Academic literature on the topic 'Microorganisms – Counting'
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Journal articles on the topic "Microorganisms – Counting"
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KANEKO, Seiichi. "Counting Method of Microorganisms." NIPPON SHOKUHIN KOGYO GAKKAISHI 38, no. 6 (1991): 570–74. http://dx.doi.org/10.3136/nskkk1962.38.570.
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Garcia Arnal Barbedo, Jayme. "An Algorithm for Counting Microorganisms in Digital Images." IEEE Latin America Transactions 11, no. 6 (December 2013): 1353–58. http://dx.doi.org/10.1109/tla.2013.6710383.
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Martineli, Thaís Mioto, Oswaldo Durival Rossi Junior, Natacha Deboni Cereser, Marita Vedovelli Cardozo, Cristianne Lino Fontoura, and Silvia Helena Venturoli Perri. "Microbiological counting in lamb carcasses from an abattoir in São Paulo, Brazil." Ciência Rural 39, no. 6 (September 2009): 1836–41. http://dx.doi.org/10.1590/s0103-84782009000600030.
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The consumption of lamb meat in Brazil has increased in the last years but little information about the microbiological quality of this product is available. To evaluate the hygienic-sanitary conditions of lamb carcasses, the quantification of microorganism populations indicators (mesophiles and psychrotrophs; total and thermotolerant coliforms; Escherichia coli; moulds and yeasts) and the pathogenic microorganisms indentification (Salmonella sp. and Listeria spp.) were performed. A total of 60 lamb carcasses were sampled from one abattoir in São Paulo. Swab samples were collected from three points (forequarter, back and hindquarter) on the muscle surface after carcasses final washing. Statistical analysis consisted of descriptive evaluation of the results whose counts were grouped by intervals of microorganism populations. Counts ranged from 1.0 x 10¹ to 8.0 x 10(4) colony-forming unit cm-2 (CFU cm-2) for mesophiles; 1.0 x 10(0) to 4.4 x 10(4)CFU cm-2 for psychrotrophs; < 1.0 x 10(0) to 4.4 x 10(4)CFU cm-2 for moulds and yeasts; < 0.3 to > 32.0 most probable number/cm² (MPN cm-2) for total and thermotolerant coliforms and Escherichia coli. Salmonella sp. and Listeria spp. were not found in any of the carcasses. Most carcasses presented low counts for all microorganisms. Overall results may be explained by the small size of the industry where the study was taken. Results suggest that good microbiological quality lamb meat is possible to be obtained, but improvement in hygienic-sanitary conditions is still required.
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Boisen, Flemming, Niels Skovgaard, Steen Ewald, Gunnar Olsson, and Gun Wirtanen. "Quantitation of Microorganisms in Raw Minced Meat Using the Direct Epifluorescent Filter Technique: NMKL Collaborative Study." Journal of AOAC INTERNATIONAL 75, no. 3 (May 1, 1992): 465–73. http://dx.doi.org/10.1093/jaoac/75.3.465.
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Abstract Fourteen Nordic laboratories participated In an Interlaboratory study of microorganisms In raw minced meat. After 2 preliminary collaborative evaluations of 20 and 6 prepared direct epifluorescent filter technique (DEFT) slides, the equipment and the counting technique were adjusted and standardized. In the following third and final trial, the laboratories examined 10 samples in duplicate. A special model was developed for homogenlzatlon, preservation, and transport of raw minced meat within 24 h. Test microorganisms were those present naturally In the meat. The participating laboratories received Identical samples in duplicate at 10 counting levels. The results Indicated a coefficient of variation of 15% by Interlaboratory counting of 26 prepared DEFT slides. By examining samples of raw minced meat for microorganisms showing any degree of orange fluorescence, the repeatability and the reproducibility were 0.41 and 0.78, respectively. The repeatability standard deviation (sr) was0.14, and the reproducibility standard deviation (SR) was 0.27. The study demonstrated that DEFT Is a dependable method for quantitation of microorganisms in raw minced meat. Precision of DEFT was in agreement with Nordic Committee on Food Analysis standard deviation values used In the Nordic countries for plate-count quality control.
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Li, Mengqiu, Praveen C. Ashok, Kishan Dholakia, and Wei E. Huang. "Raman-Activated Cell Counting for Profiling Carbon Dioxide Fixing Microorganisms." Journal of Physical Chemistry A 116, no. 25 (March 5, 2012): 6560–63. http://dx.doi.org/10.1021/jp212619n.
