ZIB

1

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Supporting Global Numerical Optimization of Rational Functions by Generic Symbolic Convexity Tests (2010)

Neun, Winfried ; Sturm, Thomas ; Vigerske, Stefan

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Publication Date: 2020-12-11

Description: Convexity is an important property in nonlinear optimization since it allows to apply efficient local methods for finding global solutions. We propose to apply symbolic methods to prove or disprove convexity of rational functions over a polyhedral domain. Our algorithms reduce convexity questions to real quantifier elimination problems. Our methods are implemented and publicly available in the open source computer algebra system REDUCE. Our long term goal is to integrate REDUCE as a workhorse'' for symbolic computations into a numerical solver.

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2

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Fault-Tolerant and Decentralized Lease Coordination in Distributed Systems (2010)

Kolbeck, Björn ; Högqvist, Mikael ; Stender, Jan ; [et al.]

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Publication Date: 2016-06-30

Description: Applications which need exclusive access to a shared resource in distributed systems require a fault-tolerant and scalable mechanism to coordinate this exclusive access. Examples of such applications include distributed file systems and master/slave data replication. We present Flease, an algorithm for decentralized and fault-tolerant lease coordination in distributed systems. Our algorithm allows the processes competing for a resource to coordinate exclusive access through leases among themselves without a central component. The resulting system easily scales with an increasing number of nodes and resources. We prove that Flease ensures exclusive access, i.e. guarantees that there is at most one valid lease at any time.

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3

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Robust Tail Assignment (2010)

Borndörfer, Ralf ; Dovica, Ivan ; Nowak, Ivo ; [et al.]

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Publication Date: 2020-08-05

Description: We propose an efficient column generation method to minimize the probability of delay propagations along aircraft rotations. In this way, delay resistant schedules can be constructed. Computational results for large-scale real-world problems demonstrate substantial punctuality improvements. The method can be generalized to crew and integrated scheduling problems.

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4

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State Trajectory Compression for Optimal Control with Parabolic PDEs (2010)

Weiser, Martin ; Götschel, Sebastian

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Publication Date: 2022-01-07

Description: In optimal control problems with nonlinear time-dependent 3D PDEs, full 4D discretizations are usually prohibitive due to the storage requirement. For this reason gradient and quasi-Newton methods working on the reduced functional are often employed. The computation of the reduced gradient requires one solve of the state equation forward in time, and one backward solve of the adjoint equation. The state enters into the adjoint equation, again requiring the storage of a full 4D data set. We propose a lossy compression algorithm using an inexact but cheap predictor for the state data, with additional entropy coding of prediction errors. As the data is used inside a discretized, iterative algorithm, lossy coding maintaining an error bound is sufficient.

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5

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A simple mathematical model of the bovine estrous cycle: follicle development and endocrine interactions (2010)

Boer, H. Marike T. ; Stötzel, Claudia ; Röblitz, Susanna ; [et al.]

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Publication Date: 2020-03-11

Description: Bovine fertility is the subject of extensive research in animal sciences, especially because fertility of dairy cows has declined during the last decades. The regulation of estrus is controlled by the complex interplay of various organs and hormones. Mathematical modeling of the bovine estrous cycle could help in understanding the dynamics of this complex biological system. In this paper we present a mathematical model of the bovine estrous cycle that includes the processes of follicle and corpus luteum development and the key hormones that interact to control these processes. Focus in this paper is on development of the model, but also some simulation results are presented, showing that a set of equations and parameters is obtained that describes the system consistent with empirical knowledge. Even though the majority of the mechanisms that are included are only known qualitatively as stimulatory or inhibitory effects, the model surprisingly well features quantitative observations made in reality. This model of the bovine estrous cycle could be used as a basis for more elaborate models with the ability to study effects of external manipulations and genetic differences.

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6

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Rapid Learning for Binary Programs (2010)

Berthold, Timo ; Feydy, Thibaut ; Stuckey, Peter

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Publication Date: 2022-03-14

Description: Learning during search allows solvers for discrete optimization problems to remember parts of the search that they have already performed and avoid revisiting redundant parts. Learning approaches pioneered by the SAT and CP communities have been successfully incorporated into the SCIP constraint integer programming platform. In this paper we show that performing a heuristic constraint programming search during root node processing of a binary program can rapidly learn useful nogoods, bound changes, primal solutions, and branching statistics that improve the remaining IP search.

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7

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Models for Line Planning with Transfers (2010)

Borndörfer, Ralf ; Neumann, Marika

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Publication Date: 2020-08-05

Description: We propose a novel integer programming approach to transfer minimization for line planning problems in public transit. The idea is to incorporate penalties for transfers that are induced by “connection capacities” into the construction of the passenger paths. We show that such penalties can be dealt with by a combination of shortest and constrained shortest path algorithms such that the pricing problem for passenger paths can be solved efficiently. Connection capacity penalties (under)estimate the true transfer times. This error is, however, not a problem in practice. We show in a computational comparison with two standard models on a real-world scenario that our approach can be used to minimize passenger travel and transfer times for large-scale line planning problems with accurate results.

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8

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Adaptive Timestep Control for the Contact-Stabilized Newmark Method (2010)

Klapproth, Corinna ; Schiela, Anton ; Deuflhard, Peter

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Publication Date: 2016-06-09

Description: The aim of this paper is to devise an adaptive timestep control in the contact--stabilized Newmark method (CONTACX) for dynamical contact problems between two viscoelastic bodies in the framework of Signorini's condition. In order to construct a comparative scheme of higher order accuracy, we extend extrapolation techniques. This approach demands a subtle theoretical investigation of an asymptotic error expansion of the contact--stabilized Newmark scheme. On the basis of theoretical insight and numerical observations, we suggest an error estimator and a timestep selection which also cover the presence of contact. Finally, we give a numerical example.

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9

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Railway capacity auctions with dual prices (2010)

Schlechte, Thomas ; Tanner, Andreas

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Publication Date: 2020-08-05

Description: Railway scheduling is based on the principle of the construction of a conflict-free timetable. This leads to a strict definition of capacity: in contrast with road transportation, it can be said in advance whether a given railway infrastructure can accommodate - at least in theory - a certain set of train requests. Consequently, auctions for railway capacity are modeled as auctions of discrete goods -- the train slots. We present estimates for the efficiency gain that may be generated by slot auctioning in comparison with list price allocation. We introduce a new class of allocation and auction problems, the feasible assignment problem, that is a proper generalization of the well-known combinatorial auction problem. The feasible assignment class was designed to cover the needs for an auction mechanism for railway slot auctions, but is of interest in its own right. As a practical instance to state and solve the railway slot allocation problem, we present an integer programming formulation, briefly the ACP, which turns out to be an instance of the feasible assignment problem and whose dual problem yields prices that can be applied to define a useful activity rule for the linearized version of the Ausubel Milgrom Proxy auction. We perform a simulation aiming to measure the impact on efficiency and convergence rate.

