SINCE high-pressure metapelitic rocks have been discovered in the Beiketan area of eastern Al-tun Mountains,a set of eclogite has been recognized in south of Jianggesayi,western Altun.The eclogite,associated with quar...SINCE high-pressure metapelitic rocks have been discovered in the Beiketan area of eastern Al-tun Mountains,a set of eclogite has been recognized in south of Jianggesayi,western Altun.The eclogite,associated with quartz-garnet-clinopyroxenite and metamorphosed retrogradelyto garnet-amphibolite partially,is exposed in the Proterozoic meso- to hypometamorphic rocksand can be traced eastward to northwest of Mangya asbestos deposit,for about 200展开更多
AIM To clone and identify the whole cDNA ofMXR7 gene and to find out its expression inhuman HCC,and normal tissues.METHODS The DNA primers were designed andsynthesized according to the whole cDNAsequence of MXR? gene....AIM To clone and identify the whole cDNA ofMXR7 gene and to find out its expression inhuman HCC,and normal tissues.METHODS The DNA primers were designed andsynthesized according to the whole cDNAsequence of MXR? gene.The cDNA of humanHCC was taken as the template while the cDNA ofMXR7 gene was synthesized by polymerasechain reaction（PCR）.Recombinant DNAconforming to reading frame was constructed byconnecting purified PCR product of the cDNA ofMXR? gene with expression vector pGEX-5X-1 offusion protein.The plasmid MXRT/pGEX-5X-1was identified by sequencing.Using <sup>32</sup>p labeledMXR? cDNA as probe,MXR7 mRNA expressionwas detected by Northern blot analysis in 12different human normal tissues,7 preoperativelyuntreated non-liver tumor tissues,30preoperatively untreated HCC,theparacancerous liver tissues and 12 normal livertissues samples.RESULTS Restriction enzyme and sequenceanalysis confirmed that the insertion sequence invector pGEX-5X-1 was the same as the cDNAsequence of MXR7 gene.Northern blot analysisshowed no expression of MXR? mRNA in 12 kindsof normal human tissues including liver,7 tumortissues in other sites and 12 normal livertissues,the frequencies of MXR7 mRNA expression in HCC and paracancerous livertissues were 76.6% and 13.3%,respectively.The frequency of MXR7 mRNA expression in HCCwithout elevation of serum AFP and in HCC【5cm was 90%（9/10）and 83.3%（5/6）,respectively.CONCLUSION MXR7 mRNA is highly expressedin human HCC,which is specific and occurs at anearly stage of HCC,suggesting MXR7 mRNA canbe a tumor biomarker for HCC.The detection ofMXR7 mRNA expression in the biopsied livertissue is helpful in discovering early subclinicalliver cancer in those with negative serum AFP.展开更多
Based on the observational data of an internal soliton in the northern South China Sea (SCS) on June 14, 1998, the possible source of the internal soliton is analyzed, and some of its characteristic parameters such as...Based on the observational data of an internal soliton in the northern South China Sea (SCS) on June 14, 1998, the possible source of the internal soliton is analyzed, and some of its characteristic parameters such as phase speed, wave length, etc. are computed. Based on the analyses of the vertical modes of the internal wave, the characteristics of the wave-induced current during the propagation of the internal soliton are studied. A regularized long wave (RLW) equation numerical model considering effects of multi-fac-tors is employed, and the observed environmental parame-ters are used as the initial conditions to simulate the propa-gation and evolution of the internal soliton in the continental shelf of the northern SCS.展开更多
Viral variation may change pathogenicity, escape immunity, lead to persistence infection, and cause drug resistance against antiviral therapy. This study was undertaken to investigate the effects of HBV gene variation...Viral variation may change pathogenicity, escape immunity, lead to persistence infection, and cause drug resistance against antiviral therapy. This study was undertaken to investigate the effects of HBV gene variation on the progression of disease and on the efficacy of antiviral therapy for patients with chronic hepatitis B(CHB). METHODS:Hepatitis B virus (HBV) gene mutational sites were detected using gene chip in selected hepatitis B patients. RESULTS:In the patients HBeAg did not show serologic conversion or HBeAg(-)/anti-HBe(+), but their HBV DNA remained positive 24 weeks after α-interferon therapy, which was associated with mutations of nt1896, nt1814, nt1762 and nt1764. In the patients, that HBV DNA levels decreased or were undetectable, but rebounded later after antiviral therapy by lamivudine was associated with mutations of aa528 and(or) aa552(i.e.YMDD mutation), which resulted in lamivudine-resistance. YMDD mutation was prone to occur 52 weeks after lamivudine therapy in some chronic hepatitis B patients (26.4%). Nt1896 mutation was common in most chronic hepatitis B patients (68.5%). Chronic severe hepatitis, cirrhosis, and primary liver carcinoma were related to the mutations of nt1896, nt1762 and nt1764. CONCLUSIONS:HBV gene mutations could aggravate patient's condition and affect the efficacy of antiviral therapy. The regular detection of HBV gene mutation is helpful for identification of disease prognosis and adjustment of therapeutic strategy.展开更多