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Condón, Santiago, Rosa Oria, and Francisco J. Sala Trepat. "Heat resistance of microorganisms: an improved method for survival counting." Journal of Microbiological Methods 7, no. 1 (November 1987): 37–44. http://dx.doi.org/10.1016/0167-7012(87)90006-6.
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P, Kalavathi, and Naganandhini S. "A Hybrid Method for Automatic Counting of Microorganisms in Microscopic Images." Advanced Computing: An International Journal 7, no. 1/2 (March 31, 2016): 51–60. http://dx.doi.org/10.5121/acij.2016.7206.
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Parat, S. "Contribution of particle counting in assessment of exposure to airborne microorganisms." Atmospheric Environment 33, no. 6 (March 1999): 951–59. http://dx.doi.org/10.1016/s1352-2310(98)00218-0.
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Hu, H., M. Xie, Y. Yu, and Q. Zhang. "Transgenic Bt cotton tissues have no apparent impact on soil microorganisms ." Plant, Soil and Environment 59, No. 8 (July 31, 2013): 366–71. http://dx.doi.org/10.17221/213/2013-pse.
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The impact of transgenic Bacillus thuringiensis (Bt) cotton residues on soil microorganism communities was investigated. Leaves of three different varieties of transgenic Bt cotton and their near-isogenic lines were placed in soil and the numbers of indigenous soil microorganisms were measured with cultivation-dependent approaches under laboratory conditions. The soil samples were collected after 7, 14, 21, 28, 56 and 84 days of incubation. Numbers of bacteria, actinomycetes and fungi in the soil were measured by counting colony forming units after incubation on appropriate medium. Overall, although there were differences in bacteria, actinomycetes and fungi population between soil amended with Bt and non-Bt cotton throughout the whole incubation in three experiments, these differences were transient and not persistent from one sampling stage to the next. These results suggest that Bt-transgenic cotton tissues have no apparent impact on soil microorganism population.
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Ozer, Z., C. Ozturk, A. A. Altunkan, I. Cinel, and U. Oral. "Inhibition of Bacterial Growth by Lignocaine in Propofol Emulsion." Anaesthesia and Intensive Care 30, no. 2 (April 2002): 179–82. http://dx.doi.org/10.1177/0310057x0203000209.
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Contamination of propofol, in an emulsion formulation, has been associated with infective complications. Local anaesthetics, some of which are known to have antibacterial properties, are frequently added to the solution to reduce pain on injection. We examined the growth rates of E. coli, S. aureus, S. epidermidis and P. aeruginosa in propofol with and without lignocaine 0.1%–2% after incubation for 2, 5 and 24 hours at 37°C. Growth of microorganisms in each solution was compared by counting the number of colony forming units (CFU). Propofol supported the growth of all microorganisms. An increase in the number of CFUs was observed in all drug combinations 2, 5 and 24 hours after inoculation except for S.aureus (P<0.05). No difference was found in CFU numbers between 2 and 5 hours for this microorganism. With E.coli, a significant decline in colony counts was observed in mixtures of 1% and 2% lignocaine (P<0.05). With the other microorganisms only 2% lignocaine showed a significant reduction in the number of CFUs (P<0.05). We conclude that lignocaine in recommended clinical doses (0.05%–0.1%) did not exhibit adequate antibacterial activity to prevent infective complications.
Dissertations / Theses on the topic "Microorganisms – Counting"
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Thiebaud, Maribel Alvarez de. "Estimation of viable cell count by modern and improved methods." Thesis, Kansas State University, 1985. http://hdl.handle.net/2097/9883.
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Mattioda, Fernanda. "Influência do processo de qualificação para melhoria da qualidade do leite na pequena propriedade rural." Universidade Tecnológica Federal do Paraná, 2012. http://repositorio.utfpr.edu.br/jspui/handle/1/598.
