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  • 1
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    American Association for the Advancement of Science (AAAS)
    In: Science
    Publication Date: 2016-07-08
    Description: After many years of delays, the €1.7 billion Facility for Antiproton and Ion Research, an extension of the GSI Helmholtz Center for Heavy Ion Research near Darmstadt, Germany, may finally get built. At a council meeting on 27 and 28 June, the partner countries—eight European Union members plus India and Russia—concluded that they have enough money to cover a €320 million budget gap; they will now seek building permits from the German government. Still, some countries have yet to commit their share of the missing cash, including Russia, which had agreed to bear about 18% of FAIR's total construction cost, the second largest contribution after Germany's 70%. Author: Edwin Cartlidge
    Keywords: Physics
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  • 2
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    American Association for the Advancement of Science (AAAS)
    In: Science
    Publication Date: 2016-07-08
    Description: Author: Phil Szuromi
    Keywords: Organic Chemistry
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  • 3
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    American Association for the Advancement of Science (AAAS)
    In: Science
    Publication Date: 2016-07-08
    Description: Author: Jake Yeston
    Keywords: Organic Chemistry
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  • 4
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    American Association for the Advancement of Science (AAAS)
    In: Science
    Publication Date: 2016-05-27
    Description: Author: Jake Yeston
    Keywords: Organic Chemistry
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  • 5
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    American Association for the Advancement of Science (AAAS)
    In: Science
    Publication Date: 2016-05-27
    Description: Author: Jelena Stajic
    Keywords: Physics
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  • 6
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    American Association for the Advancement of Science (AAAS)
    In: Science
    Publication Date: 2016-07-15
    Description: Author: Jake Yeston
    Keywords: Organic Chemistry
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  • 7
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    American Association for the Advancement of Science (AAAS)
    In: Science
    Publication Date: 2016-07-15
    Description: Author: Jelena Stajic
    Keywords: Physics
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  • 8
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    American Association for the Advancement of Science (AAAS)
    In: Science
    Publication Date: 2016-07-22
    Description: Author: Ian S. Osborne
    Keywords: Physics
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  • 9
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    American Association for the Advancement of Science (AAAS)
    In: Science
    Publication Date: 2016-07-22
    Description: Author: Jake Yeston
    Keywords: Organic Chemistry
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  • 10
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    American Association for the Advancement of Science (AAAS)
    In: Science
    Publication Date: 2016-04-08
    Description: Author: Jelena Stajic
    Keywords: Physics
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  • 11
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    American Association for the Advancement of Science (AAAS)
    In: Science
    Publication Date: 2016-03-25
    Description: Density functional theory (DFT) stands out from all first-principles quantum mechanical methods for the simulation of materials, as it enables very good approximations for the complicated components of electronic motion called exchange and correlation. DFT is the method of choice for many materials simulations because of the availability of general-purpose programs that can perform calculations on any material. Results obtained with one DFT program need to be reproducible by any of the other DFT programs, and this has not been straightforward up to now. On page 10.1126/science.aad3000 of this issue, Lejaeghere et al. (1) describe an extensive effort by developers of the major solid-state DFT codes to provide a unified and reproducible benchmark of precision for their calculations based on a reliable criterion, the so-called Δ gauge. Using the Δ gauge, the authors found that the level of precision that can be achieved today in DFT calculations of elemental crystalline solids is comparable to the precision of the most advanced techniques for experimental measurement of the properties of materials. The work leads to the conclusion that the DFT simulation of elemental crystalline solids is a (computationally) solved problem, but also poses the question of whether we can achieve the same levels of validation and reproducibility for more complex simulations of materials involving several elements and/or several methods. Author: Chris-Kriton Skylaris
    Keywords: Physics
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  • 12
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    American Association for the Advancement of Science (AAAS)
    In: Science
    Publication Date: 2016-07-01
    Description: The photoemission of electrons from atoms, molecules, and condensed matter provides the experimental basis of our understanding of electronic structure. During the process of photoemission, a sufficiently large quantum of electromagnetic radiation (a photon) is absorbed by matter and converted into an electronic excitation, promoting a bound electron into a final state above the vacuum energy Evac. In photoemission spectroscopy, the kinetic energy and momentum of electrons in such final states are analyzed after their propagation to a distant detector. To determine the electronic structure of the sample, the “sudden approximation” has to be fulfilled, whereby the photoelectron leaves the sample fast enough, without further interaction with the remaining electronic structure. On page 62 of this issue, Tao et al. (1) provide unprecedented insight into final-state dynamics by measuring the time a photoelectron takes to leave a solid material for characteristically different final states. By comparing an electron excited to a final state of a nickel solid Ψ Nif with one excited to a state of vacuum Ψ vacf, they establish that a photoelectron resides in the final state for 200 attoseconds (as) (2 × 10−16 s) before it leaves the nickel (see the figure). Such time scales would still allow for the electron to interact with its surroundings and, thus, are relevant for the validity of the sudden approximation. Authors: Uwe Bovensiepen, Manuel Ligges
    Keywords: Physics
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  • 13
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    American Association for the Advancement of Science (AAAS)
    In: Science
    Publication Date: 2016-06-24
    Description: Author: Jake Yeston
    Keywords: Organic Chemistry
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  • 14
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    American Association for the Advancement of Science (AAAS)
    In: Science
    Publication Date: 2016-06-24
    Description: Author: Jelena Stajic
    Keywords: Physics
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  • 15
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    American Association for the Advancement of Science (AAAS)
    In: Science
    Publication Date: 2016-07-01
    Description: Author: Jake Yeston
    Keywords: Organic Chemistry
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  • 16
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    American Association for the Advancement of Science (AAAS)
    In: Science
    Publication Date: 2016-08-16
    Description: When a multibillion-dollar physics experiment is canceled, it's tempting to look for lessons that can be applied to future megascience projects. A new book on the rise and fall of the Superconducting Supercollider (SSC) by a trio of science historians takes on that challenge. And while the authors do an excellent job of describing what occurred in the decade from its inception to its demise, they stumble when trying to assign blame. Author: Jeffrey Mervis
    Keywords: Physics
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  • 17
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    American Association for the Advancement of Science (AAAS)
