165 research outputs found
Antimicrobial Activity and Micro-Flora Quality Evaluation of Commonly Used Toothpastes
To determine the microbiological quality and antimicrobial activity and effectiveness of
commonly used toothpaste, thirty products consisting of eight brands of toothpaste were
evaluated using standard methods and Staphylococcus aureus and Candida albicans as test
organisms. All the toothpastes were sterile, and had some levels of antimicrobial activity at neat
and 10-1 dilutions. Colgate and Signal had the highest zones of inhibition 20mm and 12mm
against Staphylococcus aureus. Colgate and Macleans herbal neat concentration had the highest
inhibition of 11mm and 10mm on Candida albicans. Colgate and Macleans had a minimum
inhibitory concentration greater than 10-3 for Staphylococcus aureus. The other toothpastes
showed minimum inhibitory concentration of 10-1 and 10-2. Close Up herbal and Colgate had
minimum inhibitory concentrations of greater than 10-3 for Candida albicans. At 10-2 dilution,
total bacteria count of colonies increased as the time of exposure increased for most of the
toothpastes. There was however, a general decline in the number of Candida colonies as the time
of exposure increased. The toothpastes reduced and inhibited the test organisms mainly as neat
and at 5 and 10 minutes. It is advocated that brushing the teeth for 5 to 10 minutes will allow for
enough contact time for toothpaste to act on oral microbes and importantly pathogens for
maximum result of good oral hygiene. Further studies on the relationship of brushing mannerism
and toothpaste use culture are necessary. Regular survey of personal care products at the
consumer level is advised to help keep the consumers informed of quality of products and checkmate producers of fake product and thus help stamp out unwholesome product from our
market
Haematological Response of Clarias Gariepinus to Rubber Processing Effluent
Industrialization has led to huge waste generation over the last decades, the absence of
adequate facilities for treating such wastes in most developing nations has led to the
discharge of effluents into the environment without proper treatment. Toxicological effects
of effluents from rubber processing plant (collected during the period of low rivertide i.e.
between October 2012 and February 2013) were carried out in this study. Lethal
concentration (96-h LC50) was evaluated using 0.25mg/L, 0.30mg/L, 0.35mg/L and
0.40mg/L while sub-lethal effects (42 days) was carried out on haematological parameters
like Red Blood Cell (RBC), White Blood Cell (WBC), Haemoglobin (Hb), Packed Cell
Volume (PCV), Mean Corpuscular Volume (MCV), Mean Corpuscular Haemoglobin (MCH)
and Mean Corpuscular Haemoglobin Concentration (MCHC) using 0.064mg/L, 0.048mg/L,
0.032mg/L and 0.016mg/L which are the 20%, 15%, 10% and 5% of the 96-h LC50 value.
Mortality increased as the concentrations of the effluent increases and 0.32mg/L was
obtained as LC50. In comparison with the control, the mean value obtained for PCV, HB
and RBC showed significant differences (P<0.05) most especially at highest concentration
while there was no significant difference in all values obtained for WBC, MCV, MCH and
MCHC. It was concluded that the rubber processing effluent had some negative effect on
the haematology of Clarias gariepinus. Therefore, it is recommended that the effluent
should be properly treated before discharge into the environme
Co-digestion of Food Waste and Human Excreta for Biogas Production
The ever increasing cost of fossil fuels and its attendant pollution menace has provided
the pedigree to consider alternative sources of energy. An investigation was launched into
the design and construction of an Anaerobic Digester system from locally available raw
materials using local technology and the production of biogas from food wastes and
Human excreta generated within a University campus. The experiment lasted for 60 days
using a 40-liters laboratory scale anaerobic digester. The volume of gas generated from
the mixture was 84,750cm3 and comprised of 58% CH4, 24% CO2, and 19% H2S and
other impurities. The physico-chemistry of the feedstock in the digester revealed an initial
drop in pH to more acidic range and a steady increase 4.52 – 6.10. The temperature
remained relatively constant at mesophilic range: 22.0ºC– 30.5ºC throughout the study.
The Carbon/Nitrogen (C/N) ratio of the feedstock before digestion was within 139:1.
Population distributions of the microflora show aerobic and anaerobic bacteria to include
Klebsiella spp, Bacillus spp, Escherichia coli, Clostridium spp and a methanogen of the
genera Methanococcus. In most developing nations of Sub-Saharan Africa where
biomass is abundant, and where biogas technology is in its infant stage, the anaerobic
digestion system could be the much awaited solution
Acute toxicity of synyhetic resin effluent to African Catfish, Clarias gariepinus [BURCHELL, 1822].
