Fabrication of 1, 1-Dimethylhydrazine Gas sensor Based on Nano Structure Conducting Polyaniline

Determination of 1, 1-dimethylhydrazine (DMH) in air is carried out by spectrophotometry, GC or HPLC analysis, but in this study DMH was analyzed by a gas sensor based on nanostructure conducting polyaniline. Determination of DMH has been done very simplely and quickly in recent work. Electrically conductive fibers have been prepared by polymerization of aniline on surfaces of commercial polymer fibers in the presence of an oxidizing agent. The resistance of poly aniline (PANI) coated fiber sensor (PANI-FS) was investigated and related to coating conditions, which was controlled by adjusting the reactant concentrations. The morphology of the conducting film on the surface of the fibers was examined by scanning electron microscope (SEM). The sensing behavior of PANI in the presence of some volatile organic compounds (VOCs) is studied experimentally. The PANI sensor had demonstrated to have good sensitivity for DMH and good reproducibility when reused

Purpose vs performance : what does marine protected area success look like?

Marine protected areas (MPAs) are an increasingly deployed spatial management tool. MPAs are primarily designed for biodiversity conservation, with their success commonly measured using a narrow suite of ecological indicators. However, for MPAs to achieve their biodiversity conservation goals they require community support, which is dependent on wider social, economic and political factors. Despite this, research into the human dimensions of MPAs continues to lag behind our understanding of ecological responses to MPA protection. Here, we explore stakeholders’ perceptions of what MPA success is. We conducted a series of semi-structured interviews and focus groups with a diverse group of stakeholders local to a South Australian MPA. What constitutes success varied by stakeholder group, and stakeholders’ stated understanding of the purpose of the MPA differed from how they would choose to measure the MPA’s success. Indeed, all interviewees stated that the primary purpose of the MPA was ecological, yet almost all (>90%) would measure the success of the MPA using social and economic measures, either exclusively or in conjunction with ecological ones. Many respondents also stated that social and economic factors were key to the MPA achieving ongoing/future success. Respondents generated a large range of novel socio-economic measures of MPA success, many of which could be incorporated into monitoring programs for relatively little additional cost. These findings also show that success is not straightforward and what constitutes success depends on who you ask. Even where an MPA’s primary ecological purpose is acknowledged by stakeholders, stakeholders are likely to only consider the MPA a success if its designation also demonstrates social and economic benefits to their communities. To achieve local stakeholder support MPAs and associated monitoring programs need to be designed for a variety of success criteria in mind, criteria which reflect the priorities and needs of the adjacent communities as well as national and international conservation objectives

Artificial intelligence application for classification and selection of fish gelatin packaging film produced with incorporation of palm oil and plant essential oils

Supplementary material related to this article can be found, in the online version, at doi:https://doi.org/10.1016/j.fpsl.2020.100611.The k-Nearest Neighbor (KNN) algorithm was used to classify and select biodegradable packaging produced from fish gelatine incorporated with palm oil and clove and oregano essential oils. All reinforced films are highly resistant to attraction, with an emphasis on a sample of clove essential oil with a value of 53.18 MPa. Also, the addition of palm oil and essential oils increases the elasticity and thickness of the packages. The packages have antioxidant and antimicrobial properties with an inhibition zone for S. aureus of 11.73 and 11.23 mm for the film with essential oil of oregano and film with palm oil, respectively. KNN proved to be efficient for the classification and selection of packaging. The results highlighted the packaging with clove essential oil as the best for presenting the highest values of antioxidant activity, tensile strength, and elongation. Palm oil is an interesting alternative for applications in biodegradable films due to its antimicrobial activity, antioxidant properties, abundance, and low cost. Packaging made of fish gelatin with the addition of vegetable oils is a promising alternative for food applications.The authors thank the Coordination for the Improvement of Higher Education Personnel (CAPES) for the financial support.info:eu-repo/semantics/publishedVersio

ANALISIS SITOGENETIKA PADA PASIEN DENGAN AMENORE PRIMER DI CENTER FOR BIOMEDICAL RESEARCH (CEBIOR) SEMARANG

Background : Primary amenorrhea is a symptom that may result from several quite different causes such as gonadal anomalies, endocrinological imbalance and specific of genetic disorders. Primary amenorrhea is one of indications for cytogenetic analysis, which have shown the importance of chromosomal abnormalities as a cause of amenorrhea. The aim of this study is to know the distribution of karyotype in patients with primary amenorrhea in Center For Biomedical Research (CEBIOR) Medical Faculty of Diponegoro University, Semarang. Subject and Method : This study was a descriptive retrospective and prospective study design. The subjects are patients with primary amenorrhea who examined in CEBIOR Semarang since January 2005 to April 2015. Results : Cytogenetic analysis were carried out to 71 patients with primary amenorrhea during January 2005 to April 2015 and identified 47(65,3%) subjects with 46, XX; 9 (12,7%) subjects with 46, XY and 16 (22,2%) subjects with numerical and structural sex chromosome aberration such as 45, X, 45, X/46, XX, 1Xq, 46, XX/ 45, X (2%) dan 46,XX (99%)/ 45, X (1%), 46,X, i(X)(q10)(85%)/45, X(15%), 45,X(76%)/46, X, i(X)(q10)(24%), 47, XY+21, 46, XX,del (9)(p23)->pter, 46, XX, t(1; X)(p34; q25), 46, XX, t(1; X)(p34; q25), and 46, XX/46, XY(10%). Conclusion : Cytogenetic analysis was done for 71 subjects and mostly subjects have 46, XX karyotype. Cytogenetic investigations are important to established the diagnoses and management for primary amenorrhea cases, although in some cases with cryptic chromosome aberrations should be investigated with molecular analysis. Keywords : Primary amenorrhea, Cytogenetic analysi

Chemiresistive Gas Sensors Based on Conducting Polymers

Chemiresistive gas sensor based on conducting polymer is a type of sensors that presents gas sensors with excellent characters; low-cost fabrication, fast detection, simultaneous determination (array gas sensor), portable devices and so. Theses gas sensors are commonly based on polyaniline (PANI), polypyrrole (PPy), polythiophene (PTh) and their derivatives as a transducer. Common configuration and response mechanism of these sensors are reported in this section. Some factors that induce selectivity to these sensors are discussed. Different materials (conductor or insulant) can be used as a substrate of polymerization. Type of substrate, selective membranes, surface modification of conducting polymer and so can change response behavior of these sensors. </jats:p

Chemiresistive Gas Sensors Based on Conducting Polymers

Chemiresistive gas sensor based on conducting polymer is a type of sensors that presents gas sensors with excellent characters; low-cost fabrication, fast detection, simultaneous determination (array gas sensor), portable devices and so. Theses gas sensors are commonly based on polyaniline (PANI), polypyrrole (PPy), polythiophene (PTh) and their derivatives as a transducer. Common configuration and response mechanism of these sensors are reported in this section. Some factors that induce selectivity to these sensors are discussed. Different materials (conductor or insulant) can be used as a substrate of polymerization. Type of substrate, selective membranes, surface modification of conducting polymer and so can change response behavior of these sensors. </jats:p