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10

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Solving Optimal Control Problems with the Kaskade 7 Finite Element Toolbox (2010)

Götschel, Sebastian ; Weiser, Martin ; Schiela, Anton

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Publication Date: 2022-01-07

Description: This paper presents concepts and implementation of the finite element toolbox Kaskade 7, a flexible C++ code for solving elliptic and parabolic PDE systems. Issues such as problem formulation, assembly and adaptivity are discussed at the example of optimal control problems. Trajectory compression for parabolic optimization problems is considered as a case study.

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11

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Aggregation Methods for Railway Networks (2010)

Borndörfer, Ralf ; Erol, Berkan ; Graffagnino, Thomas ; [et al.]

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Publication Date: 2020-08-05

Description: In this paper a bottom-up approach of automatic simplification of a railway network is presented. Starting from a very detailed, microscopic level, as it is used in railway simulation, the network is transformed by an algorithm to a less detailed level (macroscopic network), that is sufficient for long-term planning and optimization. In addition running and headway times are rounded to a pre-chosen time discretization by a special cumulative method, which we will present and analyse in this paper. After the transformation we fill the network with given train requests to compute an optimal slot allocation. Then the optimized schedule is re-transformed into the microscopic level and can be simulated without any conflicts occuring between the slots. The algorithm is used to transform the network of the very dense Simplon corridor between Swiss and Italy. With our aggregation it is possible for the first time to generate a profit maximal and conflict free timetable for the corridor across a day by a simultaneously optimization run.

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12

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Merging solutions of non-linear algebraic systems (2010)

Wolf, Thomas

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Publication Date: 2020-12-11

Description: In solving large polynomial algebraic systems that are too big for standard Gröbner basis techniques one way to make progress is to introduce case distinctions. This divide and conquer technique can be beneficial if the algorithms and computer programs know how to take advantage of inequalities. A further hurdle is the form of the resulting general solutions which often have unnecessarily many branches. In this paper we discuss a procedure to merge solutions by dropping inequalities which are associated with them and, if necessary, by re-parametrizing solutions. In the appendix the usefulness of the procedure is demonstrated in the classification of quadratic Hamiltonians with a Lie-Poisson bracket $e(3)$. This application required the solution of algebraic systems with over 200 unknowns, 450 equations and between 5000 and 9000 terms.

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13

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A Dynamical Systems Approach for Static Evaluation in Go (2010)

Wolf, Thomas

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Publication Date: 2020-12-11

Description: In the paper arguments are given why the concept of static evaluation (SE) has the potential to be a useful extension to Monte Carlo tree search. A new concept of modeling SE through a dynamical system is introduced and strengths and weaknesses are discussed. The general suitability of this approach is demonstrated. A Remark: Among users of the Internet Go server KGS the abbreviation SE is used for 'Score Estimator'. Although different from 'Static Evaluation' a score estimator is easily obtained from static evaluation by adding up probabilities of chains to be alive at the end of the game or points to be owned by White or Black

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14

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Classification of integrable quadratic Hamiltonians on e(3) (2010)

Wolf, Thomas ; Efimovskaya, Olya V.

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Publication Date: 2020-12-11

Description: Linear Poisson brackets on e(3) typical of rigid body dynamics are considered. All quadratic Hamiltonians of Kowalevski type having additional first integral of fourth degree are found. Quantum analogs of these Hamiltonians are listed.

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15

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Classification of integrable super-systems using the SsTools environment (2010)

Kiselev, A. V. ; Wolf, Thomas

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Publication Date: 2020-12-11

Description: A classification problem is proposed for supersymmetric %scaling\/-\/in\-va\-ri\-ant evolutionary PDE that satisfy the assumptions of nonlinearity, nondegeneracy, and homogeneity. Four classes of nonlinear coupled boson\/-\/fermion systems are discovered under the weighting assumption $|f|=|b|=|D_t|=\oh$. The syntax of the \Reduce\ package \SsTools, which was used for intermediate computations, and the applicability of its procedures to the calculus of super\/-\/PDE are described.

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16

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N=2 supersymmetric a=4-KdV hierarchy derived via Gardner's deformation of Kaup-Boussinesq equation (2010)

Hussin, V. ; Kiselev, A. V. ; Krutov, A.O. ; [et al.]

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Publication Date: 2020-12-11

Description: We consider the problem of constructing Gardner's deformations for the $N{=}2$ supersymmetric $a{=}4$--\/Korteweg\/--\/de Vries equation; such deformations yield recurrence relations between the super\/-\/Hamiltonians of the hierarchy. We prove the non\/-\/existence %P.~Mathieu's Open problem on constructing for of supersymmetry\/-\/invariant %Gardner's deformations that %solutions, retract to Gardner's formulas for the KdV equation %whenever it is assumed that, under the %respective component reduction. % in the $N{=}2$ super\/-\/field. the solutions . At the same time, we propose a two\/-\/step scheme for the recursive production of the integrals of motion for the $N{=}2$,\ $a{=}4$--\/SKdV. First, we find a new Gardner's deformation of the Kaup\/--\/Boussinesq equation, which is contained in the bosonic limit of the super\/-\/%$N{=}2$,\ $a{=}4$--\/SKdV hierarchy. This yields the recurrence relation between the Hamiltonians of the limit, whence we determine the bosonic super\/- /Hamiltonians of the full $N{=}2$, $a{=}4$--\/SKdV hierarchy.

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17

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The Quickest Path to the Goal (2010)

Borndörfer, Ralf ; Grötschel, Martin ; Löbel, Andreas

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Publication Date: 2020-08-05

Description: We provide an introduction into the mathematics of and with paths. Not on the shortest, but hopefully on an entertaining path!

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18

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Linienoptimierung - reif für die Praxis? (2010)

Borndörfer, Ralf ; Neumann, Marika

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Publication Date: 2020-08-05

Description: Wir stellen in dieser Arbeit ein mathematisches Optimierungsmodell zur Bestimmung eines optimalen Linienplans vor, das sowohl die Fahrzeiten und die Anzahl der Umstiege berücksichtigt als auch die Kosten des Liniennetzes. Dieses Modell deckt wichtige praktische Anforderungen ab, die in einem gemeinsamen Projekt mit den Verkehrsbetrieben in Potsdam (ViP) formuliert wurden. In diesem Projekt wurde der Linienplan 2010 für Potsdam entwickelt. Unsere Berechnungen zeigen, dass die mathematische Optimierung in nichts einer "Handplanung" des Liniennetzes nachsteht. Im Gegenteil, mit Hilfe des Optimierungsprogramms ist es möglich, durch Veränderung der Parameter mehrere verschiedene Szenarien zu berechnen, miteinander zu vergleichen und Aussagen über minimale Kosten und Fahrzeiten zu machen.

