Nitrogen dynamics and removal in a horizontal flow biofilm r

英语翻译
SALUDOS EL GENERADOR DE NITROGENO 8890 PARA CAMION SI LO PUEDEN ENVIAR COMO CARGA SUELTA A ECUADOR
PARA HACER EL DEPASITO A SU CUENTA Y SI SE PADRIA ENVIAR SOLO 1 USTED TIENE CONOCIMIENTO DE ALGUNA COMPANIA QUE
TRAIGA MERCANCIA ASI POR UNIDAD POR FAVOR CONFIRME SI ES POSIBLE Y POR QUE EMPRESA VENDRIA

Nitrogen regulation in an Escherichia coli strain
with a temperature sensitive glutamyl-tRNA synthetase

a portion of the nitrogen source is lost by offgassing 中的offgass是什么意思?
a portion of the nitrogen source is lost by offgassing 中的offgass是什么意思.【Biochemical Engineering Journal杂志中Repeated fed-batch cultivation of Arthrospira (Spirulina) platensis using urea as nitrogen source一文】

英语翻译
Scheme 1 141
Introduction
The synthesis of nitrogen-containing heterocycles such as
indoles has been one of the most active areas in organic
chemistry due to their extensive existence in a great number
of biologically active compounds.1 Among the numerous
methods for the preparation of these azaheterocycles,2
the intramolecular hydroamination reaction represents a
highly atom-economic way and many kinds of catalysts
have been developed for this transformation.3 Recently,as
a continuation of their pioneering work in zinc-mediated
cyclization of 2-ynylphenol or -aniline,Nakamura and coworkers
have developed a novel tandem cyclization/
nucleophilic addition procedure of N-benzyl-protected
alkynylanilines with electrophiles to form indole derivatives
mediated by one equivalent of n-BuLi,ZnCl2,
[Pd2(dba)3] (cat.) or n-BuLi,ZnCl2,CuCN·2LiCl.4
Our group has demonstrated that the use of alkynyl sulfonamides
bearing a more acidic NH permits the use of diethylzinc
instead of the more basic n-butyllithium.5 The
use of this weaker base allows for the generation of a sufficiently
nucleophilic nitrogen anion for cyclization,
while conceding for a broader functional group tolerance.
Moreover,a catalytic amount of diethylzinc was found to
be able to catalyze the cyclization reaction and when an
excess of diethylzinc was used,the resulting indole zinc
salt intermediate could undergo reactions with acid chloride
or halides to form C2,C3-disubstituted indoles.Notably,
the choice of sulfonyl groups as the protecting group
was crucial to effect such a cyclization process and the use
of unprotected primary amine or acyl-protected substrates
all failed in this transformation.5
Scope and Limitations
Firstly,a series of 4-substituted 2-ethynyl-N-tosylanilines
were prepared and studied in the cyclization reaction with
20 mol% of diethylzinc in toluene (Scheme 1,Table 1).In
general,both the substrates with electron-withdrawing or
electron-donating groups could provide the desired indole
derivative products in excellent yields,while a shorter reaction
time was observed for the electron-withdrawing
ones (Table 1,entries 3–7).It was found that both halogen
and nitro group were well tolerated in the reaction.In addition,
compounds with alkyl and functionalized alkyl
substituents on the acetylene terminal (R1) were also tested
under similar reaction conditions and the corresponding
indole products could also be obtained in high yields
(Table 1,entries 8–11).Unfortunately,when the substituent
was TMS,the cyclization was inhibited completely,
affording only the deprotected aniline 1i after 24 hours
(1l/1i = 6:1) (Table 1,entry 12).6

求一篇英文文献,
求这篇英文文献
Photosynthetic Acclimation and Nitrogen Partitioning Within a Lucerne Canopy.II.Stability Through time and comparison with a theoretical optimum.Functional Plant Biology,1993,20(1):69-82.

英语翻译
how much do you need to increase the nitrogen concentration to affect a nine-fold increase in reaction rate.
特别是nine-fold是什么意思,怎么查也查不到,急,
为什么nine-fold就是9倍的意思呢，fold没有倍数的意思啊，

英语翻译
State the two main ways by which nitrogen is fixed in nature

英语翻译
1 Air( )of a combination of nitrogen and oxygen
A composes B comprises C forms D consists
2 The words of his old teacher left a( )impression on his mind.He is still influenced by them
A long B lively C lasting D liberal

求解一道逻辑题
Nitrogen dioxide is a pollutant emitted by automobiles.Catalytic converters,devices designed to reduce nitrogen dioxide emissions,have been required in all new cars in Donia since 1993,and as a result,nitrogen dioxide emissions have been significantly reduced throughout most of the country.Yet although the proportion of new cars in Donia’s capital city has always been comparatively high,nitrogen dioxide emissions there have showed only an insignificant decline since 1993.
Which of the following,if true,most helps to explain the insignificant decline in nitrogen dioxide emissions in Donia’s capital city?
A.More of the cars in Donia’s capital city were made before 1993 than after 1993.
B.The number of new cars sold per year in Donia has declined slightly since 1993.
C.Pollutants other than nitrogen dioxide that are emitted by automobiles have also been significantly reduced in Donia since 1993
D.Many Donians who own cars made before 1993 have had catalytic converters installed in their cars.
E.Most car trips in Donia’s capital city are too short for the catalytic converter to reach its effective working temperature.
我觉得这里没有答案,但官方给的答案是E,我认为E说的是catalytic converter是否能够有效的工作,原文没说他的工作有效性啊,

The air is made up of more than 70% of nitrogen（同义句）
The air ___ ___ ___ more than 70% of nitogen
The air ___ ___ ___ more than 70% of nitogen(要两种不同的填法)

英语翻译
If there were no nitrogen to thin down the oxygen in the air we breathe,.

Many gases,including the nitrogen and oxygen in air,_____ color or odor. 　　
(A)have no
　　(B)which have no
　　(C)not having
　　(D)they do not have

2道英语化学题
1.How many single covalent bonds must a nitrogen atom in a neutral molecule form in order to have a complete octet in its valence shell?A)4 B)3 C)2 D)1
2.什么是monoprotic fluoroacetic?

knowing what you know about the the nitrogen cycle ,what could you do other

英语翻译
The amounts of protein,
nitrogen,ash,some minerals,total sugars,total
lipids and amino acids of the RHP were determined.

Where to buy muscle technology is nitrogen protein powder,BSN,Optimum whey protein powder

A mixture of gases contains78.08% nitrogen 20.95% Oxygen and 0.97% other gases (Argon,Carbon Dioxide and Neon).If the total pressure is 101.3 kPa,find the partial pressure of each of the 'three' gases.混合气体中包含氮气,氧气和其他气体（氩,二氧化碳,氖）如果总压强是101.3kPa,分别求出氩、二氧化碳和氖的分压强.

what was the original volume of nitrogen if its initial pressure is 5.2atm before changing to a new pressure of 1.4atm 720C and now occupying 120 liters

They were in time to produce carbon,nitrogen,water vapor and other gases,which were to make the earth's atmosphere中,which 引导的是什么,在句子中,which 代指什么

83：other plants take nitrogen out of the soil.out of the soil 在句中作什么成份呢?