Academic literature on the topic 'Biocidal-analysis'
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Journal articles on the topic "Biocidal-analysis"
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Erofeev, V. Т., A. I. Rodin, S. N. Karpushin, et al. "Biocidal cements with active mineral additive: production and properties." Construction Materials, no. 12 (December 15, 2024): 4–18. https://doi.org/10.31659/0585-430x-2024-831-12-4-18.
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Concrete and reinforced concrete structures are susceptible to the negative effects of bacteria, mycelial fungi, and actinomycetes. The purpose of this research is development of compositions of cement binders with active mineral additives for biocidal concretes creation. For biocidal cements with an active additive manufacture following components were used: Portland cement clinker produced by JSC Mordovcement, two-water gypsum of the Poretsky deposit, fly ash of the Krasnoyarsk CHP-3 and biocidal ingredients: sodium sulfate, sodium fluoride. Biocidal cements were obtained by joint grinding of mineral components and biocidal additives, then an active mineral additive was added. The physico-chemical, physico-mechanical and technological properties of the cements with an active mineral additive and composites based on them were determined in accordance with current regulatory documents. X-ray phase analysis, thermogravimetric analysis, differential thermogravimetry, calorimetry and other methods were used in this work. The features of phase transformations in cement stone are revealed depending on the type and content of biocidal ingredients, active mineral additives and hydration time. The absence of ettringite formation during hydration of cements modified with sodium fluoride and the presence of a new hydroaluminate phase have been established. The curves of TG, DTG and DTA for hydrated biocidal cement with the addition of fly ash modified with sodium sulfate are almost identical to the curves of hydrated ordinary cement. The largest amount of C-S-H gel (40 wt. %) was recorded in formulations with an active mineral additive. Based on the results of the study of normal density and setting time of the cement dough, the strength of samples of biocidal cement stone during compression and bending, regression equations were obtained, graphical dependencies were built and optimal compositions of biocidal cements were determined. Compositions of biocidal cements superior in physical and mechanical properties to ordinary Portland cements, which are recommended for the manufacture of biostable building products, have been obtained.
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MARTYROSIAN, І., О. PAKHOLIUK, and L. NIKOLAYCHUK. "INVESTIGATION OF MECHANICAL PROPERTIES OF COTTON-POLYESTER FABRICS WITH BIOCIDAL TREATMENT." Herald of Khmelnytskyi National University 301, no. 5 (2021): 209–12. http://dx.doi.org/10.31891/2307-5732-2021-301-5-209-212.
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This article is devoted to the study of some aspects of increasing the biostability of cellulose-containing textile materials with new ecological biocidal products. This paper considers the study of the possibility of application for antimicrobial treatment of clothing cellulose-containing textile materials, new biocidal products of thiosulfonate structure and evaluation of changes in some of their mechanical properties. The influence of biocidal treatment on the rupture characteristics of tissues of different fibrous composition has been studied. New biocidal preparations of thiosulfonate structure of domestic production are used for biocidal treatment, which are synthetic analogues of natural phytoncides – garlic, onion and certain types of cabbage – ethylthiosulfanilate (ETS), methylthiosulfanilate (MTS) and allylthiosulfanilate (AТS). The aim of the article is to study the effect of new biocidal drugs of thiosulfonate structure on the change of the main mechanical properties that determine wear resistance. The efficiency and expediency of the use of these biocides are shown. As a result of the analysis of the received experimental data it is established that new biocidal drugs ETS, ATS, MTS not only protect fabrics from undesirable microbiological destructions, but also do not lead to deterioration of physical and mechanical properties of investigated fabrics. As a result of treatment with biocidal products of thiosulfonate structure of pure cotton and cotton-polyester fabrics for special purpose clothing, there is no significant reduction in the breaking load. This is due to the fact that when treated with the studied biocidal products as a result of modification there is no increase in the mutual mobility of cellulose macromolecules, so the possibility of load redistribution within the fiber and tensile strength fall on more structural elements.
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Berti, Letizia, Francesco Arfelli, Federica Villa, et al. "LCA as a Complementary Tool for the Evaluation of Biocolonization Management: The Case of Palazzo Rocca Costaguta." Heritage 7, no. 12 (2024): 6871–90. https://doi.org/10.3390/heritage7120318.