    In: Science
    Publication Date: 2016-06-10
    Description: Transition metal–catalyzed arylation of C–H bonds has been intensively studied for forming C–C bonds in complex-molecule synthesis (1). An acidic C–H bond (for example, one near a double bond or an O atom) is cleaved to form a carbon–metal bond, which then couples to arene. Many of these organometallic species can be generated catalytically. Much less research has dealt with unreactive nonacidic sp3 C–H bond functionalization (3). On page 1304 of this issue, Shaw et al. (3) report an efficient and general method that focuses on arylation of sp3 C–H bonds at carbon atoms adjacent to amines and to cyclic ethers by combining nickel, visible-light photoredox, and hydrogen-atom transfer (HAT) catalysis. Author: Corinne Fruit
    Keywords: Organic Chemistry
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  • 18
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    American Association for the Advancement of Science (AAAS)
    In: Science
    Publication Date: 2016-06-10
    Description: Author: Jake Yeston
    Keywords: Organic Chemistry
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  • 19
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    American Association for the Advancement of Science (AAAS)
    In: Science
    Publication Date: 2016-09-09
    Description: Author: Jake Yeston
    Keywords: Organic Chemistry
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  • 20
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    American Association for the Advancement of Science (AAAS)
    In: Science
    Publication Date: 2016-09-07
    Description: Author: Jake Yeston
    Keywords: Organic Chemistry
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  • 21
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    American Association for the Advancement of Science (AAAS)
    In: Science
    Publication Date: 2016-05-20
    Description: Antibiotics have been taking it on the chin lately. Not only has resistance to the anti-infective medications been growing, but drug companies have been dropping antibiotic research programs, because the drugs are difficult and expensive to make. Now, new help is on the way. Researchers report this week that they've found a way to churn out new members of one of the most widely used classes of antibiotics. These drugs, called macrolides, were first developed in the 1950s and now represent a major bulwark against infections. A bevy of possible new drugs in this class could lead to new weapons against antibiotic-resistant infections, and possibly save millions of lives. Author: Robert F. Service
    Keywords: Organic Chemistry
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  • 22
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    American Association for the Advancement of Science (AAAS)
    In: Science
    Publication Date: 2016-05-20
    Description: Standard superconductors consist of a condensate of paired electrons, called Cooper pairs. The transport behavior of these pairs at junctions can produce exotic effects that are of fundamental and practical interest. When two superconductors are in contact via a normal metal, the pairs must convert to single-particle states to traverse between superconductors. This occurs by the Andreev process, whereby a low-energy electron in the normal metal injects a Cooper pair into the superconductor and generates a hole that reflects back into the metal; coherent, opposite-momentum electron-hole pairs then carry the supercurrent across the metallic junction (1) (see the figure, panel A). In the case of superconductors connected to a quantum Hall state, there are only one-way paths along the junction edges. Here, a new type of Andreev process is predicted to occur, whereby electron and hole states on opposite sample edges carry the supercurrent. This prediction was made more than 20 years ago (2), but clear observation of the effect was frustrated by the difficulty of creating coexisting superconducting and quantum Hall states. On page 966 of this issue, Amet et al. (3) report on the interplay between these two states, finding evidence for the unconventional Andreev process. Their results confirm new physics that appears when two correlated states are connected, and opens the door to a range of novel excitations and exotic devices. Author: Nadya Mason
    Keywords: Physics
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  • 23
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    American Association for the Advancement of Science (AAAS)
    In: Science
    Publication Date: 2016-04-22
    Description: Author: Jake Yeston
    Keywords: Organic Chemistry
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  • 24
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    American Association for the Advancement of Science (AAAS)
    In: Science
    Publication Date: 2016-04-29
    Description: Author: Jake Yeston
    Keywords: Organic Chemistry
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  • 25
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    American Association for the Advancement of Science (AAAS)
    In: Science
    Publication Date: 2016-05-13
    Description: Author: Jake Yeston
    Keywords: Organic Chemistry
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  • 26
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    American Association for the Advancement of Science (AAAS)
    In: Science
    Publication Date: 2016-03-11
    Description: Grappling with our desire to understand nature, we construct models of the specific systems that we wish to study. Unsurprisingly, such models are generally highly tailored to the system of interest. But are all these models really that distinct? Or, could there be a universal model that can somehow describe the behavior of any system we could think of? On page 1180 of this issue, De las Cuevas and Cubitt (1) venture out to weave ideas from physics and computer science in an attempt to answer this question for all classical spin models. Author: Stephanie Wehner
    Keywords: Physics
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  • 27
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    American Association for the Advancement of Science (AAAS)
    In: Science
    Publication Date: 2016-03-18
    Description: The recent report of superconductivity in hydrogen sulfide (H2S) by Drozdov et al. (1) at a record high superconducting critical temperature Tc of 203 K and at high pressure (153 GPa) triggered excitement from both a fundamental and technological perspective. On page 1303 of this issue, Troyan et al. (2) confirm the finding by using an elegant and unexpected implementation of the Mössbauer technique at the third-generation synchrotron facility in Grenoble, France. They measured the Meissner effect (3)—the expulsion of magnetic field from the sample—thereby unequivocally confirming the existence of superconductivity. The new superconductor is believed to have a simple chemical formula, H3S. The superconductivity in H3S was predicted theoretically by Duan et al. (4) before the first experimental findings were reported. The technique has great potential for future studies of tiny samples squeezed to extremely high pressure. This experimental advance paves the road to probing superconductivity in metallic hydrogen, which is expected to be a room-temperature superconductor above 500 GPa (5). Author: Viktor Struzhkin
    Keywords: Physics
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  • 28
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    American Association for the Advancement of Science (AAAS)
    In: Science
    Publication Date: 2016-03-04
    Description: Turn a switch and the light goes on. The layman's perception is that this is like opening a tap so that the water starts running. But this analogy is misleading. The flow of water is governed by the theory of hydrodynamics, whereby the behavior of the fluid does not require knowledge of the motions of individual molecules. Electrical currents in solids, however, are formed from electrons. In metals, these do not collide with each other, but they do scatter from lattice imperfections. The resulting “Knudsen flow” of electrons is reminiscent of the avalanche of balls cascading through a dense forest of pins, as in a Pachinko machine. On pages 1058, 1055, and 1061 of this issue, evidence is presented that electrons can actually yield to the laws of hydrodynamics (1–3). What is additionally surprising is that these observations are in agreement with mathematical techniques borrowed from string theory (4). These techniques have been applied to describe strongly interacting forms of quantum matter, predicting that they should exhibit hydrodynamic flows (5). Author: Jan Zaanen
