Technische Universität Berlin

7558 Items

Recent Submissions
Benchmarking dataflow systems for scalable machine learning

Boden, Christoph (2018)

The popularity of the world wide web and its ubiquitous global online services have led to unprecedented amounts of available data. Novel distributed data processing systems have been developed in order to scale out computations and analysis to such massive data set sizes. These "Big Data Analytics" systems are also popular choices to scale out the execution of machine learning algorithms. Howe...

Phthalocyanine-fullerene dyads and DNA interstrand cross-linking on surface

Véliz Montes, Cinthya Yamila (2018)

Nanotechnology deals with structures and components of nanoscale size in order to create new properties or to improve significantly their physical, chemical and biological properties, processes and phenomena. Many efforts of molecular nanotechnology are directed to design artificial nanostructures on surfaces due to their potential applications in nanodevices and biosensors. This thesis include...

Studies on the Biosynthesis of γ–Decalactone in Sporobolomyces odorus

Albrecht, Wolfgang ; Tressl, Roland (1990)

Incubation of racemic ethyl [2,2-2H2]-(E)-3,4-epoxydecanoate and the corresponding acid with intact cells of Sporobolomyces odorus led to the formation of deuterium labeled γ-decalaetone. The detection of labeled 2-decen-4-olide and 4-oxodecanoic acid made it possi­ble to propose the biogenetic sequence leading to γ-decalactone. The determination of the en­ antiomeric ratio of the lactone revea...

The Viscosity Coefficients of Biaxial-Nematic Liquid Crystals. Phenomenology and Affine Transformation Model

Baalss, Dieter (1990)

The viscosity tensor of biaxial-nematic liquid crystals contains 16 independent elements. A complete set of these viscosity coefficients is introduced and related to experimentally accessible quantities. Furthermore, the flow alignment and its stability against an arbitrary infinitesimal disturbance are discussed. By the affine transformation model, formerly established for the uniaxial symmetr...

Studies on Herbicide Binding in Photosystem II Membrane Fragments from Spinach

Fromme, R. ; Renger, G. (1990)

The mechanism of atrazine binding and its modification by Chelex-100-induced Ca2+ depletion and proteolytic degradation by trypsin, was analyzed in PS II membrane fragments from spinach. It was found: 1) Chelex-100 treatment leads in a comparatively slow process (t1/2 = 5 - 10 min) to Ca2+ re moval from a site that is characterized by a high affinity as reflected by KD values of the order of 10...

Test von FDDI-Systemen auf Standardkonformität und Interoperabilität im EANTC

Almus, Herbert (1992)

Die Entwicklung im Bereich der EDV-Systeme hat insbesondere durch die Verfügbarkeit leistungsfähiger Arbeitsplatzrechner dazu geführt, daß die Funktion der diese Systeme verbindenden Netzwerke von erheblicher Bedeutung für die Leistungsfähigkeit eines Unternehmens geworden ist. Innerhalb einer Organisation werden oftmals Systeme verschiedenster Hersteller eingesetzt, wodurch die Interoperabili...

The Flash Pattern of Photosynthetic Oxygen Evolution after Treatment with Low Concentrations of Hydroxylamine as a Function of the Previous S1/S0-Ratio Further Evidence that NH2OH Reduces the Water Oxidizing Complex in the Dark

Messinger, J. ; Pauly, S. ; Witt, H. T. (1991)

Flash induced oxygen evolution patterns of isolated PS II complexes from the cyanobacterium Synechococcus were measured with a Joliot-type electrode. By suitable preflash and dark adaptation procedures, samples were prepared in the state S1 (100%), as well as enriched in S0 (60% S0, 40% S,). After treatment with low concentrations of NH2OH (≤ 100 μм), the two flash patterns were identical. This...

Static and Dynamic Properties of Ferroelectric Liquid Crystals in the Vicinity of a First-Order SmA-SmC* Phase Transition

Netz, Roland R. ; Hess, Siegfried (1992)

A unified theoretical description of static and dynamic properties of ferroelectric liquid crystals in terms of a Landau free energy is presented. The shear deformation tensor is used as principal order parameter. Results for the stationary case for tilt angle variation and dielectric properties are compared with experiments on a compound with a pronounced first-order SmA-SmC* phase transition ...

