scholarly journals Achiral Zeolites as Reaction Media for Chiral Photochemistry

Molecules ◽  
2019 ◽  
Vol 24 (19) ◽  
pp. 3570 ◽  
Author(s):  
Ramamurthy
Keyword(s):  
Organic Molecules ◽  
Photochemical Reactions ◽  
Enantiomerically Pure ◽  
Chiral Induction ◽  
The Media ◽  
Modified Zeolites ◽  
The One ◽  
Reaction Media ◽  
Diastereomeric Excess ◽  
Current Emphasis

Obtaining enantiomerically-enriched photoproducts from achiral reactants has been a long-sought goal. The various methods developed to achieve chiral induction in photoproducts during the last fifty years still suffer from a lack of predictability, generality, and simplicity. With the current emphasis on green chemistry, obtaining enantiomerically enriched products via photochemistry is a likely viable alternative for the future. Of the various approaches developed during the last three decades, the one pioneered in the author’s laboratory involved the use of commercially-available and inexpensive achiral zeolites as the media. This approach does not use any solvent for the reaction. Examples from these studies are highlighted in this article. Since no chiral zeolites were available, when the work was initiated in the author’s laboratory, commercially-available zeolites X and Y were modified with chiral inductors so that the reaction space becomes chiral. The results obtained established the value of chirally-modified, commercial zeolites as media for achieving chiral induction in photochemical reactions. A recent report of the synthesis of a chiral zeolite is likely to stimulate zeolite-based chiral photochemistry in synthesizing enantiomerically-pure organic molecules. The availability of chiral zeolites in future is likely to energize research in this area. Our earlier observations on this topic, we believe, would be valuable for progress of the field. Keeping this in mind, I have summarized the work carried out in our laboratory on chiral photochemistry on chirally-modified zeolites. This review does not include examples where high chiral induction has been obtained via a strategy that examines molecules appended with chiral auxiliary within achiral and chirally-modified zeolites. The latter approach yields products with diastereomeric excess >80%.

Murder with Impunity: The Construction of Arab Masculinities and Honor Crimes

1970 ◽  
pp. 38-45
Author(s):  
May Abu Jaber
Keyword(s):  
Violence Against Women ◽  
Social Boundaries ◽  
Religious Institutions ◽  
The Social ◽  
The Family ◽  
The Media ◽  
The One ◽  
Male Authority ◽  
Cultural Networks ◽  
Gender Specific

Violence against women (VAW) continues to exist as a pervasive, structural,systematic, and institutionalized violation of women’s basic human rights (UNDivision of Advancement for Women, 2006). It cuts across the boundaries of age, race, class, education, and religion which affect women of all ages and all backgrounds in every corner of the world. Such violence is used to control and subjugate women by instilling a sense of insecurity that keeps them “bound to the home, economically exploited and socially suppressed” (Mathu, 2008, p. 65). It is estimated that one out of every five women worldwide will be abused during her lifetime with rates reaching up to 70 percent in some countries (WHO, 2005). Whether this abuse is perpetrated by the state and its agents, by family members, or even by strangers, VAW is closely related to the regulation of sexuality in a gender specific (patriarchal) manner. This regulation is, on the one hand, maintained through the implementation of strict cultural, communal, and religious norms, and on the other hand, through particular legal measures that sustain these norms. Therefore, religious institutions, the media, the family/tribe, cultural networks, and the legal system continually disciplinewomen’s sexuality and punish those women (and in some instances men) who have transgressed or allegedly contravened the social boundaries of ‘appropriateness’ as delineated by each society. Such women/men may include lesbians/gays, women who appear ‘too masculine’ or men who appear ‘too feminine,’ women who try to exercise their rights freely or men who do not assert their rights as ‘real men’ should, women/men who have been sexually assaulted or raped, and women/men who challenge male/older male authority.

Freedom of speech is not freedom from ethics: the 2019 Israel Folau media controversy as a case study

2021 ◽  
pp. 1329878X2199289
Author(s):  
Jay Daniel Thompson ◽  
Denis Muller
Keyword(s):  
Content Analysis ◽  
Freedom Of Speech ◽  
Rugby Player ◽  
Ethical Principles ◽  
Framing Analysis ◽  
The Media ◽  
The One

This article examines how freedom of speech is framed in the media controversy surrounding the Australian rugby player Israel Folau’s April 2019 Instagram post. A content analysis and framing analysis of newspaper reportage reveals that the controversy has been largely discussed in terms of whether or not Folau’s speech was being curtailed and whether this curtailing indicates a broader, ideologically motivated censoriousness. This discussion is problematic in that it says little about the actual substance of Folau’s post. This article argues that debates surrounding freedom of speech such as the one involving Folau could and should be enriched by an engagement with ethical principles. This engagement is premised on a commitment to the free exchange of views, while acknowledging that ‘speech’ is not always inherently beneficial for democracy, nor worth defending.

