| 4 | Author
| K. Irumakki, N. Shivaram | Requires cookie* | | Title
| Purification and Properties of Potato Phosphorylase Isozymes  | | | Abstract
| Two multiple forms of a-glucan phosphorylase which migrate about half way in polyacryl-amide-gel electrophoresis (named "slow" and "fast" isozyme), were isolated by combined chromato graphy and preparative electrophoresis after freezing the tissue from freshly harvested and from sprouting potato tubers respectively. Depending on the primer used for the synthesis reaction their pH optimum varied between 5.2 and 6.0 and the optimum temperature was 30 and 35 °C. The isoelectric point for the slow isozyme was at pH 5 .0 + 0.1 and for the fast isozyme, pH 5 .5 + 0.1, the molecular weights were 209 000 + 10 000 and 165 000 + 5000 and for their subunits 104 000 + 4000 and 40 000 + 2000 respectively. Both isozymes were inhibited by Hg2+, Ag+ and p-chloromercuro-benzoate (p-CMB). Fe2+ ions inhibited them partially. Mg2+, Mn2+ and sulfhydryl compounds acti vated both. K m values for the slow and fast isozymes with glucose-l-phosphate in presence of soluble starch was 6.7 and 8.0 mM, of amylose 14.3 and 20.0 mM and of glycogen 22.2 and 40.0 mM respectively. The affinity of the primer for the slow and the fast isozymes were as follows: soluble starch 0.5 and 1.0 mM, amylose 2.6 and 3.8 mM, glycogen 6.2 and 7.7 mM respectively. K m values of phos-phorolysis with soluble starch was 0.8 and 0.5 mM, with amylose was 3.1 and 1.1 mM, and with glycogen was 6.5 and 1.3 mM respectively. As substrate and primer the soluble starch was superior and the glycogen was inferior. Amylose was in between. Kinetic parameters suggested the existence of a-glucan phosphorylase isozymes with different specificities: the slow one being more active in the direction of starch synthesis and the fast iso zyme degrading faster the polyglucans. These observations suggest that the polyglucan synthesis and degradation in potato tubers may be regulated by the change in the proportion of slow and fast isozymes. ' | | |
Reference
| (Z. Naturforsch. 31c, 424 [1976]; received April 5 1976) | | |
Published
| 1976 | | |
Keywords
| Potato, Phosphorylase, Isozymes, Purification, Properties | | |
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| default:Reihe_C/31/ZNC-1976-31c-0424.pdf | | | Identifier
| ZNC-1976-31c-0424 | | | Volume
| 31 | |
5 | Author
| Ingrid Gentzen, Hans-G Löffler, Friedh Schneider | Requires cookie* | | Title
| Aminoacylase from Aspergillus oryzae. Comparison with the Pig Kidney Enzyme  | | | Abstract
| Am inoacylase (EC 3.5.1.14) from Aspergillus oryzae was purified from a com m ercially available crude material by heat treatment, precipitation by polyethyleneim ine and amm onium sulfate, gel chromatography and preparative disc-gel-electrophoresis. The purified product was hom ogenous as judged by polyacrylamide gel electrophoresis. SDS-gel electrophoresis, polyacrylam ide-gel-gradient electrophoresis, gel chromatography and amino acid analysis demonstrated the enzyme to be com posed o f two subunits with M r o f 36 600. The kinetic properties o f the enzyme were studied with chloroacetyl derivatives o f alanine, phenylalanine, methionine, leucine, norleucine and tryptophan. The pH optim um o f the acylase activity with chloroacetyl-alanine as substrate is at pH 8.5. Acyl derivatives o f hydrophobic am ino acids are preferred substrates. The enzyme has no dipeptidase activity. Am inoacylase is not inhibited by SH -blocking agents and no SH-groups could be detected with Ellman's reagent in the native and denatured enzyme. The enzyme activity is insensitive to phenylmethylsulfonyl fluoride and N-a-/?-tosyl-L-lysine chlorom ethyl ketone. The microbial acylase is a zinc m etallo enzyme. M etal chelating agents are strong inhibitors; it is further inhibited by Cd2+, Mn2+, N i2+, C u2+ and activated by C o2+. The properties o f pig kidney and Aspergillus acylase are compared. | | |
