The Mode of Action of Disulfide Accelerators of Vulcanization

1937 ◽  
Vol 10 (1) ◽  
pp. 158-163
Author(s):  
W. Langenbeck ◽  
H. C. Rhiem
Keyword(s):  
Organic Compounds ◽  
Mode Of Action ◽  
Common Knowledge ◽  
Inorganic Compounds ◽  
Technical Problem ◽  
The Other ◽  
Rubber Industry ◽  
Organic Catalysis ◽  
Catalytic Power ◽  
Organic Catalysts

Abstract The catalytic power of organic compounds in general has up to the present time been studied much less extensively than that of inorganic compounds. For about the last ten years, however, the first author has, in collaboration with a number of his students, attempted to fill this gap, though so far efforts have been confined to explaining the mode of action of natural enzymes by means of comparative experiments with organic catalysts. As a result of this work, a theory based on experimental facts has been developed to explain in a satisfactory way the action of enzymes. The other phase of organic catalysis is, strictly speaking, a technical problem. Why for instance should it not be practicable to utilize organic catalysts more extensively than heretofore in industry? If this problem is to be attacked, it seems reasonable to start with the particular industry which already uses organic catalysts to the greatest extent. This is, of course, the rubber industry. The important accomplishments of the chemical industry with respect to the development of vulcanization accelerators is already common knowledge, and the important task at present is not simply to increase the great number of accelerators already known. A problem of more practical value would seem to be to study the mechanism of the acceleration of vulcanization, about which relatively little has been known heretofore.

Phytoplankton Productivity

2017 ◽  
Author(s):  
John Raven
Keyword(s):  
Primary Production ◽  
Organic Compounds ◽  
Inorganic Carbon ◽  
Chemical Elements ◽  
Inorganic Compounds ◽  
Initial Energy ◽  
The Other ◽  
Phytoplankton Productivity ◽  
Cell Components ◽  
Nitrogen Phosphorus

This chapter describes the productivity of phytoplankton, from the initial energy and chemical requirements for photosynthesis to the rate of production of heterotrophic organisms. Phytoplankton are the planktonic organisms which account for most of the primary production in the ocean. Their characteristic trophic mode is the production of organic compounds using energy from light and chemical elements from inorganic compounds, known as phototrophy, or more strictly photolithotrophy. This process uses water as the electron donor and the reduction of inorganic carbon producing sugars, from which all other cell components are made using inorganic forms of nitrogen, phosphorus, and all the other chemical elements needed to produce cells.

Removal of Trace Metals From Wastewater by Activated Carbon

1973 ◽  
Vol 8 (1) ◽  
pp. 110-121
Author(s):  
A. Netzer ◽  
J.D. Norman
Keyword(s):  
Activated Carbon ◽  
Trace Metals ◽  
Organic Compounds ◽  
The Other ◽  
Published Data ◽  
Ph Adjustment ◽  
Nickel Silver ◽  
Ph Range ◽  
Carbon Treatment ◽  
Cobalt Copper

Abstract The merits of activated carbon for removal of organic compounds from wastewater have been well documented in the literature. On the other hand there is a lack of published data on the use of activated carbon for the removal of trace metals from wastewater. Experiments were designed to assess the possibility that activated carbon treatment would remove aluminum, cadmium, chromium, cobalt, copper, iron, lead, manganese, mercury, nickel, silver and zinc from wastewater. All metals studied were tested over the pH range 3-11. Greater than 99.5% removal was achieved by pH adjustment and activated carbon treatment for most of the metals tested.

scholarly journals Uptake and Metabolism of Tritiated 17ß-Oestradiol and Oestrone by Rabbit Uterine Tissue in vitro

1974 ◽  
Vol 27 (2) ◽  
pp. 137 ◽  
Author(s):  
RG Gabb ◽  
GM Stone
Keyword(s):  
Nuclear Receptor ◽  
Mode Of Action ◽  
Nuclear Extract ◽  
Lower Proportion ◽  
The Other ◽  
Uterine Tissue ◽  
Uptake And Metabolism

