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  1. Book ; Thesis: Studies on the response of some Petunia genotypes to androgenesis

    Chaar, Mahmoud

    (Schriften zu internationalen Agrarentwicklung ; Bd. 80)

    2018  

    Author's details Mahmoud Chaar
    Series title Schriften zu internationalen Agrarentwicklung ; Bd. 80
    Schriften zur internationalen Agrarentwicklung
    Collection Schriften zur internationalen Agrarentwicklung
    Keywords Androgenese ; Biotechnologie ; Gartenbau ; Petunien ; Petunie ; Blumenzüchtung ; Antherenkultur
    Subject Staubbeutel ; Blume ; Petunia
    Subject code 630
    Language English
    Size XII, 226 Seiten, Illustrationen, Diagramme
    Edition 1. Auflage
    Publisher Verlag Dr. Köster
    Publishing place Berlin
    Publishing country Germany
    Document type Book ; Thesis
    Thesis / German Habilitation thesis Dissertation, Humboldt-Universität zu Berlin, 2018
    Note Enthält eine Zusammenfassung in deutscher Sprache
    HBZ-ID HT019678436
    ISBN 978-3-89574-904-9 ; 3-89574-904-4
    Database Catalogue ZB MED Nutrition, Environment, Agriculture

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    188/196 available for loan (reading room) Freihandmagazin (U1)

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  2. Book: Studies on the response of some Petunia genotypes to androgenesis

    Chaar, Mahmoud

    (Schriften zur Internationalen Agrarentwicklung ; 80)

    2018  

    Abstract: Biotechnological techniques are nowadays in use of the breeders to improve and quicken the production of new plant cultivars with desired characteristics. Among these techniques, anther and isolated microspore culture were used successfully in breeding ... ...

    Series title Schriften zur Internationalen Agrarentwicklung ; 80
    Abstract Biotechnological techniques are nowadays in use of the breeders to improve and quicken the production of new plant cultivars with desired characteristics. Among these techniques, anther and isolated microspore culture were used successfully in breeding programs in many plant species (e.g. wheat, barley, and tobacco). Anther culture is usually used for haploid production, but it may also have potential for developing plants with various ploidy levels which can be used in plant breeding program...
    Keywords Biotechnologie ; Androgenese ; Gartenbau ; Petunien
    Language English
    Size 226 p.
    Publisher Verlag Dr. Köster
    Document type Book
    Note Ernährungs-, Umwelt- und Agrarwissenschaften 250418
    Format 148 x 210
    ISBN 9783895749049 ; 3895749044
    Database PDA

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  3. Book ; Thesis: Fracture load of three-unit zirconia fixed dental prostheses veneered with different materials and techniques

    Chaar, M. Sad

    an in vitro study

    2012  

    Author's details vorgelegt von M. Sad Chaar
    Language English
    Size 81 Bl. : Ill., graph. Darst.
    Publishing country Germany
    Document type Book ; Thesis
    Thesis / German Habilitation thesis Freiburg (Breisgau), Univ., Diss., 2012
    HBZ-ID HT017721693
    Database Catalogue ZB MED Medicine, Health

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    2013 E 700 order for loan Magazin

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  4. Article ; Online: Effects of sterilization, conditioning, and thermal aging on the retention of zirconia hybrid abutments: A laboratory study.

    Alghanaim, Nalah / Kern, Matthias / Yazigi, Christine / Chaar, M Sad

    Clinical implant dentistry and related research

    2024  

    Abstract: Objective: To investigate the effects of sterilization, conditioning method, and thermal aging on the retentive strength of two-piece zirconia abutments.: Materials and methods: In total, 128 stock zirconia abutments were divided into four groups (n = ...

