and their applications.
Aluminium removal and recovery from wastewater and soil using isolated indigenous bacteria

Purwanti IF, Kurniawan SB, Ismail N', Imron MF, Abdullah SRS

J Environ Manage, 2019 Nov 01;249:109412.
PMID: 31445374 DOI: 10.1016/j.jenvman.2019.109412

This paper elucidates the capability of isolated indigenous bacteria to remove aluminium from wastewater and soil. Two indigenous species of Brochothrix thermosphacta and Vibrio alginolyticus were isolated from an aluminium-contaminated site. These two species were used to treat aluminium-containing wastewater and contaminated soil using the bioaugmentation method. B. thermosphacta showed the highest aluminium removal of 57.87 ± 0.45% while V. alginolyticus can remove aluminium up to 59.72 ± 0.33% from wastewater. For aluminium-contaminated soil, B. thermosphacta and V. alginolyticus, showed a highest removal of only 4.58 ± 0.44% and 5.48 ± 0.58%, respectively. The bioaugmentation method is more suitable to be used to treat aluminium in wastewater compared to contaminated soil. The produced biomass separation after wastewater treatment was so much easier and applicable, compared to the produced biomass handling from contaminated soil treatment. A 48.55 ± 2.45% and 40.12 ± 4.55% of aluminium can be recovered from B. thermosphacta and V. alginolyticus biomass, respectively, with 100 mg/L initial aluminium concentration in wastewater.
Analysis of heavy metal concentrations in sediments of selected estuaries of Malaysia--a statistical assessment

Alkarkhi AF, Ismail N, Ahmed A, Easa Am

Environ Monit Assess, 2009 Jun;153(1-4):179-85.
PMID: 18504644 DOI: 10.1007/s10661-008-0347-x

Statistical analysis of heavy metal concentrations in sediment was studied to understand the interrelationship between different parameters and also to identify probable source component in order to explain the pollution status of selected estuaries. Concentrations of heavy metals (Cu, Zn, Cd, Fe, Pb, Cr, Hg and Mn) were analyzed in sediments from Juru and Jejawi Estuaries in Malaysia with ten sampling points of each estuary. The results of multivariate statistical techniques showed that the two regions have different characteristics in terms of heavy metals selected and indicates that each region receives pollution from different sources. The results also showed that Fe, Mn, Cd, Hg, and Cu are responsible for large spatial variations explaining 51.15% of the total variance, whilst Zn and Pb explain only 18.93 of the total variance. This study illustrates the usefulness of multivariate statistical techniques for evaluation and interpretation of large complex data sets to get better information about the heavy metal concentrations and design of monitoring network.
Analysis of water compartment in dengue patients

Ibrahim F, Ooi KF, Ismail NA, Taib MN, Wan Abas WA

Conf Proc IEEE Eng Med Biol Soc, 2007 2 7;2005:4130-3.
PMID: 17281142

This paper describes the water compartments in healthy subjects and dengue patients on the day of defervescence of fever using bioelectrical impedance analysis. A total of 223 healthy subjects (65 males and 158 females) and 210 dengue patients (119 males and 91 females) in Hospital Universiti Kebangsaan Malaysia (HUKM), were studied. The ages for healthy subjects vary between 14 and 60 years old with mean age of 26.05 years while the ages for the dengue patients vary between 12 and 83 years old with mean age of 30.14 years. The parameters of water compartments investigated were total body water (TBW), extracellular water (ECW) and intracellular water (ICW). There were significant difference between healthy subjects and dengue patients for both male (p<0.05) and female (p<0.001) beginning on fever day 0 till fever day 4. The mean TBW and ECW values of dengue patients obtained were found to be higher than the normal healthy subjects while the mean ICW was lower. The mean TBW and ICW for male were higher than female while the mean ECW for male was lower than female for healthy subjects and dengue patients.
Fulltext Anthropometry of Malaysian young adults

Karmegam, Karuppiah, Salit MS, Ismail MY, Ismail N, Tamrin SB, et al.

