Selective formation of carbon-coated, metastable amorphous ZnSnO3 nanocubes containing mesopores for use as high-capacity lithium-ion battery.

Mesoporous and amorphous ZnSnO3 nanocubes of ~37 nm size coated with a thin porous carbon layer have been prepared using monodisperse ZnSn(OH)6 as the active precursor and low-temperature synthesized polydopamine as the carbon precursor. The small single nanocubes cross-link with each other to form a continuous conductive framework and interconnected porous channels with macropores of 74 nm width. Because of its multi-featured nanostructure, this material exhibits greatly enhanced integration of reversible alloying/de-alloying (i.e., transformation of Li(4.4)Sn and LiZn to Sn and Zn) and conversion (i.e., oxidation of Sn and Zn to ZnSnO3) reaction processes with an extremely high capacity of 1060 mA h g(-1) for up to 100 cycles. A high reversible capacity of 650 and 380 mA h g(-1) can also be delivered at rates of 2 and 3 A g(-1), respectively. This excellent electrochemical performance is attributed to the small particle size, well-developed mesoporosity, the amorphous nature of the ZnSnO3 and the continuous conductive framework produced by the interconnected carbon layers.

Longitudinal Analysis of One-Carbon Metabolism-Related Metabolites in Maternal and Cord Blood of Japanese Pregnant Women.

One-carbon metabolism (OCM) is a complex and interconnected network that undergoes drastic changes during pregnancy. In this study, we investigated the longitudinal distribution of OCM-related metabolites in maternal and cord blood and explored their relationships. Additionally, we conducted cross-sectional analyses to examine the interrelationships among these metabolites. This study included 146 healthy pregnant women who participated in the Chiba Study of Mother and Child Health. Maternal blood samples were collected during early pregnancy, late pregnancy, and delivery, along with cord blood samples. We analyzed 18 OCM-related metabolites in serum using stable isotope dilution liquid chromatography/tandem mass spectrometry. We found that serum S-adenosylmethionine (SAM) concentrations in maternal blood remained stable throughout pregnancy. Conversely, S-adenosylhomocysteine (SAH) concentrations increased, and the total homocysteine/total cysteine ratio significantly increased with advancing gestational age. The betaine/dimethylglycine ratio was negatively correlated with total homocysteine in maternal blood for all sampling periods, and this correlation strengthened with advances in gestational age. Most OCM-related metabolites measured in this study showed significant positive correlations between maternal blood at delivery and cord blood. These findings suggest that maternal OCM status may impact fetal development and indicate the need for comprehensive and longitudinal evaluations of OCM during pregnancy.

Association of Fatty Acid Desaturase 1 rs174547 Polymorphism with the Composition of Long-Chain Polyunsaturated Fatty Acids in Serum Glycerophospholipids during Pregnancy.

The increase in fetal requirements of long-chain polyunsaturated fatty acids (LCPUFAs) during pregnancy alters maternal fatty acid metabolism, and therefore, fatty acid desaturase (FADS) gene polymorphisms may change blood fatty acid composition or concentration differently during pregnancy. We investigated the relationship between a FADS1 single-nucleotide polymorphism (SNP) and maternal serum LCPUFA levels in Japanese pregnant women during the first and third trimesters and at delivery. Two hundred and fifty-three pregnant women were included, and fatty acid compositions of glycerophospholipids in serum (weight %) and the FADS1 SNP rs174547 (T/C) were analyzed. LCPUFAs, including arachidonic acid (ARA) and docosahexaenoic acid (DHA), significantly decreased from the first to the third trimester of pregnancy. Furthermore, DHA significantly decreased from the third trimester of pregnancy to delivery. At all gestational stages, linoleic acid (LA) and α-linolenic acid were significantly higher with the number of minor FADS1 SNP alleles, whereas γ-linolenic acid and ARA and the ARA/LA ratio were significantly lower. DHA was significantly lower with the number of minor FADS1 SNP alleles only in the third trimester and at delivery, suggesting that genotype effects become more obvious as pregnancy progresses.

Mouse model of metformin-induced diarrhea.

