36 research outputs found
Sexual networking, STDs and HIV/AIDS in four urban gaols in Nigeria
Truck drivers, female hawkers and prostitutes are generally regarded as high-risk groups because they have a high rate of partner change, run abnormally high risks of being infected with sexually transmitted diseases (STDs) including HIV/AIDS, and are capable of transmitting them to the general population who live around them (Orubuloye, Caldwell and Caldwell 1993; Orubuloye 1995). Recent experience has shown that the prison population runs a high risk of being engulfed by AIDS. By late 1992, HIV-positive prisoners had been detected in at least one of the prisons in Nigeria and there was beginning to be concern for the safety of the prison population. Therefore a study of the prison population was planned as part of a larger continuing research program of the Ondo State University, Ado-Ekiti, Nigeria, on Sexual Networking, STDs and HIV/AIDS Transmission, supported by a grant from the Swedish Agency for Research Cooperation with Developing Countries (SAREC). The aim of the prison study was to investigate the attitudes and activities that are likely to facilitate the spread of sexually transmitted diseases, HIV and AIDS; and to develop an intervention program for the prison population and any population that may be in a similar situation
Effects of Na2Cr2O7 Inhibitor on the Corrosion Potential Response of Steel Reinforced Concrete in Saline Medium
Electrochemical monitoring method of the open circuit potential was used to investigate the effect of
the concentrations of Na2Cr2O7 on the corrosion potential response of steel reinforced concrete in
sodium chloride medium. In the study, five different concentrations of Na2Cr2O7 admixtures were
employed in a system of replicated samples of steel-reinforced concrete specimens partially
immersed in 3.5% NaCl to simulate marine and saline environments. Forty days measured responses
from these were subjected to the statistical analyses of the Normal and the Weibull distribution
functions and tested using the Kolmogorov-Smirnov goodness of fit criteria. Results obtained from the
analyses identified 4 g Na2Cr2O7 with optimal averaged potential response inhibition performance by
the Normal model which showed better agreements in its models of Na2Cr2O7 potential test data than
that obtained from the Weibull model of the same data. These bear pertinent implications on the need
for suitability studies of appropriate statistical distribution for studying performance of corrosion
inhibitors even as suggestions were proffered for addressing results conflicts among replicates of
steel reinforced concrete samples employed
METHODS OF ASTM G16 AND CONFLICTS IN CORROSION TEST DATA: CASE STUDY OF NANO2 EFFECTIVENESS ON STEEL-REBAR CORROSION
In this paper, applications of the methods of ASTM G16 for addressing inherent conflicts in laboratory measurements of
corrosion test data were studied, using the inhibiting effect of NaNO2 on the corrosion of concrete steel-rebar for the case
study. For this, electrochemical monitoring techniques were employed for studying effectiveness of different
concentrations of NaNO2 admixture in replicated concrete samples immersed in NaCl and in H2SO4 media for an
experimental period of sixty-eight days. The corrosion test data from this experimental setup were subjected to the
probability density fittings of the Normal and the Weibull functions as well as to significance testing methods of ASTM
G16-99 R04 specifications. Results identified 10g (0.1208M) NaNO2 admixture with optimal inhibition efficiency
model, η = 88.38±4.62%, in the saline/marine simulating environment and the 8 g (0.0966M) NaNO2 admixture with
optimum effectiveness, η = 13.51±83.48%, in the acidic environment. The techniques of ASTM G16 adequately
identified and addressed conflicting effectiveness from the test data of NaNO2 admixtures in the studied test
environments
Effectiveness of Treatment Outcomes of Public Private Mix Tuberculosis Control Program in Eastern Nigeria
Effective tuberculosis treatment has been shown to have significant effect on the control of tuberculosis. Completion of treatment of active cases is therefore the most important priority of tuberculosis control programmes. Descriptive statistics with a retrospective cohort study design used to analyze secondary data set (2007-2010) of patients accessing TB-DOTS treatment in two facilities (Nnamdi Azikiwe University Teaching Hospital, NAUTH and Department of Health Services Tuberculosis and Leprosy Control Unit Nnewi North Local Government Area (L.G.A.) Secretariat, DHSTLCU ) as public health facilities and other two facilities ( Immaculate Heart of Catholic Church Hospital, IHCCH and Diocesan Anglican Communion Hospital, DACH) as private health facilities in Nnewi North L.G.A., Anambra State. Gender of patients were male: female 54%(1016 patients) : 46% (883 patients) and 53%(63 patients) : 47%(56 patients) in public and private health facilities respectively . Using WHO (1996) standards the health facilities adjudged as efficient were: in 2007, private facilities using the indicator of treatment failure rate; private facilities