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  • Frankenberger, W. T.  (9)
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  • 1
    Online Resource
    Online Resource
    Springer Science and Business Media LLC ; 1991
    In:  Biology and Fertility of Soils Vol. 11, No. 1 ( 1991-4), p. 1-5
    In: Biology and Fertility of Soils, Springer Science and Business Media LLC, Vol. 11, No. 1 ( 1991-4), p. 1-5
    Type of Medium: Online Resource
    ISSN: 0178-2762 , 1432-0789
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 1991
    detail.hit.zdb_id: 1473419-9
    detail.hit.zdb_id: 742137-0
    SSG: 12
    Location Call Number Limitation Availability
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  • 2
    Online Resource
    Online Resource
    Wiley ; 1981
    In:  Soil Science Society of America Journal Vol. 45, No. 2 ( 1981-03), p. 333-338
    In: Soil Science Society of America Journal, Wiley, Vol. 45, No. 2 ( 1981-03), p. 333-338
    Type of Medium: Online Resource
    ISSN: 0361-5995
    RVK:
    Language: English
    Publisher: Wiley
    Publication Date: 1981
    detail.hit.zdb_id: 241415-6
    detail.hit.zdb_id: 2239747-4
    detail.hit.zdb_id: 196788-5
    detail.hit.zdb_id: 1481691-X
    SSG: 13
    SSG: 21
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  • 3
    Online Resource
    Online Resource
    Wiley ; 1980
    In:  Soil Science Society of America Journal Vol. 44, No. 2 ( 1980-03)
    In: Soil Science Society of America Journal, Wiley, Vol. 44, No. 2 ( 1980-03)
    Type of Medium: Online Resource
    ISSN: 0361-5995 , 1435-0661
    RVK:
    Language: English
    Publisher: Wiley
    Publication Date: 1980
    detail.hit.zdb_id: 241415-6
    detail.hit.zdb_id: 2239747-4
    detail.hit.zdb_id: 196788-5
    detail.hit.zdb_id: 1481691-X
    SSG: 13
    SSG: 21
    Location Call Number Limitation Availability
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  • 4
    Online Resource
    Online Resource
    Wiley ; 1982
    In:  Soil Science Society of America Journal Vol. 46, No. 2 ( 1982-03), p. 280-284
    In: Soil Science Society of America Journal, Wiley, Vol. 46, No. 2 ( 1982-03), p. 280-284
    Abstract: Amides added to soils are hydrolyzed to ammonium (NH + 4 ) and their corresponding carboxylic acids. Studies of transformations of amide‐N in soils deserve attention because amides have potential as nitrogen (N) fertilizers. In this work, the transformations of amide‐N (200 µg/g of soil) were studied in field‐moist soils incubated under aerobic conditions at 30°C for 14 days. The recovery of inorganic N (as NH 3 , NH 4 + , NO 2 ‐ , and NO 3 ‐ ) produced from 25 amides or their derivatives was determined and compared with those obtained with (NH 4 ) 2 SO 4 and urea added to five soils. Results showed that with the exception of cyanamide, dicyandiamide, benzenesulfonamide, and sulfanilamide, which resisted decomposition, all other amides were readily hydrolyzed in the five soils used. With most of the amides studied, the inorganic N produced was accumulated as NO 3 ‐ . The recovery of nitrogen as NO 3 ‐ from each of five soils treated with urea, acetamide, propionamide, 2‐cyanoacetamide, n ‐butyramide, oxamide, or DL ‐lactamide was 〈 50% of the N added. The average percentage of NH 4 + ‐N recovered from the soils used exceeded 40% of the total inorganic N produced when thioacetamide, fluoroacetamide, and 2‐chloroacetamide were added to soils. With one sandy soil, the addition of urea, formamide, N ‐benzylformamide, and p ‐nitrobenzamide resulted in accumulation of NO 2 ‐ , ranging from 5 to 21% of the inorganic N recovered. Appreciable amounts of NH 3 were volatilized when formamide, acrylamide, 2‐cyanoacetamide, p ‐nitrobenzamide, and urea were applied to soils, especially from the sandy soil. The average recovery of amide‐N as inorganic N from the five soils used ranged from 4% with dicyandiamide to 100% with formamide.
