Staining Natural Rubber with Silver Nitrate for Electron Microscopy

1977 ◽  
Vol 50 (4) ◽  
pp. 835-841 ◽  
Author(s):  
R. W. Smith ◽  
V. L. Folt
Keyword(s):  
Electron Microscopy ◽  
World War Ii ◽  
Natural Rubber ◽  
Silver Nitrate ◽  
Raw Materials ◽  
Natural Rubber Latex ◽  
Optical Microscope ◽  
Raw Material ◽  
World War ◽  
The One

Abstract Hevea brasiliensis or natural rubber (NR) has been used for over 500 years. Until World War II, it was the basic raw material of the rubber industry. Since that time, the use of synthetic polymers has steadily increased, but the importance of NR has not diminished. In fact, the future for the natural product is very promising since it is the one polymer that is obtainable without depleting fossil fuel raw materials. Natural rubber latex has been extensively studied by a variety of methods, especially the microscope. All of the early work with NR latex was conducted, of course, with the optical microscope. In the late 1940's the electron microscope began to be used, but at that time synthetic rubbers began to demand attention, and work on NR latex diminished. Perhaps investigators felt they knew all there was to know about the microscopical characteristics of this material. Indeed, some very fine work had been done and keen observations made with optical microscopes that could not even resolve all of the particles in a latex material. This paper deals with the electron microscopy of natural rubber latexes with particular attention to the proteinaceous layer on the particle and the fate of particles during varying stages of mastication. The critical technique used was to stain the proteinaceous layer of the latex particle with silver nitrate.

Specific Properties of Artificial [Buna] Rubber

1937 ◽  
Vol 10 (1) ◽  
pp. 17-28
Author(s):  
Albert Koch
Keyword(s):  
Natural Rubber ◽  
Raw Materials ◽  
Small Extent ◽  
Raw Material ◽  
World War ◽  
Methyl Group ◽  
Synthetic Product ◽  
Laboratory Results ◽  
Short Time ◽  
Resistance To Heat

Abstract Developments in the Synthesis of Rubber Because of the peculiar properties of natural rubber, its usefulness is somewhat limited, and in many fields of application it is quite unsuitable. In contact with oils and fats it swells rapidly and loses almost completely its good mechanical properties, and besides this natural rubber has poor resistance to heat. Again it is attacked rather easily by oxygen, and on exposure to oxygen and light simultaneously there is a particularly strong tendency to develop cracks within a short time; it is for such reasons that the chemical industries of various countries have been looking for an artificial or synthetic product which is free from the shortcomings of natural rubber or exhibits them to only a relatively small extent. Experimentation on artificial rubber has depended fundamentally on the discovery of Harries that the natural rubber molecule is constructed of isoprene units. Isoprene and its allied hydrocarbons were prepared by Hoffmann and his coworkers at the Elberfeld dye works, and these compounds were in turn polymerized to masses similar to rubber. These experiments were carried out before the World War. Because of a shortage of raw materials during the War, it was necessary to adapt the laboratory results to a factory scale sooner than should logically have been done. At that time the most readily available technical raw material was dimethylbutadiene, a compound which differs from isoprene by the presence of an extra methyl group, as may be seen in Table I.

scholarly journals The Staining of Polymers

2002 ◽  
Vol 10 (5) ◽  
pp. 5-7
Author(s):  
Ronald W. Smith
Keyword(s):  
Electron Microscopy ◽  
Natural Rubber ◽  
Natural Rubber Latex ◽  
Optical Microscope ◽  
Hot Water ◽  
Polymeric System ◽  
Rubber Latex ◽  
Naturally Occurring ◽  
Contrast Mechanism ◽  
In The Beginning

In the beginning there was water-the first stain that delineated structure within a polymeric system. The polymerwas natural rubber (NR) and the system was an air-dried film of natural latex. Grenquist reported in 1929 that a dried film of natural rubber latex soaked in hot water became milky (Figure 1) and, at that stage, the latex particles could be detected by the optical microscope (OM), The contrast mechanism was provided by the absorption of water by the naturally occurring proteinaceous layers present on the congealed NR particle surfaces. There was little demand for polymer staining until the age of electron microscopy.

