Journal articles: 'Isolated groups'

1

Tovmassian, H. M., J. P. Torres-Papaqui, and H. Tiersch. "Isolated Shakhbazian compact groups." Astrophysics 53, no. 3 (July 2010): 320–28. http://dx.doi.org/10.1007/s10511-010-9123-z.

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2

Mohammadi, A., R. F. Nejad, and N. N. Mofrad. "Fusarium verticillioides from sugarcane, vegetative compatibility groups and pathogenicity." Plant Protection Science 48, No. 2 (May 3, 2012): 80–84. http://dx.doi.org/10.17221/49/2011-pps.

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Sugarcane plant samples affected by the disease pokkah boeng were collected from the major sugarcane producing areas in Iran. Fifty isolates of Fusarium verticillioides were recovered from diseased sugarcanes. Results of pathogenicity tests revealed that all isolates were pathogenic to sugarcane. Four hundred and eighty-five nitrate non-utilising mutants were generated from F. verticillioides isolates. Media used for nit mutant generation included potato dextrose agar, minimal medium and Czapeck agar amended with 1.8%, 2%, 2.5%, and 3% potassium chlorate. Nit mutants were divided into three phenotypic (nit1, nit3, and nitM) classes based on their growth on different nitrogen sources in the culture media. Among the isolates tested, 280, 115 and 90 nit1, nit3, and nit M were generated, respectively. Nit mutants were used to force the heterokaryon formation to determine the distribution of VCGs and their relation to pathogenicity and geographic origin. Forty-eight VCGs of F. verticillioides were isolated from sugarcane. Forty-six of the VCGs were represented by a single isolate, whereas the remaining two comprised two isolates. None of the VCGs was common.

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Waldecker, Rebecca. "Isolated involutions in finite groups." Memoirs of the American Mathematical Society 226, no. 1061 (August 13, 2013): 0. http://dx.doi.org/10.1090/s0065-9266-2013-00684-3.

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4

Meierfrankenfeld, Ulrich, Christopher Parker, and Peter Rowley. "Isolated subgroups in finite groups." Journal of the London Mathematical Society 79, no. 1 (October 6, 2008): 107–28. http://dx.doi.org/10.1112/jlms/jdn061.

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5

Sozutov, A. I., and E. B. Durakov. "On groups with isolated involution." Siberian Mathematical Journal 55, no. 4 (July 2014): 706–14. http://dx.doi.org/10.1134/s0037446614040120.

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6

Bonnafé, Cédric. "Quasi-Isolated Elements in Reductive Groups." Communications in Algebra 33, no. 7 (June 2005): 2315–37. http://dx.doi.org/10.1081/agb-200063602.

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7

Srinivasan, Bhama. "Isolated Blocks in Finite Classical Groups." Journal of Algebra 184, no. 3 (September 1996): 912–26. http://dx.doi.org/10.1006/jabr.1996.0291.

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8

Kuneva, I., and M. Kalinkov. "Isolated Galaxies, Pairs and Groups of Galaxies." International Astronomical Union Colloquium 124 (1990): 143–48. http://dx.doi.org/10.1017/s0252921100005005.

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We searched for isolated galaxies, pairs and groups of galaxies in the CfA survey (Huchra et al. 1983). It was assumed that the distances to galaxies are given by R = V/H0, where H0 = 100 km s−1 Mpc−1 and R> 6 Mpc.

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9

Kapovich, Michael, and János Kollár. "Fundamental groups of links of isolated singularities." Journal of the American Mathematical Society 27, no. 4 (May 22, 2014): 929–52. http://dx.doi.org/10.1090/s0894-0347-2014-00807-9.

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10

Sozutov, A. I., and B. E. Durakov. "On Groups with an Isolated 2-Subgroup." Mathematical Notes 105, no. 3-4 (March 2019): 425–28. http://dx.doi.org/10.1134/s000143461903012x.

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11

Buddrus, J., and J. Lambert. "Isolated paraffinic methyl groups in humic substances." Organic Geochemistry 23, no. 3 (March 1995): 269–71. http://dx.doi.org/10.1016/0146-6380(95)00027-c.

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12

Janko, Zvonimir. "Finite p-groups with some isolated subgroups." Journal of Algebra 465 (November 2016): 41–61. http://dx.doi.org/10.1016/j.jalgebra.2016.06.032.

