Occurrence of Casparian strips in the leaf endodermis of 10 genera of pinaceae;

Comparative study of Casparian strips in the roots and needles of Pinus armandi;

Being the thickening of the radial and transverse walls of endodermal cells, Casparian strips are important contents of research at home and abroad, which often focus on the research of its structure, chemical component, function and distribution.

Casparian strip was frequently regarded as a specific structure of tracheophyta, which appeared as a lignified and suberized narrow zone encircling the radial and transverse walls of the endodermal cells.

Comparison of the Kjeldahl Method and the Dumas Method for Total Nitrogen Determination in Grasses;

The protein content of 10 rice samples were determined by Kjeldahl determination method and biuret reaction analytical method separately.

This experiment tests the concentrion of proteins of the milk,the egg,the yogurt,the soybean milk,and the almond dew by the methods of Kjeldahl,i.

Determination of Kjeldahl nitrogen using Gerhardt device;

Objective: To establish a simple rapid method for determining Kjeldahl nitrogen content by 1st order differential coefficient single sweep polarography.

In the situation of recirculation of untreated and aerobically pretreated leachate, investigation was made on the variation regularity of ammonia nitrogen and Kjeldahl nitrogen in refuse landfill leachate.