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A HALF-CENTERED STAR-OPERATION ON AN INTEGRAL DOMAIN
Qiao, Lei,Wang, Fanggui Korean Mathematical Society 2017 대한수학회지 Vol.54 No.1
In this paper, we study the natural star-operation defined by the set of associated primes of principal ideals of an integral domain, which is called the g-operation. We are mainly concerned with the ideal-theoretic properties of this star-operation. In particular, we investigate DG-domains (i.e., integral domains in which each ideal is a g-ideal), which form a proper subclass of the DW-domains. In order to provide some original examples, we examine the transfer of the DG-property to pullbacks. As an application of the g-operation, it is shown that w-divisorial Mori domains can be seen as a Gorenstein analogue of Krull domains.
REGULARITY RELATIVE TO A HEREDITARY TORSION THEORY FOR MODULES OVER A COMMUTATIVE RING
Qiao, Lei,Zuo, Kai Korean Mathematical Society 2022 대한수학회지 Vol.59 No.4
In this paper, we introduce and study regular rings relative to the hereditary torsion theory w (a special case of a well-centered torsion theory over a commutative ring), called w-regular rings. We focus mainly on the w-regularity for w-coherent rings and w-Noetherian rings. In particular, it is shown that the w-coherent w-regular domains are exactly the Prüfer v-multiplication domains and that an integral domain is w-Noetherian and w-regular if and only if it is a Krull domain. We also prove the w-analogue of the global version of the Serre-Auslander-Buchsbaum Theorem. Among other things, we show that every w-Noetherian w-regular ring is the direct sum of a finite number of Krull domains. Finally, we obtain that the global weak w-projective dimension of a w-Noetherian ring is 0, 1, or ∞.
Lei Qiao,Chao Dong,Jiaojiao Zhang,Gang Sun 대한약리학회 2023 The Korean Journal of Physiology & Pharmacology Vol.27 No.2
Triple-negative breast cancer (TNBC) is the most aggressive subtype of breast cancer and current therapeutic strategies are limited in their effectiveness. The expressions of Rab5 and the M2 tumor-associated macrophage marker CD163 in tissues were detected by Western blot. The migration and invasion of cells were determined using a Transwell assay. The expressions of the exosome markers were evaluated by Western blot. The polarization of human macrophages (THP-1) was determined by incubation of THP-1 cells with conditioned medium or exosomes collected from MDA-MB-231 cells with indicated transfections or by a coculture system of THP-1 and MDA-MB-231 cells. The M1 and M2 macrophage markers were evaluated by qRT-PCR. The expression of Rab5 in TNBC was significantly higher than that in normal breast tissue. Rab5 expressions in triple-negative and luminal A breast cancer were higher than those in other molecular subtypes. Higher CD163 expression was observed in triple-negative breast cancer and in triple-negative and luminal B subtypes. Rab5 knockdown suppressed but Rab5 overexpression promoted the migration and invasion capacity of MDA-MB-231 cells. The levels of CD63 and CD9 in the medium of Rab5 knockdown cells were lower than those in control cells, whereas higher levels of CD63 and CD9 were observed in Rab5 overexpression cells. Rab5 knockdown decreased the excretion but did not alter the diameter of the exosomes. Knockdown of Rab5 facilitated the anti-tumor polarization of macrophages, which was partially reversed by Rab5 overexpression. Therefore, Rab5 is expected to be a potential therapeutic target for triple-negative breast cancer.
A HALF-CENTERED STAR-OPERATION ON AN INTEGRAL DOMAIN
Lei Qiao,Fanggui Wang 대한수학회 2017 대한수학회지 Vol.54 No.1
In this paper, we study the naturalstar-operation defined by the set of associated primes of principal ideals of an integral domain, which is called the $g$-operation. We are mainly concerned with the ideal-theoretic properties of this star-operation. In particular, we investigate DG-domains (i.e., integral domains in which each ideal is a $g$-ideal), which form a proper subclass of the DW-domains. In order to provide some original examples, we examine the transfer of the DG-property to pullbacks. As an application of the $g$-operation, it is shown that $w$-divisorial Mori domains can be seen as a Gorenstein analogue of Krull domains.
