Research Papers/Topics in Biological Science

A Discussion on Microcystis Aeruginosa as a Disturbance Indicator of Water Quality

TABLE OF CONTENT An Indicator Species & Identification Description of Microcystis aeruginosa Ecological Characteristics, Evolutionary Strategies & Ecological Class What Makes Microcystis aeruginosa an Indicator of Disturbance  Successional Status Agents that Promote Microcystis aeruginosa Usefulness offs an Indicator References  References

The Relationship Between the Abundance of Alien Invasive Semimytilus Algosus on the Abundance of Native Perna perna Along the Intertidal Zone of Dolphin Beach

Table of ContentIntroduction Objectives Study design Data collection Results Discussion Conclusion ReferencesIntroduction Alien invasive species are introduced accidentally or intentionally outside of their natural geographic range & become problematic. Semimytilus algosus spreads from the point of introduction, rapidly colonising & establishing populations on the rocky shore, disrupting native perna perna species (Alexander et al. 2015)Semimytilus...

Interferometric Analysis Of Cellophane Sheet For Broad Band Application In Phase Retardation

ABSTRACTThe analysis of cellophane sheet as a phase retarder is reported. Several cellophane sheets were tested for birefringence and compared with a purpose built half wave plate (HWP). A Mach-Zehnder interferometer was used to generate interference patterns when the cellophane sheet was half-way mounted on one arm of the interferometer. Analysis of the interferograms revealed a clear phase shift which was calculated to be 0.98π. The fast axis was determined to be along the length of the ce...

Calcium Chloride Supported On Purified Spent Bleaching Earth As Potential Adsorptive Material For Air Dehumidification Application

ABSTRACTThe cosmic limitation of high humid environment in tropic regions spurs a lot of interest to the development of low cost desiccants. Calcium chloride has been indicated as the oldest adsorbent desiccant among chemicals and gas dehydration industries. However, calcium chloride dissolution behaviour makes it difficult to be utilized well as desiccant. The first attempt to suppress deliquescence behavior for dehumidification purpose was in 1976 where silt loam was used as the host materi...

Effects Of Biochar And Compost On Soil Physicochemical Properties And Maize Yield In Acidic Ferralsol In Kamiti Sub-Catchment, Kiambu County, Kenya

ABSTRACTThe rapidly increasing global population, climate change and dwindling resources have made it very difficult to meet global food demand. To address the issue of food insecurity, sustainable intensification of agriculture (SIA) has been proposed. However, the consequences of poorly managed agricultural intensification can negatively affect the ecosystem. Biochar and compost application has been widely recommended as a highly promising soil fertility replenishment option to promote sust...

Application Of Mass Transport Model To Study Temporal Variation Of Concentration Of Lead In A Riverine System

ABSTRACTHeavy metal contamination within river systems is a major environmental problem around the world. An environmental model was developed to simulate the temporal variation of concentration of lead discharged into a riverine system. The model was developed by solving the transport equation which governs the concentration of lead. The equation has advection, dispersion, sink and source terms. The equation was discretised and converted into a language compatible with a computer. A computer...

Mechanical, Diffusion And Degradation Behaviour Of Polypropylene And Cellulose Blends

ABSTRACTPolypropylene is one of the most important commodity polymers and is used in many areas. Its applications are often limited due to its low impact strength, Young‟s modulus properties and non-biodegradability nature. Blending polypropylene with different polymers is an economic and effective way to improve these drawbacks. Polypropylene/wood flour blends have undesirable properties; they have weak structural rigidity, very low thermal stability and high diffusivity. Cellulose is line...

Evaluation Of Antimicrobial Activity Of Some Plants Used By Traditional Healers For Treatment Of Microbial Infections In Kakamega District: Kenya

Abstract Resistance to drugs especially antibiotics has become a major challenge facing the medical fraternity today. Most antibiotics that were once effective against pathogenic micro-organisms have now been rendered ineffective owing to resistance developed by these pathogens. This scenario has been complicated by the emergence of HIV/AIDS, which renders the victims immuno-compromised, and open to opportunistic infections. At the same time, most of the African population lives below the pov...