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Language: German

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19

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Positions in the Game of Go as Complex Systems (2010)

Wolf, Thomas

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Publication Date: 2020-12-11

Description: The paper gathers evidence showing different dimensions of the game of Go: the continuous and discrete nature of the game and different types of relations between state variables happening on ultra local, local, regional, and global scales. Based on these observations a new continuous local model for describing a board position is introduced. This includes the identification of the basic variables describing a board position and the formulation and solution of a dynamical system for their computation. To be usable as a static evaluation function for a game playing program at least group-wide (regional)aspects will have to be incorporated.

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20

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Railway Track Allocation by Rapid Branching (2010)

Borndörfer, Ralf ; Schlechte, Thomas ; Weider, Steffen

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Publication Date: 2020-08-05

Description: The track allocation problem, also known as train routing problem or train timetabling problem, is to find a conflict-free set of train routes of maximum value in a railway network. Although it can be modeled as a standard path packing problem, instances of sizes relevant for real-world railway applications could not be solved up to now. We propose a rapid branching column generation approach that integrates the solution of the LP relaxation of a path coupling formulation of the problem with a special rounding heuristic. The approach is based on and exploits special properties of the bundle method for the approximate solution of convex piecewise linear functions. Computational results for difficult instances of the benchmark library TTPLIB are reported.

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21

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Optimizing the Simplon Railway Corridor (2010)

Borndörfer, Ralf ; Erol, Berkan ; Graffagnino, Thomas ; [et al.]

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Publication Date: 2020-08-05

Description: This paper presents a case study on a railway timetable optimization for the very dense Simplon corridor, a major railway connection in the Alps between Switzerland and Italy. Starting from a detailed microscopic network as it is used in railway simulation, the data is transformed by an automatic procedure to a less detailed macroscopic network, that is sufficient for the purpose of capacity planning and amenable to state-of-the-art integer programming optimization methods. In this way, the macroscopic railway network is saturated with trains. Finally, the corresponding timetable is re-transformed to the microscopic level in such a way that it can be operated without any conflicts among the slots. Using this integer programming based micro-macro aggregation-disaggregation approach, it becomes for the first time possible to generate a profit maximal and conflict free timetable for the complete Simplon corridor over an entire day by a simultaneous optimization of all trains requests. This also allows to to undertake a sensitivity analysis of various problem parameters.

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22

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Analysis of a multi-scale asymptotic model for internal gravity waves in a moist atmosphere (2010)

Ruprecht, Daniel

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Publication Date: 2016-06-09

Description: The thesis presents the analysis of a reduced model for modulation of internal gravity waves by deep convective clouds. The starting point for the derivation are conservation laws for mass, momentum and energy coupled with a bulk micro-physics model describing the evolution of mixing ratios of water vapor, cloud water and rain water. A reduced model for the identified scales of the regime is derived, using multi-scale asymptotics. The closure of the model employs conditional averaging over the horizontal scale of the convective clouds. The resulting reduced model is an extension of the anelastic equations, linearized around a constant background state, which are well-known from meteorology. The closure of the model is achieved purely by analytical means and involves no additional physically motivated assumptions. The essential new parameter arising from the coupling to a micro-physics model is the area fraction of saturated regions on the horizontal scale of the convective clouds. It turns out that this parameter is constant on the employed short timescale. Hence the clouds constitute a constant background, modulating the characteristics of propagation of internal waves. The model is then investigated by analytical as well as numerical means. Important results are, among others, that in the model moisture (i) inhibits propagation of internal waves by reducing the modulus of the group velocity, (ii) reduces the angle between the propagation direction of a wave-packet and the horizontal, (iii) causes critical layers and (iv) introduces a maximum horizontal wavelength beyond which waves are no longer propagating but become evanescent. The investigated examples of orographically generated gravity waves also feature a significant reduction of vertical momentum flux by moisture. The model is extended by assuming systematically small under-saturation, that is saturation at leading order. The closure is similar to the original case but requires additional assumptions. The saturated area fraction in the obtained model is no longer constant but now depends nonlinearly on vertical displacement and thus on vertical velocity.

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Language: English

Type: doctoralthesis , doc-type:doctoralThesis

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23

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A Constraint Integer Programming Approach for Resource-Constrained Project Scheduling (2010)

Berthold, Timo ; Heinz, Stefan ; Lübbecke, Marco ; [et al.]

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Publication Date: 2022-03-14

Description: We propose a hybrid approach for solving the resource-constrained project scheduling problem which is an extremely hard to solve combinatorial optimization problem of practical relevance. Jobs have to be scheduled on (renewable) resources subject to precedence constraints such that the resource capacities are never exceeded and the latest completion time of all jobs is minimized. The problem has challenged researchers from different communities, such as integer programming (IP), constraint programming (CP), and satisfiability testing (SAT). Still, there are instances with 60 jobs which have not been solved for many years. The currently best known approach, lazyFD, is a hybrid between CP and SAT techniques. In this paper we propose an even stronger hybridization by integrating all the three areas, IP, CP, and SAT, into a single branch-and-bound scheme. We show that lower bounds from the linear relaxation of the IP formulation and conflict analysis are key ingredients for pruning the search tree. First computational experiments show very promising results. For five instances of the well-known PSPLIB we report an improvement of lower bounds. Our implementation is generic, thus it can be potentially applied to similar problems as well.

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24

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Coupling Meshbased and Meshfree Methods by a Transfer Operator Approach (2010)

Fackeldey, Konstantin

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Publication Date: 2023-11-03

Description: In contrast to the well known meshbased methods like the finite element method, meshfree methods do not rely on a mesh. However besides their great applicability, meshfree methods are rather time consuming. Thus, it seems favorable to combine both methods, by using meshfree methods only in a small part of the domain, where a mesh is disadvantageous, and a meshbased method for the rest of the domain. We motivate, that this coupling between the two simulation techniques can be considered as saddle point problem and show the stability of this coupling. Thereby a novel transfer operator is introduced, which interacts in the transition zone, where both methods coexist.

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25

Book

Bayesian nonparametrics /; 28 (2010)

Hjort, Nils Lid

Cambridge, UK :Cambridge University Press,

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Title: Bayesian nonparametrics /; 28

Contributer: Hjort, Nils Lid

Publisher: Cambridge, UK :Cambridge University Press,

Year of publication: 2010

Pages: viii, 299 p.

Series Statement: Cambridge series on statistical and probabilistic mathematics 28

ISBN: 0-521-51346-4 , 978-0-521-51346-3

Type of Medium: Book

Language: English

Keywords: ‡aBayesian statistical decision theory ; ‡aNonparametric statistics

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ZIB Catalog

Zuse Institute Berlin

26

Electronic Resource

Rapport du Comité de la Société suisse de Chimie pour l'année 1943 (1944)

Cherbuliez, Emile

New York, NY : Wiley-Blackwell

Helvetica Chimica Acta 27 (1944), S. 814-815

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ISSN: 0018-019X

Keywords: Chemistry ; Organic Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/hlca.194402701101

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Paper (German National Licenses)

Fulltext

27

Electronic Resource

Procès-verbal (1944)

Cherbuliez, E. ; Georg, Alfr.

