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“The ability of entomopathogenic nematodes to suppress larval populations of the annual bluegrass weevil, Listronotus maculicollis, was investigated under field conditions over a 3-year period (2006-2008). Combination of nematode species, application rate and timing produced strong numerical yet few statistically significant reductions. Steinernema carpocapsae

Weiser, S. feltiae Filipjev, and Heterorhabditis bacteriophora Poinar applied at 2.5 x 10(9) IJs/ha reduced first generation late instars between 69 and 94% in at least one field trial. Steinernema feltiae provided JNJ-26481585 solubility dmso a high level of control (94%) to low densities (similar to 20 larvae per 0.09 m(2)), but gave inadequate control for higher densities (24 and 50% suppression). No significant differences were found among treatment CP 456773 timings. However, applications timed to coincide with the

peak of larvae entering the soil (fourth instars) generally performed better than applications made prior to (preemptive) or after the majority of the population advanced from the fourth instar. Nematode populations declined sharply between 0 and 14 days after treatment (DAT). Although nematode populations later increased (at 28 DAT), indicating an ability to recycle within hosts in the environment, they were nearly undetectable 56 DAT when the second generation host larvae were present in the soil. Applying commercially available nematode species at standard field rates cannot reliably reduce L. maculicollis immature densities on golf courses, nor will single applications suppress multiple generations. Future research will need to identify application strategies to improve biocontrol consistency.”
“Acetate kinase catalyzes the reversible magnesium-dependent phosphoryl transfer from ATP to acetate to form acetyl phosphate and ADP. Here, we report functional

and some structural properties of cold-adapted psychrotrophic enzyme; acetate kinase with those from mesophilic counterpart in Escherichia coli K-12. Recombinant acetate kinase from Shewanella sp. AS-11 (SAK) and E. coli K-12 (EAK) were purified to homogeneity following affinity chromatography and followed by Super Q column chromatography as reported before [44]. Both purified enzymes are shared see more some of the common properties such as (similar molecular mass, amino acid sequence and similar optimum pH), but characterized shift in the apparent optimum temperature of specific activity to lower temperature as well as by a lower thermal stability compared with EAK. The functional comparisons reveal that SAK is a cold adapted enzyme, having a higher affinity to acetate than EAK. In the acetyl phosphate and ADP-forming direction, the catalytic efficiency (k (cat)/K (m)) for acetate was 8.0 times higher for SAK than EAK at 10 A degrees C. The activity ratio of SAK to EAK was increased with decreasing temperature in both of the forward and backward reactions.