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RISS 인기검색어
- 검색키워드
- 저자 : Chenoweth, David M. (검색결과 5 건)
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Redefining Welfare: Australian Social Policy and Practice
Lesley Chenoweth 한국사회복지학회 2008 Asian Social Work and Policy Review Vol.2 No.1
The present paper outlines and analyzes Australia’s welfare reform policies as they have beenimplemented over the past decade. While there have been numerous social policy initiatives overthis period, welfare reform provides an interesting site for analysis and review. This suite of policiesand programs is of particular importance from several standpoints. First, its target groups – thoseneeding income security assistance, including the unemployed, people with disabilities, and singleparents – are historically and traditionally of concern to social work and social welfare. Second,welfare reform policies have had significant impact on social welfare agencies, and the social workersand welfare workers employed in them. Finally, welfare reform has had a wider impact oninequality in Australia and our attitudes to those in need. This paper first provides a brief overviewof the context of Australian social policy and welfare, its origins and current situation. It then outlinesthe key operational elements of welfare reform and how it has been implemented. The thirdsection of the paper offers a critical analysis of these policies and programs and finally poses somequestions and issues requiring further discussion and research.
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Shape changing thin films powered by DNA hybridization
Shim, Tae Soup,Estephan, Zaki G.,Qian, Zhaoxia,Prosser, Jacob H.,Lee, Su Yeon,Chenoweth, David M.,Lee, Daeyeon,Park, So-Jung,Crocker, John C. Nature Publishing Group, a division of Macmillan P 2017 Nature nanotechnology Vol.12 No.1
<P>Active materials that respond to physical(1-3) and chemical(4-6) stimuli can be used to build dynamic micromachines that lie at the interface between biological systems and engineered devices(7,8). In principle, the specific hybridization of DNA can be used to form a library of independent, chemically driven actuators for use in such microrobotic applications and could lead to device capabilities that are not possible with polymer- or metal-layer-based approaches. Here, we report shape changing films(9) that are powered by DNA strand exchange reactions with two different domains that can respond to distinct chemical signals. The films are formed from DNA-grafted gold nanoparticles(10,11) using a layer-by-layer deposition process. Films consisting of an active and a passive layer show rapid, reversible curling in response to stimulus DNA strands added to solution. Films consisting of two independently addressable active layers display a complex suite of repeatable transformations, involving eight mechanochemical states and incorporating self-righting behaviour.</P>
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Effects of bee venom treatment on growth performance of young pigs.
Han, Sang Mi,Lee, Kwang Gill,Yeo, Joo Hong,Hwang, Sung Jin,Jang, Chul Ho,Chenoweth, Peter J,Pak, Sok Cheon Institute for Advanced Research in Asian Science a 2009 The American journal of Chinese medicine Vol.37 No.2
<P>This study examined the effect of whole bee venom (BV) as a potential stimulant of the piglet immune system, on growth performance, blood parameters, plasma protein and immune globulin content of serum. Piglets (n = 97) received combinations of 0.5, 1.0, 1.5, 2.0 and 2.5 mg/kg of parenterally administered BV on 4 occasions between birth and Day 30. In the apipuncture group (n = 31), piglets were acupunctured with the worker honeybee. Two acupoints, GV-1 (Jiao-chao) and GV-20 (Bai-hui), were selected for apipuncture. All piglets (n = 128) in the treatment groups were treated 4 times throughout the study period of 60 days. The control piglets received no treatments. Blood was taken via jugular venipuncture on Day 30 after birth. Body weight and survivability were measured, and changes in hematological values were analyzed. Both the BV injection group and apipuncture group increased body weight and survivability by 26.6% and 21.8%, and 7.9% and 6.7% respectively compared to the controls. The numbers of leukocytes, erythrocytes, lymphocytes and monocytes were not influenced by treatments. However, a potential clinical benefit of high dose therapy was seen in increased populations of leukocytes, lymphocytes and monocytes compared with either the apipuncture or control groups. Other blood parameters such as total protein and albumin were not affected by treatment. However, IgG levels were generally higher in treated groups than in the controls. These findings indicate that BV might be useful to stimulate immuno-competence in pig production, possibly via the primary bioactive components of melittin, phospholipase A(2) and apamin. The administration of BV, either via injection or acupuncture, did not make any differences in growth performance of young pigs. These results would be useful for further purification and characterization of immune boosting agents from BV.</P>
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DNA Island Formation on Binary Block Copolymer Vesicles
Luo, Qingjie,Shi, Zheng,Zhang, Yitao,Chen, Xi-Jun,Han, Seo-Yeon,Baumgart, Tobias,Chenoweth, David M.,Park, So-Jung American Chemical Society 2016 JOURNAL OF THE AMERICAN CHEMICAL SOCIETY - Vol.138 No.32
<P>Here, we report DNA-induced polymer segregation and DNA island formation in binary block copolymer assemblies. A DNA diblock copolymer of polymethyl acrylateblock-DNA (PMA-b-DNA) and a triblock copolymer of poly(butadiene)-block-poly(ethylene oxide)-block-DNA (PBD-b-PEO-b-DNA) were synthesized, and each was coassembled with a prototypical amphiphilic polymer of poly(butadiene)-block-poly(ethylene oxide) (PBD-b-PEO). The binary self-assembly of PMA-b-DNA and PBD-b-PEO resulted in giant polymersomes with DNA uniformly distributed in the hydrophilic PEO shell. When giant polymersomes were connected through specific DNA interactions, DNA block copolymers migrated to the junction area, forming DNA islands within polymersomes. These results indicate that DNA hybridization can induce effective lateral polymer segregation in mixed polymer assemblies. The polymer segregation and local DNA enrichment have important implications in DNA melting properties, as mixed block copolymer assemblies with low DNA block copolymer contents can still exhibit useful DNA melting properties that are characteristic of DNA nanostructures with high DNA density.</P>
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