percentage n. 1.【数学】百分法;百分数;百分比,百分率。 2.比例,部分。 3.【商业】手续费,佣金。 4.〔俚语〕赚头,不正当的利益;好处;用处。 5.(根据统计得出的)可能性。 no percentage in 〔美国〕没利益,没好处。 percentage of hits 【军事】命中率。 adv. -wise 从百分比来看,在百分比上。
meat n. 1.(食用)肉。 2.〔古语〕食物;〔古语〕餐。 3.(蛋、贝、果子等的)肉;(蟹、虾等的)肉。 4.(书的)内容,实质。 butcher's meat 家畜的肉。 white [light] meat 白肉〔指鸡等禽类胸脯肉〕。 red meat 红肉〔指牛肉、羊肉等〕。 dark meat 黑肉〔指烧不白的鸡(腿)肉〕。 green meat 青菜,蔬菜。 inside meat 可吃的内脏。 One man's meat is another man's poison. 利于甲者未必利于乙。 after meat , mustard 饭后上芥末,〔转义〕雨后送伞。 as full (of errors) as an egg is of meat (头脑等)充满了(错误);尽是(错误)。 be at meat 正在吃饭。 be meat and drink to 对(某人)是无上的乐趣。 be meat for sb.'s master 太好。 meat and potatoes 〔美俚〕重点,基础。 sit at meat 就席。 meat-and-potatoes adj. 〔美俚〕重要的,基本的。
Rlean meat percentage is one of the most important economic traints in pig breeding programs . myostatin is a negative regulator of skeletal muscle growth . null or low activity of myostatin , individual muscle of mutant amimals would show a large and widespread increase in skeletal mass . myostatin null animals have significantly larger diameter or more quantity of fiber skeletal muscle . the phenotype was termed double muscling . in order to probe the relation between myostatin and high lean meat rate and plump - hipped trait , we sythesized the c ' 80 amino acids coding sequence of porcine myostatin and costructed the cloning and expressing vector of it 肌生成抑制素( myostatin ,即mstn )是近几年来( mcpherrona . c等, 1997 )发现的骨骼肌生长的负调控因子,它主要在骨骼肌中表达。其活性的丧失,会引起动物肌肉的过度发育,肌纤维直径变大或肌纤维数增加,表现为双肌症状。肌生成抑制素研究的突破将对猪、肉鸡、肉牛等畜禽生产性能的提高具有特别重要的意义。