scholarly journals ДОСЛІДЖЕННЯ СВІТЛОСТІЙКОСТІ ПОФАРБУВАНЬ БАВОВНЯНОГО ТРИКОТАЖУ, ОБРОБЛЕНОГО НОВИМИ ТІОСУЛЬФОНАТНИМИ ПРЕПАРАТАМИ

2019 ◽  
Vol 1 (12) ◽  
pp. 176-189 ◽  
Author(s):  
Editor Editor

Мета. Аналіз світлостійкості пофарбувань та субстрату білизняного бавовняноготрикотажу обробленого антимікробними тіосульфонатними обробними препаратамиЕТС, МТС і АТС.Методика. При дослідженнях використовували передбачені діючими державнимистандартами методи, які дозволяють визначити світлостійкість забарвлень (колірнийтон, світлість, насиченість, загальний колірний контраст) та розривальніхарактеристики бавовняних білизняних трикотажних полотен, що досліджуються. Дляоцінки світлостійкості пофарбувань, яке проводилось у лабораторії ДП «Хімтекст» (м.Херсон), використано спектрофотометр Premier Colorscan Colorlab (Spectro:5100) згідноз вимогами ДСТУ ГОСТ ІСО 105 – 701:2000 з використанням розрахункових формулсистеми CIELxaxbx.Результати. Вивчено можливість та обґрунтована доцільність використання увітчизняному текстильному та трикотажному виробництвах тіосульфонатних обробнихпрепаратів ЕТС, МТС і АТС для антимікробного оброблення бавовняних білизняних трикотажних полотен літнього асортименту з метою їх ефективного захисту відбіодеструкції целюлозоруйнуючими патогенними та ґрунтовими мікроорганізмами.Встановлено, що в процесі антимікробного оброблення бавовняних трикотажних полотенпрепаратами ЕТС, МТС і АТС не спостерігається помітних змін їх механічнихвластивостей (розривальне навантаження), що може погіршити зносостійкість тагігієнічні показники названих полотен в процесі експлуатації виробів із них. Не виявленонегативного впливу оброблення препаратами ЕТС, МТС і АТС на зміну колірниххарактеристик (світлості, насиченості, колірного тону і загального колірного контрасту)і світлостійкості пофарбувань досліджуваних трикотажних полотен кубовимибарвниками.Основною перевагою тіосульфонатних обробних препаратів є те, що їхвикористання гарантує одночасне досягнення на трикотажних бавовняних білизняних іодягових полотнах високої атмосферостійкості без погіршення їх механічнихвластивостей.Наукова новизна. В результаті проведених досліджень, встановлено, щотіосульфонатні антимікробні препарати ЕТС, МТС і АТС здатні ефективно захищатибавовняні білизняні трикотажні полотна літнього асортименту від тривалої дії сонячноїрадіації.Практична значимість. Встановлено, що обрані нами тіосульфонатні препаратиЕТС, МТС і АТС придатні не тільки для ефективного захисту від мікробіологічноїдеструкції, але й від тривалої дії світлопогоди бавовняних трикотажних полотенлітнього асортименту (робочого одягу, спортивної білизни). Purpose. The purpose of this work is to introduce the new types of antimicrobialpreparations to the cellulose production to provide at the same time bio-resistance, weatherresistance and environmental safety to cotton, polyester, multi-component materials. The mostdemanded creation is producing similar materials for the products of linen assortment, which aredirectly in contact with the skin, safe for human health and environment. Products from suchmaterials can be used both at home and in medical institutions, in the food industry, in trains oflong-distance trafficking, in the army, etc.A lot of attention all over the world is paid for the development of various methods forobtaining and studying the properties of materials with antiseptic attributes. However, despite thelarge amount of work in this area, many issues are still far from their solution. In particular, the actual task is to create environmentally friendly textile materials and knitted cloths withantimicrobial properties, which are stored in wet treatments, washing, light exposure, that isnecessary in using underwear in real conditions. The problems associated with reducing the costto obtain such materials are equally important. Therefore, the purpose of our research is toanalyze the light-fastness of paints and the substrate of linen cotton knitted fabrics treated withantimicrobial thiosulfonate preparations of ETS, MTS and ATS.Method. The methods provided in applicable state standards that determine the lightnessof colors (color tone, lightness, saturation, overall color contrast) and the breakingcharacteristics of the cotton linen fabrics were used in the studies.Results. The possibility and feasibility of using thiosulonate preparations including ETS,MTS and ATS in the domestic textile and knitwear production for antimicrobial treatment ofcotton linen knitted cloths of the summer range for the purpose of their effective protectionagainst biodestruction by cellulose-destroying pathogenic and soil microorganisms aresubstantiated.In the process of antimicrobial treatment of the studied cotton knitted fabrics by ETS, MTSand ATS preparations, no noticeable changes in their mechanical (breaking strength) propertiesare observed, which may worsen the wear resistance and hygienic performance of these fabricsduring the operation of products from them.No negative influence of treatment with ETS, MTS and ATS preparations on the change ofcolor characteristics (lightness, saturation, color tone and general color contrast) and lightstability of coloring of studied knitted fabrics by cubic dyes was found.The main advantage of thiosulfonate treatments is that their use guarantees simultaneousachievement on knitted cotton linen and clothing cloths of high atmospheric resistance withoutdegradation of their mechanical properties.Scientific novelty. As a result of the research, thiosulfonate antimicrobial preparationsincluding ETS, MTS and ATS are found to able to effectively protect the cotton linen knitted linenof the summer range from prolonged exposure to solar radiation.Practical significance. The thiosulfonate preparations chosen by us, such as ETS, MTSand ATS, are revealed to suitable not only for effective protection against microbiologicaldestruction, but also from the long-lasting effect of light clothing of cotton knitted linen of summerassortment (working clothes, sportswear).

