1. The descending contralateral movement detector (DCMD) of the locust responds vigorously to small target (ca. 5°) stimuli; this response is inhibited by simultaneous or subsequent rotation of a radial grating (windmill) pattern (subtending 19-90 of visual angle) and suppressed by earlier rotation, 2. The excitation produced in the DCMD by rotation of a radial grating pattern depends only on t...

A first attempt was made to prepare cyclic olefin polymer/copolymer (COP/COC) flat-sheet porous membranes by the well-known non-solvent induced phase separation method. In this study, two solvents (chloroform and 1,2,4-trichlorobenzene), different additives (polyvinylpyrrolidone, PVP, polyethylene glycol, PEG400, oxide, PEO, Sorbitan monooleate, Span 80) coagulants (acetone 70/30 wt% acetone/wa...

Chemical pollutants, such as methyl orange (MO), constitute the main ingredients in textile industry wastewater, and specifically, dyeing process. The use of chemicals leads to huge quantities unfixed dyes make their way water effluent consequently escalates pollution problem. This work investigates incorporation hydrophobic carbon nanospheres (CNS) prepared from pyrolysis acetylene using chemi...

A reduced-eye (re) mutant grasshopper of Melanoplus sanguinipes has been characterized by small flat compound eyes lacking facets, no lateral ocelli and only a remnant of the median ocellus. The re grasshoppers walk, jump, fly and feed in a normal manner, but do not respond to visual and auditory stimuli, suggesting they may be blind and deaf. Extracellular recordings from the ventral nerve cor...

Experimental investigations were carried out on removal of arsenic from contaminated groundwater by employing a new flat-sheet cross flow membrane module fitted with a hydrophobic polyvinylidenefluoride (PVDF) microfiltration membrane. The new design of the solar-driven membrane module in direct contact membrane distillation (DCMD) configuration successfully produced almost 100 per cent arsenic...

DWTP RO brine disposal options have been studied in this work in terms of technical and economic feasibility. Different pretreatment sequences combining acidification and aeration were carried out and evaluated batchwise in a plate and frame DCMD system at feed and permeate temperatures of 54°C and 21°C respectively. Results showed that acidification provides a simple and inexpensive process in...

Brines produced by desalination processes such as reverse osmosis (RO), electrodialysis reversal (EDR) and ion-exchange (IX) holds pollution potential for the water environment if not properly handled. These brines contain a high water content (95–98%) and chemicals that could possibly be recovered for reuse. Therefore, direct contact membrane distillation (DCMD) which has the potential for wat...