    Keywords: Physics
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  • 29
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    American Association for the Advancement of Science (AAAS)
    In: Science
    Publication Date: 2016-05-20
    Description: The 20th-century philosopher Wilfrid Sellars characterized the aim of philosophy as "to understand how things in the broadest possible sense of the term hang together in the broadest possible sense of the term." This is also physicist Sean Carroll's aim in his new book, The Big Picture. He sets out to show how various phenomena, including thought, choice, conscioussness, and value, hang together with the scientific account of reality that has been developed in physics in the past 100 years. He attempts to do all this without relying on specialized jargon from philosophy and physics, and succeeds spectacularly in achieving both aims. Author: Barry Loewer
    Keywords: Physics
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  • 30
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    American Association for the Advancement of Science (AAAS)
    In: Science
    Publication Date: 2016-04-22
    Description: An inherent aspect of any two-dimensional (2D) sheet is that all atoms in the material lie on the surface. This leads to a concept of 2D crystals as a “canvas,” where different chemical groups or “ink” on the surface can lead to a palette of distinct materials properties. The most well-studied 2D crystal is graphene, a one-atom-thick sheet of carbon atoms arranged in a honeycomb lattice. Although graphene's superlative materials properties and novel physical phenomena have led to a variety of applications (1), better tunability of these properties is still required. Toward this end, hydrogenated graphene (graphane) was predicted to have a wide band gap and exhibit magnetic order (2–4), in contrast to graphene, which is (semi)metallic and diamagnetic. The chemical stability of graphene makes hydrogenation difficult to control, and this has hampered efforts to tune its electronic or magnetic properties. On page 437 of this issue, González-Herrero et al. (5) report direct evidence that hydrogen atoms on graphene do indeed yield a magnetic moment and that these moments can order ferromagnetically over relatively large distances. If these methods can be extended to industrial scales, then one can imagine storing information at unprecedented densities by painting magnetic bits on graphene canvases (see the figure). Authors: S. M. Hollen, J. A. Gupta
    Keywords: Physics
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  • 31
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    American Association for the Advancement of Science (AAAS)
    In: Science
    Publication Date: 2016-04-01
    Description: The SN2 nucleophilic substitution reaction, X− + RY → XR + Y−, is a paradigm reaction in organic chemistry (1). The modern understanding of the SN2 reaction mechanism is based on work of Hughes and Ingold (2), who proposed that the nucleophile (X−) approaches the carbon atom that bears the leaving group (Y−). As a result, the bond between the carbon atom and the leaving group becomes weakened. As this bond breaks and a new bond forms between the nucleophile and the carbon atom, the configuration of the carbon atom is inverted. Analyses of gas-phase reaction rates led to the suggestion of a potential energy surface (PES) with two wells connected by a central barrier transition state (3). Electronic structure calculations have confirmed this picture for some SN2 reactions (4), but recent studies have shown that the actual reaction dynamics may be considerably more complex (see the figure) (5–8). Authors: Jing Xie, William L. Hase
    Keywords: Organic Chemistry
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  • 32
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    American Association for the Advancement of Science (AAAS)
    In: Science
    Publication Date: 2016-04-01
    Description: Author: Julia Fahrenkamp-Uppenbrink
    Keywords: Organic Chemistry
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    American Association for the Advancement of Science (AAAS)
    In: Science
    Publication Date: 2016-04-15
    Description: Storing information in an ensemble of single-atom magnets represents the ultimate miniaturization of data storage technology, in which two specific orientations of each atomic magnetic moment represent a bit (a 0 or 1) of information (see the figure, panel A). The inherent dilemma in using a single-atom magnet is keeping it magnetized—or, in other words, being able to hold the information in one of the bit states without an external magnetic field for a useful amount of time and at practical temperatures (1, 2). This phenomenon of magnetic remanence is dif cult to realize from a single atom, in part because diminished robustness against fluctuations from the environment can unintentionally flip the magnetic state, thus wiping out the magnetic memory. A recent attempt to observe remanence in a single atom (3) proved premature, as the results were incompatible with the magnetic ground state of that system (4) and could not be reproduced (4, 5). Hence, the question of whether this defining property of a single-atom magnet can actually be achieved has remained an open question until now. On page 318 of this issue, Donati et al. (6) demonstrate that single holmium atoms exhibit magnetic remanence up to temperatures of 40 K, much higher than previous records of atomic-scale magnets composed of 3 to 12 atoms (1, 2, 5)—a record in both size and stability for any magnet. Authors: Alexander Ako Khajetoorians, Andreas J. Heinrich
    Keywords: Physics
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    American Association for the Advancement of Science (AAAS)
    In: Science
    Publication Date: 2016-11-18
    Description: Author: Jake Yeston
    Keywords: Organic Chemistry
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    American Association for the Advancement of Science (AAAS)
    In: Science
    Publication Date: 2016-11-18
    Description: Author: Jake Yeston
    Keywords: Organic Chemistry
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    American Association for the Advancement of Science (AAAS)
    In: Science
    Publication Date: 2016-09-30
    Description: Next week, the 2016 Nobel Prize in Physics will be announced, and many scientists expect it to honor the detection of ripples in space called gravitational waves, reported in February by scientists working with the Laser Interferometer Gravitational-Wave Observatory (LIGO). If other prizes are a guide, the Nobel will go to the troika of physicists who 32 years ago conceived of LIGO: Rainer Weiss of the Massachusetts Institute of Technology in Cambridge, and Ronald Drever and Kip Thorne of the California Institute of Technology (Caltech) in Pasadena. But some influential physicists, including previous Nobel laureates, say the prize, which can be split three ways at most, should include somebody else: Barry Barish, a particle physicist at Caltech. Barish didn't invent LIGO, but he made it happen. The hardware at LIGO's two observatories in Hanford, Washington, and Livingston, Louisiana; the structure of the collaboration; even the big-science character of gravitational wave research—all were molded by Barish, who is now 80. Without Barish, some physicists say, there would have been no discovery. Author: Adrian Cho
    Keywords: Physics
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Geosciences , Computer Science , Medicine , Natural Sciences in General , Physics
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    American Association for the Advancement of Science (AAAS)
    In: Science
    Publication Date: 2016-11-04
    Description: Spectroscopy is the most accurate branch of science. Optical transition frequencies in isolated atoms and molecules can nowadays be measured to many-digit accuracies by applying the tools developed in the atomic physics community: ultrastable lasers, locked via frequency-comb lasers to atomic clocks, and the techniques to cool and control the motion of atoms. Precision measurements on small quantum systems can be compared with theoretical descriptions of these systems at the most fundamental level, allowing physics theories to be tested and enabling the search for physics beyond the standard model (1). On page 610 of this issue, Hori et al. (2) apply these tricks of the trade to a small atomic quantum system with a built-in antiparticle to perform precise spectroscopic measurement in antiprotonic helium (see the figure). The technique of buffer-gas cooling is demonstrated for the first time on a composite matter–antimatter particle. Author: Wim Ubachs
