The ultrastructural changes during the development of sieve element companion cell complex (SE/CC complex) in Populus deltoides were investigated using electronic microscopy. The result showed that SE and CC tome from the same secondary phloem mother cell. The development of sieve element went through three stages, i. e. immature, mature, and degenerate stage. In immature stages the sieve element presented radial expansion, cell wall thickening, and production of sieve plastid and P-protein. The cytoplasma selectivly autolysed in mature stage. At the same time, karyoplasm was dispersed, and nuclear envelope was not clear, or karyoplasm was disorgnized, and nuclear envelope was clear. The karyopalsm finally turned into P-protein. In degenerate stage, the cytoplasm completely disappeared, and the function was lost.

利用電鏡技術(shù)研究美洲黑楊次生韌皮部篩管和伴胞發(fā)育過(guò)程中細(xì)胞超微結(jié)構(gòu)的動(dòng)態(tài)變化，觀(guān)察到篩管和伴胞由同一個(gè)次生韌皮部衍生細(xì)胞分裂分化形成篩管約發(fā)育歷經(jīng)未成熟期、成熟期和衰退期的變化未成熟期篩管分子表現(xiàn)為細(xì)胞的徑向擴(kuò)展www.mjjscg.com、壁的增厚、篩管質(zhì)體和P-蛋白質(zhì)的產(chǎn)生欧美性爱性爱大片；成熟期篩管分子細(xì)胞組分發(fā)生選擇性自溶日日干夜夜操av，細(xì)胞核核質(zhì)彌散狀，核膜不清晰久久综合迷奸，或核膜清晰而核物質(zhì)降解黄色精品网，最后細(xì)胞核完全解體轉(zhuǎn)化為P-蛋白質(zhì)類(lèi)的物質(zhì)；衰退期篩管分子細(xì)胞質(zhì)完全解體消失自拍日韩在线视频播放免费网站，失去功能黄片久久久。

Based on the brand life cycle theory and the complexity of the market,this article proposes that a medicine brand life cycle consists of five phases,i.e.,the precursor,appearance,cognizance,famousness and decline.It also analyses the feature of each phase and the relevant marketing strategy f...

文章從品牌生命周期理論出發(fā)城诗诗的一级黄色网站，結(jié)合藥品市場(chǎng)的復(fù)雜性，提出了藥品品牌生命周期国产91网站在线，將其分為前導(dǎo)期秋霞电影网理论电影在线观看、產(chǎn)生期、知曉期人人干人人操女的、知名期性爱在线视频网、衰退期五個(gè)階段，分析了各個(gè)階段特點(diǎn)午夜在线公开视频，并針對(duì)每個(gè)階段提出了相應(yīng)的藥品營(yíng)銷(xiāo)策略国产视免费性爱视频。

The US, he added gloomily,"will have its version of Japan's lost decade".

他沮喪地補(bǔ)充道，美國(guó)"將會(huì)迎來(lái)日本十年衰退期的美國(guó)版欧美在线看你懂的免费看。"

The calculation was on the basis of Excel and Statistica software. The results show that in East China Sea region the 10 main fisheries development have 4 periods: undeveloped, on developing, mature and senescent. It also shows that most of the 10 fisheries are in the periods of senescent, such as hairtail, large yellow croaker, filef...

結(jié)果表明：東海區(qū)主要種類(lèi)漁業(yè)發(fā)展過(guò)程符合漁業(yè)發(fā)展的一般規(guī)律色图综合亚洲，即經(jīng)歷未開(kāi)發(fā)、開(kāi)發(fā)中免费观看人成、成熟和衰退 4個(gè)階段曰韩性交业余，且主要種類(lèi)如帶魚(yú)、大黃魚(yú)五月婷婷c、小黃魚(yú)欧洲亚洲自拍、馬面等漁業(yè)大多處于成熟期或衰退期，從而預(yù)測(cè)其發(fā)展趨勢(shì)美女频黄，并提出必須加強(qiáng)漁業(yè)管理国产午夜福利在线观看禁、控制捕撈強(qiáng)度等使?jié)O業(yè)實(shí)現(xiàn)可持續(xù)發(fā)展的管理措施。

All the same, the nonpartisan National Bureau of Economic Research will almost certainly conclude in 2009 that a recession has occurred.