J Hum Ergol (Tokyo), 2011 Dec;40(1-2):37-46.
PMID: 25665206 DOI: 10.11183/jhe.40.37

This paper presents the results of an anthropometric data collected from polytechnic students in Malaysia. A total of 1032 (595 males and 437 females) students participated in the study. Their ages ranged from 18 to 24 years. A total of 34 anthropometric dimensions were measured. Descriptive statistics such as mean, standard deviation, standard error of mean, coefficient of variation, minimum, maximum and percentile for each parameter were estimated. In addition, the comparison between Malaysia anthropometric data and Thailand (South) anthropometric data were also presented. The results show that there is a total of 12 and 11 (of dimensions parameters) significant differences (p < 0.05) between the male and female adults respectively.
Anti-angiogenic activity of Gynura segetum leaf extracts and its fractions

Seow LJ, Beh HK, Majid AM, Murugaiyah V, Ismail N, Asmawi MZ

J Ethnopharmacol, 2011 Mar 24;134(2):221-7.
PMID: 21167271 DOI: 10.1016/j.jep.2010.12.007

Gynura segetum is a popular medicinal plant in Indonesia and Malaysia, known to possess various medicinal properties especially for treatment of cancer, diabetes and hypertension.
Anti-angiogenic activity of Morinda citrifolia extracts and its chemical constituents

Beh HK, Seow LJ, Asmawi MZ, Abdul Majid AM, Murugaiyah V, Ismail N, et al.

Nat Prod Res, 2012;26(16):1492-7.
PMID: 22292423 DOI: 10.1080/14786419.2011.562208

Morinda citrifolia L. has been used for the treatment of a wide variety of diseases, including cancer. This study was undertaken to evaluate the anti-angiogenic effect of M. citrifolia fruits and leaves. Anti-angiogenic activity was evaluated in vivo using the chick chorioallantoic membrane assay. Bioactivity-guided fractionation and isolation were performed to identify the active constituent, and high-performance liquid chromatography analysis was then used to quantify the amount of this active constituent in the active extracts and fraction. The methanol extracts of fruits and leaves of M. citrifolia and the subsequent chloroform fraction of the fruit methanolic extract were found to have potential anti-angiogenic activity and were more potent compared to suramin. Scopoletin was identified as one of the chemical constituents that may be partly responsible for the anti-angiogenic activity of M. citrifolia fruits. The present findings further support the use of M. citrifolia in cancer or other pathological conditions related to angiogenesis.
Fulltext Anti-cancer potential of pseuduvaria macrophylla in human cancer cell lines

Taha, H., Mohebali, N., Chung, Y. L., Ismail, N. H., Aziz , A., Bakar, M. Z. A., et al.

Journal of Advanced Research in Applied Sciences and Engineering Technology, 2016;4(1):1-11.
MyJurnal

his is a short report on the recent investigation on the anticancer and antioxidant potential
of Pseuduvaria macrophylla stem bark and leaf extract on human breast cancer cell (MCF-7), human
prostate cancer cell (PC-3) and human colon cancer cell (HT29). LCMS experiment was done to
identify the chemical composition in the methanolic extracts while GCMS analysis was done to
determine the chemical composition in the hexanolic extracts. For antioxidant activity, the most active
extract was leaf methanolic with 69.22 % of DPPH inhibition. Additionally, the leaf methanolic extract
inhibited the better proliferation especially on human breast cancer cell (MCF-7) compared to hexane
crude extracts due to more than 90% of cancer cell death and lowest IC50 value at range of 80.70
µg/mL ± 0.08 – 106.70 µg/mL ± 0.07. The major detected compounds were α-Cadinol, neophytadiene,
palmitic acid, linoleic acid, oleic acid and isopolycerasoidal and isopolycerasoidal methyl ester. The
findings of this study support the anti-cancer claims of Pseuduvaria macrophylla leaf. Copyright© 2016
Penerbit Akademia Baru- All rights reserved.
Fulltext Anti-viral activity of culinary and medicinal mushroom extracts against dengue virus serotype 2: an in-vitro study

Ellan K, Thayan R, Raman J, Hidari KIPJ, Ismail N, Sabaratnam V

BMC Complement Altern Med, 2019 Sep 18;19(1):260.
PMID: 31533688 DOI: 10.1186/s12906-019-2629-y

