sugar

  • 文章类型: Journal Article
    考虑到商业决定因素对糖消费和健康的作用,这项研究旨在描述2014年至2022年间智利超加工含糖食品和饮料行业的游说行为.
    超加工含糖食品和饮料行业与相关商业行为者和智利政府官员之间的正式会议是从智利大厅登记处获得的。相关商业名称最初是根据其市场份额确定的,并根据相关会议的信息反复扩展。定性分析遵循演绎归纳的方法,使用公司政治活动模型来识别和分类目标,框架和行动策略。
    从确定的237条记录中,卫生部,社会发展,和经济是最经常游说的。行业代表通过针对各种当局寻求实现其短期和长期目标,包括部长和副部长,使用不同的策略。框架策略的重点是将含糖食品和饮料行业视为对社会负责和合法的政策参与者,并批评公共卫生举措为“不良解决方案”。旨在影响政策制定和培养公司声誉的行动策略。
    在2014年至2022年期间,含糖食品和饮料行业进行了广泛的游说,这一时期智利正在讨论主要的公共卫生政策。游说策略多种多样,以实现行业目标,并针对包括高级官员在内的各种政府机构。迫切需要更严格的法规,以制止公共卫生政策制定中不适当的行业影响。
    国家研究机构(智利)-博士奖学金。伦敦大学学院-开放获取费用。
    UNASSIGNED: Given the role of commercial determinants on sugar consumption and health, this study aimed to describe lobbying practices of the ultra-processed sugary food and drinks industries in Chile between 2014 and 2022.
    UNASSIGNED: Official meetings between ultra-processed sugary food and drinks industries and related commercial actors and Chilean government officials were obtained from the Chilean Lobby Registry. Relevant commercial names were initially identified based on their market share and expanded iteratively based on information from relevant meetings. Qualitative analysis followed a deductive-inductive approach using the Corporate Political Activity Model to identify and classify objectives, framing and action strategies.
    UNASSIGNED: From 237 records identified, the Ministries of Health, Social Development, and Economy were the most frequently lobbied. Industry representatives sought to achieve their short- and long-term objectives by targeting a diverse range of authorities, including Ministers and Under-secretaries, using different strategies. Framing strategies focused on presenting sugary food and drinks industries as socially responsible and legitimate policy actors and criticised public health initiatives as \'bad solutions\'. Action strategies aimed to influence policymaking and nurture corporate reputations.
    UNASSIGNED: Extensive lobbying took place by the sugary food and drinks industries between 2014 and 2022, a period when major public health policies were being discussed in Chile. Lobbying strategies varied to meet industry objectives and targeted a diverse range of government institutions including high-ranking officials. Tighter regulations to stop inappropriate industry influence in public health policymaking are urgently required.
    UNASSIGNED: Agencia Nacional de Investigación y Desarrollo (Chile)-PhD Scholarship. University College London-Open Access fees.
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  • 文章类型: Journal Article
    背景:糖原贮积病Ia型(GSD-Ia)是最常见的肝脏GSD之一。它的治疗主要包括饮食,包括大量摄入慢消化的碳水化合物,如生玉米淀粉和限制单糖。这能够维持血糖正常并防止继发性代谢紊乱。淀粉是由直链淀粉和支链淀粉形成的葡萄糖聚合物,可以从不同的来源获得。尽管未煮熟的玉米淀粉已成功用于GSD-Ia的治疗,它可以导致高血糖和体重增加。体外和体内试验表明,甜甘露聚糖淀粉可潜在地用于治疗GSD-Ia。
    结果:水分分析显示,甜木薯淀粉样品的变化为10.3%至12.8%,而未煮熟的玉米淀粉的水分含量为7.3%至11.1%。在3/5的甜木薯淀粉样品和1/3的未煮熟的玉米淀粉样品中检测到可定量的糖。值得注意的是,这种未煮熟的玉米淀粉品牌在巴西广泛用于GSD-Ia治疗。产物B和E具有较高的支链淀粉值和不可检测的糖水平。有必要进行临床试验以比较样品F和G,并确定相同饮食来源的淀粉中糖痕量的影响。
    结论:总的来说,结果表明,除了传统的未煮熟的玉米淀粉外,GSD-Ia可能的治疗替代方案。
    BACKGROUND: Glycogen storage disease type Ia (GSD-Ia) is one of the most common hepatic GSD. Its treatment mainly consists of a diet including a high intake of slow-digestion carbohydrates such as raw cornstarch and the restriction of simple sugars. This enables the maintenance of euglycemia and prevents secondary metabolic disorders. Starch is a glucose polymer formed by amylose and amylopectin, which can be obtained from distinct sources. Although uncooked cornstarch has been successfully used in the treatment of GSD-Ia, it can lead to hyperglycemia and weight gain. in vitro andin vivo tests indicated that sweet manioc starch can be potentially used in the treatment of GSD-Ia.
