Abstract: The present invention relates to the use of MtNAC33 gene and a protein encoded thereby in the cultivation of high-biomass and drought-tolerant alfalfa, belonging to the technical field of plant genetic engineering. The plant protein encoded by MtNAC33 gene has the amino acid sequence set forth in SEQ ID NO: 2, and MtNAC33 gene has the nucleotide sequence set forth in SEQ ID NO: 1. In the present invention, the drought tolerance of Arabidopsis thaliana and alfalfa can be significantly improved by regulating the expression level of MtNAC33 in alfalfa. The phenotypes of delayed flowering, increased leaf-to-stem ratio and more biomass in alfalfa were also developed, which has an important effect for genetic improvement of stress resistance and biomass of forage grass and other crops.

Abstract: Disclosed is a method for preparing konjac glucomannan gum. The method includes steps as follows: (1) preparing konjac sol; (2) preparing an amino acid solution by means of L-lysine and L-arginine; and (3) adding the amino acid solution into the konjac sol, and carrying out stirring, standing, and water-bath heating to obtain the konjac gum. According to the method for preparing konjac glucomannan gum in the present invention, the konjac glucomannan is modified by means of the L-lysine and the L-arginine according to a certain ratio, and hydroxyl ions in L-lysine and L-arginine solutions can remove acetyl groups in konjac glucomannan molecules under a heating condition such that thermostable gum can be formed, and properties of the konjac glucomannan gum are improved. According to the present invention, production processes for a konjac gum product are changed, and nutritional functions of the konjac product are added.

Abstract: A silty floating mud collection device, which includes a drive cylinder, an outer sleeve, a sampler barrel, an lug cover plate, a turning cover, a control ring and a control rod, where the drive cylinder includes a cylinder liner, a piston and a piston rod; the outer sleeve is fixedly connected below the cylinder liner; the sampler barrel is detachably installed inside the outer sleeve; the lug cover plate is fixedly connected to a lower end of the piston rod, and can close an upper-end opening of the sampler barrel; the turning cover is turnably installed at a lower end of the outer sleeve, and can close a lower-end opening of the sampler barrel; the control ring is located below the sampler barrel, and is used to block the turning cover which is in an open state; and an upper end of the control rod is connected to the lug cover plate, and a lower end of the control rod is connected to the control ring.