selective pressure 中文意思是什麼
selective pressure
解釋
選擇壓力-
On the medium containing 3 mg / l of ppt as selective agent, about 65 % of t1 seeds germinated, while only 5 % for wild - type seeds. on selection pressure - free medium, about 73 % of tl seedlings were gus - positive and none for the control seedlings. this is coincided with the mendel ' s law of 3 : 1 segregation
T _ 1代的種子在含ppt3 . 0mg l的萌發培養基上萌發率為65 ，在沒有篩選壓的培養基上生長的苗子的gus陽性率為72 . 82 ，符合孟德爾的3 ： 1的分離定律（去除本身不萌發的因素） 。 -
The petroleum chemical industry with the activated charcoal evengrain - size distribution, the high benzene adsorption dynamics, wear - resisting, resists corrosion, the selective adsorption performance isoutstanding, mainly uses in the petroleum, the natural gas and thecarbonificated industry vapor phase live pressure adsorption, theliquid phase separation, the solvent recovery, the liquid and the gasproduct purifies, and is mad in the fluid product organic sulfideremoveing
均勻的粒度分佈，高的苯吸附力，耐磨、耐蝕，選擇吸附性能優異，主要用於石油、天然氣及煤化工業的汽相變壓吸附，液相分離，溶劑回收，液體及氣體產品凈化，及氣液產品中的有機硫化物的去除。 -
The shearing layer is carried by the jet and the eddy is formed because of the instability and selective amplification of shearing layer which will propagate to the downstream. as the eddy impacts the impinging wall, a wave of pressure disturbance with certain frequency is induced. this wave then propagates to the upstream with high speed, and results in the overlap and amplification of the waves when the frequencies of them are close with each other
當前噴嘴流束中的不穩定擾動波在穿過腔內的剪切層時，剪切層對其有選擇放大作用，形成渦環結構，剪切流動中渦環與碰撞壁撞擊，在碰撞區域產生壓力擾動波並向上游反射，在上游剪切層分離處誘發新的擾動的產生，當新擾動與原擾動匹配時，射流上游就被不斷地受到周期性激勵，腔內就產生流體自激振蕩並在後噴嘴出口形成脈沖射流。 -
Fabrication and inspection method for high pressure urea equipment selective corrosion and metallographic examination on the urea grade extra low carbon cr - ni - mo austenitic stainless steel
尿素高壓設備製造檢驗方法.尿素級超低碳鉻鎳鉬奧氏體不銹鋼的選擇性腐蝕檢查和金相檢查 -
Selective absorption of electromagnetic wave. adw employing gases which do n ' t absorb the laser energy can form a gas urtain " whose pressure of the two sides is equal to the low pressure of laser cavity and the ambient circumstance pressure respectively so it can isolate the higher pressure ambient air from entrancing into the laser cavity and maintain the hel ' s running normally
氣動窗口利用對激光器輸出波長沒有任何吸收作用的特殊氣體作為窗口工作介質，並根據氣體動力學部分相關原理，能生成一個具有與激光腔低壓和環境大氣高壓相匹配的壓力梯度、並把激光器低壓工作介質和外界大氣相隔離的「氣幕」 ，從而保證高能激光器的正常工作。 -
The new data suggest that the glutamate receptors and other similar neuro - transmitter receptors may actually evolve from ancestral methods of simple communication, common to plants and animals alike. selective environmental pressure may have led to a higher production of these neurotoxins for defense against predators more recently in evolutionary time. neurotoxins isolated from plants may be originally signalling molecules regulating these plant receptors
林教授指出以往生物學家相信植物製造神經毒素純是為了防禦草食類動物的侵襲，但這項植物?氨酸感受器的研究卻指向另一可能性，即神經毒素最初可能是植物用來作訊息傳遞的分子，通過?氨酸感受器和其他類似的感受器來調控植物本身的生命功能。 -
The abuses of antibiotics in medicine and livestock exposed to environmental bacteria lead to a large - scale dissemination of antibiotic - resistance bacteria in aquatic environment under selective pressure and the resistant organism could transfer resistance genes across the genus and species by plasmid and integron, antibiotic resistance microbes are common in aquatic environment and the aquatic environment has become a major reservoir for antibiotic - resistant microbes