Aquatic pollution as a field has gained a lot of attention over the decades majorly because of the vital role the aquatic environment plays in the human lifecycle. Indusrial wastewaters are often generated and discharged into the environment without treatment. Toxicity of effluents from Synythetic Resin production plant were evaluated in this study. Acute toxicity (96-h LC50) was evaluated using 0.23, 0.31, 0.35 and 0.39 mg/L of the effluent in a renewal bioassay procedure. Physicochemical parameters of the effluent were also evaluated, the values obtained for lead, cyanide, total suspened solid, total hadness, total dissolved solids and alkalinity were higher than the Federal Environmental Protection Agency standard specification for effluent discharge into aquatic environment and as such contributed to the effluent's toxicity. Mortality increased as the concentrations of the effluent increases and 0.355mg/L was obtained as LC50. The research eventually revealed that the synthetic resin effluent has a high level of toxicity to catfish. Deleterious effects such as biomagnification and other abberations may occur in man if exposed to substantial concentration of the effluent
Mycoflora and Aflatoxin Contamination of Some Foodstuffs
Analysis was made of the mycoflora and aflatoxin contamination of Rice (Oryza sativa),
Beans (Phaseolus vulgaris), Corn (Zea mays), and Groundnut (Arachis hypogaea) sold in
four different markets in Sango-Ota, Ogun state, Nigeria. Sixty four samples comprising of
four samples of each foodstuff from four food vendors in four different markets was assayed.
The samples were contaminated with different species of fungi to include Aspergillus flavus,
Aspergillus tamarii, Aspergillus niger, Rhizopus nigricans, Rhizopus oryzae, Saccharomyces
cerevisiae, Aspergillus parasiticus, Fusarium moniliforme, Fusarium verticilliodes,
Aspergillus ochraceus, Cladosporium cladosporioide, Mucor spp, Trichodema spp, Rhizopus
arrhizus and Aspergillus fumigates. Aspergillus flavus and Fusarium spp had the highest rate
of occurrence among the isolated fungi. Aflatoxins B1, B2, G1 and G2 were found associated
with the samples at concentration ranging from 9 - 25 ppb, 8 - 12 ppb, 6 - 21 ppb, 4 - 8 ppb
respectively. The fungal counts were between 6.3 x 102 to 7.0 x 103 cfu/g. The moisture
content and the pH of samples were between 10.9 to 28.0% and 6.20 to 6.66 respectively.
Effective storage and adherence to HACCP principles will help prevent contamination of
foodstuffs with aflatoxigenic fungi
Microbiological safety evaluation of street vended ready-to-eat fruits sold in Ota, Ogun state, Nigeria.
Microbiological safety evaluation of street vended ready to eat fruits was conducted in two vending sites, a local market and a University cafeteria. The mean total aerobic plate count ranges from 2.0x106 to 8.2x108 on Pineapple and Watermelon obtained from the local market and from 6.0x104 to 2.7x107 on apple and fruit salads from the University cafeteria. All the samples were contaminated with coliform and fungi with counts ranging from 2.2x105 to 4.2x106 and 2.0x101 to 1.0x103 in the samples from the cafeteria, and 2.0x105 to 3.5x106 and 2.0x102 to 1.1x103 for samples from the local market. Organisms identified include Bacillus spp 100%, S. aureus and Penicillium spp 80%, Aspergillus niger 60%, E. coli, Enterobacter, Salmonella, Klebsiella, Mucor spp 40%, Pseudomonas aeruginosa, Proteus, Micrococcus, and Lactobacillus spp 20%. The presence of coliform, and counts of ≥ 106 in most of the samples is a reflection of the sanitary quality of the processing of the produce and calls for concern. Adequate training of food vendors to maintain high standard of personal and environmental hygiene, proper washing of fruits before consumption, regular washing of hands and effective application of hazard analysis critical control point (HACCP) will help control contamination of products
Assessment of Microbial Quality and Antibacterial Activity of Commonly used Hand Washes
Hands are the highways to the transmission and spread of pathogens that causes
diseases, food borne illnesses and nosocomial infections. Hand washing is the act
of cleansing the hands with water or another liquid, with or without the use of
soap or other detergents, to ensure proper hand hygiene. To determine the
microbiological quality and the antibacterial property and dilution effects on
activity of hand wash, seven brands of hand washes were evaluated using
susceptibility test by agar well diffusion, minimum inhibitory dilution and time kill
test. This was done by assessing different dilutions of the hand washes against
standardized 1.5x108 cells of Staphylococcus aureus, Escherichia coli and
Pseudomonas aeruginosa. Results showed that all the hand washes were sterile
and all the brands had some level of antibacterial activity. The hand washes were
more active on Staphylococcus aureus and Escherichia coli than on Pseudomonas
aeruginosa. Activity decreased with dilution as neat and 2-1 dilutions gave better
results compared to 2-2, 10-1 and 10-2. Hib hand wash killed all test organisms when
exposed for 2, 5 and 10 minutes and at neat and 2-1 dilutions but not at 2-2, 10-1 and
10-2. Rev and Pan hand washes though are sterile, were least active in all the tests.