Development of Natural Rubber Latex Foam for Hand Exercising Application

2020 ◽  
Vol 861 ◽  
pp. 154-158
Author(s):  
Surasit Kajon ◽  
Voranuch Somsongkul ◽  
Pimsiree Suwanna
Keyword(s):  
Electron Microscopy ◽  
Natural Rubber ◽  
Natural Rubber Latex ◽  
Raw Material ◽  
Accelerated Ageing ◽  
Hardness Index ◽  
Rubber Latex ◽  
Compression Set ◽  
Allergenic Potential ◽  
Scanning Electron

This study has developed an alternative compounding formulation and process for natural rubber latex (NRL) foams for hand exercising application. Deprotenized natural rubber latex was used as raw material and a combination of DIXP and TBzTD, which were fugitive and high molecular weight accelerators, respectively, was used to lower allergenic potential and harmful nitrosamines. The NRL foams were prepared to various densities, characterized by Scanning Electron Microscopy (SEM) and tested for hardness index, accelerated ageing and compression set in comparison to the foams with conventional compounding formulation. With the same processes, the foams with these two different formulations were found to have similar densities and hardness indices. However, the foams using DIXP and TBzTD accelerators performed better in compression set and accelerated ageing tests.

Epistemic competitions over Jewish Holocaust survivors’ stories in interviews

2021 ◽  
pp. 095792652199214
Author(s):  
Kim Schoofs ◽  
Dorien Van De Mieroop
Keyword(s):  
World War Ii ◽  
Holocaust Survivors ◽  
Identity Work ◽  
Epistemic Authority ◽  
World War ◽  
Master Narratives ◽  
The Social ◽  
Specialist Knowledge ◽  
Expert Status ◽  
The One

In this article, we scrutinise epistemic competitions in interviews about World War II. In particular, we analyse how the interlocutors draw on their epistemic authority concerning WWII to construct their interactional telling rights. On the one hand, the analyses illustrate how the interviewers rely on their historical expert status – as evidenced through their specialist knowledge and ventriloquisation of vicarious WWII narratives – in order to topicalise certain master narratives and thereby attempt to project particular identities upon the interviewees. On the other hand, the interviewees derive their epistemic authority from their first-hand experience as Jewish Holocaust survivors, on which they draw in order to counter these story projections, whilst constructing a more distinct self-positioning to protect their nuanced personal identity work. Overall, these epistemic competitions not only shaped the interviewees’ identity work, but they also made the link between storytelling and the social context more tangible as they brought – typically rather elusive – master narratives to the surface.

The public image of women in post-Taliban Afghanistan

2021 ◽  
pp. 44-49
Author(s):  
Dr Rose Fazli ◽  
Dr Anahita Seifi
Keyword(s):  
World War Ii ◽  
Political Development ◽  
Public Image ◽  
World War ◽  
Afghan Women ◽  
The Public ◽  
The Common ◽  
The One ◽  
The Relationship ◽  
Afghan Woman

The present article is an attempt to offer the concept of political development from a novel perspective and perceive the Afghan Women image in accordance with the aforementioned viewpoint. To do so, first many efforts have been made to elucidate the author’s outlook as it contrasts with the classic stance of the concept of power and political development by reviewing the literature in development and particularly political development during the previous decades. For example Post-World War II approaches to political development which consider political development, from the Hobbesian perspective toward power, as one of the functions of government. However in a different view of power, political development found another place when it has been understood via postmodern approaches, it means power in a network of relationships, not limited to the one-way relationship between ruler and obedient. Therefore newer concept and forces find their way on political development likewise “image” as a considerable social, political and cultural concept and women as the new force. Then, the meaning of “image” as a symbolic one portraying the common universal aspect is explained. The Afghan woman image emphasizing the historic period of 2001 till now is scrutinized both formally and informally and finally the relationship between this reproduced image of Afghan women and Afghanistan political development from a novel perspective of understanding is represented.

The Idiom of Scripture, Leviticus 18:5, and Theology at a Time of Paradigm Shift

2017 ◽  
Vol 47 (3) ◽  
pp. 155-170
Author(s):  
Merwyn S. Johnson
Keyword(s):  
World War Ii ◽  
Paradigm Shift ◽  
World War ◽  
Post World War Ii ◽  
The Bible ◽  
English Translations ◽  
The One ◽  
Law And Gospel

Leviticus 18:5b ( the one doing them shall live in them) offers a prism through which to view the idiom of Scripture—the distinctive dynamics and theology of the Bible. The verse pinpoints the interplay between God's doing-and-living and ours. At issue is whether the commandments reflect a “command-and-do” structure of life with God, which maximizes a quid pro quo dynamic between God and us; or do the commandments delineate a “covenant place where” we abide with God and God with us, as a gift of shared doing pure and simple? The article traces Leviticus 18:5b through both Old and New Testaments, to show how pervasive it is. The main post-World War II English translations misstate the verse at every turn, in contrast to the 16th-century Church Reformation, which understood the verse and the issue under the topic of Law and Gospel.

