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Articles by D. Li
Total Records ( 9 ) for D. Li
  D. Li , H.N. Chen and H. Xu
  A nanostructured surface layer was formed on a carbon steel by means of surface mechanical attrition treatment (SMAT). The microstructure of the surface layer of the SMATed sample was characterized by using scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Microhardness and residual stress distribution along the depth from the SMATed surface layer were measured at the same time. Fatigue behaviors of the carbon steel subjected to the SMAT process were investigated. A nanostructured layer with average grains size of ~12.7nm was formed, of which microhardness is more than twice as high as that in matrix and residual compressive stress can reach about −400MPa with maximum depth of ~600μm. The fatigue strength of as-received sample is 267MPa and that of SMATed sample is 302MPa based on fatigue life 5×106cycles. The SMAT process has improved the fatigue strength by as much as 13.1% for the carbon steel. It is shown that the SMAT is an effective method to render the material with the features, such as a nanostructured and work-hardened surface layer as well as compressive residual stresses, which can pronouncedly improve the fatigue strength of the carbon steel.
  H. Liu , G. Li , W. Zhong , D. Li , F. Liu and W. Sun
  Essential amino acids, particularly those containing the element sulfur, are required by small canids to produce a high quality pelt. The experiments were designed to estimate the effect of a diet supplemented with the sulfur-containing amino acid methionine on the nutrient metabolism and pelt quality of raccoon dogs (Nyctereutes procyonoides). Seventy-five male raccoon dogs with similar body weights were randomly assigned to five dietary groups of 15 each during the winter fur growth period. The diet for the control group contained 24% protein while the diets for groups 1 to 4 contained 20% protein plus 0.15, 0.35, 0.55 and 0.75 g methionine per 100 g dry matter, respectively, for a 60-day period. As a result, the body weights in group 4 were clearly reduced compared to the other groups (p<0.05). Dry matter intake in the control group was significantly higher than for groups 1 and 2 (p<0.05), but was similar to groups 3 and 4. Although, serum methionine level was similar among all groups, group 2 showed significantly higher total protein in serum (p<0.05) than the control group; while serum urea nitrogen in group 2 was lower than that of groups 3 or 4 (p<0.05). The pelt length in the control group and in group 2 was significantly longer than the other groups. The density of guard hair and fiber in the controls and groups 1 and 2 was remarkably higher compared with that in groups 3 and 4 (p<0.05). These results suggest that a certain amount of supplemental methionine may reduce the total protein requirement in the diet without affecting the pelt quality of raccoon dogs.
  H Tang , X Dong , R. S Day , M. M Hassan and D. Li
 

To test the hypothesis that polymorphic variants of antioxidant genes modify the risk of pancreatic cancer, we examined seven single-nucleotide polymorphisms (SNPs) of genes coding for superoxide dismutase (SOD) 2, glutathione S-transferase alpha 4 (GSTA4), catalase and glutathione peroxidase in 575 patients with pancreatic adenocarcinoma and 648 healthy controls in a case–control study. Information on risk factors was collected by personal interview and dietary information was collected by a self-administered food frequency questionnaire. Genotypes were determined using the Taqman method. Adjusted odds ratio (AOR) and 95% confidence interval (CI) were estimated by unconditional logistic regression. No significant main effect of genotype was observed. A borderline significant interaction between diabetes and SOD2 Ex2+24T>C CT/TT genotype was observed (Pinteraction = 0.051); the AORs (95% CI) were 0.98 (0.73–1.32) for non-diabetics carrying the CT/TT genotype, 1.73 (0.94–3.18) for diabetics carrying the CC genotype and 3.49 (2.22–5.49) for diabetics carrying the CT/TT genotype compared with non-diabetics carrying the CC genotype. Moreover, the SOD2 –1221G>A AA genotype carriers had a significantly increased risk for pancreatic cancer among those with a low dietary vitamin E intake but decreased risk among those with a high vitamin E intake (Pinteraction = 0.002). There was a non-significant interaction between diabetes and GSTA4 Ex5–64G>A genotypes (Pinteraction = 0.078). No significant interaction between genotype with cigarette smoking or vitamin C intake was observed. These data suggest that genetic variations in antioxidant defenses modify the risk of pancreatic cancer in diabetics or individuals with a low dietary vitamin E intake.

  D. Li , X. Hou , X. Ma , W. Zong , X. Shao , H. Lu , K. Xiang and W. Jia
  Aims  The overwhelming majority of subjects with normal glucose regulation have the highest plasma glucose concentration at 30 minutes during oral glucose tolerance. We aimed to examine the association between increment of 30-min post-challenge glucose and albuminuria in participants with normal glucose regulation.

Methods  A population-based cross-sectional study was conducted in six communities in Shanghai between 2007 and 2008. A total of 3508 subjects with normal glucose regulation had complete data and were enrolled into the analysis. Among the selected subjects, only 1525 individuals (581 men, 944 women) were examined for their serum insulin levels. We assessed post-challenge blood glucose and insulin at 0, 30 and 120 min, urinary albumin and creatinine. The 30-min post-challenge glucose increment (Δ) was calculated as 30-min post-challenge glucose minus fasting plasma glucose, and albumin/creatinine ratio was used to reflect urinary albumin excretion.

