Clay Pots Research Articles

Characterization of Ceramic Tile Bodies Prepared From Clays Collected from Four

Sierra Leone has high potentials for the setting-up of ceramic industry because of its huge virgin deposits of raw materials, chiefly clay, but lacks the technological know-how to utilize these materials to an economically sound level. Tile body offers a foundation for the performance of a glaze. The chemical and mineralogical composition of these clay bodies coupled with some physical properties, such a plasticity, bulk density, porosity, and water absorption, play significant role in determining the quality of the glazed surface.This is attested by certain glaze defects like pinholes, crazing and crawling on the glaze surface resulting mainly from bubble development within the body matrix during firing. The study aims at contributing to the promotion and use of appropriate ceramic building materials technology in Sierra Leone, by providing relevant research data to guide the production of quality ceramic products. The three key objectives, were to determine (1) the physical properties (2) chemical properties (3) mechanical properties of the clay samples investigated for their suitability in clay tile bodies production. Clay samples were collected from four sites in Sierra Leone namely Matankay (C-M) in the Western Rural District, Bo (C-B) in Bo District, Koribondo (C-K) in Pujehun District and Yele (C-Y) in Tonkolili District. Based on their plasticity index values, grain size distribution, bulk density, porosity and dry-fired shrinkage results obtained from this study, the four clay samples investigated are suitable for clay tile body production provided grog, frits, fluxes and other components are added proportionately and fired at temperatures above 1100oC to improve vitrification of the clay tile body during biscuit firing before application of the glaze.

Impact of ceramic packaging on the quality and safety of Armenian fermented dairy product Matsoun

Background: Packaging is essential for food safety, as it acts as a barrier against contaminants that can cause spoilage and affect human health. The Armenian fermented dairy product, matsoun, is packaged not only in plastic and glass but also in clay pots. However, the impact of traditional packaging on the quality and safety of matsoun, especially heavy metal migration, remains under-researched. Objective: This study aimed to investigate the impact of ceramic packaging material on the quality and safety of matsoun during storage. Specifically, it compared the physicochemical properties (pH, titratable acidity), lactic acid bacteria (LAB) populations, and metal migration during storage. Methods: Six samples of matsoun were prepared and packaged in sterilized glass and ceramic containers. The samples were stored at 4 °C and analyzed on days 1, 7, and 15 of storage. The parameters measured included pH, titratable acidity, and LAB counts (coccus and bacillus). Heavy metal migration (Cd, Pb, Hg, As) was analyzed using atomic absorption spectroscopy. Results: The pH of samples packaged in ceramic and glass containers decreased over 15 days of storage, from 4.61 to 4.24 and 4.6 to 4.27, respectively. Titratable acidity increased in both groups, reaching 1.2 % lactic acid. A decrease in bacilli was observed in ceramic-packaged matsoun. The lead concentration remained constant at 0.0045 ppm across all samples. In ceramic containers, cadmium concentration increased from 0.0015 ppm to 0.0029 ppm by day 15. Conclusion: This study observed a decrease in pH, an increase in titratable acidity, and a relatively constant number of lactic acid bacteria indicating ongoing fermentation. The results showed nondetectable concentrations of arsenic (As) and mercury (Hg). The lead (Pb) concentration in all samples remained within the World Health Organization’s (WHO) allowed limit of 0.02 ppm. However, the concentration of cadmium (Cd) concentration in ceramic-packed increased, exceeding the WHO limit of 0.002 ppm. Further research is necessary to identify the sources of cadmium contamination. Keywords: food packaging, ceramic, matsou​​n​, heavy metal migration, food safety

Novel Ceramic Clay Automatic Feeding System and Simulation Analysis

This study aims to verify the feasibility and effectiveness of an automatic feeding system in the ceramic clay-forming process. Through a series of clay-forming experiments, the system’s performance under various process parameters was examined. Precision sensors and data recording devices were used to monitor and record key data during the experimental process in real-time. The results demonstrate that the automatic feeding system can supply clay steadily and continuously under set parameters, ensuring a smooth forming process and significantly improving efficiency. Quantitatively, the system achieved a 30% increase in Vickers hardness, reflecting enhanced mechanical properties of the formed clay bodies. Additionally, there was a notable improvement in axial stress–strain characteristics, indicating better structural integrity and consistency. These improvements reduced human errors and material waste, enhancing production efficiency and product quality. Future research will focus on further optimizing system design and exploring its applications in a broader range of ceramic manufacturing processes.