THE formation periods,properties and initial elevations of Tibetan planation surfaces are keysto the issues ot the plateau uplift.Li et al.believed that the study on planation surfaces hasfar-reaching significance.Yan...THE formation periods,properties and initial elevations of Tibetan planation surfaces are keysto the issues ot the plateau uplift.Li et al.believed that the study on planation surfaces hasfar-reaching significance.Yang et al.indicated that the summit level and the basin level展开更多
Background Endovascular stent-grafting is widely used to treat thoracic aortic dissection. However, little information is available regarding outcome following simultaneous exclusion of multiple tears. This report det...Background Endovascular stent-grafting is widely used to treat thoracic aortic dissection. However, little information is available regarding outcome following simultaneous exclusion of multiple tears. This report details eight years of experience using simultaneous multi-tear exclusion for treatment of Stanford type B thoracic aortic dissection resulting in successful aortic remodeling without adverse events. Methods From September 1998 to January 2006, 29 type B thoracic aortic dissection patients （24 men, 5 women; 27 chronic, 2 acute; mean age 58 years, range 45-77 years） were treated by simultaneous multi-tear exclusion in our center. Magnetic resonance angiography was used as the preoperative evaluation method. Different kinds of stent-grafts were used. The patients were followed up with contrast-enhanced spiral computed tomography at 6 months postoperatively and yearly thereafter. Results Twenty-nine surgeries were completed successfully using at least 2 stent-grafts per patient （range： 2-6, mean： 2.7）. No major procedure-related complications, such as rupture, paraplegia, aortic branch ischemia or cerebral infarction were observed. During follow-up, favorable remodeling of the aorta was observed. Conclusions The mid-term result of thoracic aortic dissection with simultaneous multi-tear exclusion was satisfactory. With the improvement of stent-grafts, simultaneous multi-tear exclusion should find wider application and become an optimal strategy for thoracic aortic dissection.展开更多
CYCLICITY of basin development and evolution gives rise to several sets of source beds in Tarim Basin. Many times of generation and expulsion of hydrocarbon caused many times of petroleum accumulation and reservoir fo...CYCLICITY of basin development and evolution gives rise to several sets of source beds in Tarim Basin. Many times of generation and expulsion of hydrocarbon caused many times of petroleum accumulation and reservoir formation, and many times of tectonic activity probably resulted in the re-distribution and complete destruction of formed reservoirs. It will help us to recognize the patterns of petroleum accumulation in Tarim Basin and direct the展开更多
A new nor-neolignan, named ellisinin A (1), has been isolated from the traditional Tibetan medicinal plants of Cremanthodium ellisii. Its structure has been determined on the basis of spectroscopic evidence, especiall...A new nor-neolignan, named ellisinin A (1), has been isolated from the traditional Tibetan medicinal plants of Cremanthodium ellisii. Its structure has been determined on the basis of spectroscopic evidence, especially by 2DNMR (H-1-(HCOSY)-H-1, HMQC, HMBC).展开更多
A novel chemiluminescence .Cl sensor combined with flow-injectionanalysis nas been developed for determining free chlorine in tap water. Takeanalytical reagent luminol was immobilied on an anion exchange res in column...A novel chemiluminescence .Cl sensor combined with flow-injectionanalysis nas been developed for determining free chlorine in tap water. Takeanalytical reagent luminol was immobilied on an anion exchange res in column.Will ie a volume of the sodium hydroxide passed the column, luminol was elutedfrom the res in in a Ika I me aqueous solut ion and then mixed wi th the samples tream to react and produce CI. The CI emiss ion miens ity was correlated￣ ￣8 ￣' u.i th the standard C10 concentration in the lange of I x 10 to 4 x 10 g ml, andthe detect ion I imi t was & x 10-' g .l-' C10--. Interfering metal ions plesent inwa ter wele effect ively separated by a pre-colunm ca t ion exchanger. A completeana lys is, including sampl lug and washing, could be performed in 1 min wi tha relative standald deviation of less than 5%. The sensor was stable for over 200t imes and has been appl led successfully to the determination of C10 in tapwa t e i.展开更多