    Type of Medium: Online Resource
    ISSN: 0361-5995 , 1435-0661
    RVK:
    Language: English
    Publisher: Wiley
    Publication Date: 1982
    detail.hit.zdb_id: 241415-6
    detail.hit.zdb_id: 2239747-4
    detail.hit.zdb_id: 196788-5
    detail.hit.zdb_id: 1481691-X
    SSG: 13
    SSG: 21
    Location Call Number Limitation Availability
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  • 5
    Online Resource
    Online Resource
    Wiley ; 1980
    In:  Soil Science Society of America Journal Vol. 44, No. 3 ( 1980-05), p. 532-536
    In: Soil Science Society of America Journal, Wiley, Vol. 44, No. 3 ( 1980-05), p. 532-536
    Abstract: Studies to determine the kinetic parameters of the amidasecatalyzed reaction in soils showed that the K m values of formamide, acetamide, and propionamide for this enzyme are similar to those of the same enzyme isolated from microorganisms. Application of the three linear transformations of the Michaelis‐Menten equation indicated that the apparent K m constants of the three substrates (formamide, acetamide, and propionamide) varied among the soils studied, but the results obtained by the three plots were similar. By using the Lineweaver‐Burk plot, the K m values of formamide, acetamide, and propionamide in eight soils ranged from 6.7 to 17.9m M (avg. 12.3), 4.0 to 5.1m M (avg. 4.6), and 10.1 to 20.2m M (avg. 14.5), respectively. The K m value is the lowest and affinity constant is the highest at optimum pH of amidase activity. With the substrate used in parentheses, the V max values of the eight soils ranged from 138 to 438 µg NH 4 ‐N released/g soil per 24 hours (formamide), from 13 to 43 µg NH 4 ‐N released/g soil per 24 hours (acetamide), and from 35 to 105 µg NH 4 ‐N released/g soil per 24 hours (propionamide). The activation energy values for the amidase activity, expressed in kJ/mol, ranged from 43.3 to 49.8 (avg. 46.9), from 43.2 to 55.5 (avg. 50.0), and from 22.6 to 29.8 (avg. 26.5) using formamide, acetamide, and propionamide as substrates, respectively. The average temperature coefficient ( Q 10 ) of the amidase‐catalyzed reaction in the eight soils studied for temperature ranging from 10 to 60°C was 1.70 for formamide, 1.73 for acetamide, and 1.42 for propionamide.
    Type of Medium: Online Resource
    ISSN: 0361-5995 , 1435-0661
    RVK:
    Language: English
    Publisher: Wiley
    Publication Date: 1980
    detail.hit.zdb_id: 241415-6
    detail.hit.zdb_id: 2239747-4
    detail.hit.zdb_id: 196788-5
    detail.hit.zdb_id: 1481691-X
    SSG: 13
    SSG: 21
    Location Call Number Limitation Availability
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  • 6
    Online Resource
    Online Resource
    Wiley ; 1980
    In:  Soil Science Society of America Journal Vol. 44, No. 2 ( 1980-03), p. 282-287
    In: Soil Science Society of America Journal, Wiley, Vol. 44, No. 2 ( 1980-03), p. 282-287
    Abstract: Amidase [acylamide amidohydrolase, EC (Enzyme Commission) 3.5.1.4] is the enzyme that catalyzes the hydrolysis of amides and produces the corresponding carboxylic acid and ammonia. The detection of this enzyme in soils is reported, and a simple, sensitive, and precise method to assay amidase is described. The method involves determination by steam distillation of the NH 4 + produced by amidase activity when soil is incubated with buffered (0.1 M THAM, pH 8.5) amide solution and toluene at 37°C. The amide compounds studied included formamide, acetamide, and propionamide. The procedure developed gives quantitative recovery of NH 4 ‐N added to soils and does not cause chemical hydrolysis of the substrates. Results showed that this soil enzyme has its optimum activity at buffer pH 8.5 and is inactivated at temperatures above 60°C. By varying the substrate concentration it was found that the initial velocity of the amidase reaction is optimum at 0.05 M substrate. The initial rates of NH 4 ‐N released obeyed zero‐order kinetics. Steam sterilization destroyed, and formaldehyde, sodium fluoride, and sodium arsenite inhibited, amidase activity in soils. Assay of amidase activity in the absence of toluene indicated that acetamide and propionamide may induce the synthesis of this enzyme by soil microorganisms.