BACKGROUND: Dengue is a mosquito-borne viral infection that has become a major public health concern worldwide. Presently, there is no specific vaccine or treatment available for dengue viral infection.
METHODS: Lignosus rhinocerotis, Pleurotus giganteus, Hericium erinaceus, Schizophyllum commune and Ganoderma lucidium were selected for evaluation of their in-vitro anti-dengue virus serotype 2 (DENV-2) activities. Hot aqueous extracts (HAEs), ethanol extracts (EEs), hexane soluble extracts (HSEs), ethyl acetate soluble extracts (ESEs) and aqueous soluble extracts (ASEs) were prepared from the selected mushrooms. The cytotoxic effects of the extracts were evaluated by the MTT assay. The anti-DENV-2 activities of the extracts were evaluated in three different assays: simultaneous, attachment and penetration assays were perfomed using plaque reduction assays and RT-qPCR assays. The effect of the addition time on viral replication was assessed by the time of addition assay, and a virucidal assay was carried out to evaluate the direct effect of each mushroom extract on DENV-2. The chemical composition of glucans, and the protein and phenolic acid contents in the extracts were estimated.
RESULTS: We found that the HAEs and ASEs of L. rhinocerotis, P. giganteus, H. erinaceus and S. commune were the least toxic to Vero cells and showed very prominent anti-DENV2 activity. The 50% inhibitory concentration (IC50) values of the ASEs ranged between 399.2-637.9 μg/ml, while for the HAEs the range was 312.9-680.6 μg/ml during simultaneous treatment. Significant anti-dengue activity was also detected in the penetration assay of ASEs (IC50: 226.3-315.4 μg/ml) and HAEs (IC50: 943.1-2080.2 μg/ml). Similarly, we observed a marked reduction in the expression levels of the ENV and NS5 genes in the simultaneous and penetration assays of the ASEs and HAEs. Time-of-addition experiments showed that the highest percent of anti-DENV2 activity was observed when the mushroom extracts were added immediately after virus adsorption. None of the extracts exhibited virucidal effect. Chemical composition analysis showed that the major components in the mushroom HAEs and ASEs were glucan (beta D-glucan) and proteins, however, there was no significant correlation between the anti-dengue activity and the concentration of glucans and proteins.
CONCLUSION: These findings demonstrated the potential of mushroom extracts as anti-dengue therapeutic agents with less toxic effects.
Antibacterial and Antifouling Properties of the Horseshoe Crab Carcinoscorpius rotundicauda

Mohd Faizal MN, Ismail N, M S Eldeen I, Mariam T

Pak J Biol Sci, 2021 Jan;24(5):579-587.
PMID: 34486333 DOI: 10.3923/pjbs.2021.579.587

Background and Objective: Horseshoe crabs are widely used in both traditional and modern pharmaceutical applications. Most of the previous studies on horseshoe crabs focused on their blood which contains hemolymph and amoebocyte lysate. This study aimed to determine the potential antibacterial and antifouling properties of different extracts from the carapace and the book gills of Carcinoscorpius rotundicauda. Materials and Methods: The crude extracts were subjected to the bioactivity tests using the disc-diffusion and the inhibition of biofilm-formation measurement assays, for both the antibacterial and antifouling activities respectively. Results: The results obtained indicated that the carapace extracts had stronger antibacterial and antifouling effects compared to the book gills extracts. Extracts obtained from the male displayed more activity compared to the extracts from the female with a few exceptions. Methanol and acetone carapace crude extracts showed the best overall performance. A sterol compound was isolated from the carapace acetone extracts of the male of C. rotundicauda. However, the compound did not display strong activity compared to the crude extract. The compound might be contributing to the observed activity with other components through a synergistic effect. Conclusion: The presence of antibacterial and antifouling activities in the carapace and book gills extracts could be added to the complexity of the defence mechanisms of horseshoe crabs. The results of this study, therefore, may contribute to the knowledge of the defence mechanisms of C. rotundicauda. Further research is needed to determine the bioactivities of other parts of the animal and to explore their potential applications.
Fulltext Antidiabetic properties of germinated brown rice: a systematic review