Stability of physicochemical and microbiological properties of Geniotrigona thoracica honey after moisture reduction and long-term storage in different containers

Stingless bee honey is nutritious but prone to fermentation due to high moisture content and improper storage, leading to quality deterioration. This study investigates the impact of container types and storage time on the properties of minimally treated Geniotrigona thoracica honey using clay pots. The moisture content of the raw honey was reduced from 28.2 g/100 g to 19.5 g/100 g after clay pot storage. The treated honey was then divided into four different containers: glass jars (clear and amber) and polyethylene terephthalate jars (clear and amber), and stored at 27 ± 2 °C for 365 days. After 365 days, moisture content slightly decreased in all containers, with honey in amber glass jar showing the lowest at 16.8 g/100 g. As moisture decreased, TSS increased, indicating sugar concentration. Ash content, viscosity, and free acidity increased over time, while pH values slightly decreased but stayed within acceptable limits. Honey colour increased with honey in amber glass jar showed the darkest honey (286 ± 2 mm Pfund) after 365 days. For all samples, the total phenolic content increased indicating enhanced antioxidant properties. While the hydroxymethylfurfural level increased but remained within standards with honey stored in amber PET jar had the lowest level (10.8 ± 0.2 mg/kg). Overall, moisture reduction with clay pots and proper storage containers can maintain and enhance honey quality during extended storage, with all samples meeting quality standards throughout.

The Effect of Inorganic-Based Plasticizers on Clay Bodies

The Effect of Inorganic-Based Plasticizers on Clay Bodies

Injection 3D Printing of Doubly Curved Ceramic Shells in Non-Synthetic Particle Suspensions.

This paper examines the application of non-synthetic particle suspensions as a support medium for the additive manufacturing of complex doubly curved ceramic shells with overhangs between 0° and 90° using clay paste. In this method, the build-up material is injected within a constant volume of air-permeable particle suspension. As the used clay paste does not solidify right after injection, the suspension operates like a support medium and enables various print path strategies. Different non-synthetic suspension mixtures, including solid and flexible components such as quartz sand, refractory clay, various types of wood shavings, and cotton flocks, were evaluated for their ability to securely hold the injected material while allowing drying of the water-based clay body and its shrinkage. The balance between grain composition, added water, and the compressibility of the mixture during printing and drying played a pivotal role in the particle suspension design and assessment. Furthermore, the moisture absorption of the particle suspension and the structural integrity of the layer bond of the fired ceramics were also assessed. The examined additive manufacturing process not only enables the production of meso-scale doubly curved ceramic shells with average overhang of 56° but also introduces a new practice for designing specialized surfaces and constructions.

A Method Development to Enhance Water Alkalinity for Reducing Health Risks Associated with Unsafe Water

Background: Water is essential for life, sustaining both biological and human activities. It plays a crucial role in the physiological functions of the human body and shapes human civilization. Water’s unique properties and its pH, a measure of its acidity or alkalinity, influence its quality and impact on health. The pH of drinking water is particularly important for microbial activity and human health. This study aimed to investigate the effectiveness of increasing water alkalinity, with a focus on improving pH levels in tap water through the use of clay pots. Methods: The study was conducted in Sulaymaniyah city, with tap water sourced from the Dokan Dam. Ceramic clay pots, selected for their availability and affordability, were used to treat the tap water. The experiment measured the pH of untreated tap water and compared it to water stored in clay pots over a 24-hour period for 12 weeks. A paired t-test was used to analyze the difference in pH levels between untreated and treated water across two seasons, autumn and winter. Results: The results showed a significant increase in the pH levels of tap water after treatment with clay pots. In autumn, pH values rose by an average of 2.86, while in winter, the increase averaged 2.66. Statistical analysis confirmed highly significant differences in pH between untreated and treated water for both seasons (p = 0.000002), demonstrating the effectiveness of clay pots in raising water alkalinity. Conclusion: The study concluded that clay pots offer a simple and cost-effective method to increase the alkalinity of tap water, improving its quality. This approach can benefit public health, particularly in regions with limited access to advanced water treatment technologies. Further research is needed to explore the long-term effects and broader applications of using clay pots for water treatment.

