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| Registros recuperados: 15 | |
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| TERAO, D.; SASAKI, F. F. C.; NECHET, K. de L.; FRIGHETTO, R. T. S.; KONDA, E. T.. |
| A podridão peduncular em mamão é fator limitante na comercialização, principalmente para exportação. Os objetivos do presente trabalho foram definir doses de luz ultravioleta C (UV-C) que inibem a germinação de esporos dos fungos do complexo causador da podridão peduncular, bem como avaliar doses de UV-C no controle da doença nos frutos. Suspensões de esporos foram irradiadas com doses variando de 0,25 a 2,00 kJ m -2 plaqueadas e após 72h avaliou-se a inibição na germinação pela contagem de Unidade Formadora de Colônias (UFC). Em teste in vivo irradiou-se a região peduncular do fruto com doses de 0,5 a 2,0 kJ m -2 . Após irradiados, os mamões foram armazenados durante sete dias em câmara fria e oito dias em temperatura ambiente, avaliando-se, diariamente,... |
| Tipo: Folhetos |
Palavras-chave: UV-C; Doença pós-colheita; Doença de Planta; Mamão; Podridão Peduncular; Raio Ultravioleta; Irradiação Luminosa; Papayas; Postharvest diseases; Foot rot (plant); Ultraviolet radiation; Physical control. |
| Ano: 2019 |
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1111457 |
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| Hernando, M.P.. |
| The increments in the ultraviolet radiation B (RUVB, 280-320 nm) resultants of the destruction of the ozone layer affect diverse echo-physiologic aspects of the marine phytoplankton. On this study were compared the responses of phytoplankton from an ambient Sub-Antarctic (Channel Beagle, 54º 52´S, 68º 18´W) and another Antarctic (Potter Cove, 62º 14´S, 58º 38´W) to the ultraviolet radiation (RUV). The decrease of the photosynthesis on short term (hours) was observed in both places, however inhibition thresholds were present. In the Beagle Channel, these were for RUVB and ultraviolet radiation A (RUVA, 320-400 nm), respectively, 0,2 and 6,2 Wm-2 for communities with more than 70% diatoms and 0,45 and 14,2 Wm-2, respectively, for communities with more than... |
| Tipo: Theses and Dissertations |
Palavras-chave: Phytoplankton; Photosynthesis; Ultraviolet radiation; Vertical mixing; Taxonomy; Phytoplankton; Taxonomy; Photosynthesis; Ultraviolet radiation; Http://aims.fao.org/aos/agrovoc/c_13344; Http://aims.fao.org/aos/agrovoc/c_7631; Http://aims.fao.org/aos/agrovoc/c_5812; Http://aims.fao.org/aos/agrovoc/c_8046. |
| Ano: 2008 |
URL: http://hdl.handle.net/1834/2868 |
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| Daloso, Danilo de Menezes; UFV; Holsback-Menegucci, Zildamara dos Reis; UFMS; Santiago, Etenaldo Felipe; UFMS. |
| Neste estudo, analisaram-se os efeitos da radiação UV-C sobre o desenvolvimento de folhas de Rapanea ferruginea. Plantas jovens foram selecionadas com seis meses de idade identificando-se as folhas já diferenciadas do 3º, 4º, 6º, 8º e 9º nó. Posteriormente, as plantas foram divididas em três grupos e submetidas à radiação UV-C por 30, 60 ou 120 min. seguidos. Para o estudo anatômico, foram utilizadas técnicas usuais de corte e coloração. As análises morfométricas foram realizadas determinando-se três pontos ao longo da nervura central da folha, medindo-se das bordas esquerda (E) e direita (D) até cada um desses pontos. Determinaram-se também os desvios de simetria, o comprimento e a largura máxima do limbo, submetendo os valores à Anova e ao teste de Tukey... |
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Palavras-chave: 2.00.00.00-6 Ciências Biológicas estresse; Radiação ultravioleta; Folhas; Desvio de simetria; Escalas de observação Botânica stress; Ultraviolet radiation; Leaves; Symmetry deviation; Scales of observation. |
| Ano: 2009 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/861 |
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| FIGUEROA,FÉLIX L.; VIÑEGLA,BENJAMÍN. |
| The effects of solar ultraviolet (UV) radiation during daily cycles on photosynthesis and two key enzymes involved in carbon incorporation, the carbonic anhydrase, and in inorganic nitrogen reduction, the nitrate reductase, of macroalgae from southern Spain are presented. During daily cycles, photoinhibition in several intertidal macroalgae, expressed as decrease in the effective quantum yield from the morning to noon time, was linearly dependent on the daily integrated irradiance. However, recovery, expressed as the increase in the effective quantum yield from noon to the afternoon, presented a different pattern; full recovery was found below daily integrated irradiance of 1.0 x10(4) kJ m-2. However, recovery reached only 50 % at higher irradiances. The... |
| Tipo: Journal article |
Palavras-chave: Carbonic anhydrase; Chlorophyll fluorescence; Effective quantum yield; Nitrate reductase; Ultraviolet radiation. |
| Ano: 2001 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2001000200003 |
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| García,E.; Alpízar,A.; Fajardo,R.; Córdova,D.; Pérez,L.; Martínez,S.. |
