1,4,5,6-Tetrahydro-2-methyl-4-pyrimidinecarboxylic acid (ectoine) is an excellent osmoprotectant. The biosynthetic pathway of ectoine from aspartic beta-semialdehyde (ASA), in Halomonas elongata, was elucidated by purification and characterization of each enzyme involved. 2,4-Diaminobutyrate (DABA) aminotransferase catalyzed reversively the first step of the pathway, conversion of ASA to DABA b...

The temperature characteristic of respiration of Azotobacter vinelandii possesses a constant value of 19,330 +/- 165 over the temperature range 20-30 degrees C. This value is independent of pH, oxygen tension, age of culture, and other factors within the limits studied. The optimum temperature of respiration is 34-35 degrees C., with limits at about 10 degrees and 50 degrees C.

Electroantennogram, Electrosensillogram, Optimum Curves, Hysteresis, Temperature Dependence By recording the temperature dependence of electroantennograms with Lepidoptera antennae optimum curves were obtained, and a hysteresis phenomenon was observed by passing tempera­ ture cycles. The latter also occur with single cell recording (electrosensillogram) in the receptor potentials as well as in ...

Present study consists the, effect of temperature (10-30C), salinity (15-35 psu) and biofilm on the settlement of Enteromorpha flexousa zoospores. Settlement of zoospores was significantly (p<0.05) influenced by both temperature and salinity. Highest percentage of settlement occurred at 25C and 30 psu respectively. Subsequently the influence of biofilm was evaluated at the optimum 25C and 30 ps...

The experiment of the rheocasting-rolling for semi-solid magnesium was carried out on the equipment made by ourselves in our laboratory. Semi-solid AZ91D magnesium slurry was prepared by cooling slope and mchanical sirring The evolution of microstructure under different technological parameters were studied. The results show that the technological parameters have great influence on the microstr...

Glucanase enzyme isolated from Trichoderma isolates were purified to homogeneity using ammonium persulphate precipitation and Fast Protein Liquid Chromatography. Purity of the isolated enzyme was confirmed by SDS-PAGE. Enzymatic properties such as effect of temperature, pH, SDS and EDTA were determined. Molecular weight of Trichoderma isolates was found to be around 55 kDa. The optimum temperat...

This paper treats the simple example of heating a system from a given initial to a given final temperature with minimum entropy production. The allowed control for the process is the selection of K temperatures for intermediate heat baths. The problem is sufficiently simple to allow analytic approaches and we compare the optimal solution with the solution prescribed by equal thermodynamic dista...

The purpose of this investigation was to study the effect of Bacillus subtilis CM5 in solid state fermentation using cassava bagasse for production of exo-polygalacturonase (exo-PG). Response surface methodology was used to evaluate the effect of four main variables, i.e. incubation period, initial medium pH, moisture holding capacity (MHC) and incubation temperature on enzyme production. A ful...

Future sea surface salinity missions will require Lband radiometers to have calibration stabilities of ≤ 0.05 K over 2 days. This research program has focused on determining the optimum radiometer requirements and configuration to achieve this objective. System configuration and component performance have been evaluated with radiometer test beds at both JPL and GSFC. The GSFC testbed uses a cry...