Biophysical Chemistry

Contains a report on a research project.National Institutes of Health (Grant RG-7803

Mechanism of Enzymatic Reactions

Contains research objectives.National Institutes of Health (Grant GM-07803

Amigos por natureza.

bitstream/item/128289/1/EDUFA-AMIGOS-NATUREZA.pdfIlustrações Leonardo Branco. Projeto Minibibliotecas

Segredos da Serra dos Macacos.

bitstream/item/128293/1/EDUFA-SERRA-MACACOS.pdf1. ed.Projeto Minibibliotecas

First record of a plasmodiophorid parasite in grapevine

In the context of an interdisciplinary project on grape pests and pathogens in Rheingau (Germany), the fine root system of grafted rootstocks has been screened for pathogenic fungi associated with root galls induced by grape phylloxera (Daktulosphaira vitifoliae (Fitch)). In several insect-induced galls, masses of resting spores of a plasmodiophorid could be seen. An additional selective screening revealed the occurrence of the plasmodiophorid parasite also in samples of gall-free rootlets: cortical cells of small necrotic areas were crowded with resting spores or other developmental stages of its life cycle. According to current taxonomic concepts, this plasmodiophorid could be identified as a member of the genus Sorosphaera Schroeter, resembling S. veronicae Schroeter. This is the first record of a plasmodiophorid parasite in grapevine

Potential probiotic approaches to control Legionella in engineered aquatic ecosystems

Opportunistic pathogens belonging to the genus Legionella are among the most reported waterborne-associated pathogens in industrialized countries. Legionella colonize a variety of engineered aquatic ecosystems and persist in biofilms where they interact with a multitude of other resident microorganisms. In this review, we assess how some of these interactions could be used to develop a biological-driven "probiotic" control approach against Legionella. We focus on: (i) mechanisms limiting the ability of Legionella to establish and replicate within some of their natural protozoan hosts; (ii) exploitative and interference competitive interactions between Legionella and other microorganisms; and (iii) the potential of predatory bacteria and phages against Legionella. This field is still emergent, and we therefore specifically highlight research for future investigations, and propose perspectives on the feasibility and public acceptance of a potential probiotic approach. Keywords: Legionella; antagonism; biofilm; competition; pathogen–host interaction; predation; probiotics; protozoa

Proceedings of the 21st Annual Meeting, Southern Soybean Disease Workers (March 6-8, 1994, Tulsa, Oklahoma)

Contents 1993-94 SSDW Committee Chairs 1993-94 SSDW Officers Graduate student competition Resistance of Soybean Cultivars in Maturity Group IV-VIII to Rotylenchulus reniformis. JJ Cornelius and GW Lawrence Evaluation of Susceptibility of Soybean to Red Crown Rot caused by Calonectria crotalariae in the Field. KD Kim, JS Russin, and JP Snow Contributed papers Soybean Disease Loss Estimate for the Southern United States During 1993, Table 1. Estimated percent Joss of soybean yields in 1993 to disease, Table 2. Estimated reduction of soybean yields in 1993 to disease, and Table 3. Southern states soybean disease loss estimate total in bushels and dollars, 1993. Compiled by JA Wrather Aerial Blight Associated with Delayed Maturity of Soybean. IA Fox, MA Blaine, and GL Sciumbato Relationship of Phytophthora Resistance to Soybean Yield. GL Sciumbato., FG Hancock, JA Fox, and D Boykin Effects of Long-Term Tillage Practices on Soil Populations of Microsclerotia of Macrophomina phaseolina. SR Kendig and JA Wrather Effect of Maturity Group, Growth Stage, and Planting Date on Progress of Sudden Death Syndrome of Soybean. JC Rupe and EE Gebur, Jr Additional Soybean Plant Introductions Resistant to Soybean Cyst Nematode. LD Young Frogeye Leaf Spot Control in Soybeans with Foliar-Fungicides. AY Chambers Interaction of the Root-Knot Nematode, Meloidogyne incognita, with Selected Weed Species Present in Soybean Fields in Louisiana. EC McGawley, JS Russin, and JL Griffin Population Development by Meloidogyne incognita and Heterodera glycines on Soybean Stressed by Weeds and Defoliation. JS Russin, EC McGawley, and LL Griffin Resistance to Rotylenchulus reniformis in Soybean. RT Robbins and L Rakes Treasurer\u27s report. GG Hammes Proceedings of the Southern Soybean Disease Workers are published annually by the Southern Soybean Disease Workers. Text, references, figures, and tables are reproduced as they were submitted by the authors. The opinions exposed by the participants at this conference are their own and do not necessarily represent the views of the Southern Soybean Disease Workers. Mention of trademark or propriety products in this Proceedings does not constitute a guarantee, warranty, or endorsement of that product by the Southern Soybean Disease Workers