Imam MU, Azmi NH, Bhanger MI, Ismail N, Ismail M

Evid Based Complement Alternat Med, 2012;2012:816501.
PMID: 23304216 DOI: 10.1155/2012/816501

Diet is an important variable in the course of type 2 diabetes, which has generated interest in dietary options like germinated brown rice (GBR) for effective management of the disease among rice-consuming populations. In vitro data and animal experiments show that GBR has potentials as a functional diet for managing this disease, and short-term clinical studies indicate encouraging results. Mechanisms for antidiabetic effects of GBR due to bioactive compounds like γ-aminobutyric acid (GABA), γ-oryzanol, dietary fibre, phenolics, vitamins, acylated steryl β-glucoside, and minerals include antihyperglycemia, low insulin index, antioxidative effect, antithrombosis, antihypertensive effect, hypocholesterolemia, and neuroprotective effects. The evidence so far suggests that there may be enormous benefits for diabetics in rice-consuming populations if white rice is replaced with GBR. However, long-term clinical studies are still needed to verify these findings on antidiabetic effects of GBR. Thus, we present a review on the antidiabetic properties of GBR from relevant preclinical and clinical studies, in order to provide detailed information on this subject for researchers to review the potential of GBR in combating this disease.
Antimicrobial and cytotoxic activities of Malaysian endophytes

Ramasamy K, Lim SM, Abu Bakar H, Ismail N, Ismail MS, Ali MF, et al.

Phytother Res, 2010 May;24(5):640-3.
PMID: 19468989 DOI: 10.1002/ptr.2891

Endophytes, which are receiving increasing attention, have been found to be potential sources of bioactive metabolites following the discovery of paclitaxel producing endophytic fungi. In the present study, a total of 348 endophytes were isolated from different parts of 24 Malaysian medicinal plants. Three selected endophytes (HAB10R12, HAB11R3 and HAB21F25) were investigated for their antimicrobial and cytotoxic activities. For antimicrobial activity, HAB10R12 and HAB11R3 were found to be most active against bacteria and fungi, respectively. Their antimicrobial effects were comparable to, if not better than, a number of current commercial antibacterial and antifungal agents. Both HAB10R12 and HAB21F25 were found to be potential anticancer drug candidates, having potent activity against MCF-7 and HCT116 cell lines and warrant further investigation.
Antiulcer activity of methanol extract of Melastoma malabathricum leaves in rats

Zabidi Z, Wan Zainulddin WN, Mamat SS, Shamsahal Din S, Kamisan FH, Yahya F, et al.

Med Princ Pract, 2012;21(5):501-3.
PMID: 22517296 DOI: 10.1159/000337406

To determine the potential antiulcer activity of methanol extract of Melastoma malabathricum leaves (MEMM) using various established rat models.
Fulltext Anxiety-depression psychopathology of a patient with voyeurism, major depression and premature ejaculation

Ismail N, Husain R, Sidi H

ASEAN Journal of Psychiatry, 2017;18(2):278-280.
MyJurnal

Objective: This case report highlights a case of young male referred for psychiatric evaluation due to paraphilic disorder. This 27-year old single male working as an assistant accountant was noted to have voyeuristic behaviour and presented with depressive symptoms since his teenage age. He has poor coping whenever he experiences stress in life. He started to watch pornographic videos and subsequently get involved by peeping pre-pubescent’s undergarments. These activities are followed by a compulsive behaviour such as masturbation to gratify his sexual arousal.
Results: The patient undergone several psychotherapy sessions, and medical report was furnished for the court's purpose. Our assessment revealed that he was suffering from a lifetime major depressive disorder,and he was prescribed with Tablet Sertraline 50mg/daily.He also has premature ejaculation, severe in nature. He regretted his voyeuristic urge and psychotherapyfocused on how to channel his sexual needs.
Conclusion: Mood disorder is seen in paraphilic disorder and has to be dealt with in order to establish good management care.
Apoptosis and cell cycle arrest of human colorectal cancer cell line HT-29 induced by vanillin

Ho K, Yazan LS, Ismail N, Ismail M

Cancer Epidemiol, 2009 Aug;33(2):155-60.
PMID: 19679064 DOI: 10.1016/j.canep.2009.06.003