Accessibility and Use of Family Planning Information (FPI) by Rural People in Kilombero District, Tanzania

Abstract This study investigated the accessibility and use of family planning information (FPI) by rural people in Kilombero District, Tanzania. The purpose was to examine the entire infrastructure required for accessing and using FPI in a rural setting. The study surveyed 120 respondents using questionnaire, interview protocols and observation guides. The respondents included women and men of reproductive age, and Maternal and Child Health (MCH) clinic staff. The study revealed th...

Biological Assessment Of Tropical Riverine Systems Using Aquatic Macroinvertebrates In Tanzania, East Africa.

In Tanzania, and in East Africa in general, bioassessment methods for monitoring and assessing riverine ecosystems are not yet in place. This thesis describes the development of a macroinvertebrate-based bioassessment method for assessing the degree of anthropogenic disturbance in Tanzanian rivers. The hypotheses that, ‘macroinvertebrate assemblages reflect disturbance in river systems’; ‘rivers with similar abiotic features have similar macroinvertebrate assemblages’; and ‘spat...

Potability Of Borehole, Bottled, And Municipal Water In Harare

ABSTRACTHuman health depends on reliable access to safe drinking water, but in many developing countries there are problems of accessing it. This is mainly attributed to water pollution, poor infrastructure for potable water treatment and unhygienic practices in water bottling companies. This study was carried out to assess the physico-chemical and microbiological quality of borehole, bottled and municipal water in Harare (Zimbabwe), by evaluating the compliance of each water type with WHO st...

A Preliminary Evaluation Of Chloro-Nicotinyl Aphicides As Planting-Hole Treatments Against The Tobacco Aphid Myzus Persicae Nicotianae.

AbstractA field trial was done to examine the efficacy of chloro-nicotinyl aphicides applied as soil applications, and to determine the optimum rate for fipronil, acetamiprid and calypso for control of the tobacco aphid Myzus persicae. The tobacco variety KRK26 was used in this experiment. The plants were initially exposed to natural infestation by the tobacco aphid. At eight weeks after planting (WAP) the plants were artificially infested with cultured aphids after an ass...

Cockroaches As Vectors Of Bacteria In Hospital Environments

ABSTRACTCockroaches have become one of the most common pests due to their wide distribution in human dwellings, kitchens, food outlets and the hospital. In hospitals their wide abundancy may be related to poor sanitary conditions, plenty of food sources, environments which are unhygienic and moist shady places. This study was carried out to evaluate the microbial fauna of cockroaches in a hospital environment as proxy to Health acquired infections. Two different species of cockroaches Peripla...

An Investigation On The Effects Of Tenolam On Kidney Function In Hiv Positive Patients

ABSTRACTThe study was carried out to determine the effect of Tenolam drug on kidney function in HIV positive patients at Nkayi District Hospital. The study was done from June 2016 to October 2016. This was done by analysing the change in urine protein concentration after the patients were given the drug. A total of thirty individuals were recruited in the study, fifteen females and fifteen males. Age, gender and CD4 counts of the patients were recorded before tenolam administration. Each pati...

Prevalence And Antibiotic Susceptibility Patterns Of Pseudomonas Aeruginosa In Clinical Isolates: A Case Study Of Bulawayo Metropolitan Province.

ABSTRACTPseudomonas aeruginosa is gram negative bacterium which causes nosocomial infections in patients and is highly resistant to most antibiotics as it possess numerous mechanisms of resistance. These mechanisms possessed by P. aeruginosa make it difficult to treat in infections thus being of medical concern. A study was carried out to determine the prevalence and antibiotic susceptibility patterns of P. aeruginosa isolated from wound pus and urine samples. A total of 1200 primary cultured...


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