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CapesA baixa qualidade do leite oriundo de propriedades rurais pertencentes ao Sistema de Agricultura Familiar demanda informações e tecnologias que proporcionem melhoria na qualidade da matéria-prima. Diante do elevado número de agricultores familiares no país, os quais não têm acesso às informações sobre produção do leite com qualidade, torna-se necessário desenvolver e aplicar processos de qualificação em propriedades rurais. Portanto, o presente estudo utiliza o método de Unidade de Referência, e objetiva avaliar a influência do processo de qualificação para a melhoria de qualidade do leite na pequena propriedade rural. O estudo foi dividido em três etapas: a primeira foi a seleção de Unidades de Referência e a sua caracterização através da aplicação de questionário e análise dos indicadores de qualidade do leite, gordura, proteína, lactose, Contagem Bacteriana Total e Contagem de Células Somáticas; a segunda etapa foi a implantação de Unidades de Referência nas propriedades e transmissão de informações e tecnologias através de treinamentos higiênico-sanitários; e por último a avaliação do processo de qualificação por meio das análises de indicadores de qualidade do leite, feitas durante os 12 meses de estudo. Para avaliação estatística dos resultados utilizou-se a análise de variância (ANOVA), identificação de outiliers e Teste de Tukey, através do programa Minitab 16. Como resultados desta avaliação, os valores de gordura, proteína e lactose nas amostras de leite permaneceram dentro dos limites estabelecidos pela legislação vigente. E assim como em outras pesquisas, os valores de gordura foram os que mais variaram em relação aos outros componentes do leite. No que diz respeito aos valores de Contagem de células somáticas, 29% dos valores ficaram acima dos limites estabelecidos pela legislação, variando de 1 a 27,47x10 5CS/mL, e para os valores de Contagem bacteriana total, 3,5% das amostras ficaram dentro do limites, ao longo do estudo. Ambos os parâmetros de qualidade do leite (CCS e CBT) não apresentaram variação significativa ao longo do estudo, isto pode ser explicado por outros fatores que interferiram na pesquisa, como a estação do ano. Os agricultores familiares absorveram todas as informações repassadas no treinamento higiênico-sanitário e passaram a aplicar todas as técnicas de manejo para evitar e detectar doenças no rebanho , isto foi verificado com a aplicação de questionário aos produtores. Portanto, vale ressaltar, que ainda é inexistente uma cultura organizacional que proporcione através de metodologias participativas, o avanço do conhecimento para o desenvolvimento local.
The low quality of milk obtained of family farms needs information and technologies that provide this improvement in the quality of raw material. Given the large number of family farmers in the country, which do not have access to information on production of quality milk, it becomes necessary to develop and implement procedures for qualification in these farms. Therefore, this study uses the methodology of Reference Unit, able to inform and train farmers on the minimum requirements for the production of quality milk. The methodology to evaluate the influence of the qualification process for improving the quality of milk in small farms, the study was divided into three stages: the first was the selection of reference units and its characterization through a questionnaire and analysis of the quality of milk, as fat, protein, lactose, total bacterial count and Somatic Cell Count; and the second step was the implementation of the Reference Units in farms and the transmission of information and technologies through training hygienic -sanitary, and final evaluation of the qualification process through the analysis of indicators of quality of milk, made during the 12 month study. The statistical evaluation of results was done using analysis of variance (ANOVA), identification of outiliers and Tukey's test, using the program Minitab 16. As a result of this evaluation, the values of fat, protein and lactose in milk samples resulted within the limits established by law. And as in other studies, the values of fat were the most varied in relation to other components of milk. With regard to the values of somatic cell count, 29% of values were above the limits established by legislation, ranging from 1 to 27.47 x105 CS / mL, and the values of total bacterial count, 3.5% of samples are within the limits throughout the study. Both parameters of milk quality (SCC and CBT) did not change significantly over the months of study, this can be explained by other factors that influenced the research, how the season. Family farmers absorbed all the information passed in higienic sanitary training and have implemented all management techniques to prevent and detect disease in the herd, this was checked with a questionnaire to producers. Therefore, it is worth mentioning, which is still lacking an organizational culture that provides using participatory methods, the advancement of knowledge for local development.
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Lodéa, Patrícia. "Contagem bacteriana em filé de peito de frango após o sistema de resfriamento." Universidade Tecnológica Federal do Paraná, 2017. http://repositorio.utfpr.edu.br/jspui/handle/1/2171.
