Natural and Synthetic Rubber. XIV. A Structural Formula for Ebonite

1934 ◽  
Vol 7 (3) ◽  
pp. 520-524
Author(s):  
Thomas Midgley ◽  
Albert L. Henne ◽  
A. F. Shepard
Keyword(s):  
Carbon Atom ◽  
Structural Formula ◽  
The Other ◽  
Pyrolysis Products ◽  
Methyl Group ◽  
Synthetic Rubber ◽  
The One ◽  
Natural And Synthetic

Abstract A formula for ebonite has been proposed, where sulfur is linked to a carbon atom bearing a methyl group on the one side and to the next third carbon atom of the rubber chain on the other side This formula is based on a consideration of the pyrolysis products of ebonite.

Natural and Synthetic Rubber. XIV. A Structural Formula for Ebonite

1934 ◽  
Vol 56 (6) ◽  
pp. 1326-1328 ◽  
Author(s):  
Thomas Midgley ◽  
Albert L. Henne ◽  
A. F. Shepard
Keyword(s):  
Structural Formula ◽  
Synthetic Rubber ◽  
Natural And Synthetic

scholarly journals The Relation between the Crystal Symmetry of the Simpler Organic Compounds and their Molecular Constitution.- Part III

1914 ◽  
Vol 90 (615) ◽  
pp. 1-19
Author(s):  
Walter Wahl
Keyword(s):  
Carbon Atom ◽  
Low Temperature ◽  
Crystal Symmetry ◽  
Experimental Results ◽  
The Other ◽  
Practical Reasons ◽  
Ordinary Temperature ◽  
Molecular Constitution ◽  
The One ◽  
The Relationship

The investigation of the crystalline properties of the simpler organic bodies, gaseous or liquid at Ordinary temperature, has been described in Parts I and II.* In this paper the experimental results will be discussed with regard to their bearing upon the problem of the relationship between molecular constitution and crystal symmetry. In order to facilitate a comparison the experimental results are summarised in the table on p. 2. As seen from the table, more than 50 per cent, of the substances investigated are polymorphic, and to this class nearly all the substances which contain only one carbon atom belong. The question therefore arises which one of the crystalline modifications of a substance is to be compared with the one or the other form of another substance, or with the crystals of a substance of which only one modification is known. In most of the cases investigated very little is known with regard to the modification stable at low temperature, and thus for practical reasons only the form crystallising directly out of the liquid state can be taken into account.

Bisphosphonates in Bone Diseases Treatment

2017 ◽  
Vol 68 (2) ◽  
pp. 246-249 ◽  
Author(s):  
Adela Cristina Lazar ◽  
Mariana Pacurar ◽  
Radu Septimiu Campian
Keyword(s):  
Side Effects ◽  
Carbon Atom ◽  
Oxygen Atom ◽  
Binding Capacity ◽  
Chemical Compounds ◽  
Bone Diseases ◽  
The Other ◽  
Complex Chemical ◽  
The One ◽  
Cancer Diseases

Bisphosphonates are the most frequently used drugs in the treatment of various bone and cancer diseases. They are complex chemical compounds, having a structure similar to that of pyrophosphates, but with certain differences: i.e., bisphosphonates have P-C-P in their composition; instead of an oxygen atom, a carbon atom is present. The R1 and R2 chains bind to the carbon atom and thus, the antiresorptive capacity of bisphosphonates on the one hand, and their bone-binding capacity on the other hand are stimulated. Through their action, they favor the treatment of diseases for which they have been prescribed, but they can also favor a number of undesired side effects.

The chemistry of pyrrolic compounds. LVII. The oxidative cyclization of derivatives of 1,19-dideoxybilenes-b

1984 ◽  
Vol 37 (10) ◽  
pp. 2085 ◽  
Author(s):  
PS Clezy ◽  
Lv Thuc
Keyword(s):  
Carbon Atom ◽  
Basic Mechanism ◽  
Ring System ◽  
Oxidative Cyclization ◽  
The Other ◽  
Terminal Position ◽  
Methyl Group ◽  
Derivatives Of

A study of the oxidative cyclization of 13C-labelled bilenes-b substituted with a methyl group at one terminal position and a formyl equivalent at the other, e.g. (1), has clearly established that the methyl group provides the carbon atom to complete the ring system. The basic mechanism of this reaction is discussed.