Reference
| Z. Naturforsch. 35c, 544 (1980); received February 21 1980 | | |
Published
| 1980 | | |
Keywords
| Aspergillus Am inoacylase, Purification, Properties | | |
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| default:Reihe_C/35/ZNC-1980-35c-0544.pdf | | | Identifier
| ZNC-1980-35c-0544 | | | Volume
| 35 | |
6 | Author
| Cornelia Fuchs, G.Erd Hansen | Requires cookie* | | Title
| Partial Purification and Some Properties of Brassica napus Lipase  | | | Abstract
| Lipase (triacylglycerol acylhydrolase EC 3.1.1.3) from rape (Brassica napus cv. Ceres) was isolated from cotyledons of dark-grown seedlings. The enzyme was partially purified by poly ethylene glycol precipitation. Delipidation of the lipase with «-hexane was required prior to further purification by anion exchange chromatography and size exclusion chromatography. A purification factor of 337 was ultimately achieved and the purification process was moni tored by SDS-PAGE. Here, at least two protein bands with molecular masses of 62 and 64 kD a respectively were found in the active fraction obtained by size exclusion chrom atogra phy. Sodium deoxycholate was found to stimulate the lipase activity, but appeared to cause aggregation of the enzyme. It was not possible to estimate the isoelectric point of the dialyzed rape lipase due to the high molecular mass of the aggregates. Two simple methods to detect lipase activity directly on polyacrylamide gel were applied. No esterase activity was found by using p-nitrophenyl acetate as substrate. | | |
Reference
| Z. Naturforsch. 49c, 293—301 (1994); received November 3 1993/March 7 1994 | | |
Published
| 1994 | | |
Keywords
| Lipase, Rape, Purification, Properties | | |
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| default:Reihe_C/49/ZNC-1994-49c-0293.pdf | | | Identifier
| ZNC-1994-49c-0293 | | | Volume
| 49 | |
7 | Author
| | Requires cookie* | | Title
| Darstellung und Eigenschaften von Ca2PCl und Sr2PCl  | | | Abstract
| Alkaline Pure alkaline earth halides MX2 with M = Mg, Ca, Sr, Ba and X = C1, Br, J were prepared by reaction of the metals with the corresponding ammonium halides in N H 3 as solvent. Brown Ca2PCl and dark-brown-violet Sr2PCl were obtained by reaction of metal chloride, metal and red phosphorous in the ratio 1:3:2. Analytical results, densities and lattice constants are given. | | |
Reference
| (Z. Naturforsch. 30b, 165—168 [1975]; eingegangen am 22. Oktober/27. November 1974) | | |
Published
| 1975 | | |
Keywords
| Earth Halides, Preparation, Properties, Alkaline Earth Phosphide Chlorides | | |
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| default:Reihe_B/30/ZNB-1975-30b-0165.pdf | | | Identifier
| ZNB-1975-30b-0165 | | | Volume
| 30 | |
8 | Author
| Claus Hadenfeldt | Requires cookie* | | Title
| Darstellung und Eigenschaften von Ca2AsBr, Sr2AsCl und Ca3AsBr3 Preparation and Properties of Ca2AsBr, Sr2AsCl, and Ca3AsBr3  | | | Abstract
