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Kyeong D, Kim M, Kwak M. Thermally Triggered Multilevel Diffractive Optical Elements Tailored by Shape-Memory Polymers for Temperature History Sensors. ACS Appl Mater Interfaces 2023; 15:9813-9819. [PMID: 36779629 DOI: 10.1021/acsami.2c18901] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
The morphological transitions induced by external stimuli in shape-memory polymers (SMPs) can be exploited with the real-time response of far-field diffraction patterns in diffractive optical elements (DOEs). In this paper, we combine the temperature characteristics of SMPs and the display characteristics of DOEs to obtain an optical temperature sensing film where the temperature information is taken as a change of far-field diffraction images. This process was achieved by imprinting the micropatterns of the DOEs on the epoxy-based SMP film, which can be programmed to hold a temporary optical image and revert to its original image upon exposure to a specific temperature. Furthermore, the specific temperature at which the image transformation occurs can be customized by varying the chain flexibility of the SMP. Based on a range of transition points, by imprinting the desired combination of SMP-DOEs on a film, a sensor that can record and inform the temperature history is demonstrated. As for the feasible application of this technique, it can be used for the compact and reliable optical temperature indicators, which can be applied in temperature-sensitive industries such as food and pharmaceuticals.
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Affiliation(s)
- Dokyung Kyeong
- Department of Mechanical Engineering, Kyungpook National University, Daegu 41566, Korea
| | - Minsu Kim
- Department of Mechanical Engineering, Kyungpook National University, Daegu 41566, Korea
| | - Moonkyu Kwak
- Department of Mechanical Engineering, Kyungpook National University, Daegu 41566, Korea
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Kwak M, Mehaffey JH, Hsu A, Hawkins RB, Schirmer B, Hallowell PT. Discussion on: Bariatric surgery is associated with reduction in non-alcoholic steatohepatitis and hepatocellular carcinoma: A propensity matched analysis. Am J Surg 2020; 219:508. [PMID: 32037049 DOI: 10.1016/j.amjsurg.2019.11.001] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Kwak M, Kim J, Sung K, Whang K. PSX-31 Effects of Dietary Non-starch Polysaccharide (NSP) and NSP-Degrading Enzyme Complex (Endo-PowerTM) Supplementation on Growth Performance, Intestinal Environments and Systemic Immune Responses in Growing Pigs. J Anim Sci 2018. [DOI: 10.1093/jas/sky404.1065] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Affiliation(s)
- M Kwak
- Department of Biotechnology, Graduate School, Korea University,Seoul, Republic of Korea
| | - J Kim
- Department of Biotechnology, Graduate School, Korea University,Seoul, Korea,Seoul, South Korea
| | - K Sung
- EASY BIO Inc.,Seoul, South Korea
| | - K Whang
- Department of Biotechnology, Graduate School, Korea University,Seoul, Korea,Seoul, South Korea
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Choi S, Park M, Kwak M, Lee J, Whang K. 157 ValiMP, a mixture of phytogenic compounds with manganese, reduces abdominal fat in broilers. J Anim Sci 2018. [DOI: 10.1093/jas/sky404.637] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- S Choi
- Korea University,Seoul, South Korea
| | - M Park
- Korea University,Seoul, South Korea
| | - M Kwak
- Department of Biotechnology, Graduate School, Korea University,Seoul, Korea, Seoul, South Korea
| | - J Lee
- Korea University,Seoul, South Korea
| | - K Whang
- Department of Biotechnology, Graduate School, Korea University,Seoul, Korea, Seoul, South Korea
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Shin O, Park S, Kwak M, Kang J. THE PROFILES OF VULNERABILITIES AMONG RETIREES IN U.S.A. Innov Aging 2018. [DOI: 10.1093/geroni/igy031.3713] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- O Shin
- University of Illinois at Urbana Champaign
| | - S Park
- Washington University in Saint Louis
| | - M Kwak
- . Chinese University of Hong Kong
| | - J Kang
- West Coast Poverty Center
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Kwak M, Kim J, Hwang IH, Whang KY. 1003 Effects of dietary lysophospholipids (LipidolTM) on intestinal morphology and gene expression of inflammatory cytokines in weaned rats. J Anim Sci 2016. [DOI: 10.2527/jam2016-1003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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7