    Abstract Objective: To investigate the effects of sterilization, conditioning method, and thermal aging on the retentive strength of two-piece zirconia abutments.
    Materials and methods: In total, 128 stock zirconia abutments were divided into four groups (n = 32) according to the conditioning parameters: (A) air-abrasion using 50 μm alumina particles/1.0 bar, (B) 50 μm/2.0 bar, (C) 100 μm/1.0 bar, and (D) 100 μm/2.0 bar. All abutments were bonded onto titanium bases using DTK adhesive resin and stored in water bath (37°C) for 72 h. Each group was subdivided into two subgroups (n = 16), group 1 was disinfected, whereas group 2 followed disinfection and autoclave sterilization. Half of the specimens of each subgroup (n = 8) was directly subjected to the axial retention test (groups N), while the other half was first subjected to 150 days of thermocycling followed by retention test (groups T). Statistical analysis was performed with three-way ANOVA, additional statistical analysis was performed by using separate one-way ANOVAs followed by the Tukey's post-hoc test for post hoc pairwise comparisons among groups.
    Results: The highest median retention strength was recorded for group B2N (1390 N), whereas the lowest strength was recorded for group C1T (688 N). No significant interaction (p ≥ 0.05) was detected between the different variables; conditioning method, sterilization, and the thermal cycling regarding the effect on the resulting retention. However, the sterilization always showed a positive effect. Thermocycling presented an adversely significant effect only in the absence of sterilization (p < 0.05), with the exception of subgroups A. For the sterilized groups, thermocycling had no statistically significant effect on the retention.
    Conclusion: Steam autoclaving increased the retention of hybrid zirconia abutments. DTK adhesive resin for two-piece zirconia abutments performed well after sterilization and thermocycling.
    Language English
    Publishing date 2024-04-29
    Publishing country United States
    Document type Journal Article
    ZDB-ID 2094300-3
    ISSN 1708-8208 ; 1523-0899
    ISSN (online) 1708-8208
    ISSN 1523-0899
    DOI 10.1111/cid.13332
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Cologne/Königswinter

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  5. Article ; Online: How can we shape our future as bariatric surgeons and win the fight against obesity in an ever-changing healthcare industry?

    El Chaar, Maher

    Surgery for obesity and related diseases : official journal of the American Society for Bariatric Surgery

    2020  Volume 17, Issue 2, Page(s) 466–468

    MeSH term(s) Bariatric Surgery ; Bariatrics ; Health Care Sector ; Humans ; Obesity/prevention & control ; Obesity/surgery ; Obesity, Morbid/surgery ; Surgeons
    Language English
    Publishing date 2020-11-17
    Publishing country United States
    Document type Letter
    ZDB-ID 2274243-8
    ISSN 1878-7533 ; 1550-7289
    ISSN (online) 1878-7533
    ISSN 1550-7289
    DOI 10.1016/j.soard.2020.11.012
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article ; Online: Resin-bonded attachments made of monolithic zirconia ceramic: a minimally invasive and esthetic treatment approach.

    Becker, Merlind / Chaar, M Sad / Kern, Matthias

    Quintessence international (Berlin, Germany : 1985)

    2023  Volume 54, Issue 3, Page(s) 220–226

    Abstract: Objective: The aim of this case report was to present a minimally invasive and esthetic treatment approach for the replacement of missing teeth removable partial dentures retained by zirconia ceramic resin-bonded attachments.: Method and materials: ... ...

    Abstract Objective: The aim of this case report was to present a minimally invasive and esthetic treatment approach for the replacement of missing teeth removable partial dentures retained by zirconia ceramic resin-bonded attachments.
    Method and materials: The resin-bonded attachments were digitally designed and milled using CAD/CAM technology from monolithic 3Y-TZP zirconia ceramic. The resin-bonded attachments had an optimized attachment design approved for zirconia ceramic. The preparation was based on general preparation guidelines for resin-bonded attachments and resin-bonded fixed dental prostheses (RBFDPs). After placement of rubber dam, the resin-bonded attachments were bonded with a phosphate monomer-containing luting resin.
    Results: The presented resin-bonded attachment-retained removable partial denture was successful over 30 months of clinical observation without any complications. The patient was satisfied with the minimally invasive treatment procedure.
    Conclusion: Zirconia ceramic resin-bonded attachments fabricated with a special attachment design are an esthetic and minimally invasive treatment approach. However, clinical data on the long-term outcome of zirconia resin-bonded attachments are still needed. (Quintessence Int 2023;54:220-226; doi: 10.3290/j.qi.b3819523).
    MeSH term(s) Humans ; Denture, Partial, Fixed, Resin-Bonded ; Esthetics, Dental ; Ceramics ; Zirconium ; Dental Bonding/methods
    Chemical Substances zirconium oxide (S38N85C5G0) ; Zirconium (C6V6S92N3C)
    Language English
    Publishing date 2023-01-18
    Publishing country Germany
    Document type Case Reports ; Journal Article
    ZDB-ID 7436-6
    ISSN 1936-7163 ; 0033-6572
    ISSN (online) 1936-7163
    ISSN 0033-6572
    DOI 10.3290/j.qi.b3819523
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article ; Online: Comparison of bond strength to three restorative materials after contamination and the use of two cleaning agents.