scholarly journals Biocatalytic Transformation of 5-Hydroxymethylfurfural into 2,5-di(hydroxymethyl)furan by a Newly Isolated Fusarium striatum Strain

Catalysts ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 216
Author(s):  
Alberto Millán ◽  
Núria Sala ◽  
Mercè Torres ◽  
Ramon Canela-Garayoa
Keyword(s):  
Fusarium Species ◽  
Inoculum Size ◽  
High Recovery ◽  
23 Factorial Design ◽  
Organic Solvent Extraction ◽  
Working Volume ◽  
The Media ◽  
Substrate Feeding ◽  
High Concentrations ◽  
Reaction Media

The compound 2,5-di(hydroxymethyl)furan (DHMF) is a high-value chemical block that can be synthesized from 5-hydroxymethylfurfural (HMF), a platform chemical that results from the dehydration of biomass-derived carbohydrates. In this work, the HMF biotransformation capability of different Fusarium species was evaluated, and F. striatum was selected to produce DHMF. The effects of the inoculum size, glucose concentration and pH of the media over DHMF production were evaluated by a 23 factorial design. A substrate feeding approach was found suitable to overcome the toxicity effect of HMF towards the cells when added at high concentrations (>75 mM). The process was successfully scaled-up at bioreactor scale (1.3 L working volume) with excellent DHMF production yields (95%) and selectivity (98%). DHMF was purified from the reaction media with high recovery and purity by organic solvent extraction with ethyl acetate.

scholarly journals “As quiet as a mouse”: Media use in Azerbaijan

2020 ◽  
Vol 45 (s1) ◽  
pp. 893-911
Author(s):  
Ilgar Seyidov
Keyword(s):  
Soviet Union ◽  
Media Use ◽  
Structured Interview ◽  
Soviet Period ◽  
Political Systems ◽  
Media System ◽  
The Soviet Union ◽  
Supportive Role ◽  
The Media ◽  
The One

AbstractDuring the Soviet period, the media served as one of the main propagandist tools of the authoritarian regime, using a standardized and monotype media system across the Soviet Republics. After the collapse of the Soviet Union, 15 countries became independent. The transition from Soviet communism to capitalism has led to the reconstruction of economic, socio-cultural, and political systems. One of the most affected institutions in post-Soviet countries was the media. Media have played a supportive role during rough times, when there was, on the one hand, the struggle for liberation and sovereignty, and, on the other hand, the need for nation building. It has been almost 30 years since the Soviet Republics achieved independence, yet the media have not been freed from political control and continue to serve as ideological apparatuses of authoritarian regimes in post-Soviet countries. Freedom of speech and independent media are still under threat. The current study focuses on media use in Azerbaijan, one of the under-researched post-Soviet countries. The interviews for this study were conducted with 40 participants living in Nakhichevan and Baku. In-depth, semi-structured interview techniques were used as research method. Findings are discussed under six main themes in the conclusion.

Die Macht der Bilder und Bilder der Macht: die sprachliche Konstruktion von Nationalismus und Konservatismus in der strategischen politischen Kommunikation von Vox España

2020 ◽  
Vol 136 (2) ◽  
pp. 538-566
Author(s):  
Sandra Issel-Dombert
Keyword(s):  
Language Use ◽  
Point Of View ◽  
Right Wing ◽  
Multimodal Discourse ◽  
The Social ◽  
Core Elements ◽  
The Media ◽  
Right Wing Populism ◽  
The One ◽  
The Relationship

AbstractFrom a theoretical and empirical linguistic point of view, this paper emphasizes the importance of the relationship between populism and the media. The aim of this article is to explore the language use of the Spanish right wing populism party Vox on the basis of its multimodal postings on the social network Instagram. For the analysis of their Instagram account, a suitable multimodal discourse analysis (MDA) provides a variety of methods and allows a theoretical integration into constructivism. A hashtag-analysis reveals that Vox’s ideology consists of a nativist and ethnocentric nationalism on the one hand and conservatism on the other. With a topos analysis, the linguistic realisations of these core elements are illustrated with two case studies.

