scholarly journals A simple method for sampling total dissolved carbonate in carbonate-rich natural waters and CO2 preparation for .DELTA.13C determination.

2001 ◽  
Vol 35 (6) ◽  
pp. 459-464 ◽  
Author(s):  
Minoru Kusakabe
Keyword(s):  
Natural Waters ◽  
Simple Method

Simple Method to Determine the Apparent Quantum Yield Matrix of CDOM Photobleaching in Natural Waters

2020 ◽  
Vol 54 (21) ◽  
pp. 14096-14106
Author(s):  
Xiaohui Zhu ◽  
William L. Miller ◽  
Cédric G. Fichot
Keyword(s):  
Quantum Yield ◽  
Natural Waters ◽  
Apparent Quantum Yield ◽  
Simple Method

A simple method for simultaneous determination of acetaldehyde, acetone, methanol, and ethanol in the atmosphere and natural waters

2017 ◽  
Vol 9 (19) ◽  
pp. 2915-2922 ◽  
Author(s):  
Fernanda F. Giubbina ◽  
Caroline Scaramboni ◽  
Bruno S. De Martinis ◽  
Daniely Godoy-Silva ◽  
Raquel F. P. Nogueira ◽  
...  
Keyword(s):  
Simultaneous Determination ◽  
Natural Waters ◽  
Ethanol Fuel ◽  
Simple Method ◽  
Associated Species

Despite the increasing use of ethanol fuel, there is a great scarcity of data on the abundance of this alcohol and associated species in the atmosphere and natural waters.

A simple method for determination of corexit 9527® in natural waters

1991 ◽  
Vol 31 (1) ◽  
pp. 69-78 ◽  
Author(s):  
Genine M. Scelfo ◽  
Ronald S. Tjeerdema
Keyword(s):  
Natural Waters ◽  
Simple Method

A simple method for assaying extracellular hydroxyl radical activity and its application to natural and synthetic waters

2003 ◽  
Vol 60 (2) ◽  
pp. 203-213 ◽  
Author(s):  
L A Molot ◽  
S A Miller ◽  
P J Dillon ◽  
C G Trick
Keyword(s):  
Hydroxyl Radical ◽  
Natural Waters ◽  
Culture Media ◽  
Cyanobacterial Bloom ◽  
Order Rate Constant ◽  
Photochemical Oxidation ◽  
Algal Culture ◽  
Simple Method ◽  
Oxidation Rates ◽  
Lake Waters

An assay has been developed to measure extracellular hydroxyl radical (OH*) activity in algal culture media and natural waters over a 4- to 5-day period. The first-order rate constant, k, for loss of absorbance at 590 or 620 nm was determined for erioglaucine, which is sensitive to OH*, insensitive to superoxide and hydrogen peroxide, and stable in the dark and under artificial radiation (280–750 nm) and solar radiation in the absence of oxidants. Variation in irradiance was accounted for by normalizing k with k for a ferric iron reference solution with dye (k/kfe). Trends in k/kfe for streams and lakes were consistent with previous data on photochemical oxidation rates of dissolved organic matter. Values for k/kfe were similar in filtered surface waters of eutrophic Heart Lake and nearby mesotrophic Lake St. George under artificial radiation. Hence, extracellular OH* did not appear to be a direct cause of the onset of a nuisance cyanobacterial bloom in Heart Lake, nor did OH* appear related to the absence of a bloom in Lake St. George. k/kfe was two orders of magnitude higher in algal culture media supplied with 8.8 mM nitrate than in lake waters.

A simple method for the detection of low concentration of viruses in large volumes of water by the membrane filter technique

1969 ◽  
Vol 15 (5) ◽  
pp. 399-403 ◽  
Author(s):  
N. U. Rao ◽  
N. A. Labzoffsky
Keyword(s):  
Surface Water ◽  
Natural Waters ◽  
Membrane Filter ◽  
Field Studies ◽  
Combination Method ◽  
Simple Method ◽  
Poliovirus Type ◽  
Low Concentrations ◽  
Virus Dose

A simple prefilter pad – membrane filter combination method is described for the detection and quantitation of low concentrations of virus in natural waters. The data obtained indicate that in surface water experimentally contaminated with poliovirus type 1 (Mahoney strain), more than 50% of the initial virus dose is recovered. The method is practical, efficient, and can be used in field studies. It was clearly demonstrated that the prefilter pad (AP25), when used by itself will adsorb viruses. A certain concentration of electrolytes (200 p.p.m. Ca2+) is necessary in water to prevent the loss of virus in filtrate when filtering is done through the membrane filter.

A simple way for producing holographic filters suitable for image improvement

1978 ◽  
Vol 36 (1) ◽  
pp. 226-227
Author(s):  
K.-H. Herrmann ◽  
E. Reuber ◽  
P. Schiske
Keyword(s):  
Transfer Functions ◽  
Diffraction Order ◽  
Lateral Position ◽  
Simple Method ◽  
Spatial Frequencies ◽  
Resolution Electron ◽  
Wiener Filters ◽  
Image Improvement ◽  
Optical Reconstruction ◽  
Set Up

Aposteriori deblurring of high resolution electron micrographs of weak phase objects can be performed by holographic filters [1,2] which are arranged in the Fourier domain of a light-optical reconstruction set-up. According to the diffraction efficiency and the lateral position of the grating structure, the filters permit adjustment of the amplitudes and phases of the spatial frequencies in the image which is obtained in the first diffraction order.In the case of bright field imaging with axial illumination, the Contrast Transfer Functions (CTF) are oscillating, but real. For different imageforming conditions and several signal-to-noise ratios an extensive set of Wiener-filters should be available. A simple method of producing such filters by only photographic and mechanical means will be described here.A transparent master grating with 6.25 lines/mm and 160 mm diameter was produced by a high precision computer plotter. It is photographed through a rotating mask, plotted by a standard plotter.

Rotary Beveling for In Situ Thin-Section Microscopy of Cell Cultures

1981 ◽  
Vol 39 ◽  
pp. 550-551
Author(s):  
Dean A. Handley ◽  
Jack T. Alexander ◽  
Shu Chien
Keyword(s):  
Cell Growth ◽  
Cell Cultures ◽  
Molecular Interactions ◽  
Convenient Method ◽  
Petri Dish ◽  
Simple Method ◽  
Thin Section Microscopy ◽  
Thin Sectioning ◽  
Organic Fluids

In situ preparation of cell cultures for ultrastructural investigations is a convenient method by which fixation, dehydration and embedment are carried out in the culture petri dish. The in situ method offers the advantage of preserving the native orientation of cell-cell interactions, junctional regions and overlapping configurations. In order to section after embedment, the petri dish is usually separated from the polymerized resin by either differential cryo-contraction or solvation in organic fluids. The remaining resin block must be re-embedded before sectioning. Although removal of the petri dish may not disrupt the native cellular geometry, it does sacrifice what is now recognized as an important characteristic of cell growth: cell-substratum molecular interactions. To preserve the topographic cell-substratum relationship, we developed a simple method of tapered rotary beveling to reduce the petri dish thickness to a dimension suitable for direct thin sectioning.

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