Rational Design of Asymmetric Polymethines to Attain NIR(II) Bioimaging at >1100 nm.

Organic molecules having emission in the NIR(II) region are emergent and receiving enormous attention. Unfortunately, attaining accountable organic emission intensity around the NIR(II) region is hampered by the dominant internal conversion operated by the energy gap law, where the emission energy gap and the associated internal reorganization energy λint play key roles. Up to the current stage, the majority of the reported organic NIR(II) emitters belong to those polymethines terminated by two symmetric chromophores. Such a design has proved to have a small λint that greatly suppresses the internal conversion. However, the imposition of symmetric chromophores is stringent, limiting further development of organic NIR(II) dyes in diversity and versatility. Here, we propose a new concept where as far as the emissive state of the any asymmetric polymethines contains more or less equally transition density between two terminated chromophores, λint can be as small as that of the symmetric polymethines. To prove the concept, we synthesize a series of new polymethines terminated by xanthen-9-yl-benzoic acid and 2,4-diphenylthiopyrylium derivatives, yielding AJBF1112 and AEBF1119 that reveal emission peak wavelength at 1112 and 1119 nm, respectively. The quantum yield is higher than all synthesized symmetric polymethines of 2,4-diphenylthiopyrylium derivatives (SC1162, 1182, 1185, and 1230) in this study. λint were calculated to be as small as 6.2 and 7.3 kcal/mol for AJBF1112 and AEBF1119, respectively, proving the concept. AEBF1119 was further prepared as a polymer dot to demonstrate its in vitro specific cellular imaging and in vivo tumor/bone targeting in the NIR(II) region.

[The study of the relationship between interleukin gene polymorphism and the morbidity of patients with acute pancreatitis].

OBJECTIVE: To explore interleukin-1 beta (IL-1 beta) and IL-6 gene polymorphism, and investigate the relationship between their gene polymorphism and the morbid state of patients with acute pancreatitis (AP). METHODS: The polymorphism of IL-1 beta gene 511C/T and IL-6 gene 634C/G site was analyzed by polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP) in patients (74 patients) with AP, including mild acute pancreatitis (MAP, 36 patients) and severe acute pancreatitis (SAP, 38 patients), and also a group of normal control (78 patients). The plasma concentrations of IL-1 beta and IL-6 were measured by enzyme linked immunosorbent assay (ELISA). The patients with SAP were divided into groups on the basis of different genotypes, and the clinical data were compared among different groups. RESULTS: The plasma levels of IL-1 beta and IL-6 in patients with AP were significantly higher than normal control group [IL-1 beta: (13.16+/-2.82) ng/L vs. (6.21+/-1.57) ng/L; IL-6: (84.86+/-32.92) ng/L vs. (9.95+/-2.49) ng/L, both P<0.05]. There was no statistical significance between IL-1 beta gene 511 site and IL-6 gene 634 site genotype or allele frequency between the patients with AP and the normal control. In patients with SAP, IL-1 beta gene 511 site T/T genotype and T allele frequency were significantly higher than that of MAP group (both P<0.05). There was no statistically significant difference in plasma levels of IL-1 beta between C/C group and C/T+T/T group, and the plasma levels of IL-6 in patients with IL-6 gene 634 site C/G were significantly higher than C/C group [(97.23+/-35.49) ng/L vs. (72.14+/-24.55) ng/L, P<0.05]. In patients with SAP, the scores of clinical evaluation in IL-1 beta gene 511 site C/T+T/T group and IL-6 gene 634 site C/G group were significantly higher than that in IL-1 beta gene 511 site C/C group and IL-6 gene 634 site C/C group (all P<0.05). CONCLUSION: IL-1 beta gene 511 site C/T and IL-6 gene 634 site C/G polymorphism may be genetic susceptibility factors for exacerbation of AP.

[Flame atomic absorption spectrophotometry for measurement of iron, manganese and zinc contents of wheat seeds].

The iron, manganese and zinc trace element contents of six different kinds of winter wheat seeds were studied by flame atomic absorption spectrophotometry. As a result, the rates of recovery of iron, manganese and zinc are 103.09%, 102.90% and 101.19%, respectively, and the relative standard deviations (RSDs) of Fe, Mn and Zn are smaller than 3.94%, 1.67% and 2.69%, respectively. Taking GBW08503 wheat flour as standard sample and carrying out comparative determination, the successful results were achieved. This method is very simple, rapid and accurate.

[Feasibility of lymphadenectomy with skeletonization in extended right hemicolectomy by hand-assisted laparoscopic surgery].

OBJECTIVE: To investigate the feasibility of lymphadenectomy with skeletonization in extended right hemicolectomy by hand-assisted laparoscopic surgery (HALS). METHODS: From November 2001 to September 2004, 30 cases with right hemicolonic cancer were divided into two groups, and received laparoscopic or open extended right hemicolectomy plus lymphadenectomy with skeletonization. Clinical data of two groups were compared. RESULTS: The mean operative time were (214.0 +/- 16.5) min and (245.0 +/- 24.6) min (t=2.248, P< 0.05), the mean volumes of intraoperative bleeding (78.4 +/- 24.3) ml and (203.3 +/- 48.5) ml (t=4.927, P< 0.05), the mean time of anal aerofluxus (53.4 +/- 6.7) h and (67.3 +/- 9.7) h (t=2.530, P< 0.05), the mean postoperative hospital stay (11.5 +/- 1.11) d and (17.9 +/- 3.98) d (t=3.413, P< 0.05) respectively in laparoscopic and open operation groups. The mean numbers of N1, N2 and N3 lymph nodes cleared in laparoscopic group were (15.3 +/- 2.6), (5.6 +/- 1.6) and (4.3 +/- 2.2) respectively,while (16.2 +/- 3.3), (5.9 +/- 2.2) and (6.1 +/- 1.5) respectively in open operation group (all P > 0.05). The complication rates were 20.0% (3/15) and 33.3% (5/15) respectively in laparoscopic and open operation groups (chi(2)=0.0227, P > 0.05). CONCLUSION: Extended right hemicolectomy plus lymphadenectomy with skeletonization can be perfectly performed by HALS.