Cau 6: Tbay su ptrien cua vk (.) mtruong long va dac, ud thuc te

*Mtruong long:

-Co the do luong su ptrien cua vk theo tung thoi diem cua qtrinh ptrien

-(.) mtruong long vk ptrien theo 4 gdoan:

+Gdoan thich ung: 2h

+Gdoan ptrien: 10-12h (theo ham so mu)

+Gdoan toi da: 3-4h

+Gdoan suy tan: ung voi tinh trang ly giai cua vk. Luc do xuat hien nhung san fam doc do chuyen hoa (.) cac qtrinh ptrien

=>ud: (.) nuoi cay vk, muon thu dc 1 so luong lon vk thi thu hoach vao gdoan vk ptrien toi da, muon thu noi doc to vk thi thu hoach o gdoan suy tan

*Mtruong dac:

-Ctao hoa hoc cua mtruong dac jong mtruong long, chi khac la co them chat de ran lai ( qui luat ptrien (.) mtruong dac jong mtruong long nhung dinh luong de hon

-Khi ptrien (.) moi truong dac, tu 1 tb vk ban dau se ptrien thanh 1 dong vk co the nhin thay = mat, gom 10(6)-10(8) vk thuan khiet, jong nhau ve di truyen (khuan lac)

-co 3 dang khuan lac:

+Dang S: khuan lac xam nhat or trong, bo deu, mat loi deu, bong

+Dang M: khuan lac duc, tron loi hon khuan lac S, quanh or dinh

+Dangj R: khuan lac thuong det, bo deu or nhan nheo, mat xu xi, kho

=>Ud: khuan lac co gtri dinh huong chan doan vk:

Klac S (tu cau, lien cau, E.Coli) va M (Klebisiella...) thuoc nhung loai vk co vo hay co KN vo or KN be mat, thuong gay benh

Klac R thuong k gay benhk, tru 1 so l ngoai le (lao, than ...) klac R la nhung vk k vo va noi chung mat KN vo hay KN be mat