Insecticidal effects of two medicinal plants Polygonum hydropiper L. and Abrus precatorius L. leaves against the rice weevil Sitophilus oryzae L. (Coleoptera: Curculionidae)

During the study, the leaves of two medicinal plants, Polygonum hydropiper and Abrus precatorius were extracted with water, ethanol, methanol and petroleum ether solvents and tested against the rice weevil S. oryzae L. for insecticidal properties. Response varied with plant species. The mortality of adults increased with increasing dose concentrations from 1000 ppm to 5000 ppm each solution, with an exposure time of 72 hours. LC50 values calculated were found to be 15091.436 ppm with water, 5051.534 ppm with ethanol, 5111.063 ppm with methanol and 4305.348 ppm with petroleum ether extracts of P. hydropiper and 9687.292 ppm with water, 6263.849 ppm with ethanol, 4682.683 ppm with methanol and 3222.984 ppm with petroleum ether extracts of Abrus precatorius leaves corresponding their concentrations of the leaf extract solutions at 1000ppm, 2000 ppm, 3000 ppm, 4000 ppm and 5000 ppm respectively. The results of the study showed that methanol and petroleum ether extrcts of P. hydropiper and ethanol, methanol and petroleum ether extracts of A. precatorius showed good toxicity. It appeared that the leaf extracts had some insecticidal activities against S. oryzae adult. J. Biodivers. Conserv. Bioresour. Manag. 2019, 5(2): 107-114

A theoretical study on Na+ solvation in carbonate ester and ether solvents for sodium-ion batteries

The electrochemical performance of sodium-ion batteries is strongly related to the electrolyte solvents.

Determination Number Of Magnesium Nutritions From MgSO4.7H2O AND IRON FROM FeSO4.7H2O on Tetraselmiss chuii Cultivation To The Maximum Lipid Contact

This study discusses the effect of adding magnesium nutrients from MgSO4.7H2O and iron from FeSO4.7H2O to obtain maximum lipid levels in Tetraselmis chuii microalgae. The nutritional variations used were 0, 4, 6, 8 gr / L MgSO4.7H2O and 0, 24, 30, and 36 µM / L FeSO4.7H2O. Microalgae was cultivated with a photobioreactor filled with 1 L microalgae culture with a ratio of microalgae and sea water 3: 7, namely 300 ml of microalgae and 700 ml of sea water with salinity of 30 ppt. The light intensity is 2000 lux. The study began with culturing microalgae with variations in these nutrients. Then, the cell density is observed every 3 hours until the optimum time is obtained where the cell density is high. Then the microalgae is harvested and extracted so that the lipids are obtained. The extraction process was carried out using diethyl ether solvents. After obtaining the lipid mass, the microalgae lipid levels were calculated. The results showed that the highest lipid levels in Tetraselmis chuii microalgae were obtained by the addition of MgSO4.7H2O 6 gram and the addition of FeSO4.7H2O 36 µM which was 20,175%.

Bone Degreasing – Finding a New Solution to an Old Problem

The South Australian Museum boasts the largest and most comprehensive cetacean collection in Australia, including various large cetacean skeletons. The preparation of these skeletons was done at various locations throughout the history of the Museum until the state government funded a purpose-built preparation facility which opened in 1983. The well-equipped centre was fitted with a large (2800 L) custom-built liquid-vapour degreaser that used trichloroethylene (TCE) as solvent. Many beautifully degreased skeletons, including a 22 m pygmy blue whale, were prepared during its 15-year operation. An accidental spill of TCE in 1999 led to the decommissioning of the unit. The decision to abandon the use of the toxic and dangerous TCE has led to a series of experiments to find a benign replacement process that will work either with the existing degreaser or heated maceration vats. Numerous chemicals and treatment methods have been trialled with limited success. However, one particular group of chemicals, glycol ether surfactant compounds, has shown promise and has been the main focus for our ongoing studies. Glycol ethers are broad-spectrum active solvents characterised by high dilution ratios, low evaporation rates and wide solubility range. Their unique solubility characteristics also allow them to be used as a coupling solvent in more complex situations containing both hydrophilic and hydrophobic components, and because of their compatibility with non-ionic surfactants, blended formulations with glycol ether solvents may provide a new solution to an old problem.