Simplified oxygen-limited thermal treatment without tube furnace and inert gas

The article introduces a cost-effective and user-friendly alternative to traditional pyrolysis techniques, obviating the necessity for intricate tube furnaces and inert gas environments. This novel approach employs materials capable of reacting with and sequestering oxygen to establish an oxygen-depleted atmosphere. The experimental setup entails positioning a crucible containing the sample inside a ceramic pot, enveloped by varying sizes of wood coal particles, and subsequently subjecting the ceramic pot to furnace conditions. Utilizing this oxygen-limited strategy, a biochar sample, derived via hydrothermal processing, underwent carbonization at 650°C for 6.5 hours, with outcomes compared against ambient condition carbonization under identical temperature and duration parameters. Gravimetric analysis revealed that wood coal effectively curtails oxygen availability, augmenting biochar yield from 1.53 % to 19.50 %. Fourier-transform infrared spectroscopy (FTIR) indicates diminished oxygen functional groups, while X-ray diffraction (XRD) and field-emission scanning electron microscopy (FESEM) affirmed a denser, compact carbon structure in biochar produced under oxygen-restricted conditions versus ambient conditions. The carbon content percentage in biochar samples treated at 650°C for 6.5 hours under both conditions was assessed via energy-dispersive X-ray spectroscopy (EDX) data. The emergence of a novel carbon nanomaterial, derived from biomass waste through our oxygen-limiting method, may exhibits applications in energy storage and water purification. Our approach offers simplicity, cost-efficiency, and straightforward implementation while upholding the integrity of pyrolysis/thermal treatment within inert conditions, ensuring the robustness of the procedure.

Mathematical Concepts and Cultural Values in Sonaf Tamkesi: Ethnomathematics Study in a Traditional Village on Timor Island

Mathematics is a universal science, and it is crucial for everyone to master it, both in terms of its applications and its cognitive patterns. The purpose of this research is to explore the concepts of mathematics and cultural values found in the artifacts of Sonaf Tamkesi Manufui. The study was conducted in the traditional village of Tamkesi, south Biboki District, North Central Timor Regency, in July 2023. The subjects of this study were three community leaders. The type of data collected for this research was primary data obtained through documentation and interviews between the researcher and the respondents. Data analysis was conducted through stages of domain analysis, taxonomy, componential analysis, and cultural themes. The research findings indicate that there are concepts of plane geometry in the artifacts such as trapeziums, rectangles, squares, rhombuses, triangles, circles, cylinders, hexagons, and cubes. Meanwhile, the cultural values of the artifacts in Sonaf Tamkesi are the roof symbolizes harmony, the door symbolizes greatness and respect for ancestors, the pillars symbolize vertical relations with ancestors, the betel-nut container symbolizes service, the clay pot symbolizes a gift from ancestors to the living, the hearth symbolizes balance, and harmony in achieving goals.

A Sociolinguistic Analysis of Traditional Marriage Terms in Awgbu-Igbo

This research is a sociolinguistic analysis of traditional marriage terms in Awgbu, an Igbo-speaking community in Anambra State, Nigeria. The study, which adopts a qualitative research design, aims to gain insights into the social, cultural and linguistic changes in Awgbu-Igbo regarding traditional marriage terms. For data collection, indigenous Awgbu older men and women from the five villages in Awgbu who are knowledgeable in traditional marriage practices of Awgbu were interviewed using traditional marriage list of Awgbu. Traditional marriage terms, consisting of 40 terms, were collected from their responses. The theoretical framework for data analysis is J.R. Firth’s (1957) and Fillmore (1984) Lexical Semantics Theory. The findings from this research show that traditional marriage terms have socio-cultural significance in Awgbu. These terms have also changed due to globalisation, modernisation, and Christianity. Such changes involve the eradication of the ị́gbāḿmị́ị́ ceremony and ínēnē ụ́nọ̀ rites due to globalisation. Also, the use of òbènè (calabash), ìtóòtù (ceramic pot) and ìkóḿmị́ị̄/ḿmānyá (traditional cups) are now replaced with gallons, plastic and breakable cups. Likewise, the practice of égwúìtìrìm̀mọ́nwụ́ which involves dance and music performance is no longer feasible, signaling the loss of an exciting Awgbu culture.