To determine whether the established capability of rabbit uterine tissue to interconvert 17 p-oestradiol and oestrone might have some effect on the mode of action of the oestrogens in this organ, the in vitro interconversion of [3H]-17p-oestradiol and [3H]oestrone by rabbit endometrial and myometrial tissue was investigated and the identity of radiometabolites in 'soluble, 'mitochondrial-microsomal' a'nd 'nuclear' preparations was studied. Both endometrial and myometrial tissue were found to be capable of oxidoreduction of the oestrogens, the equilibrium of the reaction favouring the reduction of oestrone. Irrespective of the tissue--steroid combination studied, the greater part of the radioactivity in all fractions was associated with 17p-oestradiol. The relative proportions of [3Hl-17p-oestradiol and [3H]oestrone varied between fractions, the nuclear preparation consistently showing a lower proportion of oestrone than the other fractions. Sephade<c fractionation of a 0'4M KCl 'nuclear extract' revealed that proportionately less oestrone than 17p-oestradiol was bound to the nuclear 'receptor'. These findings provide further evidence for 17p-oestradiol being the ovarian oestrogen which is active in the uterus, and suggest a role for uterine oxidoreduction of oestrogens in the control exercised over this organ by these steroids.

The Effect of Anticipatory Repudiation: Principle and Policy

1962 ◽  
Vol 20 (2) ◽  
pp. 213-233 ◽  
Author(s):  
P. M. Nienaber
Keyword(s):  
Proper Time ◽  
Common Knowledge ◽  
The Other ◽  
Entire Period ◽  
Sales Manager ◽  
Local Authorities ◽  
Contract Price ◽  
House Of Lords ◽  
Pertinent Question ◽  
Do So

IThe facts of the recent House of Lords decision, White and Carter (Councils), Ltd. v. McGregor, were so simple and have been canvassed so thoroughly as to be now practically a matter of common knowledge. The appellants' business consisted in the placing of advertisements, for a fee, on litter bins which were then distributed to various local authorities. They agreed to run the respondents' advertisement for a period of three years. The respondents repudiated on the ground that their sales manager who had concluded the contract had no authority to do so. The appellants refused to accept the repudiation and duly displayed the advertisements for the entire period, bringing at the proper time a suit for the full amount owing under the contract. The pertinent question was: were the appellants entitled to dismiss the repudiation and give effect to the contract on their side in order to secure performance on the other side; or rather were they obliged to adopt the repudiation as the end of the contract and the beginning of a suit for damages subject to mitigation? The latter view prevailed in all but the House of Lords where a majority of three to two preferred the former.In coming to this conclusion the House of Lords in effect overruled an earlier decision, viz., Langford and Co., Ltd. v. Dutch, the facts of which were virtually on all fours with those of the present case. In Langford's case the appellant was unsuccessful in recovering the contract price for exhibiting an advertisement film which he persisted in showing despite the respondent's repudiation of the contract.

Nano Particles and Their Mode of Action in Environment

2018 ◽  
pp. 212-219
Author(s):  
Rakesh Bhatt ◽  
Sandeep Gupta
Keyword(s):  
European Union ◽  
Human Activities ◽  
Mode Of Action ◽  
Biological Effects ◽  
Inorganic Compounds ◽  
Consumer Products ◽  
Nano Particles ◽  
Daily Activities ◽  
The World ◽  
Innovative Materials

Nano particles are particles that exist on a nanometer scale. Nanoparticles exist in our surrounding either naturally or created by human activities. As per Commission of European Union (2011), a nano-object needs only one of its characteristic dimensions to be in the range of 1-100nm to be classed as a nanoparticle even if its other dimensions are outside that range. Nanoparticles have revolutionized the world through the introduction of a unique class of material and consumer products in many fields due to production of innovative materials and devices. Despite their unique benefits and utility in daily activities, this could result in undesirable changes in the environment and affect the workplace. Carbon-based nanoparticles, oxides of metals, and natural inorganic compounds can have biological effects on the environment and human health. This chapter deals with the nanoparticles and their mode of action in the environment.

scholarly journals New Perspectives on Aspirin and the Endogenous Control of Acute Inflammatory Resolution

