大象的嗅觉动物界最灵敏 Researchers have discovered that African Elephants have the largest number of genes dedicated to smell of any mammal. 研究人员发现,非洲大象拥有数量最多的基因,这些基因有利于所有哺乳动物的嗅觉。 Given the size of their trunks, and how important it is to their survival, it is probably unsurprising that an elephant s nose is not only the longest in the animal kingdom, but also the most effective. In comparison, humans and other primates have a poor sense of smell. The functions of these genes are not well known, but they are likely important for the living environment of African elephants, said author Dr Yoshihito Niimura of the University of Tokyo. Apparently, an elephant s nose is not only long but also superior. The sense of smell is critical to all mammals, and they use it for sniffing out food, avoiding predators, finding mates and locating their offspring. In a study published in Genome Research, scientists examined the 13 mammal species and found that African Elephants have twice the number of smell genes as dogs and five times more than humans. They have around 2,000 genes alone that are dedicated to scent. Humans in comparison have just under 400 and other primates like chimpanzees, even less. The study found that 20,000 genes are responsible for the sense of smell in mammals, of which around half are functional, but the collections differ for each species. Horses have around 1,000 smell genes, rabbits around 750 and rats about 1,200. The large repertoire of elephant genes might be attributed to elephants heavy reliance on scent in various contexts, including foraging, social communication, and reproduction, added Dr Niimura
2013最新考研英语大纲词汇
考研英语高频词汇
2016考研英语高频考点解题技巧 "搭配记忆"法(四)
2015考研英语时事分类词汇世界杯球队大巴车标语
2016考研英语高频考点解题技巧 "搭配记忆"法(三)
2015考研英语时事分类词汇足球词汇三
2016考研暑期复习时间管理黄金法则
考研英语常用同义词辨析必读--E
考研英语常用同义词辨析必读--D
故事烙印速记最新考研英语大纲词汇lesson02
考研英语高频词汇(23)
考研英语常用同义词辨析必读--B
故事烙印速记最新考研英语大纲词汇lesson03
考研英语高频词汇(22)
春天如此美好,你却在见周公?
提高考研英语写作分数常用词组
三招教英语“学渣”轻松过考研国家线
复试技巧之英语口语
2016考研英语高频考点解题技巧 "搭配记忆"法(二)
考研英语常用同义词辨析必读--A
2015考研英语时事分类词汇八零后玩过的游戏
2016考研英语高频考点解题技巧 "搭配记忆"法(十)
2013考研英语单词超强记忆大汇总
考研英语常用同义词辨析必读--C
2015考研英语时事分类词汇足球比赛技术统计词汇
考研英语常用同义词辨析必读--F
2016考研英语高频考点解题技巧 "搭配记忆"法(九)
2015考研英语时事分类词汇奥巴马亚洲行
2015考研英语时事分类词汇暴恐活动词汇
2016考研英语高频考点解题技巧 “搭配记忆"法(一)
不限 |
英语教案 |
英语课件 |
英语试题 |
不限 |
不限 |
上册 |
下册 |
不限 |