OBJECTIVE: Metformin, an oral medication used for type 2 diabetes mellitus, is the most commonly prescribed drug with less economic burden of patients. Although metformin's efficacy and safety have long been recognized, approximately 5% of the patients treated with this drug develop severe diarrhea as an adverse effect and have to abandon treatment. Because there is no animal model to study metformin-induced diarrhea, it is hard to develop methods to maintain quality of life of patients prescribed with metformin. RESEARCH DESIGN AND METHODS: Using mouse models, we tried to develop an evaluation system for metformin-induced diarrhea to improve diarrheal symptoms in patients with diabetes. Healthy (C57BL/6J) and diabetic obese (db/db) mice were subjected to a stepwise dose escalation of metformin (250 mg/kg/day (125 mg/kg twice daily oral dose)-1000 mg/kg/day (500 mg/kg twice daily oral dose)), and fecal moisture contents and their score were monitored. To evaluate anti-diarrheal medications, wood creosote (a traditional medicine) was tested. Several groups of enterobacteria in fresh feces were examined by using PCR. RESULTS: 1000 mg/kg/day (four times maximal effective dose) of metformin significantly increased fecal moisture content. Although no symptoms of diarrhea were observed in healthy C57BL/6J mice, the same dose of metformin induced severe diarrhea in diabetic obese db/db mice. A reduction in PCR signals for the Firmicutes group was associated with metformin-induced diarrhea. Wood creosote reduced diarrhea (high water-content) without affecting metformin's efficacy or enterobacterial flora levels. CONCLUSIONS: We have created the first animal model of metformin-induced diarrhea using db/db mice, which will provide better quality of life for patients suffering from diarrhea caused by metformin.

Distribution of 5-Methyltetrahydrofolate and Folic Acid Levels in Maternal and Cord Blood Serum: Longitudinal Evaluation of Japanese Pregnant Women.

"Total" folate in blood has usually been measured to evaluate the folate status of pregnant women. However, folate is composed of many metabolites. The main substrate is 5-methyltetrahydrofolate (5-MTHF), with folic acid (FA) representing a very small component as an unmetabolized species in blood. We longitudinally evaluated 5-MTHF, FA and total homocysteine in maternal and cord blood from Japanese pregnant women. Subjects were 146 pregnant women who participated in the Chiba study of Mother and Child Health (C-MACH) prospective cohort study. Sera were obtained in early and late pregnancy, at delivery, and from cord blood. Species levels were measured by isotope-dilution mass spectrometry. Both 5-MTHF and FA levels were lower than reported levels from pregnant women in populations from countries with mandatory FA fortification. As gestational age progressed, serum 5-MTHF levels decreased, whereas serum FA levels were slightly reduced only at delivery compared to early pregnancy. A significant negative association between serum 5-MTHF and total homocysteine was shown at all examined times, but no associations with FA were evident. At delivery, cord 5-MTHF was significantly higher than maternal levels, while FA again showed no significant correlation. These results suggest that 5-MTHF is actively transported to the fetus through placental transporters and may reflect folate status during pregnancy as a physiologically important species.

Effect of hypoxic-ischemic injury on serine palmitoyltransferase activity in the developing rat brain.

BACKGROUND: Sphingolipid metabolism is strongly associated with central nervous system myelination. Ceramide is the most active of the sphingolipid metabolites. On the basis of ceramide biosynthesis indicated by serine palmitoyltransferase activity and cerebroside generated by ceramide, the evaluation of serine palmitoyltransferase activity in developing brains or hypoxic-ischemic damaged brains is worthwhile. METHODS: Using a scintillation counter, we assessed serine palmitoyltransferase activity, a rate-limiting enzyme of sphingolipid metabolism, in the brains of developing rats and compared the activity with hypoxic-ischemic brains, using the method of Rice on postnatal day 7 (P7). RESULTS: In the control groups, serine palmitoyltransferase activity was detected in the microsomal fraction of whole brain homogenates from P4, which was earlier than the initial expression of myelin-specific proteins such as myelin basic protein and proteolipid protein on immunochemistry. Serine palmitoyltransferase activity increased along with development on P8, P10, P14 and P21. However, hypoxic-ischemic brains showed lower serine palmitoyltransferase activity than control brains on P8, P10, P14 and P21. CONCLUSIONS: These results suggest that increase in serine palmitoyltransferase activity before myelin-specific protein expression may be an initial step in myelinogenesis and a decline in serine palmitoyltransferase activity in hypoxic-ischemic brains may be one of the major causes of delayed myelination.