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13

Srinivasan, Bhama. "Isolated blocks in finite classical groups, II." Journal of Algebra 319, no. 2 (January 2008): 824–32. http://dx.doi.org/10.1016/j.jalgebra.2006.05.040.

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14

Bootz, Vitor, Marina Trevisan, Trinh Thuan, Yuri Izotov, Angela Krabbe, and Oli Dors. "Isolated groups of extremely blue dwarf galaxies." Proceedings of the International Astronomical Union 15, S359 (March 2020): 168–69. http://dx.doi.org/10.1017/s1743921320001830.

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AbstractInteractions and mergers between dwarf galaxies are mostly gas-rich and should be marked by an intense star formation activity. But these processes, which are expected to be common at earlier times, are very difficult to observe at low redshifts. To investigate that, we look in the Sloan Digital Sky Survey (SDSS) for compact groups that contain one luminous compact galaxy (LCG) with very high specific star formation rate (sSFR) and at least two other blue galaxies. We found 24 groups that satisfy these criteria, among which 12 groups have SDSS spectroscopic data for at least 2 member galaxies. Here we want to investigate, using the tidal strength estimator Q, how interactions between neighbouring galaxies affect the sSFR and concentration of each LCG. Statistical tests reveal a correlation between Q and their sSFR, indicating that tidal forces between neighbouring galaxies might be inducing bursts of star formation in the LCGs.

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15

Lin, Wei-Hung, Yen-Zhen Zhang, Po-Yao Liu, Po-Shun Chen, Shining Wang, Pei-Yun Kuo, Tran Thi Dieu Thuy, et al. "Distinct Characteristics of Escherichia coli Isolated from Patients with Urinary Tract Infections in a Medical Center at a Ten-Year Interval." Pathogens 10, no. 9 (September 8, 2021): 1156. http://dx.doi.org/10.3390/pathogens10091156.

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Escherichia coli causing urinary tract infections (UTIs) are one of the most common outpatient bacterial infections. This study aimed to compare the characteristics of E. coli isolated from UTI patients in a single medical center in 2009–2010 (n = 504) and 2020 (n = 340). The antimicrobial susceptibility of E. coli was determined by the disk diffusion method. PCRs were conducted to detect phylogenetic groups, ST131, K1 capsule antigen, and 15 virulence factors. Phylogenetic group B2 dominated in our 2009–2010 and 2020 isolates. Moreover, no phylogenetic group E strains were isolated in 2020. E. coli isolates in 2020 were more susceptible to amoxicillin, ampicillin/sulbactam, cefuroxime, cefmetazole, ceftazidime, cefoxitin, tetracycline, and sulfamethoxazole/trimethoprim, compared to the isolates in 2009–2010. Extensively drug-resistant (XDR)-E. coli in 2009–2010 were detected in groups B1 (5 isolates), B2 (12 isolates), F (8 isolates), and unknown (1 isolate). In 2020, XDR-E. coli were only detected in groups A (2 isolates), B2 (5 isolates), D (1 isolate), and F (4 isolates). The prevalence of virulence factor genes aer and fimH were higher in E. coli in 2009–2010 compared to those in 2020. In contrast, afa and sat showed higher frequencies in E. coli isolates in 2020 compared to E. coli in 2009–2010.

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16

Hughes, M. S., E. M. Hoey, and P. V. Coyle. "A nucleotide sequence comparison of coxsackievirus B4 isolates from aquatic samples and clinical specimens." Epidemiology and Infection 110, no. 2 (April 1993): 389–98. http://dx.doi.org/10.1017/s0950268800068333.

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SUMMARYTen coxsackievirus B4 (CVB4) strains isolated from clinical and environmental sources in Northern Ireland in 1985–7, were compared at the nucleotide sequence level. Dideoxynucleotide sequencing of a polymerase chain reaction (PCR) amplified fragment, spanning the VP1/P2A genomic region, classified the isolates into two distinct groups or genotypes as defined by Rico-Hesse and colleagues for poliovirus type 1. Isolates within each group shared approximately 99% sequence identity at the nucleotide level whereas ≤86% sequence identity was shared between groups. One isolate derived from a clinical specimen in 1987 was grouped with six CVB4 isolates recovered from the aquatic environment in 1986–7. The second group comprised CVB4 isolates from clinical specimens in 1985–6. Both groups were different at the nucleotide level from the prototype strain isolated in 1950. It was concluded that the method could be used to sub-type CVB4 isolates and would be of value in epidemiological studies of CVB4. Predicted amino acid sequences revealed non-conservation of the tyrosine residue at the VP1/P2A cleavage site but were of little value in distinguishing CVB4 variants.