Effect of Tentoxin on the Activation and on the Catalytic Reaction of Reconstituted H+-ATPase from Chloroplasts

Fromme, Petra ; Dahse, Ingo ; Gräber, Peter (1992)

The proton-translocating ATPase from chloroplasts, CF0F1, was isolated, purified and reconstituted into asolectin liposomes. The effect of the energy transfer inhibitor, tentoxin, on different functions of the enzyme was investigated. Tentoxin does not inhibit the nucleotide release during energization by a pH /ΔΨ jump, i.e. the activation of the enzyme is not influenced. ATP synthesis driven b...

1-[4-{1,1′,1″,1‴,1′′′′-(1,3-Cyclopentadien-1,2,3,4,5-pentayl)pentakis}]-(4,1-phenylen)-alkanone und -benzoesäure pentaalkylester und deren Natrium- und Thallium(I)-Komplexe

Schumann, Herbert ; Kucht, Homa ; Kucht, Andreas (1992)

Pentaphenylcyclopentadiene (1) reacts with acyl chlorides RC(O)Cl (R = CH3, C3H7, C5H11, C7H15) with formation of the corresponding [(cyclopentadiene pentayl)pentakis] (1,4-phenylene) alkanones C5H(C6H4C(O)R-4)5 (2a, 2c, 2d and 2e). 2 a reacts with KOCl in water/dioxane to yield C5Cl(C6H4C(O)OH-4)5 (3), which after reaction with C2H5OH and C5H11OH gives the pentaesters C5Cl(C6H4C(O)OR-4)5 (4b a...

Photosystem II: Thermodynamics and Kinetics of Electron Transport from QA- to QB(QB- ) and Deleterious Effects of Copper(II)

Renger, G. ; Gleiter, H. M. ; Haag, E. ; Reifarth, F. (1993)

Studies on thermodynamics and kinetics of electron transfer from QA- to QB(QB-) were performed by monitoring laser flash induced changes of the relative fluorescence emission as a function of temperature (220 K < T < 310 K) in isolated thylakoids and PS II membrane fragments. In addition, effects of bivalent metal ions on PS II were investigated by measuring conventional fluorescence induction ...

X-Ray Structural Analysis and Vibrational Spectra of Sodium Cysteine-S-sulfonate, +H3NCH(COO-)CH2S2O3Na • 3/2H2O [1]

Steudel, Ralf ; Albertsen, Angela ; Kustos, Monika ; Pickardt, Joachim (1993)

The title compound crystallizes orthorhombically (space group C 2221) with a = 797.0, b = 870.3 and c = 2739.0 pm. The anions are zwitterions which are heavily involved in intra- and intermolecular NH •••O and OH•••O hydrogen bonding. The two types of sodium cations are coordinated by six oxygen atoms each of which belongs to either SO3 groups (Na 2) or water molecules and SO3 groups (Na1). A s...

The Bishydridobis(tetrazol-1-yl)borate Anion, [H2B(CHN4)2]-: Synthesis and Structure of the First Tetrazolylborate

Janiak, Christoph ; Esser, Lothar (1993)

Potassium bishydridobis(tetrazol-1-yl)borate (1) has been synthesized from KBH4 and tetrazole and characterized spectroscopically. Its crystal structure has been determined. 1 crystallizes in the monoclinic space group P21/n with a = 537.8(2), b = 1703.5(9), c = 919.6(3) pm, β = 106.12(3)° and V = 809.4(6)· 106 pm3.

Metallkomplexe mit 1,4,7-Trithiacyclononan: Kristallstrukturen von [CdI2 · C6H12S3]2 und [Hg(C6H12S3)2](HgI3)2

Pickardt, Joachim ; Shen, Jing (1993)

Crystals of the complexes [CdI2 · C6H12S3]2 (1) and [Hg(C6H12S3)2](HgI3)2 (2) were obtained by diffusion of 1,4,7-trithiacyclononane (9 S 3) in ethanol into aqueous solutions of cadmium iodide and mercuric iodide/potassium iodide, resp. Both compounds crystallize monoclinically,1: space group P21/n, Z = 4, a = 1207.1(5), b = 909.9(2), c = 1240.3(7) pm, β = 92.59(9)°; 2: P21/c, Z = 2, a = 804.7(...

