题干

硅酸盐细菌可以将土壤中不溶性的含钾矿物(如长石、云母)以及磷灰石等分解转化,释放出水溶性的钾、磷,将土壤中的无效磷钾转化为速效养分.现代工业可将硅酸盐细菌制成细菌肥料,达到增产目的.硅酸盐细菌在无氮培养基、钾细菌培养基以及硅酸盐细菌培养基上均能生长,如表1是硅酸盐细菌培养基的一种配方.

回答下列问题:

表1:

硅酸盐细菌培养基的一种配方

葡萄糖

10.0 g

MgSO4•7H2O

0.2g

CaCO3

0.2g

K2HPO4

2.0g

NaCl

0.2g

K2SO4

0.2g

琼脂

20.0g

将上述物质溶解后,用蒸馏水定溶至1000mL

表2:

培养基种类

各稀释度对应的平均菌落数

菌落直径

(mm)

103

104

103

104

无氮培养基

32

3

2

0

1.0~2.0

钾细菌培养基

36

6

4

0.6

多数小于1.5

硅酸盐细菌培养基

50

8

5

1.2

多数大于2.0

上一题 下一题 0.0难度 选择题 更新时间:2018-08-17 03:48:50

答案(点此获取答案解析)

同类题4

阅读理解

    What's On?

    Electric Underground

    7.30p.m. —1.00a.m.        Free at the Cyclops Theatre

    Do you know who's playing in your area? We're bringing you an evening of live rock and pop music from the best local bands. Are you interested in becoming a musician and getting a recording contract (合同)? If so, come early to the talk at 7.30pm by Jules Skye, a successful record producer. He's going to talk about how you can find the right person to produce you music.

    Gee Whizz

    8.30p.m.—10.30p.m.        Comedy at Kaleidoscope

    Come and see Gee Whizz perform. He's the funniest stand-up comedian on the comedy scene. This joyful show will please everyone, from the youngest to the oldest. Gee Whizz really knows how to make you laugh! Our bar is open from 7.00pm for drinks and snacks (快餐).

    Simon's Workshop

    5.00p.m.—7.30p.m.        Wednesdays at Victoria Stage

    This is a good chance for anyone who wants to learn how to do comedy. The workshop looks at every kind of comedy, and practices many different ways of making people laugh. Simon is a comedian and actor who has 10 years' experience of teaching comedy. His workshops are exciting and fun. An evening with Simon will give you the confidence to be funny.

    Charlotte Stone

    8.00p.m.—11.00p.m.        Pizza World

    Fine food with beautiful jazz music; this is a great evening out. Charlotte Stone will perform songs from her new best-selling CD, with James Pickering on the piano. The menu is Italian, with excellent meat and fresh fish, pizzas and pasta (面食). Book early to get a table. Our bar is open all day, and serves cocktails, coffee, beer, and white wine.