New York, NY : Wiley-Blackwell

Helvetica Chimica Acta 27 (1944), S. 811-813

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ISSN: 0018-019X

Keywords: Chemistry ; Organic Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/hlca.194402701100

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Fulltext

28

Electronic Resource

Bericht zur Jahresrechnung per 31. Dezember 1943 (1944)

New York, NY : Wiley-Blackwell

Helvetica Chimica Acta 27 (1944), S. 816-818

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ISSN: 0018-019X

Keywords: Chemistry ; Organic Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/hlca.194402701102

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Fulltext

29

Electronic Resource

Décision du Comité de rédaction des Helvetica Chimica Acta (1944)

New York, NY : Wiley-Blackwell

Helvetica Chimica Acta 27 (1944), S. 819-819

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ISSN: 0018-019X

Keywords: Chemistry ; Organic Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/hlca.194402701103

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Beschluss des Redaktionskomitees der Helvetica Chimica Acta (1944)

New York, NY : Wiley-Blackwell

Helvetica Chimica Acta 27 (1944), S. 819-819

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Keywords: Chemistry ; Organic Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

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URL: http://dx.doi.org/10.1002/hlca.194402701104

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Errata (1944)

New York, NY : Wiley-Blackwell

Helvetica Chimica Acta 27 (1944), S. 820-820

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URL: http://dx.doi.org/10.1002/hlca.194402701106

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32

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Bei der Redaktion eingelaufene Bücher: (Die Redaktion verpflichtet sich nicht zur Besprechung der eingesandten Werke.) (1944)

New York, NY : Wiley-Blackwell

Helvetica Chimica Acta 27 (1944), S. 820-820

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Keywords: Chemistry ; Organic Chemistry

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URL: http://dx.doi.org/10.1002/hlca.194402701105

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33

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Über Bestandteile der Nebennierenrinde und verwandte Stoffe. 68. Mitteilung. Pregnandiol-(3 α, 11 α)-on-(20) und Pregnandiol-(3 β, 11 α)-on-(20) (1944)

von Euw, J. ; Lardon, A. ; Reichstein, T.

New York, NY : Wiley-Blackwell

Helvetica Chimica Acta 27 (1944), S. 821-839

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Keywords: Chemistry ; Organic Chemistry

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URL: http://dx.doi.org/10.1002/hlca.194402701107

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34

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Recherches sur l'amidon. XXVI. Sur la phosphorylase de pommes de terre (1944)

Meyer, Kurt H. ; de Traz, Cl.

New York, NY : Wiley-Blackwell

Helvetica Chimica Acta 27 (1944), S. 840-842

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Additional Material: 2 Ill.

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URL: http://dx.doi.org/10.1002/hlca.194402701108

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Recherches sur l'amidon. XXVII. Prescription pour la préparation de glucose-1-phosphate (1944)

Bernfeld, P. ; de Traz, Cl. ; Gautier, Ch.

New York, NY : Wiley-Blackwell

Helvetica Chimica Acta 27 (1944), S. 843-844

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Keywords: Chemistry ; Organic Chemistry

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URL: http://dx.doi.org/10.1002/hlca.194402701109

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Propriétés des polymères en solution XVII. Analyse thermodynamique de systèmes binaires à un composant caténiforme (1944)

Meyer, Kurt H. ; van der Wyk, A. J. A.

New York, NY : Wiley-Blackwell

Helvetica Chimica Acta 27 (1944), S. 845-858

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Keywords: Chemistry ; Organic Chemistry

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Additional Material: 6 Ill.

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URL: http://dx.doi.org/10.1002/hlca.194402701110

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37

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Lösungsgleichgewichte in wässrigen Systemen. (4. Mitteilung). Das System CO2—NH3—H2O bei 20°-50° (1944)

Guyer, A. ; Piechowiez, T.

New York, NY : Wiley-Blackwell

Helvetica Chimica Acta 27 (1944), S. 858-867

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Keywords: Chemistry ; Organic Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

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Additional Material: 6 Ill.

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URL: http://dx.doi.org/10.1002/hlca.194402701111

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38

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Contribution à l'étude de l'acide 5, 8-dichloro-2-naphtoïque et de la 5, 8-dichloro-2-naphtylamine (1944)

Goldstein, Henri ; Viaud, Pierre

New York, NY : Wiley-Blackwell

Helvetica Chimica Acta 27 (1944), S. 883-888

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Keywords: Chemistry ; Organic Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

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URL: http://dx.doi.org/10.1002/hlca.194402701113

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39

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Über die säureamidartige Selbstkondensation der 1, 3, 5-Amino-sulfo-benzoesäure. (3. Mitteilung über Sulfo-carbonsäuren) (1944)

Ruggli, Paul ; Dahn, Hans

New York, NY : Wiley-Blackwell

Helvetica Chimica Acta 27 (1944), S. 867-882

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Keywords: Chemistry ; Organic Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

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URL: http://dx.doi.org/10.1002/hlca.194402701112

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Contribution à l'étude des dérivés nitro-aminés de l'acide o-bromo-benzoïque (1944)

Goldstein, Henri ; Preitner, Gaston

New York, NY : Wiley-Blackwell

Helvetica Chimica Acta 27 (1944), S. 888-891

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Keywords: Chemistry ; Organic Chemistry

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URL: http://dx.doi.org/10.1002/hlca.194402701114

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41

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Über Konstitution und toxische Wirkung von natürlichen und neuen synthetischen insektentötenden Stoffen (1944)

Läuger, P. ; Martin, H. ; Müller, P.

New York, NY : Wiley-Blackwell

Helvetica Chimica Acta 27 (1944), S. 892-928

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Keywords: Chemistry ; Organic Chemistry

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Additional Material: 12 Ill.

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URL: http://dx.doi.org/10.1002/hlca.194402701115

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42

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Zur Kenntnis des Abbaues der Aminosäuren im tierischen Organismus. II. Über die Spezifität der „l-Aminosäure-oxydase“ (1944)

Edlbacher, S. ; Grauer, H.

New York, NY : Wiley-Blackwell

Helvetica Chimica Acta 27 (1944), S. 928-942

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ISSN: 0018-019X

Keywords: Chemistry ; Organic Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

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Notes: 1. Der Einfluss verschiedener Inhibitoren auf die oxydative Desaminierung von l-Phenylalanin und l-Glutaminsäure durch Meerschweinchennierenschnitte wurde geprüft.

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43

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Strukturchemische Untersuchungen XI. Zur Kenntnis des reaktiven Verhaltens von Di-thio-amiden gegenüber Tribrom-triacetyl-benzol (1944)

Bischoff, G. ; Weber, O. ; Erlenmeyer, H.

