Irritable bowel syndrome(IBS)is a common chronic functional gastrointestinal disorder affecting 10%-22%of adults.Its development is closely related to the gut microbiota,and the inflammatory and immune responses trigg...Irritable bowel syndrome(IBS)is a common chronic functional gastrointestinal disorder affecting 10%-22%of adults.Its development is closely related to the gut microbiota,and the inflammatory and immune responses triggered by the gut microbiota can lead to IBS.Vitamin D(VD)effectively treats IBS with fewer side effects by improving gut microbiota,immune regulation,and anti-inflammatory effects.In the future,it is necessary to carry out epidemiological studies on the relationship between VD and IBS,clinical studies on the efficacy of supplementing VD to improve IBS,and animal studies on the mechanism of VD improving IBS.Therefore,this paper discussed the relationship between VD and IBS.展开更多
The diet structure of diabetic patients is different from that of normal people.Diabetic patients also need to take hypoglycemic drugs to regulate blood sugar.Both dieting and drugs affect the gut microbiota of diabet...The diet structure of diabetic patients is different from that of normal people.Diabetic patients also need to take hypoglycemic drugs to regulate blood sugar.Both dieting and drugs affect the gut microbiota of diabetic patients.In this letter,we discuss that different dietary patterns and the use of hypoglycemic agents may have an impact on changes in gut microbiota in diabetic patients.展开更多
Structure of PAN fibers during pre-oxidation and carbonization was studied using two dimensional small angle X-ray scattering/wide angle X-ray diffraction （2D SAXS/WAXD）. The SAXS results show that during pre-oxidat...Structure of PAN fibers during pre-oxidation and carbonization was studied using two dimensional small angle X-ray scattering/wide angle X-ray diffraction （2D SAXS/WAXD）. The SAXS results show that during pre-oxidation between 180 ℃ and 275 ℃, the volume content of microvoids increases with the temperature increasing, which may be one of reasons for the decrease of tensile strength ofpre-oxidized fibers. 253 ℃ was the critical transition temperature, the length, diameter, aspect ratio and orientation distribution of microvoids increased with temperature before this temperature and decreased after this temperature. After the high temperature carbonization, lots of spindly microvoids formed. WAXD patterns demonstrate that the crystallite size of PAN fibers first increased before 230 ℃ and then decreased with the increase of temperature during the pre-oxidation. The diffraction peak of PAN fibers at 2θ ≈ 17°almost disappeared at the end of pre- oxidation while the diffraction peak of aromatic structure at 2θ ≈ 25° appeared at 253 ℃. During carbonization, the peak intensity at 2θ ≈ 25° increased apparently due to the formation of graphite structure. The results obtained give a deep understanding of the microstrncture development in the PAN fibers during pre-oxidation and carbonization, which is important for the preparation of high performance carbon fibers.展开更多
文摘Irritable bowel syndrome(IBS)is a common chronic functional gastrointestinal disorder affecting 10%-22%of adults.Its development is closely related to the gut microbiota,and the inflammatory and immune responses triggered by the gut microbiota can lead to IBS.Vitamin D(VD)effectively treats IBS with fewer side effects by improving gut microbiota,immune regulation,and anti-inflammatory effects.In the future,it is necessary to carry out epidemiological studies on the relationship between VD and IBS,clinical studies on the efficacy of supplementing VD to improve IBS,and animal studies on the mechanism of VD improving IBS.Therefore,this paper discussed the relationship between VD and IBS.
文摘The diet structure of diabetic patients is different from that of normal people.Diabetic patients also need to take hypoglycemic drugs to regulate blood sugar.Both dieting and drugs affect the gut microbiota of diabetic patients.In this letter,we discuss that different dietary patterns and the use of hypoglycemic agents may have an impact on changes in gut microbiota in diabetic patients.
基金financially supported by Innovation Method Fund of China(2011IM030400)NSFC(No.10835008)+4 种基金the Knowledge Innovation Project of CAS(No.KJCX2-YW-N39)973 Program(No.2011CB605604)the Opening Foundation of Shenzhen Key Laboratory of Functional Polymers(FP20120012)Natural Science Foundation of Shenzhen University(Grant no.201204)the Shenzhen basic research project(JCYJ20120614085820810)
文摘Structure of PAN fibers during pre-oxidation and carbonization was studied using two dimensional small angle X-ray scattering/wide angle X-ray diffraction （2D SAXS/WAXD）. The SAXS results show that during pre-oxidation between 180 ℃ and 275 ℃, the volume content of microvoids increases with the temperature increasing, which may be one of reasons for the decrease of tensile strength ofpre-oxidized fibers. 253 ℃ was the critical transition temperature, the length, diameter, aspect ratio and orientation distribution of microvoids increased with temperature before this temperature and decreased after this temperature. After the high temperature carbonization, lots of spindly microvoids formed. WAXD patterns demonstrate that the crystallite size of PAN fibers first increased before 230 ℃ and then decreased with the increase of temperature during the pre-oxidation. The diffraction peak of PAN fibers at 2θ ≈ 17°almost disappeared at the end of pre- oxidation while the diffraction peak of aromatic structure at 2θ ≈ 25° appeared at 253 ℃. During carbonization, the peak intensity at 2θ ≈ 25° increased apparently due to the formation of graphite structure. The results obtained give a deep understanding of the microstrncture development in the PAN fibers during pre-oxidation and carbonization, which is important for the preparation of high performance carbon fibers.
