Homogenized elastic properties of graphene for moderate deformations

Marenic, Eduard,Ibrahimbegovic, Adnan Techno-Press 2015 Coupled systems mechanics Vol.4 No.2

This paper presents a simple procedure to obtain a substitute, homogenized mechanical response of single layer graphene sheet. The procedure is based on the judicious combination of molecular mechanics simulation results and homogenization method. Moreover, a series of virtual experiments are performed on the representative graphene lattice. Following these results, the constitutive model development is based on the well-established continuum mechanics framework, that is, the non-linear membrane theory which includes the hyperelastic model in terms of principal stretches. A proof-of-concept and performance is shown on a simple model problem where the hyperelastic strain energy density function is chosen in polynomial form.

독일 공급망 실사법의 의미와 한계

Maren Leifker 한국노동연구원 2021 국제노동브리프 Vol.19 No.11

A GREEN REPUTATION OR MARKET LEADERSHIP? THE ROLE OF CORPORATE ABILITY AND CORPORATE SOCIAL RESPONSIBILITY IN SUSTAINABLE MARKETING

Maren Vos,Jos Bartels 글로벌지식마케팅경영학회 2014 Global Marketing Conference Vol.2014 No.7

Consumers are increasingly willing to consider ethical aspects in their buying decisions, while organizations strategically respond to consumer needs in this respect by focusing on their ethical reputation in their branding strategies (Singh et al., 2012). Moreover, brands are increasingly switching to natural ingredients in their products or adding an organic option to their current product line (Johri & Sahasakmontri, 1998; Prothero & McDonagh, 1992; Todd, 2004). Although the majority of the growth of green and ethical products is found within the organic food (Organic Monitor, 2011; Willer & Kilcher, 2010) and fair trade products (FLO, 2011) categories, there also seems to be constant growth in the demand for organic personal care products (PCPs) (Smitson, 2006). In contrast, scientific research on organic Personal Care Products (PCPs) seems to be scarce (Kim & Chung, 2011). The current study investigates the effect of brand associations on consumer perceptions considering organic PCPs. More specifically, we focus on the role of corporate ability (CA) versus corporate social responsibility (CSR) associations in brand equity (Yoo et al., 2000) and brand trust (Chaudhuri & Holbrook, 2001) perceptions. To test the effects of CA and CSR associations on consumer brand equity and trust, we first conducted a pretest, in which we included brands with the highest market share in the Dutch PCP market (Nielsen Market Analytics, April 2013). Based on the results of the pretest the following brands were selected for the main study: L’Oréal, Rituals and Palmolive. For the main experiment respondents were randomly assigned to one of the three conditions in a between-subjects design: L’Oréal (N=42), Palmolive (N=42) and Rituals (N=37). Based on the results of the experiment we can draw the following conclusions. Brands may be associated with both CA and CSR characteristics. Even though possible benefits induced by introducing an organic PCP are higher for brands that are currently associated with CSR, other brands may benefit still from introducing an organic PCP, as the effects of CSR associations and an organic product launch merely seem to be complementary. When a brand considers the introduction of a green variant of its current PCP line, the brand does not seem to need a specific “green” reputation or image. More important, the producing company behind the brand should communicate its innovative characteristics as a market leader as well as a sense of responsibility toward the environment and society. Combining CA with CSR characteristics seems to be the most profitable strategy for attracting more consumers than one’s competitors. Although one should constantly aim to remain competitive in the market, the overall effects of sustainable initiatives will be much lower for brands with a weaker reputation in general than for brands that already induce multiple positive associations. In sum, an organization that decides to introduce a new organic product should be aware of the strong positive associations of their current brands on a variety of product characteristics. In the end, investing in improving multiple positive associations instead of focusing on either CSR or CA will be the most profitable strategy.