New York, NY : Wiley-Blackwell

Helvetica Chimica Acta 27 (1944), S. 947-948

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URL: http://dx.doi.org/10.1002/hlca.194402701118

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Études sur les matières végétales volatiles XXX. Applications de la formylation sélective du bornéol, de l'octanol-(3) et de l'alcool benzylique, en présence de linalol et de ses esters, è l'analyse des huiles essentielles (1944)

Naves, Y. R.

New York, NY : Wiley-Blackwell

Helvetica Chimica Acta 27 (1944), S. 942-947

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Keywords: Chemistry ; Organic Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Notes: La méthode de formylation sélective, déjà développée par Simmons, peut être utilisée avec profit pour évaluer le bornéol, l'octanol-(3) et leurs esters, en présence de linalol et d'acétate de linalyle. Par contre, l'usage du mode opératoire élémentaire ne convient pas à l'analyse de mélanges renfermant de l'alcool benzylique ou de l'acétate de benzyle, en raison de la solubilité du formiate de benzyle dam les liquides de lavage.

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45

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Über Bestandteile der Nebennierenrinde und verwandte Stoffe (69. Mitteilung). Einwirkung von Bleitetra-acetat auf Cholestenon (1944)

Seebeek, E. ; Reichstein, T.

New York, NY : Wiley-Blackwell

Helvetica Chimica Acta 27 (1944), S. 948-950

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Keywords: Chemistry ; Organic Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

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URL: http://dx.doi.org/10.1002/hlca.194402701119

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46

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Quantitative Bestimmung des Gesamtlipoidgehaltes von Naturstoffen (1944)

Reichert, Rolf

New York, NY : Wiley-Blackwell

Helvetica Chimica Acta 27 (1944), S. 961-965

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Keywords: Chemistry ; Organic Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

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URL: http://dx.doi.org/10.1002/hlca.194402701121

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47

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Étude des réactions secondaires de l'ozonolyse d'une liaison éthylénique (1944)

Stoll, M. ; Rouvé, A.

New York, NY : Wiley-Blackwell

Helvetica Chimica Acta 27 (1944), S. 950-961

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Keywords: Chemistry ; Organic Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Notes: Nous avons identifié l'acétate de lauryle parmi les produits de l'ozonolyse de l'acétate de brassidyle et d'érucyle.

Additional Material: 2 Tab.

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URL: http://dx.doi.org/10.1002/hlca.194402701120

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48

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Über Gallensäuren und verwandte Stoffe. 30. Mitteilung. Vereinfachte Methode zur Bereitung von 3α, 12α-Dioxy-ätiocholansäure (1944)

Wenner, V. ; Reichstein, T.

New York, NY : Wiley-Blackwell

Helvetica Chimica Acta 27 (1944), S. 965-969

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URL: http://dx.doi.org/10.1002/hlca.194402701122

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49

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Strukturchemische Untersuchungen XII. Über Thiazolderivate aus dem Dithio-amid der Benzol-1, 4-dicarbonsäure (1944)

Erlenmeyer, H. ; Büchler, W. ; Lehr, H.

New York, NY : Wiley-Blackwell

Helvetica Chimica Acta 27 (1944), S. 969-970

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Keywords: Chemistry ; Organic Chemistry

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URL: http://dx.doi.org/10.1002/hlca.194402701123

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50

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Strukturchemische Untersuchungen XIII. Zur Kenntnis des Malonsäure-dithio-amids (1944)

Lehr, H. ; Guex, W. ; Erlenmeyer, H.

New York, NY : Wiley-Blackwell

Helvetica Chimica Acta 27 (1944), S. 970-972

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Keywords: Chemistry ; Organic Chemistry

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URL: http://dx.doi.org/10.1002/hlca.194402701124

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51

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Zur Kenntnis der Triterpene. (88. Mitteilung). Über Friedelin und Cerin (1944)

Ruzicka, L. ; Jeger, O. ; Ringnes, P.

New York, NY : Wiley-Blackwell

Helvetica Chimica Acta 27 (1944), S. 972-988

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Source: Wiley InterScience Backfile Collection 1832-2000

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Additional Material: 2 Ill.

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URL: http://dx.doi.org/10.1002/hlca.194402701125

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Über Steroide und Sexualhormone. (99. Mitteilung). Synthese des 12-Epi-14-desoxy-digoxigenins (1944)

Ruzicka, L. ; Plattner, Pl. A. ; Pataki, J.

New York, NY : Wiley-Blackwell

Helvetica Chimica Acta 27 (1944), S. 988-994

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Keywords: Chemistry ; Organic Chemistry

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URL: http://dx.doi.org/10.1002/hlca.194402701126

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53

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Influence de la température sur la chaleur de formation des mélanges. Système tétrachlorure de carbone-benzène (1944)

Boissonnas, Ch. G. ; Cruchaud, Max

New York, NY : Wiley-Blackwell

Helvetica Chimica Acta 27 (1944), S. 994-1006

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ISSN: 0018-019X

Keywords: Chemistry ; Organic Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Notes: Nous avons mesuré, par calorimétrie, les chaleurs de dilution des mélanges de benzène et de tétrachlorure de carbone à 10°, 20°, 30° et 40°, et en avons déduit les chaleurs de formation de ces mélanges.

Additional Material: 5 Ill.

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54

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Über optisch aktive Tocole und Abbauprodukte des Phytols und Phytadiens (1944)

Karrer, P. ; Kugler, A. ; Simon, H.

New York, NY : Wiley-Blackwell

Helvetica Chimica Acta 27 (1944), S. 1006-1009

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Keywords: Chemistry ; Organic Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

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URL: http://dx.doi.org/10.1002/hlca.194402701128

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Zur Kenntnis der Sesquiterpene. (64. Mitteilung). Über die Anlagerung von Acetylen-dicarbonsäure-ester, Azodicarbon-säure-ester und Maleinsäure-anhydrid an Caryophyllen (1944)

Plattner, Pl. A. ; Werner, L.

New York, NY : Wiley-Blackwell

Helvetica Chimica Acta 27 (1944), S. 1010-1016

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Source: Wiley InterScience Backfile Collection 1832-2000

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Additional Material: 2 Tab.

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URL: http://dx.doi.org/10.1002/hlca.194402701129

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Errata (1944)

New York, NY : Wiley-Blackwell

Helvetica Chimica Acta 27 (1944), S. 1016-1016

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Keywords: Chemistry ; Organic Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

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URL: http://dx.doi.org/10.1002/hlca.194402701130

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57

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Über eine Eichsubstanz für spektrographische Absorptionsmessungen (1944)

v. Halban, H. ; Wieland, K.

New York, NY : Wiley-Blackwell

Helvetica Chimica Acta 27 (1944), S. 1032-1038

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Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Additional Material: 1 Tab.