Proceedings of the 23rd Annual Meeting, Southern Soybean Disease Workers (March 24-25, 1996, Biloxi, Mississippi)

Contents Business session Soybean Disease Loss Estimate for the Southern United States during 1995. JA Wrather Treasurer report. GG Hammes SSDW Committee Chairmen for 1995-1996 Graduate student papers Effects of Bacteria Associated with Heterodera glycines in Soybean Fields of Arkansas. TK Field, RD Riggs, and TL Hart Influence of Soybean Pest Complexes on Maturation of Soybean Looper, Pseudoplusia includens. CH Carter, JS Russin, EC McGawley, DJ Boethel, and JL Griffin Contributed papers Resistance to Cyst Nematode in PI 437654 and Hartwig Soybeans. SC Ananad Rotation with Soybean Cultivar Hartwig and Nonhost Crops for Management of the Soybean Cyst Nematode. SR Koenning and KR Barker Relationship of Yield to the Development of Sudden Death Syndrome. JC Rupe Further Evaluation of Date of Planting Effects on Severity of Soybean Stem Canker. AY Chambers Proceedings of the Southern Soybean Disease Workers are published annually by the Southern Soybean Disease Workers. Text, references, figures, and tables are reproduced as they were submitted by the authors. The opinions exposed by the participants at this conference are their own and do not necessarily represent the views of the Southem Soybean Disease Workers. Mention of trademark or propriety products in this proceedings does not constitute a guarantee, warranty, or endorsement or that product by the Southern Soybean Disease Workers

Proceedings of the 22nd Annual Meeting, Southern Soybean Disease Workers (February 20-22, 1995, St. Louis, Missouri)

Contents Business session Soybean Disease Loss Estimate for the Southern United States during 1994. JA Wrather Treasurer report. GG Hammes SSDW Committee Chairmen for 1994-1995 Graduate student papers Host preference of Rotylenchulus reniformis for weed species common to Louisiana soybean. CH Carter, EC McGawley, and JS Russin Development of an immunoassay for Heterodera glycines eggs. MJ Kennedy, JE Schoelz, TL Niblack, PA Donald Effects of delayed planting and host susceptibility on colonization of soybean by Calonectria crotalariae and development of red crown rot. PU Kuruppu, JS Russin, and EC McGawley Effects of long-term corn/soybean rotation on pathogenicity of Pythium populations on soybean. BQ Zhang and XB Yang Contributed papers Possible shift to more virulent Phytophthora races in Mississippi. GL Sciumbato and BL Keeling The relationship between trehalose content and dormancy of soybean cyst nematode, Heterodera glycines. JH Yen, AL Karr, TL Niblack, and WJ Weibold Fertilization effects on Sudden Death Syndrome (SDS) in soybeans. MA Newman, AY Chambers, and DD Howard Screening southern soybean cultivars for reaction to aerial blight. BG Harville, JS Russin, and RJ Habetz Comparison of continuous soybean, fallow, and rotation with sorghum-sudan grass hybrid for nematode control in a field infested with root-knot and soybean cyst nematodes. R Rodríguez-Kábana, DB Weaver, and EL Carden Recent progress in identifying soybean cultivars field tolerance of Macrophomina phaseolina. GS Smith and ON Carvil Major soybean diseases in Brazil. JT Yorinori Pre- and post-infection efficacy of benomyl for the control of stem canker of soybean. JC Rupe and CM Becton Comparison of continuous soybean and rotation with cotton for nematode control in a field infested with root-knot and soybean cyst nematodes. DB Weaver, R Rodríguez-Kábana, and EL Carden A rapid screening method for resistance to nematodes and soilborne pathogens using alginate films. N Kokalis-Burelle, N Martínez-Ochoa, DB Weaver, and R Rodríguez-Kábana Progress of a project to identify differential cultivars and races of Cercospora sojina. DV Phillips and HR Boerma Proceedings of the Southern Soybean Disease Workers are published annually by the Southern Soybean Disease Workers. Text, references, figures, and cables are reproduced as they were submitted by the authors. The opinions exposed by the participants at this conference are their own and do not necessarily represent the views of the Southern Soybean Disease Workers. Mention of trademark, or propriety products in this Proceedings does not constitute a guarantee, warranty, or endorsement of that produce by the Southern Soybean Disease Workers