Natural & Applied Sciences

Natural & Applied Sciences Research Papers/Topics

Effects Of Consolidation Parameters On Mechanical Properties And Thermal Degradation Of Self Reinforced High Density Polyethylene Composite

ABSTRACT The numerous applications of high density polyethylene (HDPE) in industries for production of domestic and commercial commodities have made it necessary to find ways of improving its mechanical properties. The most common way of doing this is to add reinforcement such as glass fibers. However these composites suffer limitations due to reduced recyclability, great weight and difficult to thermo-form. In order to improve properties such as specific strength, stiffness and thermo-formab...

Amoebiasis levels in relation to sanitation and personal hygiene among patients attending Kauwi and Muthale hospitals in Kitui county, Kenya

ABSTRACT Entamoeba histolytica, an intestinal protozoan parasite, is the causative agent for amoebiasis which is the third leading parasitic disease causing deaths in humans after malaria and schistosomiasis. Globally, it is responsible for 40,000 to 100,000 deaths annually. Amoebiasis is on the rise in Kitui County and is responsible for diarrheal illnesses and early deaths in children under 5 years. There is no surveillance system in Kenya to combat the disease and its real level of occurre...

Genetic Diversity Of Faidherbia Albida (Del.) A. Chev Collections Held At The World Agroforestry Centre (Icraf) Nairobi, Kenya

ABSTRACT Faidherbia albida (Del.) A. Chev is a tree species native to Africa and the Middle East. It is an important agro-silvo pastural species owing to its morphological and physiological dynamics that mediate improvement of soil structure and fertility while offering several other benefits to farmers and the environment. Key among these is its reverse phenology, a phenomenon that allows the tree to compete minimally with crops while providing a favorable microclimate for their growth. It ...

Simulating Natural Turbulent Convection Fluid Flow In An Enclosure Using The Two-Equation Turbulent Models

  ABSTRACT This study assesses the performance of three numerical turbulence models; k -e , k -w and k -w - SST in predicting heat transfer due to natural convection inside an air filled cavity. The heat transfer due to natural convection inside a rectangular closed cavity should be modeled to include the effect of turbulence for Rayleigh number greater than or equal to 9 10 .The non-linear terms i j u u and qi u in the averaged momentum and energy equations respectively were modeled using...

Functionalized Geopolymers Derived From Clay And Rice Husk Ash For Removal Of Selected Heavy Metals And Methylene Blue From Aqueous Solution

ABSTRACT With the onset of industrialization, humanity has witnessed various ecological issues in the society and disturbance of ecosystem. Heavy metals and methylene blue are very toxic substances known to cause detrimental effects to human health when ingested even at low concentrations. Several techniques are available for removal of heavy metals, and dyes from the wastewater such as chemical precipitation, ion exchange, adsorption, membrane among others. Among these technologies adsorptio...

Evaluation Of Antioxidant And Anti-Inflammatory Activities, Total Phenolic And Flavonoid Content In Selected Medicinal Plants, Non-Edible Medicinal Mushrooms And Seaweed

ABSTRACT Medicinal plants play a major role for sources of lead compounds in drug discovery. Studies done have shown that plants, fungi such as mushrooms and seaweeds are a good source of bioactive compounds with anti-inflammatory, antioxidant, anti-cancer and antimicrobial activities. Antioxidants play main role by hindering oxidation by protecting cells from damage by free radicals. This protects the body from cancer and other chronic ailments like heart diseases. Anti-inflammatory effect i...

Assessment Of Levels Of Some Active Skin Lightening Compounds In Selected Facial Creams And Soaps In The Kenyan Market

ABSTRACT Cosmetics are generally used to improve the appearance by the removal or correction of blemishes and to treat diseases of the human skin and hair. Skin-lighteners which include hydroquinone, mercury, arbutin, kojic acid, ascorbyl glucoside, magnesium ascorbyl phosphate have been frequently used in skin lightening creams and soaps. However chronic exposure to mercury compounds in skin lightening creams and soaps may lead to various disorders such as nephritic, peripheral neuropathy, a...

A Numerical Study Of Turbulent Natural Convection In A Rectangular Enclosure With Localised Heating And Cooling.

ABSTRACT This study models natural turbulent convection in a rectangular enclosure with localized heating and cooling. The equations used in modeling the flow are the equation of continuity, momentum equation and the energy equation. These equations are decomposed using the Reynolds decomposition then the decomposed equations are non – dimensionalised and reduced using the Boussinesq assumptions. The model that is considered is a rectangular enclosure with one side wall being heated and the...

Determination Of Lead, Cadmium And Nickel In Henna Leaves And Cosmetic Henna Products Within Lamu County, Kenya

ABSTRACT Lawsonia inermis Linn, commonly known as henna, is an ethno botanical plant which has been used since antiquity for cosmetic and medicinal purposes. Henna painting is an art of beautification which is commonly practised by the people of Lamu County. Heavy metals such as Pb, Cd and Ni are toxic and commonly found in cosmetic products such as henna. The level of these metals in henna leaves and henna products from Lamu is not known. The aim of the study was to determine the level of Pb...

Analysis Of Essential Trace Elements In Selected Medicinal Plants Used In Kenya

ABSTRACT Kenya is endowed with nature where hundreds of medicinal plants are available. During photosynthesis and respiration process in plants, animals and other organisms, ions of metal elements play a major role with a few of the elements being essential to the body as nutrients. Trace elements Zn, Cr, V and Se with known immunological response and healing properties were analysed from selected medicinal plants available in Kenya. These plants were; Prunus africana, Urtica massaica, Mayten...

The Study of Ethnobotanical Uses by Local Healers in Taktse Chiwog from Central Bhutan

Aim: To document the ethnobotanical uses in Taktse Chiwog (Village blocks) by local healers Study Design: Semi-structured interview and direct interview was conducted with the prior approval from the Chiwog official. Two local healers/informants were contacted for interview before field visits based on their popularity and experience of using medicinal plants in their locality. Place and Duration of Study: The study was conducted at Taktse Chiwog, Trongsa Dzongkhag, Bhutan between July and O...

Ethnobotanical Study on Wealth of Homegardens in Gosiling Gewog of Tsirang District

Aim: To document the medicinal uses of homegarden plants by local healers. Study Design: Semi-structured interview was conducted with the prior approval from the gewog official. Five local healers were contacted for interview before field visits based on their popularity and experience of using medicinal plants in their locality. Place and Duration of Study: The study was conducted at Gosiling gewog, Tsirang District, Bhutan between May and June 2016. The homegarden and agricultural pract...

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

ABSTRACT The 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 mater...

In Vitro Response Of Phomopsis Theae To The Products Of Azadirachta Indica And Extracts Of Warburgia Ugandensis

ABSTRACT Tea is one of the major cash crops in Kenya and a means of livelihood to people living around the region where it is grown. Branch and collar canker disease is among the many diseases which affect the crop hence reducing its production. Methods used to control the disease mainly involve the use of chemical fungicides which are toxic and not environmentally friendly. This study was therefore done to determine the use of plant products and extracts to manage the disease. Among the prod...

Flow Of Contaminants In Urban Ground Water

Groundwater contamination occurs when man-made products such as gasoline, oil, road salts and chemicals get into the groundwater and cause it to become unsafe and unfit for human use. Drinking contaminated groundwater can have serious health effects. Diseases such as hepatitis and dysentery may be caused by contamination from septic tank waste. Poisoning may be caused by toxins that have leached into well water supplies. Wildlife can also be harmed by contaminated groundwater. Other long...


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