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17

Artemovich, O. D. "Isolated elements of prime order in finite groups." Ukrainian Mathematical Journal 40, no. 3 (1989): 343–45. http://dx.doi.org/10.1007/bf01061317.

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18

Ma, Xinghua, Michiaki Kudo, Ayako Takahashi, Koichi Tanimoto, and Yasuyoshi Ike. "Evidence of Nosocomial Infection in Japan Caused by High-Level Gentamicin-Resistant Enterococcus faecalis and Identification of the Pheromone-Responsive Conjugative Plasmid Encoding Gentamicin Resistance." Journal of Clinical Microbiology 36, no. 9 (1998): 2460–64. http://dx.doi.org/10.1128/jcm.36.9.2460-2464.1998.

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A total of 1,799 Enterococcus faecalis isolates were isolated from inpatients of Gunma University Hospital, Gunma, Japan, between 1992 and 1996. Four hundred thirty-two (22.3%) of the 1,799 isolates had high-level gentamicin resistance. Eighty-one of the 432 isolates were classified and were placed into four groups (group A through group D) with respect to the EcoRI restriction endonuclease profiles of the plasmid DNAs isolated from these strains. The 81 isolates were isolated from 36 patients. For 35 of the 36 patients, the same gentamicin-resistant isolates were isolated from the same or different specimens isolated from the same patient at different times during the hospitalization. For one other patient, two different groups of the isolates were isolated from the same specimen. Groups A, B, C, and D were isolated from 5, 14, 12, and 6 patients, respectively. The strains had multiple-drug resistance. The restriction endonuclease digestion patterns of the E. faecalis chromosomal DNAs isolated from isolates in the same group were also identical. The patients who had been infected with the gentamicin-resistant isolates from each group were geographically clustered on a ward(s). These results suggest that the isolates in each group were derived from a common source and had spread in the ward. The gentamicin-resistant isolates exhibited a clumping response upon exposure to pheromone (E. faecalis FA2-2 culture filtrate). The gentamicin resistance transferred at a high frequency to the recipient E. faecalis isolates by broth mating, and the pheromone-responsive plasmids encoding the gentamicin resistance were identified in these isolates.

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19

Krishnan, Ram, Jianwei Niu, Ravi Sandhu, and William H. Winsborough. "Group-Centric Secure Information-Sharing Models for Isolated Groups." ACM Transactions on Information and System Security 14, no. 3 (November 2011): 1–29. http://dx.doi.org/10.1145/2043621.2043623.

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20

Fintor, Lou. "Cancer Control Efforts Reach Out to “Culturally Isolated” Groups." JNCI: Journal of the National Cancer Institute 90, no. 19 (October 7, 1998): 1424–26. http://dx.doi.org/10.1093/jnci/90.19.1424.

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21

Pinna, Francesco, and Roberto Murrau. "Isolated and Single Pedestrians and Pedestrian Groups on Sidewalks." Infrastructures 2, no. 4 (November 21, 2017): 21. http://dx.doi.org/10.3390/infrastructures2040021.

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22

Caprace, Pierre-Emmanuel. "Buildings with isolated subspaces and relatively hyperbolic Coxeter groups." Innovations in Incidence Geometry: Algebraic, Topological and Combinatorial 10, no. 1 (2009): 15–31. http://dx.doi.org/10.2140/iig.2009.10.15.

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23

Rhoades, K. R., and R. B. Rimler. "Capsular Groups of Pasteurella multocida Isolated from Avian Hosts." Avian Diseases 31, no. 4 (October 1987): 895. http://dx.doi.org/10.2307/1591048.

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24

Shiga, T., S. Kuwahara, N. Takeo, and S. Mikoshiba. "18.1: Adaptive Dimming Technique with Optically Isolated Lamp Groups." SID Symposium Digest of Technical Papers 36, no. 1 (2005): 992. http://dx.doi.org/10.1889/1.2036617.