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The 17th Century Casa a Ponente of Palazzo Rocca Costaguta’s wall provided an opportunity for an evaluation based on a Life Cycle Assessment (LCA) approach of conservation treatments aiming at removing biological colonization from built heritage surfaces. The investigated surfaces were historic plasters partially covered by a patchy green patina due to biofilm recolonization soon after a previous biocidal treatment. Areas of the biocolonized wall were treated by conservation professionals according to both conventional and “green” (i.e., exploiting natural active principles) biocidal products, including Preventol RI 50 (active substance benzalkonium chloride), Essenzio (active substance essential oregano oil), and hydrogen peroxide. Upon treatment, LCA analysis was conducted to evaluate the environmental impact of the different solutions, including a no-treatment option. LCA analysis was based on on-site investigations of the untreated wall surface with and without biofilm and following the biocidal treatment. The conservation treatment’s impact on the mineral substrate was based on digital microscopy, colorimetry, and water contact angle measurements via an innovative portable method. The results highlighted the impacts of the different biocidal treatments, which, in some cases, have not completely removed the biofilm and, in some cases, have altered the surface properties of the plaster. This pointed out the opportunity to re-think conservation strategy, including LCA analysis as a complementary tool to assess the environmental impact of the different conservation treatments and procedures.
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Buchberger, Tamara, Markus Himmelsbach, and Wolfgang Buchberger. "Trace analysis of biocidal oligoguanidines in environmental water samples." Journal of Chromatography A 1318 (November 2013): 22–26. http://dx.doi.org/10.1016/j.chroma.2013.10.005.
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Fatima Javed, Fatima Javed, Saqib Ali Saqib Ali, Khurram Shahzad Munawar Khurram Shahzad Munawar, Ali Haider Ali Haider, and N. A. Shah and Z. Rashid N A Shah and Z Rashid. "Synthesis, Structural Elucidation, and Therapeutic Screening of Organotin(IV) derivatives of oxo-ethyl carbonodithioate." Journal of the chemical society of pakistan 45, no. 4 (2023): 345. http://dx.doi.org/10.52568/001282/jcsp/45.04.2023.
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Exploring the therapeutic potential of organotin-based oxo-ethyl carbonodithioates, a series of organotin(IV) thiocarboamates (1-5) were synthesized with diverse alkyl and phenyl substituents. The chemical- composition, morphology, theoretical properties, and drug-DNA binding capabilities of the synthesized derivatives were performed by applying different characterization techniques like FT-IR, NMR (1H, 13C), AFM, DFT analysis, and UV-Vis spectroscopy respectively. The NMR data indicated six and four coordinated geometries, while the AFM results revealed smart surfaces concerning the grain size and root mean square (RMS) roughness, signifying catalytic and biocidal uses. The drug-DNA binding via intercalative mode of interaction with blue and red shifts was determined by using using UV spectroscopy. The in vitro biocidal capacity of selected complexes was evaluated against typical bacterial, fungal, cytotoxic, and leishmanial strains respectively. As a result of the surface and biocidal characterization, the synthesized complexes may be applied with greater potential in biomedical, pharmaceutical, infectious, catalysis, and cosmetics industries
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Khan, Muhammad Saqib, Jehanzeb Ali Shah, Muhammad Arshad, et al. "Photocatalytic Decolorization and Biocidal Applications of Nonmetal Doped TiO2: Isotherm, Kinetic Modeling and In Silico Molecular Docking Studies." Molecules 25, no. 19 (2020): 4468. http://dx.doi.org/10.3390/molecules25194468.
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Textile dyes and microbial contamination of surface water bodies have been recognized as emerging quality concerns around the globe. The simultaneous resolve of such impurities can pave the route for an amicable technological solution. This study reports the photocatalytic performance and the biocidal potential of nitrogen-doped TiO2 against reactive black 5 (RB5), a double azo dye and E. coli. Molecular docking was performed to identify and quantify the interactions of the TiO2 with β-lactamase enzyme and to predict the biocidal mechanism. The sol-gel technique was employed for the synthesis of different mol% nitrogen-doped TiO2. The synthesized photocatalysts were characterized using thermal gravimetric analysis (TGA), scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), Brunauer–Emmett–Teller (BET) and diffuse reflectance spectroscopy (DRS). The effects of different synthesis and reaction parameters were studied. RB5 dye degradation was monitored by tracking shifts in the absorption spectrum and percent chemical oxygen demand (COD) removal. The best nanomaterial depicted 5.57 nm crystallite size, 49.54 m2 g−1 specific surface area, 11–40 nm particle size with spherical morphologies, and uniform distribution. The RB5 decolorization data fits well with the pseudo-first-order kinetic model, and the maximum monolayer coverage capacity for the Langmuir adsorption model was found to be 40 mg g−1 with Kads of 0.113 mg−1. The LH model yielded a higher coefficient KC (1.15 mg L−1 h−1) compared to the adsorption constant KLH (0.3084 L mg−1). 90% COD removal was achieved in 60 min of irradiation, confirmed by the disappearance of spectral peaks. The best-optimized photocatalysts showed a noticeable biocidal potential against human pathogenic strain E. coli in 150 min. The biocidal mechanism of best-optimized photocatalyst was predicted by molecular docking simulation against E. coli β-lactamase enzyme. The docking score (−7.6 kcal mol−1) and the binding interaction with the active site residues (Lys315, Thr316, and Glu272) of β-lactamase further confirmed that inhibition of β-lactamase could be a most probable mechanism of biocidal activity.
