人的記憶力會(huì)隨著歲月的流逝而衰退，寫作可以彌補(bǔ)記憶的不足，將曾經(jīng)的人生經(jīng)歷和感悟記錄下來(lái)，也便于保存一份美好的回憶。寫范文的時(shí)候需要注意什么呢？有哪些格式需要注意呢？下面是小編為大家收集的優(yōu)秀范文，供大家參考借鑒，希望可以幫助到有需要的朋友。

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new neurons stop growing in a key region of the brain’s ’memory center’ as early as 13 years old, according to a controversial new study.

一項(xiàng)有爭(zhēng)議的新研究顯示，早在人類13歲時(shí)，大腦“記憶中心”一個(gè)關(guān)鍵區(qū)域的新神經(jīng)細(xì)胞就停止生長(zhǎng)了。

scientists looking at brain tissue samples found no evidence of new nerve cell growth in the dentate gyryus, a part of the hippocampus vital to memory formation, after the age of 13.

研究腦組織樣本的科學(xué)家沒(méi)有發(fā)現(xiàn)人類在13歲后齒狀回中有新神經(jīng)細(xì)胞生長(zhǎng)的證據(jù)。齒狀回是海馬區(qū)的一個(gè)部分。海馬區(qū)對(duì)于記憶的形成至關(guān)重要。

the discovery contradicts previous findings suggesting that hippocampal neurons replenish themselves throughout adulthood, as they do in many other mammals.

該結(jié)論同先前的發(fā)現(xiàn)相左。以往研究顯示，人類大腦海馬區(qū)的神經(jīng)元在整個(gè)成年時(shí)期都會(huì)不斷自我補(bǔ)充，就像很多其他哺乳動(dòng)物一樣。

the newly found pattern seems to be a hallmark of big complex brains.

這種新發(fā)現(xiàn)似乎顯示了復(fù)雜大腦的特征。

new hippocampus neuron development also dwindled over time in macaque monkeys, the scientists found. and hippocampus regeneration was thought to be lacking in big-brained dolphins, porpoises and whales.

科學(xué)家發(fā)現(xiàn)，在獼猴身上，新海馬神經(jīng)元生長(zhǎng)也會(huì)隨時(shí)間減弱。科學(xué)家認(rèn)為，在有著大型腦的海豚和鯨中間，也缺少海馬神經(jīng)元再生的情況。

writing in the journal nature, the authors led by dr arturo alvarez-buylia, from the university of california at san francisco, concluded: ’neurogenesis in the dentate gyrus does not continue, or is extremely rare, in adult humans.

該研究由加利福尼亞大學(xué)舊金山分校的阿圖羅?阿爾瓦雷斯-拜利亞博士領(lǐng)導(dǎo)，發(fā)表在英國(guó)《自然》周刊上。他總結(jié)道，“在成年人中，齒狀回中的神經(jīng)元再生不會(huì)繼續(xù)，或極其稀少。”

the early decline in hippocampal neurogenesis raises questions about how the function of the dentate gyrus differs between humans and other species in which adult hippocampal neurogenesis is preserved.’

“海馬區(qū)神經(jīng)再生的早期衰退提出了人類和其他物種之間齒狀回功能如何不同的問(wèn)題。其他物種在成年期仍可再生海馬神經(jīng)元?！?/p>

the scientists used marker antibodies to ’flag up’ neural precursor cells and immature neurons in 59 human brain tissue samples.

科學(xué)家們使用標(biāo)記抗體來(lái)“指示”59個(gè)人類腦組織樣本中的神經(jīng)前體細(xì)胞和不成熟神經(jīng)元。

the post-mortem and post-surgery samples spanned all life stages from the foetus to older adulthood.

這些死后和手術(shù)后獲得的樣本橫跨從胎兒到老年的所有生命階段。

the number of developing neurons in the dentate gyrus reduced with age and the oldest sample in which any were found was from a 13-year-old. no young neurons were detected in samples from people aged 18 to 77.

在齒狀回中，生長(zhǎng)中的神經(jīng)元數(shù)量會(huì)隨年齡增長(zhǎng)而減少。包含生長(zhǎng)中神經(jīng)元的最老樣本來(lái)自一個(gè)13歲的人。從18到77歲的'人的腦樣本中沒(méi)有發(fā)現(xiàn)年輕的神經(jīng)元。

the scientists added: ’interestingly, a lack of neurogenesis in the hippocampus has been suggested for aquatic mammals (dolphins, porpoises and whales), species known for their large brains, longevity and complex behaviour.’

科學(xué)家還說(shuō)：“有趣的是，水棲哺乳動(dòng)物(海豚和鯨)的海馬體也缺乏神經(jīng)元再生現(xiàn)象。這些物種以大規(guī)模的腦、長(zhǎng)壽和復(fù)雜行為而聞名?！?/p>

previous studies may have wrongly reported the detection of immature hippocampal neurons because the marker proteins used to disclose them do not work the same way in humans and animals, said the researchers.

研究人員說(shuō)，過(guò)去的研究可能錯(cuò)誤報(bào)道了不成熟海馬神經(jīng)元的發(fā)現(xiàn)，因?yàn)橛糜谥甘舅鼈兊臉?biāo)記蛋白質(zhì)在人類和動(dòng)物身上以不同方式工作。

in an accompanying news & views commentary, dr jason snyder from the university of british columbia, canada, wrote: ’these findings are in stark contrast to the prevailing view that human hippocampal neurogenesis extends throughout adult life.’

加拿大英屬哥倫比亞大學(xué)的杰森斯奈德博士在一篇相關(guān)的新聞與觀察評(píng)論中寫道：“這些發(fā)現(xiàn)與人們普遍認(rèn)為的人類海馬神經(jīng)發(fā)生貫穿成年期的觀點(diǎn)形成了鮮明的對(duì)比?！?/p>s("content_relate");

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