盡管如此欧美又粗又大又长A片，無(wú)黨派的國(guó)家經(jīng)濟(jì)研究局幾乎肯定會(huì)在2009年宣布衰退期的到來(lái)AV剧情麻豆国产在线观看。

Business and consumer confidence data have weakened to near recessionary levels.

商業(yè)和消費(fèi)者信心數(shù)據(jù)走低，接近經(jīng)濟(jì)衰退期的水平成年人欧美片。

Results showed that the alga increased the boimass in growing period and withered quickly in recession period with the increase in terramycin concentrations within 0-5 mg/L; and terramycin improved the contents of pigments more or less.

結(jié)果表明：在0—5mg／h范圍內(nèi)干鲁鲁鲁鲁鲁鲁，土霉素的濃度越大，細(xì)胞數(shù)量在增長(zhǎng)期內(nèi)增幅越大国产又粗又大又长免费视频。在衰退期內(nèi)衰退越快日韩中文自拍无码AV；土霉素對(duì)色素含量有不同程度的促進(jìn)作用。氯霉素濃度〉1mg/L時(shí)那有毛片网站。

With much of the world in recession, the banking industry has been girding itself for some time against the threat in recessions banks expect to make losses on loans.

隨著世界大部分地區(qū)進(jìn)入衰退期欧美黄色视频,黑人黄色视频，為應(yīng)對(duì)危機(jī)，銀行業(yè)惜貸已經(jīng)有一段時(shí)間了--在衰退期国产精品久久无码AV片，銀行的貸款業(yè)務(wù)會(huì)遭到損失日本第一页。

Effects of reaction time on SBET , pore volume, average pore diameter and coke over Co - ZSM - 5 zeolite under aldehyde - ammonia condensation were discussed.

本文在研究反應(yīng)時(shí)間對(duì)醛氨縮合催化劑Co-ZSM-5分子篩比表面積、孔體積、平均孔徑及積炭量的影響中發(fā)現(xiàn)91久久高清国产自产拍，Co-ZSM-5分子篩催化劑的失活過(guò)程經(jīng)歷四個(gè)階段：高水平活性穩(wěn)定期www色五月、活性衰退期、低水平活性穩(wěn)定期和二次活性衰退期四個(gè)階段www.hh6554.com。

There remained the generic conditions imposed by natural, as distinct from human law, as integral parts of the human whole: the necessity of destruction to procure alimentary sustenance: the painful character of the ultimate functions of separate existence, the agonies of birth and death: the monotonous menstruation of simian and human females extending from the age of puberty to the menopause: inevitable accidents at sea, in mines and factories: certain very painful maladies and their resultant surgical operations, innate lunacy and congenital criminality, decimating epidemics: catastrophic cataclysms which make terror the basis of human mentality: seismic upheavals the epicentres of which are located in densely populated regions: the fact of vital growth, through convulsions of metamorphosis, from infancy through maturity to decay.

324截然不同于人為的法則美女被插高潮到爽，這里依然存在著按照自然的法則作為對(duì)維持整個(gè)人類(lèi)的生存不可分割的部分加諸于人的生物學(xué)之基本條件。為了獲得有營(yíng)養(yǎng)的食品国产操穴视频，就不得不進(jìn)行破壞性的殺戮国产成年无码久久久久电影。孤立的個(gè)人生存中終極機(jī)能那充滿(mǎn)了苦惱的性質(zhì)。生與死的痛苦九九视频这里有精品视频。類(lèi)人猿和人類(lèi)女性那單調(diào)的月經(jīng)国产在线91播放精品，自初潮期一直延續(xù)到閉經(jīng)期。海洋上夜夜燥天天燥视频、礦山和工廠(chǎng)里那些不可避免的事故欧美性爱A片一级；某些非常痛苦的疾病以及伴隨而來(lái)的外科手術(shù)；生來(lái)的瘋顛欧美A片激情日，先天性犯罪癖999在线视频免费观；導(dǎo)致人口大批死亡的傳染病免费无删减大尺度漫画；在人類(lèi)心靈深處種下恐怖種子的災(zāi)難性特大洪水干操a毛片；震中位于人口密集地區(qū)的大地震；歷經(jīng)劇烈變形狼友综合，自幼年經(jīng)過(guò)成熟期進(jìn)入衰退期的生命成長(zhǎng)的事實(shí)国产AV永久无码精品网站。

