我国冬油菜主产区土壤缺镁严重,为明确镁肥施用在油菜增产提质上的作用,于2020/2021和2021/2022油菜种植季在江西进贤和湖南安仁开展田间试验,共设置0、15、30、45和60 kg MgO hm^(–2)5个镁肥施用量。研究了镁肥用量对油菜籽产量及其...我国冬油菜主产区土壤缺镁严重,为明确镁肥施用在油菜增产提质上的作用,于2020/2021和2021/2022油菜种植季在江西进贤和湖南安仁开展田间试验,共设置0、15、30、45和60 kg MgO hm^(–2)5个镁肥施用量。研究了镁肥用量对油菜籽产量及其构成因子、籽粒镁含量、含油率和脂肪酸组成的影响。结果表明,施镁显著增加了油菜籽粒产量(增幅为12.0%-77.1%),当镁肥用量为21.4-45.6 kg MgO hm^(–2)时菜籽产量达到最高。与不施镁肥相比,施镁使油菜单株角果数、每角粒数和千粒重分别增加了5.0%-64.7%、1.8%-19.6%和7.1%-8.7%,但对收获密度影响不显著。施镁后籽粒镁含量增幅为5.0%-30.3%,含油率增加了0.63-5.11个百分点,蛋白质含量下降了1.45-2.34个百分点,籽粒含水率和硫甙含量则无明显变化。镁肥施用显著增加了单位面积籽粒产油量(14.4%-83.4%)和蛋白产量(9.8%-68.1%),当镁肥用量为30-45 MgO hm^(–2)时产油量达到最高。从脂肪酸组成来看,施镁对籽粒油酸含量和亚麻酸含量有提升作用,增幅分别为4.4%-16.0%和3.8%-40.8%,但降低了亚油酸含量,降幅为1.2%-10.1%,对其他脂肪酸组分的影响则较小。综上,施镁有利于提高油菜产量及其构成因子(单株角果数、每角粒数、千粒重)、籽粒含油量及不饱和脂肪酸含量,实现产量和品质的协同提升。当镁肥用量为30-45 MgO hm^(–2)时产量与产油量均达到较高水平。展开更多
The present report evaluates the effects of formaldehyde (FA) exposure on peripheral lymphocytes by using heth genetic and immunological parameters. Twenty-three non-smoking students in the study had inhalation exposu...The present report evaluates the effects of formaldehyde (FA) exposure on peripheral lymphocytes by using heth genetic and immunological parameters. Twenty-three non-smoking students in the study had inhalation exposure to 0.508 ±0. 299 mg/m3 of FA for a Period of 8 weeks (3h × 3 times each week) during anatomy classes. As for composition of lymphocyte subsets after FA exposare,significant increase was found in the percentage of CD19(B cells), while sighficant decrease was observed in CD3(total T cells), CD4(T helper-inducer cells), and CD8(T cytotoxic-suppressior cells) with a P<0 .01. Increase in the ratio of T-helper-inducer cells to T-cytotoxic-suppressor cells (T4 / T8) was also observed with statistical sighcance after exposure (P < 0.001). In the meanwhile,no significant difference (P > 0 .05) was reported between lymphocyte prolifendion rate and sisterchromatid exchange (SCE) at the exposure level and duration. It is suggested that the lymphocyte subsets may be most susceptible to the effects of FA, though a single immunological endpoint is rarely related with pathophysiological interpretation.展开更多
The frequency of micronuclei (MN) in cells of the nasal mucosa, oral mucosa and in lym-phocytes was evaluated for 25 students in anatomy classes exposed to formaldehyde (FA) overan 8-week period. Each student served a...The frequency of micronuclei (MN) in cells of the nasal mucosa, oral mucosa and in lym-phocytes was evaluated for 25 students in anatomy classes exposed to formaldehyde (FA) overan 8-week period. Each student served as his or her own control. The time-weighted averageconcentration (TWA) of fOrmaldehyde in anatomical laboratories and in students' dormitorieswas 0. 508 ± 0. 299 mg/m3 and 0. 012 ± 0. 0025mg/m3, respectively. A higher frequency ofmicronuclei was observed in nasal and oral exfoliative cells after formaldehyde exposure (3. 85± 1. 48 vs 1 .20± 0. 676 and 0. 857 ± 0. 558 vs 0. 568 ± 0. 317, paired-t test: P< 0. 001and P < 0. 01, respectively). No significant increase in the frequency of lymphocyte micronu-clei was found after formaldehyde exposure (P >0. 05 ). The present study shows that nasalmucosa cel1s exposed through respiration are the chief target of FA-induced genotoxic effects展开更多
文摘The present report evaluates the effects of formaldehyde (FA) exposure on peripheral lymphocytes by using heth genetic and immunological parameters. Twenty-three non-smoking students in the study had inhalation exposure to 0.508 ±0. 299 mg/m3 of FA for a Period of 8 weeks (3h × 3 times each week) during anatomy classes. As for composition of lymphocyte subsets after FA exposare,significant increase was found in the percentage of CD19(B cells), while sighficant decrease was observed in CD3(total T cells), CD4(T helper-inducer cells), and CD8(T cytotoxic-suppressior cells) with a P<0 .01. Increase in the ratio of T-helper-inducer cells to T-cytotoxic-suppressor cells (T4 / T8) was also observed with statistical sighcance after exposure (P < 0.001). In the meanwhile,no significant difference (P > 0 .05) was reported between lymphocyte prolifendion rate and sisterchromatid exchange (SCE) at the exposure level and duration. It is suggested that the lymphocyte subsets may be most susceptible to the effects of FA, though a single immunological endpoint is rarely related with pathophysiological interpretation.
文摘The frequency of micronuclei (MN) in cells of the nasal mucosa, oral mucosa and in lym-phocytes was evaluated for 25 students in anatomy classes exposed to formaldehyde (FA) overan 8-week period. Each student served as his or her own control. The time-weighted averageconcentration (TWA) of fOrmaldehyde in anatomical laboratories and in students' dormitorieswas 0. 508 ± 0. 299 mg/m3 and 0. 012 ± 0. 0025mg/m3, respectively. A higher frequency ofmicronuclei was observed in nasal and oral exfoliative cells after formaldehyde exposure (3. 85± 1. 48 vs 1 .20± 0. 676 and 0. 857 ± 0. 558 vs 0. 568 ± 0. 317, paired-t test: P< 0. 001and P < 0. 01, respectively). No significant increase in the frequency of lymphocyte micronu-clei was found after formaldehyde exposure (P >0. 05 ). The present study shows that nasalmucosa cel1s exposed through respiration are the chief target of FA-induced genotoxic effects