Language as social practice

2008 ◽  
Vol 7 (1) ◽  
pp. 53-70 ◽  
Author(s):  
Mohammad Amouzadeh
Keyword(s):  
Social Life ◽  
Social Practice ◽  
Social Power ◽  
Analytical Investigation ◽  
Socially Constructed ◽  
Discourse Processes ◽  
Third Stage ◽  
The Media ◽  
Stage Development ◽  
The One

This paper aims to investigate the language used by newspapers in post-revolutionary Iran. More precisely, the paper sets out to analyze how such a language is deployed to represent relevant hegemonic ideologies. The approach adopted for this purpose draws inspiration mainly from critical linguistics, where it is hypothesized that, as far as the pertinent metadiscourse goes, media genres serve to activate and perpetuate social power relations. In keeping with this theoretical stance, the paper argues that socially constructed texts can be said to perform two complementary functions; on the one hand, they shed light on the realities experienced in social life; on the other, they reveal such aspects of those realities as are constructed through the use of language. It is thus in this context that the media language used in the post-revolutionary Iran lends itself to analytical investigation, where the available data reveal the co-existence of three competing discourse processes of ‘Islamization’, ‘Iranian Nationalism’ and ‘Western liberalism’, relating to the third stage development of post-revolutionary Iran.

scholarly journals Plant-Mediated Biotransformations of S(+)- and R(–)-Carvones

2018 ◽  
Vol 8 (12) ◽  
pp. 2605 ◽  
Author(s):  
Wanda Mączka ◽  
Daria Sołtysik ◽  
Katarzyna Wińska ◽  
Małgorzata Grabarczyk ◽  
Antoni Szumny
Keyword(s):  
Solanum Tuberosum L ◽  
Apium Graveolens ◽  
Petroselinum Crispum ◽  
Enzymatic System ◽  
Enantiomerically Pure ◽  
Daucus Carota L ◽  
Pyrus Communis L ◽  
Substrate Conversion ◽  
Diastereomeric Excess ◽  
Reduction Of Ketones

The enzymatic system of vegetables is well known as an efficient biocatalyst in the stereoselective reduction of ketones. Therefore, we decided to use the comminuted material of several plants including five vegetables (Apium graveolens L., Beta vulgaris L., Daucus carota L., Petroselinum crispum L., and Solanum tuberosum L.) and three fruits (Malus pumila L. “Golden” and “Kortland” as well as Pyrus communis L. “Konferencja”) to obtain enantiomerically pure carveol, which is commercially unavailable. Unexpectedly, all of the used biocatalysts not only reduced the carbonyl group of (4R)-(–)-carvone and (4S)-(+)-carvone, but also reduced the double bond in the cyclohexene ring. The results revealed that (4R)-(–)-carvone was transformed into (1R, 4R)- and (1S, 4R)-dihydrocarvones, and (1R,2R,4R)-dihydrocarveol. Although the enzymatic system of the potato transformed the substrate almost completely, the %de was not the highest. Potato yielded 92%; however, when carrot was used as the biocatalyst, it was possible to obtain 17% of (1R, 4R)-(+)-dihydrocarvone with 100% diastereomeric excess. In turn, the (4S)-(+)-carvone was transformed, using the biocatalysts, into (1R, 4S)- and (1S, 4S)-dihydrocarvones and dihydrocarveols. Complete substrate conversion was observed in biotransformation when potato was used. In the experiments using apple, (1R, 4S)-dihydrocarvone with 100% diastereomeric excess was obtained. Using NMR spectroscopy, we confirmed both diastereoisomers of 4(R)-1,2-dihydrocarveols, which were unseparated in the GC condition. Finally, we proved the high usefulness of vegetables for the biotransformation of both enantiomers of carvone as well as dihydrocarvone.

scholarly journals Graffiti as a sign: the semiotic approach to the study of the phenomenon

2019 ◽  
Vol 9 (18) ◽  
pp. 92-98
Author(s):  
Maria Chikarkova ◽  
Keyword(s):  
Cultural Context ◽  
Single Point ◽  
Point Of View ◽  
Urban Life ◽  
Street Art ◽  
The Media ◽  
Cultural Code ◽  
The One ◽  
Different Characteristics

Although graffiti is a well-known phenomenon of street art, there is still no single point of view on this phenomenon (even if it is considered art at all). Both the essence and the manifestations of graffiti remain a matter of debate - there are dozens of different classifications, that they are based on different characteristics. However, the phenomenon has rarely attracted attention from the point of view of semiotics, though it is the semiotic reading of graffiti that makes it possible to understand its nature more deeply. Due to semiotics we could create an integrative classification, which would combine stylistics and subject matter into one system. The article made exactly such an attempt –providing of the semiotic classification of graffiti, based on Ch. Peirce’s classification of semiotic signs. Graffiti is a sign, because it has a material shell of the latter, a marked object and rules of interpretation. It functions within the subculture and signifies the individual's desire to escape from the deterministic nature of urban life (J. Baudrillard). It is a culture of the semiosphere, which continuously gives rise to new connotations and, accordingly, generates new receptions. An important component of graffiti interpretation is the cultural code; it is not read outside the field of conventionality, cultural context. Decoding of graffiti can occur in three ways. From our point of view, it is appropriate to use S. Hall’sclassification. He suggested a scheme for "decrypting" messages in the media, however, in our opinion, his scheme works for any communicative act (including graffiti). He distinguished dominant ("dominant-hegemonic"), oppositional ("oppositional") and negotiated ("negotiated") decoding. In the graffiti situation, oppositional decoding prevails among ordinary recipients (passers-by). U. Eco called this type aberrant, because it provides "decryption" of text with a different code than the one it was created for. Authors of graffiti themselves are often not fully aware of what they createalso. Modern writers use techniques of op-art, Dadaism, surrealism, etc., without being very oriented in all these directions. When graffiti combines different types of art (for example, the combination of painting with literature), it takes into account the features of inter-semiotic translation, which makes the decoding situation even more complicated. We offercreating a semioticclassificationofgraffiti, that might be based on Ch. Peirce’s classification of semiotic signs, whichdistinguishthesigns-copies, signs-indexes, signs-symbols. It could help the essence of graffiti and decode them.