Two new neolignan glucosides, tortosides D and E were isolated from plants of Pedicularis torta. On the basis of spectral evidence, tortosides D and E were determined as (7R.8S)-dehydrodiconiferyl-9-O-beta-D-4 '&#...Two new neolignan glucosides, tortosides D and E were isolated from plants of Pedicularis torta. On the basis of spectral evidence, tortosides D and E were determined as (7R.8S)-dehydrodiconiferyl-9-O-beta-D-4 ''-O-methyl-glucopyranoside and (7R,8S)-5-methoxy-dihydrodehydrodiconiferyl alcohol-9'-O-beta-D-glucopyranoside, respectively.展开更多
A pregnane glycoside and a lignan glycoside were isolated from the aerial parts of Rubus amabilis. Their structures were elucidated as 3-O-beta-D-glucopyranosyl-3 beta.15 alpha-dihydroxypregn-5-en-20-one and (-)-secoi...A pregnane glycoside and a lignan glycoside were isolated from the aerial parts of Rubus amabilis. Their structures were elucidated as 3-O-beta-D-glucopyranosyl-3 beta.15 alpha-dihydroxypregn-5-en-20-one and (-)-secoisolariciresinol-O-alpha-L-rhamnopyranoside using spectroscopic and chemical methods.展开更多
A new benzofuranosesquiterpene dimer, named virgaurin B, has been isolated from the roots of Ligularia virgaurea and its structure has been elucidated by spectroscopic evidence.
The constitutive relationship for MP159 alloy, a kind of high strength cobalt-base superalloy, was studied based on the experimental results of compression tests carried out in the THERMECMASTER-Z hot work simulating ...The constitutive relationship for MP159 alloy, a kind of high strength cobalt-base superalloy, was studied based on the experimental results of compression tests carried out in the THERMECMASTER-Z hot work simulating test machine. The constitutive relationship model using Zener-Hollomon parameter as primary variable is proposed, and the constitutive equation for MP159 alloy is firstly formulized. This equation well represents the relationship of flow stress with thermomechanical,parameters, i.e. strain, strain rate and temperature, in a large deformation (a true strain of 1.10) and a wide range of deformation temperatures and strain rates, it can be used for the finite element simulation of plastic forming process and the dissipative structure theory and dynamic material modeling.展开更多
LaC2+, LaC22+, LaC3 and LaC3- clusters have been studied using B3LYP density functional method. Four isomers with C-2v, C-s, C-infinity v and D-infinity h symmetry were presented for LaC2+ and LaC22+. Meanwhile, two s...LaC2+, LaC22+, LaC3 and LaC3- clusters have been studied using B3LYP density functional method. Four isomers with C-2v, C-s, C-infinity v and D-infinity h symmetry were presented for LaC2+ and LaC22+. Meanwhile, two spin states, namely, singlet and triplet for LaC2+, doublet and quartet for LaC22+ were considered The results indicated that ring isomers with C-2v and C-s symmetry are the most stable for La-C2(+) at both spin states and for LaC22+ at quartet state. Whereas for LaC22+ at doublet state, linear isomer with C-infinity v symmetry is energetically favored, For LaC3 and LaC3- clusters,, three isomers have been presented for each cluster, that is, two ring isomers with C-2v symmetry ( in one of them, La forms two single bonds with two carbons, and in another, La forms a double bond with carbon), and one linear isomer with C-infinity v symmetry. The results revealed that the ring isomer in which La forms two single bonds with carbons is the lowest in energy.展开更多
The structure of Mo-15.16 Si, Mo-30 Si and Mo-36.3 Si (wt pct) elemental powder mixture during mechanical alloying was studied using electron microscopy and X-ray diffraction. It had been found that, in all the system...The structure of Mo-15.16 Si, Mo-30 Si and Mo-36.3 Si (wt pct) elemental powder mixture during mechanical alloying was studied using electron microscopy and X-ray diffraction. It had been found that, in all the systems under study, silicon disappeared initially during mechanical alloying (MA). In the Mo-Si systems all products were in form of amorphous state after long time milling, but there were different intermediate products. MoSi2 and Mo5Si3 intermetallic compounds in the Mo-30Si and Mo-36.3Si (wt pct) were directly synthesized from elements through inter-diffussion process. The high density of defects and interface of nano-crystal lines induced by ball milling would promote the reaction process. Only in the Mo-15.16Si (wt pct) system was Mo(Si) supersaturated solid solution formed as an intermediate product. Schematic free-energy diagram of Mo-Si system based on the thermodynamics was used to analyze the difference among the intermediate state products.展开更多
A new neo-clerodane type diterpenoid,named soulidiol, has been isolated from Aster souliei and its structure was elucidated on basis of spectral and chemical methods to be 18, 19-dihydroxy-5 alpha,10 beta-neo-cleroda-...A new neo-clerodane type diterpenoid,named soulidiol, has been isolated from Aster souliei and its structure was elucidated on basis of spectral and chemical methods to be 18, 19-dihydroxy-5 alpha,10 beta-neo-cleroda-3,13 (14)-dien-16,15-olide.展开更多
A new eudesmane sesquiterpene 1 beta, 4 beta, 6 alpha, 15-tetrahydroxyeudesmane isolated from Senecio flammeus and its structure determined on the basis of spectral data are reported.