| ABSTRACT A retrospective and cross-sectional study of canine tumors was performed in the capital of State of Mexico from 2002-2016. Since then, 393 tumors were remitted. Descriptive epidemiology was made from all data: breed, age, sex, and tumor features. Then the risk association between cutaneous and non-cutaneous tumors with variables such as sex, breed, and age were analyzed through an exact Fisher test and Odds ratio. In addition, some characteristics of the canine population were studied under a survey. Of all tumors, skin tumors were the most frequent (59.0%). The group of tumors related to ultraviolet radiation was the most common (15.1%). The frequency of tumors in females was 53%, nevertheless, males had more risk to develop cutaneous tumors... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Dog; Tumors; Epidemiology; Skin tumors; Ultraviolet radiation. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352019000401085 |
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| Silva,Cleuber Antonio de Sá; Andrade,Nélio José de; Soares,Nilda de Fátima Ferreira; Ferreira,Sukarno Olavo. |
| Efficiency of ultraviolet (UV) radiation in reducing the cell number of Staphylococcus aureus ATCC 25923 and Escherichia coli K-12 adhered to low-density polyethylene (LDPE) films was evaluated. The microorganisms were let to adhere to the surface of LPDE bags for 12h at 18ºC, and then submitted to UV radiation at an intensity 196 µW.cm-2, 254nm, for 2 seconds. Staphylococcus aureus was less resistant to UV radiation than E. coli, and the efficiency increased with the increase of the concentration of microbial suspension. After 1500 hours of use the UV radiation intensity of the lamp was reduced from 288 to 78 µW.cm-2, and the higher decrease occurred in the first 100 hours of use. Also, the efficiency of the UV radiation decreased after 1500 hours of use.... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Bacterial adhesion; Ultraviolet radiation; Low-density polyethylene; Atomic force microscopy. |
| Ano: 2003 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822003000200017 |
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| Canuto,K.S.; Sergio,L.P.S.; Guimarães,O.R.; Geller,M.; Paoli,F.; Fonseca,A.S.. |
| Low-level lasers are used at low power densities and doses according to clinical protocols supplied with laser devices or based on professional practice. Although use of these lasers is increasing in many countries, the molecular mechanisms involved in effects of low-level lasers, mainly on DNA, are controversial. In this study, we evaluated the effects of low-level red lasers on survival, filamentation, and morphology of Escherichia colicells that were exposed to ultraviolet C (UVC) radiation. Exponential and stationary wild-type and uvrA-deficient E. coli cells were exposed to a low-level red laser and in sequence to UVC radiation. Bacterial survival was evaluated to determine the laser protection factor (ratio between the number of viable cells after... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: DNA; Escherichia coli; Laser; Ultraviolet radiation. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2015001000012 |
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| Ellner, S. |
| A brief discussion of the physics involved in the destruction of micro organisms by exposure to 2537A of UV energy: UV dose required for destruction of various micro organisms in a dynamic UV reactor (Bio Assay). History of UV design for shellfish depuration: Kelly Purdy Overhead design, Closed channel reactore, Open channel horizontal reactors, Open channel vertical reactors. Factors which effect UV performance: Chemical make up of water-coefficient of absorption, Physical make up of water-turbidity and Color impact, Overall UV transmission limits for effective disinfection. Discussion of the U.S. Public Health Service: effects of color, turbidity, and bacterial densities on UV performance. Impact of temperature on UV lamp performance. Impact of coating... |
| Tipo: Text |
Palavras-chave: USA Coasts; Bivalvia; Marine molluscs; Storage effects; Ultraviolet radiation; Shellfish culture. |
| Ano: 1992 |
URL: http://archimer.ifremer.fr/doc/1992/acte-1630.pdf |
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| Klein,Fátima Rosane S.; Reis,Andressa; Kleinowski,Alítcia M.; Telles,Renata T.; Amarante,Luciano do; Peters,José A.; Braga,Eugenia Jacira B.. |
| ABSTRACT Ultraviolet B radiation has been described as a potential elicitor agent of the synthesis of secondary metabolites in plants. Thus, the present study aimed to investigate the production of betalains and total flavonoids, as well as the antioxidant activity, of Alternanthera sessilis, A. brasiliana, A. tenella and A. philoxeroides exposed to different periods of UV-B radiation (280-315 nm). Plants of these four species were exposed to UV-B radiation for 0, 2, 4, 6, and 8 hours, which amounts to 0, 10, 20, 30, and 40 J cm−2 of radiation, respectively. Significant increases in betacyanin and betaxanthin levels were observed in A. sessilis and A. brasiliana during the period of UV-B exposure, while no differences were observed for the others species.... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Abiotic elicitor; Antioxidants; Flavonoids; Medicinal plants; Pigments; Ultraviolet radiation. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062018000400615 |
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| Registros recuperados: 15 | |
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