using the indicator of death rate; public facilities and private facilities using the indicator of transfer-out rate ; public facilities using the indicator of treatment completion rate. In 2008, effective health facilities were: private health facilities using the indicator of failure rate; public and private health facilities using the indicator of transfer-out rate; private facilities using the indicator of treatment completion rate. In 2009, effective health facilities were public and private health facilities using indicator of treatment failure rate; public and private health facilities using the indicator of death rate; public and private facilities using the indicator of transfer out; public and private facilities using the indicator of treatment completion rate. In 2010, effective health facilities were: private health facilities using the indicator of cure rate; private facilities using the indicator of death rate ; public and private facilities using the indicator of transfer-out; public facilities using the indicator of treatment completion rate. In conclusion, private health facilities were more effective than public health facilities by the several indicators over the four year period. Future research is needful to use primary and secondary data sets in assessment of TB control program effectiveness; technical efficiency assessment using non-parametric statistics will assess the validity of assessing effectiveness using only the WHO standards; identify centre-specific factors associated with poor treatment outcome; institutionalizing a reward system for effective TB-DOTS facilities will engender healthy competition in the Public Private Mix for sustained effectiveness; the Monitoring and Evaluation tools especially the treatment card for data capture should be improved upon for comprehensiveness of patients socio-economic history. Keywords: Tuberculosis, Effectiveness, Treatments Outcomes, Public Private Mi
Nanochitosan derived from marine bacteria
Nanochitosans are polysaccharides produced by the alkalescent
deacetylation of chitin and comprise a series of 2-deoxy-2
(acetylamino) glucose linked by Ă-(1-4) glycosidic linkages. These are
naturally formed from the deacetylation of shellfish shells and the
exoskeleton of aquatic arthropods and crustaceans. Reports of
chitosan production from unicellular marine bacteria inhabiting the
sea, and possessing distinct animal- and plant-like characteristics
abound. This capacity to synthesize chitosan from chitin arises from
response to stress under extreme environmental conditions, as a
means of survival. Consequently, the microencapsulation of these
nanocarriers results in new and improved chitosan nanoparticles,
nanochitosan. This nontoxic bioactive material which can serve as an
antibacterial agent, gene delivery vector as well as carrier for protein
and drug release as compared with chitosan, is limited by its
nonspecific molecular weight and higher composition of deacetylated
chitin. This chapter highlights the biology and diversity of
nanochitosan-producing marine bacteria, including the factors
influencing their activities, survival, and distribution. More so, the
applications of marine bacterial nanochitosans in transfection and
gene delivery; wound healing and drug delivery; feed supplement
development and antimicrobial activity are discussed
Next Generation Nanochitosan Applications in Animal Husbandry, Aquaculture and Food Conservation
Studies have identified the properties of enzymes, functionalized
molecules, and compounds in food industry applications as edible
coatings and encapsulations, that assure prolonged food quality and
standards. These molecules present benefits of longer shelf-life by
delayed deterioration and inhibition of the proliferation of spoilage and
mycotoxigenic microorganisms. However, challenges of reduced
nutrient levels, miniaturized size, and low chemical stability remain
concerning. Chitosan polymers naturally formed from the
deacetylation of shellfish shells and exoskeletons of aquatic
arthropods and crustaceans offer improved benefits when
functionalized into nanoparticles as nanochitosans. These
polysaccharides produced by the alkalescent deacetylation of chitin,
comprise a series of 2-deoxy-2 (acetylamino) glucose linked by Ă-(1-
4) glycosidic linkages. This chapter considers the health impacts and
microbiological health hazards associated with animal feeds quality
and the enzyme immobilization potentials of nanochitosans in animalbased
food and feed packages. Thereafter, nanochitosan properties
and benefits are compared against traditional preservatives from
microbes and plants; with highlights on current challenges in the
application of nanochitosan for enzyme immobilization
Chapter 21 - Utilization of nanochitosan in the sterilization of ponds and water treatment for aquaculture
Water pollution constitutes the leading cause of infant mortality,
neonatal deformities, and shrinkage of manâs average life expectancy.
Pollutants come from point and nonpoint sources; and water pollution
arises from the discharge of wastewater containing undesirable
impurities used for domestic, agricultural, and industrial purposes.