    Type of Medium: Online Resource
    ISSN: 0361-5995 , 1435-0661
    RVK:
    Language: English
    Publisher: Wiley
    Publication Date: 1980
    detail.hit.zdb_id: 241415-6
    detail.hit.zdb_id: 2239747-4
    detail.hit.zdb_id: 196788-5
    detail.hit.zdb_id: 1481691-X
    SSG: 13
    SSG: 21
    Location Call Number Limitation Availability
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  • 7
    Online Resource
    Online Resource
    Springer Science and Business Media LLC ; 1982
    In:  Plant and Soil Vol. 64, No. 2 ( 1982-6), p. 153-166
    In: Plant and Soil, Springer Science and Business Media LLC, Vol. 64, No. 2 ( 1982-6), p. 153-166
    Type of Medium: Online Resource
    ISSN: 0032-079X , 1573-5036
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 1982
    detail.hit.zdb_id: 1478535-3
    detail.hit.zdb_id: 208908-7
    SSG: 12
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  • 8
    Online Resource
    Online Resource
    Springer Science and Business Media LLC ; 1991
    In:  Biology and Fertility of Soils Vol. 11, No. 1 ( 1991-4), p. 6-12
    In: Biology and Fertility of Soils, Springer Science and Business Media LLC, Vol. 11, No. 1 ( 1991-4), p. 6-12
    Type of Medium: Online Resource
    ISSN: 0178-2762 , 1432-0789
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 1991
    detail.hit.zdb_id: 1473419-9
    detail.hit.zdb_id: 742137-0
    SSG: 12
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
  • 9
    Online Resource
    Online Resource
    Wiley ; 1981
    In:  Soil Science Society of America Journal Vol. 45, No. 6 ( 1981-11), p. 1120-1124
    In: Soil Science Society of America Journal, Wiley, Vol. 45, No. 6 ( 1981-11), p. 1120-1124
    Abstract: Amidase was recently detected in soils, and this study was carried out to assess the effects of 21 trace elements, 12 herbicides, 2 fungicides, and 2 insecticides on the activity of this enzyme. Results showed that most of the trace elements and pesticides studied inhibited amidase activity in soils. The degree of inhibition varied among the soils used. When the trace elements were compared by using 5 µmol/g of soil, the average inhibition of amidase in three soils showed that Ag(I), Hg(II), As(III), and Se(IV) were the most effective Inhibitors, but only Ag(I) and As(III) showed average inhibition 〉 50%. The least effective inhibitors (average inhibition 〈 3%) included Cu(I), Ba(II), Cu(II), Fe(II), Ni(II), Al(III), Fe(III), Ti(IV), V(IV), As(V), Mo(VI), and W(VI). Other elements that inhibited amidase activity in soils were Cd(II), Co(II), Mn(II), Pb(II), Sn(II), Zn(II), B(III), and Cr(III). Enzyme kinetic studies showed that As(III) was a competitive Inhibitor of amidase, whereas Ag(I), Hg(II), and Se(IV) were noncompetitive inhibitors. When the pesticldes studied were compared by using 10µg of active ingredlent per gram of soil, the average inhibition of amidase in three soils ranged from 2% with dinitroamine, EPTC plus R‐25788, and captan to 10% with butylate. Other pesticides that inhibited amidase activity in soils were atrazine, naptalam, cbloramben, dicamba, cyanazine, 2,4‐D, alachlor, paraquat, trifluralin, maneb, diazinon, and malathion. The inhibition of amidase by diazinon, alachlor, and butylate followed noncompetitive kinetics.
    Type of Medium: Online Resource
    ISSN: 0361-5995 , 1435-0661
    RVK:
    Language: English
    Publisher: Wiley
    Publication Date: 1981
    detail.hit.zdb_id: 241415-6
    detail.hit.zdb_id: 2239747-4
    detail.hit.zdb_id: 196788-5
    detail.hit.zdb_id: 1481691-X
    SSG: 13
    SSG: 21
    Location Call Number Limitation Availability
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