ELIZA

return kwic search for activity out of >500 occurrences
475194 occurrences (No.33 in the rank) during 5 years in the PubMed. [no cache] 500 found

268) The relationship of H2 production with H(+) transport across the membrane and membrane-associated ATPase activity is shown.

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PMID:23895041 DOI:10.3109/07388551.2013.809047

2015 Critical reviews in biotechnology

* Mechanisms for hydrogen production by different bacteria during mixed-acid and photo-fermentation and perspectives of hydrogen production biotechnology.

- H2 has a great potential as an ecologically-clean, renewable and capable fuel. It can be mainly produced via hydrogenases (Hyd) by different bacteria, especially Escherichia coli and Rhodobacter sphaeroides. The operation direction and activity of multiple Hyd enzymes in E. coli during mixed-acid fermentation might determine H2 production; some metabolic cross-talk between Hyd enzymes is proposed. Manipulating the activity of different Hyd enzymes is an effective way to enhance H2 production by E. coli in biotechnology. Moreover, a novel approach would be the use of glycerol as feedstock in fermentation processes leading to H2 production. Mixed carbon (sugar and glycerol) utilization studies enlarge the kind of organic wastes used in biotechnology. During photo-fermentation under limited nitrogen conditions, H2 production by Rh. sphaeroides is observed when carbon and nitrogen sources are supplemented. The relationship of H2 production with H(+) transport across the membrane and membrane-associated ATPase activity is shown. On the other hand, combination of carbon sources (succinate, malate) with different nitrogen sources (yeast extract, glutamate, glycine) as well as different metal (Fe, Ni, Mg) ions might regulate H2 production. All these can enhance H2 production yield by Rh. sphaeroides in biotechnology Finally, two of these bacteria might be combined to develop and consequently to optimize two stages of H2 production biotechnology with high efficiency transformation of different organic sources.

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(1)70 of	(13)6 patterns	(25)3 but	(37)2 functional
(2)54 null	(14)5 may	(26)3 changes	(38)2 increased
(3)49 and	(15)5 using	(27)3 for	(39)2 induces
(4)45 in	(16)5 with	(28)3 measured	(40)2 level
(5)17 was	(17)4 at	(29)3 through	(41)2 or
(6)11 against	(18)4 levels	(30)2 Questionnaire	(42)2 over
(7)10 during	(19)4 on	(31)2 after	(43)2 promotion
(8)9 (PA)	(20)4 which	(32)2 between	(44)2 resumption
(9)8 is	(21)4 while	(33)2 calcium	(45)2 than
(10)7 to	(22)3 among	(34)2 compared	(46)2 that
(11)7 were	(23)3 are	(35)2 decreased	(47)2 via
(12)6 by	(24)3 as	(36)2 diary	(48)2 when

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--- WordNet output for activity --- =>活動, 活躍, 働き, 動き, 活気 Overview of noun activity The noun activity has 6 senses (first 3 from tagged texts) 1. (43) activity -- (any specific behavior; "they avoided all recreational activity") 2. (36) action, activity, activeness -- (the state of being active; "his sphere of activity"; "he is out of action") 3. (13) bodily process, body process, bodily function, activity -- (an organic process that takes place in the body; "respiratory activity") 4. activity -- ((chemistry) the capacity of a substance to take part in a chemical reaction; "catalytic activity") 5. natural process, natural action, action, activity -- (a process existing in or produced by nature (rather than by the intent of human beings); "the action of natural forces"; "volcanic activity") 6. activeness, activity -- (the trait of being active; moving or acting rapidly and energetically; "the level of activity declines with age") --- WordNet end ---