What’s in a name? Monophyly of genera in the red algae: Rhodophyllis parasitica sp. nov. (Gigartinales, Rhodophyta); a new red algal parasite from New Zealand

Maren Preuss,Giuseppe C. Zuccarello 한국조류학회I 2014 ALGAE Vol.29 No.4

Red algal parasites are common within red algae and are mostly closely related to their hosts, but have a reduced habit. In the past, red algal parasites, due to their reduced morphology, have been given distinct generic names, even though they are often phylogenetically nested in their host’s genus. This is a problem nomenclaturally for maintenance of a taxonomy based on monophyly. This study investigates the morphology, genetic variation and distribution of an undescribed red algal parasite growing on its host Rhodophyllis membranacea, widely distributed throughout New Zealand. Microscopy, molecular markers (plastid, mitochondrial, nuclear), and herbarium investigation were used to investigate this species. The parasite is widely distributed throughout New Zealand. All molecular markers clearly show that the parasite is almost identical to the host, even though morphologically quite distinct from members of the host genus. We believe that to maintain monophyly of Rhodophyllis the parasite should be described as a new species of Rhodophyllis, Rhodophyllis parasitica sp. nov. We also recommend that in order to maintain generic monophyly most red algal parasite genera should also be transferred to their host genus.

A GREEN REPUTATION OR MARKET LEADERSHIP? THE ROLE OF CORPORATE ABILITY AND CORPORATE SOCIAL RESPONSIBILITY IN SUSTAINABLE MARKETING

Maren Vos,Jos Bartels 글로벌지식마케팅경영학회 2014 Global Marketing Conference Vol.2014 No.7

Consumers are increasingly willing to consider ethical aspects in their buying decisions, while organizations strategically respond to consumer needs in this respect by focusing on their ethical reputation in their branding strategies (Singh et al., 2012). Moreover, brands are increasingly switching to natural ingredients in their products or adding an organic option to their current product line (Johri & Sahasakmontri, 1998; Prothero & McDonagh, 1992; Todd, 2004). Although the majority of the growth of green and ethical products is found within the organic food (Organic Monitor, 2011; Willer & Kilcher, 2010) and fair trade products (FLO, 2011) categories, there also seems to be constant growth in the demand for organic personal care products (PCPs) (Smitson, 2006). In contrast, scientific research on organic Personal Care Products (PCPs) seems to be scarce (Kim & Chung, 2011). The current study investigates the effect of brand associations on consumer perceptions considering organic PCPs. More specifically, we focus on the role of corporate ability (CA) versus corporate social responsibility (CSR) associations in brand equity (Yoo et al., 2000) and brand trust (Chaudhuri & Holbrook, 2001) perceptions. To test the effects of CA and CSR associations on consumer brand equity and trust, we first conducted a pretest, in which we included brands with the highest market share in the Dutch PCP market (Nielsen Market Analytics, April 2013). Based on the results of the pretest the following brands were selected for the main study: L’Or?al, Rituals and Palmolive. For the main experiment respondents were randomly assigned to one of the three conditions in a between-subjects design: L’Or?al (N=42), Palmolive (N=42) and Rituals (N=37). Based on the results of the experiment we can draw the following conclusions. Brands may be associated with both CA and CSR characteristics. Even though possible benefits induced by introducing an organic PCP are higher for brands that are currently associated with CSR, other brands may benefit still from introducing an organic PCP, as the effects of CSR associations and an organic product launch merely seem to be complementary. When a brand considers the introduction of a green variant of its current PCP line, the brand does not seem to need a specific “green” reputation or image. More important, the producing company behind the brand should communicate its innovative characteristics as a market leader as well as a sense of responsibility toward the environment and society. Combining CA with CSR characteristics seems to be the most profitable strategy for attracting more consumers than one’s competitors. Although one should constantly aim to remain competitive in the market, the overall effects of sustainable initiatives will be much lower for brands with a weaker reputation in general than for brands that already induce multiple positive associations. In sum, an organization that decides to introduce a new organic product should be aware of the strong positive associations of their current brands on a variety of product characteristics. In the end, investing in improving multiple positive associations instead of focusing on either CSR or CA will be the most profitable strategy.