| Dark-brown Ca2AsBr and yellow-green Ca3AsBr3 were prepared by reaction of Ca, As, and CaBr2 at 900-1000 °C and 760-800 °C resp., dark-violet Sr2AsCl from Sr, As, and SrCl2 at 900-1000 °C. Ca2AsBr possesses an extended homogeneity range (Ca2AsBr to Ca2.5AsBr2), Sr2AsCl only a narrow one; Ca3AsBr3 is a stoichiometric compound. In contrary to Ca2AsBr Ca3AsBr3 is not stable at 1000 °C. Analytical results, densities, and lattice constants of the phases are given. | | |
Reference
| (Z. Naturforsch. 31b, 408—410 [1976]; eingegangen am 13. Oktober/1. Dezember 1975) | | |
Published
| 1976 | | |
Keywords
| Calcium Phosphide Bromides, Strontium Arsenide Chloride, Preparation, Properties | | |
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| default:Reihe_B/31/ZNB-1976-31b-0408.pdf | | | Identifier
| ZNB-1976-31b-0408 | | | Volume
| 31 | |
9 | Author
| Kurt Walenta | Requires cookie* | | Title
| ZrSi04 mit monokliner Baddeleyitstruktur ? ZrSi04 with Monoclinic Baddeleyite Structure ?  | | | Abstract
| A new compound having the same composition as zircon, ZrSiC>4, but differing from it in its structure has been obtained by heating zircon particles to a temperature of 5000 to 10000 °K. According to X-ray powder diffraction data the structure and within limits of error also the unit-cell dimensions are identical with that of monoclinic baddeleyite, Zr02. This suggests that the baddeleyite lattice can not only accommodate 10 molecular % Si02 as is already known for some time, but substantially more, unless it is assumed that some kind of submicroscopic exsolution of amorphous Si02 has taken place. | | |
Reference
| (Z. Naturforsch. 31b, 1175—1178 [1976]; eingegangen am 31. Januar/24. März 1976) | | |
Published
| 1976 | | |
Keywords
| Zircon, Synthesis, Properties, Structure, Baddeleyite Lattice | | |
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| default:Reihe_B/31/ZNB-1976-31b-1175.pdf | | | Identifier
| ZNB-1976-31b-1175 | | | Volume
| 31 | |
11 | Author
| Joachim Fuchs, Ernst-Peter Flindt | Requires cookie* | | Title
| Darstellung und Strukturuntersuchung von Polywolframaten Ein Beitrag zur Aufklärung des Parawolframations A A Contribution to the Paratungstate A Problem  | | | Abstract
| Polytungstates are obtained by the reaction of hydrated tungsten (VI) oxide with bases or salts after occasional addition of organic solvents. With liquid ammonia the as yet unknown ditungstate, (NH4)2W2Ü7, is produced. Its IR spectrum has few absorption bands suggesting a very simple constitution. Piperidine yields 5 compounds according to varied experimental conditions, which all exhibit approximately paratungstate composi-tions but different crystal habits, lattice parameters, solubility and IR spectra. Structure determinations indicate that two of these compounds are heptatungstates, the anion of which, W7024 6-, has the same structure as the heptamolybdate ion, Mo7024 6 ~. From a comparison of their Raman spectra with the spectrum of a freshly acidified sodium tungstate solution (designated as Paratungstate A) it may be concluded that the heptatungstate ion is the predominant species in such a solution. The anion structure of the previously described tributylammonium(5:24):tungstate [(GiHg^NHJsHaW^C^o was elucidated by X-ray methods. Here the tungsten atoms show the same arrangement as in the a-dodecatungstatophosphate ion (Keggin structure). | | |
Reference
| Z. Naturforsch. 34b, 412—422 (1979); eingegangen am 28. November 1978 | | |
Published
| 1979 | | |