Effect of dietary Lorenzo's oil and docosahexaenoic acid treatment for Zellweger syndrome.

We investigated the possible therapeutic effect of decreasing plasma levels of very-long-chain fatty acids (C26:0) with a synthetic oil containing trioleate and trielucate (Lorenzo's oil) as well as increasing docosahexaenoic acid (DHA) in red blood cells (RBC) with DHA ethyl ester in four patients with Zellweger syndrome. We investigated serial changes of plasma C26:0 levels and DHA levels in RBC membranes by gas-liquid chromatography/mass spectrometry (GC/MS). After death, the fatty acid composition of each patient's cerebrum and liver was studied. Dietary administration of Lorenzo's oil diminished plasma C26:0 levels. Earlier administration of Lorenzo's oil was more effective and the response did not depend on the duration of administration. DHA was incorporated into RBC membrane lipids when administrated orally, and its level increased for several months. The final DHA level was correlated with the duration of administration and was not related to the timing of initiation of treatment. DHA levels in the brains and livers of treated patients were higher than in untreated patients. Early initiation of Lorenzo's oil and the long-term administration of DHA may be useful for patients with Zellweger syndrome.

Early dietary treatments with Lorenzo's oil and docosahexaenoic acid for neurological development in a case with Zellweger syndrome.

We treated a girl with Zellweger syndrome using a special infant formula supplemented with middle chain triglyceride (MCT) milk, docosahexaenoic acid (DHA), Lorenzo's oil, and Lunaria oil, which is rich in nervonic acid (C24:1). We examined the fatty acid contents of the plasma and red blood cell (RBC) membrane. Neurological development was evaluated using Denver developmental screening test and auditory brainstem response (ABR). Her delayed neurological development, liver dysfunction, and cholestasis were all improved 2 weeks after starting the dietary treatment. DHA level in RBC membranes was increased and very long chain fatty acid (VLCFA,C26:0) levels were decreased. Our findings suggest that the dietary treatment with combination of MCT milk, DHA, Lorenzo's oil, and Lunaria oil in the patients with Zellweger syndrome bring some benefits for neurological development.

High hexacosanoic acid levels are associated with coronary artery disease.

AIMS: Levels of saturated very long chain fatty acids (VLCFAs) are associated with coronary risk factors, including metabolic syndrome (MS), atherogenic lipoproteins, and systemic inflammation. However, the relationship between circulating levels of saturated VLCFA and coronary artery disease (CAD) remains unclear. METHOD: We enrolled 100 consecutive CAD patients and 40 age-, gender-, and body mass index (BMI)-matched healthy control subjects. The levels of hexacosanoic acid (C26:0), a VLCFA, in whole blood were measured by gas-liquid chromatography mass spectrometry. RESULTS: C26:0 levels were significantly higher in the CAD group than in the control group (2.42±0.32 vs. 2.27±0.24 µg/ml, P=0.01) and positively correlated with BMI (r=0.23, P=0.008), triglyceride levels (r=0.22, P=0.01), and hypertension (P=0.01). CAD patients with MS showed the highest C26:0 levels adjusted by hematocrit. Furthermore, adjusted C26:0 levels in CAD patients without MS were higher than those in controls (P=0.02), suggesting that C26:0 levels increased with the presence of CAD independent of MS. Our multivariate analysis revealed that high C26:0 levels in whole blood is an independent marker for CAD even after adjustment for age, gender, BMI, lipid profiles, fasting plasma glucose, and blood pressure. CONCLUSION: High C26:0 levels in whole blood may be an independent marker for identifying the risks of CAD.

High levels of very long-chain saturated fatty acid in erythrocytes correlates with atherogenic lipoprotein profiles in subjects with metabolic syndrome.

