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Penicillinase and β-lactamase
Penicillinase is a specific type of β-lactamase, showing specificity for penicillins, again by hydrolysing the beta-lactam ring.

was and first
But her prettiness was what he had noticed first, and all the other things had come afterward: cruelty, meanness, self-will.
There was an artificial lake just out of sight in the first stand of trees, fed by a half dozen springs that popped out of the ground above the hillside orchard.
The first part of the road was steep, but it leveled off after the second bend and curled gradually into the valley.
No one was behind it, but in the rear wall of the office I noticed, for the first time, a door which had been left partially open.
The herd was watered and then thrown onto a broad grass flat which was to be the first night's bedground.
Once again, Tom Horn was the first and most likely suspect, and he was brought in for questioning immediately.
For Matilda, it was the first she had known in many a night.
Even the knowledge that she was losing another boy, as a mother always does when a marriage is made, did not prevent her from having the first carefree, dreamless sleep that she had known since they dropped down the canyon and into Bear Valley, way, way back there when they were crossing those other mountains.
Stevens was grunting over the last empty pocket when Russ abruptly rose and lunged toward Carmer's hat, which had tumbled half-a-dozen feet away when he first fell.
The Indian's arm whipped sidewise -- there was a flash of amber and froth, the crash of the bottle shattering against the side of the first car.
It was her first smile.
At first, I thought he was out of his head, talking wildly like this.
Hell, I gave him the first decent job he ever had, six, seven -- how many years ago was it, Rob ''??
Miss Langford ( her first name was Evelyn ) was an attractive girl.
School began in August, the hottest part of the year, and for the first few days Miss Langford was very lenient with the children, letting them play a lot and the new ones sort of get acquainted with one another.
It was just as well that the ignorant Dandy enjoyed himself to the hilt that first evening, for the room was to become his prison cell.
`` Bastards '', he would say, `` all I did was put a beat to that Vivaldi stuff, and the first chair clobbered me ''!!
In 1961 the first important legislative victory of the Kennedy Administration came when the principle of national responsibility for local economic distress won out over a `` state's-responsibility '' proposal -- provision was made for payment for unemployment relief by nation-wide taxation rather than by a levy only on those states afflicted with manpower surplus.
The first systematic thinking about this Pandora's box within Pandora's boxes was done four years ago by Fred Ikle, a frail, meek-mannered Swiss-born sociologist.
The smell at first was more surprising than unpleasant.
His collaboration with Washington, begun when he was the general's aide during the Revolution, was resumed when he entered the first Cabinet as Secretary of the Treasury.

was and be
The easiest thing would be to sell out to Al Budd and leave the country, but there was a stubborn streak in him that wouldn't allow it.
He didn't think it was possible for this couple to be pretending.
Evidently this was a precaution so that mounts would be available in an emergency.
He might tell her how sorry a spectacle she was making of herself, pretending to be blind to the way Julia Fortune had taken Dean's affections from her.
It was pitiful to see the thin ranks of warriors, old and young, wheeling and twisting their ponies frantically from side to side only to be tumbled bleeding from their saddles by the relentless slam, slam of the cruelly efficient Hawkinses.
The coyote was calling again, and he hoped that this time there would be no other sounds to interrupt it.
Its front was windowless, but irregularities in the masonry might be an indication that windows, now blinded, had once looked out upon the street.
She regarded them as signs that she was nearing the glen she sought, and she was glad to at last be doing something positive in her unenunciated, undefined struggle with the mountain and its darkling inhabitants.
Having persisted too long in deliberate ignorance and denial of the forces that threatened her, Pamela was relieved now to admit their potency and to be taking definite steps toward grappling with them.
she must be poised and proud and unafraid in order to prove to the mountain that she was in earnest.
There was a peculiar density about it, a thick substance that could be sensed but never identified, never actually perceived.
It was to be nothing more than that.
There was to be no gunplay.
If you don't leave this country within 3 days, your life will be taken the same as Powell's was.
Probably his horse would be close to where he was hiding.
Carmer himself was nowhere to be seen.
There was a feeling that this mission would be canceled like all the others and that this muddy wet dark world of combat would go on forever.
Visibility continued to be limited, and Greg was never able to get above a thousand feet.
It was going to be dangerous.
Forced to realize that this was the end of a very short line I scanned a road marker and discovered what the end of a slightly longer line would be for the old Mexican: Moriarty, New Mexico.
Over the rapidly-diminishing outline of a jump seat piled high with luggage Herry's black brushcut was just discernible, near, or enviably near that spot where -- hidden -- more delicately-textured, most beautifully tinted hair must still be streaming back in cool, oh cool wind sweetly perfumed with sagebrush and yucca flowers and engine fumes.
Mrs. Roebuck thought Johnson was a `` sweet bawh t'lah lahk thet '', but her Herman was getting to be a man, there was no getting around it.

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