Exploring the use of clay pots as sustainable storage containers to improve water quality

BackgroundCurrently, tap water consumption is not highly preferred in Egypt and around the world. People prefer to consume bottled water because they believe that it is much safer and tastes better than tap water. Unfortunately, this preference can create an economic burden for many people, especially in developing countries. Clay pots can be used to provide cool, alkaline drinking water because of their porous micro-texture, which traps pollutants. This study aimed to investigate the use of clay pots to store tap water and its impact on the requirements for drinking water quality. This is done with the intent to decrease the need for bottled water as a means of offering a more sustainable and economical option.MethodsIn this study, the efficiency of clay pots as sustainable storage containers for drinking water was tested by measuring physicochemical parameters (pH, TDS, EC, turbidity, DO, ammonia, chloride, total hardness, Ca hardness, Mg hardness, chlorine, Zn, and CaCO3) and biological parameters (TPC and Legionella).ResultsAfter 7 days of storage, the quality of the water stored in clay pots met the standards set by the Egyptian law with a significant difference (p < 0.05) before and after the storage of water It was found that the dissolved oxygen increased from 6.17 ppm to 7.52 ppm after 7 days. As for total hardness, it declined from 195 to 178 ppm. There was also a significant drop in terms of TDS from 338 to 275 ppm. Furthermore, clay pots effectively filtered out both total viable bacteria and Legionella.ConclusionThis study proved the efficiency of using these containers with respect to some indicator values for tap water and tank water analysis. Clay pots are an excellent, cost-effective, and sustainable alternative for storing water.

Palaeoparasitological evidence for a possible sanitary stone vessel from the Roman city of Viminacium, Serbia

The aim of this research is to determine whether palaeoparasitological analysis of mineralized concretions found within a stone vessel from the Roman city of Viminacium can shed light on its past use. The ruins of Viminacium, the capital of the Roman province of Moesia Superior, are situated 90 km southeast of the Belgrade in Serbia, and about 12 km from the town of Kostolac in the vicinity of villages Stari Kostolac and Drmno. It was established as a military camp in the first century CE with a legion permanently stationed there. The stone vessel was discovered during systematic archaeological excavations of the public bath complex with a public toilet near the amphitheater in Viminacium. The finding is dated by relative chronology in the second half of the third century. The vessel is topologically defined as a mortarium according to shape and size. Mineralized deposits were preserved inside the vessel rim, sides, and base. Microscopic analysis of the mineralized deposit revealed eggs of intestinal nematode roundworms (most likely Ascaris sp., but possibly Pterygodermatites sp.) from the sides and base of the vessel. This is the first time that parasite eggs have been identified from concretions inside a Roman stone vessel, and have strong parallels with a previous finding of parasite eggs in mineralized deposits from a ceramic chamber pot from late antique Sicily. The finding suggests the possible use, or secondary use, and function of the stone vessel as a sanitary item (such as storing wiping implements) for personal hygiene in the public bath of Viminacium. Further paleoparasitological research requires a systematic analysis of calcified deposits from Roman period stone vessels for more clear insights into their function, use and reuse.

Sustaining Family Business: Unveiling the Resilience of Majuli Potters in Assam, India

The Kumars of Salmora village in the south-eastern part of Majuli, Assam, India, are an example of a family managed business of handcrafting river clay pots. Salmora became the Kumhar village as a result of clay, which became the primary reason for the settlement of potters in the area. The hand-beaten pottery is a cottage industry of Majuli and has been passed down through generations. Currently, the policy restrictions and the dying art form have made people think about how to sustain the handicraft, their livelihoods woven around this art form, and continue their passion/skill in the given challenging situation. This makes it interesting to adopt the case research method to examine the struggle of small businesses to sustain their livelihoods, on the one hand, and the limited alternative sources of livelihood, on the other hand, thus making the survival and sustenance of the family business a challenge, where pottery was their family business for generations. The case discussion revolves around the problems, concerns and causes for the deterioration of the art forms and highlights the issues and challenges. It contributes to the resources in the emerging family business management literature and also the family businesses to strategise in similar contexts.