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Kwak M, Kim J, Lee JM, Jung SW, Whang KY. 0977 A protective effect of IGF-activated plasma protein (CTCgrow) on lipopolysaccharide-induced intestinal dystrophy in rats. J Anim Sci 2016. [DOI: 10.2527/jam2016-0977] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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8
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Hong JK, Lim J, Lee BY, Kwak M. Isolation and characterization of novel microsatellites for Abies koreana and A. nephrolepis (Pinaceae). Genet Mol Res 2016; 15:gmr7542. [PMID: 27173282 DOI: 10.4238/gmr.15027542] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
Abies koreana is an endemic and rare species from Korea and is classified as endangered by the International Union for Conservation of Nature. Although the genetic diversity assessment for current population of A. koreana needs to be performed urgently, no microsatellite markers have been developed for this species. In the present study, we developed 22 novel polymorphic microsatellite loci and the characteristics of these loci were determined in A. koreana as well as in Abies nephrolepis, the most closely related species, and these loci were compared with previously reported microsatellite markers developed for the Abies genus. Genomic sequence (161 Mbp; 325,776 reads) was obtained from one individual of A. koreana using Roche 454 GS-FLX Titanium sequencing and 19,258 repeat motifs were identified from it. A total of 288 primer pairs with high copy numbers of di-repeat motifs were evaluated for amplification in A. koreana and A. nephrolepis. A total of 71 primer pairs successfully amplified fragments, of which 22 showed polymorphisms in A. koreana and A. nephrolepis. The average expected diversity was 0.767 and 0.717 in A. koreana and A. nephrolepis, respectively; these heterozygosity levels were moderate compared to the previously reported microsatellite loci from Abies species. This is the first set of microsatellite markers developed for A. koreana as well as A. nephrolepis and further population genetic studies of both species and genetic delimitation can be carried out for the species conservation and management.
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Affiliation(s)
- J K Hong
- Plant Resources Division, National Institute of Biological Resources, Incheon, Korea
| | - J Lim
- Plant Resources Division, National Institute of Biological Resources, Incheon, Korea
| | - B Y Lee
- Plant Resources Division, National Institute of Biological Resources, Incheon, Korea
| | - M Kwak
- Plant Resources Division, National Institute of Biological Resources, Incheon, Korea
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Abstract
Salivary glands have an essential secretory function for maintaining oral and overall health. The epithelial compartment of the gland is composed of several highly specialized cell types that cooperate to secrete and deliver saliva to the oral cavity. The mouse submandibular gland has been used as a model for major salivary glands in human. The secretory complex in this model is composed of 2 secretory compartments, including acini and granular ducts connected by intercalated ducts. Contractile myoepithelial cells surround the secretory complex to facilitate salivary flow. Whether differentiated cells in the secretory complex are maintained by self-duplication or contribution from stem cells has remained an open question. Here, in analyzing the expression of basal cytokeratin (K) 14 in the secretory complex, we discovered a subset of K14(+) ductal cells in the intercalated ducts of the adult gland. These cells are distinct from the K14-expressing basal/myoepithelial cells, proliferate at a significantly higher rate than any other epithelial cell type in the gland, and reside in a spatially defined domain within the intercalated duct. Using inducible genetic lineage tracing, we show that K14(+) ductal cells represent a long-lived yet cycling population of stem cells that are established during development and contribute to the formation and maintenance of the granular ducts throughout life. Our data provide direct evidence for the existence of stem cells contributing to homeostasis of salivary glands, as well as new insights into glandular pathobiology.