AIM: Very long chain saturated fatty acid (VLCFA) levels in erythrocytes are associated with metabolic syndrome (MS). However, the relationship between levels of the VLCFA ligonoceric acid (C24:0) in erythrocytes and the atherogenic lipoprotein profiles and inflammatory state in MS remain unclear. METHODS: Based on the International Diabetes Federation (IDF) definition of MS, 195 apparently healthy males were assigned to either an MS group (n=38) or a non-MS group (n=157). Fatty acid composition of erythrocytes was determined by gas liquid chromatography. RESULTS: Erythrocytes from the MS group had a significantly higher level of C24:0 than cells from the non-MS group (4.06±0.48% versus 3.88±0.34%; p=0.03). C24:0 levels were significantly correlated with several components of MS. The C24:0 levels showed a significant negative correlation with LDL and HDL particle size. Multivariate linear regression analysis showed that C24:0 levels were independently correlated with LDL particle size after adjusting for age and each MS criterion. C24:0 levels were also positively correlated with log-transformed high-sensitivity CRP levels (p=0.04). CONCLUSION: C24:0 levels in erythrocytes are associated with specific atherogenic lipoprotein profiles and inflammation status in subjects with MS.

Dramatic change of water-cluster accessibility of highly pure double-walled carbon nanotubes with high temperature annealing.

Highly pure double-walled carbon nanotubes (DWCNTs) synthesized by a catalytic chemical vapour deposition method have a well-ordered bundle structure giving explicit diffraction peaks by synchrotron X-ray diffraction measurement. The changes of nanopore structural properties and water adsorptivity of DWCNTs with high-temperature heat treatment were investigated using molecular probe adsorption methods. It was founded that their nanoporosities and apparent hydrophilicities decreased with thermal annealing. However, a specific surface area of 275 m(2) g(-1) and the residual microporosity of more than 60% even after heat treatment at 2673 K suggest their unique applications.

Chirality-dependent transport in double-walled carbon nanotube assemblies: the role of inner tubes.

A fundamental understanding of the electrical properties of carbon nanotubes is vital when fabricating high-performance polymeric composites as well as transparent conductive films. Herein, the chirality-dependent transport mechanisms in peapod- and chemical vapor deposition-grown double-walled carbon nanotubes (DWNTs) films are discussed by identifying the chiralities of the inner and the outer tubes using fast Fourier transform image processing, as well as optical studies (e.g., Raman, UV, and photoluminescence spectroscopies). The observed conduction mechanisms are strongly dependent on the total fraction of the metallic inner and outer tubes within the DWNT samples. Furthermore, the contribution of the inner tubes to the electronic transport properties of DWNT films is confirmed by photochemically deactivating the outer tubes in both types of DWNT samples.

ω-3 fatty acids attenuate mucosal inflammation in premature rat pups.

BACKGROUND: Necrotizing enterocolitis (NEC) is a devastating intestinal disease of premature infants. Although ω-3 fatty acids are known to have antiinflammatory effects, their effect against NEC remains unclear. METHODS: Mother rats fed a soybean-based, docosahexaenoic acid (DHA)- or eicosapentaenoic acid (EPA)-enriched diet from days 7 to 20 of gestation were examined. On day 20, the rat pups were delivered by abdominal incision, their intestines were removed, and messenger RNA was extracted. A rat NEC model was used to confirm the effects of ω-3 fatty acids on the inflamed intestine (n = 20-28). The expression of inflammatory molecules was analyzed by real-time polymerase chain reaction (n = 11-14). RESULTS: The concentrations of DHA and EPA in the intestine were significantly increased in the DHA and EPA groups (P < .01). The expression of the antiinflammatory prostaglandin E2 receptor EP3 was increased in the DHA (P < .05) and EPA groups (P < .01). In the NEC model, the reduced incidence of colitis was confirmed in the DHA and EPA groups. The expression of peroxisome proliferator-activated receptor γ was increased (P < .05), and the inhibitor of nuclear factor-κB α/ß decreased in both the DHA (P < .01) and EPA groups (P < .05). CONCLUSION: Our findings indicate that ω-3 fatty acids are beneficial for protecting the premature intestine from inflammation by regulating eicosanoid- and nuclear factor-κB-related metabolite expression.

