scholarly journals Comparison of Three Deoxidation Agents for Ozonated Broths Used in Anaerobic Biotechnological Processes

Processes ◽  
2019 ◽  
Vol 7 (2) ◽  
pp. 65
Author(s):  
Ewelina Pawlikowska ◽  
Jaroslaw Domanski ◽  
Piotr Dziugan ◽  
Joanna Berlowska ◽  
Weronika Cieciura-Wloch ◽  
...  

Anaerobic fermentation of organic compounds is used in many biotechnological processes and has been the subject of much research. A variety of process conditions and different growth media can be used to obtain microbial metabolites. The media must be free from contamination before fermentation. Sterilization is most often achieved by applying heat or other treatments, such as ozonation. Sterilization of liquid media using ozone can be very beneficial, but this method introduces high concentrations of residual oxygen, which inhibit anaerobic processes. Deoxidation is therefore necessary to remove the oxygen from ozonated broths. This study evaluates the effectiveness of three deoxidation agents for two kinds of fermentation media based on malt or molasses: ultrasound, iron(II) sulfate, and Metschnikowia sp. yeast. The time needed for deoxidation varied, depending on the kind of broth and the deoxidation agent. In general, the dynamics of oxygen removal were faster in malt broth. A comparative analysis showed that yeast biomass was the most effective agent, achieving deoxidation in the shortest time. Moreover, the fully deoxidated broth was supplemented with yeast biomass, which is rich in biogenic substrates, expressed as a protein content of 0.13–0.73 g/L. Application of Metschnikowia sp. may therefore be considered as an effective strategy for simultaneous deoxidation and nutrient supplementation of broths used in anaerobic biotechnological processes.

1992 ◽  
Vol 25 (2) ◽  
pp. 185-190 ◽  
Author(s):  
B. H. Rosen ◽  
B. W. MacLeod ◽  
M. R. Simpson

Anabaena circinalis (Kutz.) Rabenhorst was isolated during a taste and odor episode characterized by high concentrations of geosmin, with raw water containing up to 45 ng geosmin/L. This species has been successfully cultured with sustained geosmin synthesis on both sterile river water and defined medium. Gas chromatography of cellular extracts and closed-loop stripping of growth media indicated that this organism produces geosmin and not 2-methylisoborneol (MIB). With cultures we examined the changes in cell-associated geosmin, chlorophyll and released geosmin during exponential and stationary growth phases of Anabaena. Cell-associated geosmin samples were collected daily from cultures and filtered onto a polycarbonate filter, extracted in acetone, and quantified by capillary gas Chromatograph using flame ionization detection. Media-associated geosmin was quantified from algae-free filtrates from each culture concentrated by closed-loop stripping and analyzed as above. Cell-associated geosmin averaged at 8 × 10−6 ng geosmin/cell in the exponential phase and dropped to 2.5 × 10−6 ng geosmin/cell in the stationary phase of growth. The loss in cell-associated geosmin was accompanied by an increase in geosmin released into the media. Media-associated geosmin reached 12 ng/mL in the stationary phase. Apparently cell lysis in the stationary phase caused the release of cell-associated geosmin into the media. Cell-associated geosmin was closely correlated with filament number (average r2 from 4 experiments =0.96) during the exponential growth phase and was correlated with chlorophyll a (average r2 from 3 experiments =0.95).


2015 ◽  
Vol 8 (2) ◽  
pp. 93
Author(s):  
Juniar Siregar

This study presents a research report on improving students’ Learning results on IPA through Video. The objective was to find out whether students’ learning result improved when they are taught by using Video. It was conducted using classroom action research method. The subject of the study was the Grade IV students of SDN 187/IV Kota Jambi which is located on Jln. Adi Sucipto RT 05 Kecamatan Jambi Selatan, and the number of the students were 21 persons. The instruments used were test. In analyzing the data, the mean of the students’ score for the on fisrt sycle was 65,4 (42,85%) and the mean on cycle two was 68,5 (37,15%) and the mean of the third cycle was 81,4 (100%). Then it can be concluded that the use of video on learning IPA can improve the students’ learning result. It is suggested that teachers should use video as one of the media to improve students’ learning result on IPA.Keywords : IPA, students’ learning result, video