    RESULTS: The moisture analysis revealed a variation from 10.3 to 12.8% in the sweet manioc starch samples, whereas the moisture content of uncooked cornstarch ranged from 7.3 to 11.1%. Quantifiable sugar was detected in 3/5 samples of sweet manioc starch and 1/3 samples of uncooked cornstarch. Notably, this uncooked cornstarch brand is widely employed in GSD-Ia treatment in Brazil. Products B and E had higher values of amylopectin and undetectable levels of sugars. A clinical trial is warranted to compare samples F and G and determine the impact of sugar trace in the same dietary source of starch.
    CONCLUSIONS: Collectively, the results demonstrated possible therapeutic alternatives for GSD-Ia in addition to traditional uncooked cornstarch.
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  • 文章类型: Journal Article
    过量的膳食糖摄入会增加不健康体重增加的风险,儿童心血管代谢的一个重要危险因素。为了加深我们对这种关系的理解,我们使用两种方法进行了叙述性审查。首先,研究检查膳食糖摄入量,它与心脏代谢健康的关联,遗传学对甜味感知和摄入的影响,综述了遗传学如何调节1.5-5岁学龄前儿童的膳食糖摄入和心脏代谢危险因素之间的关联。第二,收集和分析饮食中糖摄入量的方法学考虑因素,遗传信息,并提供幼儿心脏代谢健康的标记。我们对研究人员的主要建议包括:(1)关于糖摄入量和心脏代谢风险因素的进一步纵向研究是必要的,为学龄前儿童健康饮食的政策决定和指南提供信息。(2)在整个研究中需要糖定义的一致性,以帮助比较结果。(3)选择特定于每个研究的目的和糖定义的饮食收集工具。(4)限制饮食评估工具的主观性,因为这会影响研究结果的解释。(5)选择心脏代谢疾病的非侵入性生物标志物,直到澄清学龄前儿童可用生物标志物的优势和局限性。(6)选择考虑心脏代谢疾病的多基因性质的方法,例如基因组风险评分和全基因组关联研究,以评估遗传学如何调节饮食糖摄入量与心脏代谢风险之间的关系。这篇综述强调了潜在的建议,这些建议将支持研究环境,以帮助告知政策决策和健康饮食政策,以降低幼儿的心脏代谢风险。
    Excess dietary sugar intake increases the risk of unhealthy weight gain, an important cardiometabolic risk factor in children. To further our understanding of this relationship, we performed a narrative review using two approaches. First, research examining dietary sugar intake, its associations with cardiometabolic health, impact of genetics on sweet taste perception and intake, and how genetics moderates the association of dietary sugar intake and cardiometabolic risk factors in preschool-aged children 1.5-5 years old is reviewed. Second, methodological considerations for collecting and analyzing dietary intake of sugar, genetic information, and markers of cardiometabolic health among young children are provided. Our key recommendations include the following for researchers: (1) Further longitudinal research on sugar intake and cardiometabolic risk factors is warranted to inform policy decisions and guidelines for healthy eating in preschool-aged children. (2) Consistency in sugar definitions is needed across research studies to aid with comparisons of results. (3) Select dietary collection tools specific to each study\'s aim and sugar definition(s). (4) Limit subjectivity of dietary assessment tools as this impacts interpretation of study results. (5) Choose non-invasive biomarkers of cardiometabolic disease until the strengths and limitations of available biomarkers in preschool-aged children are clarified. (6) Select approaches that account for the polygenic nature of cardiometabolic disease such as genome risk scores and genome wide association studies to assess how genetics moderates the relationship between dietary sugar intake and cardiometabolic risk. This review highlights potential recommendations that will support a research environment to help inform policy decisions and healthy eating policies to reduce cardiometabolic risk in young children.