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URL: http://dx.doi.org/10.1002/hlca.194402701132

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58

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La biotine, l'aneurine et le méso-inositol, facteurs de croissance pour Eremothecium Ashbyii Guillermond. La biosynthèse de la riboflavine (1944)

Schopfer, W. H.

New York, NY : Wiley-Blackwell

Helvetica Chimica Acta 27 (1944), S. 1017-1032

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Keywords: Chemistry ; Organic Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

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Additional Material: 1 Ill.

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59

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A propos de la microanalyse des silicates. Analyse d'une porcelaine de Chine du 18° siècle (1944)

Wenger, Paul-E. ; Besso, Z.

New York, NY : Wiley-Blackwell

Helvetica Chimica Acta 27 (1944), S. 1038-1044

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Keywords: Chemistry ; Organic Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Additional Material: 2 Ill.

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URL: http://dx.doi.org/10.1002/hlca.194402701133

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60

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Bestimmung von Keto-Enol-Gleichgewichten in Wasser (1944)

Schwarzenbach, G. ; Felder, E.

New York, NY : Wiley-Blackwell

Helvetica Chimica Acta 27 (1944), S. 1044-1060

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Keywords: Chemistry ; Organic Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

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URL: http://dx.doi.org/10.1002/hlca.194402701134

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61

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Zur Kenntnis des Abbaues der Aminosäuren im tierischen Organismus. 3. Über den oxydativen Abbau der Aminosäuren im Gehirn (1944)

Edlbacher, S. ; Wiss, O.

New York, NY : Wiley-Blackwell

Helvetica Chimica Acta 27 (1944), S. 1060-1073

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Keywords: Chemistry ; Organic Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Notes: 1) Das von Abderhalden und Tetzner beschriebene Schock-Phänomen nach Verabreichung von d-Alanin wird bestätigt.

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A propos de l'électrodialyse (1944)

Dhéré, Charles

New York, NY : Wiley-Blackwell

Helvetica Chimica Acta 27 (1944), S. 1079-1080

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Keywords: Chemistry ; Organic Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

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URL: http://dx.doi.org/10.1002/hlca.194402701137

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63

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Polarographische Natriumbestimmung in Aluminium und Aluminiumlegierungen (1944)

Urech, P. ; Sulzberger, R.

New York, NY : Wiley-Blackwell

Helvetica Chimica Acta 27 (1944), S. 1074-1079

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Keywords: Chemistry ; Organic Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Notes: Die zur Natriumbestimmung in Aluminium und Aluminiumlegierungen vorgeschlagenen Bestimmungsmethoden werden diskutiert und die polarographische Bestimmung nach Heyrovsky auf Roh- und Umschmelzmetallproben angewandt. Dabei zeigte es sich, dass dieselbe bei den üblichen Natriumgehalten von Roh- und Umschmelzaluminium nicht anwendbar ist. Die nötigen Natriumkonzentrationen werden durch ein Anreicherungsverfahren erreicht und nach Aufstellung einer Eichkurve Resultate erzielt, welche mit spektralanalytischen Werten befriedigend übereinstimmen. Die untere Bestimmungsgrenze der Methode liegt bei ca. 0,001%. Trotz relativ grosser Unterschiede in Einzelresultaten, ist die Übereinstimmung zweier völlig verschiedener Untersuchungsmethoden bei den in Frage stehenden Gehalten bemerkenswert. Über die Grössenordnung des in Aluminium enthaltenen Natriums dürfte somit heute kein Zweifel mehr bestehen.

Additional Material: 2 Ill.

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URL: http://dx.doi.org/10.1002/hlca.194402701136

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Untersuchungen über optisch aktive Diphenylverbindungen I. (Problemstellung und experimentelle Ergebnisse) (1944)

Kuhn, W. ; Rometsch, R.

New York, NY : Wiley-Blackwell

Helvetica Chimica Acta 27 (1944), S. 1080-1102

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ISSN: 0018-019X

Keywords: Chemistry ; Organic Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Notes: Modellmässige Betrachtungen über das Zustandekommen der optischen Aktivität führen zu bestimmten Vermutungen über das Schwingungsbild, welches bei asymmetrischen Diphenylverbindungen, die aus 2 identischen, gegeneinander gedrehten Molekelhälften bestehen, zu erwarten ist.

Additional Material: 16 Ill.

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URL: http://dx.doi.org/10.1002/hlca.194402701138

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Über m-Phenylen-di-glykol. (53. Mitteilung über Stickstoff-Heterocyclen) (1944)

Ruggli, Paul ; Knecht, Karl

New York, NY : Wiley-Blackwell

Helvetica Chimica Acta 27 (1944), S. 1108-1115

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Keywords: Chemistry ; Organic Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

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URL: http://dx.doi.org/10.1002/hlca.194402701140

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66

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Etudes sur les matières végétales volatiles XXXI. Sur l'isolement des huiles essentielles dissoutes dans les eaux de distillation (1944)

Naves, Y. R.

New York, NY : Wiley-Blackwell

Helvetica Chimica Acta 27 (1944), S. 1103-1108

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Keywords: Chemistry ; Organic Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Notes: L'isolement de l'essence des distillats aqueux d'extraits végétaux libérant des constituants solubles dans l'eau (alcool benzylique, alcool phényléthylique, etc.) doit être effectué après salaison, dans des conditions précises. Il est recommandé de ne pas traiter par le pentane les produits qui renferment l'alcool benzylique, mais d'utiliser le mélange de pentane et d'éther. La technique de codistillation d'essences avec le glycol décrite par ailleurs doit être amendée.

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URL: http://dx.doi.org/10.1002/hlca.194402701139

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67

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Zur Charakterisierung der 1,3,5-Amino-sulfo-benzoesäure und ähnlicher Amino-sulfo-carbonsäuren. (4. Mitteilung über Sulfo-carbonsäuren) (1944)

Ruggli, Paul ; Dahn, Hans

New York, NY : Wiley-Blackwell

Helvetica Chimica Acta 27 (1944), S. 1116-1122

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Keywords: Chemistry ; Organic Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

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URL: http://dx.doi.org/10.1002/hlca.194402701141

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68

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Über den Einfluss des hydrostatischen Druckes auf die Sedimentationsgeschwindigkeit in der Ultrazentrifuge (1944)

Mosimann, H. ; Signer, R.

New York, NY : Wiley-Blackwell

Helvetica Chimica Acta 27 (1944), S. 1123-1127

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Keywords: Chemistry ; Organic Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

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Additional Material: 1 Ill.

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URL: http://dx.doi.org/10.1002/hlca.194402701142

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69

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Über die Spaltung der Tröger'schen Base in optische Antipoden, ein Beitrag zur Stereochemie des dreiwertigen Stickstoffs (1944)

Prelog, V. ; Wieland, P.

New York, NY : Wiley-Blackwell

Helvetica Chimica Acta 27 (1944), S. 1127-1134

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Keywords: Chemistry ; Organic Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

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Additional Material: 2 Ill.

