People living on the high plateaus of the world have long fascinated biological anthropologists and geneticists because they live in ＂thin air＂ and epitomize an extreme of human biological adaptation.
A variant of Fermat’s last Diophantine equation is proposed by adjusting the number of terms in accord with the power of terms and a theorem describing the solubility conditions is stated. Numerically obtained primit...A variant of Fermat’s last Diophantine equation is proposed by adjusting the number of terms in accord with the power of terms and a theorem describing the solubility conditions is stated. Numerically obtained primitive solutions are presented for several cases with number of terms equal to or greater than powers. Further, geometric representations of solutions for the second and third power equations are devised by recasting the general equation in a form with rational solutions less than unity. Finally, it is suggested to consider negative and complex integers in seeking solutions to Diophantine forms in general.展开更多
It was widely thought that 3 variants of Kunitz type trypsin inhibitor(SBTi A 2) existed in soybean seed storage protein.Three of codominant alleles Ti a,Ti b and Ti c were identified to decode these SBTi A 2 inhibito...It was widely thought that 3 variants of Kunitz type trypsin inhibitor(SBTi A 2) existed in soybean seed storage protein.Three of codominant alleles Ti a,Ti b and Ti c were identified to decode these SBTi A 2 inhibitors and the amino acid sequences of them were determined,of which one or more different amino acid were found.Ti d was a new variant allele of SBTi A 2 discovered after analyzing more than 15 000 samples of soybean seed in China.In order to study the structure features of Ti d protein,the amino acid sequence of this protein was deduced from its coding region which was amplified by PCR from soybean genomic DNA and sequenced.By comparison with Ti a protein,two different amino acid residue were found between Ti a and Ti d proteins.One was an extra Ala inserted in the signal peptide of Ti d,with 8 residues from N terminal,and the other existed in the mature protein,with Glu 69 in Ti a protein turned into Lys 69 in Ti d protein.The amino acid sequence of Ti d mature protein was also different from those of Ti a and Ti b.展开更多
报道了巨龙竹Dendrocalamus sinicus的一个新变种——厚壁巨龙竹Dendrocalamus sinicus var.pachyloenus Hui, W. Y. Liu et. Z. J. Shi,区别在于该新变种节部显著隆起,秆基部5-10节具有发达的气生根,秆壁明显较厚。由于其秆壁较厚,单...报道了巨龙竹Dendrocalamus sinicus的一个新变种——厚壁巨龙竹Dendrocalamus sinicus var.pachyloenus Hui, W. Y. Liu et. Z. J. Shi,区别在于该新变种节部显著隆起,秆基部5-10节具有发达的气生根,秆壁明显较厚。由于其秆壁较厚,单位面积秆材产量明显较高,具有更高的开发利用价值,是一个优良种质资源。展开更多
文摘People living on the high plateaus of the world have long fascinated biological anthropologists and geneticists because they live in ＂thin air＂ and epitomize an extreme of human biological adaptation.
文摘A variant of Fermat’s last Diophantine equation is proposed by adjusting the number of terms in accord with the power of terms and a theorem describing the solubility conditions is stated. Numerically obtained primitive solutions are presented for several cases with number of terms equal to or greater than powers. Further, geometric representations of solutions for the second and third power equations are devised by recasting the general equation in a form with rational solutions less than unity. Finally, it is suggested to consider negative and complex integers in seeking solutions to Diophantine forms in general.
文摘It was widely thought that 3 variants of Kunitz type trypsin inhibitor(SBTi A 2) existed in soybean seed storage protein.Three of codominant alleles Ti a,Ti b and Ti c were identified to decode these SBTi A 2 inhibitors and the amino acid sequences of them were determined,of which one or more different amino acid were found.Ti d was a new variant allele of SBTi A 2 discovered after analyzing more than 15 000 samples of soybean seed in China.In order to study the structure features of Ti d protein,the amino acid sequence of this protein was deduced from its coding region which was amplified by PCR from soybean genomic DNA and sequenced.By comparison with Ti a protein,two different amino acid residue were found between Ti a and Ti d proteins.One was an extra Ala inserted in the signal peptide of Ti d,with 8 residues from N terminal,and the other existed in the mature protein,with Glu 69 in Ti a protein turned into Lys 69 in Ti d protein.The amino acid sequence of Ti d mature protein was also different from those of Ti a and Ti b.
文摘报道了巨龙竹Dendrocalamus sinicus的一个新变种——厚壁巨龙竹Dendrocalamus sinicus var.pachyloenus Hui, W. Y. Liu et. Z. J. Shi,区别在于该新变种节部显著隆起,秆基部5-10节具有发达的气生根,秆壁明显较厚。由于其秆壁较厚,单位面积秆材产量明显较高,具有更高的开发利用价值,是一个优良种质资源。