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Armatys, Paulina, Elżbieta Długoń, Wojciech Smółka, et al. "Bactericidal Properties of the Sol-gel Layer on Polymer Substrates in Medical Applications." Journal of Casting & Materials Engineering 8, no. 4 (2024): 59–67. https://doi.org/10.7494/jcme.2024.8.4.59.
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Polymeric biomaterials are a group of plastics used in medical devices, implants, and artificial organ components. In order to maintain the higher asepticity of the products, solutions based on the modification of the volume or surface of a plastic with biocidal agents, e.g. antibiotics, nanoparticles, are used. One of the methods used to impart biocidal properties to the material can be the use of layers applied by the sol-gel method. The aim of this study was to produce homogeneous and durable coatings on inert and hydrophobic silicone surfaces based on polysiloxane sols with biocidal activity against model bacteria: Gram negative (Escherichia coli, Klebsiella pneumoniae) and Gram positive (Staphylococcus aureus, Enterococcus faecalis). This paper presents results of investigations on a commercial biomedical silicone material (DEMED Sp. zoo) modified with eight sols; siloxane (TD), phenol-siloxane (FD), siloxane-aluminum (TD-Al), siloxane-titanium (TD-Ti), titanium (Ti), zinc (Zn), and TD and TD-Al sols modified with green tea extract (TD-GT, TD-Al-GT). The reference for the tested materials was unmodified silicone. In order to be prepared for coating, the siloxane samples were etched with hydrofluoric acid. Residual acid was removed from the silicone by washing and the substrates were then coated with sols by means of dip coating. The modified materials were then polymerized at 100°C for one week. The produced layered composites were subjected to microstructural, physicochemical, structural and microbiological analysis by contacting them with Gramm negative and Gramm positive bacteria. It was shown that the strongest biocidal properties were exhibited by samples modified with the sols based on - Zn, TD-Ti, Ti, TD-Al-GT and TD-GT.
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Stepczyńska, Magdalena, Alona Pawłowska, Krzysztof Moraczewski, et al. "Evaluation of the Mechanical and Biocidal Properties of Lapacho from Tabebuia Plant as a Biocomposite Material." Materials 14, no. 15 (2021): 4241. http://dx.doi.org/10.3390/ma14154241.
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The aim of this article is to discuss in detail the physicochemical properties of polylactide (PLA) reinforced by cortex fibers, which may cause bacterial mortality and increased biodegradation rates. PLA biocomposites containing cortex Lapacho fibers from Tabebuia (1–10 wt%) were prepared by extrusion and injection moulding processes. The effects of Lapacho on the mechanical and biocidal properties of the biocomposites were studied using tensile and impact tests, dynamic mechanical analysis (DMA), differential scanning calorimetry (DSC), thermogravimetry (TG), and the method of evaluating the antibacterial activity of antibacterial treated according to the standard ISO 22196:2011. It also presented the effects of Lapacho on the structural properties and biodegradation rates of biocomposites. This research study provides very important results complementing the current state of knowledge about the biocidal properties of Lapacho from Tabebuia plants and about cortex-reinforced biocomposites.
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Mendes, Elton, C. M. Oliveira, C. G. Tachinski, et al. "Antibacterial and Antifungal Glass with High Biocide Performance: Increased Antimicrobial Efficiency by Acid Activation." Materials Science Forum 727-728 (August 2012): 1125–30. http://dx.doi.org/10.4028/www.scientific.net/msf.727-728.1125.
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A compound contending silver ion specimens presents biocidal properties with effect proportional to ion concentration. An efficient biocidal material can be developed by incorporating silver ions species in glasses by ionic exchange process. The reactive area and material porosity are factors that influence the ion exchange reaction efficiency. Previous studies show that the acid activation of glasses increases the absorption capacity and can also increase the exchange capacity. This paper presents preliminary results on the biocide potencial optimization of the biocide powder glass. This process was performed using hydrochloric acid. Different pH (1.00, 3.00 and 5.00), treatment time (2.0, 4.0 and 6.0 hours) and temperature (30.0, 60.0 and 90.0°C) were used in the samples development. Microbiological analysis of the samples was made by disk diffusion method in the bacteria species Echerichia coli and Staphylococcus aureus. Samples were still submitted to EDS and Atomic Absorption.
