Results 31 to 40 of about 594 (62)
Shuitu Baochi Xuebao, 2008 以22 a定位试验为基础,在黄土高原旱地研究了长期施用氮磷化肥,对不同种植体系土壤有效硫在剖面上分布与累积状况。结果表明,在60-80 cm土层各处理出现第一个累积峰,累积峰值为:玉米-小麦(2 a) 糜子轮作27.07 mg/kg,豌豆-小麦(2 a) 糜子轮作25.42 mg/kg,小麦(2 a) 糜子-玉米轮作24.23 mg/kg,豌豆-小麦(2 a) 玉米轮作22.61 mg/kg,小麦连作16.56 mg/kg,红豆草-小麦(2 a)轮作15.14 mg/kg;在120-180 ...
危锋, 郝明德
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Shuitu Baochi Xuebao, 2022 针对镉砷复合污染土壤中小麦籽粒重金属积累问题,采用生物模拟方法,以镉砷复合污染区土壤为研究对象,探究杏核生物炭(C1和C2分别表示3%和6%生物炭添加量)对复合污染土壤—小麦/玉米系统中镉砷累积和转运的影响。结果表明:添加生物炭(C1、C2)显著降低了小麦季根际/非根际土壤Cd、As有效性,并且小麦籽粒中Cd、As含量分别比CK平均降低19.25%和50.70%,但前者差异不显著。对玉米而言,生物炭C1、C2处理显著降低穗中Cd和As含量,降幅分别为85.67%,61.28%和98.36%,96.48%;
周昶 +5 more
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Ultrasound in Obstetrics &Gynecology, Volume 64, Issue 5, Page 661-668, November 2024.ABSTRACT Objective To determine the diagnostic accuracy of virtual autopsy using whole‐body postmortem ultra‐high field magnetic resonance imaging (MRI) at 7 Tesla (T), using a short T2‐weighted imaging (T2‐WI) protocol, compared with classical autopsy, for detecting structural abnormalities in small second‐trimester fetuses. Methods Thirty consecutive
A. Staicu +11 more
wiley +1 more source
Shuitu Baochi Xuebao, 2002 根据三工河流域试验小区1999～2000年冬小麦不同灌溉频次控制试验．研究了小麦耗水敏感期为拔节—灌浆期。探讨了干旱区小麦产量与灌水量之间的关系。提出了干旱区小麦返青水应采用“小水”灌溉的方式。同时通过对小区小麦成熟期灌水过程不同深度土壤水分含量的动态观测分析，提出小麦在成熟期对灌溉水分的消耗利用集中在0～30am土壤层内的观点。
赵成义 李国振 王玉潮 李洪庆
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Ultrasound in Obstetrics &Gynecology, Volume 64, Issue 4, Page 470-479, October 2024.ABSTRACT Objectives Our aim was to examine the prenatal profiles of pregnancies affected by an atypical chromosomal aberration, focusing on pathogenic copy‐number variants (pCNVs). We also wanted to quantify the performance of combined first‐trimester screening (cFTS) and a second‐trimester anomaly scan in detecting these aberrations. Finally, we aimed
K. Gadsbøll +6 more
wiley +1 more source
Shuitu Baochi Xuebao, 2003 研究了小麦生长期内土壤氮、钾与土壤过氧化氢酶(CAT)、脲酶(URE)、多酚氧化酶(PPO)活性变化及其相关性。结果表明,土壤速效氮(AN)、土壤速效钾(AK)和非交换性钾(NEK)含量随小麦生育进程呈现有规律的变化;土壤CAT、URE、PPO活性呈现先上升,但在拔节期到孕穗期出现峰值后逐渐下降,并渐趋平缓的变化规律。除小麦生长期内土壤AN、NEK与土壤PPO活性,小麦生长前、后期土壤NEK与URE活性,小麦生长后期AK与URE、PPO活性相关性不显著外,土壤AN、AK、NEK与土壤CAT、URE ...
熊明彪 田应兵 雷孝章 宋光煜 曹叔尤
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Conservation Biology, Volume 38, Issue 4, August 2024.Abstract Eradicating invasive predators from islands can result in substantial recovery of seabirds, but the mechanisms that drive population changes remain poorly understood. Meta‐analyses have recently revealed that immigration is surprisingly important to the recovery of philopatric seabirds, but it is not known whether dispersal and philopatry ...
Jeremy P. Bird +2 more
wiley +1 more source
Late sexual debut—A qualitative interview study
Sexuality, Gender &Policy, Volume 7, Issue 2, Page 177-195, May 2024.Abstract Many people find talking about their sexuality a taboo subject, especially if a person is unexperienced and has not had their sexual debut. In such cases, it is easy to feel stigmatized, isolated, and excluded from social groups and experience difficulties engaging in conversations.
Anne‐Katrine Hansen +1 more
wiley +1 more source
ZmELF6‐ZmPRR37 module regulates maize flowering and salt response
Plant Biotechnology Journal, Volume 22, Issue 4, Page 929-945, April 2024.Summary The control of flowering time in maize is crucial for reproductive success and yield, and it can be influenced by environmental stresses. Using the approaches of Ac/Ds transposon and transposable element amplicon sequencing techniques, we identified a Ds insertion mutant in the ZmPRR37 gene.
Huihui Su +18 more
wiley +1 more source
四川大学学报. 自然科学版, 2000 用小麦材料中国春连续回交硬粒小麦与中间偃麦草茸毛变种的杂种F1植株 ,并自交多代获得了一个农艺性状比较稳定的材料TE 3.根尖细胞有丝分裂观察表明TE 3群体中多数植株具有 2n =54～ 56条染色体 ,Giemsa C带分析发现了来源于偃麦草的 7对染色体 ,因而TE 3是一个小麦 偃麦草的部分双二倍体 ,花粉母细胞减数分裂中期I观察到大量的单价体和多价体 ,表明该双二倍体在细胞学上有待进一步稳定 .RAPD分析也证实了TE 3中的偃麦草遗传物质的存在 .由于TE 3具有对小麦多种病害的优良抗性 ...
杨足君, 刘登才, 李光蓉
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