Author(s):  
Theodora Aruan ◽  
Abdul Hamid K ◽  
Samsidar Tanjung

Abstrak: Penelitian ini bertujuan untuk: (1) mengembangkan multimedia pembelajaran pada mata kuliah Pengetahuan Alat Pengolahan dan Penyajian Makanan yang layak digunakan pada mahasiswa program studi Tata Boga. (2) mengetahui efektifitas multimedia pembelajaran pada mata kuliah Pengetahuan Alat Pengolahan dan Penyajian Makanan program studi Tata Boga. Penelitian menggunakan model pengembangan produk Borg and Gall yang dipadu dengan model desain pembelajaran dari Dick and Carey. Metode penelitian ini terdiri dari dua tahapan, yang mana pada tahap I merupakan tahap uji coba produk yang terdiri dari: (1) validasi ahli desain pembelajaran, (2) validasi ahli materi pelajaran, (3) validasi ahli media pembelajaran, (4) uji coba perorangan, (5) uji coba kelompok kecil, dan (6) uji coba lapangan terbatas. Hasil penelitian menunjukkan: (1) uji ahli desain pembelajaran berada pada kualifikasi sangat baik (82,17%), (2) uji ahli materi berada pada kualifikasi sangat baik (89,5%), (3) uji ahli media berada pada kualifikasi sangat baik (85%), (4) uji coba perorangan berada pada kualifikasi sangat baik (87%),  (5) uji coba kelompok kecil berada pada kualifikasi sangat baik (86%), dan (6) uji coba lapangan terbatas berada pada kualifikasi sangat baik (83,8%). Kata Kunci: multimedia, pembelajaran, pengetahuan alat pengolahan dan penyajian makanan Abstract: This study aims to: (1) develop learning multimedia in the subject of Knowledge Processing and Presentation Tools that are suitable for use in culinary study program students. (2) knowing the effectiveness of learning multimedia in the subject of Food Processing and Food Processing Program Knowledge and Processing Tools. The study used the Borg and Gall product development model combined with learning design models from Dick and Carey. This research method consists of two stages, which in stage I is the product testing phase which consists of: (1) validation of learning design experts, (2) expert material validation, (3) validation of learning media experts, (4) test try individuals, (5) small group trials, and (6) limited field trials. The results showed: (1) the learning design expert test was in very good qualification (82.17%), (2) the material expert test was in very good qualification (89.5%), (3) the media expert test was in the qualification very good (85%), (4) individual trials are in very good qualifications (87%), (5) small group trials are in very good qualifications (86%), and (6) limited field trials are at very good qualification (83.8%). Keywords: multimedia, learning, knowledge of processing and serving food


