【研究】Poly-β-hydroxybutyrate

Poly-β-hydroxybutyrate (PHB) increases growth performance 

and intestinal bacterial range-weighted richness in juvenile 

European sea bass, Dicentrarchus labrax

**文章出處：APPLIED MICROBIAL AND CELL PHYSIOLOGY,

 (2010) 86:1535–1541, Abstract

**作者：Peter De Schryver & Amit Kumar Sinha & Prabesh Singh 

Kunwar & Kartik Baruah & Willy Verstraete & Nico Boon &

 Gudrun De Boeck & Peter Bossier

**內文：

The bacterial storage polymer poly-β-hydroxybutyrate (PHB) has 

the potential to be used as an alternative anti-infective strategy

 for aquaculture rearing. In this research, the effects of (partially)

 replacing the feed of European sea bass juveniles with PHB were

investigated.

During a 6-week trial period, the PHB showed the ability to act

 as an energy source for the fish. This indicated that PHB was 

degraded and used during gastrointestinal passage. The gut pH 

decreased from 7.7 to 7.2 suggesting that the presence of PHB in

the gut led to the increased production of (short-chain fatty) acids.

The diets supplemented with 2% and 5% PHB (w/w) induced a

 gain of the initial fish weight with a factor 2.4 and 2.7, 

respectively, relative to a factor 2.2 in the normal feed treatment

. Simultaneously, these treatments showed the highest bacterial 

range weighted richness in the fish intestine. Based on molecular 

analysis, higher dietary PHB levels induced larger changes in the

 bacterial community composition. From our results it seems that

 PHB can have a beneficial effect on fish growth performance and

 that the intestinal bacterial community structure may be closely 

related to this phenomenon.

**中譯概述：

PHB是微生物中儲存碳能的一種方式，在文章中，作者嘗試使

用PHB作為魚類在幼年時期的餵食飼料之一，藉以觀察幼魚的

變化情形。

文中以飼養六週後的魚種做檢測，發現這個PHB經過降解後產

生的能量能改變幼魚的腸胃道系統，包括pH值以及腸道菌落

的生態改變。以及腸道內的短鏈脂肪酸形成。

後面就有點在喇賽，主要是希望PHB有潛力作為魚類幼年期時

的混合飼料，2-3％的PHB可以提供幼魚在文中許多好處，又

可以把魚餵飽飽，諸如此類。

**單字與片語：

1.重要單字

(1)    Alternative：另類、選擇性的。

(2)    Rearing：名詞rear指後面，作為動詞則有飼養的意思。

(3)    Investigated：調查、研究。

(4)    Trial：文中應該是扮演形容詞，有測試的意思，名詞則是

考驗。

(5)    Simultaneously：副詞，同時的意思。

(6)    Dietary：飲食，但文中我會翻成食用。

(7)    Beneficial：有益的。

2.補充單字

(1)   Poly-β-hydroxybutyrate：翻了我反而不知道是什麼東西，

他是一種短鍊碳結構，側枝接甲基，是種生物可分解性的塑膠。

(2)    Seabass：學名Dicentrarchus labrax，鱸魚，好吃…。

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