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  • 文章类型: Journal Article
    迄今为止,动脉粥样硬化发展的风险已经超出了西方国家,现在已经影响到来自不同种族和年龄组的个体.动脉粥样硬化的传统危险因素,如高胆固醇血症,由于在降低血浆胆固醇水平方面高效且廉价的疗法,因此比以前得到了更好的控制。然而,降低膳食胆固醇摄入量的作用,作为一项公共健康战略,在预防心血管死亡率的发生方面最近受到了挑战。的确,尽管在过去的50年里,我们的饮食胆固醇摄入量持续下降,心血管死亡率的发病率持续上升,因此增加了其他饮食因素的可能性,比如含果糖的糖,是罪魁祸首。在1970年代,约翰·尤德金首先提出,糖是大多数心血管死亡率的主要饮食因素,然而他的假设被驳回了。然而,在过去的25年里,已经积累了大量的科学证据来支持Yudkin的假设。这篇综述的目的是通过回顾他的假设并总结我们对果糖代谢的理解的最新进展,强调尤德金对营养科学的重大贡献。果糖代谢的代谢后果,如果糖诱导的尿酸血症,胰岛素抵抗,脂蛋白过度产生和慢性炎症,以及它们如何与动脉粥样硬化相关的危险因素将被讨论。最后,该审查将探讨值得未来研究的领域,并提出我们在设计未来研究时需要评估的重要考虑因素。
    To date, the risk of developing atherosclerosis has extended beyond Western countries and now affecting individuals from various ethnic backgrounds and age groups. Traditional risk factors of atherosclerosis, such as hypercholesterolemia, has been better controlled than before due to highly effective and inexpensive therapies at lowering plasma cholesterol levels. However, the role of reducing dietary cholesterol intake, as a public healthy strategy, in preventing the occurrence of cardiovascular mortalities has been recently challenged. Indeed, despite our continuous decline of dietary cholesterol intake within the last 50 years, the incidence of cardiovascular mortalities has continued to rise, thus raising the possibility that other dietary factors, such as fructose-containing sugars, are the major culprit. In the 1970s, John Yudkin first proposed that sugar was the predominant dietary factor that underlies the majority of cardiovascular mortalities, yet his hypothesis was dismissed. However, over the last 25 years substantial scientific evidence has been accumulated to support Yudkin\'s hypothesis. The objectives of this review are to highlight Yudkin\'s significant contribution to nutritional science by reviewing his hypothesis and summarizing the recent advances in our understanding of fructose metabolism. The metabolic consequences of fructose metabolism, such as fructose-induced uricemia, insulin resistance, lipoprotein hyperproduction and chronic inflammation, and how they are linked to atherosclerosis as risk factors will be discussed. Finally, the review will explore areas that warrant future research and raise important considerations that we need to evaluate when designing future studies.
