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Page no - | ABSTRACT | PDF | FULL TEXT | e-PUB Background: The development of innovative eco-sustainable bio-nano-composites materials based on cellulose nanomaterials obtained from agricultural waste such as rapeseed plant straw and polymeric materials with improved properties. At first, cellulose was extracted from rapeseed plant straw and cellulosic and no cellulosic materials were estimated. It was found that the rapeseed plant straw contained about 43.48 wt.% cellulosic materials and 56.52 wt.% no cellulosic materials. It was also found that the rapeseed plant straw content about 34.84 wt.% α- cellulose. Then, nano-cellulose was prepared by acid hydrolysis of α -cellulose obtained from rapeseed plant straw. Poly vinyl acetate (PVAc) was prepared by soap free emulsion polymerization of vinyl monomer. Natural rubber (NR) collected as latex was oxidized by KMnO4. Blends of NR and oxidized NR with PVAc of different compositions such as NR60/PVAc40, NR40/PVAc60, ONR60/PVAc40, ONR40/PVAc60 were prepared by mixing NR latex and PVAc emulsion and followed by drying in an oven at 60°C. Composites of NR60/PVAc40 and ONR60/PVAc40 reinforced nano-cellulose (NC) were also prepared in similar way. The blends and composites were then characterized by FTIR, SEM, and Tensile test (TS). FTIR analysis confirmed the oxidation of NR and shown the variation of the functional groups in the blends and composites compared with the FTIR spectrum of NR, ONR and PVAc. SEM study exhibited that the nano-cellulose were dispersed within NR/PVAc and ONR/PVAc blends matrices with a little agglomeration. The tensile test results showed that the strength in composites was increased due to the reinforcing effect of nano-cellulose (NC). Objectives: The aim of this study is to assess the Preparation and characterization of binary blends of NR and oxidized NR with PVAc. Methods: This is an observational study. The study used to be carried out in the admitted patient’s Department of Applied Chemistry and Chemical Engineering, Islamic University, Kushtia-7003, Bangladesh. The duration of the period from Data was entered in MS Excel and Statistical analysis was done using SPSS trial version. Results: This study shows that the according to Constituent, Cellulose was 43.4822%, Alpha-Cellulose were 34.8427% and Cellulose were 8.6395%. And according to Source, Rice Straw were 32.15% %, Sugarcane were 41-43%, Rye Straw were 31.8-42.64%, Corn Stalks were 29.80% and Wheat Straw were 34-40%. Conclusion: Novel eco-friendly bio-nano-composites substances primarily based on renewable and sustainable assets namely natural rubber (NR) and nano-cellulose received from rapeseed plant straw as properly as poly vinyl acetate (PVAc) have been developed. In order to enhance the interfacial interactions amongst the composite factors such as NR, PVAc and NC, oxidation of the NR latex was once carried out by way of KMnO4 before blending mixing with PVAc emulsion and NC suspension.

Background: The three Hill Tract Districts are highly malaria transmission areas in Bangladesh and intensified coverage of LLINs to reduce the number of malaria cases. Information of the bionomics of disease vectors and biting behavior is more essential to take appropriate vector control measures. The bionomics study was carried out after approximately 10 years back (2005-2006), if there any changes in vector behavior after introducing the long lasting insecticidal nets (LLINs) in malaria endemic areas. Method: Three sites were selected based on the number of last several years reported cases and malariogenic potentials including geographical condition, altitude, latitude, presence of vectors, availability of breeding sources, favorable temperature, humidity, rainfall and other possible risk factors. Mosquitoes were collected through the human and animal landing from outdoor and indoor, Pythrum Spray sheet collection, morning resting collection form human dwelling and cattle shed. Results: Mosquitoes were collected through the hand aspirator and Pyrethrum spray sheet collection during day and night time. A total of 8078 Anopheles mosquitoes, 20 specie were collected, out of that 3858 (47.76 %) are An. vagus is the most abundant followed by An. willmori 965 (11.95), An. nigerrimus 848 (10.50%), An. kochi 734 (9.09%), An. barbirostris 444 (5.50%), An. jamesii 367 (4.54 %), An. philippinensis 182 (2.25), A subpictus 163 (2.02%), An. annularis 135 (1.67%), the most virulent vector An baimaii 72(0.89), An culicifacies 51 (0.64%), An. minimus 26 (0.32%). Conclusion: The main malaria vectors A baimaii (=dirus) has been collected from 19.18 to 02.30 hrs and the pick biting period is identified 20.30 to 21.30 hrs and 21.30 to 22.30 The early biting of the An baimai indicate its behavioural changes. A vagus prevalence was higher among the collected anopheline populations in all three places.