1995 ◽  
Vol 268 (5) ◽  
pp. R1111-R1116 ◽  
Author(s):  
P. Depres-Brummer ◽  
F. Levi ◽  
G. Metzger ◽  
Y. Touitou

In a constant environment, circadian rhythms persist with slightly altered period lengths. Results of studies with continuous light exposure are less clear, because of short exposure durations and single-variable monitoring. This study sought to characterize properties of the oscillator(s) controlling the rat's circadian system by monitoring both body temperature and locomotor activity. We observed that prolonged exposure of male Sprague-Dawley rats to continuous light (LL) systematically induced complete suppression of body temperature and locomotor activity circadian rhythms and their replacement by ultradian rhythms. This was preceded by a transient loss of coupling between both functions. Continuous darkness (DD) restored circadian synchronization of temperature and activity circadian rhythms within 1 wk. The absence of circadian rhythms in LL coincided with a mean sixfold decrease in plasma melatonin and a marked dampening but no abolition of its circadian rhythmicity. Restoration of temperature and activity circadian rhythms in DD was associated with normalization of melatonin rhythm. These results demonstrated a transient internal desynchronization of two simultaneously monitored functions in the rat and suggested the existence of two or more circadian oscillators. Such a hypothesis was further strengthened by the observation of a circadian rhythm in melatonin, despite complete suppression of body temperature and locomotor activity rhythms. This rat model should be useful for investigating the physiology of the circadian timing system as well as to identify agents and schedules having specific pharmacological actions on this system.


2020 ◽  
Vol 202 (14) ◽  
Author(s):  
Lisa Juliane Kahl ◽  
Alexa Price-Whelan ◽  
Lars E. P. Dietrich

ABSTRACT Light is known to trigger regulatory responses in diverse organisms, including slime molds, animals, plants, and phototrophic bacteria. However, light-dependent processes in nonphototrophic bacteria, and those of pathogens in particular, have received comparatively little research attention. In this study, we examined the impact of light on multicellular development in Pseudomonas aeruginosa, a leading cause of biofilm-based bacterial infections. We grew P. aeruginosa strain PA14 in a colony morphology assay and found that growth under prolonged exposure to low-intensity blue light inhibited biofilm matrix production and thereby the formation of vertical biofilm structures (i.e., “wrinkles”). Light-dependent inhibition of biofilm wrinkling was correlated with low levels of cyclic di-GMP (c-di-GMP), consistent with the role of this signal in stimulating matrix production. A screen of enzymes with the potential to catalyze c-di-GMP synthesis or degradation identified c-di-GMP phosphodiesterases that contribute to light-dependent inhibition of biofilm wrinkling. One of these, RmcA, was previously characterized by our group for its role in mediating the effect of redox-active P. aeruginosa metabolites called phenazines on biofilm wrinkle formation. Our results suggest that an RmcA sensory domain that is predicted to bind a flavin cofactor is involved in light-dependent inhibition of wrinkling. Together, these findings indicate that P. aeruginosa integrates information about light exposure and redox state in its regulation of biofilm development. IMPORTANCE Light exposure tunes circadian rhythms, which modulate the immune response and affect susceptibility to infection in plants and animals. Though molecular responses to light are defined for model plant and animal hosts, analogous pathways that function in bacterial pathogens are understudied. We examined the response to light exposure in biofilms (matrix-encased multicellular assemblages) of the nonphotosynthetic bacterium Pseudomonas aeruginosa. We found that light at intensities that are not harmful to human cells inhibited biofilm maturation via effects on cellular signals. Because biofilm formation is a critical factor in many types of P. aeruginosa infections, including burn wound infections that may be exposed to light, these effects could be relevant for pathogenicity.