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Affiliation(s)
- M Kwak
- Department of Oral Biology and Pathology, Stony Brook University, Stony Brook, NY, USA
| | - N Alston
- Department of Oral Biology and Pathology, Stony Brook University, Stony Brook, NY, USA
| | - S Ghazizadeh
- Department of Oral Biology and Pathology, Stony Brook University, Stony Brook, NY, USA
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Kwak M, Ingersoll-Dayton B, Burgard S. Receipt of Care and Depressive Symptoms in Later Life: The Importance of Self-Perceptions of Aging. J Gerontol B Psychol Sci Soc Sci 2014; 69:325-35. [DOI: 10.1093/geronb/gbt128] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Ahn EH, Kim Y, Kshitiz, An SS, Afzal J, Lee S, Kwak M, Suh KY, Kim DH, Levchenko A. Spatial control of adult stem cell fate using nanotopographic cues. Biomaterials 2013; 35:2401-2410. [PMID: 24388388 DOI: 10.1016/j.biomaterials.2013.11.037] [Citation(s) in RCA: 86] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2013] [Accepted: 11/14/2013] [Indexed: 12/14/2022]
Abstract
Adult stem cells hold great promise as a source of diverse terminally differentiated cell types for tissue engineering applications. However, due to the complexity of chemical and mechanical cues specifying differentiation outcomes, development of arbitrarily complex geometric and structural arrangements of cells, adopting multiple fates from the same initial stem cell population, has been difficult. Here, we show that the topography of the cell adhesion substratum can be an instructive cue to adult stem cells and topographical variations can strongly bias the differentiation outcome of the cells towards adipocyte or osteocyte fates. Switches in cell fate decision from adipogenic to osteogenic lineages were accompanied by changes in cytoskeletal stiffness, spanning a considerable range in the cell softness/rigidity spectrum. Our findings suggest that human mesenchymal stem cells (hMSC) can respond to the varying density of nanotopographical cues by regulating their internal cytoskeletal network and use these mechanical changes to guide them toward making cell fate decisions. We used this finding to design a complex two-dimensional pattern of co-localized cells preferentially adopting two alternative fates, thus paving the road for designing and building more complex tissue constructs with diverse biomedical applications.
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Affiliation(s)
- Eun Hyun Ahn
- Department of Pathology, University of Washington, Seattle, WA.,Department of Pathology, University of Washington, Seattle, WA
| | - Younghoon Kim
- Department of Chemical Engineering, Johns Hopkins University, Baltimore, MD
| | - Kshitiz
- Department of Bioengineering, University of Washington, Seattle, WA.,Department of Biomedical Engineering, Johns Hopkins University, Baltimore, MD
| | - Steven S An
- Department of Environmental Health Sciences, Johns Hopkins University, Baltimore, MD.,Physical Sciences in Oncology Center, Johns Hopkins University, Baltimore, MD.,In Vivo Cellular and Molecular Imaging Center, Johns Hopkins University School of Medicine, Baltimore, MD
| | - Junaid Afzal
- Department of Medicine, The Johns Hopkins Medical Institutions, Baltimore, MD
| | - Suengwon Lee
- Department of Environmental Health Sciences, Johns Hopkins University, Baltimore, MD
| | - Moonkyu Kwak
- Department of Mechanical and Aerospace Engineering, Seoul National University, Seoul, Republic of Korea
| | - Kahp-Yang Suh
- Department of Mechanical and Aerospace Engineering, Seoul National University, Seoul, Republic of Korea
| | - Deok-Ho Kim
- Institute of Stem Cell and Regenerative Medicine, University of Washington, Seattle, WA.,Department of Bioengineering, University of Washington, Seattle, WA
| | - Andre Levchenko
- Department of Biomedical Engineering, Johns Hopkins University, Baltimore, MD
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Keller R, Kwak M, de Vries JW, Sawaryn C, Wang J, Anaya M, Müllen K, Butt HJ, Herrmann A, Berger R. Properties of amphiphilic oligonucleotide films at the air/water interface and after film transfer. Colloids Surf B Biointerfaces 2013; 111:439-45. [PMID: 23859875 DOI: 10.1016/j.colsurfb.2013.06.022] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2012] [Revised: 06/11/2013] [Accepted: 06/12/2013] [Indexed: 10/26/2022]
Abstract
The self-assembly of amphiphilic hybrid materials containing an oligonucleotide sequence at the air/water interface was investigated by means of pressure-molecular area (Π-A) isotherms. In addition, films were transferred onto solid substrates and imaged using scanning force microscopy. We used oligonucleotide molecules with lipid tails, which consisted of a single stranded oligonucleotide 11 mer containing two hydrophobically modified 5-(dodec-1-ynyl)uracil nucleobases (dU11) at the 5'-end of the oligonucleotide sequence. The air/water interface was used as confinement for the self-assembling process of dU11. Scanning force microscopy of films transferred via Langmuir-Blodgett technique revealed mono-, bi- (Π ≥ 2 mN/m) and multilayer formation (Π ≥ 30 mN/m). The first layer was 1.6 ± 0.1 nm thick. It was oriented with the hydrophilic oligonucleotide moiety facing the hydrophilic substrate while the hydrophobic alkyl chains faced air. In the second layer the oligonucleotide moiety was found to face the air. The second layer was found to cover up to 95% of the sample area. Our measurements indicated that the rearrangement of the molecules into bi- and multiple bilayers happened already at the air/water interface. Similar results were obtained with a second type of oligonucleotide amphiphile, an oligonucleotide block copolymer, which was composed of an oligonucleotide 11 mer covalently attached at the terminus to polypropyleneoxide (PPO).
