The preparation, performance and lithiation mechanism of cobalt-doped zinc oxide as a high performance anode material for LIB

Yue Li,WanWan Li,Minhua Fang,XiaoLin Yao,Chao Chen,Miao Shui,Jie Shu,Yuanlong Ren 한국물리학회 2017 Current Applied Physics Vol.17 No.8

Zn1-xCoxO (0 x 0.15) anode material was prepared by an easy polyacrylamide assisted sol-gel route. The successful replacement of Zinc by Cobalt within Cobalt content x 0.09 was confirmed by structural characterization. The introduction of Cobalt element greatly improved the electro-chemical performances of the matrix Zinc oxide. Without carbon coating, at the 20th cycle, Zn0.91Co0.09O anode still preserved a capacity a little bit more than 1000 mA h g1 and a capacity more than 600 mA h g1 was retained at the end of the 50th cycle. Better rate capability was also witnessed. The SEM, EIS at OCV, CV and in situ XRD were further carried out to elucidate the lithiation mechanism. The role Cobalt doping played can be summarized as follows: the stabilization of the Li2Zn phase, the minimization of charge transfer resistance and the enhanced reversibility of the reduction from metal oxide to metal.

Microstructure evolution and enhanced vacuum tribological performance of Ni-doped WS₂ composite coating

Xu, Shu-Sheng,Weng, Li-Jun,Liu, Yu-Zhen,Kang, Kyeong-Hee,Kim, Chang-Lae,Kim, Dae-Eun Elsevier Sequoia 2017 Surface & coatings technology Vol.325 No.-

<P><B>Abstract</B></P> <P>Ni-doped WS<SUB>2</SUB> composite coatings with various Ni contents were co-deposited using a radio frequency sputtering system on silicon wafer and AISI 440C stainless steel substrates. The microstructural characteristics of the WS<SUB>2</SUB>-Ni composite coatings and their tribological properties in vacuum were assessed. During introduction of Ni dopant in the WS<SUB>2</SUB>-Ni composite coating the sulfur/tungsten (S/W) ratio in the coating increased due to reduced preferential resputtering of sulfur atoms in the growing coating. The microstructure of the WS<SUB>2</SUB>-Ni composite coating varied from a fine columnar structure for Ni content equal to or less than 7.7at.% to a featureless structure as the Ni content increased further. The Ni dopant inhibited the growth of the coarse columnar WS<SUB>2</SUB> platelets which was accompanied by nanocrystallization and amorphization of the composite coating structure. WS<SUB>2</SUB>-Ni composite coatings with fine columnar structure exhibited relatively low hardness but showed a high tendency to form a lubricating transfer layer. It also demonstrated low brittleness and prolonged wear life in vacuum condition compared to coatings with dense featureless structure. The variation in tribological performance between the composite coatings resulted from the different wear mechanisms associated with their distinct microstructures.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Microstructure of WS<SUB>2</SUB> coating was modified by incorporating Ni as a dopant. </LI> <LI> The introduction of Ni increased the S/W ratio of the WS<SUB>2</SUB> composite coating. </LI> <LI> High Ni content in the WS<SUB>2</SUB> coating led to high brittleness and low wear resistance. </LI> <LI> WS<SUB>2</SUB>–5at.% Ni coating showed 5 times longer wear life than pure WS<SUB>2</SUB> film in vacuum. </LI> <LI> Superior tribological properties were attributed to transfer layer and high hardness. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

Comparative analysis of type 2 diabetes-associated gut microbiota between Han and Mongolian people

Shu-chun Li,Yao Xiao,Ri-tu Wu,Dan Xie,Huan-hu Zhao,Gang-yi Shen,En-qi Wu 한국미생물학회 2021 The journal of microbiology Vol.59 No.7