Jurnal KATA ◽  
2018 ◽  
Vol 2 (1) ◽  
pp. 89
Author(s):  
Nanny Sri Lestari

<p>Sebuah peristiwa, dalam kehidupan manusia, dapat menjadi inspirasi bagi penulisan sebuah cerita. Pengarang, sebagai bagian dari masyarakatnya, mengangkat relung-relung kehidupan manusia, ke dalam sebuah cerita. Namun harus dipahami, bahwa pengalaman pengarang dalam kehidupannya sehari-hari, juga mempengaruhi subjek yang ditulisnya. Saat ini tidak dapat dipungkiri lagi, bahwa teknologi komunikasi yang sangat canggih, telah mempengaruhi perkembangan karya sastra. Media penulisan karya sastra, tidak lagi melalui media cetak seperti kertas tetapi sudah melalui peralatan modern yang sesuai jamannya. Namun demikian ragam karya sastra prosa, seperti cerita pendek, justru mampu mengisi ruang media kommunikasi tersebut. Dua orang pengarang, yang menulis cerita pendek di media masa, berusaha mengangkat isu tentang lingkungan. Isu yang diangkat, lebih menekankan kepada masalah lingkungan alam dengan mengangkat isu tentang pohon sebagai bagian dari kehidupan manusia. Tujuan penelitian ini, untuk menelusuri struktur cerita pendek yang mengangkat isu lingkungan dalam jalinan ceritanya. Untuk memenuhi tujuan penelitian, langkah awal dari penelitian ini, adalah melakukan pendekatan struktur cerita, yang kemudian dikaitkan dengan pencarian makna cerita tersebut. Sering sekali di balik sebuah cerita ada pesan yang ingin disampaikan kepada masyarakat pembacanya. Bentuk pesan tersebut tersirat, dalam jalinan struktur cerita pendek tersebut. Pesan yang disampaikan, dalam kedua cerita pendek tersebut,  adalah pesan tentang lingkungan alam, yang  saat ini tidak pernah diperhatikan oleh masyarakat. Dengan alasan, kebutuhan ekonomi yang sangat dominan.</p><p><em>An event, in human life, can be an inspiration for writing a story. The author, as a part of his society, lifts the niches of human life, into a story. But it must be understood, that the author's experience in everyday life, also affects the subject he wrote.</em><em> </em><em>Today it is undeniable, that highly sophisticated communication technology, has influenced the development of literary works. Media writing literature, no longer through print media such as paper but have been through modern equipment that fit his era.</em><em> </em><em>However, the variety of prose literary works, such as short stories, is able to fill the media space communications. Two authors, who write short stories in the mass media, try to raise issues about the environment. Issues raised, more emphasis on the issue of the natural environment by raising the issue, about the tree as part of human life. The purpose of this research, is to trace the structure of short stories, which raised environmental issues in the composition of the story. To fulfill the purpose of research, the first step of this research, is to approach the structure of the story, which is then linked with the search for the meaning of the story. Very often, behind a story, there is a message to be conveyed to the readers. The form of the message is implied, in the composition of the short story structure. The message conveyed, in both short stories, is a message about the natural environment, which today is never noticed by society. The message conveyed, in both short stories, is a message about the natural environment, which today is never noticed by society.</em></p>


Author(s):  
Liana MacDonald ◽  
Adreanne Ormond

Racism in the Aotearoa New Zealand media is the subject of scholarly debate that examines how Māori (Indigenous Peoples of New Zealand) are broadcast in a negative and demeaning light. Literature demonstrates evolving understandings of how the industry places Pākehā (New Zealanders primarily of European descent) interests at the heart of broadcasting. We offer new insights by arguing that the media industry propagates a racial discourse of silencing that sustains widespread ignorance of the ways that Pākehā sensibilities mediate society. We draw attention to a silencing discourse through one televised story in 2018. On-screen interactions reproduce and safeguard a harmonious narrative of settler–Indigenous relations that support ignorance and denial of the structuring force of colonisation, and the Television Code of Broadcasting Practice upholds colour-blind perceptions of discrimination and injustice through liberal rhetoric. These processes ensure that the media industry is complicit in racism and the ongoing oppression of Indigenous peoples.


Catalysts ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 216
Author(s):  
Alberto Millán ◽  
Núria Sala ◽  
Mercè Torres ◽  
Ramon Canela-Garayoa

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.


2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Marcos L. Corazza ◽  
Julia Trancoso

Abstract The search for sustainable ideas has gained prominence in recent decades at all levels of society since it has become imperative an economic, social, and environmental development in an integrated manner. In this context, biorefineries are currently present as the technology that best covers all these parameters, as they add the benefits of waste reuse, energy cogeneration, and fossil fuel substitution. Thus, the study of the various applicable biological matrices and exploring the technical capabilities of these processes become highly attractive. Thermodynamic modeling acts in this scenario as a fundamental tool for phase behavior predictions in process modeling, design, and optimization. Thus, this work aimed to systematize, using the PRISMA statement for systematic reviews, the information published between 2010 and 2020 on phase equilibria modeling in systems related to biorefineries to organize what is already known about the subject. As a result, 236 papers were categorized in terms of the year, country, type of phase equilibria, and thermodynamic model used. Also, the phase behavior predictions of different thermodynamic models under the same process conditions were qualitatively compared, establishing PC-SAFT as the model that best represents the great diversity of interest systems for biorefineries in a wide range of conditions.


