A Rapid Chemical Field Test for Archaeological Site Surveying

1973 ◽  
Vol 38 (2) ◽  
pp. 206-210 ◽  
Author(s):  
Robert C. Eidt
Keyword(s):  
Field Test ◽  
Archaeological Site ◽  
Field Method ◽  
Spot Test ◽  
Efficient Technique ◽  
Relative Duration ◽  
Soil Phosphate

AbstractA simple and inexpensive qualitative chemical field method, or spot test, is described for ascertaining the presence of enriched soil phosphate. The spot test is an efficient technique for rapid archaeological site surveying, for elimination of guesswork in establishing trench lines, and for creating phosphate maps depicting type, extent, and relative duration of abandoned settlement features.

Quantitative phosphorus measurement: A field test procedure for archaeological site analysis at Piedras Negras, Guatemala

2000 ◽  
Vol 15 (2) ◽  
pp. 151-166 ◽  
Author(s):  
Richard E. Terry ◽  
Sheldon D. Nelson ◽  
Jared Carr ◽  
Jacob Parnell ◽  
Perry J. Hardin ◽  
...  
Keyword(s):  
Field Test ◽  
Test Procedure ◽  
Archaeological Site ◽  
Site Analysis ◽  
Piedras Negras

USE OF THE FIELDES AND PERROTT SODIUM FLUORIDE TEST TO DISTINGUISH THE B HORIZONS OF PODZOLS IN THE FIELD

1970 ◽  
Vol 50 (1) ◽  
pp. 35-41 ◽  
Author(s):  
J. E. BRYDON ◽  
J. H. DAY
Keyword(s):  
Field Test ◽  
Sodium Fluoride ◽  
Narrow Range ◽  
Spot Test ◽  
Positive Test ◽  
Test Plate ◽  
Specific Test ◽  
Ph Values ◽  
Extractable Al

The Fields and Perrott test, originally devised as a test for allophane, has been shown to give a positive test with soil materials having reactive Al(OH)x. This includes the Bf horizon of Podzols. In the test, a drop of saturated NaF solution is added to approximately 10 mg of soil on a spot test plate. After 2 min, the pH of the suspension, as measured with narrow range pH paper, divided a variety of B horizons into two groups. The Bf horizons gave pH values above 10.3 whereas Bm, Bg or Bt horizons all yielded pH values below 10.2 with this field test. The C horizons of a number of Podzols yielded a variety of pH values but the values were all low in the Ae and high in the B horizons. This grouping was found to be a funtion of the content of oxalate-extractable Al. Ground gibbsite, amorphous Al(OH)3, allophane, synthetic dioctahedral chlorite and Bf horizons which had greater than 1% oxalate-extractable Al yielded pH values in 1 M NaF solution of 11.0 or higher. Therefore, the Fieldes and Perrott test cannot be considered as a specific test for allophane.

Evaluation of the dark field method for large association of spread DNA

1978 ◽  
Vol 36 (2) ◽  
pp. 190-191
Author(s):  
Douglas C. Barker
Keyword(s):  
Electron Microscopy ◽  
Molecular Weight ◽  
Mitochondrial Dna ◽  
Extraction Method ◽  
Field Method ◽  
Dark Field ◽  
Kinetoplast Dna ◽  
Field Electron ◽  
Field Electron Microscopy ◽  
Dark Field Electron

A number of satisfactory methods are available for the electron microscopy of nicleic acids. These methods concentrated on fragments of nuclear, viral and mitochondrial DNA less than 50 megadaltons, on denaturation and heteroduplex mapping (Davies et al 1971) or on the interaction between proteins and DNA (Brack and Delain 1975). Less attention has been paid to the experimental criteria necessary for spreading and visualisation by dark field electron microscopy of large intact issociations of DNA. This communication will report on those criteria in relation to the ultrastructure of the (approx. 1 x 10-14g) DNA component of the kinetoplast from Trypanosomes. An extraction method has been developed to eliminate native endonucleases and nuclear contamination and to isolate the kinetoplast DNA (KDNA) as a compact network of high molecular weight. In collaboration with Dr. Ch. Brack (Basel [nstitute of Immunology), we studied the conditions necessary to prepare this KDNA Tor dark field electron microscopy using the microdrop spreading technique.

A Many-Beam Technique for Enhanced Resolution of Partial Dislocations

1972 ◽  
Vol 30 ◽  
pp. 646-647
Author(s):  
J. M. Oblak ◽  
B. H. Kear
Keyword(s):  
Phase Shift ◽  
Field Method ◽  
Dark Field ◽  
Bright Field ◽  
Field Technique ◽  
Weak Beam ◽  
Partial Dislocations ◽  
Enhanced Resolution ◽  
Nickel Base ◽  
Beam Technique

The “weak-beam” and systematic many-beam techniques are the currently available methods for resolution of closely spaced dislocations or other inhomogeneities imaged through strain contrast. The former is a dark field technique and image intensities are usually very weak. The latter is a bright field technique, but generally use of a high voltage instrument is required. In what follows a bright field method for obtaining enhanced resolution of partial dislocations at 100 KV accelerating potential will be described.A brief discussion of an application will first be given. A study of intermediate temperature creep processes in commercial nickel-base alloys strengthened by the Ll2 Ni3 Al γ precipitate has suggested that partial dislocations such as those labelled 1 and 2 in Fig. 1(a) are in reality composed of two closely spaced a/6 <112> Shockley partials. Stacking fault contrast, when present, tends to obscure resolution of the partials; thus, conditions for resolution must be chosen such that the phase shift at the fault is 0 or a multiple of 2π.

Characterization of machined polystyrene foam

1989 ◽  
Vol 47 ◽  
pp. 372-373
Author(s):  
C. W. Price ◽  
E. F. Lindsey ◽  
R. M. Franks ◽  
M. A. Lane
Keyword(s):  
Surface Finish ◽  
Cell Walls ◽  
Surface Structures ◽  
Efficient Technique ◽  
Low Density ◽  
Polystyrene Foam ◽  
Planar Surfaces ◽  
Machining Characteristics

Diamond-point turning is an efficient technique for machining low-density polystyrene foam, and the surface finish can be substantially improved by grinding. However, both diamond-point turning and grinding tend to tear and fracture cell walls and leave asperities formed by agglomerations of fragmented cell walls. Vibratoming is proving to be an excellent technique to form planar surfaces in polystyrene, and the machining characteristics of vibratoming and diamond-point turning are compared.Our work has demonstrated that proper evaluation of surface structures in low density polystyrene foam requires stereoscopic examinations; tilts of + and − 3 1/2 degrees were used for the stereo pairs. Coating does not seriously distort low-density polystyrene foam. Therefore, the specimens were gold-palladium coated and examined in a Hitachi S-800 FESEM at 5 kV.

Field test for environmental correlates of dispersal in hedgehogs Erinaceus europaeus

2001 ◽  
Vol 70 (1) ◽  
pp. 33-46 ◽  
Author(s):  
Doncaster C. Patrick ◽  
Rondinini Carlo ◽  
Johnson Paul C. D.
Keyword(s):  
Field Test ◽  
Erinaceus Europaeus ◽  
Environmental Correlates

A specific spot test for iron

1960 ◽  
Vol 23 ◽  
pp. 225-226 ◽  
Author(s):  
K LALMALLIK ◽  
B SEN
Keyword(s):  
Spot Test
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