scholarly journals THE SIGNIFICANCE OF CONSUMERS COOPERATIVE SOCIETY IN PROVISIONING OF COLLECTIVE FARM PEASANTRY OF ALTAI LAND IN THE YEARS OF WORLD WAR II: IN TERMS OF POTTERY AND MANUFACTURE OF WOODEN SOLE BOOTS

2020 ◽  
pp. 115-119
Author(s):  
Tat’yana K. Shcheglova ◽  
Aleksey V Rykov
Keyword(s):  
World War Ii ◽  
Raw Materials ◽  
Poor Quality ◽  
Nazi Germany ◽  
Soviet System ◽  
World War ◽  
Collective Farm ◽  
Cooperative Society

The war between Nazi Germany and the USSR caused drastic changes in the Soviet system of distribution of goods. Reorientation of factories on military contracts led to diminishing of the centralised production of goods for consumers in rear areas. As a result, consumers cooperative society started to play an important role. The article considers the problems of consumers cooperative society and local enterprises which were its major suppliers. Through the example of pottery and manufacture of wooden sole boots diffi culties of reorganisation of enterprises in the context of war are revealed. The problems of interaction of local enterprises and consumers cooperative society are considered. In conclusion, the author points out that the major problem of reorganisation of enterprises in the context of war was the shortage of raw materials and the signifi cant factor of development was hand-crafted character of anufacturing. A certain problem was created by the reluctance of enterprises to deliver their production at artifi cially low state prices and its poor quality. The consequence of that was the decrease of signifi cance of consumers cooperative society and the increase of the ratio of market trade in provisioning of collective farm peasantry.

scholarly journals Human Rights at Stake: Shirley Jackson’s Social and Political Protest in “The Lottery”

2018 ◽  
Vol 7 (6) ◽  
pp. 28
Author(s):  
Zaid Ibrahim Ismael ◽  
Sabah Atallah Khalifa Ali
Keyword(s):  
Human Rights ◽  
World War Ii ◽  
Political Protest ◽  
World War ◽  
Her Family ◽  
Political Criticism ◽  
Political Implications ◽  
Social Custom ◽  
American Author ◽  
The One

Nowhere is American author Shirley Jackson’s (1916-1965) social and political criticism is so intense than it is in her seminal fictional masterpiece “The Lottery”. Jackson severely denounces injustice through her emphasis on a bizarre social custom in a small American town, in which the winner of the lottery, untraditionally, receives a fatal prize. The readers are left puzzled at the end of the story as Tessie Hutchinson, the unfortunate female winner, is stoned to death by the members of her community, and even by her family. This study aims at investigating the author’s social and political implications that lie behind the story, taking into account the historical era in which the story was published (the aftermath of the bloody World War II) and the fact that the victim is a woman who is silenced and forced to follow the tradition of the lottery. The paper mainly focuses on the writer’s interest in human rights issues, which can be violated even in civilized communities, like the one depicted in the story. The shocking ending, the researchers conclude, is Jackson’s protest against dehumanization and violence.

scholarly journals PEMANFAATAN MEKANISME ASEAN DALAM PENYELESAIAN MASALAH PERBATASAN THAILAND

2017 ◽  
Vol 15 (2) ◽  
pp. 105-138
Author(s):  
C.P.F. Luhulima
Keyword(s):  
World War Ii ◽  
Dispute Settlement ◽  
Dispute Settlement Mechanism ◽  
World War ◽  
Un Security Council ◽  
The Icj ◽  
The Hague ◽  
The One ◽  
Preah Vihear ◽  
Settlement Mechanism