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25

Meierfrankenfeld, Ulrich, Christopher Parker, and Peter Rowley. "Rank one isolated p-minimal subgroups in finite groups." Journal of Algebra 566 (January 2021): 1–93. http://dx.doi.org/10.1016/j.jalgebra.2020.08.017.

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26

Sementovskii, A. V. "Irreducible characters and normal structure of finite-isolated groups." Mathematical Notes 51, no. 3 (March 1992): 296–300. http://dx.doi.org/10.1007/bf01206396.

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27

de Cornulier, Yves, Luc Guyot, and Wolfgang Pitsch. "On the isolated points in the space of groups." Journal of Algebra 307, no. 1 (January 2007): 254–77. http://dx.doi.org/10.1016/j.jalgebra.2006.02.012.

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28

Hruska, G. Christopher, and Kim Ruane. "Connectedness properties and splittings of groups with isolated flats." Algebraic & Geometric Topology 21, no. 2 (April 25, 2021): 755–800. http://dx.doi.org/10.2140/agt.2021.21.755.

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29

DesROSIERS, ANNIE, JOHN M. FAIRBROTHER, ROGER P. JOHNSON, CLARISSE DESAUTELS, ANN LETELLIER, and SYLVAIN QUESSY. "Phenotypic and Genotypic Characterization of Escherichia coli Verotoxin-Producing Isolates from Humans and Pigs." Journal of Food Protection 64, no. 12 (December 1, 2001): 1904–11. http://dx.doi.org/10.4315/0362-028x-64.12.1904.

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The aim of this study was to characterize verotoxin-producing Escherichia coli (VTEC) isolates obtained from humans and pigs in the same geographic areas and during the same period of time in order to determine whether porcine VTEC isolates could be related to human cases of diarrhea and also to detect the presence of virulence factors in these isolates. From 1,352 human and 620 porcine fecal samples, 11 human and 18 porcine verotoxin-positive isolates were obtained by the VT immunoblot or the individual colony testing technique. In addition, 52 porcine VTEC strains isolated from diseased pigs at the Faculté de médecine vétérinaire during the same period or from fecal samples collected previously isolated at slaughterhouses were characterized in this study. Antimicrobial resistance profiles were different between human and porcine isolates. In general, the serotypes observed in the two groups were different. No porcine isolate was of serotype O157:H7; however, one isolate was O91:NM, a serotype that has been associated with hemorrhagic colitis in humans. Also, one serotype (O8:H19) was found in isolates from both species; however, the O8:H19 isolates of the two groups were of different pathotypes. The pathotypes observed in the human and porcine isolates were different, with the exception of VT2vx-positive isolates; the serotypes of these isolates from the two groups were nevertheless different. Pulsed-field gel electrophoresis analysis indicated no relatedness between the human and porcine isolates. In conclusion, these results suggest that the porcine and human isolates of the present study were not genetically related. Most porcine VTEC isolates did not possess known virulence factors required to infect humans. However, certain non-O157:H7 porcine VTECs may potentially infect humans.

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Thapa, D. B., and A. Chapagain. "Antibiogram of Escherichia coli Isolated from Avian Colibacillosis in Chitwan District of Nepal." International Journal of Applied Sciences and Biotechnology 8, no. 1 (March 29, 2020): 52–60. http://dx.doi.org/10.3126/ijasbt.v8i1.28254.

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A cross-sectional study was conducted at National Avian Disease Investigation Laboratory, Chitwan to determine antibiogram of Escherichia coli isolated from avian colibacillosis cases of broilers and layers in Chitwan. One hundred and sixty (95 from broilers and 65 from layers) liver samples were collected aseptically during postmortem. Samples were taken purposively from dead birds showing lesions perihepatitis, pericarditis, air-saculitis, omphalitis and egg peritonitis. Isolation and identification were made by examination of cultural characteristics of E. coli in MacConkey’s agar, Eosin methylene blue (EMB) agar, Gram’s staining and biochemical tests. Antibiogram of identified E. coli isolate was evaluated against six antibiotics of six different groups by disk diffusion method following CLSI guidelines. One hundred and three E. coliisolates (73 from broilers and 30 from layers) were isolated from one hundred and sixty samples. Highest resistance was observed against Ampicillin (100%) followed by Co-trimoxazole (86.40%), Doxycycline (46.60%), Levofloxacin (45.63%), Nitrofurantoin (26.21%) and Amikacin (10.68%). Nearly about all (96.12%) isolates from 103 isolated E. coli isolates showed multidrugs resistance to two or more than two antimicrobials. All multidrug resistance isolates showed 16 different patterns with each isolate being resistance to at least two drugs. The multiple antibiotic resistance indexing ranged from 0.2 to 0.8 and proportion of isolates with MAR index greater than 0.2 was 96.12%. Int. J. Appl. Sci. Biotechnol. Vol 8(1): 52-60

