Subjects: Biology >> Botany >> Applied botany submitted time 2022-07-05 Cooperative journals: 《广西植物》
Abstract： In order to provide a scientific basis for optimum harvest time, the nutrient changes of avocado (Persea americana) fruit during the growth and development were studied. An approach of inductively coupled plasma atomic emission spectrometry, ion exchange chromatography derived after ninhydrin column, reflux extraction, burning and GC-MS technique was applied to determine the contents of mineral elements, ash, amino acids, crude fat, and fatty acid composition in three avocado cultivars (‘HASS’, ‘V3’ and ‘V4’), at different growth and development time from June to December. The results were as follows: (1) Oleic acid was the main oil component in the three avocado cultivars. The contents of crude fat in ‘HASS’ and ‘V4’ fruits increased continuously during the growth and development stages, and reached to the maximum on December, while V3 fruit increased continuously from June to October, but decreased in November and December. (2) All fruits of ‘HASS’, ‘V3’ and ‘V4’ contain 17 kinds of amino acids, including 7 essential (THR, MET, VAL, LEU, ILE, PHE, LYS) for human beings, 2 essential (ARG, HIS) for children, and 8 non-essential (PRO, TYR, CYS, ALA, GLY, GLU, SER, ASP) amino acids. The contents of 17 amino acids in ‘HASS’ and ‘V3’ fruits reached to the peak in November, while ‘V4’ fruits reached to the peak in October. (3) All the ‘HASS’, ‘V3’ and ‘V4’ fruits contain 9 mineral elements of P, K, Ca, Mg, Zn, Fe, Mn, Cu and Na. Among which, the contents of P, K, Zn, Fe and Na accumulated to the maximum in the later stages of growth (October to December), while the changes for the other four mineral elements were not obvious. (4) The variation of ash contents in the three cultivars of avocado was similar to that of the crude fat. It suggests that the three studied avocado cultivars, ‘HASS’, ‘V3’ and ‘V4’, have met the picking requirements since October and can be optimized the harvest time following fluctuations in demand.
Subjects: Biology >> Zoology submitted time 2018-12-25 Cooperative journals: 《动物营养学报》
Abstract：胃饥饿素（Ghrelin）又称作生长激素释放肽，作为脑肠肽，其可促进鱼类摄食。有研究报道禁食或摄食前可提高鱼类Ghrelin表达水平，中枢或外周注射Ghrelin可增加鱼类的摄食量。本文根据Ghrelin在哺乳动物和鱼类上的研究进展，阐述了Ghrelin结构、组织分布和对鱼类摄食的调控及相关机制，为今后鱼类摄食调控和生长的研究和生产实践提供理论依据。
Subjects: Biology >> Zoology submitted time 2018-12-24 Cooperative journals: 《动物营养学报》
Abstract：促皮质激素释放激素（CRF）作为中枢调控的厌食欲因子，可使鱼类产生饱腹感，进而减少鱼类摄食量和体重增长率。CRF大量分布于下丘脑，刺激垂体分泌促皮质激素（ACTH），进一步刺激皮质醇释放，抑制机体摄食和能量代谢。本文依据CRF在哺乳动物和部分鱼类中的研究进展，阐述了CRF的发现历史、分子结构、对鱼类摄食的调控作用及其机制，为今后鱼类摄食调控和生长的研究以及生产提供理论依据
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