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Science China Mathematics 2013年第6期56卷 1213-1231页

作者： zeng qingping ZHONG HuaiJie WU ZhenYing School of Mathematics and Computer Science Fujian Normal University Fuzhou Strait Vocation Technological College

Motivated by a paper of Fang (2009), we study the Samuel multiplicity and the structure of essentially semi-regular operators on an infinite-dimensional complex Banach space. First, we generalize Fang's results concerning Samuel multiplicity from semi-Fredholm operators to essentially semi-regular operators by elementary methods in operator theory. Second, we study the structure of essentially semi-regular operators. More precisely, we present a revised version of Fang's 4 × 4 upper triangular model with a little modification, and prove it in detail after providing numerous preliminary results, some of which are inspired by Fang's paper. At last, as some applications, we get the structure of semi-Fredholm operators which revised Fang's 4 × 4 upper triangular model, from a different viewpoint, and characterize a semi-regular point λ∈ C in an essentially semi-regular domain.

关键词： samuel multiplicity essentially semi-regular operators semi-Fredholm operators semi-regularoperators Kato decomposition

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Local Spectral Properties under Perturbations

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Journal of Mathematical Research with Applications 2015年第2期35卷 211-214页

作者： qingping zeng College of Computer and Information Sciences Fujian Agriculture and Forestry University

It is shown that local spectral properties such as the single-valued extension property, Dunford’s property(C), Bishop’s property(β), the decomposition property(δ), or decomposability are stable under commuting pe... 详细信息

关键词： Local spectral property perturbation algebraic operator

On Power Finite Rank Operators

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Journal of Mathematical Research with Applications 2019年第4期39卷 378-382页

作者： qingping zeng Zhenying WU College of Computer and Information Sciences Fujian Agriculture and Forestry University College of Mathematics and Informatics Fujian Normal University

An operator F ∈ B（X） is called power finite rank if F;is of finite rank for some n ∈ *** this note, we provide several interesting characterizations of power finite rank operators. In particular, we show that the class of power finite rank operators is the intersection of the class of Riesz operators and the class of operators with eventual topological uniform descent.

关键词： power finite rank operator Drazin invertible eventual topological uniform descent Riesz operator

Artemisinin mimics calorie restriction to extend yeast lifespan via a dual-phase mode: a conclusion drawn from global transcriptome profiling

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Science China(Life Sciences) 2015年第4期58卷 451-465页

作者： WANG DaTing WU Ming LI SiMing GAO Qian zeng qingping Tropical Medicine Institute Guangzhou University of Chinese Medicine School of life Science Sun Yat-sen University The Second Affiliated Hospital Guangzhou University of Chinese Medicine

Calorie restriction(CR) promotes longevity among distinct organisms from yeast to mammals. Although CR-prolonged lifespan is believed to associate with enhanced respiratory activity, it is apparently controversial for accelerated energy consumption regardless of insufficient nutrient intake. In reconciling the contradiction of less food supply versus much metabolite dispense, we revealed a CR-based mode of dual-phase responses that encompass a phase of mitochondrial enhancement(ME) and a phase of post-mitochondrial enhancement(PME), which can be distinguished by the expression patterns and activity dynamics of mitochondrial signatures. ME is characterized by global antioxidative activation, and PME is denoted by systemic metabolic modulation. CR-mediated aging-delaying effects are replicated by artesunate, a semi-synthetic derivative of the antimalarial artemisinin that can alkylate heme-containing proteins, suggesting artesunate-heme conjugation functionally resembles nitric oxide-heme interaction. A correlation of artesunate-heme conjugation with cytochrome c oxidase activation has been established from adduct formation and activity alteration. Exogenous hydrogen peroxide also mimics CR to trigger antioxidant responses, affect signaling cascades, and alter respiratory rhythms, implying hydrogen peroxide is engaged in lifespan extension. Conclusively, artesunate mimics CR-triggered nitric oxide and hydrogen peroxide to induce antioxidative networks for scavenging reactive oxygen species and mitigating oxidative stress, thereby directing metabolic conversion from anabolism to catabolism, maintaining essential metabolic functionality, and extending life expectancy in yeast.

关键词： calorie restriction nitric oxide artesunate hydrogen peroxide longevity Saccharomyces cerevisiae

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ON THEORY OF RELATIVITY IN MASS SPECTROMETER

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质谱学报 1999年第Z1期 17-18页

作者： zeng qingping (No.117, Air Force RadarAcademy, Wuhan 430010, China)

2,4-Dinitrophenol Downregulates Genes for Diabetes and Fatty Liver in Obese Mice

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Journal of Biosciences and Medicines 2015年第9期3卷 44-51页

作者： Qian Gao Jiang He Tao Liao qingping zeng Tropical Medicine Institute Guangzhou University of Chinese Medicine Guangzhou China

Whether obesity is a disease or a risk factor of metabolic diseases including type 2 diabetes and fatty liver remains debating, we report here that a high-fat diet (HFD) alone or HFD-combined intramuscular injection with a high dose (1.2 mg/kg) of lipopolysaccharide (LPS) induces mouse peripheral noninflammatory obesity. In contrast, HFD-combined intraperitoneal injection with a low dose (0.25 mg/kg) of LPS induces mouse visceral low-grade inflammatory obesity. While the noninsulin-dependent diabetes mellitus (NIDDM) and nonalcoholic fatty liver disease (NAFLD)- related genes are globally upregulated in HFD + low-dose LPS mice, NIDDM and NAFLD genes are not extensively upregulated in HFD + high-dose LPS mice. The mitochondrial uncoupler 2,4-dini- trophenol (DNP) in the dosage of 16 mg/kg was found to exert a weight-reducing effect in obese mice by compromising NF-κB-primed inflammatory responses, thereby down regulating NIDDM and NAFLD genes. Conclusively, mouse visceral low-grade inflammatory obesity that predisposes NIDDM and NAFLD can be ameliorated by DNP via anti-inflammation.

关键词： Obesity Metabolic Disease Low-Grade Inflammation 2 4-Dinitrophenol Anti-Inflammation

Questions On Electromagnetic Field Theory

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Questions On Electromagnetic Field Theory