    Keywords: Physics
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Geosciences , Computer Science , Medicine , Natural Sciences in General , Physics
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    Nature Publishing Group (NPG)
    Publication Date: 2016-02-13
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Powell, Kendall -- England -- Nature. 2016 Feb 11;530(7589):148-51. doi: 10.1038/530148a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/26863966" target="_blank"〉PubMed〈/a〉
    Keywords: Biological Science Disciplines ; Internet/utilization ; Journal Impact Factor ; Open Access Publishing ; Peer Review, Research/*trends ; *Periodicals as Topic ; Physics ; Publishing/*trends ; Time Factors
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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    American Association for the Advancement of Science (AAAS)
    In: Science
    Publication Date: 2016-08-13
    Description: Author: Jelena Stajic
    Keywords: Physics
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Geosciences , Computer Science , Medicine , Natural Sciences in General , Physics
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    American Association for the Advancement of Science (AAAS)
    In: Science
    Publication Date: 2016-12-09
    Description: Author: Jake Yeston
    Keywords: Organic Chemistry
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Geosciences , Computer Science , Medicine , Natural Sciences in General , Physics
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    American Association for the Advancement of Science (AAAS)
    In: Science
    Publication Date: 2016-10-21
    Description: Author: Jake Yeston
    Keywords: Organic Chemistry
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Geosciences , Computer Science , Medicine , Natural Sciences in General , Physics
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    American Association for the Advancement of Science (AAAS)
    In: Science
    Publication Date: 2016-11-04
    Description: Author: Jelena Stajic
    Keywords: Physics
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Geosciences , Computer Science , Medicine , Natural Sciences in General , Physics
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    American Association for the Advancement of Science (AAAS)
    In: Science
    Publication Date: 2016-10-08
    Description: Inspired by the intriguing topological phenomena recently observed in condensed-matter systems (1), a variety of different research areas, from optical to mechanical systems, have devoted their studies to topological physics. Owing to their high level of experimental controllability, cold atomic gases offer a promising platform to simulate condensed-matter models. Their charge neutrality, however, is an apparent limitation. To overcome these constraints, new experimental techniques are currently being developed that mimic the physics of charged particles. On page 83 of this issue, Wu et al. (2) report on such a new experimental technique to simulate two-dimensional (2D) spin-orbit coupling (SOC) for neutral atoms in an optical lattice—an important ingredient to explore topological quantum states. Author: Monika Aidelsburger
    Keywords: Physics
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Geosciences , Computer Science , Medicine , Natural Sciences in General , Physics
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    American Association for the Advancement of Science (AAAS)
    In: Science
    Publication Date: 2016-10-08
    Description: Mathematical physicist Roger Penrose stands out as an independent thinker, who for years has been critical of a few current trends in theoretical physics and cosmology. You don't have to agree with all, or even a part, of Penrose's criticism to realize that Fashion, Faith, and Fantasy in the New Physics of the Universe represents an extremely original, rich, and thoughtful survey of today's most fashionable attempts to decipher the cosmos on its smallest and largest scales, writes reviewer Mario Livio. Author: Mario Livio
    Keywords: Physics
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Geosciences , Computer Science , Medicine , Natural Sciences in General , Physics
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    American Association for the Advancement of Science (AAAS)
    In: Science
    Publication Date: 2016-09-30
    Description: Is time discrete or continuous? What is the smallest measurement of time that we can make? And does time actually pass faster as we age, or is it just our perception? You may consider such questions to be metaphysical or philosophical, but in Now: The Physics of Time Richard Muller ponders these and other questions through the lens of a number of major 20th century physics discoveries. In doing so, Muller successfully introduces and describes most, if not all, of the key elements in an undergraduate physics course, masterfully connecting them with the conceptual thread of "the arrow of time." Author: Lisa Jardine-Wright
    Keywords: Physics
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Geosciences , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 46
    Keywords: Environment ; Climate change ; Remote sensing ; Physics ; Environment ; Climate Change ; Remote Sensing/Photogrammetry ; Energy Efficiency ; Climate Change/Climate Change Impacts ; Applied and Technical Physics
    Description / Table of Contents: Part I The Urban Heat Island – Evidence, Measures and Tools --- Forecasting Models for Urban Warming in Climate Change --- Assessment Indication and Gold Standard --- Methodologies for UHI Analysis --- Decision Support Systems for Urban Planning --- Part II Pilot Actions in European Cities --- Counteracting Urban Heat Islands: Solutions for European Cities.
    Pages: Online-Ressource (LIII, 400 pages) , 213 illustrations
    ISBN: 9783319104256
    Language: English
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  • 47
    Keywords: Physics ; Mathematical physics ; Quantum physics ; Physics ; Quantum Physics ; Mathematical Applications in the Physical Sciences ; History and Philosophical Foundations of Physics
    Description / Table of Contents: I The Cellular Automaton Interpretation as a general doctrine: Motivation for this work --- Deterministic models in quantum notation --- Interpreting quantum mechanics --- Deterministic quantum mechanics --- Concise description of the CA Interpretation --- Quantum gravity --- Information loss --- More problems --- Alleys to be further investigated and open questions --- Conclusions --- II Calculation Techniques: Introduction to part II --- More on cogwheels --- The continuum limit of cogwheels, harmonic rotators and oscillators --- Locality --- Fermions --- PQ theory --- Models in two space-time dimensions without interactions --- Symmetries --- The discretised Hamiltonian formalism in PQ theory --- Quantum Field Theory --- The cellular automaton --- The problem of quantum locality --- Conclusions of part II --- Some remarks on gravity in 2+1 dimensions --- A summary of our views on Conformal Gravity --- Abbreviations.
    Pages: Online-Ressource (XVIII, 298 pages) , 21 illustrations, 19 illustrations in color
    ISBN: 9783319412856
    Language: English
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  • 48
    Keywords: Physics ; History ; Nuclear physics ; Heavy ions ; Hadrons ; Particle acceleration ; Physics ; Nuclear Physics, Heavy Ions, Hadrons ; History and Philosophical Foundations of Physics ; Particle Acceleration and Detection, Beam Physics ; History of Science
    Description / Table of Contents: Part I Reminiscences: Rolf Hagedorn and Relativistic Heavy Ion Research.-- Part II The Hagedorn Temperature --- Part III Melting Hadrons, Boiling Quarks Heavy Ion Path to Quark-Gluon Plasma --- Acronyms
    Pages: Online-Ressource (XVI, 441 pages)
    ISBN: 9783319175454
    Language: English
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    Keywords: Environment ; Climate change ; Remote sensing ; Physics ; Environment ; Climate Change ; Remote Sensing/Photogrammetry ; Energy Efficiency ; Climate Change/Climate Change Impacts ; Applied and Technical Physics
    Description / Table of Contents: Part I The Urban Heat Island – Evidence, Measures and Tools --- Forecasting Models for Urban Warming in Climate Change --- Assessment Indication and Gold Standard --- Methodologies for UHI Analysis --- Decision Support Systems for Urban Planning --- Part II Pilot Actions in European Cities --- Counteracting Urban Heat Islands: Solutions for European Cities.