Literary Negotiations in Contemporary Zainichi Korean Literature: Zainichi Korean Postcoloniality and its Entanglement with Global History

Maren Haufs-Brusberg 서울대학교 규장각한국학연구원 2023 Seoul journal of Korean studies Vol.36 No.2

Zainichi Korean literature, which addresses questions concerning the Zainichi Korean minority, can be considered as one among many postcolonial literatures. By examining works of Sagisawa Megumu, Kaneshiro Kazuki, and Kim Masumi as case studies, I position contemporary Zainichi Korean literature within the broader context of postcolonial global history. Sagisawa’s novel Saihate no futari (Two persons at the margins, 1999) narrates the relationship between a Japanese woman, whose father is an American GI, and a Zainichi Korean man. After the man succumbs to leukemia, the woman discovers that his mother was a survivor of the atomic bomb. The silencing of his mother’s voice can be analyzed using Spivak’s concept of the subaltern. Kaneshiro’s novel GO (2000) addresses Korea’s division as a consequence of imperialism and the Cold War. Furthermore, it draws connections between African Americans in the United States and the Zainichi Korean minority, which can be interpreted as an allusion to Bhabha’s concept of mimicry. In Kim Masumi’s novel Nason no sora (The sky of Nason, 2001), a Zainichi Korean woman residing in the United States engages with both the Japanese expatriate community and Asian Americans, contending with essentialist concepts of ethnicity. I argue that in the selected novels both the literary negotiations of Zainichi Korean postcoloniality and its entanglement with global history as well as the references to other diasporas, namely, the Asian and African diasporas in the United States, contribute to a subversive reframing of some prevailing narratives concerning the Zainichi Korean minority in Japan.

What's in a name? Monophyly of genera in the red algae: Rhodophyllis parasitica sp. nov. (Gigartinales, Rhodophyta); a new red algal parasite from New Zealand

Preuss, Maren,Zuccarello, Giuseppe C. The Korean Society of Phycology 2014 ALGAE Vol.29 No.4

Red algal parasites are common within red algae and are mostly closely related to their hosts, but have a reduced habit. In the past, red algal parasites, due to their reduced morphology, have been given distinct generic names, even though they are often phylogenetically nested in their host's genus. This is a problem nomenclaturally for maintenance of a taxonomy based on monophyly. This study investigates the morphology, genetic variation and distribution of an undescribed red algal parasite growing on its host Rhodophyllis membranacea, widely distributed throughout New Zealand. Microscopy, molecular markers (plastid, mitochondrial, nuclear), and herbarium investigation were used to investigate this species. The parasite is widely distributed throughout New Zealand. All molecular markers clearly show that the parasite is almost identical to the host, even though morphologically quite distinct from members of the host genus. We believe that to maintain monophyly of Rhodophyllis the parasite should be described as a new species of Rhodophyllis, Rhodophyllis parasitica sp. nov. We also recommend that in order to maintain generic monophyly most red algal parasite genera should also be transferred to their host genus.

Aptamer-based Depletion of Small Molecular Contaminants: A Case Study Using Ochratoxin A

Emilia Schax,Maren Lönne,Thomas Scheper,Shimshon Belkin,Johanna-Gabriela Walter 한국생물공학회 2015 Biotechnology and Bioprocess Engineering Vol.20 No.6

Based on the increasing demand for detection and depletion of small molecules like mycotoxins or pesticides in food, water, or pharmaceuticals, aptamers are gaining more importance as sensitive, specific-depletion molecules. Here, we present an aptamer-based method for depletion of ochratoxin A (OTA) as a model system and show the advantages and the limitations of aptamers in the depletion of small molecular contaminants. OTA is a mycotoxin produced by various Penicillium and Aspergillus strains and is often found in grain and grain derivatives. We immobilized a well-described DNA aptamer against OTA on an agarose gel and used the column as a clean-up system. The aptamer shows a high specificity and sensitivity for OTA: Ochratoxin B, a molecule similar to OTA, was not bound by the aptamer; and a control oligonucleotide was not able to bind OTA. After optimizing the process for better economic feasibility, the column could be used for several times without loss of aptamer activity. We investigated the location of immobilized aptamer within the gel using fluorescent-labeled aptamers. Furthermore, beer samples spiked with OTA were used to investigate aptamer activity in complex samples. Using these complex samples we have observed a significant loss of aptamer activity. We have further investigated this limitation by performing microscale thermophoresis experiments to determine the KD values of the aptamer in different complex samples like beer, coffee, juice and wine. Our results indicate that the applicability of aptamers to real processes is currently restricted by the selection buffer used during its selection process (SELEX). We therefore suggest using conditions closer to those of the later application of the aptamer during future SELEX experiments.