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URL: http://dx.doi.org/10.1002/hlca.194402701143

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70

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Die Identifizierung der vermeintlichen l-Idose von Ohle und v. Vargha als 3, 6-Anhydro-d-glucose (1944)

Seebeck, E. ; Meyer, A. ; Reichstein, T.

New York, NY : Wiley-Blackwell

Helvetica Chimica Acta 27 (1944), S. 1142-1145

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Keywords: Chemistry ; Organic Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

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URL: http://dx.doi.org/10.1002/hlca.194402701145

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71

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Fettstoffwechsel-Untersuchungen mit Deuterium als Indikator. IV. Fettbildung aus Eiweiss bei Albino-Ratten (1944)

Bernhard, Karl ; Steinhauser, Heidi ; Matthey, A.

New York, NY : Wiley-Blackwell

Helvetica Chimica Acta 27 (1944), S. 1134-1141

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Keywords: Chemistry ; Organic Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

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Notes: Unter Benützung des schweren Wasserstoff-Isotopen als Indikator wurde bei ausgewachsenen Ratten unter verschiedenen Bedingungen die Fettbildung aus Eiweiss untersucht, indem der Deuterium-Gehalt der aus Leber, Darm und restlichem Kadaver isolierten Fettsäuren die sichere Feststellung und Beurteilung eintretender Fett-Neubildungen erlaubt. Diese waren nach Fleischnahrung als Eiweissquelle nur von geringen Umfang, es scheint, dass der Lipoidgehalt dieses Futters eine hinreichende Fettversorgung gewährleistet und der Organismus auf eigene Fettbildungen verzichtet.

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72

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Krystallisierte 2-Desoxy-l-rhamnose (2-Desoxy-l-chinovose). Desoxyzucker. 2. Mitteilung (1944)

Iselin, B. ; Reichstein, T.

New York, NY : Wiley-Blackwell

Helvetica Chimica Acta 27 (1944), S. 1146-1149

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Keywords: Chemistry ; Organic Chemistry

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URL: http://dx.doi.org/10.1002/hlca.194402701146

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73

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Steroide und Sexualhormone. (100. Mitteilung). Über die Epimerisierung der beiden 7-Oxy-cholesterin-diacetate am Kohlenstoffatom 7 (1944)

Ruzicka, L. ; Prelog, V. ; Tagmann, E.

New York, NY : Wiley-Blackwell

Helvetica Chimica Acta 27 (1944), S. 1149-1153

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Additional Material: 1 Tab.

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URL: http://dx.doi.org/10.1002/hlca.194402701147

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74

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Die Wirkung von Oestron auf die Zitze des weiblichen Meerschweinchens (1944)

Jadassohn, W. ; Fierz, H. E. ; Pfanner, E.

New York, NY : Wiley-Blackwell

Helvetica Chimica Acta 27 (1944), S. 1161-1163

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Additional Material: 1 Tab.

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URL: http://dx.doi.org/10.1002/hlca.194402701149

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75

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Über Steroide. (36. Mitteilung). Zur Darstellung von Saccharidderivaten der Steroide (1944)

Meystre, Ch. ; Miescher, K.

New York, NY : Wiley-Blackwell

Helvetica Chimica Acta 27 (1944), S. 1153-1160

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URL: http://dx.doi.org/10.1002/hlca.194402701148

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76

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Über Steroide und Sexualhormone. (101 Mitteilung). Über die Δ5,16-3 β-Oxy-ätiocholadiensäure und einige ihrer Umwandlungsprodukte (1944)

Ruzicka, L. ; Hardegger, E. ; Kauter, C.

New York, NY : Wiley-Blackwell

Helvetica Chimica Acta 27 (1944), S. 1164-1173

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Keywords: Chemistry ; Organic Chemistry

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URL: http://dx.doi.org/10.1002/hlca.194402701150

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77

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Über Steroide und Sexualhormone. (102. Mitteilung). Über Homologe der digitaloiden Aglucone mit einer Methyl-Gruppe in α-Stellung des Lacton-Ringes (1944)

Ruzicka, L. ; Plattner, Pl. A. ; Heusser, H.

New York, NY : Wiley-Blackwell

Helvetica Chimica Acta 27 (1944), S. 1173-1176

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URL: http://dx.doi.org/10.1002/hlca.194402701151

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78

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Zur Kenntnis der Triterpene. (89. Mitteilung). Abbau des Hederagenins zur C26-Stufe (1944)

Ruzicka, L. ; Jeger, O. ; Norymberski, J.

New York, NY : Wiley-Blackwell

Helvetica Chimica Acta 27 (1944), S. 1185-1196

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Additional Material: 2 Tab.

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URL: http://dx.doi.org/10.1002/hlca.194402701153

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79

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Notiz über keimungshemmende Stoffe (1944)

Schmid, H.

New York, NY : Wiley-Blackwell

Helvetica Chimica Acta 27 (1944), S. 1197-1199

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Keywords: Chemistry ; Organic Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

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URL: http://dx.doi.org/10.1002/hlca.194402701154

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80

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2-Desoxy-l-fucose. Desoxyzucker. 3. Mitteilung (1944)

Iselin, B. ; Reichstein, T.

New York, NY : Wiley-Blackwell

Helvetica Chimica Acta 27 (1944), S. 1200-1203

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Keywords: Chemistry ; Organic Chemistry

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URL: http://dx.doi.org/10.1002/hlca.194402701155

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81

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Über Steroide und Sexualhormone. (103. Mitteilung). Über den sterischen Verlauf der Hydrierung von Doppelbindungen in 17, 20-Stellung der Steroide (1944)

Plattner, Pl. A. ; Bucher, H. ; Hardegger, E.

New York, NY : Wiley-Blackwell

Helvetica Chimica Acta 27 (1944), S. 1177-1184

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Keywords: Chemistry ; Organic Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

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URL: http://dx.doi.org/10.1002/hlca.194402701152

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82

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Synthese der d-Digitoxose. Desoxyzucker. 4. Mitteilung (1944)

Iselin, B. ; Reichstein, T.

New York, NY : Wiley-Blackwell

Helvetica Chimica Acta 27 (1944), S. 1203-1209

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URL: http://dx.doi.org/10.1002/hlca.194402701156

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83

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Bei der Redaktion eingelaufene Bücher: (Die Redaktion verpflichtet sich nicht zur Besprechung der eingesandten Werke.) (1944)

New York, NY : Wiley-Blackwell

Helvetica Chimica Acta 27 (1944), S. 1224-1224

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URL: http://dx.doi.org/10.1002/hlca.194402701158

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84

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Die Schweizerische Chemische Gesellschaft in den Jahren 1901-1941. Im Auftrage des Vorstandes verfasst (1944)

Rupe, H.