    Pages: Online-Ressource (LIII, 400 pages) , 213 illustrations
    ISBN: 9783319104256
    Language: English
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    Berlin, Heidelberg : Springer
    Keywords: Mathematics ; Computer graphics ; Dynamics ; Ergodic theory ; Functions of complex variables ; Differential geometry ; Physics ; Mathematics ; Differential Geometry ; Functions of a Complex Variable ; Dynamical Systems and Ergodic Theory ; Computer Graphics ; Numerical and Computational Physics
    Description / Table of Contents: Discrete conformal maps: Boundary value problems, circle domains, Fuchsian and Schottky uniformization: Alexander I. Bobenko, Stefan Sechelmann, Boris Springborn --- Discrete complex analysis on planar quad-graphs: Alexander I. Bobenko and Felix Günther --- Approximation of conformal mappings using conformally equivalent triangular lattices: Ulrike Bücking --- Numerical Methods for the Discrete Map Za: Folkmar Bornemann, Alexander Its, Sheehan Olver, and Georg Wechslberger --- A variational principle for cyclic polygons with prescribed edge lengths: Hana Kourimská, Lara Skuppin, Boris Springborn --- Complex Line Bundles over Simplicial Complexes and their Applications: Felix Knöppel and Ulrich Pinkall --- Holomorphic vector fields and quadratic differentials on planar triangular meshes: Wai Yeung Lam, Ulrich Pinkall --- Vertex normals and face curvatures of triangle meshes: Xiang Sun, Caigui Jiang, Johannes Wallner, and Helmut Pottmann --- S-conical cmc surfaces. Towards a unified theory of discrete surfaces with constant mean curvature: Alexander I. Bobenko and Tim Hoffmann --- Constructing solutions to the Björling problem for isothermic surfaces by structure preserving discretization: Ulrike Bücking and Daniel Matthes --- On the Lagrangian Structure of Integrable Hierarchies: Yuri B. Suris, Mats Vermeeren --- On the variational interpretation of the discrete KP equation: Raphael Boll, Matteo Petrera, and Yuri B. Suris --- Six topics on inscribable polytopes: Arnau Padrol and Günter M. Ziegler --- DGD Gallery: Storage, sharing, and publication of digital research data: Michael Joswig, Milan Mehner, Stefan Sechelmann, Jan Techter, and Alexander I. Bobenko
    Pages: Online-Ressource (X, 439 pages) , 114 illustrations, 67 illustrations in color
    ISBN: 9783662504475
    Language: English
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    Unknown
    Berlin, Heidelberg : Springer
    Keywords: Mathematics ; Computer graphics ; Dynamics ; Ergodic theory ; Functions of complex variables ; Differential geometry ; Physics ; Mathematics ; Differential Geometry ; Functions of a Complex Variable ; Dynamical Systems and Ergodic Theory ; Computer Graphics ; Numerical and Computational Physics
    Description / Table of Contents: Discrete conformal maps: Boundary value problems, circle domains, Fuchsian and Schottky uniformization: Alexander I. Bobenko, Stefan Sechelmann, Boris Springborn --- Discrete complex analysis on planar quad-graphs: Alexander I. Bobenko and Felix Günther --- Approximation of conformal mappings using conformally equivalent triangular lattices: Ulrike Bücking --- Numerical Methods for the Discrete Map Za: Folkmar Bornemann, Alexander Its, Sheehan Olver, and Georg Wechslberger --- A variational principle for cyclic polygons with prescribed edge lengths: Hana Kourimská, Lara Skuppin, Boris Springborn --- Complex Line Bundles over Simplicial Complexes and their Applications: Felix Knöppel and Ulrich Pinkall --- Holomorphic vector fields and quadratic differentials on planar triangular meshes: Wai Yeung Lam, Ulrich Pinkall --- Vertex normals and face curvatures of triangle meshes: Xiang Sun, Caigui Jiang, Johannes Wallner, and Helmut Pottmann --- S-conical cmc surfaces. Towards a unified theory of discrete surfaces with constant mean curvature: Alexander I. Bobenko and Tim Hoffmann --- Constructing solutions to the Björling problem for isothermic surfaces by structure preserving discretization: Ulrike Bücking and Daniel Matthes --- On the Lagrangian Structure of Integrable Hierarchies: Yuri B. Suris, Mats Vermeeren --- On the variational interpretation of the discrete KP equation: Raphael Boll, Matteo Petrera, and Yuri B. Suris --- Six topics on inscribable polytopes: Arnau Padrol and Günter M. Ziegler --- DGD Gallery: Storage, sharing, and publication of digital research data: Michael Joswig, Milan Mehner, Stefan Sechelmann, Jan Techter, and Alexander I. Bobenko
    Pages: Online-Ressource (X, 439 pages) , 114 illustrations, 67 illustrations in color
    ISBN: 9783662504475
    Language: English
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  • 52
    Keywords: Physics ; History ; Nuclear physics ; Heavy ions ; Hadrons ; Particle acceleration ; Physics ; Nuclear Physics, Heavy Ions, Hadrons ; History and Philosophical Foundations of Physics ; Particle Acceleration and Detection, Beam Physics ; History of Science
    Description / Table of Contents: Part I Reminiscences: Rolf Hagedorn and Relativistic Heavy Ion Research.-- Part II The Hagedorn Temperature --- Part III Melting Hadrons, Boiling Quarks Heavy Ion Path to Quark-Gluon Plasma --- Acronyms
    Pages: Online-Ressource (XVI, 441 pages)
    ISBN: 9783319175454
    Language: English
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  • 53
    Keywords: Physics ; Mathematical physics ; Quantum physics ; Physics ; Quantum Physics ; Mathematical Applications in the Physical Sciences ; History and Philosophical Foundations of Physics
    Description / Table of Contents: I The Cellular Automaton Interpretation as a general doctrine: Motivation for this work --- Deterministic models in quantum notation --- Interpreting quantum mechanics --- Deterministic quantum mechanics --- Concise description of the CA Interpretation --- Quantum gravity --- Information loss --- More problems --- Alleys to be further investigated and open questions --- Conclusions --- II Calculation Techniques: Introduction to part II --- More on cogwheels --- The continuum limit of cogwheels, harmonic rotators and oscillators --- Locality --- Fermions --- PQ theory --- Models in two space-time dimensions without interactions --- Symmetries --- The discretised Hamiltonian formalism in PQ theory --- Quantum Field Theory --- The cellular automaton --- The problem of quantum locality --- Conclusions of part II --- Some remarks on gravity in 2+1 dimensions --- A summary of our views on Conformal Gravity --- Abbreviations.
    Pages: Online-Ressource (XVIII, 298 pages) , 21 illustrations, 19 illustrations in color
    ISBN: 9783319412856
    Language: English
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  • 54
    Keywords: Physics ; Quantum optics ; Physics ; Optics, Lasers, Photonics, Optical Devices ; Quantum Optics ; Popular Science in Physics ; History and Philosophical Foundations of Physics
    Description / Table of Contents: History --- A brief history of light --- Ibn Al-Haitham – Father of modern optics --- Optical Sources --- Femtosecond light --- Laser --- LED light --- Electron optics --- Applications --- Biophotonics --- Optical communication --- Optical astronomy --- Solar cells --- Optics in Remote Sensing --- Optics in nanotechnology --- Optics in art --- Eye --- Optics in medicine --- Optical illusions --- Quantum Optics --- Optical tests of foundations of physics --- Nonlinear Optics: Historical Perspectives and New Opportunities --- Quantum communication --- Nature of photon --- Atom optics --- Coherent effects: From EIT to slow light
    Pages: Online-Ressource (XX, 504 pages) , 355 illustrations, 277 illustrations in color
    ISBN: 9783319319032
    Language: English
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    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 32 (1949), S. 8-17 
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Es werden gewisse Ähnlichkeiten zwischen Wolle und Bakterien festgestellt.
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    Helvetica Chimica Acta 32 (1949), S. 35-38 
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 2-Amino-5-n-propylthiazol und 2-Amino-4-n-butylthiazol wurden synthetisiert und auf ihre biologische Wirkung untersucht.
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    Helvetica Chimica Acta 32 (1949), S. 50-55 
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: In Staubbeuteln von Lilium candidum wurde als Hauptpigment ein cis-Antheraxanthin gefunden, das gut krystallisiert, durch chlorwasserstoffhaltiges Chloroform in Mutatoxanthin und durch Jod und Belichtung teilweise in trans-Antheraxanthin übergeführt wird. Erst das erste in der Natur gefundene Carotinoid-epoxyd mit cis-Konfiguration.
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    Electronic Resource
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    Helvetica Chimica Acta 32 (1949), S. 77-86 
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Durch Einwirkung von N-Bromsuccinimid auf Crotonaldehyd-diacetat entstand das γ-Bromcrotonaldehyd-diacetat. Diese Substanz liess sich in DL-Erythrit, in die stereoisomeren 2,3,4-Tribrom-butanaldiacetate, in Octadien-(2,6)-dial (1,8)-tetraacetat und in das Disemicarbazon- und Di-p-nitrophenylhydrazon des Fumardial-dehyds überführen.
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    Helvetica Chimica Acta 32 (1949), S. 115-133 
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 1. Es wird die Isolierung eines dijodtyrosinhaltigen und eines thyroxinhaltigen Polypeptids aus dem Schilddrüseneiweiss auf fermentativem Wege beschrieben.