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  • 文章类型: Journal Article
    糖的口服检测依赖于两种类型的受体系统。第一个是G蛋白偶联受体TAS1R2/TAS1R3。激活时,这个受体触发了一个下游的信号级联反应,磷脂酶Cβ2(PLCβ2),和瞬时受体电位通道M5(TRPM5)。第二种类型的受体是葡萄糖转运蛋白。当葡萄糖通过这种转运蛋白进入细胞时,代谢产生ATP。这种ATP抑制KATP通道的开放,导致细胞去极化。除了这些受体系统,对甜味敏感的味觉细胞具有基于身体内部和外部状态调节其对甜味物质的敏感性的机制。甜味受体不限于口腔;它们也存在于口腔外器官,如胃肠道,胰腺,和大脑。这些口外甜味受体参与各种功能,包括葡萄糖吸收,胰岛素释放,糖偏好,和食物摄入,有助于维持能量稳态。此外,甜味受体可能在某些器官如气管和骨骼中具有独特的作用。这篇综述总结了过去和最近对甜味受体系统的研究,探索口腔和口外器官中甜味(糖)检测的分子机制和生理功能。
    The oral detection of sugars relies on two types of receptor systems. The first is the G-protein-coupled receptor TAS1R2/TAS1R3. When activated, this receptor triggers a downstream signaling cascade involving gustducin, phospholipase Cβ2 (PLCβ2), and transient receptor potential channel M5 (TRPM5). The second type of receptor is the glucose transporter. When glucose enters the cell via this transporter, it is metabolized to produce ATP. This ATP inhibits the opening of KATP channels, leading to cell depolarization. Beside these receptor systems, sweet-sensitive taste cells have mechanisms to regulate their sensitivity to sweet substances based on internal and external states of the body. Sweet taste receptors are not limited to the oral cavity; they are also present in extraoral organs such as the gastrointestinal tract, pancreas, and brain. These extraoral sweet receptors are involved in various functions, including glucose absorption, insulin release, sugar preference, and food intake, contributing to the maintenance of energy homeostasis. Additionally, sweet receptors may have unique roles in certain organs like the trachea and bone. This review summarizes past and recent studies on sweet receptor systems, exploring the molecular mechanisms and physiological functions of sweet (sugar) detection in both oral and extraoral organs.
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  • 文章类型: Journal Article
    背景:香脆或油炸小吃(SCFS),含糖零食(SS),和含糖饮料(SSB)的消费与肥胖和非传染性疾病的患病率较高有关。所以,我们估计了SCFS的消耗量,SS,孟加拉国老年男性和女性的SSB。我们还使用来自全国横断面研究的数据报告了与他们消费相关的因素。
    方法:我们采访了2,482(51.52%)老年男性和2,335(48.47%)老年女性,以回忆过去7天的SCFS摄入量,SS,和SSB来自农村随机选择的82个集群,非贫民窟城市,和孟加拉国的贫民窟地区。还收集了社会人口统计学和人体测量学数据。
    结果:SCFS的消耗,SS,884例(31.5%)报告每周SSB≥1次,1,696(66.1%),和1,911(69.3%)的老年男性和516(20.1%),1367(53.9%),和1171名(34.1%)老年女性,分别。贫民窟和非贫民窟城市地区的老年男性和女性都比农村地区消耗更多的SSB。较高的电视收视水平与SCFS摄入频率增加有关,SS,老年男性的SSB和老年女性的SSB摄入量。营养状况与老年人对这些食物和饮料的消费无关;然而,超重男性消耗SSB的频率较低。
    结论:在孟加拉国,老年男性和女性经常食用不健康的零食和饮料。考虑到它们对健康的有害影响,有必要通过政策和计划措施减少他们的消费,并推广更健康的食品和饮料。
    BACKGROUND: Savory crispy or fried snack (SCFS), sugary snack (SS), and sugar-sweetened beverage (SSB) consumption are associated with a higher prevalence of obesity and non-communicable diseases. So, we estimated the consumption of SCFS, SS, and SSB among elderly males and females in Bangladesh. We also reported the factors associated with their consumption using data from a nationwide cross-sectional study.
    METHODS: We interviewed 2,482 (51.52%) elderly males and 2,335 (48.47%) elderly females for the recall for the past seven days on the intake of SCFS, SS, and SSB from 82 randomly selected clusters from rural, non-slum urban, and slum areas in Bangladesh. Sociodemographic and anthropometry data were also collected.