    Yazigi, Christine / Kern, Matthias / Chaar, M Sad

    The Journal of prosthetic dentistry

    2023  

    Abstract: Statement of problem: Scientific data on the decontamination effectiveness of a newly introduced cleaning agent are lacking.: Purpose: The purpose of this in vitro study was to evaluate and compare the tensile bond strength (TBS) of 3 different ... ...

    Abstract Statement of problem: Scientific data on the decontamination effectiveness of a newly introduced cleaning agent are lacking.
    Purpose: The purpose of this in vitro study was to evaluate and compare the tensile bond strength (TBS) of 3 different restorative bonding surfaces after contamination with saliva following different cleaning protocols.
    Material and methods: A total of 192 disk specimens were made out of 3 materials (n=64); Katana Avencia (A), Katana Zirconia (Z), and e.max CAD (L). The bonding surfaces of all disks were polished, steam cleaned, and then pretreated by following the recommended protocol for each material. The specimens of each group were divided into 4 subgroups (n=16). The first subgroup served as the reference (R), where no contamination was applied. The 3 other subgroups were contaminated with saliva and subsequently rinsed with water for 20 seconds and dried with oil- and water-free air spray. They were then either not treated with any cleaning method (0), cleaned with Katana Cleaner (K), or cleaned with Ivoclean (I). The bonding surfaces of the specimens were perpendicularly luted to plexiglass tubes filled with dual-polymerizing composite resin (Clearfil DC Core) with resin cement (Panavia V5) after the recommended surface conditioning. Each subgroup was further subdivided into 2 groups: stored in 37 °C water for 3 days or subjected to thermal-cyclic loading for 150 days with 37 500 thermal cycles (7500 per month), temperature 5 to 55 °C, and dwell time of 30 seconds. All specimens were subjected to TBS testing in a universal testing machine. Three-way ANOVA was applied. A significant interaction (P<.01) was detected between the 3 different variables (material, treatment, aging). After significant interactions had been revealed by 3-way ANOVA, additional statistical analysis was performed by using separate 2-way ANOVAs, then separate 1-way ANOVAs followed by the Tukey-HSD test for post hoc pairwise comparisons among groups (α=.05 for all tests). All specimens underwent failure mode analysis after TBS testing RESULTS: All specimens survived the storage with thermocycling except for group Z-0, where all specimens debonded during thermocycling. The mean ±standard deviation TBS values ranged from 18.3 ±5.3 MPa to 34.0 ±5.4 MPa after 3 days and from 6.7 ±5.5 MPa to 26.9 ±5.4 MPa after 150 days.
    Conclusions: Contaminated groups that did not receive any cleaning had significantly lower TBS. Thermocycling had a negative effect on the TBS but was not statistically significant for all groups. Using the same cleaning method, the restorative material did had a significant effect on the TBS after 150 days.
    Language English
    Publishing date 2023-07-10
    Publishing country United States
    Document type Journal Article
    ZDB-ID 218157-5
    ISSN 1097-6841 ; 0022-3913
    ISSN (online) 1097-6841
    ISSN 0022-3913
    DOI 10.1016/j.prosdent.2023.06.002
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  8. Article ; Online: Comment on: Effect of the closure of mesenteric defects in laparoscopic Roux-En-Y gastric bypass: a prospective study.