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    Helvetica Chimica Acta 32 (1949), S. 149-153 
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 1. Es wird eine Methode beschrieben, die es ermöglicht, den Oxyprolingehalt in kleinen Mengen Blut und Harn zu bestimmen.
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    Helvetica Chimica Acta 32 (1949), S. 153-163 
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 1. Es wurde bei der Ratte die Beeinflussung von 9 entbehrlichen Aminosäuren des Blutes durch verschiedene Ernährung geprüft.
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    Helvetica Chimica Acta 32 (1949), S. 191-197 
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Es wird die Synthese des Δ5 β-Oxy-ätio-cholensäure-azids und dessen Kupplung mit Pferde- und Kaninchenserum beschrieben. Ein entsprechendes Δ5-3-Chlor-ätio-cholensäure-derivat konnte nicht in reiner Form isoliert werden. Allgemein aber erwies sich die Azidmethode als zur Herstellung von steroidkonjugierten Proteinen gut geeignet.
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    Helvetica Chimica Acta 32 (1949), S. 235-238 
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Es wird ein einfacher, sicherer und empfindlicher Mikronachweis von organisch gebundenem Schwefel beschrieben. Etwa 0,5 mg Substanz werden in einer Kapillare durch Erhitzen mit Kaliumcarbonat-Magnesium-Gemisch reduziert und der Schwefelwasserstoff durch Bleiacetat nachgewiesen.
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    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Pour nos essais, nous nous sommes servis d'une cellule d'électrolyse agencée de façon à permettre l'agitation de l'électrolyte, la mesure du volume d'hydrogéne dégagé, de la température et la détermination du potentiel cathodique.
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    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Vereinfachte, von Cholestenon ausgehende Synthesen von 3β, 5-Dioxy-koprostan (VIII) und 3α, 5-Dioxy-koprostan (VII) werden beschrieben.
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    Helvetica Chimica Acta 32 (1949), S. 293-315 
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Coronilla glauca enthält ein kompliziertes Gemisch von Herzglykosiden, die sich aus verschiedenen Geninen und Glucose aufbauen. Bei der Einwirkung eines spezifischen Samenenzyms wird die Zucker-Aglykon-Bindung gelöst. Es ist unseres Wissens damit zum ersten Male ein spezifisches herzglykosidspaltendes Enzym, das sein Substrat bis zum Aglykon abbaut, bekannt geworden.
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    Helvetica Chimica Acta 32 (1949), S. 489-505 
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Einige reine Ester und Äther des Vitamins A wurden nach dem von uns früher beschriebenen Aufbauprinzip dargestellt. Die Schmelzpunkte der synthetischen Krystallisate stimmen mit den bekannten Schmelzpunkten der entsprechenden Vitamin-A-Präparate aus Leberölen überein. Die Wirksamkeit der Ester (Standard-β-Carotin) berechnet auf 1 g Vitamin-A-Alkohol betrug 3,3±0,6 Millionen i. E. Der Methyläther besitzt annähernd die gleiche und der Butyläther deutlich geringere Wirksamkeit. Der Phenyläther vom Smp. 90-91° ist wenig wirksam. Die molare Extinktion bei 325-328 mm̈ aller Präparate betrug ca. 50 000 und die molare Extinktion der Carr-Price-Messung gab ebenfalls gleiche Werte. Die molare Exaltation des Systems der konjugierten Doppelbindungen wurde übereinstimmend mit 16,5±0,6 bestimmt. Die Messung der Sauerstoffempfindlichkeit im Warburg-Apparat zeigt, dass die Ester beständiger sind als der Methyläther und der Vitamin-A-Alkohol. Die alkalische Hydrolyse der Ester verläuft erwartungsgemäss als Reaktion 2. Ordnung.
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    Helvetica Chimica Acta 32 (1949), S. 544-552 
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Durch Reduktion der Cyclanon-isoxime mit Lithiumaluminiumhydrid in Äther bzw. Tetrahydro-furan wurden die Polymethylenimine mit 7- bis 21-gliedrigem Ring hergestellt.
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    Helvetica Chimica Acta 32 (1949), S. 506-521 
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Die Aufhebung des Asymmetriezentrums am Kohlenstoffatom 8 durch β-Aminocarbonsäure-Spaltung ergibt ein identisches Lactam aus Lysergsäure und Isolysergsäure, was zur Formulierung dieser Isomeren als Diastereomere führt. Ihre hydrierbare Doppelbindung wird auf Grund des Vergleichs der Absorptionsspektren in Δ9-10 festgelegt. Der Hofmann'sche Abbau, die Decarboxylierung und die Hydrierung von Lysergsäure und Isolysergsäure werden in Übereinstimmung mit dieser Auffassung formuliert. Für den Mechanismus der reversiblen Lysergsäure-Isolysergsäure-Umlagerung wird eine Erklärung gegeben.
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    Helvetica Chimica Acta 32 (1949), S. 717-722 
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Eine Verminderung von Gerinnungsfaktor V (Owren) kann bei Verwendung der Einphasenmethode nach Quick eine Reduktion des Prothrombins vortäuschen. Die erwähnte Bestimmungsmethode muss daher durch Zusatz von prothrombinfreiem, aber Faktor V-haltigem Plasma ergänzt werden. Die Angabe der Prothrombinkonzentration in Prozenten der Norm bedarf ebenfalls einer Revision unter Berücksichtigung der Wirkung von Faktor V. Die kritische Prothrombinkonzentration z. B., unterhalb welcher Spontanblutungen zu erwarten sind, liegt nicht, wie bisher angenommen, bei 20, sondern bei 5% Prothrombin.
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    Helvetica Chimica Acta 32 (1949), S. 761-769 
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Erhitzen von Androstan-3, β, 17α-diol mit wasserfreier Ameisensäure führte zum krystallisierten, beständigen 3β-Formyloxy-ψ-androsten. Durch seine Ozonisation und weitere Umwandlung bis zum Chrysen konnte gezeigt werden, dass die Doppelbindung im ψ-Androsten sich zwischen den Kohlenstoffatomen 13 und 17 befindet.
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    Helvetica Chimica Acta 32 (1949), S. 757-761 
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    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Le glucosane de Zea maïs, variété «Golden bantam», a été étudié au point de vue constitution, poids moléculaire et dégradation β-amylatique. Il ne se distingue pas du glycogène animal.
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    Helvetica Chimica Acta 32 (1949), S. 692-702 
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 1. Nach einem kurzen Überblick über die bisher angestellten Untersuchungen über die Landolt-Reaktion wird gezeigt, dass sich drei Typen dieses Vorganges unterscheiden lassen. Diese Aufteilung ergibt sich durch das Geschwindigkeitsverhältnis der drei simultanen Teilreaktionen (1) und (2) und (3). Der Umschlag erfolgt: bei Typ I, wenn das Reduktionsmittel total verbraucht ist (Totalreduktion); bei Typ II, wenn die Geschwindigkeit der Reaktionen (2) und (3) einander gleich werden (partielle Reduktion); bei Typ III, wenn [J'] die Empfindlichkeitsgrenze der Jodstärke-Reaktion erreicht, während Jod schon teilweise ausgeschieden ist (Jod-Vorlauf).