摘要臨床和畜禽業抗生素的濫用導致微生物在選擇性壓力作用下獲得並維持耐藥性，並有可能通過質粒和整合子將耐藥基因在相同或不同種屬中廣泛傳播轉移，最終導致多重耐藥。 -
Using the microwave selective heating property for materials, by setup equivalent equation, and first time inducing the electromagnetic field perturbation theory to the design of heating materials for substrate in mpcvd, three temperature distribution modes were established, including temperature distribution comprehensive mode of inhomogeneous plasma, temperature distribution composite mode of composite substrate materials, temperature distribution perturbation mode of composite materials, which ii provided an whole new technology route to the design of substrate heating system in mpcvd and guided the preparation of heating materials for substrate. and then the heating materials for substrate were designed and optimized to obtain large area homogeneous temperature distribution even larger than substrate holder ' s diameter. as an important part, this thesis researched the nucleation and growth of diamond films in mpcvd, systematically researched the effects of substrate pretreatment, methane concentration, deposition pressure and substrate temperature etc experimental technologic parameters on diamond films " quality on ( 100 ) single crystal silicon substrate in the process of mpcvd, characterized the films qualities in laser raman spectra ( raman ), x - ray diffraction ( xrd ), scanning electron microscopy ( sem ), infrared transmission spectra ( ir ), atomic force microscopy ( afm ), determined the optimum parameters for mpcvd high quality diamond in the mpcvd - 4 mode system
該系統可通過沉積參數的精確控制，以控制沉積過程，減少金剛石膜生長過程中的缺陷，並採用光纖光譜儀檢測分析等離子體的可見光光譜以監測微波等離體化學氣相沉積過程；利用微波對材料的選擇加熱特性，通過構造等效方程，並首次將電磁場攝動理論引入到mpcvd的基片加熱材料的設計中，建立了非均勻等離子體溫度場綜合模型、復合介質基片材料的復合溫度場模型及復合介質材料溫度場攝動模型，為mpcvd的基片加熱系統設計提供了一條全新的技術路線以指導基片加熱材料的制備，並對基片加熱材料進行了設計和優選，以獲取大面積均勻的溫度場區，甚至獲得大於基片臺尺寸的均勻溫度區；作為研究重點之一，開展了微波等離體化學氣相沉積金剛石的成核與生長研究，系統地研究了在（ 100 ）單晶硅基片上mpcvd沉積金剛石膜的實驗過程中，基片預處理、甲烷濃度、沉積氣壓、基體溫度等不同實驗工藝參數對金剛石薄膜質量的影響，分別用raman光譜、 x射線衍射（ xrd ） 、掃描電鏡（ sem ） 、紅外透射光譜（ ir ） 、原子力顯微鏡（ afm ）對薄膜進行了表徵，確立了該系統上mpcvd金剛石膜的最佳的實驗工藝參數。 -
The most variable regions between hi and b strain reside in vp2 and vp3 overlap region ( 319 - 470 ), which are supposedly exposed to the surface of the capsid. it is possible due to the selective pressure from host immune system. the largest divergence between the gpv - h1 and mdpv capsid polypeptides located between the start cordons of vp2 and vp3
H1株與gpv - b株氨基酸的差異集中在vp2 、 vp3重疊區的319 - 470位之間，這與預期暴露于病毒最表面的區域相吻合，可能是宿主免疫篩選導致的變異； gpv - h1株和mdpv之間還存在另一高變區，位於vp2和vp3起始密碼子之間，這可能與兩病毒有不同宿主域相關。 -
First, a plant expression vector, pbbbt was constructed by inserting tsase into pbbb - etr to substitute the etr gene within the plant expression vector. then, it was introduced into the super - poison agrobacterium tumerfaciens eha105 through the " triparental mating " method. twenty regenerated tobacco plantlets were obtained with selection medium under the ppt selective pressure
首先將tsase基因取代植物表達載體pbbb - etr的etr基因構建植物表達載體pbbbt ，然後利用「三親交配」法導入超毒性農桿菌菌株eha105中，接著通過農桿菌介導法遺傳轉化煙草，經過連續的ppt抗性篩選，獲得20株抗性植株。
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