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Affiliation(s)
- R Keller
- Max Planck Institute for Polymer Research, 55128 Mainz, Germany
| | - M Kwak
- Department of Polymer Chemistry, Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands
| | - J W de Vries
- Department of Polymer Chemistry, Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands
| | - C Sawaryn
- Max Planck Institute for Polymer Research, 55128 Mainz, Germany
| | - J Wang
- Max Planck Institute for Polymer Research, 55128 Mainz, Germany
| | - M Anaya
- Max Planck Institute for Polymer Research, 55128 Mainz, Germany
| | - K Müllen
- Max Planck Institute for Polymer Research, 55128 Mainz, Germany
| | - H-J Butt
- Max Planck Institute for Polymer Research, 55128 Mainz, Germany
| | - A Herrmann
- Department of Polymer Chemistry, Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands
| | - R Berger
- Max Planck Institute for Polymer Research, 55128 Mainz, Germany.
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O M, Seo D, Kwak M, Shin J. 56 Serum Procalcitonin and C-reactive Protein Level as a Early Diagnostic Marker of Bacterial Meningitis in the Emergency Department. Ann Emerg Med 2012. [DOI: 10.1016/j.annemergmed.2012.06.335] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Abstract
ABSTRACTWe investigated continuous fabrication of a large area 2-D metamaterial comprising a metal dot array on a dielectric coated substrate. We demonstrated patterning of metal dots arrays of varying patterns and shapes with diameter of about 2.5 μm and metal-to-metal spacing from 0.3 to 2.5 μm using a nano-imprinting stamp on a roller. The pattern was first fabricated on a standard photolithography mask, reproduced onto a silicon wafer master mold, and then transferred to a flexible polymer mold that was wrapped around a metal roller. The method was used to pattern a thin Al layer on top of SiO2 on a flexible polymer substrate. The aluminum was coated with a resist and the roller moved over the substrate with adjustable speed and pressure to imprint the fine pattern into the resist. The resist was cured, and a very thin layer of residual resist was removed by RIE, followed by a standard etching treatment for patterning the aluminum layer.The as-etched pattern had very few defects and the optical properties of the metamaterial were excellent and correlated well with simulations. This work has shown that low cost, rapid roll-to-roll processing of 2-D metamaterial structures is possible.
