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Articles by C. Li
Total Records ( 5 ) for C. Li
  P Chen , J Vaughan , C Donaldson , W Vale and C. Li

Urocortin 3 (Ucn 3) is a corticotropin-releasing factor (CRF)-related peptide with high affinity for the type 2 CRF receptor (CRFR2). Central administration of Ucn 3 stimulates the hypothalamic-pituitary-adrenal axis, suppresses feeding, and elevates blood glucose levels, suggesting that activation of brain CRFR2 promotes stress-like responses. Several CRFR2-expressing brain areas, including the ventromedial hypothalamus (VMH) and the posterior amygdala (PA), may be potential sites mediating the effects of Ucn 3. In the present study, Ucn 3 or vehicle was bilaterally injected into the VMH or PA, and food intake and plasma levels of ACTH, corticosterone, glucose, and insulin were determined. Food intake was greatly reduced in rats following Ucn 3 injection into the VMH. Ucn 3 injection into the VMH rapidly elevated plasma levels of glucose and insulin but did not affect ACTH and corticosterone secretion. Injection of Ucn 3 into the PA did not alter any of the parameters measured. We determined that the majority of CRFR2-positive neurons in the VMH were excitatory glutamatergic, and a subset of these neurons project to the arcuate nucleus of the hypothalamus (ARH). Importantly, stimulation of CRFR2 in the VMH increased proopiomelanocortin mRNA expression in the ARH. In conclusion, the present study demonstrates that CRFR2 in the VMH mediates some of the central effects of Ucn 3, and the ARH melanocortin system may be a downstream target of VMH CRFR2 neurons.

  G. Zhao , E. S. Ford , C. Li and A. H. Mokdad
  Aims  To investigate whether US adults with diabetes meet both the national and American Diabetes Association (ADA) recommendations for physical activity compared with people without diabetes, and to examine the trends of this behaviour over time.

Methods  We analysed data from large nationally representative cohorts from the 1996-2005 Behavioral Risk Factor Surveillance System. The number of participants ranged from 98 127 in 1996 to 204 977 in 2005, and the number of people with diabetes ranged from 4379 in 1996 to 13 608 in 2005. Participants were classified by their exercise status and physical activity levels. The age-standardized prevalence of physical activity participation or meeting physical activity recommendations was calculated in people with and without diabetes.

Results  People with diabetes participated less in physical activity (63.1-68.9 vs. 71.7-78.3%) and met physical activity recommendations less than people without diabetes (40.2-42.9 vs. 48.0-51.5% for meeting national recommendations and 38.5-41.7 vs. 46.6-49.8% for meeting ADA recommendations). The percentage of people with diabetes who participated in physical activity in the past 10 years or met physical activity recommendations in the past 5 years did not vary, whereas significantly increasing trends were observed in people without diabetes. The odds for adults with diabetes meeting physical activity recommendations were significantly lower than in adults without diabetes even after multivariate adjustment.

Conclusion  People with diabetes were less likely to meet either national or ADA recommendations for physical activity than people without diabetes. Our results demonstrate the need for more efforts from health-care professionals to promote physical activity in people with diabetes.

  C. Li , L. Barker , E. S. Ford , X. Zhang , T. W. Strine and A. H. Mokdad
  Aims  Anxiety disorders may cause substantial impairment in patient functioning and well-being. Little is known about the relationship between diabetes and anxiety. We estimated the prevalence of lifetime diagnosis of anxiety in adults aged ≥ 18 years with and without diabetes in the USA.

Methods  We analysed data from the 2006 Behavioral Risk Factor Surveillance System (total, N = 201 575; 20 142 with diabetes; 39.4% men, 77.9% non-Hispanic Whites, 8.1% non-Hispanic Blacks and 7.7% Hispanics; mean age 52.4 years). Diabetes and lifetime diagnosis of anxiety were self-reported. A multivariable log-binomial model was used to estimate prevalence ratios (PR) and associated 95% confidence intervals (CI) of anxiety based on diabetes status.

Results  The overall age-adjusted prevalence of lifetime diagnosis of anxiety was 19.5 and 10.9% in people with and without diabetes, respectively. After adjustment for educational level, marital status, employment status, current smoking, leisure-time physical activity and body mass index, people with diabetes had a 20% higher prevalence of lifetime diagnosis of anxiety than those without (PR 1.20; 95% CI 1.12, 1.30). There were no significant differences in the PR by gender (P = 0.06). However, the ratios differed significantly by age (P = 0.04) and by race/ethnicity (P < 0.01), indicating that people aged 18−29 years (PR 1.70; 95% CI 1.19, 2.43) and Hispanics (PR 1.69; 95% CI 1.33, 2.15) had a higher ratio than their counterparts.

Conclusion  Diabetes was significantly associated with anxiety in adults in this large population-based sample, particularly in Hispanics and young adults.

  J. Perez , C. Li , C. Horak , E. Pawlak , A. Docters and E. Kairiyama
  Argentina produces 1.8 million tons/year of apples (Malus domestica L.) and pears (Pyrus communis L.) in the Patagonia region. Cydia pomonella, codling moth, and Grapholita molesta, Oriental fruit moth, (Lepidoptera: Tortricidae) are quarantine pests in pome fruits. Irradiation is a promising phytosanitary treatment because a dose of 200 Gy completely prevents pest adult emergence. A pilot irradiation process of commercially packaged ‘Red Delicious’ apples and ‘Packham's Triumph’ pears was performed in an irradiation facility with a Cobalt 60 source. Quality analyses were carried out at 0, 2, 4, 6 and 8 months of storage (1 °C, RH 99%) to evaluate fruit tolerance at 200, 400 and 800 Gy. Irradiation at 200 and 400 Gy had no undesirable effects on fruit quality (pulp firmness, external colour, soluble solids content (SSC), titratable acidity (TA) and sensory evaluations). Irradiation of ‘Red Delicious’ apples and ‘Packham's Triumph’ pears can be applied as a commercial quarantine treatment with a minimum absorbed dose of 200 Gy (to control codling moth and Oriental fruit moth) and <800 Gy (according to quality results).
  Y. Wang , Y. He , H. Zhang , J. Schroder , C. Li and D. Zhou
  Phosphate mobilization by organic acids has been shown to be soil type dependent and controlled by the soil`s intrinsic P status. The objective of this study was to evaluate the capacity and mechanisms of three organic acids in the mobilization of phosphate from an upland clay loam Ultisol that had received different long-term fertilizer treatments. Soil samples were incubated at 25 ± 1°C and 40% moisture content for 3 wk with citric, tartaric, or oxalic acid at 1.0 mmol kg–1 of soil. Soil pH, inorganic P fractions, and plant-available P (Olsen P) were analyzed after incubation. The results indicated that Olsen P and the loosely bound P extracted with 1.0 mol L–1 NH4Cl (NH4Cl-P) were significantly increased by the treatment of the three organic acids, and Fe phosphate (Fe-P), occluded phosphate (Oc-P), and Ca phosphate (Ca-P) were mobilized and released to various degrees as well. The order of increased mobilization of P by the organic acids was citric acid > tartaric acid > oxalic acid. These three organic acids have the potential to increase the availability of P in soil but need to be evaluated at the field scale.
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