Natural and Synthetic Rubber. VIII. Products of the Destructive Distillation of Sodium Rubber

1932 ◽  
Vol 5 (1) ◽  
pp. 1-6
Author(s):  
Thomas Midgley ◽  
A. L. Henne ◽  
A. F. Shepard
Keyword(s):  
Double Bond ◽  
Natural Rubber ◽  
Ethylenic Bond ◽  
Methyl Groups ◽  
Pyrolysis Products ◽  
Synthetic Rubber ◽  
Natural And Synthetic

Abstract The pyrolysis products of sodium rubber have been compared with those of natural rubber. They indicate that sodium rubber is isomeric with natural rubber in the positioning of its methyl groups, and that the double bond of sodium rubber differs from the true ethylenic bond of natural rubber. In the latter respect sodium rubber closely resembles overvulcanized rubber.

Synthesis of tridentate amine Pt(II) complexes and study of their reactions with purine and pyrimidine bases

1994 ◽  
Vol 72 (5) ◽  
pp. 1225-1229
Author(s):  
Fernande D. Rochon ◽  
Guylaine Laperrière
Keyword(s):  
The Other ◽  
New Method ◽  
Direct Reaction ◽  
Chloro Complexes ◽  
Methyl Group ◽  
Alkyl Groups ◽  
Nmr Techniques ◽  
Pyrimidine Bases ◽  
The One ◽  
Derivatives Of

Complexes of the type [Pt(L)X] where L is a tridentate N ligand and X = Cl or I, were synthesized and characterized. Three of the ligands are N-derivatives of diethylenetriamine, (2-aminoethyl)(N-dimethyl-2-aminoethyl)amine, (2-aminoethyl)(N-diethyl-2-aminoethyl)amine, and (2-aminoethyl)(N-methyl-2-aminoethyl)N-methylamine. The other two ligands are di(3-amino-propyl)amine and (2-aminoethyl)(3-aminopropyl)amine. A new method for the synthesis of the chloro complexes from the direct reaction of the amine with K2[PtCl4] was developed. The reactions of these five compounds with several purine and pyrimidine bases were studied by NMR techniques. The Pt(II) complexes containing two five-membered chelates were shown to be more reactive than the one containing two six-membered rings, while the complex containing one five- and one six-membered chelates showed intermediate reactivity. For the diethylenetriamine derivatives, the complexes containing ligands with two alkyl groups on the same terminal N atom were more reactive than the one containing one methyl group on a terminal N atom and one methyl group on a non-terminal N atom.

Natural and Synthetic Rubber. IX. The Products of Destructive Distillation of Ebonite

1932 ◽  
Vol 5 (4) ◽  
pp. 530-536
Author(s):  
Thomas Midgley ◽  
Albert L. Henne ◽  
Alvin F. Shepard
Keyword(s):  
Structural Formula ◽  
Synthetic Rubber ◽  
Natural And Synthetic

Abstract The following compounds have been identified in the products obtained from ebonite by destructive distillation: 2-methylthiophene, 2,3-dimethylthiophene, 2,4-dimethylthiophene, 2,5-methylethylthiophene and m-xylene. These results will be used to derive the structural formula of ebonite.