2006 ◽  
Vol 6 ◽  
pp. 1048-1065 ◽  
Author(s):  
Thea Morris ◽  
Melanie Stables ◽  
Derek W. Gilroy
Keyword(s):  
Mode Of Action ◽  
Acute Inflammation ◽  
Lipid Mediators ◽  
The Other ◽  
Endogenous Control ◽  
Protective Properties ◽  
Traditional Mode ◽  
Inflammatory Drugs ◽  
Cox 2 ◽  
Anti Inflammatory

Aspirin is unique among the nonsteroidal anti-inflammatory drugs in that it has both anti-inflammatory as well as cardio-protective properties. The cardio-protective properties arise form its judicious inhibition of platelet-derived thromboxane A2over prostacyclin, while its anti-inflammatory effects of aspirin stem from its well-established inhibition of prostaglandin (PG) synthesis within inflamed tissues. Thus aspirin and the other NSAIDs have popularised the notion of inhibiting PG biosynthesis as a common anti-inflammatory strategy based on the erroneous premise that all eicosanoids are generally detrimental to inflammation. However, our fascination with aspirin has shown a more affable side to lipid mediators based on our increasing interest in the endogenous control of acute inflammation and in factors that mediate its resolution. Epi-lipoxins (epi-LXs), for instance, are produced from aspirin’s acetylation of inducible cyclooxygenase 2 (COX-2) and together with Resolvins represent an increasingly important family of immuno-regulatory and potentially cardio-protective lipid mediators. Aspirin is beginning to teach us what nature knew all along – that not all lipid mediators are bad. It seems that while some eicosanoids are pathogenic in a variety of diseases, others are unarguable protective. In this review we will re-count aspirin’s colorful history, discuss its traditional mode of action and the controversies associated therewith, as well as highlight some of the new pathways in inflammation and the cardiovascular systems that aspirin has recently revealed.

The Third Place Game

2019 ◽  
Vol 21 (1) ◽  
pp. 64-86
Author(s):  
Netanel Nissim ◽  
Aner Sela
Keyword(s):  
Common Knowledge ◽  
The Other ◽  
Third Place ◽  
Second Stage ◽  
The Third ◽  
Other Hand ◽  
Strong Player ◽  
All Pay Auction ◽  
Total Effort

We study an elimination tournament with four contestants, each of whom has either a high value of winning (a strong player) or a low value of winning (a weak player) and these values are common knowledge. Each pairwise match is modeled as an all-pay auction. The winners of the first stage (semifinal) compete in the second stage (final) for the first prize, while the losers of the first stage compete for the third prize. We examine whether or not the game for the third prize is profitable for the designer who wishes to maximize the total effort of the players. We demonstrate that if the players are asymmetric and there are at least two strong players, then there is always a seeding of the players such that the third place game is not profitable. On the other hand, if there are at least two weak players, then there is always a seeding of the players such that the third place game is profitable.

Microchemical Method for Oxygen

1963 ◽  
Vol 46 (4) ◽  
pp. 559-564
Author(s):  
Al Steyermakk
Keyword(s):  
Organic Compounds ◽  
The Other ◽  
Gravimetric Procedure

Abstract A specific gravimetric procedure was submitted to the collaborators for this year’s study on the determination of oxygen in organic compounds. Three compounds were analyzed: one contained no oxygen, one contained only carbon, hydrogen, and oxygen, and the other was a sulfa compound. The results obtained were good, and the method is recommended as official, first action.

Some Observations on Taeniid Ovicides: The Effects of Some Organic Compounds and Pesticides on Activity and Hatching

1967 ◽  
Vol 41 (2-3) ◽  
pp. 167-210 ◽  
Author(s):  
A. Mackie ◽  
I. W. Parnell
Keyword(s):  
Organic Compounds ◽  
Inorganic Compounds ◽  
Preliminary Screening ◽  
Insignificant Effect

The results are given of the preliminary screening of many organic compounds and pesticides and of a few inorganic compounds on the eggs of T. hydatigena and T. ovis.Over fifty of these chemicals had little, if any, effect on activity or on hatching, the majority of the others had only an insignificant effect. Moreover, many of the most effective were hindered by the protection of proglottids. Furthermore, some could not be used in practice.

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