Keywords
| Properties, X-ray, Heptatungstate, Paratungstate A, Metatungstate | | |
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| default:Reihe_B/34/ZNB-1979-34b-0412.pdf | | | Identifier
| ZNB-1979-34b-0412 | | | Volume
| 34 | |
13 | Author
| Roland Schmidt, Wolfgang Hiller, Gerhardt Pausewang | Requires cookie* | | Title
| Peroxofluorokomplexe der Übergangsmetalle, V [1-3]  | | | Abstract
| Kristallstruktur von K2Ti(02)F4 • H20 (orange) mit einem Di(/i-fluoro)diperoxo-hexafluorodititanat(IV)-Anion Transition Metal Peroxofluoro Complexes, V [1-3] Crystal Structure of K2Ti(02)F4 • HcO (orange) with a Di(J«-fluoro)diperoxo-hexafluorodititanate(IV) Anion Orange crystals of K2Ti(02)F4 ' H20 have been obtained from aqueous solution. The crystal structure (space group P2i/n, a = 604.3(3), b = 1424.6(4), c = 761.0(2) pm, ß = 103.98°, Z = 4, dc = 2.63 gem-3 , dm = 2.62 gem-3 , R = 0.051 for 2257 independent reflections) shows isolated di(ja-fluoro)-bridged [Ti2(02)2Fg] 4 -anions, which are inter-connected by hydrogen bonded H20 forming infinite chains. | | |
Reference
| Z. Naturforsch. 38b, 849—851 (1983); eingegangen am 17. März 1983 | | |
Published
| 1983 | | |
Keywords
| K2Ti(02)F4 @BULLET H20, Crystal Structure, Preparation, Properties | | |
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| default:Reihe_B/38/ZNB-1983-38b-0849.pdf | | | Identifier
| ZNB-1983-38b-0849 | | | Volume
| 38 | |
15 | Author
| S. | Requires cookie* | | Title
| Untersuchungen an Stickstoff-Jod-Verbindungen, XV1 Neue Addukte des StickstofFtrijodids mit tertiären N-Basen - Chinuclidiniumpentajodid (Chin H )J3-J2, ein neues Polyjodid  | | | Abstract
| tu d ies on N itrogen -Iod in e Com pounds, X V 1 N ew A d d u cts o f N itrogen Triiodide w ith T ertiary N -B ases -C hinuclidinium pentaiodide (Chin H)I 3 • I 2, a N ew P olyiodide J o c h e n J a n d e r , H a n s P r it z k o w u n d K l a u s -U w e T r o m m s d o r f f New adducts of nitrogen triiodide with several tertiary N-bases have been prepared. Their analyses, general properties, IR-spectra and structures are reported briefly. E x periments to crystallize a compound with a ratio N : I : chinuclidin = 1:4:1 resulted in the preparation of cristallized chinuclidiniumpentaiodide (chin H)l3 -l2 , the X-ray structure analysis of which is reported. | | |
Reference
| (Z. Naturforsch. 30b, 720—723 [1975]; eingegangen am 21. April/20. Mai 1975) | | |
Published
| 1975 | | |
Keywords
| Nitrogentriiodide, Tertiary N-bases, Adducts, Properties, Chinuclidiniumpentaiodide, X-ray | | |
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| default:Reihe_B/30/ZNB-1975-30b-0720.pdf | | | Identifier
| ZNB-1975-30b-0720 | | | Volume
| 30 | |
16 | Author
| Jochen Jander, Alexander Maurer | Requires cookie* | | Title
| Untersuchungen an Stickstoff-Iod-Verbindungen, XVII [1] Weitere tertiäre N-Basen als Stabilisatoren des Iodonium-Kations und der Iodhalogenide Studies on Nitrogen-Iodine Compounds, XVII [1] Further Tertiary N-Bases as Stabilizers of the Iodonium Cation and Iodine Halides  | | | Abstract
| The preparation and properties of the new compounds [1(2,4 lutidine)2]N03, -C104, [1(2,6 lutidine)2]N03, -C104, [1(2,4,6 collidine)2]N03, -C104, [I(TEDA)2]N03, [I(quinu-clidine)2]SbCl6, quinuclidine • IBr, quinuclidine • IC1, quinuclidine • IClSbCls, TED A • I2, I2 • TEDA • I2, and C1I • TEDA • IC1 are reported. The molecular vibrations and force constants are compared to those of similar compounds previously prepared. | | |