    RESULTS: Consumption of SCFS, SS, and SSB for ≥1 time per week was reported by 884 (31.5%), 1,696 (66.1%), and 1,911 (69.3%) of the elderly males and 516 (20.1%), 1,367 (53.9%), and 1,171 (34.1%) of the elderly females, respectively. Both elderly males and females from slum and non-slum urban areas consumed more SSB than their rural counterparts. Higher level of television viewing was associated with increased frequency of intake of SCFS, SS, and SSB among elderly males and SSB intake among elderly females. Nutritional status was not associated with the consumption of these foods and drinks among the elderly; however, overweight males consumed SSB less frequently.
    CONCLUSIONS: In Bangladesh, elderly males and females frequently consume unhealthy snacks and drinks. Considering their detrimental effect on health, it is necessary to reduce their consumption through policy and program measures and promote healthier foods and beverages.
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  • 文章类型: Journal Article
    甘蔗是糖和乙醇生产的中心作物。投资于可持续做法可以提高生产力,技术质量,减轻影响,并为更清洁的能源未来做出贡献。在有助于提高甘蔗生产力的因素中,物理,土壤的化学和生物参数是最重要的。利用家禽凋落物已成为改良土壤的重要替代方法,因为它充当土壤调理剂。因此,这项工作旨在验证植物人的家禽垃圾的最佳剂量,甘蔗的生殖和技术组成部分。该实验是在Jandaia市的UsinaDenusaDestilariaNovaUniãoS/A进行的,走吧。所使用的实验设计是完全随机区组设计,具有四个重复:5×4,总共20个实验单元。评价因子包括四个剂量的家禽垫料加上对照(0(对照),2、4、6和8tha-1)。在这项研究中,评估了耕种器的数量,下部阀杆直径,平均茎直径,上部阀杆直径,植物高度,茎的重量和生产率。总可回收糖的技术变量,可回收糖,白利糖度,纤维,还评估了寡糖的纯度和百分比。它被观察到,在这个实验的条件下,在大多数生物识别中,家禽垃圾的插入并没有显着干扰,甘蔗的生产和技术变量。但也可以推断,当甘蔗用4tha-1的家禽凋落物种植时,有更好的结果的统计趋势。
    Sugarcane is a central crop for sugar and ethanol production. Investing in sustainable practices can enhance productivity, technological quality, mitigate impacts, and contribute to a cleaner energy future. Among the factors that help increase the productivity of sugarcane, the physical, chemical and biological parameters of the soil are amongst the most important. The use of poultry litter has been an important alternative for soil improvement, as it acts as a soil conditioner. Therefore, this work aimed to verify the best doses of poultry litter for the vegetative, reproductive and technological components of sugarcane. The experiment was carried out at Usina Denusa Destilaria Nova União S/A in the municipality of Jandaia, GO. The experimental design used was a complete randomized block design with four replications: 5 × 4, totaling 20 experimental units. The evaluated factor consisted of four doses of poultry litter plus the control (0 (control), 2, 4, 6 and 8 t ha-1). In this study, were evaluated the number of tillers, lower stem diameter, average stem diameter, upper stem diameter, plant height, stem weight and productivity. The technological variables of total recoverable sugar, recoverable sugar, Brix, fiber, purity and percentage of oligosaccharides were also evaluated. It was observed, within the conditions of this experiment, that the insertion of poultry litter did not interfere significantly in most biometric, productive and technological variables of the sugarcane. But it can also be inferred that there was a statistical trend toward better results when the sugarcane was cultivated with 4 t ha-1 of poultry litter.