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Repinski SL, Kwak M, Gepts P. The common bean growth habit gene PvTFL1y is a functional homolog of Arabidopsis TFL1. Theor Appl Genet 2012; 124:1539-47. [PMID: 22331140 DOI: 10.1007/s00122-012-1808-8] [Citation(s) in RCA: 90] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/25/2011] [Accepted: 01/26/2012] [Indexed: 05/18/2023]
Abstract
In a common bean plant exhibiting determinate growth, the terminal shoot meristem switches from a vegetative to reproductive state, resulting in a terminal inflorescence. Contrary to this, indeterminate growth habit results in a terminal meristem that remains vegetative where it further regulates the production of lateral vegetative and reproductive growth. In the last century, breeders have selected determinate growth habit, in combination with photoperiod insensitivity, to obtain varieties with a shorter flowering period, earlier maturation and ease of mechanized harvest. Previous work has identified TFL1 as a gene controlling determinate growth habit in Arabidopsis thaliana. In this work, we have validated that the Phaseolus vulgaris candidate gene, PvTFL1y, is the functional homolog of TFL1 using three independent lines of evidence. First, in a population of ~1,500 plants, PvTFL1y was found to co-segregate with the phenotypic locus for determinate growth habit (fin) on chromosome 01. Second, using quantitative PCR, we found that two unique haplotypes associated with determinacy at the PvTFL1y locus, a 4.1-kb retrotransposon and a splice-site mutation, cause mRNA abundance to decrease 20-133 fold, consistent with the recessive nature of fin. Finally, using a functional complementation approach, through Agrobacterium-mediated transformation of determinate Arabidopsis, we rescued tfl1-1 mutants with the wild-type PvTFL1y gene. Together, these three lines of evidence lead to the conclusion that PvTFL1y is the functional homolog of the Arabidopsis gene, TFL1, and is the gene responsible for naturally occurring variation for determinacy in common bean. Further work exploring the different haplotypes at the PvTFL1y locus may lead to improved plant architecture and phenology of common bean cultivars.
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Affiliation(s)
- S L Repinski
- Department of Plant Sciences/MS1, University of California, 1 Shields Avenue, Davis, CA 95616-8780, USA
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Scully B, Erskine K, Fan C, Durst C, Kwak M, Barzilla J, Grande-Allen K, Morales D. Matrix Degradation of a Small Intestinal Submucosa Patch Seeded with Mitral Valve Interstitial Cells Facilitates Tissue Remodeling: An In Vitro Study with a Novel Bioreactor. J Surg Res 2011. [DOI: 10.1016/j.jss.2010.11.869] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Schiller P, Kwak M. The integration of visual and auditory cues for express saccade generation. J Vis 2010. [DOI: 10.1167/10.7.505] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
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18
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Yoffie DB, Kwak M. Playing by the rules. How Intel avoids antitrust litigation. Harv Bus Rev 2001; 79:119-148. [PMID: 11408972] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Microsoft and Intel are both obvious targets for antitrust litigation; both wield considerable control in their respective segments of the computer industry. But while Mircrosoft has been mired in court for years now--its name and business practices dragged through the mud, and its very future as a single company thrown into doubt--Intel has avoided a prolonged, high-profile antitrust case. Intel's success is not a matter of luck. The company's antitrust compliance program, refined over many years, has been an integral element in the chip maker's business strategy. In this article, the authors suggest that Intel's approach to compliance provides a valuable model for any enterprise that may come under regulators' scrutiny. They describe how Intel created extremely conservative antitrust compliance standards and then instituted a series of unique training events that had active support from then--CEO Andy Grove and others in senior management. First, live training -- not just instructional pamphlets or videos -- was given to all affected employees. Those classes were followed by customized training programs for different parts of the company. Then, to drive antitrust awareness deeper into the company's memory, Intel carried out random audits of employees' files and conducted mock depositions. "It's fascinating to see," Grove says. "A memo is introduced into evidence and you shrug. You fully understand how that memo could be written. Moreover, you could have written it yourself. And then you see that memo turned into a tool and a weapon against you, in front of your eyes." Intel recognizes that no matter how cautious it is, it will always face extraordinary scrutiny as a market leader. But "since antitrust is embedded in everything we do," Grove says, "we can control our destiny."
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Abstract
A DNA probe derived from a human genomic library has been used to localize on human chromosomes a gene coding for the alpha-subunit of the brain type II sodium channel (SCN2A). Hybridization of the probe to Southern blots made with DNAs from a rodent-human somatic cell hybrid panel indicates localization to the long arm of human chromosome 2. In situ hybridization to metaphase chromosomes confirms this assignment and indicates regional localization to 2q21-q33. The probe also reveals a frequent two-allele HaeIII RFLP.
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Affiliation(s)
- M Litt
- Department of Biochemistry, Oregon Health Sciences University, Portland 97201
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