Optically active single-walled carbon nanotubes

The optical, electrical and mechanical properties of single-walled carbon nanotubes (SWNTs) are largely determined by their structures, and bulk availability of uniform materials is vital for extending their technological applications1. Since they were first prepared2, 3, much effort has been directed toward selective synthesis and separation of SWNTs with specific structures. As-prepared samples of chiral SWNTs contain equal amounts of left- and right-handed helical structures4, but little attention has been paid to the separation of these non-superimposable mirror image forms, known as optical isomers. Here, we show that optically active SWNT samples can be obtained by preferentially extracting either right- or left-handed SWNTs from a commercial sample. Chiral ‘gable-type’ diporphyrin molecules bind with different affinities to the left- and right-handed helical nanotube isomers to form complexes with unequal stabilities that can be readily separated. Significantly, the diporphyrins can be liberated from the complexes afterwards, to provide optically enriched SWNTs

A rosette cooling cell: More effective container for solubilization of single-walled carbon nanotubes under probe-type ultrasonic irradiation

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The effect of position and length of alkyl substituents in pyridinium based ionic liquids on temperature dependent transport properties

The effect of position and length of alkyl substituent in pyridinium based ionic liqs. (IL) has been studied at various temps. The IL investigated contained the bis(trifluoromethanesulfonyl)imide (NTf2) anion combined with 1-alkyl-3,5-dimethylpyridinium or 1-alkyl-2,3-dimethylmpyridinium cations, resp. Data for the cond. 0-80 °C, the viscosity 10-70 °C, d. 0-80 °C and thermal expansion coeffs. 0-80°C of the ionic liqs. [B23MMPYR][NTf2], [B35MMPYR][NTf2], [O23MMPYR][NTf2], [O35MMPYR][NTf2] are reported. The viscosity and cond. data obtained could be well described with the empirical Vogel-Fulcher-Tammann equation. Based on the molar conductivities and viscosities measured from 10 to 70 °C, a significant influence of the position of the Me substituents in the cation on the transport properties has been found. Walden plots of these data demonstrate that the investigated compd. can be classified as high ionicity ionic liqs. IL contg. 1-alkyl-2,3-dimethylpyrindium cations were found to be closer to the "ideal" KCl line suggesting less ion assocn. compared to their 1-butyl-3,5-dimethylpyridinium homologues

Data from: Incidence of cancer-associated thromboembolism in Japanese gastric and colorectal cancer patients receiving chemotherapy: a single-institutional retrospective cohort analysis (Sapporo CAT study)

Objective: Few data regarding the incidence of cancer-associated thromboembolism (TE) are available for Asian populations. We investigated the incidence of TE (TEi) and its risk factors among gastric and colorectal cancer (GCC) patients who received chemotherapy in a daily practice setting. Design: A retrospective cohort study. Setting: A single institutional study that used data from Sapporo City General Hospital, Japan, on patients treated between January 2008 and May 2015. Participants: Five hundred Japanese GCC patients who started chemotherapy from January 2008 to May 2015. Primary and secondary outcome measures: TE was diagnosed by reviewing all the reports of contrast-enhanced computed tomography (CT) performed during the follow-up period. All types of thrombosis detected by CT or additional imaging tests, such as venous TE, arterial TE, and cerebral infarction, were defined as TE. Medical records of all identified patients were reviewed and potential risk factors for TE including clinicopathological backgrounds were collected. We defined the following patients as ‘active cancer’; patients with unresectable advanced GCC, cancer recurrence during or after completing adjuvant (Adj) chemotherapy, and/or presence of other malignant tumours. Results: Of the 500 patients, 70 patients (14.0%) developed TE during the follow-up period. TEi was 9.2% and 17.3% in gastric and colorectal cancer patients, 18.1% and 3.5% in active and non-active cancer patients, and 24.0% and 12.9% in multiple and single primary, respectively. Multivariate logistic regression analysis showed that colorectal cancer (odds ratio [OR], 2.371; 95% confidence interval [CI], 1.328 to 4.233), active cancer (OR 7.593; 95% CI 2.950 to 19.543), and multiple primary (OR 2.527; 95% CI 1.189 to 5.370) were independently associated with TEi. Conclusion: TEi was 14.0% among Japanese GCC patients received chemotherapy, and was significantly higher among patients with colorectal cancer, active cancer, and multiple primary than among those with gastric cancer, non-active cancer, and single primary, respectively

Sapporo CAT study

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Incidence of cancer-associated thromboembolism in Japanese gastric and colorectal cancer patients receiving chemotherapy : a single-institutional retrospective cohort analysis (Sapporo CAT study)

Objective Few data regarding the incidence of cancer-associated thromboembolism (TE) are available for Asian populations. We investigated the incidence of TE (TEi) and its risk factors among gastric and colorectal cancer (GCC) patients received chemotherapy in a daily practice setting. Design A retrospective cohort study. Setting A single-institutional study that used data from Sapporo City General Hospital, Japan, on patients treated between January 2008 and May 2015. Participants Five hundred Japanese GCC patients who started chemotherapy from January 2008 to May 2015. Primary and secondary outcome measures TE was diagnosed by reviewing all the reports of contrast-enhanced CT performed during the follow-up period. All types of thrombosis detected by CT or additional imaging tests, such as venous TE, arterial TE and cerebral infarction, were defined as TE. Medical records of all identified patients were reviewed and potential risk factors for TE, including clinicopathological backgrounds, were collected. We defined the following patients as 'active cancer'; patients with unresectable advanced GCC, cancer recurrence during or after completing adjuvant chemotherapy and/or presence of other malignant tumours. Results Of the 500 patients, 70 patients (14.0%) developed TE during the follow-up period. TEi was 9.2% and 17.3% in GCC patients, 18.1% and 3.5% in active and non-active cancer patients, and 24.0% and 12.9% in multiple and single primary, respectively. Multivariate logistic regression analysis showed that colorectal cancer (CRC) (OR 2.371; 95% CI 1.328 to 4.233), active cancer (OR 7.593; 95%CI 2.950 to 19.543) and multiple primary (OR 2.527; 95%CI 1.189 to 5.370) were independently associated with TEi. Conclusion TEi was 14.0% among Japanese GCC patients received chemotherapy, and was significantly higher among patients with CRC, active cancer and multiple primary than among those with gastric cancer, non-active cancer and single primary, respectively. Trial registration number UMIN000018912