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  • 文章类型: Journal Article
    背景:在寻找特应性皮炎(AD)安全有效的治疗方法的不断努力中,饮食调整仍然相当关注。然而,研究的可获得性有限和学术文献中相互矛盾的发现构成了建立结论性建议的障碍。
    方法:将孟德尔随机化(MR)应用于有关茶摄入量的最全面的全基因组关联研究(GWAS)数据(447.485),绿茶摄入量(n=64.949),调味牛奶摄入量(n=64.941),从来不吃鸡蛋,乳制品,小麦,糖:小麦产品(n=461.046),从来不吃鸡蛋,乳制品,小麦,糖:糖或含糖的食物/饮料(n=461.046),从来不吃鸡蛋,乳制品,小麦,糖:我吃所有上述(n=461.046)和特应性皮炎(n=218.467)。我们使用逆方差加权法(IVW)作为主要方法。
    结果:IVW分析表明,茶摄入量增加与AD风险降低相关(比值比[OR]:0.646,95%置信区间[CI]:0.430-0.968,p=0.034)。此外,在IVW模型中,绿茶摄入量与AD显着负相关(IVWOR:0.986,95%CI:0.975-0.998;p=0.024)。从不食用小麦产品可以降低AD风险(IVWOR:8.243E-04,95%CI:7.223E-06-9.408E-02,p=0.003)。从不吃鸡蛋之间没有联系,乳制品,小麦,糖:糖,或含糖的食物/饮料,我吃了所有上述和AD。
    结论:我们的MR研究表明茶摄入量之间存在因果关系,绿茶摄入量,避免食用患有特应性皮炎的小麦产品。我们的研究结果表明,预防和管理特应性皮炎可以通过从不食用小麦产品同时增加茶和绿茶的摄入量来实现。
    BACKGROUND: In the continuous endeavor to find safe and efficient treatments for Atopic Dermatitis (AD), there remains a considerable focus on dietary adjustments. Nevertheless, the limited availability of research and conflicting findings in the academic literature pose a hurdle in establishing conclusive recommendations.
    METHODS: Mendelian randomization (MR) was applied to the most comprehensive genome-wide association studies (GWAS) data on tea intake (447 485), green tea intake (n = 64 949), flavored milk intake (n = 64 941), never eat eggs, dairy, wheat, sugar: Wheat products(n = 461 046), never eat eggs, dairy, wheat, sugar: Sugar or foods/drinks containing sugar (n = 461 046), never eat eggs, dairy, wheat, sugar: I eat all of the above (n = 461 046) and atopic dermatitis (n = 218 467). We used the inverse-variance weighted method (IVW) as the primary method.
    RESULTS: The IVW analyses have demonstrated an increased tea intake was genetically associated with a reduced risk of AD (odds ratio [OR]: 0.646, 95% confidence interval [CI]: 0.430-0.968, p = 0.034). Furthermore, green tea intake was significantly negatively associated with AD (IVW OR: 0.986, 95% CI: 0.975-0.998; p = 0.024) in the IVW model. AD risk could be reduced by never eating wheat products (IVW OR: 8.243E-04, 95% CI: 7.223E-06-9.408E-02, p = 0.003). There was no association between never eating eggs, dairy, wheat, sugar: Sugar, or foods/drinks containing sugar, I eat all of the above and AD.
    CONCLUSIONS: Our MR study suggests a causal relationship between tea intake, green tea intake, and the avoidance of eating wheat products with atopic dermatitis. Our findings recommend that preventing and managing atopic dermatitis may be achieved by never eating wheat products while increasing tea and green tea intake.