ÇATALHÖYÜK GASTRONOMY CULTURE THE FIRST KNOWN CULINARY PRACTICES IN ANATOLIA (TÜRKİYE) AND WORLD HISTORY

Çatalhöyük is an archaeological site located in the Çumra district of Konya, Turkey, with a deep-rooted history dating back to around 7500 BCE and still not fully explored. In this article, the eating habits and gastronomy culture of Çatalhöyük are examined, focusing on its history and culture. Remarkable findings in terms of dietary culture include the discovery of fossils of charcoal, grains, seeds, wild fruits, and plant bulbs. Additionally, the presence of hearths, storage containers, food processing tools, and grain storages within adjacent houses demonstrates how dietary activities were conducted. The abundance of wooden bowls, clay pots, and items made from plants such as baskets, crates, and mats as kitchen utensils indicates the processing, consumption, long-term storage, and potential for future production of these products. According to research, it can be said that herbs such as rye, chickpeas, lentils, figs, plums, sumac, blackberries, mallow, purslane, clover, and bird's foot trefoil were used during that period. Moreover, it is known that crops such as barley, wheat, millet, peas, chickpeas, lentils, almonds, and gum trees were also utilized. However, some wall paintings and decorations on utensils do not fully explain the types of meals prepared during that time. Therefore, further research is needed to fully understand the dietary culture at Çatalhöyük. This article aims to shed more light on the culinary culture of Çatalhöyük by conducting an in-depth literature review online, thereby contributing new insights to both Turkish and global gastronomy literature.

Ancient and historical cooking pots and food: an eternal communion. A topical review

AbstractThis contribution provides a topical view at and review of traditional clay‐based utilitarian cooking pots that were used for millennia to prepare, serve, display, and distribute foodstuff. Key mechanical and thermal properties of ceramic cooking vessels will be discussed and strategies of property optimization outlined. In addition, some important chemical changes food constituents undergo during cooking will be explained. Mass‐produced ancient ceramic cooking pots from Neolithic Mesopotamia have revolutionized the art of cooking by allowing foodstuff to be processed in water. As an example of successfully optimizing the properties of cooking vessels, emphasis is being given to Indigenous prehistoric North American ware of the Mississippian culture (c. 800 to 1600 CE) that show impressively how ancient potters overcame the technological challenges posed by essentially unsuitable smectite‐rich clays with extreme plasticity and high swell–shrink ratio by adding copious amounts of burnt mussel shells as temper material.

Contribution to the knowledge of the nesting biology of Eumenine wasps (Hymenoptera, Vespidae) in the Brazilian Amazonia

ABSTRACT Several recent studies have improved our knowledge on the biodiversity and evolution of Eumeninae wasps, yet many groups lack systematic reviews, and there are still many gaps regarding the nesting biology, with the rather fragmentary information dispersed in the literature. Eumeninae are solitary wasps and important predatory insects regulating arthropod populations and exhibiting remarkable nest-building behaviors. Nesting strategies include using preexisting cavities, making clay pots, or other exposed structures built with plant material, sometimes incorporating chewed leaves, cellulose pulp, or plant resins. Understanding the nesting biology of Eumeninae is important for elucidating the origins of group living and eusociality, as these species range from solitary to primitively social. However, there is a scarcity of information on behavior and nest architecture, hindering a comprehensive understanding of these subjects. In this study, we describe and illustrate for the first time the nest of Monobia funebris Gribodo, 1891 (Odynerini), the nest of Eumenes versicolor de Saussure, 1852 (Eumenini), and provide additional information on the nesting of Pachymenes ghilianii (Spinosa, 1851) (Eumenini) from nests collected in the Brazilian Amazonia. Our observations reveal new facts about nest architecture in Eumeninae and highlight the need for additional efforts to elucidate aspects of the nesting behavior of M. funebris and the continued presence of female P. ghilianii in the nest after its completion.

Chickpea seed endophyte Enterobacter sp. mediated yield and nutritional enrichment of chickpea for improving human and livestock health.

Chickpeas (Cicer arietinum L.) are used as a good source of proteins and energy in the diets of various organisms including humans and animals. Chickpea straws can serve as an alternative option for forage for different ruminants. This research mainly focussed on screening the effects of adding beneficial chickpea seed endophytes on increasing the nutritional properties of the different edible parts of chickpea plants. Two efficient chickpea seed endophytes (Enterobacter sp. strain BHUJPCS-2 and BHUJPCS-8) were selected and applied to the chickpea seeds before sowing in the experiment conducted on clay pots. Chickpea seeds treated with both endophytes showed improved plant growth and biomass accumulation. Notably, improvements in the uptake of mineral nutrients were found in the foliage, pericarp, and seed of the chickpea plants. Additionally, nutritional properties such as total phenolics (0.47, 0.25, and 0.55 folds), total protein (0.04, 0.21, and 0.18 folds), carbohydrate content (0.31, 0.32, and 0.31 folds), and total flavonoid content (0.45, 027, and 0.8 folds) were increased in different parts (foliage, pericarp, and seed) of the chickpea plants compared to the control plants. The seed endophyte-treated plants showed a significant increase in mineral accumulation and improvement in nutrition in the different edible parts of chickpea plants. The results showed that the seed endophyte-mediated increase in dietary and nutrient value of the different parts (pericarp, foliage, and seeds) of chickpea are consumed by humans, whereas the other parts (pericarp and foliage) are used as alternative options for forage and chaff in livestock diets and may have direct effects on their nutritional conditions.