Exogenous Spermidine Promoted Ca2+ Absorption in Lettuce Roots and Reduced the Incidence of Tipburn
Qiao Yang,Na Lu,Lei Wang,Xiao-qing Huang,Da-quan Yang,Jin Sun 한국원예학회 2018 원예과학기술지 Vol.36 No.5
A physiological disorder, called tipburn, commonly occurs in lettuce (Lactuca sativa L.), particularly in greenhouse cultivation and in hot seasons, and reduces its marketability. Calcium (Ca) deficiency is the main cause of tipburn injury. In the present study, we investigated the effect of exogenous spermidine (Spd) on the occurrence of tipburn in hydroponically cultivated head lettuce (var. capitata L.) and elucidated the role of Ca ions (Ca2+) in its prevention with respect to absorption and transport. Ca deficiency in the nutrient solution resulted in reduced uptake of Ca2+ in lettuce roots, thereby resulting in Ca deficiency in leaves, leading to leaf senescence and tipburn. An application of exogenous Spd promoted Ca2+ uptake in lettuce roots under Ca deficiency and promoted Ca2+ transportation to leaves, especially to inner leaves, thus delaying leaf senescence and reducing the incidence of tipburn. The results indicated that application of exogenous Spd is an effective method to decrease tipburn in lettuce caused by Ca deficiency.
Lei Zhang,Fengqiong Yu,Qian Hu,Yuxi Qiao,Rongrong Xuan,Gongjun Ji,Chunyan Zhu,Chunlan Cai,Kai Wang 대한신경정신의학회 2020 PSYCHIATRY INVESTIGATION Vol.17 No.9
Objective Attentional biases toward emotional scenes may represent vulnerability and maintenance factors in depression. Antidepressant therapy may improve cognitive function and reduce depression, and is considered as the mechanism of action of antidepressants. Therefore, we conducted an eye-tracking test to examine whether selective serotonin re-uptake inhibitor (SSRI) antidepressants can reduce negative attentional biases and elicit clinical responses in depression. Methods Twenty first-episode depressive patients freely viewed three types of pictures that depicted different emotional scenes (i.e., positive-control, neutral-control, and negative-control) for 4,000 ms while their eye movements were monitored. The attentional bias to different emotional scenes was assessed before and after eight weeks of SSRI treatment using the eye-tracking method. The control group included a group of healthy individuals. Results The results revealed that first-episode depressive patients oriented their gaze more frequently to negative images and less to happy images, compared to controls. Importantly, the attentional bias in depressive patients was regulated after eight weeks of SSRI treatment. Patients showed an increased tendency to fixate on positive images and a decreased tendency to focus on negative images. Conclusion This suggests that SSRI antidepressants decrease vulnerability to negative images, while having an effect on attention in respect to positive images.
Cockroach as a Vector of Blastocystis sp. is Risk for Golden Monkeys in Zoo
Lei Ma,Yongbin Zhang,Haixia Qiao,Shuai Li,Heqin Wang,Ningning Zhang,Xiao Zhang 대한기생충학열대의학회 2020 The Korean Journal of Parasitology Vol.58 No.5
Blastocystis sp. is a kind of protozoa living in the intestinal tract of human and animals, which will cause intestinal diseases such as diarrhea, abdominal distension and vomiting. This paper was aimed to understand the infection of Blastocystis sp. In golden monkeys and the transmission path in North China. Thirty-seven feces samples from golden monkeys and 116 cockroach samples from Shijiazhuang Zoo were collected from July to October 2019 for PCR analysis of Blastocystis sp. Genetic diversity analysis was further conducted on the samples with positive PCR results. The results showed that the infection rate was 48.7% (18/37) in golden monkeys and 82.8% (96/116) in cockroaches, respectively. The genetic evolution analysis based on small subunit ribosomal RNA demonstrated that three subtypes (ST) of Blastocystis sp. including ST1, ST2, and ST3 existed in the intestinal tract of golden monkeys, while only ST2 was detected in the intestinal tract of cockroaches. This paper may provide supports for the quarantine and control of Blastocystis sp. for the zoo in Northern China.
An investigation and forecast on CO₂ emission of China
Lei Wen,Zeyang Ma,Yue Li,Qiao Li 대한환경공학회 2017 Environmental Engineering Research Vol.22 No.4
CO₂ emission is increasingly focused by public. Beijing and Tianjin are conceived to be a new economic point of growth in China. However, both of them are suffering serious environmental stress. In order to seek for the effect of socioeconomic factors on the CO₂ emission of this region, a novel methodology –symbolic regression– is adopted to investigate the relationship between CO₂ emission and influential factors of Beijing and Tianjin. Based on this method, CO₂ emission models of Beijing and Tianjin are built respectively. The models results manifested that Beijing and Tianjin own different CO₂ emission indicators. The RMSE of models in Beijing and Tianjin are 255.39 and 603.99, respectively. Further analysis on indicators and forecast trend shows that CO₂ emission of Beijing expresses an inverted-U shaped curve, whilst Tianjin owns a monotonically increasing trend. From analytical results, it could be argued that the diversity rooted in different development orientation and the mixture of different natural and industrial environment. This research further expands the investigation on CO₂ emission of Beijing and Tianjin region, and can be used for reference in the study of carbon emissions in similar regions. Based on the investigation, several policy suggestions are presented.