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    Helvetica Chimica Acta 32 (1949), S. 723-734 
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Es wurde die Folgetitration von 10-3-m. KJ+10-3-m. KBr+10-3-m. KCl mit 10-1-m. AgNO3 unter Verwendung einer genau arbeitenden automatischen Potentialregistrierung durchgeführt. Um hierbei den Einfluss des zeitlichen Verlaufes möglichst ungestört beobachten zu können, wurde das Silbernitrat mit Hilfe einer automatischen Vorrichtung kontinuierlich zugeführt.
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    Helvetica Chimica Acta 32 (1949), S. 744-756 
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 1. Wir haben die Synthese des Citrullins aus Ornithin durch die Mitochondrienfraktion der Leber (Ratte) bei Gegenwart von Glutamin untersucht. Bei Glutaminkonzentrationen von 20-30 μ Mol/cm3 ist das Amid mit oder ohne Zusatz von Ammoniumsalzen der Glutaminsäure plus Ammoniumsalz stark überlegen. Bei kleinen Konzentrationen, unter 3 μ Mol/cm3 liefert aber die Glutaminsäure unter allen Umständen mehr Citrullin als das Glutamin. Es ist also wenig wahrscheinlich, dass das Glutamin eine direkte Zwischenstufe der Synthese ist. Die Wirksamkeit des Amids lässt sich andererseits aber nicht einfach durch die Hydrolyse der Säureamidgruppe erklären. Dieselbe scheint eine spezifische Funktion zu haben. Das Glutamin steht offenbar zu einem Zwischenglied der Citrullinsynthese in enger Beziehung.
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    Helvetica Chimica Acta 32 (1949), S. 810-812 
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Zusammenfassend ergibt unsere Untersuchung über im Kindesalter gebildete Harnsteine: 1Im Gegensatz zu den später entstehenden Harnkonkrementen, welche weit bevorzugt Harnsäuresteine darstellen, fehlen Harnsäurebildungen unter den im Kindesalter auftretenden Harnsteinen.2Weit vorherrschend sind vielmehr Struvitsteine wobei diese im Nierenbecken und in den Harnleitern multipel auftreten. In einem Fall hatte sich - offenbar zur Ausnahme ein solitärer Struvitstein in der Harnblase um einen Fremdkörper (Nadel) gebildet. Struvitkonkremente finden sich häufig bei alkalischem Urim mit Cysto-Pyelitis, Oxalat- und Harnsäuresteine dagegen zumeist bei saurem Urin. Struvitsteine können leicht rezidivieren.3Alle Nichtstruvitsteine, nämlich solche aus Csytin, Calciumoxalat-Monohydrat und -Dihydrat, waren Solitärsteine, ersterer in der Harnblase, letztere dagegen im Nierenbecken.
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    Helvetica Chimica Acta 32 (1949), S. 839-853 
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 1. Die 4 Carboxylatgruppen des Anions Y-4 der Äthylendiamin-tetraessigsäure liegen in den Komplexionen [MY]z-4 im allgemeinen nicht alle im Zentralatom, so dass dieses noch eine Koordinationslücke aufweist, die einen Fremdliganden aufnehmen kann. Eine dieser Reaktionen, diejenige zwischen CoY-2 und CNS-, wurde mit Hilfe von Extinktionsmessungen untersucht, und es wurde gezeigt, wie man zur Kenntnis der Gleichgewichtskonstanten derartiger Reaktionen gelangen kann.
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    Helvetica Chimica Acta 32 (1949), S. 877-880 
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Nous avons effectué la synthèse de l'acide ptéroylsulfoglutamique, produit semblable à l'acide folique, dans lequel le noyau benzoylé est remplacé par un noyau benzosulfoné. Cette synthèse a été effectuée avec la réductone comme produit intermédiaire.
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    Helvetica Chimica Acta 32 (1949), S. 913-924 
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Durch Berücksichtigung aller genannten Regeln erhält man neben den Tabellen I bis III der einfachen Krystallklassen für Oh und Ih die bereits bekannten eindeutigen Charakterendarstellungen der Haupttabellen IV und V. Aus ihnen ergeben sich wiederum die Charakterendarstellungen der Untergruppen O, Th, Td, T bzw. I durch Kolonnenauswahl und Vereinigung der Zeilen mit gleichen zurückbleibenden Charakteren zu einem Typus. Damit ist in fünf Haupttabellen das gesamte Grundmaterial zur Gewinnung der symmetriebedingten Auswahlregeln zusammengefasst. Die nächste Aufgabe ist die der Berechnung der Freiheitsgrade, die in einer dritten Mitteilung erfolgt.
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    Helvetica Chimica Acta 32 (1949), S. 957-960 
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    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Aus den oberirdischen Organen des Sumpfschachtelhalms (Equisetum palustre) wurden Dimethylsulfon und Thymin isoliert. Für Dimethylsulfon ist dies das erste im Pflanzenreich festgestellte Vorkommen.
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    Helvetica Chimica Acta 32 (1949), S. 979-984 
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    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Es werden Vereinfachungen in der Isolierungsmethode der Desoxyribonucleoside aus den Produkten der fermentativen Hydrolyse von Thymonucleinsäure mit Kälberdarm-Nucleotidase beschrieben. Die physikalischen Konstanten der isolierten Nucleoside waren z. T. von den in der Literatur beschriebenen verschieden.
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    Helvetica Chimica Acta 32 (1949), S. 1046-1052 
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Es werden die Lösungsspektren von Anilin-diessigsäure, Anthranilsäure-diessigsäure, ihrer verschiedenen Ionisationsstufen sowie ihrer Erdalkali- und Zink-Komplexe angegeben. Die Spektren erlauben eine eindeutige Aussage über die Struktur der Säuren und ihrer Ionisationsstufen in wässriger Lösung. Bei der Anilin-diessigsäure liegt die Aminosäureform und bei der Anthranilsäure-diessigsäure die Betainform vor.
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    Helvetica Chimica Acta 32 (1949), S. 1070-1074 
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    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Die α-Oxyde IIa und XIIIa des Allo-cholesterin-acetats und des Epi-allo-cholesterin-acetats werden beschrieben und der Beweis für die Konstitutionen dieser beiden Verbindungen erbracht. Die saure katalytische Hydrierung von Allo-cholesterin-β-oxyd (V) führte zu 3β, 4β-Dioxy-cholestan (VI), während die Reduktion desselben Oxyds V mit Lithiumaluminiumhydrid 3β,5-Dioxy-koprostan (III) liefert.
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    Helvetica Chimica Acta 32 (1949), S. 1102-1107 
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    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Les différents facteurs influençant l'oxydation des oligosaccharides et polysaccharides par le periodate ont été étudiés. Il faut maintenir au cours de l'oxydation une température de 0° et un pH compris entre 4,2 et 5,8, pour éviter soit la saponification des esters formiques provenant des groupes réducteurs, soit la scission hydrolytique de polysaccharides oxydés.