Due to the different rates of diabetes in different ethnic groupsand the structural differences in intestinal microbiota, thisstudy evaluated the changes in diabetes-related intestinal microbiotain two ethnic groups. Fifty-six stool samples werecollected from subjects from the Han and Mongolian ethnicgroups in China, including participants without diabetes(non-diabetic, ND) and with type 2 diabetes (T2D). The 16SrDNA gene V3 + V4 area was extracted from microbiota,amplified by PCR, and used to perform high-throughput sequencingand screen differential microbiota associated withethnicity. The results showed that there were 44 T2D-relatedbacterial markers in the Han subjects, of which Flavonifractor,Alistipes, Prevotella, Oscillibacter, Clostridium XlVa,and Lachnospiracea_incertae_sedis were most closely relatedto diabetes. There were 20 T2D-related bacterial markers inthe Mongolian subjects, of which Fastidiosipila and Barnesiellawere most closely related to diabetes. The commonmarkers of T2D bacteria in the two ethnic groups were Papillibacterand Bifidobacterium. There were 17 metabolic pathwayswith significant differences between the ND and T2Dgroups in the Han group, and 29 metabolic pathways in theMongolian group. The glutamatergic metabolic pathway wasthe only common metabolic pathway in two ethnic groups. The composition and function of diabetes-related bacteriawere significantly different among the different ethnic groups,which suggested that the influence of ethnic differences shouldbe fully considered when studying the association betweendiabetes and bacteria. In addition, the common bacterialmarkers found in diabetic patients of different ethnic groupsin this study can be used as potential targets to study the pathogenesisand treatment of diabetes.

Study on the mechanism of desulfurization and denitrification catalyzed by TiO2 in the combustion with biomass and coal

Shu Qin Wang,Ming-Zhu Liu,Li-Li Sun,Wei Liang Cheng 한국화학공학회 2017 Korean Journal of Chemical Engineering Vol.34 No.6

The effects of Ca/S molar ratio, catalyst type, catalyst dosage, temperature on desulfurization and denitrification efficiency were investigated in the coal-powder combustion with corn cobs as biomass. The thermal characteristics of Shanxi coal and corn cob blends with V-TiO2 were evaluated by thermogravimetric analyzer. The catalytic mechanisms of V-TiO2 on combustion, desulfurization and denitrification were discussed, suggesting that the mechanisms are in good agreement with the experimental data. The results show that the control parameters of the ideal desulfurization and denitrification efficiency should follow that the dosage of V-TiO2 catalyst is 8% with a Ca/S ratio of 2.3 at a treatment temperature 850 oC. Meanwhile, the combustion efficiency could be effectively improved with the mixture of corn cob and V-TiO2. The thermal characteristics of coal char and corn cob char blends with V-TiO2 were evaluated using thermogravimetric analysis and derivative thermogravimetry methods to discuss the heterogeneous NO reduction mechanisms. The results show that the biomass chars were more active than coal chars in reducing NO, and the specific surface area of the chars was increased with V-TiO2, which indicates that V-TiO2 exhibits significant influence on catalytic combustion, desulfurization and denitrification.

Combining Genome Shuffling with Streptomycin Resistance to Improve Poly-γ-L-diaminobutanoic Acid Production in Bacillus pumilus

Shu Li,Liang Wang,Nan Wang,Wei Cong 한국생물공학회 2021 Biotechnology and Bioprocess Engineering Vol.26 No.4

A breeding approach combining genome shuffling with streptomycin resistance was developed in this research to improve the poly-γ-L-diaminobutanoic acid (γ-PAB) production in Bacillus pumilus LS-1. By this unique strategy, recombinants from the third round of genome shuffling could tolerate 18 μg/L of streptomycin and exhibited higher γ-PAB yield as 152.2 mg/L in shakeflask fermentation, 3-fold over the parent. In batch fermentation, B. pumilus GS3-9 could produce γ-PAB as high as 1284.7 mg/L in two days, 2.4-fold higher than the control, which was the highest productivity ever reported. In addition, the optimal pH in B. pumilus for γ-PAB synthesis was changed after atmospheric and room temperature plasma (ARTP) mutagenesis and protoplast fusion, because lower pH environment is favorable for accumulation of intracellular ATP. Some key enzymes in GS3-9 showed higher activities than those in parent, suggesting a greater flux to TCA circle and DAP pathway, which was a reason for enhanced γ-PAB production.