BROAD H<i>β</i>EMISSION-LINE VARIABILITY IN A SAMPLE OF 102 LOCAL ACTIVE GALAXIES

Runco, Jordan N.,Cosens, Maren,Bennert, Vardha N.,Scott, Bryan,Komossa, S.,Malkan, Matthew A.,Lazarova, Mariana S.,Auger, Matthew W.,Treu, Tommaso,Park, Daeseong American Astronomical Society 2016 The Astrophysical journal Vol.821 No.1

<P>A sample of 102 local (0.02 <= z <= 0.1) Seyfert galaxies with black hole masses M-BH > 10(7)M(circle dot) was selected from the Sloan Digital Sky Survey (SDSS) and observed using the Keck 10 m telescope to study the scaling relations between M-BH and host galaxy properties. We study profile changes of the broad H beta emission line within the three to nine year time frame between the two sets of spectra. The variability of the broad H beta emission line is of particular interest, not only because it is used to estimate M-BH, but also because its strength and width are used to classify Seyfert galaxies into different types. At least some form of broad-line variability (in either width or flux) is observed in the majority (similar to 66%) of the objects, resulting in a Seyfert-type change for similar to 38% of the objects, likely driven by variable accretion and/or obscuration. The broad H beta line virtually disappears in 3/102 (similar to 3%) extreme cases. We discuss potential causes for these changing look active galactic nuclei. While similar dramatic transitions have previously been reported in the literature, either on a case-by-case basis or in larger samples focusing on quasars at higher redshifts, our study provides statistical information on the frequency of H beta line variability in a sample of low-redshift Seyfert galaxies.</P>

Arabidopsis thaliana as Bioindicator of Fungal VOCs in Indoor Air

( Samantha Lee ),( Richard Hung ),( Guohua Yin ),( Maren A. Klich ),( Casey Grimm ),( Joan W. Bennett ) 한국균학회 2016 Mycobiology Vol.44 No.3

In this paper, we demonstrate the ability of Arabidopsis thaliana to detect different mixtures of volatile organic compounds (VOCs) emitted by the common indoor fungus, Aspergillus versicolor, and demonstrate the potential usage of the plant as a bioindicator to monitor fungal VOCs in indoor air. We evaluated the volatile production of Aspergillus versicolor strains SRRC 108 (NRRL 3449) and SRRC 2559 (ATCC 32662) grown on nutrient rich fungal medium, and grown under conditions to mimic the substrate encountered in the built environment where fungi would typically grow indoors (moist wallboard and ceiling tiles). Using headspace solid phase microextraction/gas chromatography-mass spectrometry, we analyzed VOC profiles of the two strains. The most abundant compound produced by both strains on all three media was 1-octen-3-ol. Strain SRRC 2559 made several terpenes not detected from strain SRRC 108. Using a split-plate bioassay, we grew Arabidopsis thaliana in a shared atmosphere with VOCs from the two strains of Aspergillus versicolor grown on yeast extract sucrose medium. The VOCs emitted by SRRC 2559 had an adverse impact on seed germination and plant growth. Chemical standards of individual VOCs from the Aspergillus versicolor mixture (2-methyl-1-butanol, 3-methyl-1-butanol, 1-octen-3-ol, limonene, and β-farnesene), and β- caryophyllene were tested one by one in seed germination and vegetative plant growth assays. The most inhibitory compound to both seed germination and plant growth was 1-octen-3-ol. Our data suggest that Arabidopsis is a useful model for monitoring indoor air quality as it is sensitive to naturally emitted fungal volatile mixtures as well as to chemical standards of individual compounds, and it exhibits relatively quick concentration- and duration-dependent responses.