scholarly journals List apostolski Duodecimum saeculum Ojca Świętego św. Jana Pawła II z okazji tysiąc dwusetnej rocznicy Soboru Nicejskiego II. Miejsce ikony w wierze i rozumieniu św. Jana Pawła II

2020 ◽  
Vol 68 (4 Zeszyt specjalny) ◽  
pp. 57-71
Author(s):  
Urszula Mazurczak
Keyword(s):  
Religious Practice ◽  
Virgin Mary ◽  
Religious Art ◽  
Second Vatican Council ◽  
Vatican Council ◽  
The Media ◽  
The Many ◽  
The One ◽  
Spiritual Expression ◽  
The Church

The letter of the Holy Father John Paul II written in Rome in 1987, in the tenth year of His pontificate, on December 4th, on the day of memorial of Saint John Damascene, the doctor of the Church, on the Twelfth Centenary of finishing the controversy over the icon, is of great importance for the Pope’s program of ecumenism. The Holy Father indicated various directions of the dialogue, however, the one of the utmost importance concerned the agreement with the Orthodox Church, which was confirmed in the letters and in His other documents quoted in this paper. The image used to be essential for religious practice, for illustrating the word of prayer and of the song, in order to preserve the tradition of the Church. The strict prohibition introduced by the iconoclasm depreciated not only the artistic tradition of paintings but also the basic dogmas of Christ’s Incarnation and the one which introduced Virgin Mary as the Theotokos (the God-bearer). The ban constituted a threat not only for the icons but also for the Christian faith. In His Letter, the Pope underlined the important role of the Second Council of Nicaea which reintroduced icons and maintained and deepened the meaning of the cult in the faith of believers. Furthermore, the Holy Father indicated the connection with the Second Vatican Council in understanding the function and form of images in contemporary Church. Contemporary trends are overwhelmed by the impotence of the spiritual expression of sacral art, which is a great concern for the Pope. The Letter is, therefore, a dramatic warning of the threats for religious art in contemporary time, expressed by the Holy Father with these words: ‘The rediscovery of the Christian icon will also help in raising the awareness of the urgency of reacting against the depersonalizing and at times degrading effects of the many images that condition our lives in advertisements and the media.’ (DS, 11).

scholarly journals Wstrząsająca treść jako manipulacyjny element dyskursu konfliktu

2018 ◽  
Vol 9 ◽  
pp. 135-143
Author(s):  
Anna Hłuszko
Keyword(s):  
Hate Speech ◽  
Traditional Approach ◽  
Point Of View ◽  
Media Discourse ◽  
Visual Content ◽  
Political Situation ◽  
The Media ◽  
The Common ◽  
The One ◽  
Web News

Shock content as a manipulative component of conflict discourseDifficult socio-political situation in Ukraine creates specific media discourse, which in turn gives rise to a number of phenomena, connected to information war categories, war of meanings, hate speech etc. Active entry of military issues into web news content affects traditional approach to the media-text drafting. The report examines the trends of shock visual content and its announcement in the web headlines. The influence of the content emotionalization, which is one of the common features for conflict discourse, not only on text style, but also on features of page making, selection and use of photo illustrations, headline creation, is studied. The material covering military developments usually involve deaths, injuries, loss, destruction of settlements as a result of hostilities, that is, they focus on information on suffering of both military and civilians. This results in stronger integration of shock visual content into the news, which in turn may be used as manipulation and propaganda tool. On the one hand it is used to demonstrate crimes of the enemy, on the other — as an evidence of Ukrainian military success. From the point of view of ethic and humanism the justification of such tactic is doubtful in both cases. However, the study shows that open image of death, blood, injuries in the materials and the announcement of such content in headlines are the cause of high popularity of such publications, and this mainstreams the problem of dehumanizing impact both on material’s subjects and on media audience.

Sign in / Sign up

Export Citation Format

Share Document