文摘SINCE high-pressure metapelitic rocks have been discovered in the Beiketan area of eastern Al-tun Mountains,a set of eclogite has been recognized in south of Jianggesayi,western Altun.The eclogite,associated with quartz-garnet-clinopyroxenite and metamorphosed retrogradelyto garnet-amphibolite partially,is exposed in the Proterozoic meso- to hypometamorphic rocksand can be traced eastward to northwest of Mangya asbestos deposit,for about 200
基金the National Natural Science Foundation of China,No.39770379the National Basic Research Project("973")SUGEN,USA.
文摘AIM To clone and identify the whole cDNA ofMXR7 gene and to find out its expression inhuman HCC,and normal tissues.METHODS The DNA primers were designed andsynthesized according to the whole cDNAsequence of MXR? gene.The cDNA of humanHCC was taken as the template while the cDNA ofMXR7 gene was synthesized by polymerasechain reaction（PCR）.Recombinant DNAconforming to reading frame was constructed byconnecting purified PCR product of the cDNA ofMXR? gene with expression vector pGEX-5X-1 offusion protein.The plasmid MXRT/pGEX-5X-1was identified by sequencing.Using <sup>32</sup>p labeledMXR? cDNA as probe,MXR7 mRNA expressionwas detected by Northern blot analysis in 12different human normal tissues,7 preoperativelyuntreated non-liver tumor tissues,30preoperatively untreated HCC,theparacancerous liver tissues and 12 normal livertissues samples.RESULTS Restriction enzyme and sequenceanalysis confirmed that the insertion sequence invector pGEX-5X-1 was the same as the cDNAsequence of MXR7 gene.Northern blot analysisshowed no expression of MXR? mRNA in 12 kindsof normal human tissues including liver,7 tumortissues in other sites and 12 normal livertissues,the frequencies of MXR7 mRNA expression in HCC and paracancerous livertissues were 76.6% and 13.3%,respectively.The frequency of MXR7 mRNA expression in HCCwithout elevation of serum AFP and in HCC【5cm was 90%（9/10）and 83.3%（5/6）,respectively.CONCLUSION MXR7 mRNA is highly expressedin human HCC,which is specific and occurs at anearly stage of HCC,suggesting MXR7 mRNA canbe a tumor biomarker for HCC.The detection ofMXR7 mRNA expression in the biopsied livertissue is helpful in discovering early subclinicalliver cancer in those with negative serum AFP.
基金This work wassupported by the National Natural Science Foundation of China (Grant No. 40006003) the Guangdong Provincial Natural Science Foundation of China (Grant No. 990310) LOPSO, SOA.
文摘Based on the observational data of an internal soliton in the northern South China Sea (SCS) on June 14, 1998, the possible source of the internal soliton is analyzed, and some of its characteristic parameters such as phase speed, wave length, etc. are computed. Based on the analyses of the vertical modes of the internal wave, the characteristics of the wave-induced current during the propagation of the internal soliton are studied. A regularized long wave (RLW) equation numerical model considering effects of multi-fac-tors is employed, and the observed environmental parame-ters are used as the initial conditions to simulate the propa-gation and evolution of the internal soliton in the continental shelf of the northern SCS.