More so, high nutrient and wastewater runoffs from fish production
systems contribute to the fouling and eutrophication of recipient water
bodies. Hence, aquaculture which is inextricably linked to the natural
environment is challenged by the dearth of appropriate water quantity
and quality, militating against fish, and fishery production.
Nanochitosans as polysaccharides produced by the alkalescent
deacetylation of chitin, comprise a series of 2-deoxy-2 (acetylamino)
glucose linked by Ă-(1-4) glycosidic linkages. They are naturally
formed from the deacetylation of shellfish shells and exoskeletons of
aquatic arthropods and crustaceans. The unique attributes of chitin
confer a wide range of biotechnological applications on the polymer,
observed in flocculation as a wastewater treatment and purification
route initiated by chitosan. This chapter highlights nanochitosan properties of aquaculture relevance; and elucidates the purification
potentials of nanochitosan, compared to inorganic coagulants and
organic polymeric flocculants. Effects of chitosan on contaminants and
microorganisms, as well as applications in fish pathogens detection,
fish disease diagnosis, and control are discussed
Utilization of nanochitosan in the sterilization of ponds and water treatment for aquaculture
Water pollution constitutes the leading cause of infant mortality,
neonatal deformities, and shrinkage of manâs average life expectancy.
Pollutants come from point and nonpoint sources; and water pollution
arises from the discharge of wastewater containing undesirable
impurities used for domestic, agricultural, and industrial purposes.
More so, high nutrient and wastewater runoffs from fish production
systems contribute to the fouling and eutrophication of recipient water
bodies. Hence, aquaculture which is inextricably linked to the natural
environment is challenged by the dearth of appropriate water quantity
and quality, militating against fish, and fishery production.
Nanochitosans as polysaccharides produced by the alkalescent
deacetylation of chitin, comprise a series of 2-deoxy-2 (acetylamino)
glucose linked by Ă-(1-4) glycosidic linkages. They are naturally
formed from the deacetylation of shellfish shells and exoskeletons of
aquatic arthropods and crustaceans. The unique attributes of chitin
confer a wide range of biotechnological applications on the polymer,
observed in flocculation as a wastewater treatment and purification
route initiated by chitosan. This chapter highlights nanochitosan
properties of aquaculture relevance; and elucidates the purification
potentials of nanochitosan, compared to inorganic coagulants and
organic polymeric flocculants. Effects of chitosan on contaminants and
microorganisms, as well as applications in fish pathogens detection,
fish disease diagnosis, and control are discussed
Utilization of nanochitosan for enzyme immobilization of aquatic and animal-based food packages
Studies have identified the properties of enzymes, functionalized molecules, and compounds in food industry applications as edible coatings and encapsulations, that assure prolonged food quality and standards. These molecules present benefits of longer shelf-life by delayed deterioration and inhibition of the proliferation of spoilage and mycotoxigenic microorganisms. However, challenges of reduced nutrient levels, miniaturized size, and low chemical stability remain concerning. Chitosan polymers naturally formed from the deacetylation of shellfish shells and exoskeletons of aquatic arthropods and crustaceans offer improved benefits when functionalized into nanoparticles as nanochitosans. These polysaccharides produced by the alkalescent deacetylation of chitin, comprise a series of 2-deoxy-2 (acetylamino) glucose linked by Ă-(1-4) glycosidic linkages. This chapter considers the health impacts and
Nanochitosan derived from marine bacteria
Nanochitosans are polysaccharides produced by the alkalescent deacetylation of chitin and comprise
a series of 2âdeoxyâ2 (acetylamino) glucose linked by Ăâ(1â4) glycosidic linkages. These are naturally
formed from the deacetylation of shellfish shells and the exoskeleton of aquatic arthropods and
crustaceans. Reports of chitosan production from unicellular marine bacteria inhabiting the sea, and
possessing distinct animalâ and plantâlike characteristics abound. This capacity to synthesize chitosan
from chitin arises from response to stress under extreme environmental conditions, as a means of
survival. Consequently, the microencapsulation of these nanocarriers results in new and improved
chitosan nanoparticles, nanochitosan. This nontoxic bioactive material which can serve as an
antibacterial agent, gene delivery vector as well as carrier for protein and drug release as compared
with chitosan, is limited by its nonspecific molecular weight and higher composition of deacetylated
chitin. This chapter highlights the biology and diversity of nanochitosanâproducing marine bacteria,
including the factors influencing their activities, survival, and distribution. More so, the applications
of marine bacterial nanochitosans in transfection and gene delivery; wound healing and drug
delivery; feed supplement development and antimicrobial activity are discussed