Activity andstability of immobilized glucoamylase and penicillin acylase were studied.是什么意思？

Activity andstability of immobilized glucoamylase and penicillin acylase were studied.

本文着重论述了两大类固定化酶载体的合成及其分别用于固定糖化型淀粉酶和青霉素酰化酶的研究.

activity

n. 活动，活跃，敏捷，活动力，教育活动；

例句
Budding linguists can tune in to the activity cassettes in French, German, Spanish and Italian.
崭露头角的语言学家们可以收听法语、德语、西班牙语和意大利语的活动磁带。

of

prep. 关于，属于…的，由…制成；aux. 助动词 [非标准用语、方言] =have [主用于虚拟语气]；

例句
He did have a real knowledge of the country...
他对该国的确知之甚多。

immobilized

v. 使不动，使固定( immobilize的过去式和过去分词 )；

例句
The knee and ankle joints must be immobilized — this usually means up to six weeks in plaster.
膝关节和踝关节必须加以固定——这通常意味着要打上 6 个星期的石膏。

glucoamylase

n. 葡糖淀粉酶，葡糖糖化酶；

例句
Activity andstability of immobilized glucoamylase and penicillin acylase were studied.
本文着重论述了两大类固定化酶载体的合成及其分别用于固定糖化型淀粉酶和青霉素酰化酶的研究.

and

conj. 和，与，而且，于是，然后，因此；

例句
I spend a lot on expensive jewelry and clothing...
我花很多钱购买昂贵的首饰和衣服。

penicillin

n. 青霉素，盘尼西林；

例句
One dose of penicillin can wipe out the infection.
一剂青霉素就能消除感染。

were

be的过去时复数和第二人称单数形式，有时代替 was,用于条件从句、动词 wish 之后等；

例句
Shops, houses, and vehicles were set ablaze.
店铺、房子和车辆全都陷于火海。

studied

adj. 有计划的，故意的，深思熟虑的，精通的；v. 学习，研究( study的过去式和过去分词 )，想出，详细地检查，背诵（台词等）；

例句
At college he studied English and did amateur boxing.
大学时，他学习英语，同时还参加业余拳击。