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Ivković, Ivana Katarina, Stanislav Kurajica, Marija Vuković Domanovac, Katarina Mužina, and Ivan Borić. "BIOCIDAL PROPERTIES OF CUONANOPARTICLES." Technologica acta 17, no. 1 (2024): 19–24. http://dx.doi.org/10.51558/2232-7568.2023.17.1.19.
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Biocides are products used to prevent or control the spread of various harmful organisms such as bacteria or viruses. Silver and gold nanoparticles are mostly used as active substances of biocides used in the medical field. However, a more economically acceptable alternatives are different copper compounds, specificallycopper(II) oxide. CuO nanoparticles were gained via sonicationmethod from copper(II) acetate in a sodium hydroxide solution. Physical and chemical properties of gained CuO nanoparticles were investigated by X-ray diffraction analysis (XRD), energy dispersive X-ray spectroscopy (EDS), thermogravimetric analysis (TGA)and atomic force microscopy (AFM). Biocidal tests were performed on bacteria Pseudomonas aeruginosaand Bacillus subtilis,as well on fungi Candida albicansand Aspergillus nigerusing the disc diffusion method. The ultrasonic irradiation method was found to yield pure CuO nanoparticles smaller than 70 nm. Also, EDS measurement verified the stoichiometric distribution of copper and oxygen in the sample.Antimicrobialproperties were proven excellent for both bacteria and fungiexcept for Pseudomonas aeruginosa,for which CuO nanoparticles seem to have low effect. KEYWORDS:copper(II) oxide; sonication; antimicrobialproperties
Dissertations / Theses on the topic "Biocidal-analysis"
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Khasawneh, Mohammad A. "Natural and semi-synthetic compounds with biocidal activity against arthropods of public health importance." Thesis, 2003. http://hdl.handle.net/1957/30966.
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This study identified new compounds with pest control activities. The two
sources of candidates that were followed here were the main heartwood extract of
Alaska Yellow Cedar (AYC) constituents and several semi-synthetic counterparts.
Five compounds were isolated and identified for the first time in AYC
heartwood in this research: two monoterpenes, two sesquiterpenes, and one
lignan. The two monoterpenes were (1S)-2-oxo-3-p-menthenol (41) and (4R)-4-hydroxy-4-isopropyl-cyclohex-1-enecarboxylic acid (63). The two sesquiterpenes
were (5S,7R,10R,11R)-eudesm-4(14)-ene-11,12-diol (46) and (4R,5S,7R)-1(10)-
eremohpilen-11,12-diol (59). The lignan was (1R,2S,5R,6S)-2,6-bis-(3,5-
dimethoxy-4-hydroxyphenyl)-3,7-dioxabicyclo-[3.3.0]octane,(67). Structures for
these compounds were confirmed on the basis of spectroscopic techniques such as
1- and 2-D NMR, high resolution MS and IR.
The pest control activity studies of 15 compounds isolated or semi-synthesized
from AYC heartwood were conducted at the Centers for Disease
Control and Prevention (CDC). Two types of studies were conducted--short-term
(24h) and residual (over 1-4 weeks) activity for application against three types of
pests related to human health - nymphal I. scapularis ticks, adult X cheopis fleas
and adult Ae. eagypti mosquitoes.
The 24 h studies revealed that nootkatone, valencene-13-aldehyde and
valencene-13-ol were the most active among the studied compounds against the
three pests. They exhibited highly improved pest control activities compared to
valencene. This suggests that oxidation on both positions C-2 and C-13 of the
eremophilane ring structure has an important effect on the activity. For
compounds where the conformation of the eremophilane bicyclic ring has been
altered, the activity seemed to diminish greatly. The above mentioned three
compounds can be good candidates as pest control lead compounds.
The residual studies revealed that the most active compounds exhibited
activity profiles that generally decreased with time. Although the long-term safety
of these compounds has yet to be evaluated, the natural origin and the long history
of use of these compounds suggest that they can be promising candidates. This
study revealed that the three most promising compounds in the 24 h study exhibited reasonably promising behavior, which makes them even stronger as pest
control candidates.<br>Graduation date: 2004
Conference papers on the topic "Biocidal-analysis"
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Videla, H. A., P. S. Guiamet, O. R. Pardini, E. Echarte, D. Trujillo, and M. M. S. Freitas. "Monitoring Biofilms and MIC in an Oilfield Water Injection System." In CORROSION 1991. NACE International, 1991. https://doi.org/10.5006/c1991-91103.