Results  Multivariable logistic regression analysis revealed that the Δ30-min post-challenge glucose was independently associated with increased albumin/creatinine ratio in men with normal glucose regulation (OR = 1.08, = 0.025), but not in women. Furthermore, multivariable linear regression analysis revealed that early-phase glucose disposition index was the main factor responsible for Δ30-min post-challenge glucose and explained 14-20% of the variance of Δ30-min post-challenge glucose in the two subgroups (< 0.05). Notably, men had higher Δ30-min post-challenge glucose and lower early-phase glucose disposition index than women (all P < 0.001).

Conclusions  The 30-min post-challenge plasma glucose increment is associated with urine albumin excretion in men with normal glucose regulation.

  Y. Norma-Rashid , N.A. Rahman and D. Li
  This study examines the diversity and distribution of spiders in the mangrove areas in Peninsular Malaysia which is hoped to contribute towards understanding the dynamics of the mangrove ecosystem. Little research has been done on local spiders and inventory from this habitat is rare. From faunal samples taken along transects from upper to lower zones of Morib mangrove forest and studies on available museum specimens in the Raffles Museum of Biodiversity Research (RMBR), yielded 26 species belonging to 10 family groups. There exist 4 species as new records for Malaysia which are Clubiona meraukensis, Dolomedes mizhoanus, Pardosa zhanjiangensis and Telamonia dimidiata. The jumpers or family Salticidae has an overall wide distribution across all zones sampled. Generally, the spider distribution depended on the zone location and floral diversity. Spider zonation pattern is probably influenced by complex factor combinations rather than one factor which include biotic relationships such as competition and predation.
  Y. Norma-Rashid , N.A. Rahman and D. Li
  .
  X.M. Song , S.S. Lu , M. Wang , Q.Y. Li , D. Li , X.G. Yang , Y.Q. Lu , M. Zhang and K.H. Lu
  This study evaluated the effects of Glutathione (GSH) supplemented in the semen extender during the buffalo sperm sorting process on sperm quality, embryonic development after IVF and pregnancy rate after AI. The percentage of sperm motility, plasma membrane integrity and DNA fragmentation were detected by flow cytometry or by microscopy in stained, sorted and frozen semen treated with or without 0.75 mM GSH during the flow sorting procedure. The cleavage and blastocyst rates were examined at day 2 and 6-8 after IVF with frozen semen treated with or without 0.75 mM GSH. Pregnancy diagnosis was determined by transrectal palpation at 90 day after AI with frozen semen treated with or without 0.75 mM GSH. The percentage of sperm with Progressive Motility (MP, %) was significantly higher (p<0.05) in sorted semen supplemented with 0.75 mM GSH than that in the control. The percentages of moribund, dead and Phosphatidylserine (PS) translocated sperm detected by flow cytometry were significantly decreased (p<0.05) in frozen semen supplemented with GSH compared to the control. Higher blastocyst and pregnancy rates (p<0.05) were found after IVF and AI with frozen sperm treated with 0.75 mM GSH than that in the control group. In conclusion, addition of 0.75 mM GSH to the semen extenders (stained, sorted and frozen) during the sperm sorting process can improve sperm quality in vitro embryonic development and in vivo fertility after AI thus indicating potential for commercial application in buffalo sperm sorting.
  D. Li , J. Ma , S. Mukherjee , G. Bi , F. Zhao , S.L. Elizondo and Z. Shi
  The continual improvement of IV–VI materials grown by molecular beam epitaxy (MBE) is a key step in the development of IV–VI infrared semiconductor devices on silicon substrates. This study presents a novel surface-treatment method which is carried out during MBE growth of monocrystalline PbSe on Si(1 1 1)-oriented substrates. Details of the experimental procedures are described and supported by reflection high-energy electron diffraction (RHEED) patterns. The effect of the in-situ surface-treatment method is exhibited in the forms of improved electrical and morphological properties of PbSe thin films. Specially, the carrier mobility increases almost three-fold at 77 K and nearly two-fold at 300 K. The density of the growth pits undergoes almost three-fold reduction, whereas the density of the threading dislocations decreases around four-fold.
  E. J Tan and D. Li
  Eunice J. Tan and Daiqin Li

Many species of the orb-web spider genus Cyclosa often adorn their webs with decorations of prey remains, egg sacs and/or plant detritus, termed `detritus decorations'. These detritus decorations have been hypothesised to camouflage the spider from predators or prey and thus reduce predation risk or increase foraging success. In the present study, we tested these two alternative hypotheses simultaneously using two types of detritus decorations (prey remain and egg sac) built by Cyclosa mulmeinensis (Thorell). By monitoring the possible responses of predators to spiders on their webs with and without decorations in the field, we tested whether web decorations would reduce the mortality of spiders. Wasp predators were observed to fly in the vicinity of webs with decorations slightly more often than in the vicinity of webs without decorations but there were very few attacks on spiders by wasps. By comparing the insect interception rates of webs with and without decorations in the field, we tested whether web decorations would increase the foraging success....

 
 
 
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