2016 ◽  
Vol 11 (1) ◽  
pp. 155892501601100 ◽  
Author(s):  
Ramazan Erdem ◽  
Subbiyan Rajendran

The antibacterial effect of silver on knitted and nonwoven structures has been investigated. Three types of interlocked knitted fabrics (100% polyester, 100% viscose and 50%/50% polyester/viscose) were scoured and treated with silver ions by pad-dry-cure method. A nonwoven fabric (100% bleached cotton) was also treated with silver ions by using a spray technique. Physical and tensile properties of the treated fabrics were analyzed and compared with those of corresponding untreated ones. Results indicate that scouring process and antimicrobial treatment influenced the physical properties and antimicrobial effectiveness of the fabrics. An increase in tensile strength of 100% polyester and 100% viscose is observed after the antimicrobial treatment. The absorbency of all the treated knitted fabrics is decreased but it is substantially increased in the case of nonwoven fabrics. Antimicrobial activity of the treated fabrics was tested against Gram-positive bacterium Staphylococcus aureus. The results show that the treated nonwoven and blended (50%/50% polyester/viscose) knitted fabrics registered highest antimicrobial effect.


2019 ◽  
Vol 1 (1) ◽  
pp. 465-471 ◽  
Author(s):  
Arnold Pabian

AbstractEnvironmental safety management contributes to sustainable development. Sustainable development is a consequence of global ecological and social threats. The natural potential of the Earth is running out, which is confirmed by worsening indicators of Living Planet Index and Ecological Footprint. Acceleration of sustainable development is particularly important to production enterprises. Production enterprises use the majority of the world’s non-renewable resources and they are largely responsible for environmental pollution. The negative influence of the enterprises on the environment can be stopped by transforming them into sustainable enterprises. Sustainable top managers should play a key role in this process. Sustainable top managers constitute a new currently emerging category of leaders. They possess knowledge and experience in both management as well as sustainability. Their features include social and ecological sensitivity, innovation and the ability to convince and motivate employees within the scope of sustainable development as well. Their objective is to create an organization whose mission, strategy and operational action programmes include ecological and social initiatives. Due to this, sustainable development is becoming an important and permanent element of enterprise functioning. Sustainable leadership constitutes a key challenge for top managers which they should accept for the benefit of future generations. The support of environmental safety management by sustainable top managers promotes its implementation in enterprises thanks to their knowledge and ecological sensitivity as well as engaging in sustainable development.


1986 ◽  
Vol 64 (5) ◽  
pp. 1016-1017 ◽  
Author(s):  
Demetrios J. Vakalounakis ◽  
Christos Christias

Prolonged exposure to blue light was necessary for almost complete inhibition of sporulation in Alternaria cichorii Nattrass. When a 24-h blue light exposure was followed by darkness, the inhibition of sporulation decreased gradually.


2012 ◽  
Vol 488-489 ◽  
pp. 1547-1552 ◽  
Author(s):  
Noraini Ahmad ◽  
Sabarinah Sh Ahmad ◽  
Anuar Talib

This paper highlights the results of light levels and light-fastness study conducted in four daylit historical museum galleries in Malaysia. These museums architectural features allow sun radiation into the building, causing light exposure damage to artifacts. This study aims to evaluate the luminous exposures and light-fastness as an initial preventive conservation measure in daylit historical museum galleries under the tropical sky conditions. Light sensors with data-loggers and Light-fastness dosimeters were installed throughout the museums to take cumulative light exposure measurements during museum opening hours. Both instrumentations were tested in the field during different campaigns exposures. After exposures between 90 and 100 days, these dosimeters showed photo-induced colour changes which translated exposures into equivalent luminous exposure and estimated annual exposures (Lux hours) which were used to validate the measured values of illuminance data. Simulated light dosimeters and measured illuminance data show good correlation. Thus, equivalent light dosimeter makes sense to assess the impact of light distributions.


2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Jolita Krisciunaite ◽  
Brigita Kalendraite ◽  
Lina Ragelienė ◽  
Evelina Merkelyte ◽  
Daiva Mikucioniene

Abstract Antimicrobial finishing is increasingly used in textile products to increase their functionality. Antimicrobial properties became extremely important during the COVID-19 situation. The main problems faced by antimicrobial finishing are nontoxicity and durability (wash-resistance) of antibacterial activity. Also, it is important to determine whether the antimicrobial finishing changes comfort properties, such as air permeability. This paper deals with the durability of antimicrobial treatment, that is, resistance to washing, and effect on the structural changes that may have influence on the comfort properties, such as permeability to air. Knits of various raw compositions were antimicrobial-treated with the new commercial antimicrobial product, Si Bactericidal (Smart Inovation, Portugal). After the antimicrobial treatment, knitted specimens were washed 50 times and changes in their structural parameters, air permeability, and antimicrobial activity were measured. It was found that the mentioned antimicrobial treatment gives very good antimicrobial activity to the treated fabric and is wash-resistant and long-lasting. Also, it does not change dimensions and permeability to air of the treated fabrics with some exceptions of cotton-based knitted structures.