Kristallstruktur des „supramolekularen“ Silber(I)thiocyanat-Cyclam-Komplexes [Ag(SCN)·(C10H24N4)1/2]

Pickardt, Joachim ; Shen, Jing (1994)

Colourless crystals of the 1,4,8,11-tetraazacyclotetradecane (cyclam) silver(I) thiocyanate complex [Ag(SCN) · (C10H24N4)1/2] were obtained by diffusion of a solution of cyclam in ethanol into an aqueous solution of K[Ag(SCN)2], The crystals are tetragonal, space group P42/n, Z = 8, a = b - 1256.0(4), c = 1185.5(9) pm. The SCN groups act as μ3 ligands, the S atoms of two SCN groups bridge two n...

Kristallstruktur des „supramolekularen“ Quecksilber(II)chlorid-thiocyanat- Hexamethylentetramin-Addukts Hg(SCN)2 · 2HgCl2 · 2C6H12N4

Pickardt, Joachim ; Gong, Gill-Taik ; Röleke, Dietmar (1994)

Crystals of the adduct Hg(SCN)2 · 2HgCl2·2C6H12N4 were obtained from an aqueous solution containing 0.1 mol/l hexamethylenetetramine and 0.05 mol/l potassium thiocyanate and mercury(II) chloride. The compound crystallizes monoclinically; space group P21/n, a = 767.3(4), b = 1854.7(7), c = 872.5(7) pm, and β = 101.48(5)°. The structure consists of a net­work of chains -Cl-Hg-Cl-Hg- and -(Cl-Hg-)...

Kristallstruktur zweier Zinkthiocyanat-Hexamethylentetramin-Addukte, Zn(SCN)2 · (C6H12N4)2 und {Zn(SCN)2 · C6H12N4 · 2H2O}n, mit unterschiedlich koordinierten Zinkionen

Pickardt, Joachim ; Gong, Gill-Taik ; Wischnack, Sabine ; Steinkopff, Christina (1994)

Crystals of the adducts Zn(SCN)2 · (C6H12N4)2 (1), and {Zn(SCN)2 · C6H12N4 · 2H2O}n (2) were obtained by crystallization from aqueous solutions containing hexamethylenetetrami­ne, potassium thiocyanate and zinc nitrate or zinc sulfate, resp., under identical conditions, as two totally different products. 1 crystallizes orthorhombically, space group P nmm, Z = 2, a = 622.4(5), b = 1152.3(7), c =...

Kristallstrukturen der [2.2.2]Cryptate [Cd(cryptand 222)][CdCl4] und [Hg(cryptand 222)][Hg2Cl6] mit achtfach koordinierten Metallionen

Pickardt, Joachim ; Kühn, Britta (1994)

Reactions of [2.2.2]cryptand, 4,7,13,16,21,24-Hexaoxa-1,10-diazabicyclo-[8.8.8]hexacosane, (“cryptand 222”) with cadmium chloride and mercuric chloride yielded crystals of [Cd(cryptand 222)][CdCl4] (1) and [Hg(cryptand 222)][Hg2Cl6] (2). 1 crystallizes tetragonally, space group P42/n, Z = 4, a = 1239.8(2), c = 1801.2(8) pm; 2 is monoclinic, space group P2/n, Z = 2, a = 1060.3(3), b = 955.2(2), ...

Mößbauer-Untersuchung ferrimagnetischer Spinelle des Systems CdϰNi1-ϰFe2O4

Riedel, E. ; Prick, D. ; Wolska, E. (1994)

Room temperature Mößbauer spectra of ferrimagnetic spinels in the system Cdϰ2+Fe1-ϰ3+[Ni1-ϰ2+Fe1-ϰ3+]O4 have been interpreted using the polyhedron model which is based on six different environments at the A-site for the B-site Fe3+-ions. To each environment belongs one sextet with a characteristic magnetic splitting. An additional sextet is due to Fe3+-ions at the A-site.

Binuclear Manganese(III) Complexes as Electron Donors in D1/D2/Cytochrome b559 Preparations Isolated from Spinach Photosystem II Membrane Fragments

Allakhverdiev, S. I. ; Karacan, M. S. ; Somer, G. ; Karacan, N. ; Khan, E. M. ; Rane, S. Y. ; Padhye, S. ; Klimov, V. V. ; Renger, G. (1994)

The capability of different manganese complexes to act as PS II electron donors in D1/D2/ cytochrome b 559 complexes has been analyzed by measuring actinic light-induced absorption changes at 680 nm (650 nm) and 340 nm, reflecting the photoaccumulation of Pheophytin- (Pheo-) and the reduction of NADP+ respectively. The data obtained reveal: a) the donor capacity of synthetic binuclear Mn(III)2 ...