文摘Viral variation may change pathogenicity, escape immunity, lead to persistence infection, and cause drug resistance against antiviral therapy. This study was undertaken to investigate the effects of HBV gene variation on the progression of disease and on the efficacy of antiviral therapy for patients with chronic hepatitis B(CHB). METHODS:Hepatitis B virus (HBV) gene mutational sites were detected using gene chip in selected hepatitis B patients. RESULTS:In the patients HBeAg did not show serologic conversion or HBeAg(-)/anti-HBe(+), but their HBV DNA remained positive 24 weeks after α-interferon therapy, which was associated with mutations of nt1896, nt1814, nt1762 and nt1764. In the patients, that HBV DNA levels decreased or were undetectable, but rebounded later after antiviral therapy by lamivudine was associated with mutations of aa528 and(or) aa552(i.e.YMDD mutation), which resulted in lamivudine-resistance. YMDD mutation was prone to occur 52 weeks after lamivudine therapy in some chronic hepatitis B patients (26.4%). Nt1896 mutation was common in most chronic hepatitis B patients (68.5%). Chronic severe hepatitis, cirrhosis, and primary liver carcinoma were related to the mutations of nt1896, nt1762 and nt1764. CONCLUSIONS:HBV gene mutations could aggravate patient's condition and affect the efficacy of antiviral therapy. The regular detection of HBV gene mutation is helpful for identification of disease prognosis and adjustment of therapeutic strategy.
文摘THE formation periods,properties and initial elevations of Tibetan planation surfaces are keysto the issues ot the plateau uplift.Li et al.believed that the study on planation surfaces hasfar-reaching significance.Yang et al.indicated that the summit level and the basin level
基金This work was supported by a grant from the National 11th Five-Year 863 Plan
文摘Background Endovascular stent-grafting is widely used to treat thoracic aortic dissection. However, little information is available regarding outcome following simultaneous exclusion of multiple tears. This report details eight years of experience using simultaneous multi-tear exclusion for treatment of Stanford type B thoracic aortic dissection resulting in successful aortic remodeling without adverse events. Methods From September 1998 to January 2006, 29 type B thoracic aortic dissection patients （24 men, 5 women; 27 chronic, 2 acute; mean age 58 years, range 45-77 years） were treated by simultaneous multi-tear exclusion in our center. Magnetic resonance angiography was used as the preoperative evaluation method. Different kinds of stent-grafts were used. The patients were followed up with contrast-enhanced spiral computed tomography at 6 months postoperatively and yearly thereafter. Results Twenty-nine surgeries were completed successfully using at least 2 stent-grafts per patient （range： 2-6, mean： 2.7）. No major procedure-related complications, such as rupture, paraplegia, aortic branch ischemia or cerebral infarction were observed. During follow-up, favorable remodeling of the aorta was observed. Conclusions The mid-term result of thoracic aortic dissection with simultaneous multi-tear exclusion was satisfactory. With the improvement of stent-grafts, simultaneous multi-tear exclusion should find wider application and become an optimal strategy for thoracic aortic dissection.
文摘CYCLICITY of basin development and evolution gives rise to several sets of source beds in Tarim Basin. Many times of generation and expulsion of hydrocarbon caused many times of petroleum accumulation and reservoir formation, and many times of tectonic activity probably resulted in the re-distribution and complete destruction of formed reservoirs. It will help us to recognize the patterns of petroleum accumulation in Tarim Basin and direct the
文摘A new nor-neolignan, named ellisinin A (1), has been isolated from the traditional Tibetan medicinal plants of Cremanthodium ellisii. Its structure has been determined on the basis of spectroscopic evidence, especially by 2DNMR (H-1-(HCOSY)-H-1, HMQC, HMBC).
文摘A novel chemiluminescence .Cl sensor combined with flow-injectionanalysis nas been developed for determining free chlorine in tap water. Takeanalytical reagent luminol was immobilied on an anion exchange res in column.Will ie a volume of the sodium hydroxide passed the column, luminol was elutedfrom the res in in a Ika I me aqueous solut ion and then mixed wi th the samples tream to react and produce CI. The CI emiss ion miens ity was correlated￣ ￣8 ￣' u.i th the standard C10 concentration in the lange of I x 10 to 4 x 10 g ml, andthe detect ion I imi t was & x 10-' g .l-' C10--. Interfering metal ions plesent inwa ter wele effect ively separated by a pre-colunm ca t ion exchanger. A completeana lys is, including sampl lug and washing, could be performed in 1 min wi tha relative standald deviation of less than 5%. The sensor was stable for over 200t imes and has been appl led successfully to the determination of C10 in tapwa t e i.
