JY/T 0072-2011Monocotyledon stem (English PDF)

Foreword

This standard was drafted in accordance with the rules given in GB/T 1.1-2009 "Guidelines for Standardization Work_Part 1. Structure and Preparation of Standards" this standard replaces JY 72-1982 "Technical Conditions for Monocotyledon Stem Transect". In addition to editorial changes, the main technical changes are as follows.

-Elimination of "slice thickness within 25 µm" which is difficult to inspect;

-Cancel the classification of the original qualified products into first-class products and second-class products.

Please note that some elements of this standard may involve patents. The issuer of this standard is not responsible for identifying these patents.

This standard was proposed by the National Technical Committee for Standardization of Teaching Instruments (SAC/TC125).

This standard is under the jurisdiction of the National Technical Committee for Standardization of Teaching Instruments (SAC/TC125).

Standard JY 72-1982 drafting unit. Wuhan Teaching Instrument Factory.

The main drafter of standard JY 72-1982. Liu Yiqin.

This standard was drafted. Teaching Instrument Research Institute of the Ministry of Education.

1 Scope

This standard specifies the type designation, requirements, test methods, inspection rules and signs, instructions, packaging, Transportation and storage.

This standard applies to cross-section slide specimens of monocotyledonous stems for teaching in primary and secondary schools.

2 Normative references

The following documents are essential for the application of this document. For dated references, only the dated version applies to this article Pieces. For undated references, the latest version (including all amendments) applies to this document.

JY 0026 -1991 teaching instrument and teaching equipment product model naming method JY/T 0067 -2011 General requirements for biological slide specimens

3 Model designation

4 Requirements

4.1 Slides and coverslips, appearance, specimen collection and processing, specimen staining, and specimen covers should comply with JY/T 0067-2011 Chapter 4.

4.2 Specimens should be obtained from artificially cultivated corn stalks and internodes.

4.3 The epidermis, cortex, mechanical tissue, scattered vascular bundles and thin-walled tissue should be visible.

4.4 The epidermis is a layer of neatly arranged cells with a circle of mechanical tissue beneath the epidermis.

4.5 The cross-section should be perpendicular to the longitudinal axis, and the inclination of each cell should not exceed 1/3 of the stem.

4.6 Specimens are stained with crocus and solid green, or other multiple staining methods. Mechanical tissues, xylem ducts, and other tissue structures should be distinguished.

obvious.

4.7 Local thin-walled tissue cells should not shrink or break more than 1/3 of the stem.

4.8 Tissues other than parenchyma cells should not be damaged more than two places.

5 Test method

5.1 In accordance with the provisions of Chapter 5 of JY/T 0067-2011.

5.2 Specimens are examined at a microscope magnification of 100 times.

6 Inspection rules

6.1 Implementation of the provisions of Chapter 6 of JY/T 0067-2011.

6.2 In this standard, 4.3, 4.5, 4.6, 4.7, and 4.8 are the main performance indicators.

7 Signs, instructions, packaging, transportation and storage

Should comply with the relevant provisions of Chapter 7 of JY/T 0067-2011.