The minimum inhibitory dilution and minimum bactericidal dilution for most of the
hand wash was at neat concentration. The time kill test showed that the effect of
the hand wash was highest at 5 and 10 minutes and at neat (undiluted) for all the
test organisms. It is advised that the dilution of hand washes a common practice in
most eateries must stop as these products are not active when diluted, hands
should be washed for five to ten minutes for maximum hand hygiene.
Key words: Antibacterial Activity, Food Borne Illnesses, Hand Hygiene,
Microbiological Quality, Nosocomial Infections and Pathogens
Assessment of Occupational Diseases among Artisans and Factory Workers in Ifo, Nigeria
The ever increasing incidences of occupational diseases among workers have continually
drawn the attention of researchers towards ameliorating the situation. Investigation was
launched to assess occupational diseases among artisans and factory workers in Ifo,
Nigeria. Structured questionnaires with oral interview were employed to complement the
health records of the respondents at the Government accredited health center. Of the one
hundred and fifty six (156) respondents, ninety six (62%) are males and sixty one (38%)
female, sixty one point fifty four percent (61.54%) are youths of age 20 to 39 years, fifty
one (32.69%) are illiterates and one hundred and eight (69.21%) earn N100, 000 ($615)
and below as monthly wages. The diseases prevalent in these workers were evaluated to
include but not limited to disorders of muscles, bones, joints, skin and the respiratory
organs indicating that most of the jobs are such that causes damages to these special
parts of the body and could lead to deformities/incapacitation in old age. Common
amongst these diseases are Pre-patellar bursitis and Eczema (1.92% each),
Tuberculosis, Asthma and Sunburn (5.77% each). Toxic/inflammatory syndrome, hearing
impairment, allergies and computer vision syndrome (7.69% each). Two (1.28% in each
case) have been diagnosed of Lead poisoning, Lung cancer, Carpal tunnel syndrome,
Pulmonary fibrosis, Meniscus lesion and Olecranon bursitis. Upper airway disorders (4.49%), Irritations (3.21%), Post-traumatic stress syndrome (11.54%), skin allergies
(13.46%). Chronic bronchitis; Pneumonia; Pneumoconiosis; Hepatitis and Anthrax-like
infection (0.64 % each). The causes of these diseases/disorders include dusts from
quarry, textile, cotton, metal, paper, mineral, wood, cereals, cement, and chemical fumes
industries, extreme posture of wrist, repetitive movements, inhalations from petrol fuel,
prolonged pressure of the elbow region, prolonged kneeling/ squatting position, forceful
exertions and microorganisms. Adequate occupational health and safety awareness
through training and campaign should be provided. The use of personal protective
equipment among workers should also be encouraged
Differential bioaccumulation of heavy metals in selected biomarkers of Clarias gariepinus (Burchell, 1822) exposed to chemical additives effluent
The toxicity of Sublethal concentrations of chemical additives effluents were investigated on African
catfish Clarias gariepinus using a renewable static bioassay. The trend of bioconcentration of metals in
the gut, liver, gills and kidney of the test organisms differs significantly (p < 0.05) and it followed the order,
liver> gill >gut > muscle. The result revealed that the liver had Ni concentration of 0.0046 mg/L and 16.1208
mg/L of magnesium as the highest. In the muscle, Ni was not bioaccumulated (0.0000 mg/L) while the
highest magnesium concentration of 10.7345 mg/L was recorded. The gill had the least concentration of
0.0010 mg/L for Cu while the highest concentration recorded for Mg was 12.6797 mg/L. The gut had Mn
concentration of 0.0401 mg/L and Mg concentration of 14.5001mg/L. It was revealed that fish can
bioaccumulate heavy metals from a polluted environment, which may result in reduction or impairment of
natural population size and could be a risk to consumers. Consumption of fish from polluted environment
should be discouraged
Bioaccumulation Pattern of Cadmium and Lead in the Head Capsule and Body Muscle of Clarias gariepinus [Burchell, 1822] Exposed to Paint Emulsion Effluent
The toxicity of Sub-lethal concentrations of effluents from a paint emulsion industry were
investigated on African catfish Clarias gariepinus in order to determine the bioaccumulation pattern of two
heavy metals i.e., Lead and Cadmium in the Head capsule and Body muscle using a renewable static bioassay.
The trend of bioconcentration of metals in the head capsule and muscle of the test organisms differs
significantly (phead capsule. In the muscle, the highest
bioaccumulation of lead was 0.4680 mg/L while the least was 0.0660 mg/L. Cadmium bioaccumulation in the
head had the highest value to be 2.0424 mg/L while the lowest value was 0.0101 mg/L. In the head capsule on
the other hand, the highest accumulation of lead was found to be 0.3918 mg/L while its lowest value was
0.1677 mg/L. The highest value for cadmium in the head capsule was 2.0249 mg/L while its lowest was 0.0058
mg/L. It was revealed in the study that fish can bioaccumulate heavy metals from a polluted environment,
which often result in reduction or impairment of natural population size and could be a veritable source of these
metals to man. Therefore corrective measures should be taken to avoid pollution of this sort in the environment
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