Author(s):  
S. Ulyhanets ◽  
L. Melnyk ◽  
О. Kravchuk ◽  
Т. Melnyk

The essence of natural and industrial safety is revealed. The sources and and types of dangers are described. Particular attention is paid to environmental safety. Regional characteristics of natural and man-made threats of Ukraine are spotlighted. The threats to natural and man-made disasters related to terrain features, climate, geology, economy specialization are identified here. Results of the analysis of natural and man-made threats indicate that the current state of environmental safety in most regions of Ukraine is almost at the required level. Particular attention is drawn to the objects of nuclear, chemical, metallurgy, mining, civil engineering, transportation systems. The negative influence of natural and technogenic safety on agriculture in Ukraine is shown as well. The main directions of environmental protection in agriculture are outlined. A need to provide a concrete and realistic plan to minimize the impact on the risks associated with natural and man-made hazards is identified. Economic development and natural and man-made threats in the country at the present stage is characterized by dynamic changes and complex relationships that contribute to the formation of large risks in the environmental security of the state. Significant processes are i significantly impeded by the deepening global financial and economic crisis, significantly limits the ability of the state to prevent and neutralize threats of natural and man-made origin.


2011 ◽  
Vol 81 (18) ◽  
pp. 1903-1915 ◽  
Author(s):  
Ahu Demiroz Gun ◽  
Bahar Tiber

In this study, the color and color fastness properties of the dyed plain knitted fabrics made from 50/50 bamboo/cotton blended yarns with three different stitch lengths are investigated in comparison with those of the similar fabrics made from 50/50 conventional viscose/cotton and 50/50 modal/cotton blended yarns. Abrasion behaviors of the fabrics are assessed by measuring the weight loss and the color values after four different increasing abrasion cycles. The bamboo/cotton fabrics reveal the highest K/S and C* values, but the lowest L* values before abrasion. The lowest weight loss values are obtained for the bamboo/cotton fabrics. Regarding the color properties after abrasion, the bamboo/cotton fabrics show the highest K/S and C* values, but the lowest L* values as in the case of those obtained before abrasion. The highest color difference values (ΔE*) occurred between the beginning and the end of the abrasion test (20000 cycles) and are observed for the bamboo/cotton fabrics. The rubbing, wash and perspiration fastness results of the bamboo/cotton fabrics are found to be worse than those of the other fabrics having viscose/cotton and modal/cotton yarns. However, the highest light fastness results are obtained for the bamboo/cotton fabrics. From the color values after abrasion and the fastness results, it can be concluded that the bamboo/cotton fabrics having the better dyeing properties lose their color more easily than the other fabrics having the viscose/cotton and modal/cotton yarns. The results also indicate that stitch length affects the color values before abrasion and the weight loss and color values after abrasion.


Children ◽  
2021 ◽  
Vol 8 (12) ◽  
pp. 1189
Author(s):  
Manami Tadano ◽  
Aya Yamada ◽  
Yuriko Maruya ◽  
Ryoko Hino ◽  
Tomoaki Nakamura ◽  
...  

Background: Recently, tooth deformities have been frequently encountered by pediatric dentists. Severe enamel hypomineralization sometimes induces pain such as hyperesthesia, but composite resin restoration is difficult because it often detaches without any cavity preparation. Resin-based hypersensitivity inhibitors for tooth physically seal the dentinal tubules. It was reported that hypersensitivity inhibitor containing novel adhesive monomers forms apatite and induces remineralization in vitro. Therefore, these clinical trials assessed the clinical effects of remineralization and the suppression of hypersensitivity by the new agent. Methods: After mechanical tooth cleaning was performed, the hypersensitivity inhibitors were applied and cured by light exposure. Changes in hypersensitivity were determined by visual analog scale (VAS). The improvement of hypomineralization was evaluated by the change in color tone based on the digital images of intraoral photographs. Results: After repeated monthly treatments, these cases showed decreased hypersensitivity after the fourth application, while the opaque white and brownish color improved on the seventh application. Conclusion: This novel hypersensitivity inhibitor with C-MET and MDCP not only suppressed hypersensitivity but also improved cloudiness and brown spots in immature permanent teeth in presented cases.


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