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Atualmente, o Brasil está entre os principais produtores mundiais de carne de frango e, também, o principal exportador desta fonte proteica. A indústria avícola tem investido conhecimento e recursos no controle microbiológico de seus produtos, buscando garantir a segurança dos alimentos. Assim, este trabalho teve como objetivo quantificar Escherichia coli e Staphylococcus aureus, e determinar a ocorrência de Listeria monocytogenes em peito de frango após o sistema de resfriamento a 4 e 7 °C. O produto foi obtido em um abatedouro do Oeste Catarinense e as análises microbiológicas foram realizadas segundo protocolos internacionais. O pH e atividade de água (Aa) também foram avaliados. Para carcaças que saíram a 4 °C, 95,83 e 97,92 % das amostras apresentaram contagem abaixo de 10 UFC/g para E. coli e S. aureus, respectivamente. Quando resfriadas à 7 °C, 92,71 e 86,46 % apresentaram este nível de contagem. As maiores contagens de E. coli e S. aureus foram 40 e 70 log UFC/g, respectivamente. L. monocytogenes não esteve presente em nenhuma das amostras avaliadas. Os resultados sugeriram que as temperaturas do sistema de resfriamento não influenciaram na contagem microbiológica. Já pH e Aa diferiram estatisticamente quando o sistema de resfriamento operou a 4 ou 7 ºC, porém não influenciou os resultados microbiológicos.Currently, Brazil is among the world's leading producers of chicken meat and has also become the main exporter of this protein source. The poultry industry has invested knowledge and resources for the microbiological control of its products, seeking to ensure food safety. Thus, the objective of this study was to quantify Escherichia coli and Staphylococcus aureus, and to determine the occurrence of Listeria monocytogenes in chicken breast after the cooling system at 4 and 7 ° C. The product was obtained from a slaughterhouse in west of Santa Catarina and the microbiological analyzes were performed according to international protocols. The pH and water activity were also evaluated. For carcasses that left at 4 ° C, 95.83 and 97.92 % of the samples presented counts below 10 CFU/g for E. coli and S. aureus, respectively. When cooled to 7 ° C, 92.71 and 86.46 % presented this level of counting. The highest counts of E. coli and S. aureus were 40 and 70 log CFU/g, respectively. L. monocytogenes was not present in any of the samples evaluated. The results suggested that the cooling system temperatures did not influence microbiological counting. The pH and water activity (aw) differed statistically when the cooling system operated at 4 or 7 ºC, ho wever did not influence microbiological results.
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Baptista, Filipa Alexandra Lourenço. "Evaluation of the applicability of an electronic device in counting and chromatic differentiation in ecotoxicology assays." Master's thesis, Universidade de Aveiro, 2017. http://hdl.handle.net/10773/22686.
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Mestrado em Biologia AplicadaO presente estudo foi realizado no âmbito da Biologia Aplicada tendo como objetivo geral a avaliação da aplicabilidade de um novo dispositivo (D counter) em ensaios biológicos no âmbito da Ecotoxicologia. O trabalho desenvolvido apresentou três fases distintas: uma fase inicial com adaptação aos comandos e funcionalidades do novo equipamento, uma segunda fase com aplicação da metodologia clássica em paralelo com a abordagem otimizada pelo equipamento D counter, e uma terceira fase com a execução de um teste ecotoxicológico, usando unicamente as potencialidades oferecidas pelo D counter, focando-se principalmente na contagem de caracterização cromática de organismos. Avaliações preliminares acerca da aplicabilidade do D counter em contar e diferenciar cromaticamente microrganismos, em testes ecotoxicológicos, foram apresentadas na SETAC2017 (Bruxelas). O resumo estendido encontra-se no capitulo II, onde estão descritas as principais funcionalidades do D counter, cujo objetivo se foca na simplificação e automatização dos testes ecotoxicológicos, por forma a minimizar problemas inerentes ao método clássico de contagem e caracterização de organismos. Grande parte dos testes com Daphnia magna requerem a contagem e medição de elevado número de organismos, o que pode causar erros humanos e prejudicar a acuidade visual do técnico. Desta forma o procedimento de trabalho com o D counter acrescenta objetividade e precisão, economizando tempo e diminuindo o tempo de exposição ao químico testado. A segunda fase do estudo pretendeu avaliar o D counter em