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  • 文章类型: Journal Article
    芦笋是一种营养丰富的茎类蔬菜,其生长发育与其品质和产量相关。研究芦笋茎伸长和生长过程中的动态变化及其潜在机制。我们使用生理和转录组分析记录了芦笋的生长模式,并从四个连续的伸长阶段选择了茎段。值得注意的是,25厘米长的芦笋生长速度加快。蔗糖浓度显著降低,果糖,葡萄糖,在嫩茎的伸长区域观察到额外的糖。相反,生长素和赤霉素(GA)的水平随着参与蔗糖降解的酶活性的增加而升高。生长素之间存在显著的正相关,GAs,和参与蔗糖降解的酶。ABA含量随茎伸长而逐步增长。组织切片显示细胞伸长是茎伸长的固有表现。通过转录组分析筛选的差异基因在淀粉和蔗糖代谢等途径进行富集,植物激素合成代谢,和信号转导。ARF等基因的表达水平,GA20ox,NCED,在茎伸长过程中,PIF4和其他蛋白上调,而DAO,GA2ox,和其他基因下调。基因表达水平与激素含量的变化一致,并影响细胞长度伸长。此外,RT-qPCR表达结果与RNA-seq一致。观察到的基因表达水平的变化,芦笋嫩茎伸长和生长过程中内源激素和糖的变化为今后研究芦笋茎生长发育的分子机制提供了有价值的见解,为栽培和生产实践提供了理论基础。
    Asparagus is a nutritionally dense stem vegetable whose growth and development are correlated with its quality and yield. To investigate the dynamic changes and underlying mechanisms during the elongation and growth process of asparagus stems, we documented the growth pattern of asparagus and selected stem segments from four consecutive elongation stages using physiological and transcriptome analyses. Notably, the growth rate of asparagus accelerated at a length of 25 cm. A significant decrease in the concentration of sucrose, fructose, glucose, and additional sugars was observed in the elongation region of tender stems. Conversely, the levels of auxin and gibberellins(GAs) were elevated along with increased activity of enzymes involved in sucrose degradation. A significant positive correlation existed between auxin, GAs, and enzymes involved in sucrose degradation. The ABA content gradually increased with stem elongation. The tissue section showed that cell elongation is an inherent manifestation of stem elongation. The differential genes screened by transcriptome analysis were enriched in pathways such as starch and sucrose metabolism, phytohormone synthesis metabolism, and signal transduction. The expression levels of genes such as ARF, GA20ox, NCED, PIF4, and otherswere upregulated during stem elongation, while DAO, GA2ox, and other genes were downregulated. The gene expression level was consistent with changes in hormone content and influenced the cell length elongation. Additionally, the expression results of RT-qPCR were consistent with RNA-seq. The observed variations in gene expression levels, endogenous hormones and sugar changes during the elongation and growth of asparagus tender stems offer valuable insights for future investigations into the molecular mechanisms of asparagus stem growth and development and provide a theoretical foundation for cultivation and production practices.
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  • 文章类型: Journal Article
    已对15种不同种类和来源的糖样品进行了1H快速场循环和时域核磁共振弛豫测定研究(棕色,白色,甘蔗,甜菜糖)。广泛的数据集,包括结晶糖和糖/水混合物的结果,已经被彻底分析了,重点是确定与系统的固体和液体部分以及松弛过程的非指数性相关的松弛贡献。已经观察到,晶体糖(固体)的1H自旋晶格弛豫速率在0.45s-1和0.59s-1之间变化,并且弛豫过程仅显示出与指数性的小偏差(已提供了指数性的定量度量)。糖/水混合物的1H自旋晶格弛豫过程已被证明是双指数的,弛豫率在约13s-1-17s-1(对于较快的组件)和约2.1s-1-3.5s-1(对于较慢的组件)之间变化,松弛贡献的振幅之间的比率在2.8和4.2之间。参数变化的狭窄范围使其成为糖的质量和真实性的有希望的标记。
    1H fast field-cycling and time-domain nuclear magnetic resonance relaxometry studies have been performed for 15 samples of sugar of different kinds and origins (brown, white, cane, beet sugar). The extensive data set, including results for crystal sugar and sugar/water mixtures, has been thoroughly analyzed, with a focus on identifying relaxation contributions associated with the solid and liquid fractions of the systems and non-exponentiality of the relaxation processes. It has been observed that 1H spin-lattice relaxation rates for crystal sugar (solid) vary between 0.45 s-1 and 0.59 s-1, and the relaxation process shows only small deviations from exponentiality (a quantitative measure of the exponentiality has been provided). The 1H spin-lattice relaxation process for sugar/water mixtures has turned out to be bi-exponential, with the relaxation rates varying between about 13 s-1-17 s-1 (for the faster component) and about 2.1 s-1-3.5 s-1 (for the slower component), with the ratio between the amplitudes of the relaxation contributions ranging between 2.8 and 4.2. The narrow ranges in which the parameters vary make them a promising marker of the quality and authenticity of sugar.
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