Andrias davidianus,i.e.Chinese giant salamander(CGS),is one of the largest and oldest amphibians existing in the world and is also one of the valuable biological resources of China.Wild CGS has been threatened with ex...Andrias davidianus,i.e.Chinese giant salamander(CGS),is one of the largest and oldest amphibians existing in the world and is also one of the valuable biological resources of China.Wild CGS has been threatened with extinction in the past decades due to over capturing,deterioration of natural environment,the slow breeding and growth of the wild species in nature.However,in the past twenty years,with the breakthrough and progress of artificial breeding technology by artificial insemination,the number of artificially cultivated CGS has increased rapidly.Artificially cultivated CGS can either be released to the CGS living environment to increase the population in nature or legally applied in food and medicinal industry as a feedstock due to the unique nutritional and medicinal values of CGS as recorded historically.In this review,the nutritional components,bioactive components and medicinal activities of the artificially cultivated CGS will be summarized.The mucus,skin,meat and bone of CGS contain many different bioactive substances thereby having various medicinal activities including anti-aging,anti-fatigue,anti-tumor,therapy of burn and anti-infection and other physiological functions.This paper will further discuss the potential applications of the artificially cultivated CGS in healthcare industry and prospects of future technological development.展开更多
13 water quality parameters were tested from 38 reaches of 34 counties in Guizhou where Chinese giant salamander(Andrias davidianus) distributed over the past 30 years. Dissolved oxygen and p H were found to be signif...13 water quality parameters were tested from 38 reaches of 34 counties in Guizhou where Chinese giant salamander(Andrias davidianus) distributed over the past 30 years. Dissolved oxygen and p H were found to be significant determinants of the species distribution in recent years(P<0.05). There was no Chinese giant salamander distribution in the recent five years in rivers with dissolved solids of greater than 415 mg/L, conductivity of greater than 639 us/cm, salinity of greater than 0.31 ppt and total hardness of greater than 150 mg/L. Sensitive to environment, the Chinese giant salamander is an important indicator for environmental quality, so it could be used as one of the environmental indicator. Eutrophication, chemical fertilizer, pesticides and inorganic pollutants may be one of reasons driving wild CGS into extinction.展开更多
Chinese giant salamander(CGS, Andrias davidianus) is experiencing the threat of extinction. It is disappearing gradually, because of overharvesting, environmental pollution, specially river pollution, activity of huma...Chinese giant salamander(CGS, Andrias davidianus) is experiencing the threat of extinction. It is disappearing gradually, because of overharvesting, environmental pollution, specially river pollution, activity of human exploitation, and so on. We conducted community interview fieldworks to collect respondent data from Xieba Country(not reserve) situated in Zhengan County of Guizhou Province, where one of the places known by historical giant salamander records in Guizhou. Through the analysis of the collected data, we created quantitative data of use for conservation management on the local status of salamander populations, and we compared our data with those available data of Y. Pan et al., who investigated the status of CGS in 3 reserves in Guizhou Province in 2015.The conclusions have a similar trend, which proved that the collected data were creditable. Through statistical analysis of the comparison data, the number of wild CGS decreased actually followed the increase of artificial framing.Because of the source of breeding to catch wild CGS, overharvesting was likely the most reason to make wild CGS decline.展开更多
Chinese giant salamander(Andrias davidianus)is salamander germplasm resource that only distributed in China.It is the material basis of the evolution principle research,genetic research and artificial breeding.Since t...Chinese giant salamander(Andrias davidianus)is salamander germplasm resource that only distributed in China.It is the material basis of the evolution principle research,genetic research and artificial breeding.Since the 1990s,overharvesting,water pollution and habitat changes have seriously destroyed the germplasm resources of A.davidianus,their population density has decreased since then.Strengthening the protection and rational utilization of A.davidianus germplasm resources are key factors in impacting the healthy,stable and sustainable development of A.davidianus industry.Under the above background,we discussed the current problems with the protection for A.davidianus germplasm resources,put forward suggestions for the conservation of A.davidianus germplasm resources.It is expected to provide a reference to effective protection for A.davidianus germplasm resources,and provide a scientific foundation for further studies,so as to promote the high-quality development of related industry.展开更多