estudos biológicos clássicos. Para tal, comparou-se a performance deste com a abordagem tradicional, através de um ensaio crónico de 21 dias com D. magna, por forma a avaliar parâmetros como a reprodução e o crescimento dos organismos, usando os dois métodos, na ausência de contaminante. Numa terceira fase aplicou-se a nova metodologia a um teste crónico, onde foram estudados os efeitos combinados da variação da dureza da água e amónia em D. magna. Os parâmetros estudados foram a reprodução e o crescimento dos organismos, com base nos resultados obtidos no D counter. De uma forma global, este estudo demonstrou que o novo equipamento não exibe diferenças significativas em comparação com o método clássico (p = 0,822), mostrando-se assim capaz de substituir a metodologia atualmente utilizada. Dados do D counter, mostram que a dureza e a amónia demonstraram ser parâmetros que afetam o tamanho e reprodução dos organismos. Meio com valor mais baixo de dureza resulta em organismos com menor tamanho, enquanto o oposto se observou no meio com dureza mais elevada. Contrariamente ao esperado, concentrações mais altas de cloreto de amónia (12 e 20 mg/l) apresentaram maiores taxas de reprodução em comparação com o controlo e concentração mais baixa de cloreto de amónia (2mg/l). Este estudo demonstra e valida a aplicação de novas metodologias na área da ecotoxicologia, podendo abrir novas potencialidades e evoluções do equipamento no futuro. resumo
The present study was developed in the ambit of Applied Biology aiming the evaluation of an innovative device applicability in Ecotoxicology bioassays. The study was developed in three distinct phases: a first phase with adaptation to the commands and functionalities of the new equipment (D counter); a second phase using both classical methodology and the innovative approach (provided by the new device) in bioassays; and a third phase performing a standard bioassay in Ecotoxicology, only assisted by the functionalities available from the D counter, mainly in organism counting and chromatic characterization. Preliminary results evaluating the applicability of D counter in counting and chromatic differentiation in Ecotoxicology bioassays were presented at SETAC2017 (Brussels). The study presented to the conference is included in chapter II as an extended abstract, enhancing D counter main features simplifying and automating ecotoxicological tests, minimizing many problems inherent to the classical method of counting and characterizing organisms. Many Daphnia magna testing requires the counting and measurement of large amounts of organisms, which can lead to human error and even impair the visual acuity of the technician. The working procedure with D counter adds objectiveness and accuracy, saves time, and also reduces the exposure period to the chemical tested. A second phase of the present study was to evaluate D counter in classical bioassays tests, comparing D counter performance and the traditional approach, through an essay with D. magna, considering a chronic test of 21 days, and evaluating parameters such as reproduction and growth of the organisms using both procedures in the absence of contamination. In a third phase, the new methodology was applied to chronic test, where the combined effects of the variation of water hardness and ammonia in D. magna were studied. The studied parameters were reproduction and growth of the organisms exposed to combined effects, considering data only acquired and provided by the new device D counter. Overall, this study demonstrated that the new equipment does not exhibit significant differences, when compared to the classical method (p = 0,822), thus being able to assist or even replace the current counting methodology. D counter data showed that water hardness and ammonia have shown to be parameters that affect the size and reproduction of organisms. Medium with lower hardness results in organisms with smaller size, while the opposite was observed in the medium with higher water hardness. Unexpectedly, higher concentrations of ammonium chloride (12 and 20 mg/l) presented higher reproduction rates, compared to the control and lower concentration of ammonium chloride (2mg/l). This study presents and validates the application of new methodologies in ecotoxicology, being able to open new potentialities and evolutions of the equipment in the future. abstract
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Luz, Leandro Vinícius da. "CARACTERIZAÇÃO CITOGENÉTICA E DE CRESCIMENTO DE Schinus terebinthifolius Raddi." Universidade Federal de Santa Maria, 2013. http://repositorio.ufsm.br/handle/1/4866.