Vanillin is responsible for the flavor and smell of vanilla, a widely used flavoring agent. Previous studies showed that vanillin could enhance the repair of mutations and thus function as an anti-mutagen. However, its role in cancer, a disease that is closely related to mutation has not yet been fully elucidated.
Application MALDI TOF on protein identification of vitellogenin in giant grouper (Epinephelus lanceolatus)

Om AD, Jasmani S, Ismail N, Yeong SY, Abol-Munafi AB

Fish Physiol Biochem, 2013 Oct;39(5):1277-86.
PMID: 23494207 DOI: 10.1007/s10695-013-9782-x

A new proteomics technology has been implemented to study the protein repertoires of developing oocytes of giant grouper (Epinephelus lanceolatus). Knowledge of the chemical composition and physiochemical properties of vitellogenin (Vtg) is necessary to interpret the functional and biological properties attributed during ovulation. Vtg, as a biomarker indicator in sex determination, has been analyzed to determine the sex and maturational status of fish in the absence of the gonad tissue. A male giant grouper was induced by 2 mg/kg of 17ß-estradiol (E2), and blood was sampled at days 0, 1, 3, 5, and 10. SDS-PAGE 1D electrophoresis was used to analyze Vtg protein, and Vtg identification was done with 4800 Plus MALDI TOF/TOF™ mass spectrophotometer (Applied Biosystems/MDS SCIEX, USA). Meanwhile, MS/MS de novo sequencing identified the proteins by matching sequences of tryptic peptides to the known sequences of other species. Vtg was confirmed by MASCOT at 95% significant level, and molecular mass was 187 kDa. Protein resolved on SDS-PAGE as a double band of approximately the same mass as determined with MALDI-TOF. The N-terminal sequences and identification of Vtg were also determined. The potential of using MS methods to understand the structure and function of Vtg is discussed.
Applying rhizobacteria consortium for the enhancement of Scirpus grossus growth and phytoaccumulation of Fe and Al in pilot constructed wetlands

Ismail N', Abdullah SRS, Idris M, Kurniawan SB, Effendi Halmi MI, Al Sbani NH, et al.

J Environ Manage, 2020 Aug 01;267:110643.
PMID: 32421674 DOI: 10.1016/j.jenvman.2020.110643

Pilot-scale constructed wetlands planted with Scirpus grossus, were used to investigate the effects of applying a three-rhizobacterial consortium (Bacillus cereus strain NII, Bacillus subtilis strain NII and Brevibacterium sp. strain NII) on the growth of S. grossus and also on the accumulation of iron (Fe) and aluminium (Al) in S. grossus. The experiment includes constructed wetlands with the addition of 2% of the consortium rhizobacteria and without the consortium rhizobacteria addition (acting as control). During each sampling day (0, 5, 10, 15, 20, 25, 30, 42, 72 and 102), plant height, concentration of Fe and Al and sand microbial community were investigated. The results for the constructed wetland with the addition of consortium rhizobacteria showed the growth of S. grossus increased significantly at 26% and 29% for plant height and dry weight, respectively. While the accumulation of Fe and Al in S. grossus were enhanced about 48% and 19% respectively. To conclude, the addition of the rhizobacteria consortium has enhanced both the growth of S. grossus and the metal accumulation. These results suggesting that rhizobacteria has good potential to restore Fe and Al contaminated water in general and particularly for mining wastewater.
Aquaculture industry: Supply and demand, best practices, effluent and its current issues and treatment technology

Ahmad A, Sheikh Abdullah SR, Hasan HA, Othman AR, Ismail N'

J Environ Manage, 2021 Jun 01;287:112271.
PMID: 33706093 DOI: 10.1016/j.jenvman.2021.112271