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Abstract Results of a monitoring program to assess corrosion and biofouling in the waterflood system of an oil field are presented. The effect of biocide treatment on sessile and planktonic bacterial population and its correlation with biofouling and corrosion of two metal surfaces (carbon steel and AISI 316 SS) are studied through a monitoring scheme based on laboratory and field measurements. A new multipurpose sidestream sampling device (Renaprobe), is used to collect biofilm and corrosion samples. Scanning electron microscopy (SEM) observations of the biofilm, inorganic passive layers and metal attack, are complemented with energy dispersive X ray analysis (EDAX) of biological and inorganic deposits. Present results show a very good correlation between biofouling and corrosion attack of carbon steel samples. Preliminary results of biocidal treatment and its effect on the biofilm and corrosion control are also discussed.
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Shafaghi, R., L. Pershin, M. Riguette, and J. Mostaghimi. "Sporicidal Efficacy of Thermal Spray Copper Alloy Coating with Varying Degrees of Roughness." In ITSC2017, edited by A. Agarwal, G. Bolelli, A. Concustell, et al. DVS Media GmbH, 2017. http://dx.doi.org/10.31399/asm.cp.itsc2017p0042.
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Abstract This study was focused on the biocidal efficacy on spores of copper alloy sheet and copper alloy coating at two different surface topographies. Endospores can remain viable in a dormant state for centuries. Our work compares the effectiveness of copper alloy coating and copper sheet metal in killing endospores. A twin-wire arc spray system was used for coating of stainless steel coupons. The feedstock was CuNiZn wire, the coating thickness was 400 µm. The copper alloy sheet metal had the same composition and is registered as antimicrobial by Environmental Protection Agency (US). Uncoated stainless steel coupons were used as controls in all experiments. The surface was polished to two roughness levels: Ra=3.5 µm and Ra=0.1 µm. The surface topography was analyzed by a stylus profilometer and 3D image analysis. EDS and FIB were used to characterize the elemental composition and structure of flower-like nanostructures and endospores. The results obtained in this study indicated that changes in Ra values of 0.1 and 3.5 µm had no significant impact on the biocidal activity of sheet metal and the coating on E. coli, S. epidermidis and B. subtilis. The coating was as effective as the EPA-certified sheet metal in the destruction of vegetative cells within 5 minutes. This study indicates that degradation of B. subtilis endospore begins within 2 hours after exposure to the coating. By day seven, only extensively degraded endospores and nanostructures were visible on both surfaces. Our results show that thermal spray copper alloy coatings were as effective as certified antimicrobial sheet metal in the destruction of endospores within hours; however, the coating was more effective in killing the endospores after one week of exposure.
Reports on the topic "Biocidal-analysis"
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Webb, Stephen W., Darryl L. James, Michael R. Hibbs, et al. Analysis of micromixers and biocidal coatings on water-treatment membranes to minimize biofouling. Office of Scientific and Technical Information (OSTI), 2009. http://dx.doi.org/10.2172/972867.
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Paterek, J. Robert. L51963 Environmental Benign Mitigation of Microbiologically Influenced Corrosion (MIC). Pipeline Research Council International, Inc. (PRCI), 2002. http://dx.doi.org/10.55274/r0011299.
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The objective is to develop and evaluate environmental benign agents or products that are effective in the prevention, inhibition, and mitigation of microbially influenced corrosion (MIC) on the internal surfaces of metallic natural gas pipelines. The goal is one or more products that can be applied to maintain the structure and dependability of the natural gas infrastructure. The technical approach for this year has been to evaluate a number of methods to fractionate and concentrate the components found in the pepper extracts. The separation methods considered include size exclusion chromatography, hygroscopic and hydrophobic extraction with HPLC fractionation and analysis; preparative HPLC; and other methods based on the chemical class of compounds to be evaluated. The first classes to be studied are: terpenoids; phenolics; fatty metabolites; alkaloids; and other products of secondary metabolism in plants. Other methods to be reviewed as needed include: planar chromatography; supercritical water and CO2 extraction; and ion-exchange methods. A review of the patent literature and scientific databases found no evidence that any of the potential products have been patented, indicating potential for establishment of a strong intellectual property position. The work plan for the continuation of specific tasks of this project for two additional years was completed and accepted for funding. Laboratory testing protocols for control of biofilm formation and/or biocidal activities for both aerobic and anaerobic microorganisms known to support MIC were codified.