AbstractThailand’s borders with Myanmar, Laos, Cambodiaand Malaysia have been established through amapping process within the framework of theTreaty of Westfalpha. Since the England andFrance left Southeast Asia after World War II,Thailand questioned its borders with itsneighbouring countries and since then the borderissue between Thailand and her neighboursbecame the major issue. The attempts to resolvethe border conflict between Thailand andMyanmar have been conducted through“constructive engagement”, and through her policyof “changing battlefields to market places”. TheASEAN approach has been employed in her borderconflict with Cambodia. Cambodia’s attempt toinvolve the UN Security Council has been respondedby the Council to involve ASEAN in its resolution.The failure of the ASEAN approach made Cambodiato submit the issue to the ICJ in The Hague in April2011. On November 11, 2013 ICJ decided thatPreah Vihear and its surrounding area belong toCambodia. The source of the conflict with Malaysiawas not primarily about border, but it was apolitical complaint. The rebellion at the border areawill thus not terminate until the Thai authoritiesunderstand the complaints of the Muslim-Malaysat the border area. The ASEAN mechanism toresolve the inter-state conflict consists of bilateral,trilateral approaches, through the High Council andthe United Nations. The application of stepsbetween Thailand and its neighbours are thebilateral, trilateral steps and the one through theInternational Courtof Justice in The Hague.Keywords: Thailand, Myanmar, Malaysia, Kamboja,ASEAN, Dispute Settlement Mechanism AbstrakBatas Kerajaan Thailand dengan Myanmar, Laos,Kamboja dan Malaysia dibentuk melalui prosespemetaan di dalam kerangka Traktat Westfalia.Ketika Inggris dan Prancis mengundurkan dirisesudah Perang Dunia II, Thailand mempersoalkanperbatasannya dengan negara-negara tetangganya,sehingga perbatasan menjadi pokokpermasalahan. Sengketa dengan Myanmar diupayakanpenyelesainnya melalui “constructiveengagement”, dan dengan kebijakannya “changingbattlefields to market places”. Pendekatan ASEANdigunakan untuk menyelesaikan konflik denganKamboja. Pelibatan Dewan Keamanan PBB dijawabdengan meminta kedua belah pihak melibatkanASEAN. Kegagalan pendekatan ASEAN menyebabkanKamboja mengajukan kasus ini ke ICJ padaApril 2011. Pada 11 November 2013 MahkamahInternasional di Den Haag memutuskan bahwaCandi Preah Vihear dan wilayah sekitarnya adalahmilik Kamboja. Permasalahan dengan Malaysiabukanlah masalah perbatasan antara keduanegara melainkan keluhan politik, sehinggapemberontakan di perbatasan tidak akan berakhirsampai penguasa Thailand memahami keluhanorang-orang Muslim-Melayu di perbatasan.Mekanisme ASEAN untuk mengatasi sengketaantarnegara anggota terdiri dari langkah bilateral,trilateral, melalui pembentukan Dewan Tinggi danmelalui lembaga hukum PBB. Yang di-terapkandalam kasus sengketa perbatasan antara Thailanddan negara tetangganya ialah pendekatanbilateral dan trilateral serta melalui LembagaPeradilan PBB.Kata kunci: Thailand, Myanmar, Malaysia,Kamboja, ASEAN, Mekanisme PenyelesaianPerselisihan

Fascism under Pressure

2009 ◽  
Vol 24 (1) ◽  
pp. 116-158 ◽  
Author(s):  
Ana Antic
Keyword(s):  
World War Ii ◽  
Racial Identity ◽  
Class Struggle ◽  
The Political ◽  
World War ◽  
Independent State ◽  
Anti Semitism ◽  
State And Society ◽  
National Boundaries ◽  
The One

This article analyzes how the ideological discourse of the Croatian fascist movement (the Ustaša) evolved in the course of World War II under pressures of the increasingly popular and powerful communist armed resistance. It explores and interprets the way the regime formulated its ideological responses to the political/ideological challenge of the leftist guerrilla and its propaganda in the period after the proclamation of the Ustaša Independent State of Croatia in 1941 until the end of the war. The author demonstrates that the regime, faced with its own political weakness and inability to maintain authority, shaped its rhetoric and ideological self-definition in a direct dialogue with the Marxist discourse of the communist propaganda, incorporating important Marxist concepts in its theory of state and society and redefining its concepts of national boundaries and racial identity to match the communists’ propaganda of inclusive, civic national Yugoslavism. This massive ideological renegotiation of the movement’s basic tenets and its consequent leftward shift reflected a change in an opposite direction from the one commonly encountered in narratives of other fascisms’ ideological evolution paths (most notably in Italy and Germany): as the movement became a regime, the Ustaša transformed from its initial conservatism, traditionalism (in both sociopolitical and cultural matters), pseudo-feudal worldview of peasant worship and antiurbanism, anti-Semitism, and rigid racialism in relation to nation and state into an ideology of increasingly inclusive, culture-based, and nonethnic nationalism and with an exceptionally strong leftist rhetoric of social welfare, class struggle, and the rights of the working class.

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