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Gorenstein dimensions of unbounded complexes and change of base (with an appendix by Driss Bennis)

Science China Mathematics 2017年第3期60卷 401-420页

作者： CHRISTENSEN Lars Winthe koksal fatih LIANG Li Department of Mathematics and Statistics Texas Tech University Lubbock TX 79409 USA Department of Computer and Mathematical Sciences Lewis University Romeoville IL 60446 USA School of Mathematics and Physics Lanzhou Jiaotong University Lanzhou 730070 China

For a commutative ring R and a faithfully fiat R-algebra S we prove, under mild extra assumptions, that an R-module M is Gorenstein flat if and only if the left S-module S R M is Gorenstein flat, and that an R-module N is Gorenstein injective if and only if it is cotorsion and the left S-module Homn（S, N） is Gorenstein injective. We apply these results to the study of Gorenstein homological dimensions of unbounded complexes. In particular, we prove two theorems on stability of these dimensions under faithfully flat （co-）base change.

关键词： Gorenstein injective dimension faithfully flat co-base change Corenstein flat dimension faithfullyflat base change

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Association of CagA and VacA presence with ulcer and non-ulcer dyspepsia in a Turkish population

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World Journal of Gastroenterology 2003年第7期9卷 1580-1583页

作者： Kantarceken Bulent Aladag Murat Atik Esin koksal fatih Harputluoglu MMMurat Harputluoglu Hakan Karincaoglu Melih Ares Mehmet Yildirim Bulent Hilmioglu fatih Division of Gastroenterology Medical FacultyInonu UniversityMalatyaTurkey Mustafa Kemal University Department of PathologyMedical FacultyHatayTurkey Department of Microbiology Medical Faculty Cukurova UniversityAdanaTurkey Department of Internal Medicine Medical FacultyInonu UniversityMalatyaTurkey

AIM:The mostly known genotypic virulence features,of *** are cytotoxin associated gene A (cagA) and Vacuolating cytotoxin gene A (VacA).We investigated the association of these major virulence factors with ulcer and non-ulcer dyspepsia in our region. METHODS:One hundred and forty two dyspeptic patients were studied (average age 44.8±15.9 years,range 15-87 years,64 males and 78 females).Antral and corpus biopsies were taken for detecting and genotyping of ***.107 patients who were *** positive by histological assessment were divided into three groups according to endoscopic findings:Duodenal ulcer (DU),gastric ulcer (GU) and non-ulcer dyspepsia (NUD).The polymerase chain reaction (PCR) was used to detect CagA and VacA genes of *** using specific primers. RESULTS:*** isolated from 75.4% (107/142) of the *** the 107 patients,66 (61.7%) were cagA- positive and 82 (76.6%) were *** gene was positively associated with DU and GU (P0.05).Although VacA positivity in ulcer patients was higher than that in NUD group,the difference was not statistically significant (P>0.05). CONCLUSION:There is a significantly positive association between CagA genes and DU and *** presence of VacA is not a predictive marker for DU,GU,and NUD in our patients.

关键词： Adolescent Adult Aged Aged, 80 and over Antigens, Bacterial Bacterial Proteins Biopsy Dyspepsia Female Genotype Helicobacter Infections Helicobacter pylori Humans Male Middle Aged Predictive Value of Tests Prevalence Stomach Ulcer Turkey Virulence

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