To construct a directional cDNA library from Chinese giant salamander Andrias davidianus liver by SMART(switching mechanism at 5′ end of RNA transcript)technique, we purified the mRNA from Andrias davidianus liver an...To construct a directional cDNA library from Chinese giant salamander Andrias davidianus liver by SMART(switching mechanism at 5′ end of RNA transcript)technique, we purified the mRNA from Andrias davidianus liver and the first strand cDNA was synthesized through reverse transcription by using a modified oligo(dT)primer(contained sfi ⅠB site). We used the SMART oligonucleotide (contained sfi ⅠA site) as a template so that the first strand cDNA could be extended over the 5′ end of mRNA. The double strand cDNA was amplified by LD PCR (long distance PCR) with the above two primers and then digested by sfi Ⅰ (ⅠA and ⅠB) restriction enzyme. After cDNA fractionation through CHROMA SPIN column, the double strand cDNA was ligated into the sfi Ⅰ digested λtripIEx2 vector and then the recombinant DNA was packaged in vitro . The content of the unamplified Andrias davidianus liver cDNA library is 1 5×10 6 in which the percentage of recombinant clones is about 98 9%. The titer of the amplified cDNA library is 1 0×10 10 pfu/ml and the average exogenous inserts of the recombinants is 1 25 kb. These results show that the Andrias davidianus liver cDNA library has excellent quality.展开更多
为寻求我国大鲵资源利用新途径,并建立大鲵尾部油的最佳提取方法及工艺,采用酶解法从大鲵尾部脂肪组织中提取大鲵尾部油,并对所得的大鲵尾部油进行理化性质及脂肪酸组成分析。结果表明,酶解法提取大鲵尾部油的最佳工艺条件为:酶添加量0....为寻求我国大鲵资源利用新途径,并建立大鲵尾部油的最佳提取方法及工艺,采用酶解法从大鲵尾部脂肪组织中提取大鲵尾部油,并对所得的大鲵尾部油进行理化性质及脂肪酸组成分析。结果表明,酶解法提取大鲵尾部油的最佳工艺条件为:酶添加量0.3%,料液比1∶1.0,酶解时间1.0 h,酶解温度60℃,p H 6.5;在最佳条件下,提取率为98.53%。所提的大鲵尾部油达到我国水产行业SC/T 3502—2000粗鱼油的一级标准。酶解法所提大鲵尾部油中检测出17种脂肪酸,单不饱和脂肪酸(MUFA)含量为49.42%,多不饱和脂肪酸(PUFA)含量为29.35%。展开更多
基金The authors would like to thank the National Key R&D Plan of China for providing support(NO:2016YFD0400203-4).
文摘Andrias davidianus,i.e.Chinese giant salamander(CGS),is one of the largest and oldest amphibians existing in the world and is also one of the valuable biological resources of China.Wild CGS has been threatened with extinction in the past decades due to over capturing,deterioration of natural environment,the slow breeding and growth of the wild species in nature.However,in the past twenty years,with the breakthrough and progress of artificial breeding technology by artificial insemination,the number of artificially cultivated CGS has increased rapidly.Artificially cultivated CGS can either be released to the CGS living environment to increase the population in nature or legally applied in food and medicinal industry as a feedstock due to the unique nutritional and medicinal values of CGS as recorded historically.In this review,the nutritional components,bioactive components and medicinal activities of the artificially cultivated CGS will be summarized.The mucus,skin,meat and bone of CGS contain many different bioactive substances thereby having various medicinal activities including anti-aging,anti-fatigue,anti-tumor,therapy of burn and anti-infection and other physiological functions.This paper will further discuss the potential applications of the artificially cultivated CGS in healthcare industry and prospects of future technological development.
基金Supported by the National Natural Science Foundation of China(31360144)the Fund of the Key Laboratory of Biodiversity Preservation,Guiyang University
文摘13 water quality parameters were tested from 38 reaches of 34 counties in Guizhou where Chinese giant salamander(Andrias davidianus) distributed over the past 30 years. Dissolved oxygen and p H were found to be significant determinants of the species distribution in recent years(P<0.05). There was no Chinese giant salamander distribution in the recent five years in rivers with dissolved solids of greater than 415 mg/L, conductivity of greater than 639 us/cm, salinity of greater than 0.31 ppt and total hardness of greater than 150 mg/L. Sensitive to environment, the Chinese giant salamander is an important indicator for environmental quality, so it could be used as one of the environmental indicator. Eutrophication, chemical fertilizer, pesticides and inorganic pollutants may be one of reasons driving wild CGS into extinction.