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    Helvetica Chimica Acta 32 (1949), S. 1137-1143 
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    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
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    Helvetica Chimica Acta 32 (1949), S. 1151-1155 
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: L'expérience a montré que, seules jusqu'à présent les techniques d'ozonolyse comportant la réduction de l'ozonide préparé en milieu sec conduisent, pour quelques produits possédant le groupement 〉 C = CH2 générateur d'aldéhyde formique, à des résultats analytiques à peu près satisfaisants. La technique de Doeuvre appartient à cette catégorie. Elle présente divers défauts opératoires et le présent travail a conduit à une micro-méthode exempte de plusieurs de ces défauts. Dans les conditions élaborées, les déterminations de la néo-γ-irone, de plusieurs de ses dérivés, et de l'acide dextro-pimarique, sont satisfaisantes.
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    Helvetica Chimica Acta 32 (1949), S. 1163-1163 
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    Keywords: Chemistry ; Organic Chemistry
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    Topics: Chemistry and Pharmacology
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    Helvetica Chimica Acta 32 (1949), S. 1166-1175 
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    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Das Patulin besitzt nicht die allgemein angenommene Struktur eines Oxymethylen-tetrahydrocomansäure-Lactons I, sein Skelett muss vielmehr demjenigen der Tetrahydro-γ-pyronyl-(3)-essigsäure (VIII) entsprechen, so dass die Formeln II oder (nach Woodward) III wahrscheinlich erscheinen.
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    Helvetica Chimica Acta 32 (1949), S. 1306-1314 
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Reduktion von 20α, 21-Oxydo-17-iso-allopregnan-diol-(3β, 17 β)-monobenzoat-(3) mit Li[AlH4] gab das bekannte 17-Iso-allopregnan-triol-(3β, 17 β, 20α). Durch Hydrierung von 20β, 21-Oxydo-17-iso-allopregnan-diol-(3β, 17β)-monoacetat-(3) mit Li[AlH4] wurde das unbekannte 17-Iso-allopregnan-triol-(3β, 17β, 20β) hergestellt; dieses wurde durch sein Diacetat charakterisiert und seine Konstitution wurde durch Abbau zu Androstanol-(3β)-on-(17) bewiesen. Der bisher als dieses Triol bezeichnete Stoff erwies sich als Gemisch von zwei bekannten Verbindungen. Die früher festgelegte Konfiguration der 17-Iso-allopregnan-tetrole-(3β, 17β, 20,21) wurde durch diese Reaktionen erneut bestätigt.
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    Helvetica Chimica Acta 32 (1949), S. 1341-1344 
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Die Konzentration von freiem Glykokoll und Serin in der Rattenleber lässt sich durch die Ernährung beeinflussen. Der Glykokollgehalt ist bei der Eiweissfütterung gering, während Kohlehydrat-und Fettkost ihn erheblich ansteigen lassen. Das Serin ist nur bei fettreicher Ernährung stark erhöht. Den tiefsten Stand erreicht es bei Eiweissfütterung; bei Kohlehydratfutter und im Hunger wurden mittlere Werte gefunden.
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    Topics: Chemistry and Pharmacology
    Notes: Aus Tabelle 1 geht hervor, dass verschiedene Ernährung keinen deutlichen Einfluss auf die Gesamtkonzentration der freien Amino-säuren der Leber ausübt.
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    Helvetica Chimica Acta 32 (1949), S. 1360-1360 
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    Keywords: Chemistry ; Organic Chemistry
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    Topics: Chemistry and Pharmacology
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    Helvetica Chimica Acta 32 (1949), S. 1390-1402 
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Das Alkaloid Corynathein wurde durch Abbau mit Selen in eine Base C19H22N2, das Corynanthyrin, übergeführt. Durch Abbau letzterer Verbindung mit Ozon entstand ein Ozonid C19H22O3N2, das bei der Hydrolyse in ein Keton C19H22O2N2 überging. Letzteres liess sich hydrolytisch zu o-Aminopropiophenon und 3,4-Diäthylpyridin-6-carbonsäure aufspalten. Aus diesen Spaltstücken ergab sich die Konstitutionsformel des Corynanthyrins, die mit jener des Tetrabyrins nahe verwandt ist.
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    Helvetica Chimica Acta 32 (1949), S. 1433-1438 
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Die katalytische Hydrierung des Succinyldimalonesters wird beschrieben; sie verläuft nicht einheitlich und erweist sich nicht als geeigneter Weg, um zur Tetrahydrofuran-2,5-diessigsäure zu gelangen.
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    Helvetica Chimica Acta 32 (1949), S. 1517-1529 
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    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Periplogenin wird in 3β,5,14,21-Tetroxy-14-iso-pregnanon-(20) übergeführt. Ausgehend von diesem Tetrol sowie dem bereits beschriebenen 3-Monoacetat wird eine Reihe von Pregnanderivaten bereitet, unter anderem Progesteron, Desoxycorticosteron-acetat, 14-Oxy-14-iso-11-desoxy-corticosteron-acetat. Der letztgenannte Stoff wurde in kleiner Ausbeute bereits früher aus Digitoxigenin bereitet. Er ist mit Corticosteron isomer, erwies sich aber im Everse-de-Fremery-Test als unwirksam.
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    Helvetica Chimica Acta 32 (1949), S. 1505-1512 
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Le stilbène et deux de ses dérivés ont été soumis, à l'état dissous, à l'ozonation selon la méthode quantitative utilisée dans ce laboratoire.
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    Helvetica Chimica Acta 32 (1949), S. 1513-1517 
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    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Die Hammett'sche Säurefunktion H0 wurde für das System Phosphorsäure/Wasser innerhalb eines Konzentrationsbereiches von 0-85% (Gewichtsprozent) Phosphorsäure bestimmt.
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    Helvetica Chimica Acta 32 (1949), S. 1599-1607 
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    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Die durch Abbau von Gamabufotalin-diacetat mit KMnO4 erhaltene Säure konnte eindeutig als 3β, 11α-Diacetoxy-14-oxy-14-iso-ätiocholansäure identifiziert werden. Damit ist die Konstitution und Konfiguration des Gamabufotalins bewiesen. Bei der oben genannten Oxydation entsteht ein krystallisiertes neutrales Nebenprodukt, dem die Konstitution des 3β,11α-Diacetoxy-14-oxy-14-iso-20-keto-pregnan-21-säure-Lactons-(21→14) zukommt.
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    Helvetica Chimica Acta 32 (1949), S. 1613-1617 
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    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: DL-β-Methoxy-adipinsäure wurde mit Strychnin in die beiden optisch aktiven Antipoden gespalten. Sie zeigten in Chloroform eine spez. Drehung von [α]D18 = + 13,1° bzw. -14,5°. Zur Charakterisierung ist das Dianilid brauchbar.
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    Helvetica Chimica Acta 32 (1949), S. 1626-1632 
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    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Aus den unverseifbaren Anteilen des „shea-nut“-öls wurde ein tetracyclischer, zweifach ungesättigter Triterpenalkohol C30H50O (II) isoliert, der eine reaktionsfähige, in einer Isopropylidengruppe liegende, und eine reaktionsträge, vollständig substituierte Doppelbindung besitzt. Durch Entfernen der Hydroxylgruppe und der hydrierbaren Doppelbindung von II wurde ein bisher unbekannter, tetracyclischer Kohlenwasserstoff C30H52 (IX) gewonnen. Der Alkohol II ist mit dem von I. Heilbron, E. R. H. Jones und P. A. Robins unlängst beschriebenen Butyrospermol identisch.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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