Study on Manufacturing of Bricks by Using Waste Foundry Sand

The main objective of this project is to utilize waste foundry sand (WFS) from foundry industry in manufacturing of bricks. The entire process of combining clay mixtures, forming of bricks, drying and firing was done with local conditions. With minimum process it was possible to introduce up to 30% WFS in clay bodies to produce bricks of desirable properties. The minimum average wet compression resistance of 5.54Mpa, and maximum average water absorption of 20.76% was obtained for bricks containing 30% WFS, when fired at 900 C. There was insignificant difference in apparent porosity, water absorption, and specific gravity of bricks containing WFS, when compared to commercial bricks. The addition of WFS reduced the bulk density of the bricks, which has also caused reduction in compressive strength. WFS bricks can be classified as class II bricks, based on recommendations of IS 1077 standard specification. These bricks can be used in single storied load bearing structures, and also in the construction of infill walls in multi-storied framed structures.

Royal advertising toothpaste pot lids.

Royal patronage is not something new. Engraved images of British royalty were used by early toothpaste manufacturers, dentists and perfumiers to convey royal endorsement to boost their product sales in the nineteenth and early twentieth centuries. Packaged in high-quality ceramic pots, these toothpastes and powders promoted cleaning, beautifying and preserving the teeth and gums. These fascinating containers, sealed with a transfer-printed lid, feature inventive designs and typefaces and highlight sophisticated manufacturing and marketing skills to entice consumers. Many have been re-discovered from the excavation of former rubbish tips and are often the only tangible evidence of long defunct businesses that elected to use this latest form of packaging.

Stage-specific insecticide susceptibility and life-table analysis of the dengue vector mosquitoes &lt;em&gt;Aedes aegypti&lt;/em&gt; and &lt;em&gt;Ae. albopictus&lt;/em&gt;

Vector resistance to insecticides is a significant challenge in the control of mosquito-borne diseases such as dengue. Analysis of the growth rate and survivorship of the immature stages of larvae has been important in formulating effective vector control strategies. The present study aimed to assess insecticide resistance in both larvae and adults of Aedes aegypti and Ae. albopictus, and the life tables of their immature stages.Mosquito eggs collected from Kurunegala and Colombo districts of Sri Lanka from January to March 2023 were reared under laboratory conditions. Larval bioassays were carried out with temephos (0.0125 ppm, 0.0625ppm and 0.125ppm) and, the adult bioassays were with pyrethroids (0.03% deltamethrin, 0.05% and 0.08% lambdacyhalothrin, 0.04% permethrin) and malathion (1%and 5%). Biochemical assays were used to evaluate the activity of insecticide-detoxifying enzymes and the insensitivity of the organophosphate target site acetylcholinesterase. Survivorship of immature stages under laboratory conditions and semi-field conditions i.e., bamboo stumps, tyres and clay pots, were studied using Kaplan-Meier survival analysis.Larvae and adults of both species from Kurunegala were susceptible to all the insecticides tested, whereas Colombo populations were resistant. Acetylcholinesterases were largely sensitive in all vector populations. Higher activities of esterases, glutathione s-transferases and monooxygenases were found in Colombo populations. Results indicated that Ae. aegypti larvae were more resistant to insecticides than Ae. albopictus larvae. Also, the mechanisms of insecticide resistance were well developed in adults than in larvae.Aedes aegypti larval development time (5 days) was significantly shorter than that of Ae. albopictus (9 days) under laboratory conditions. Survival probabilities of them were 76-80%. Egg hatching to adult emergence period was 8 days for Ae. aegypti and 13 days for Ae. albopictus. This period, under semifield conditions were; bamboo stumps 7-7.2 days, tyres 10-11.3 days, and clay pots 13.8-14 days with survival rates varied from 28.8 to 63% for both species. This study highlights stage specific response of dengue vectors to insecticides and survivorship of their immature stages in different habitats. This knowledge can be effectively used in future dengue vector control programmes.