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31

Davis, Kathryn E. R., Shayne J. Joseph, and Peter H. Janssen. "Effects of Growth Medium, Inoculum Size, and Incubation Time on Culturability and Isolation of Soil Bacteria." Applied and Environmental Microbiology 71, no. 2 (February 2005): 826–34. http://dx.doi.org/10.1128/aem.71.2.826-834.2005.

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ABSTRACT Soils are inhabited by many bacteria from phylogenetic groups that are poorly studied because representatives are rarely isolated in cultivation studies. Part of the reason for the failure to cultivate these bacteria is the low frequency with which bacterial cells in soil form visible colonies when inoculated onto standard microbiological media, resulting in low viable counts. We investigated the effects of three factors on viable counts, assessed as numbers of CFU on solid media, and on the phylogenetic groups to which the isolated colony-forming bacteria belong. These factors were inoculum size, growth medium, and incubation time. Decreasing the inoculum size resulted in significant increases in the viable count but did not appear to affect colony formation by members of rarely isolated groups. Some media that are traditionally used for soil microbiological studies returned low viable counts and did not result in the isolation of members of rarely isolated groups. Newly developed media, in contrast, resulted in high viable counts and in the isolation of many members of rarely isolated groups, regardless of the inoculum size. Increased incubation times of up to 3 months allowed the development of visible colonies of members of rarely isolated groups in conjunction with the use of appropriate media. Once isolated, pure cultures of members of rarely isolated groups took longer to form visible colonies than did members of commonly isolated groups. Using these new media and extended incubation times, we were able to isolate many members of the phyla Acidobacteria (subdivisions 1, 2, 3, and 4), Gemmatimonadetes, Chloroflexi, and Planctomycetes (including representatives of the previously uncultured WPS-1 lineage) as well as members of the subclasses Rubrobacteridae and Acidimicrobidae of the phylum Actinobacteria.

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32

Hisanaga, Tamiko, Catherine Soos, Nicola Lewis, Oliver Lung, Matthew Suderman, and Yohannes Berhane. "Genetic and Antigenic Characterization of Avian Avulavirus Type 6 (AAvV-6) Circulating in Canadian Wild Birds (2005–2017)." Viruses 13, no. 4 (March 24, 2021): 543. http://dx.doi.org/10.3390/v13040543.

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We describe for the first time the genetic and antigenic characterization of 18 avian avulavirus type-6 viruses (AAvV-6) that were isolated from wild waterfowl in the Americas over the span of 12 years. Only one of the AAvV-6 viruses isolated failed to hemagglutinate chicken red blood cells. We were able to obtain full genome sequences of 16 and 2 fusion gene sequences from the remaining 2 isolates. This is more than double the number of full genome sequences available at the NCBI database. These AAvV-6 viruses phylogenetically grouped into the 2 existing AAvV-6 genotype subgroups indicating the existence of an intercontinental epidemiological link with other AAvV-6 viruses isolated from migratory waterfowl from different Eurasian countries. Antigenic maps made using HI assay data for these isolates showed that the two genetic groups were also antigenically distinct. An isolate representing each genotype was inoculated in specific pathogen free (SPF) chickens, however, no clinical symptoms were observed. A duplex fusion gene based real-time assay for the detection and genotyping of AAvV-6 to genotype 1 and 2 was developed. Using the developed assay, the viral shedding pattern in the infected chickens was examined. The chickens infected with both genotypes were able to shed the virus orally for about a week, however, no significant cloacal shedding was detected in chickens of both groups. Chickens in both groups developed detectable levels of anti-hemagglutinin antibodies 7 days after infection.

