A rapid method for nitrogen determination in plant tissue

1970 ◽  
Vol 1 (2) ◽  
pp. 109-114 ◽  
Author(s):  
Myron H. Warner ◽  
J. Benton Jones
2020 ◽  
Vol 11 ◽  
Author(s):  
Da Cao ◽  
Francois Barbier ◽  
Kaori Yoneyama ◽  
Christine A. Beveridge
Keyword(s):  

1980 ◽  
Vol 65 (3) ◽  
pp. 523-525 ◽  
Author(s):  
Kerry T. Hubick ◽  
David M. Reid

Science ◽  
1942 ◽  
Vol 96 (2503) ◽  
pp. 565-566 ◽  
Author(s):  
R. C. LINDNER ◽  
C. P. HARLEY
Keyword(s):  

Author(s):  
Russell L. Steere ◽  
Eric F. Erbe

It has been assumed by many involved in freeze-etch or freeze-fracture studies that it would be useless to etch specimens which were cryoprotected by more than 15% glycerol. We presumed that the amount of cryoprotective material exposed at the surface would serve as a contaminating layer and prevent the visualization of fine details. Recent unexpected freeze-etch results indicated that it would be useful to compare complementary replicas in which one-half of the frozen-fractured specimen would be shadowed and replicated immediately after fracturing whereas the complement would be etched at -98°C for 1 to 10 minutes before being shadowed and replicated.Standard complementary replica holders (Steere, 1973) with hinges removed were used for this study. Specimens consisting of unfixed virus-infected plant tissue infiltrated with 0.05 M phosphate buffer or distilled water were used without cryoprotectant. Some were permitted to settle through gradients to the desired concentrations of different cryoprotectants.


Author(s):  
M. D. Vaudin ◽  
J. P. Cline

The study of preferred crystallographic orientation (texture) in ceramics is assuming greater importance as their anisotropic crystal properties are being used to advantage in an increasing number of applications. The quantification of texture by a reliable and rapid method is required. Analysis of backscattered electron Kikuchi patterns (BEKPs) can be used to provide the crystallographic orientation of as many grains as time and resources allow. The technique is relatively slow, particularly for noncubic materials, but the data are more accurate than any comparable technique when a sufficient number of grains are analyzed. Thus, BEKP is well-suited as a verification method for data obtained in faster ways, such as x-ray or neutron diffraction. We have compared texture data obtained using BEKP, x-ray diffraction and neutron diffraction. Alumina specimens displaying differing levels of axisymmetric (0001) texture normal to the specimen surface were investigated.BEKP patterns were obtained from about a hundred grains selected at random in each specimen.


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