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Nitrogen transformations in fallen tree boles and mineral

1999/6/1 · Headspace gas samples were introduced into a Carle AGC Series 100 isothermal gas chromatograph fitted with a thermal conductivity detector (EG&G Chandler Engineering, Broken Arrow, Oklahoma, USA). For the 30-d aerobic incubation subsamples, Mason jars were flushed with ambient air following each CO: measurement so that the C[O.sub.2] concentration in the headspace never

Effect of Aldrich humic acid on water–atmosphere

2009/2/1 · David et al. (2000), for example, report significant reductions in the apparent K AW of D5 measured in simulated waste water using equilibrium partitioning in closed headspace vials. In this paper, we attempt to ascertain the importance of volatilisation as a loss mechanism and the role of dissolved organic carbon concentration in reducing the air–water flux.

Salivary β-glucosidase as a direct factor influencing the

Samples were centrifuged 10.000×g, stored in glass vials with perforating caps and incubated overnight at 15 C with 1.4U of Bacillus polymyxa β-glucosidase. One unit of enzyme is defined as the amount of the enzyme that catalyzes the conversion of 1 μmol of pNPG to pNP and glucose per minute (μmol/min) under standard reaction conditions.

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Borosil Make-Sample Vials & Closures Wholesaler from 22mm Headspace GC Vials THE VIALSHeadspace 20ml GC Crimp Vials-Flat or Round BottomIn Headspace Chromatography the sealing of the Vial and its ability to withstand pressure are critical.Borosil Headspace Vials have a bevelled neck offering a superior and more secure seal The uniform thickness of the glass allows for even

Toward Standardized Photocatalytic Oxygen Evolution

Once the headspace purging was finished, the bubbling was started and the O 2 was monitored until the baseline was reached, after which the light was turned on (Newport, housed Xe lamp simulator). The irradiation condition is a standard ACB quality simulated AM 1.5G, 1-sun condition ( Figure S15 ).

INFLUENCE OF INNOCULUM ACCLIMATION IN THE

The vials were sealed with butyl rubber stoppers and the gas headspace flushed with N2/C02, followed by the addition of 0,1rnM of Na2S.9H20 as reducing agent. The vials were incubated at 37 C and the methane production was regularly measured by

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0.81 6.4 13.47 9 3.25 11.9 23.48 4.2699999999999996 0.47 20.9 34.17 6.7 8.1 17.5 0.46 4.8899999999999997 13.61 15.2 22.57 4.7699999999999996 0.25 5.6 0.5 7.2 0.19 14

The Performance of a reactor using photocatalysis to

result in a necessary 14.5 mL of headspace at the top of the flask to keep from losing solution out of that tube. A picture of the source tank is shown in Figure 10. The total volume of the system was a little over 1.5 L (4.5 L with the change in source tank) with 1.3

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Hydroxylation and Carboxylation—Two Crucial Steps of

Benzene is a highly toxic industrial compound that is essential to the production of various chemicals, drugs, and fuel oils. Due to its toxicity and carcinogenicity, much recent attention has been focused on benzene biodegradation, especially in the absence of molecular oxygen. However, the mechanism by which anaerobic benzene biodegradation occurs is still unclear. This is because until the