The aquaculture industry has become increasingly important and is rapidly growing in terms of providing a protein food source for human consumption. With the increase in the global population, demand for aquaculture is high and is estimated to reach 62% of the total global production by 2030. In 2018, it was reported that the demand for aquaculture was 46% of the total production, and with the current positive trends, it may be possible to increase tremendously in the coming years. China is still one of the main players in global aquaculture production. Due to high demand, aquaculture production generates large volumes of effluent, posing a great danger to the environment. Aquaculture effluent comprises solid waste and dissolved constituents, including nutrients and contaminants of emerging concern, thereby bringing detrimental impacts such as eutrophication, chemical toxicity, and food insecurity. Waste can be removed through culture systems, constructed wetlands, biofloc, and other treatment technologies. Some methods have the potential to be applied as zero-waste discharge treatment. Thus, this article analyses the supply and demand for aquaculture products, the best practices adopted in the aquaculture industry, effluent characteristics, current issues, and effluent treatment technology.
Assessing feasibility of conducting medication review with follow-up among older adults at community pharmacy: a pilot randomised controlled trial

Christopher CM, Blebil AQ, Bhuvan KC, Alex D, Ibrahim MIM, Ismail N, et al.

Int J Clin Pharm, 2024 Apr 18.
PMID: 38635115 DOI: 10.1007/s11096-024-01711-3

BACKGROUND: Medication review with follow-up is essential for optimising medication utilisation among the older adult population in primary healthcare.
AIM: This study aimed to evaluate the feasibility of implementing medication reviews with follow-up for older adults in community pharmacies and examined potential outcomes on medication use.
METHOD: A pilot randomised controlled trial was conducted with 4 cluster-randomised community pharmacies to assess the feasibility of the intervention. Two community pharmacies served as intervention and control groups. Both groups recruited older adults over 60 who were followed over 6 months. The translated Medication use Questionnaire (MedUseQ) was administered at baseline and 6 months for both groups. The outcomes were to assess the feasibility of conducting medication review with follow-up and the probable medication use outcomes from the intervention.
RESULTS: The intervention and control groups comprised 14 and 13 older adults. A total of 35 recommendations were made by pharmacists in the intervention group and 8 in the control group. MedUseQ was easily administered, providing some evidence the feasibility of the intervention. However, there were feasibility challenges such as a lack of pharmacists, collaborative practice, difficulties with the tool language, time constraints, and limited funds. Questionnaire results provided a signal of improvement in medication administration, adherence, and polypharmacy among intervention participants. The incidence of drug related problems was significantly higher in the control group (median = 1) after 6 months, U = 15, z = - 2.98, p = 0.01.
CONCLUSION: Medication review with follow-up is potentialy practical in community pharmacies, but there are feasibility issues. While these challenges can be addressed, it is essential to study larger sample sizes to establish more robust evidence regarding outcomes.
CLINICAL TRIAL REGISTRY: ClinicalTrials.Gov NCT05297461.
Assessment of arsenic and heavy metal contents in cockles (Anadara granosa) using multivariate statistical techniques

Abbas Alkarkhi FM, Ismail N, Easa AM

J Hazard Mater, 2008 Feb 11;150(3):783-9.
PMID: 17590506

Cockles (Anadara granosa) sample obtained from two rivers in the Penang State of Malaysia were analyzed for the content of arsenic (As) and heavy metals (Cr, Cd, Zn, Cu, Pb, and Hg) using a graphite flame atomic absorption spectrometer (GF-AAS) for Cr, Cd, Zn, Cu, Pb, As and cold vapor atomic absorption spectrometer (CV-AAS) for Hg. The two locations of interest with 20 sampling points of each location were Kuala Juru (Juru River) and Bukit Tambun (Jejawi River). Multivariate statistical techniques such as multivariate analysis of variance (MANOVA) and discriminant analysis (DA) were applied for analyzing the data. MANOVA showed a strong significant difference between the two rivers in term of As and heavy metals contents in cockles. DA gave the best result to identify the relative contribution for all parameters in discriminating (distinguishing) the two rivers. It provided an important data reduction as it used only two parameters (Zn and Cd) affording more than 72% correct assignations. Results indicated that the two rivers were different in terms of As and heavy metal contents in cockle, and the major difference was due to the contribution of Zn and Cd. A positive correlation was found between discriminate functions (DF) and Zn, Cd and Cr, whereas negative correlation was exhibited with other heavy metals. Therefore, DA allowed a reduction in the dimensionality of the data set, delineating a few indicator parameters responsible for large variations in heavy metals and arsenic content. Taking into account of these results, it can be suggested that a continuous monitoring of As and heavy metals in cockles be performed in these two rivers.

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