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33

Bazarova, Natalya N., Joseph B. Walther, and Poppy L. McLeod. "Minority Influence in Virtual Groups." Communication Research 39, no. 3 (February 21, 2011): 295–316. http://dx.doi.org/10.1177/0093650211399752.

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This study examined minority influence within virtual groups and how members’ geographic dispersion and argument consistency affect group decisions. Competing predictions were derived from several theories that were applicable but untested in the domain of online interaction: a double minority effect, the black sheep effect, congruity theory applied to groups, and the minority leniency contract framework. Online groups were created that had 4 collocated members or 4 geographically distributed members, or 2 collocated and 2 isolated members. Group members were provided biased distributions of information resembling a hidden profile to facilitate majority and minority positions resulting in 24 groups with a minority opinion holder geographically isolated or in proximity with one or more other members. The patterns of minority members’ influence on majority members’ decisions lent greatest support to the black sheep effect, congruity, and minority leniency approaches, depending on the respective location of the minority opinion holders and the consistency with which they argued their positions.

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34

Zavel'sky, V. O., N. I. Bezmen, and V. A. Zharikov. "Water in albite glasses: OH-groups, isolated molecules, and clusters." Journal of Non-Crystalline Solids 224, no. 3 (April 1998): 225–31. http://dx.doi.org/10.1016/s0022-3093(97)00477-8.

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35

Haiber, S., and J. Buddrus. "Isolated methyl groups as new structural parameters for petroleum crudes." Fuel 81, no. 8 (May 2002): 981–87. http://dx.doi.org/10.1016/s0016-2361(02)00007-8.

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36

Dagg, Alexander P., Zhiyuan Huang, Monica A. Marks, Dapeng Zhou, Megha Chawla, and Ming L. Tang. "Synthetic Control of Isolated, Single Functional Groups on Silica Surfaces." Langmuir 30, no. 24 (June 10, 2014): 7098–103. http://dx.doi.org/10.1021/la501231v.

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37

Persoon, Gerard. "Isolated groups or indigenous peoples; Indonesia and the international discourse." Bijdragen tot de taal-, land- en volkenkunde / Journal of the Humanities and Social Sciences of Southeast Asia 154, no. 2 (1998): 281–304. http://dx.doi.org/10.1163/22134379-90003899.

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38

Cairney, Sheree, and Kylie Dingwall. "The mysterious practice of petrol sniffing in isolated Indigenous groups." Journal of Paediatrics and Child Health 46, no. 9 (September 20, 2010): 510–15. http://dx.doi.org/10.1111/j.1440-1754.2010.01850.x.

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39

Sozutov, A. I., and N. M. Suchkov. "On infinite groups with a given strongly isolated 2-subgroup." Mathematical Notes 68, no. 2 (August 2000): 237–47. http://dx.doi.org/10.1007/bf02675349.

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40

Gracia, L., P. González-Navarrete, M. Calatayud, and J. Andrés. "A DFT study of methanol dissociation on isolated vanadate groups." Catalysis Today 139, no. 3 (December 2008): 214–20. http://dx.doi.org/10.1016/j.cattod.2008.05.033.

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41

Ebeling, Wolfgang. "Vanishing lattices and monodromy groups of isolated complete intersection singularities." Inventiones Mathematicae 90, no. 3 (October 1987): 653–68. http://dx.doi.org/10.1007/bf01389184.

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42

Yeşilbağ, K., and I. Burgu. "Epitopic characterisation of Turkish bovine viral diarrhoea virus (bvdv) isolates using monoclonal antibodies." Acta Veterinaria Hungarica 51, no. 2 (March 1, 2003): 237–44. http://dx.doi.org/10.1556/avet.51.2003.2.12.

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In this study, 15 bovine viral diarrhoea viruses (BVDV) isolated from the field in Turkey were characterised for their biotype, cloned and eventually analysed for their epitopic composition in terms of glycoprotein E2. Immunoplaque assay, plaque assay, limiting dilution and streptavidin-biotin-peroxidase techniques were used for biotype characterisation, cloning of cytopathic (cp) and noncytopathic (ncp) biotypes and epitope analysis, respectively. While 14 out of 15 BVDV isolates were distinguished as ncp biotype, 1 isolate was found to be containing both biotypes (cp + ncp). According to the reactivity patterns of isolates with 15 monoclonal antibodies, 4 different antigenic groups could be formed. There were no antigenic differences between the isolates derived from the same animal with various time intervals. On the other hand, biotype clones isolated from the same animal exhibited difference in one epitope. This is the first study describing antigenic characterisation of BVDV field isolates in Turkey.

