The Development of Polydimethysiloxane/ZnO–GO Antifouling Coatings

The development of antifouling coating for sensor is desirable because the biofilm can shorten sensor’s life and cause inaccurate reading. In this study, a facile one-pot reaction was used to synthesized ZnO–graphene oxide (GO) (ZnO–GO) nanocomposites. Different amount of ZnO–GO was incorporated in the polydimethylsiloxane (PDMS) matrix respectively though a simple solution mixing method, in order to create PDMS/ZnO–GO nanocomposite (PZGO). The coating was obtained directly by spin coating of PZGO/tetrahydrofuran suspension. The hydrophobicity, surface roughness (Ra), surface free-energy (SFE) and nanoscale structure were investigated as antifouling factors. Antifouling tests were performed using two marine microorganisms, the cyanobacterium Synechococcus sp. Strain PCC 7002 and the diatom Phaeodactylum tricornutum. PZGO0.2 (mass ratio of ZnO–GO to PDMS: 0.2 wt%) displayed excellent antifouling property with 8.5% of Synechococcus sp. Strain PCC 7002 biofilm coverage, while PZGO0.1 (mass ratio of ZnO–GO to PDMS: 0.1 wt%) showed 2.4% P. tricornutum biofilm coverage. The antifouling property of the synthesized PZGO nanocomposite can be attributed to its high Ra and hydrophobicity which was caused by the good dispersion of ZnO–GO in PDMS matrix. This study suggests a potential of PZGO nanocomposite for sensor’s antifouling coating, which could contribute to improve sensor’s durability relating to biofouling in future. Graphic Abstract

Miłosne nieporozumienia w świetle teorii umysłu, na materiale wczesnej prozy Antoniego Czechowa

Любовные недоразумения с точки зрения теории разума, на материале раннего творчества Антона Чехова В настоящей статье обращаемся к одной из главных тем чеховедения последних лет, т.е. к теме коммуникации. Для Чехова коммуникация является не только простым обменом мнений, но сама становится предметом интереса и тщательных наблюдений. Оттуда возникает вполне реалистический – учитывающий разные ошибки – образ человеческого общения в прозе Чехова, который, в свою очередь, поддается анализу с учетом разных методов. Мы предлагаем посмотреть на проблему недоразумений героев (в области любви) с точки зрения ошибочной теории разума. Мы присматриваемся нескольким текстам раннего творчества писателя (м.проч. Нервы, Верочка), в которых недоразумения являются эффектом именно неправильного понимания чужого сознания, эмоций и чувств. Чехов, таким образом, создал настоящий образ человеческой коммуникации, в которой язык является лишь одним из многих явлений, решающих о успехе в межчеловеческом общении. Love misunderstanding in the light of theory of mind, based on Anton Chekhov’s early prose In this article we endeavour to draw the attention to one of the most essential themes in the research on Chekhov’s literary works, being the problem of communication. For Chekhov communication is not only a simple exchange of points, but it itself becomes the matter of interest and in-depth observations. Hence, its entirely realistic – bearing in mind various errors – picture of human contacts in Chekhov’s prose, which in turn can be analysed by diverse methodologies. As a tool for observation of the misunderstandings between the heroes (in the area of love), there is the defective theory of mind employed. And a few texts from early stage of Chekhov’s career fall here under scrutiny (e.g. “Nervers’, ‘Verochka’). In these short stories, misunderstandings emerge from inaccurate reading of consciousness, emotions and feelings of others. In this way, the writer creates the real picture of communication, in which the language is only one of many phenomena determining the success in human relationships.

PROFIL KESALAHAN PEMAHAMAN KONSEP CAHAYA PADA SISWA KELAS V SEKOLAH DASAR

This research describes the error concept of light profile in grade V students of SD N Srondol Wetan 02. The error concept made by the students need to be analyzed further in order to get a clear and detailed description of the students' weaknesses in understanding the concept of light and used as a consideration of learning in the business improve the quality of the learning process. Subjects amounted to four students who error concept. Data collection techniques use documentation, tests, observations, and interviews. Analysis of qualitative data through three stages of data reduction, presenting data, and concluding. The results showed: (1) KP-1 students have low sample indicator but KP-2 students actually have good example indicator; 2) errors concepts occur in the concept of light sources, light-permeable objects, light refraction, light of light degradation, and objects utilizing the nature of light; (3) the factors causing error concept of students' are student only learning only the IPA textbook from the school and the notebook from the teacher, the student assumes that all the concepts derived from experience and natural phenomena are true without re-examining the correct theory, reasoning, incomplete and inaccurate reading of textbooks or problems of understanding, as well as the limitations of language in understanding the concept of light.

Respect for Workers in Global Supply Chains: Advancing the Debate Over Sweatshops

ABSTRACT:In “Sweatshops and Respect for Persons” we argued on Kantian grounds that managers of multinational enterprises (MNEs) have the following duties: to adhere to local labor laws, to refrain from coercion, to meet minimum health and safety standards, and to pay workers a living wage. In their commentary on our paper Sollars and Englander challenge some of our conclusions. We argue here that several of their criticisms are based on an inaccurate reading of our paper, and that none of the remaining criticisms successfully challenge our main arguments. By highlighting the shortcomings of their arguments we hope to advance discussion of the ethical treatment of workers in global supply chains.

Comparison of MICRO-ID Listeria Method with Conventional Biochemical Methods for Identification of Listeria Isolated From Food and Environmental Samples: Collaborative Study

Fourteen laboratories participated in a collaborative study to evaluate the ability of the MICRO-ID Listeria identification method to correctly identify Listeria isolated from food and environmental sources. Each collaborator received 60 isolates consisting of 51 Listeria and 9 non-Listeria cultures. All isolates were identified by conventional biochemical analyses in the principal laboratory. Cultures were checked for purity by Gram staining and examined for oxidase and catalase activities. Only Gram positive, oxidase negative, catalase positive cultures were tested with the method. Colonies from trypticase soy agar with 0.6% yeast extract were suspended in 4.6 ml_ physiological saline to a MacFarland No. 1 turbidity standard and used to inoculate the test strip. In addition, the hemolytic reaction of each isolate was determined by using the Christie-Atkins-Munch-Peterson (CAMP) test and by stabbing sheep blood agar. Identification of Listeria is based on the octal code obtained from the strip and the hemolytic reaction of the isolate. The MICRO-ID Listeria method agreed with conventional biochemical identification for 98.0% of L. monocytogenes, 77.1% of L. seeligeri, 98.0% of L ivanovii, 96.4% of L. grayi/L. murrayi, 73.9% of L. welshimeri, and 100% of L innocua isolates. A large percentage of errors in identification of the L. seeligeri and L ivanovii cultures was caused by inaccurate reading of the CAMP and hemolysis tests rather than errors in the test strip. The method was adopted first action by AOAC International.