Reference
| Z. Naturforsch. 33b, 1446—1451 (1978); eingegangen am 3. August 1978 | | |
Published
| 1978 | | |
Keywords
| Bis-base-iodonium Salts, Mono-base-iodine Halides, Preparation, Properties, Vibrational Spectra | | |
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| default:Reihe_B/33/ZNB-1978-33b-1446.pdf | | | Identifier
| ZNB-1978-33b-1446 | | | Volume
| 33 | |
17 | Author
| Axel Thiele, Joachim Fuchs | Requires cookie* | | Title
| Struktur und Schwingungsspektren von Monomolybdaten und Monowolframaten organischer Kationen Structure and Vibrational Spectra of Monomolybdates and Monotungstates with Organic Cations  | | | Abstract
| The crystal structures of dicyclohexylammonium-monomolybdate dihydrate [(C6Hh)2NH2]2MO04 • 2 H2O, (I), cyclohexylammonium-monomolybdate, (C6HHNH3)2MO04, (II) and terf-butylammonium-monotungstate, (C4HgNH3)2W04, (III), were elucidated. In I the anion has nearly tetrahedral structure, in II one Mo-0 distance is significantly shorter than the other three, and in III all four W-0 distances are different. In spite of the variety of structures the following basic principles are recognizable: 1) Each hydrogen atom of the cationic amino groups as well as of the water of crystallization forms hydrogen bridges. 2) Never are oxygen atoms of the same M0O4 connected by these bridges, but always oxygen atoms of neighbouring M0O4 units. 3) From an oxygen atom emanate either two or no hydrogen bridge. For the investigated molybdates (tungstates) there are in all instances isomorphous tungstates (molybdates). The number and position of the vibrational bands is in good agreement with the observed anion symmetry Td, C3V and Ci, respectively. | | |
Reference
| Z. Naturforsch. 34b, 145—154 (1979); eingegangen am 23. Oktober 1978 | | |
Published
| 1979 | | |
Keywords
| Monomolybdates, Monotungstates, Organic Cations, Properties, X-ray, Vibrational Spectra | | |
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| default:Reihe_B/34/ZNB-1979-34b-0145.pdf | | | Identifier
| ZNB-1979-34b-0145 | | | Volume
| 34 | |
18 | Author
| GerhardG. Hoffmann | Requires cookie* | | Title
| Synthese und Eigenschaften von Brom(methyl)-und Iod(methyl)(organyIthio)gallanen Synthesis and Properties of Bromo(methyl)-and Iodo(methyl)(organylthio)gallanes  | | | Abstract
| The reaction between dibromo-or diiodo(methyl)gallane and the trimethylsilyl sulphides (CH 3) 3 SiSR (R = CH 3 , C 2 H 5 , A?-C 3 H 7 , I-C 3 H 7 . Ph, CH 2 Ph) have been investigated. Halo(methyl)-(organylthio)gallanes are formed. These compounds and their chloro analogues can also be obtained by the reactions between the dihalo(methyl)gallanes and the corresponding leaddi-(thiolates) in the molar ratios 2:1, or from the halo(dimethyl)gallanes and free thiols. Some physical and chemical properties of the new compounds are given, and the tentative mechanisms of these reactions are discussed. Syntheses of methylgalliumdiiodide and dimethylgalliumhalides via trimethylgallane und galliumtrihalides or methylgalliumdihalides are described. | | |
Reference
| Z. Naturforsch. 40b, 335—342 (1985); eingegangen am 5. Oktober 1984 | | |
Published
| 1985 | | |
Keywords
| Organogallium Derivatives, Trimethylsilyl Sulphides, Leaddi(thiolates), Synthesis, Properties | | |
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| default:Reihe_B/40/ZNB-1985-40b-0335.pdf | | | Identifier
| ZNB-1985-40b-0335 | | | Volume
| 40 | |
|