Decline phase：衰亡期

4.衰亡期(decline phase) 穩(wěn)定期后細(xì)菌繁殖越來(lái)越慢,死亡數(shù)越來(lái)越多,并超過(guò)活菌數(shù). 該期細(xì)菌形態(tài)顯著改變,出現(xiàn)衰退型或菌體自溶,難以辨認(rèn);生理代謝活動(dòng)也趨于停滯. 因此,陳舊培養(yǎng)的細(xì)菌難以鑒定.

decline stage：衰退期

S曲線(xiàn)(S-Curve)就是產(chǎn)品生命周期曲線(xiàn),見(jiàn)文[BCG矩陣的時(shí)間因子與產(chǎn)品生命周期曲線(xiàn)]討論,S曲線(xiàn)橫軸為時(shí)間,縱軸為產(chǎn)品普及率或銷(xiāo)售量. 根據(jù)S曲線(xiàn)劃分,一產(chǎn)品生命周期包括起步期(Introduction Stage)日操av在线播放、成長(zhǎng)期(Growth Stage)、成熟期(Maturity Stage)與衰退期(Decline Stage)等.

Declining distinctiveness：衰退的特色

"產(chǎn)品生命周期的衰退期","Decline stage of PLC" | "衰退的特色","Declining distinctiveness" | "市場(chǎng)控制程度","Degree of market control"

epidermis：表皮層

皮膚是由兩層基本的結(jié)構(gòu)組成:表皮層(epidermis)是由不同生長(zhǎng)和衰退期的角質(zhì)細(xì)胞(keratinocytes)所組成,真皮層(dermis)主要細(xì)胞的組成是纖維母細(xì)胞(fibroblasts),它是皮膚結(jié)締組織合成纖維的元素,例如膠原蛋白(collagen)和彈力蛋白纖維(elastin fiber),

life cycle：生命周期

10.不同生命周期的商品: 任何商品皆有其"生命周期"(LIFE CYCLE),只是時(shí)間長(zhǎng)短而已,長(zhǎng)則數(shù)十年,短則數(shù)個(gè)月. 商品的生命周期包括:"引進(jìn)期"人人摸人人摸操、"成長(zhǎng)期"色交网站、"成熟期"、"飽和期"及"衰退期"五個(gè)階段. 在不同的階段,

life cycle：壽命周期

鋁制罐已支配世界罐頭市場(chǎng)長(zhǎng)達(dá)35 年以上的時(shí)間,目前從商品貨架壽命周期(Life Cycle)來(lái)看它已經(jīng)有進(jìn)入市場(chǎng)衰退期的跡象. 以前,大部分積累了許多開(kāi)發(fā)經(jīng)驗(yàn)和研究經(jīng)費(fèi)的企業(yè)大多數(shù)投入了DWI 飲料罐的生產(chǎn). 但是,

Product life cycle：產(chǎn)品的生命周期

但采購(gòu)量又與產(chǎn)品的生命周期(Product Life Cycle)所處的階段有直接的關(guān)系,產(chǎn)品由導(dǎo)入期无码一区二区久久免费、成長(zhǎng)期到成熟期,采購(gòu)量會(huì)逐漸放大,直到衰退期出現(xiàn),采購(gòu)量才會(huì)逐漸縮小.

life span：生命期

懸浮型細(xì)胞一般沒(méi)有潛伏期,接種并添加新鮮培養(yǎng)液后即可迅速進(jìn)入指數(shù)增長(zhǎng)2.培養(yǎng)細(xì)胞的生命期(life span) 培養(yǎng)細(xì)胞的生命期指的是細(xì)胞在培養(yǎng)中持續(xù)增殖和生長(zhǎng)的時(shí)間,一般可分為原代培養(yǎng)期www.久久cao、傳代期和衰退期.

recessionary：衰退的; 衰退期的 (形)

recessional 退場(chǎng)贊美詩(shī) (名) | recessionary 衰退的; 衰退期的 (形) | recessive 后退的; 逆行的; 退隱的; 隱性的 (形)

step out of recession：走出衰退期

7: issues of mutual concern:雙方共同關(guān)注的問(wèn)題 | 8: step out of recession:走出衰退期 | 9: solid evidence:可靠證據(jù)