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43

Délye, C., F. Laigret, and M. F. Corio-Costet. "RAPD Analysis Provides Insight into the Biology and Epidemiology of Uncinula necator." Phytopathology® 87, no. 7 (July 1997): 670–77. http://dx.doi.org/10.1094/phyto.1997.87.7.670.

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Ninety isolates of grape powdery mildew (Uncinula necator) from Europe (sixty-two) and India (twenty-eight) were collected. Ten of the sixty-two European isolates originated from mycelium overwintering in dormant buds (“flagshoots”). Mating types were determined, and genetic variation was assessed by random amplified polymorphic DNA (RAPD). Forty-one European isolates, including all “flagshoot” isolates, were mating type +, and twenty-one were mating type -. All Indian isolates were mating type -. Phenetic analysis based on 414 amplicons revealed three main groups. Most European isolates (53) clustered together. Nine flagshoot isolates clustered in a second distinct group. These isolates, which coexisted with other isolates in the field, may represent a genetically isolated biotype of U. necator. Indian isolates clustered into two groups. The first group (15 isolates) was a subgroup of the group containing European nonflagshoot isolates. The second group (12 isolates) was distinct from the other groups. These two groups of Indian isolates may represent genetically isolated populations with different climatic tolerances. A polymerase chain reaction primer pair, derived from a RAPD fragment specific to the Indian isolates, proved to be suitable for field studies.

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44

Jasem, Milan. "On weak isometries in directed groups." Mathematica Slovaca 69, no. 5 (October 25, 2019): 989–98. http://dx.doi.org/10.1515/ms-2017-0283.

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Abstract In the paper weak isometries in directed groups are investigated. It is proved that for every weak isometry f in a directed group G the relation f(UL(x, y) ∩ LU(x, y)) = UL(f(x), f(y)) ∩ LU(f(x), f(y)) is valid for each x, y ∈ G. The notions of an orthogonality of two elements and of a subgroup symmetry in directed groups are introduced and it is shown that each weak isometry in a 2-isolated directed group or in an abelian directed group is a composition of a subgroup symmetry and a right translation. It is also proved that stable weak isometries in a 2-isolated abelian directed group G are directly related to subdirect decompositions of the subgroup G2 = {2x; x ∈ G} of G.

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Barchiesi, F., L. K. Najvar, M. F. Luther, G. Scalise, M. G. Rinaldi, and J. R. Graybill. "Variation in fluconazole efficacy for Candida albicans strains sequentially isolated from oral cavities of patients with AIDS in an experimental murine candidiasis model." Antimicrobial Agents and Chemotherapy 40, no. 5 (May 1996): 1317–20. http://dx.doi.org/10.1128/aac.40.5.1317.

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Four strains of Candida albicans, isolated from two patients with AIDS who had undergone prolonged fluconazole therapy for oral candidiasis, were studied in a model of disseminated murine candidiasis. Pre- and posttreatment isolates from each patient were genetically related, and the fluconazole MICs for the strains had increased significantly, from 0.25 to 32 micrograms/ml for the strains isolated from patient 1 and from 1.0 to 16 micrograms/ml for the strains isolated from patient 2. Mice were infected intravenously and were treated orally with fluconazole. For survival studies, mice were treated from day 1 to day 10 postinfection and were observed through day 30. The fluconazole dosages were as follows: 0.25, 0.5, 1.0, and 5.0 mg/kg of body weight twice a day. For tissue burden studies, two groups of mice (each group received fluconazole at 0.25 or 5.0 mg/kg) were treated from day 1 to day 7 and were sacrificed 1 day later for quantitative tissue cultures of the spleen and both kidneys. For pretreatment isolates from both patients, all fluconazole dosing regimens were effective at prolonging survival compared with the survival of the control groups. For posttreatment isolates, only fluconazole at 5.0 mg/kg was effective at prolonging survival. Both fluconazole dosing regimens used in the tissue burden studies significantly reduced the counts of the pretreatment isolate from patient 1 in the spleen and kidney, while fluconazole at 5.0 mg/kg was effective at reducing the counts of the posttreatment isolate. For both isolates from patient 2, only fluconazole at 5.0 mg/kg was effective at reducing the counts in the spleen and kidney. The study indicates that C. albicans mutation to resistance to fluconazole may play a critical role in fluconazole-refractory oral candidiasis in AIDS patients.