Note on Selection of Coordinate Systems for Geodynamics

1975 ◽  
Vol 26 ◽  
pp. 395-407
Author(s):  
S. Henriksen
Keyword(s):  
Sea Level ◽  
The Other ◽  
Coordinate Systems ◽  
Mean Sea Level ◽  
The Earth ◽  
The One ◽  
Static Systems ◽  
Selection Of

The first question to be answered, in seeking coordinate systems for geodynamics, is: what is geodynamics? The answer is, of course, that geodynamics is that part of geophysics which is concerned with movements of the Earth, as opposed to geostatics which is the physics of the stationary Earth. But as far as we know, there is no stationary Earth – epur sic monere. So geodynamics is actually coextensive with geophysics, and coordinate systems suitable for the one should be suitable for the other. At the present time, there are not many coordinate systems, if any, that can be identified with a static Earth. Certainly the only coordinate of aeronomic (atmospheric) interest is the height, and this is usually either as geodynamic height or as pressure. In oceanology, the most important coordinate is depth, and this, like heights in the atmosphere, is expressed as metric depth from mean sea level, as geodynamic depth, or as pressure. Only for the earth do we find “static” systems in use, ana even here there is real question as to whether the systems are dynamic or static. So it would seem that our answer to the question, of what kind, of coordinate systems are we seeking, must be that we are looking for the same systems as are used in geophysics, and these systems are dynamic in nature already – that is, their definition involvestime.

Stories and the Self

2020 ◽  
Vol 32 (2) ◽  
pp. 47-58 ◽  
Author(s):  
Stefan Krause ◽  
Markus Appel
Keyword(s):  
Meta Analysis ◽  
The Self ◽  
The Other ◽  
Lower Degree ◽  
Contrast Effects ◽  
Self Perception ◽  
Self Perceptions ◽  
Other Hand ◽  
The One ◽  
Implicit And Explicit

Abstract. Two experiments examined the influence of stories on recipients’ self-perceptions. Extending prior theory and research, our focus was on assimilation effects (i.e., changes in self-perception in line with a protagonist’s traits) as well as on contrast effects (i.e., changes in self-perception in contrast to a protagonist’s traits). In Experiment 1 ( N = 113), implicit and explicit conscientiousness were assessed after participants read a story about either a diligent or a negligent student. Moderation analyses showed that highly transported participants and participants with lower counterarguing scores assimilate the depicted traits of a story protagonist, as indicated by explicit, self-reported conscientiousness ratings. Participants, who were more critical toward a story (i.e., higher counterarguing) and with a lower degree of transportation, showed contrast effects. In Experiment 2 ( N = 103), we manipulated transportation and counterarguing, but we could not identify an effect on participants’ self-ascribed level of conscientiousness. A mini meta-analysis across both experiments revealed significant positive overall associations between transportation and counterarguing on the one hand and story-consistent self-reported conscientiousness on the other hand.

Radioimmunotherapy for treatment of acute myeloid leukaemia and myelodysplastic syndrome

2005 ◽  
Vol 44 (03) ◽  
pp. 107-117
Author(s):  
R. G. Meyer ◽  
W. Herr ◽  
A. Helisch ◽  
P. Bartenstein ◽  
I. Buchmann
Keyword(s):  
Acute Myeloid Leukaemia ◽  
Myeloid Leukaemia ◽  
Primary Tumour ◽  
The Other ◽  
Haematopoietic Stem Cell ◽  
Other Hand ◽  
Primary Reduction ◽  
The One ◽  
Acute Myeloid

SummaryThe prognosis of patients with acute myeloid leukaemia (AML) has improved considerably by introduction of aggressive consolidation chemotherapy and haematopoietic stem cell transplantation (SCT). Nevertheless, only 20-30% of patients with AML achieve long-term diseasefree survival after SCT. The most common cause of treatment failure is relapse. Additionally, mortality rates are significantly increased by therapy-related causes such as toxicity of chemotherapy and complications of SCT. Including radioimmunotherapies in the treatment of AML and myelodyplastic syndrome (MDS) allows for the achievement of a pronounced antileukaemic effect for the reduction of relapse rates on the one hand. On the other hand, no increase of acute toxicity and later complications should be induced. These effects are important for the primary reduction of tumour cells as well as for the myeloablative conditioning before SCT.This paper provides a systematic and critical review of the currently used radionuclides and immunoconjugates for the treatment of AML and MDS and summarizes the literature on primary tumour cell reductive radioimmunotherapies on the one hand and conditioning radioimmunotherapies before SCT on the other hand.

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