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Coordenação de Aperfeiçoamento de Pessoal de Nível SuperiorTropical forests play vital role in maintaining the stability and quality of the environment, protecting the soil and water resources, conserving the biodiversity, protecting cultural and recreational values, which contribute to improving the quality of life of the population. Being the germplasm of forest species a wealth to be used and preserved. Schinus terebinthifolius (Anacardiaceae) has medicinal, alimentary and ecological properties, besides being destined for the recomposition of degraded areas of permanent preservation. However, there are few studies on the cytogenetics characterization and promotion growth of this species. Thus, aiming for conservation and sustainable use, the objective is to characterize cytogenetically this species, assess the quality of the seeds S. terebinthifolius from individuals of different accessions of populations of Rio Grande do Sul, as well as, to evaluate the effect of the interaction of Trichoderma spp. on the contamination and in vitro germination and ex vitro vegetative growth of S. terebinthifolius. For the determination of chromosome number were used tissues of root tips. In the germination study, the parcels with seeds were kept in a climatic chamber with a photoperiod of 16 hours at the temperature of 20°C (+/- 2°C). To the study the interaction between S. terebinthifolius and Trichoderma spp. were evaluated the isolates TSM1 and TSM2 of Trichoderma viride, 2B2 and 2B22 of Trichoderma harzianum for the in vitro experiment, through the cellophane technique and the ex vitro experiment was conducted in a greenhouse, where were evaluated the effects of the isolates 2B2 and 2B22 and the commercial product Trichodermil®, all in the presence and absence of growth regulator Stimulate®. It is concluded that the chromosome number of the species S. terebinthifolius determined for 22 accessions collected in Rio Grande do Sul is 2n = 28, indicating that there isn't intraspecific variability. The quality of the seeds of S. terebinthifolius shows great heterogeneity among the different accessions collection. With the technique of in vitro cellophane, all four isolates of Trichoderma spp. tested are efficient in controlling fungal contamination of seeds. In ex vitro cultivation, the difference was significant growth in leaf area index for strain 2B2
As florestas tropicais desempenham função vital na manutenção da estabilidade e qualidade do meio ambiente, protegem o solo e os recursos hídricos, conservam a diversidade biológica, protegem os valores culturais e recreativos, que contribuem com a melhoria da qualidade de vida da população. Sendo o germoplasma de espécies florestais uma riqueza a ser utilizada e preservada. Schinus terebinthifolius (Anacardiaceae) possui propriedades medicinais, alimentícias e ecológicas, além de serem destinados à recomposição de áreas degradadas de preservação permanente. No entanto, ainda são poucos os estudos sobre a caracterização citogenética e promoção de crescimento dessa espécie. Assim, visando à conservação e a utilização sustentável, objetiva-se caracterizar citogeneticamente esta espécie, avaliar a qualidade das sementes de S. terebinthifolius provenientes de indivíduos de diferentes acessos do Rio Grande do Sul, bem como, avaliar o efeito da interação de Trichoderma spp. na contaminação e germinação in vitro e no crescimento vegetativo ex vitro de S. terebinthifolius. Para a determinação do número de cromossomos, foram utilizados tecidos de pontas de raízes. No estudo de germinação, as parcelas com as sementes foram mantidas em câmara climática com fotoperíodo de 16 horas à temperatura de 20°C (+/- 2°C). Para o estudo da interação entre S. terebinthifolius e Trichoderma spp. foram avaliados os isolados TSM1 e TSM2 de Trichoderma viride, 2B2 e 2B22 de Trichoderma harzianum para o experimento in vitro, através da técnica do papel celofane e o experimento ex vitro foi realizado em casa de vegetação, onde se avaliou os efeitos dos isolados 2B2 e 2B22, e o produto comercial Trichodermil®, todos na presença e ausência do regulador de crescimento Stimulate®. Conclui-se que o número de cromossomos da espécie S. terebinthifolius determinado para 22 acessos coletados no Rio Grande do Sul é de 2n = 28, indicando que não ocorre variabilidade intraespecífica. A qualidade das sementes de S. terebinthifolius apresenta grande heterogeneidade entre os diferentes acessos de coleta. Com a técnica in vitro do papel celofane, os quatro isolados de Trichoderma spp. testados são eficientes no controle da contaminação fúngica das sementes. No cultivo ex vitro, observou-se diferença significativa de crescimento no índice de área foliar para o isolado 2B2;
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Lopes, de Oliveira Veturia. "Intéractions entre les micro-organismes du sol et l'établissement de la symbiose ectomycorhizienne chez le hêtre (fagus silvatica L. ) avec hebeloma crustuliniforme (bull. Ex saint-amans) quel. Et paxillus involutus batsch. Ex fr." Nancy 1, 1988. http://www.theses.fr/1988NAN10174.
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Mise en évidence de différences de réceptivité entre cinq sols forestiers du nord-est de LA France. Effet global, et effets des composants individuels des communautés microbiennes rhizosphériques ou non des sols brun mésotrophe et brun acide sur la mycorhization du hêtre. Évaluation des possibilités offertes par les micro-organismes auxiliaires pour le contrôle biologique de la mycorhization
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Lee, Yih. "Application of the adhesive tape method for microbial sampling on various meat surfaces." 1985. http://hdl.handle.net/2097/27480.
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Wang, George Ing-Jye. "Feasibility of using catalase activity as an index of microbial loads on food surfaces." 1985. http://hdl.handle.net/2097/27573.
