過度脅變 的英文怎麼說
中文拼音 [guòdùxiébiàn]
過度脅變
英文
overstrain-
Major threats to hawksbill turtle are habitat destruction and alternation by coastal development, over - exploitation for meat, hides, eggs and shells, and incidental capture in fisheries
玳瑁面對的主要脅包括沿岸發展的改變或生境的破壞，人類對肉蛋和殼而遭過度的采捕，以及遭漁民意外捕撈。We obtain two recessive monogenic salt - tolerance mutants from co60 - - mutagenized arabidopsis thaliana m2 populations. the effect of nacl on the structure of vegetative organa in arabidopsis thaliana was further studied and through a rapd analysis on salt - tolerance mutants of arabidopsis thaliana, a 1200bp dna fragment probably related to the salt - tolerance gene was get
本實驗以模式植物擬南芥（ arabidopsisthaliana ）為材料獲得了隱性單基因抗鹽突變體，並研究了不同濃度的nacl脅迫對擬南芥營養器官結構的影響，進而通過對突變體的rapd分析，獲得了一個與植物抗鹽性有關的1200bp大小的基因片段。With the acceleration of extinction of species, biodiversity conservation is extensively concerned. the extinction of species is concerned with the degree of threat by biotic and abiotic factors. so, taking action to preserve plant species is very necessary and paramount before their extinction. one of the most effective biological techniques to conserve the biodiversity is the establishment of genebanks, i. e. ex situ conservation. the elucidation of various factors that regulate seed viability and vigor in storage is essential. an ideal condition to prolong the longevity is mainly depended on seed water content, temperature, humidity and types of containers used during storage. the optimum stage of seed maturity, harvesting techniques and processing, in addition to physiological features such as degree of dormancy, also play key roles in seed storage. certainly, desiccated seeds deteriorate with time even under extremely good genebanking conditions. according to seed storage behavior, it is necessary to consider three principal factors : storage environment, storage duration and plant species which will affect seed survival under good genebanking conditions. the present review is an attempt to discuss the importance of the aforementioned aspects of seeds in detail in order to conserve plant germplasms ( especially wild rare and endangered plants ) for ex situ conservation through seed - gene bank
一個物種的滅絕是與其受生物因子和非生物因子的威脅程度相關的.隨著物種的加速絕滅，保護生物多樣性受到廣泛地關注.保護生物多樣性的最有效的生物技術之一是建立種子基因庫，進行遷地保護.種子庫理想的貯藏條件主要取決于種子含水量、貯藏環境（如溫度和濕度）和貯存種子的容器.進行種子貯藏，了解種子生命力和活力的影響因子的作用機理是十分重要和必要的.除了種子自身的生理特徵外，種子的貯藏壽命與種子成熟度、收獲技術、加工處理方法也是息息相關的.即使在最適的庫存條件下，種子也會隨時間發生劣變.因此，必須根據種子特定的貯藏行為，加以考慮影響種子存活的3個主要方面（貯藏環境、貯藏期和植物種類）而選擇有效的貯藏方案.本文試圖討論種子貯藏生理的幾個重要方面及其需解決的技術問題，以便更好地通過種子基因庫，長期有效地保存植物種質資源Abstract : plant responses to salt stress via a complex mechanism, including sensing and transducing the stress signal, activating the transcription factors and the corresponding metabolizing genes. since the whole mechanism is still unclear, this review emphasize the biochemical events during the plant adaptation to salt stress referring to an index of importance : the homeostasis in cytoplasm, the biosynthesis of osmolytes and the transport of water. most of these biochemical events were elucidated by study of halophyte and salt - sensitive mutations, also many important genes involved were cloned and used to generate stress - tolerance phenotypes in transgenic plants. on the other hand, about the molecular mechanism in signal transduction, the research of arabidopsis mutations and yeast functional complementation provided helpful traces but not full pathway
摘要植物對鹽脅迫的耐受反應是個復雜的過程，在分子水平上它包括對外界鹽信號的感應和傳遞，特異轉錄因子的激活和下游控制生理生化應答的效應基因的表達.在生化應答中，本文著重討論負責維持和重建離子平衡的膜轉運蛋白、滲調劑的生物合成和功能及水分控制.這些生理生化應答最終使得液泡中離子濃度升高和滲調劑在胞質中積累.近年來，通過對各種鹽生植物或鹽敏感突變株的研究，闡明了許多鹽應答的離子轉運途徑、水通道和物種特異的滲調劑代謝途徑，克隆了其相關基因並能在轉基因淡水植物中產生耐鹽表型;另一方面，在擬南芥突變體及利用酵母鹽敏感突變株功能互補篩選得到一些編碼信號傳遞蛋白的基因，這些都有助於闡明植物鹽脅迫應答的分子機制。When scientists scan the global horizon, over - fishing, loss of species habitat, water shortage, climate change, and invasive1 species look to be the biggest threats to the earth
研究者們環視全球，發現過度捕撈、物種棲息地缺失、水資源缺乏、氣候變化和外來物種入侵是對地球最大的威脅。Firstly we maked sure method of isolating arabidopsisis mutant by thermal imagings in many ways on trial, optimize conditions for isolation, and confirm the good period of seedlings and fine density for isolation, select correct isolating pressure ( drought and h2o2 ) that is fit for isolate mutant. secondly we obtain an ml population derived from 0. 4 % ethyl methanesulfonate ( ems ) - mutagenized wild type arabidopsis thaliana
本實驗首先是對利用遠紅外成像技術篩選擬南芥突變體方法的可行性進行多方面的試驗，優化篩選條件、確定篩選所需幼苗的生長時間、種植密度，界定用於篩選所需的脅迫（過氧化氫和乾旱）選擇壓力。In this dissertation, effects of different acidities of simulated acid rain and different concentrations of zn or cd on the fresh weights, contents of chlorophyll, activities of sod, pod, cat, and contents of mda in brassica chinensis l and phaseolus vulgaris l were studied with a pot experiment. the main results were as follows : the contents of chlorophyll of brassica chinensis l and phaseolus vulgaris l had the same tendency as the biomass of these two plants treated with simulated acid rain, zn and cd. the fresh weights and contents of chlorophyll of brassica chinensis l decreased with increasing in concentrations of zn, cd and acidity of simulated acid rain
本文通過盆栽試驗，研究了不同強度的模擬酸雨和不同濃度的zn 、 cd對小白菜、四季豆生長量、葉綠素含量、根和葉保護酶活性以及mda含量的影響，主要研究結果如下：在模擬酸雨和zn 、 cd的脅迫下，小白菜、四季豆葉綠素含量與其生長量有著相同的變化趨勢，其中小白菜鮮重和葉綠素含量隨著zn 、 cd濃度以及酸雨強度的增加而減小，四季豆鮮重和葉綠素含量隨著zn 、 cd濃度以及酸雨強度的增加先升高後下降。The results indicated that, peoples coping behaviour and mental health were affected by the type of sars - related information they received. some information led to over - worrying behaviour, irrational nervousness or scare. on the other hand, positive information, including recovery information and government measures could depress irrational cognition and thus helped the public evaluate correctly the risk of sars, reinstating rationality in the community
其中，調查結果發現民眾心理恐慌的情度受不同信息的影響，有些會使市民過度擔心及變成非理性，而一些信息如政府的防範措施和治愈人數則能幫助市民正確評價非典型肺炎的威脅性，使民眾保持理性行為。分享友人