High levels of saturated very long-chain fatty acid (hexacosanoic acid; C26:0) in whole blood are associated with metabolic syndrome in Japanese men.

OBJECTIVE: Hexacosanoic acid (C26:0) is a saturated very long-chain fatty acid and high levels of C26:0 in red blood cells are reported to be closely related with risk factors of atherosclerosis. However, the relationship between absolute levels of C26:0 in whole blood and metabolic syndrome (MS) has not been determined. MATERIALS AND METHOD: We divided 218 consecutive apparently healthy male subjects into an MS group (n=78) and a non-MS group (n=140) according to the definition of the International Diabetes Federation. The levels of C26:0 in whole blood were measured by gas liquid chromatography-mass spectrometry. RESULTS: The MS group had significantly higher levels of C26:0 than the non-MS group (2.42+/-0.31mug/ml vs. 2.25+/-0.29mug/ml, P=0001). There was a significant association between the levels of C26:0 and the number of factors of MS. The levels of C26:0 positively correlated with age, blood pressure, triglyceride and fasting plasma glucose. Multivariate analysis revealed that the level of C26:0 is still an independent variable for the presence of MS after adjustment for age and each criterion of MS. CONCLUSION: The absolute levels of C26:0 in whole blood appear to be associated with MS independent of its component parts.

Comparison of the phospholipid classes in human milk in Japanese mothers of term and preterm infants.

BACKGROUND: Phospholipids (PLs) play an essential role in the growth and brain development of infants. AIM: To investigate PL composition in human milk (HM), including lysophosphatidylcholine, phosphatidylethanolamine, phosphatidylinositol, phosphatidylserine, phosphatidylcholine (PC) and sphingomyelin (SM), from healthy Japanese mothers. Analyses were performed on colostrum, transitional milk and mature milk from mothers of preterm and term infants. METHODS: HM samples were collected from mothers of 15 term infants (term group) and of 19 preterm infants (preterm group). PL composition was determined by two-dimensional thin-layer chromatography in conjunction with phosphorus analysis. RESULTS: In both groups, the PL content (% of total lipid) of mature milk was significantly lower than in colostrum. SM and PC were the main PLs in HM, but in the preterm group, the percentage of SM in mature milk was significantly higher and PC in mature milk was significantly lower than in the term group. CONCLUSION: The transition from colostrum to mature milk leads to an increase in SM and a decrease in PC in the HM of preterm infants, along with a decrease in PL content. This is the first report to demonstrate the differences in PL composition in HM between mothers of preterm and term infants.

Effects of dietary sphingomyelin on central nervous system myelination in developing rats.

Human milk contains sphingomyelin (SM) as a major component of the phospholipid fraction. Galactosylceramide (cerebroside), a metabolite of sphingolipids, increases along with CNS myelination, and is generally considered a universal marker of myelination in all vertebrates. l-Cycloserine (LCS) is an inhibitor of serine palmitoyltransferase (SPT), a rate-limiting enzyme for sphingolipid biosynthesis that is reported to show increased activity with development of the rat CNS. The present study examined the effects of dietary SM on CNS myelination during development in LCS-treated rats. From 8 d after birth, Wistar rat pups received a daily s.c. injection (100 mg/kg) of LCS. From 17 d after birth, the animals were fed an 810 mg/100g of bovine SM-supplemented diet (SM-LCS group) or a nonsupplemented diet (LCS group). At 28 d after birth, the animals were killed and subjected to biochemical and morphometric analyses. The myelin dry weight, myelin total lipid content, and cerebroside content were significantly lower in the SM-LCS and LCS groups than in a group not treated with LCS (the non-LCS group). However, these levels were significantly higher in the SM-LCS group than in the LCS group. Morphometric analysis of the optic nerve revealed that the axon diameter, nerve fiber diameter, myelin thickness, and g value (used to compare the relative thickness of myelin sheaths around fibers of different diameter) were significantly lower in the LCS group than in the other groups, but were similar in the SM-LCS and non-LCS groups. These findings suggest that dietary SM contributes to CNS myelination in developing rats with experimental inhibition of SPT activity corrected].