Full textBooks on the topic "Microorganisms – Counting"
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International Commission on Microbiological Specifications for Foods. Microorganisms in foods. 2nd ed. Toronto: University of Toronto Press, 1988.
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Foods, International Commission on Microbiological Specifications for. Micro-organisms in foods: A publication of the International Commission on Microbiological Specifications for Foods (ICMSF) of the International Association of Microbiological Societies. 2nd ed. Toronto, Buffalo: University of Toronto Press, 1986.
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Giovanni, George Di, Microbial, and Disinfection By-Products Research Council (U. S.). Source Water Assessment: Variability of Pathogen Concentrations. Amer Water Works Assn, 2002.
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P, Heggers John, and Robson Martin C, eds. Quantitative bacteriology: Its role in the armamentarium of the surgeon. Boca Raton: CRC Press, 1991.
Find full textBook chapters on the topic "Microorganisms – Counting"
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Alef, K. "Enrichment, isolation and counting of soil microorganisms." In Methods in Applied Soil Microbiology and Biochemistry, 123–91. Elsevier, 1995. http://dx.doi.org/10.1016/b978-012513840-6/50019-7.
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C. Vasconcelos, Helena, Joao A. Lopes, Maria João Pereira, and Afonso Silva Pinto. "Fluorescence Behavior of Phytoplankton Blooms by Time-Correlated Single-Photon Counting (TCSPC)." In Fluorescence Methods for Investigation of Living Cells and Microorganisms. IntechOpen, 2020. http://dx.doi.org/10.5772/intechopen.93292.
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Alexander, Earl B., Roger G. Coleman, Todd Keeler-Wolfe, and Susan P. Harrison. "Animals, Fungi, and Microorganisms." In Serpentine Geoecology of Western North America. Oxford University Press, 2007. http://dx.doi.org/10.1093/oso/9780195165081.003.0011.
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Although plants are the major living components of terrestrial geoecosystems, other organisms are very important. Some animals move large amounts of soil, and many microoganisms promote the weathering of rocks and minerals in soils. Perhaps the greatest effects of animals, fungi, and microorganisms on geoecosystems are indirect through their effects on plants and plant communities. Mycorrhizal fungi are beneficial to plants in nutrient-limiting substrates where the fungi can scavenge phosphorous and nitrogen for plants. Many animals, from large ungulates (moose, elk, deer, etc.) to microscopic nematodes, graze on the leaves and roots of plants. Microorganisms cause many diseases in plants. A complete inventory of plant interactions with other organisms is virtually limitless. This chapter concentrates on organisms that live in serpentine soils, that live on ultramafic rocks, or that are dependent on plants that grow on serpentine soils. There have been few field investigations of living organisms, other than plants, on serpentine soils. Many of the investigations on animals, fungi, and microorganisms in serpentine soils of the western North America have been conducted on Jasper Ridge in San Mateo County, and some have been on Coyote Ridge in Santa Clara County and on the McLaughlin Reserve in Napa and Lake counties, California. Some investigations of animals and other organisms for which there are no published accounts relating to serpentine soils in western North America (e.g., termites) are cited from other areas. The associations of organisms with serpentine soils, whether utilization or avoidance, largely depend on the chemistry of the soil parent materials. Therefore, this chapter begins with a review of the effects of serpentine chemistry on living organisms. Organisms are about 50% or more water. Moss plants that are less than 50% water when desiccated can absorb much more water than their dry weights to increase their weights several fold within hours. About half of the biomass of living organisms that is not water is carbon. Other than water, carbon dominates the chemistry of all organisms. It forms large polymers that are far beyond the capabilities of other elements. Carbon dioxide in the atmosphere is the primary source of carbon in soils.
Conference papers on the topic "Microorganisms – Counting"
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Barbedo, Jayme Garcia Arnal. "Method for Counting Microorganisms and Colonies in Microscopic Images." In 2012 12th International Conference on Computational Science and Its Applications (ICCSA). IEEE, 2012. http://dx.doi.org/10.1109/iccsa.2012.23.
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Fang, Zhou, Cao Wenjun, Wu Zhi, and Wei Xin. "Microorganism Image Counting Based on Multi-threshold Optimization." In 2019 IEEE International Conference on Consumer Electronics - Taiwan (ICCE-TW). IEEE, 2019. http://dx.doi.org/10.1109/icce-tw46550.2019.8991924.
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