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Sidhu, Gurmel S. "Characteristics and natural occurrence of Gibberella fujikuroi mating groups A and D on sorghum and corn hosts." Canadian Journal of Botany 63, no. 3 (March 1, 1985): 562–66. http://dx.doi.org/10.1139/b85-071.

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Characteristics and natural occurrence of mating groups A and D of Gibberella fujikuroi were studied and compared with one another in live and dead sorghum plants. Mating group A isolates belong to G. fujikuroi var. moniliformis and D to G. fujikuroi var. intermedia. The fungal groups were isolated from 40-, 60-, 80-, and >80-day-old plants, and also from anthers, seeds, and dead and laboratory dried stalks. Isolates in group D differed from those in group A in colony morphology, mating type behavior, sexuality, crossability, and in tissue preference. Group D was more abundant in senescent and dead plants, as well as in laboratory dried plants and anthers. Group A was prevalent in live and nonsenescent plants and seed. Both groups were found occurring together in nature on corn and sorghum plants and seemed to be sympatric but reproductively isolated.

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Ahn, Pyung, Hoo-Sup Chung, and Yong-Hwan Lee. "Vegetative Compatibility Groups and Pathogenicity Among Isolates of Fusarium oxysporum f. sp. cucumerinum." Plant Disease 82, no. 2 (February 1998): 244–46. http://dx.doi.org/10.1094/pdis.1998.82.2.244.

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Seventy-eight isolates of Fusarium oxysporum f. sp. cucumerinum, the causal agent of cucumber wilt, were isolated from symptomatic tissues of cucumber from four provinces in Korea. These isolates were grouped into vegetative compatibility groups (VCGs) by demonstrating heterokaryosis by complementation tests using nitrate nonutilizing (nit) mutants. All isolates were grouped into six VCGs—1-A, 1-B, 1-C, 1-D, 1-E, and 1-F. No self-incompatibility was observed in any of the isolates tested. VCG 1-A was the most common group within growing regions in Korea and proved to be the most virulent of the VCGs identified. These data indicate that the level of virulence in F. oxysporum f. sp. cucumerinum is related to VCG.

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Bardakov, Valerij G. "On p-Separability of Subgroups of Free Metabelian Groups." Algebra Colloquium 13, no. 02 (June 2006): 289–94. http://dx.doi.org/10.1142/s1005386706000253.

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We prove that every free metabelian non-cyclic group has a finitely generated isolated subgroup which is not separable in the class of nilpotent groups. As a corollary, we prove that for every prime number p, an arbitrary free metabelian non-cyclic group has a finitely generated p′-isolated subgroup which is not p-separable.

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Ivanchenko, D. A. "In vitro ACTIVITY OF PRODIGIOSIN ISOLATED FROM Serratia marcescens IN COMBINATION WITH TWO GROUPS OF ANTIBIOTICS AGAINST GRAM-POSITIVE MICROORGANISMS." Biotechnologia Acta 13, no. 1 (February 2020): 38–44. http://dx.doi.org/10.15407/biotech13.01.038.

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Biedukiewicz, Anna. "Yeast-like fungi isolated in students." Acta Mycologica 42, no. 1 (December 23, 2013): 141–49. http://dx.doi.org/10.5586/am.2007.015.

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The occurrence of yeast-like fungi in the most important infection portals of the respiratory system in 200 randomly chosen students of biology and veterinary medicine was examined. The students come into direct contact with plants and animals that may be colonised by fungi belonging to various systematic groups. Nine species of yeast-like fungi, including 7 species determined in the biologists, were recorded in the subjects. <em>Candida tropicalis</em> and <em>Candida albicans</em> were the most frequently isolated fungi. The greatest number of fungi was isolated from the oral cavity (124 isolates), fewer from the throat (79 isolates), and the smallest number from the nose (8 isolates). Fungi occurred more frequently in autumn and slightly less frequently in spring, and were isolated more frequently from women than from men.

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Journal articles on the topic 'Isolated groups'

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