Author(s):  
Peter John

British Politics provides an introduction to British politics with an emphasis on political science to analyse the fundamental features of British politics, and the key changes post-Brexit. Part A looks at constitutional and institutional foundations of the subject. Chapters in this part look at leadership and debating politics and law creation. The second part is about political behaviour and citizenship. Here chapters consider elections, the media, agenda setting, and political turbulence. The final part is about policy-making and delegation. The chapters in this part examine interest groups, advocacy, policy-making, governing through bureaucracy and from below, delegating upwards, and British democracy now.


2016 ◽  
Vol 51 (4) ◽  
pp. 491
Author(s):  
Ana Cláudia Munari ◽  
Taíssi Alessandra Cardoso da Silva

A partir da análise dos romances de Ricardo Lísias e da sua produção autocrítica, este trabalho busca entender algumas relações entre a literatura de autoficção e a publicização do sujeito autor imerso no universo midiático. Partindo de uma revisão bibliográfica que conceitua os objetos aqui circunscritos e de uma apreciação anterior sobre a produção literária de jovens escritores brasileiros selecionados pela revista Granta em 2012, estreitamos nossa focalização no movimento do romancista em direção à escrita de si e à autorreferência. Nesse sentido, analisamos e contextualizamos a modalidade de escritura denominada autoficção, especialmente no que tange às aproximações entre as instâncias do narrador e do autor e entre biografemas e ficção (FIGUEIREDO, 2013; KLINGER, 2012), e evocamos estudos da Sociologia e da Comunicação de modo a caracterizar a sociedade da qual emerge o corpus deste estudo (LIPOVESTKY, 2004; SANTAELLA, 2012). A partir desse contexto, investigamos as obras literárias – O céu dos suicidas (2012), Divórcio (2013) e Delegado Tobias (2014) – e as narrativas midiáticas de Ricardo Lísias e identificamos nelas estratégias da publicidade.********************************************************************The novel by Ricardo Lísias: wide open windows to the subject hypermodernAbstract: Through the analysis of the novels of Ricardo Lísias and its self-critical production, this work intends to understand some relationships between the self-fiction literature and the popularization of the subject author immersed in the media universe. Starting from a literature review that conceptualizes the objects herein bounded and an earlier assessment of the literary production of young Brazilian writers selected by Granta magazine in 2012, we strengthened  ur focus on the novelist's movement toward the writing itself  nd self-reference. Pursuing this aim, we analyzed and contextualized the form of writing named autofiction, especially with regard to the similarities between instances of the narrator and the author and between biographema and fiction (FIGUEIREDO, 2013; KLINGER, 2012). We also evoked Sociology and Media Studies to characterize the society of which emerges the corpus of this study (LIPOVESTKY, 2004; SANTAELLA, 2012). From these premises, we investigated the literary works – Céu dos suicidas (Heaven suicide, 2012), Divórcio (Divorce, 2013) and Delegado Tobias (Tobias, the police chief, 2014) – and the media narratives of Ricardo Lísias and finally we identified his advertising strategies.Keywords: Self-ficction; Contemporary literature; Hypermodernity; Ricardo Lísias


2009 ◽  
Vol 14 (1) ◽  
pp. 1-12 ◽  
Author(s):  
Karen Lumsden

This article addresses the failure of studies concerning moral panics to take into account the reaction of those individuals who are the subject of social anxiety. It responds to the suggestion by McRobbie and Thornton (1995) that studies of moral panic need to account for the role played by the ‘folk devils’ themselves, for a moral panic is a collective process (Young, 2007). The paper presents findings from ethnographic fieldwork with the ‘boy racer’ culture in Aberdeen, qualitative interviews with members of outside groups, and content analysis of media articles. The societal reaction to the ‘boy racer’ subculture in Aberdeen is evidence of a contemporary moral panic. The media's representation of the subculture contributed to the stigmatization of young drivers and the labelling of the subculture's activities as deviant and antisocial. The drivers were aware of their negative portrayal in the media; however their attempts to change the myth of the ‘boy racer’ were unsuccessful. Although subcultural media can provide an outlet of self-expression for youths, these forms of media can also become caught-up in the moral panic. Ironically the youths’ own niche and micro media reified the (ir)rationality for the moral panic.


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