New York, NY : Wiley-Blackwell

Helvetica Chimica Acta 27 (1944), S. 1225-1252

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Keywords: Chemistry ; Organic Chemistry

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URL: http://dx.doi.org/10.1002/hlca.194402701159

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85

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Über Alkyl-(β-oxy-β-aryl-äthyl)-sulfide und Dialkyl-(β-oxy-β-aryl-äthyl)-sulfonium-salze (1944)

Prelog, V. ; Hahn, V. ; Brauchli, H. ; [et al.]

New York, NY : Wiley-Blackwell

Helvetica Chimica Acta 27 (1944), S. 1209-1224

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86

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Über die Photochemie des Tetrabenzoyl-äthylens III (1944)

Keller, H. ; v. Halban, H.

New York, NY : Wiley-Blackwell

Helvetica Chimica Acta 27 (1944), S. 1253-1275

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Additional Material: 7 Ill.

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URL: http://dx.doi.org/10.1002/hlca.194402701160

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87

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Über Thiophanverbindungen VI. Reduktionsprodukte von Thiophanon-3-derivaten (1944)

Karrer, P. ; Schmid, H.

New York, NY : Wiley-Blackwell

Helvetica Chimica Acta 27 (1944), S. 1275-1280

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Keywords: Chemistry ; Organic Chemistry

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88

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Über Thiophanverbindungen VII. N-Acetylamino-thiophanon-3-carbonsäure-2-äthylester (1944)

Karrer, P. ; Schmid, H.

New York, NY : Wiley-Blackwell

Helvetica Chimica Acta 27 (1944), S. 1280-1284

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89

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Über Thiophanverbindungen VIII. Einige Derivate des Thiophanons-3 (1944)

Karrer, P. ; Kieso, A.

New York, NY : Wiley-Blackwell

Helvetica Chimica Acta 27 (1944), S. 1285-1287

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URL: http://dx.doi.org/10.1002/hlca.194402701163

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90

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Über Bestandteile der Nebennierenrinde und verwandte Stoffe. 70. Mitteilung. Teilsynthese des Corticosterons (1944)

von Euw, J. ; Lardon, A. ; Reichstein, T.

New York, NY : Wiley-Blackwell

Helvetica Chimica Acta 27 (1944), S. 1287-1296

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Additional Material: 1 Ill.

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URL: http://dx.doi.org/10.1002/hlca.194402701164

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91

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Ein Tocol mit bicyclischer Seitenkette (1944)

Karrer, P. ; Rentschler, H.

New York, NY : Wiley-Blackwell

Helvetica Chimica Acta 27 (1944), S. 1297-1300

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Keywords: Chemistry ; Organic Chemistry

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URL: http://dx.doi.org/10.1002/hlca.194402701165

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92

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Lycopersen, ein isoprenhomologer Kohlenwasserstoff des Squalens mit 40 C-Atomen (1944)

Karrer, P. ; Kramer, Hans

New York, NY : Wiley-Blackwell

Helvetica Chimica Acta 27 (1944), S. 1301-1302

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93

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Emil Baur 1873-1944 (1944)

Treadwell, W. D.

New York, NY : Wiley-Blackwell

Helvetica Chimica Acta 27 (1944), S. 1302-1313

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94

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Über Flotationsversuche mit 8-Oxychinolin als Sammler. VI (1944)

Theilheimer, W. ; Erlenmeyer, H.

New York, NY : Wiley-Blackwell

Helvetica Chimica Acta 27 (1944), S. 1313-1315

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95

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Über Flotationsversuche mit 8-Oxychinolin als Sammler. VII. Die fraktionierte Flotation als Methode zur Charakterisierung fester Stoffe (1944)

Erlenmeyer, H. ; Thelheimer, W.

New York, NY : Wiley-Blackwell

Helvetica Chimica Acta 27 (1944), S. 1315-1319

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96

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Über Flotationsversuche mit Flusspat (1944)

Theilheimer, W. ; Erlenmeyer, H.

New York, NY : Wiley-Blackwell

Helvetica Chimica Acta 27 (1944), S. 1319-1321

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URL: http://dx.doi.org/10.1002/hlca.194402701170

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Cinétique de la réaction entre la chlorhydrine de l'éthyléne et l'hydroxyde de sodium et de la réaction inverse (1944)

Porret, D.

New York, NY : Wiley-Blackwell

Helvetica Chimica Acta 27 (1944), S. 1321-1328

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ISSN: 0018-019X

Keywords: Chemistry ; Organic Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Notes: La réction entre la chlorhydrine de l'éthylène et l'hydroxyde de sodium est légèrement reversible. Le même état d'équilibre peut être atteint, dans les deux sens et il est soumis à, la loi d'action de masse.

Additional Material: 3 Ill.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/hlca.194402701171

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Beitrag zur Kenntnis der Aluminiumchlorid-Äther-Komplexverbindungen (1944)

Urech, P. ; Sulzberger, R.

New York, NY : Wiley-Blackwell

Helvetica Chimica Acta 27 (1944), S. 1328-1331

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ISSN: 0018-019X

Keywords: Chemistry ; Organic Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Notes: 1. Die beim Lösen von Aluminium in Äther-Salzsäure sich bildende ölige Flüssigkeit wurde näher untersucht und beschrieben.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/hlca.194402701172

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Synthese des 2-Desoxy-d-chinovose-3-methyläthers (d-Oleandrose). Desoxyzucker. 5. Mitteilung (1944)

Vischer, E. ; Reichstein, T.

New York, NY : Wiley-Blackwell

Helvetica Chimica Acta 27 (1944), S. 1332-1345

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ISSN: 0018-019X

Keywords: Chemistry ; Organic Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/hlca.194402701173

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Untersuchungen über optisch aktive Diphenylverbindungen II. (Deutung von Rotationsdispersion und Zirkulardichroismus; Vergleich mit theoretischen Ansätzen) (1944)

Kuhn, Werner ; Rometsch, R.

New York, NY : Wiley-Blackwell

Helvetica Chimica Acta 27 (1944), S. 1346-1371

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ISSN: 0018-019X

Keywords: Chemistry ; Organic Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Notes: Anhand der in Teil I mitgeteilten Messungen der Rotations-dispersion und des Zirkulardichroismus von in konz. Schwefelsaure wird festgestellt, dass die bei 2700 Å gelegene Absorptionsbande dieser Verbindung, den theoretischen Erwartungen entsprechend, in 2 etwa gleich starke, entgegengesetzt dichroitische Halbbanden zerfällt entsprechend ist der Drehungsverlauf symmetrisch zur Gesamt-Absorptionsbande (Gegensatz zu dem antisymmetrischen Verlauf der Rotationsdispersion bei „normalen“, homogenen Absorptionsbanden bei Verbindungen mit asymmetrischen C-Atomen). Die Aufspaltung δ (Frequenzdifferenz der beiden Halbbanden) wird zu ungefähr δ = 3 × 1012 sec-1 ≌ 8 Å bestimmt.

Additional Material: 6 Ill.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/hlca.194402701174

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