Identification method for rice varieties

Identification of rice varieties usually uses field identification and indoor identification combined with field surveys. (a) The main contents of the field survey field identification are purity, ripening period and main characteristics. The intrinsic characteristics of rice varieties (combinations) promoted and applied in production should be characterized by uniform and consistent characteristics in the field. Based on the above characteristics, different rice varieties can be identified and their purity can be identified. The purity of a variety is generally expressed by the number of plants (or the number of indoor test seeds) having the inherent characteristics of the species in the total number of investigated plants (or the total number of seeds in the indoor test). Field surveys can be conducted at five random sampling surveys at random and at the center of the field (excluding sidewalks). In addition to investigating the purity according to the characteristics of the varieties, the field survey can also check the purity according to the ripening period. The variety (combination) applied in production has a relatively stable growth period in specific regions, and the growth period of varieties (combinations) varies from year to year. Changes, but not much change, that is, during the normal sowing period, mature early-season rice varieties in certain regions will not become mature rice varieties in autumn or late-season mature varieties. (B) indoor identification indoor identification including seed identification and physical and chemical detection methods and quality identification method. Seed identification method can be used to identify different varieties based on the length of seed grains, the color of axillary tips, the presence or absence of awns, the weight of a thousand seeds, and the number of axillary hairs of different varieties. For example, the indica rice varieties have long, dense and difficult threshing, and the grain is short. Wide and thick, nearly circular cross-section; indica rice varieties short and thin, scattered enamel, easy to threshing, slightly flat rice. China Agricultural Network Editor

Orthopedic External Fixator

Orthopedic external fixation system

The screw orthopedic is inserted into the bone near the fracture, and the fracture is fixed with an external fixator assembled by a chuck and a nail rod.

Indications

open fracture, nonunion, closed fracture with extensive soft tissue injury, fracture with multiple trauma, osteotomy and correction.

The use of orthopaedic external fixators is currently a superior fracture fixation technique, filling the gap between cast and internal fixation. At the same time, orthopedic external fixator has the characteristics of simple fixation method, stable, reliable and effective, and does not limit the joint movement, can be early ambulation advantages. It can reduce the time for the operator and is more friendly to the user. The external fixator was used together with the bone traction needle. In terms of the classification of orthopedic external fixators, it is mainly divided into four types: orthofix type external fixation, ilizarov type external fixation, ao synthes type external fixation,combined external fixator and common external fixators.

The external fixators in orthopaedics was used for reduction (shortening and overlapping displacement were corrected first, then lateral and angular displacement were corrected, and finally rotational and separation displacement were corrected; If closed reduction is difficult, open reduction can be considered, but the separation of soft tissue and peeling of periosteum should be minimized.

The selection of the insertion site.According to the anatomical characteristics of the soft tissue at the insertion plane, the important nerves, vessels and tendons should be avoided; The ideal entry point is the part of the bone close to the subcutaneous, in a word, generally choose the skin and bone between the muscle soft tissue is the weakest point into the needle. The installation shall facilitate observation and control of soft tissue damage, and permit any surgery that may be required, such as repair and reconstruction, dressing change, skin grafting, or bone grafting." According to the location of the bone, different diameters of the threaded needle were selected. Removal was performed after completion of late treatment.

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