基金Supported by National Natural Science Foundation of China(31360144)the Key Laboratory of Biodiversity Preservation,Guiyang University
文摘Chinese giant salamander(CGS, Andrias davidianus) is experiencing the threat of extinction. It is disappearing gradually, because of overharvesting, environmental pollution, specially river pollution, activity of human exploitation, and so on. We conducted community interview fieldworks to collect respondent data from Xieba Country(not reserve) situated in Zhengan County of Guizhou Province, where one of the places known by historical giant salamander records in Guizhou. Through the analysis of the collected data, we created quantitative data of use for conservation management on the local status of salamander populations, and we compared our data with those available data of Y. Pan et al., who investigated the status of CGS in 3 reserves in Guizhou Province in 2015.The conclusions have a similar trend, which proved that the collected data were creditable. Through statistical analysis of the comparison data, the number of wild CGS decreased actually followed the increase of artificial framing.Because of the source of breeding to catch wild CGS, overharvesting was likely the most reason to make wild CGS decline.
基金Supported by the Project of Henan Province for Tackling Key Problems in Science and Technology(212102110386)the National Spark Program Project(2011ga750009).
文摘Chinese giant salamander(Andrias davidianus)is salamander germplasm resource that only distributed in China.It is the material basis of the evolution principle research,genetic research and artificial breeding.Since the 1990s,overharvesting,water pollution and habitat changes have seriously destroyed the germplasm resources of A.davidianus,their population density has decreased since then.Strengthening the protection and rational utilization of A.davidianus germplasm resources are key factors in impacting the healthy,stable and sustainable development of A.davidianus industry.Under the above background,we discussed the current problems with the protection for A.davidianus germplasm resources,put forward suggestions for the conservation of A.davidianus germplasm resources.It is expected to provide a reference to effective protection for A.davidianus germplasm resources,and provide a scientific foundation for further studies,so as to promote the high-quality development of related industry.
文摘To construct a directional cDNA library from Chinese giant salamander Andrias davidianus liver by SMART(switching mechanism at 5′ end of RNA transcript)technique, we purified the mRNA from Andrias davidianus liver and the first strand cDNA was synthesized through reverse transcription by using a modified oligo(dT)primer(contained sfi ⅠB site). We used the SMART oligonucleotide (contained sfi ⅠA site) as a template so that the first strand cDNA could be extended over the 5′ end of mRNA. The double strand cDNA was amplified by LD PCR (long distance PCR) with the above two primers and then digested by sfi Ⅰ (ⅠA and ⅠB) restriction enzyme. After cDNA fractionation through CHROMA SPIN column, the double strand cDNA was ligated into the sfi Ⅰ digested λtripIEx2 vector and then the recombinant DNA was packaged in vitro . The content of the unamplified Andrias davidianus liver cDNA library is 1 5×10 6 in which the percentage of recombinant clones is about 98 9%. The titer of the amplified cDNA library is 1 0×10 10 pfu/ml and the average exogenous inserts of the recombinants is 1 25 kb. These results show that the Andrias davidianus liver cDNA library has excellent quality.
文摘为寻求我国大鲵资源利用新途径,并建立大鲵尾部油的最佳提取方法及工艺,采用酶解法从大鲵尾部脂肪组织中提取大鲵尾部油,并对所得的大鲵尾部油进行理化性质及脂肪酸组成分析。结果表明,酶解法提取大鲵尾部油的最佳工艺条件为:酶添加量0.3%,料液比1∶1.0,酶解时间1.0 h,酶解温度60℃,p H 6.5;在最佳条件下,提取率为98.53%。所提的大鲵尾部油达到我国水产行业SC/T 3502—2000粗鱼油的一级标准。酶解法所提大鲵尾部油中检测出17种脂肪酸,单不饱和脂肪酸(MUFA)含量为49.42%,多不饱和脂肪酸(PUFA)含量为29.35%。