    El Chaar, Maher

    Surgery for obesity and related diseases : official journal of the American Society for Bariatric Surgery

    2019  Volume 15, Issue 11, Page(s) 1909–1911

    MeSH term(s) Gastric Bypass ; Laparoscopy ; Mesentery/surgery ; Prospective Studies
    Language English
    Publishing date 2019-08-21
    Publishing country United States
    Document type Editorial ; Comment
    ZDB-ID 2274243-8
    ISSN 1878-7533 ; 1550-7289
    ISSN (online) 1878-7533
    ISSN 1550-7289
    DOI 10.1016/j.soard.2019.08.009
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  9. Article ; Online: Phenotypic and molecular characterization of multi-drug resistant Klebsiella spp. isolates recovered from clinical settings.

    Diab, Hassan / Rahy, Kelven / Jisr, Tamima / El Chaar, Mira / Abboud, Edmond / Tokajian, Sima

    Infection, genetics and evolution : journal of molecular epidemiology and evolutionary genetics in infectious diseases

    2024  Volume 119, Page(s) 105583

    Abstract: Klebsiella pneumoniae is a Gram-negative bacterium that colonizes the gastrointestinal tract and nasopharynx with many being linked to nosocomial infections. Extended-spectrum β-lactamases (ESBL)-producing and carbapenem-resistant K. pneumoniae is ... ...

    Abstract Klebsiella pneumoniae is a Gram-negative bacterium that colonizes the gastrointestinal tract and nasopharynx with many being linked to nosocomial infections. Extended-spectrum β-lactamases (ESBL)-producing and carbapenem-resistant K. pneumoniae is recognized by the World Health Organization (WHO) as a critical public health concern. In this study, whole-genome sequencing (WGS) - based analysis was performed to understand the molecular epidemiology of multi-drug resistant Klebsiella spp. clinical isolates. Genome comparison, multi-locus sequence typing (MLST), pulsed-field gel electrophoresis (PFGE), and whole-genome-SNP-based phylogenetic analysis (wg-SNP) were used for in-depth molecular characterization. in silico typing was used to determine the resistance genes, virulence factors, Inc. groups, and capsular types. All except one isolate were non-susceptible to meropenem and 89% were non-susceptible to ertapenem and imipenem. bla
    MeSH term(s) Humans ; Klebsiella/genetics ; Anti-Bacterial Agents/pharmacology ; Anti-Bacterial Agents/therapeutic use ; Multilocus Sequence Typing ; Phylogeny ; Microbial Sensitivity Tests ; beta-Lactamases/genetics ; Bacterial Proteins/genetics ; Klebsiella pneumoniae ; Klebsiella Infections/microbiology
    Chemical Substances Anti-Bacterial Agents ; beta-Lactamases (EC 3.5.2.6) ; Bacterial Proteins
    Language English
    Publishing date 2024-03-12
    Publishing country Netherlands
    Document type Journal Article
    ZDB-ID 2037068-4
    ISSN 1567-7257 ; 1567-1348
    ISSN (online) 1567-7257
    ISSN 1567-1348
    DOI 10.1016/j.meegid.2024.105583
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  10. Article: Characterization of

    Moussa, Jennifer / Nassour, Elie / Jisr, Tamima / El Chaar, Mira / Tokajian, Sima

    Heliyon

    2024  Volume 10, Issue 8, Page(s) e29642

    Abstract: The increase in the prevalence of carbapenem-producing Enterobacterales (CPE) is a major threat, with the New Delhi metallo-β-lactamase (NDM) enzyme-producing CPEs being one of the major causative agents of healthcare settings infections. In this study, ... ...

    Abstract The increase in the prevalence of carbapenem-producing Enterobacterales (CPE) is a major threat, with the New Delhi metallo-β-lactamase (NDM) enzyme-producing CPEs being one of the major causative agents of healthcare settings infections. In this study, we characterized an IncX3 plasmid harboring
    Language English
    Publishing date 2024-04-12
    Publishing country England
    Document type Journal Article
    ZDB-ID 2835763-2
    ISSN 2405-8440
    ISSN 2405-8440
    DOI 10.1016/j.heliyon.2024.e29642
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