Comparison of Pre-Operation Diagnosis of Thyroid Cancer with Fine Needle Aspiration and Core-needle Biopsy: a Meta-analysis

Li, Lei,Chen, Bao-Ding,Zhu, Hai-Feng,Wu, Shu,Wei, Da,Zhang, Jian-Quan,Yu, Li Asian Pacific Journal of Cancer Prevention 2014 Asian Pacific journal of cancer prevention Vol.15 No.17

Background: The aim of this meta-analysis was to compare sensitivities and specificities of fine needle aspiration (FNA) and core needle biopsy (CNB) in the diagnosis of thyroid cancer. Materials and Methods: Articles were screened in Medline, the Cochrane Library, EMBASE and Google Scholar, and subsequently included and excluded based on the patient/problem-intervention-comparison-outcome (PICO) principle. Primary outcome was defined in terms of diagnostic values (sensitivity and specificity) of FNA and CNB for thyroid cancer. Secondary outcome was defined as the accuracy of diagnosis. Compiled FNA and CNB results from the final studies selected as appropriate for meta-analysis were compared with cases for which final pathology diagnoses were available. Statistical analyses were performed for FNA and CNB for all of the selected studies together, and for individual studies using the leave-one-out approach. Results: Article selection and screening yielded five studies for meta-analysis, two of which were prospective and the other three retrospective, for a total of 1,264 patients. Pooled diagnostic sensitivities of FNA and CNB methods were 0.68 and 0.83, respectively, with specificities of 0.93 and 0.94. The areas under the summary ROC curves were 0.905 (${\pm}0.030$) for FNA and 0.745 (${\pm}0.095$) for CNB, with no significant difference between the two. No one study had greater influence than any other on the pooled estimates for diagnostic sensitivity and specificity. Conclusions: FNA and CNB do not differ significantly in sensitivity and specificity for diagnosis of thyroid cancer.

Screening of Endophytic Antagonistic Bacterium from Phellodendron amurense and Their Biocontrol Effects against Canker Rot

Shu-Jiang Li,Xinmei Fang,Hanlian Zhang,Yanling Zeng,Tian-Hui Zhu 한국식물병리학회 2019 Plant Pathology Journal Vol.35 No.3

Thirty-four strains of bacteria were isolated from Phellodendron amurense. Using Nectria haematococca as an indicator strain, the best strain, B18, was obtained by the growth rate method. The morphological, physiological and biochemical characteristics of strain B18 and its 16S DNA gene sequence were identified, and the biocontrol effect of strain B18 was assessed in pot and field tests, as well as in a field-control test. Drilling methods were used to determine the antibacterial activity of metabolites from strain B18 and their effects on the growth of pathogen mycelia and spores. The best bacteriostatic rate was 85.4%. B18 can hydrolyse starch and oxidize glucose but does not produce gas; a positive result was obtained in a gelatine liquefaction test. According to 16S DNA gene sequencing, strain B18 is Bacillus methylotrophicus (GenBank accession number: MG457759). The results of pot and field-control trials showed 98% disease control when inoculating 108 cfu/ ml of the strain. The disease control effect of the B18 culture liquid (concentrations of 108, 2 × 106, 106, 5 × 105 and 2.5 × 105 cfu/ml) in the field-control test was higher than 80%, and the cure rate of the original delivery solution was 96%. Therefore, in the practical forestry production, a 2.5 × 105 cfu/ml culture liquidshould be applied in advance to achieve good control effects.