文摘Two new neolignan glucosides, tortosides D and E were isolated from plants of Pedicularis torta. On the basis of spectral evidence, tortosides D and E were determined as (7R.8S)-dehydrodiconiferyl-9-O-beta-D-4 ''-O-methyl-glucopyranoside and (7R,8S)-5-methoxy-dihydrodehydrodiconiferyl alcohol-9'-O-beta-D-glucopyranoside, respectively.
基金the National Natural Science Foundation of China NO.29972017, the Foundation of Ministry of Education of China for Doctoral Prog
文摘A pregnane glycoside and a lignan glycoside were isolated from the aerial parts of Rubus amabilis. Their structures were elucidated as 3-O-beta-D-glucopyranosyl-3 beta.15 alpha-dihydroxypregn-5-en-20-one and (-)-secoisolariciresinol-O-alpha-L-rhamnopyranoside using spectroscopic and chemical methods.
文摘A new benzofuranosesquiterpene dimer, named virgaurin B, has been isolated from the roots of Ligularia virgaurea and its structure has been elucidated by spectroscopic evidence.
文摘The constitutive relationship for MP159 alloy, a kind of high strength cobalt-base superalloy, was studied based on the experimental results of compression tests carried out in the THERMECMASTER-Z hot work simulating test machine. The constitutive relationship model using Zener-Hollomon parameter as primary variable is proposed, and the constitutive equation for MP159 alloy is firstly formulized. This equation well represents the relationship of flow stress with thermomechanical,parameters, i.e. strain, strain rate and temperature, in a large deformation (a true strain of 1.10) and a wide range of deformation temperatures and strain rates, it can be used for the finite element simulation of plastic forming process and the dissipative structure theory and dynamic material modeling.
文摘LaC2+, LaC22+, LaC3 and LaC3- clusters have been studied using B3LYP density functional method. Four isomers with C-2v, C-s, C-infinity v and D-infinity h symmetry were presented for LaC2+ and LaC22+. Meanwhile, two spin states, namely, singlet and triplet for LaC2+, doublet and quartet for LaC22+ were considered The results indicated that ring isomers with C-2v and C-s symmetry are the most stable for La-C2(+) at both spin states and for LaC22+ at quartet state. Whereas for LaC22+ at doublet state, linear isomer with C-infinity v symmetry is energetically favored, For LaC3 and LaC3- clusters,, three isomers have been presented for each cluster, that is, two ring isomers with C-2v symmetry ( in one of them, La forms two single bonds with two carbons, and in another, La forms a double bond with carbon), and one linear isomer with C-infinity v symmetry. The results revealed that the ring isomer in which La forms two single bonds with carbons is the lowest in energy.
文摘The structure of Mo-15.16 Si, Mo-30 Si and Mo-36.3 Si (wt pct) elemental powder mixture during mechanical alloying was studied using electron microscopy and X-ray diffraction. It had been found that, in all the systems under study, silicon disappeared initially during mechanical alloying (MA). In the Mo-Si systems all products were in form of amorphous state after long time milling, but there were different intermediate products. MoSi2 and Mo5Si3 intermetallic compounds in the Mo-30Si and Mo-36.3Si (wt pct) were directly synthesized from elements through inter-diffussion process. The high density of defects and interface of nano-crystal lines induced by ball milling would promote the reaction process. Only in the Mo-15.16Si (wt pct) system was Mo(Si) supersaturated solid solution formed as an intermediate product. Schematic free-energy diagram of Mo-Si system based on the thermodynamics was used to analyze the difference among the intermediate state products.
文摘A new neo-clerodane type diterpenoid,named soulidiol, has been isolated from Aster souliei and its structure was elucidated on basis of spectral and chemical methods to be 18, 19-dihydroxy-5 alpha,10 beta-neo-cleroda-3,13 (14)-dien-16,15-olide.
文摘A new eudesmane sesquiterpene 1 beta, 4 beta, 6 alpha, 15-tetrahydroxyeudesmane isolated from Senecio flammeus and its structure determined on the basis of spectral data are reported.