Descending projections from the nucleus accumbens shell excite activity of taste-responsive neurons in the nucleus of the solitary tract in the hamster

Li, Cheng-Shu,Lu, Da-Peng,Cho, Young K. American Physiological Society 2015 Journal of neurophysiology Vol.113 No.10

<P>The nucleus of the solitary tract (NST) and the parabrachial nuclei (PbN) are the first and second relays in the rodent central taste pathway. A series of electrophysiological experiments revealed that spontaneous and taste-evoked activities of brain stem gustatory neurons are altered by descending input from multiple forebrain nuclei in the central taste pathway. The nucleus accumbens shell (NAcSh) is a key neural substrate of reward circuitry, but it has not been verified as a classical gustatory nucleus. A recent in vivo electrophysiological study demonstrated that the NAcSh modulates the spontaneous and gustatory activities of hamster pontine taste neurons. In the present study, we investigated whether activation of the NAcSh modulates gustatory responses of the NST neurons. Extracellular single-unit activity was recorded from medullary neurons in urethane-anesthetized hamsters. After taste response was confirmed by delivery of sucrose, NaCl, citric acid, and quinine hydrochloride to the anterior tongue, the NAcSh was stimulated bilaterally with concentric bipolar stimulating electrodes. Stimulation of the ipsilateral and contralateral NAcSh induced firings from 54 and 37 of 90 medullary taste neurons, respectively. Thirty cells were affected bilaterally. No inhibitory responses or antidromic invasion was observed after NAcSh activation. In the subset of taste cells tested, high-frequency electrical stimulation of the NAcSh during taste delivery enhanced taste-evoked neuronal firing. These results demonstrate that two-thirds of the medullary gustatory neurons are under excitatory descending influence from the NAcSh, which is a strong indication of communication between the gustatory pathway and the mesolimbic reward pathway.</P>

Exploring the Effects of Music Therapy on Anxiety in Breast Cancer Patients during Chemotherapy

Shu-Yen Li,Hsiu-Fang Hsieh,Huey-Shyan Lin,Yan-Chiou Ku,Chin-Chung Chen 한국간호과학회 2009 한국간호과학회 학술대회 Vol.2009 No.10

Auricular acupressure promotes uterine involution after cesarean section: A randomized controlled trial

Shu-xin Wang,Jing-chun Zeng,Ting Li,Wan-lan Zhang,Yan-fang Li,Run-jin Zhou,Zi-jun Liu,Yu-ling Liu,Xun Zhuang,Rui Zhang,Li-ming Lu,Guo-hua Lin 한국한의학연구원 2021 Integrative Medicine Research Vol.10 No.3

Background: Postpartum subinvolution of the uterus is a more common condition after cesarean section. Auricular acupressure (AA) is widely used for the treatment of postpartum diseases. However, few studies have explored the effects of AA as a treatment of uterine involution following cesarean section to date. This study aimed to assess the efficacy and safety of AA for uterine involution after cesarean section. Methods: A total of 109 women who underwent cesarean section participated in this study. They were randomly allocated to either real AA or sham AA in a 1:1 ratio by a computer program. For 3 days, the real AA and sham AA groups received treatment 3 times daily. A series of assessments at 42 days after cesarean section, namely on the uterine size, the incidence of hydrometra, the first anal exsufflation time, bleeding volume at 6 hours, bleeding volume at 6–24 hours along with other general assessments were carried out. Results: A total of 89 women completed the study. The uterine size at 42 days after a cesarean section was 6.3 cm smaller in the real AA group than in the sham AA group (P < 0.01). The incidence of hydrometra on day 42 postpartum was lower in the real AA group than in the sham AA group (P < 0.01). The lochia duration and the first anal exsufflation time after cesarean section were shorter in the real AA group than in the sham AA group (P < 0.05). Conclusion: AA improves uterine involution after cesarean section. Trial registration: ChiCTR1800015569.