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Radioactivity: Radon Gas, its Properties and the Risks of Increasing its Concentration 放射性:氡气,其性质和增加其浓度的风险
Pub Date : 2021-01-01 DOI: 10.35248/2161-0398.21.11.294
E. Salman, Amenah Kadhim Murad
The adverse health effects of exposure to radon are caused primarily by damage due to alpha-particles. The possible effects will depend on exposure level. The main danger from high radon exposure is an increased risk of lung cancer. Radon as a noble gas is rapidly exhaled after being breathed in; however, radon progeny combine with other molecules in the air and with particles of dust, aerosols or smoke, and readily deposit in the airways of the lung. While lodging there, the progeny emit ionizing radiation in the form of alpha particles, which can damage the cells lining the airways. Experiments have confirmed that ionizing radiation affecting bronchial epithelial cells could cause cancer.
接触氡对健康的不利影响主要是由α粒子造成的损害造成的。可能产生的影响取决于暴露程度。高氡暴露的主要危险是增加患肺癌的风险。氡是一种惰性气体,吸入后迅速呼出;然而,氡的子代与空气中的其他分子以及灰尘、气溶胶或烟雾颗粒结合,很容易沉积在肺部的气道中。在那里,它们的后代会以α粒子的形式释放电离辐射,这种辐射会损害气道内壁的细胞。实验证实,电离辐射影响支气管上皮细胞可导致癌症。
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引用次数: 0
Biomaterials in the Field of Dental Implantation 生物材料在牙种植领域的应用
Pub Date : 2021-01-01 DOI: 10.35248/2161-0398.21.11.302
C. Ribeiro
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引用次数: 0
Antioxidant and its Adverse Effects 抗氧化剂及其副作用
Pub Date : 2021-01-01 DOI: 10.35248/2161-0398.21.11.296
Bello Warren
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引用次数: 0
Using Demarcation Criteria as a Tool for Evaluating Controversial Case of andldquo;Water Memoryandrdquo; 以划界标准为工具评价水资源记忆争议案件
Pub Date : 2021-01-01 DOI: 10.35248/2161-0398.21.11.295
E. Rezazadeh, Iman Rad
Definition of biological activity, which results in a biological property, is still inspired by conventional Fischer’s ‘lock- and-key’ model. This model explains how the correctly sized key (ligand) should fits into the keyhole (receptor) in an analogical manner. During Electromagnetic Information Transfer (EMIT), property of original molecule delivers either to water or target biological entity. In cases that water receives a property via EMIT, it imitates the original agonist, while no longer has the molecule inside it. The recent concept is known as “Water Memory (WM)”. EMIT and WM, challenge the currently admired scientific paradigm (lock-and-key model), which addresses the necessity of structural conformity of interacting molecules. Considering the fact that replicability of EMIT and WM related empirical studies are not always confirmed, these propositions are mostly labelled as “pseudoscience”. To evaluate the authenticity of labelling EMIT and WM as pseudoscience, we debated the scientific accuracy of EMIT phenomenon with demarcation criteria. Either of the agreement or disagreements of the proposed propositions, which explain EMIT and WM, evaluated and scored by Delphi analysis. Results of our Delphi analysis confirm that some of the propositions that explain EMIT or WM, splendidly pass the prerequisites of demarcation criteria. Therefore, labelling the aforementioned propositions as pseudoscience is content to perfunctory generalization, which needs to be revised. Further investigation of the propositions that merited demarcation criteria, helps to establish a scientific framework that explains ground-breaking aspects of EMIT and WM phenomena.
生物活性的定义,即生物特性的产生,仍然受到传统费舍尔的“锁与钥匙”模型的启发。这个模型以类比的方式解释了正确大小的钥匙(配体)应该如何适应钥匙孔(受体)。在电磁信息传递(EMIT)过程中,原始分子的特性传递给水或目标生物实体。如果水通过EMIT获得一种特性,它会模仿原来的激动剂,而不再有分子在里面。最近的概念被称为“水记忆(WM)”。EMIT和WM挑战了目前备受推崇的科学范式(锁与钥匙模型),该模型解决了相互作用分子结构一致性的必要性。考虑到EMIT和WM相关实证研究的可重复性并不总是得到证实,这些主张大多被贴上“伪科学”的标签。为了评估将EMIT和WM标记为伪科学的真实性,我们用划分标准讨论了EMIT现象的科学准确性。提出的命题的一致或不一致,这解释了EMIT和WM,通过德尔菲分析进行评估和评分。我们的德尔菲分析结果证实,一些解释EMIT或WM的命题,很好地通过了划分标准的先决条件。因此,将上述命题贴上伪科学的标签是满足于敷衍的概括,需要修正。对符合划界标准的命题的进一步调查,有助于建立一个科学框架,解释EMIT和WM现象的突破性方面。
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引用次数: 0
The Practice of Preoperative Antibiotic Prophylaxis and the Adherence to ASHP Guideline in Different Hospitals in Riyadh 利雅得不同医院术前抗生素预防的实践和对ASHP指南的遵守
Pub Date : 2020-01-01 DOI: 10.35248/2161-0401.20.10.282
F. Alotaibi
Appropriately administered antibiotic prophylaxis reduces the incidence of surgical wound infection. Prophylaxis is uniformly recommended for all clean-contaminated, contaminated and dirty procedures. It is considered optional for most clean procedures, although it may be indicated for certain patients and clean procedures that fulfill specific risk criteria.
适当给予抗生素预防可减少手术伤口感染的发生率。建议对所有清洁污染、污染和肮脏的程序进行预防。对于大多数清洁手术来说,它被认为是可选的,尽管它可能适用于某些患者和符合特定风险标准的清洁手术。
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引用次数: 0
Improving Neutron Shielding Capacities of Datolite and Galena by Boron Carbide Additive for Nuclear Reactor Biological Shielding 核反应堆生物屏蔽用碳化硼添加剂提高沸石和方铅矿的中子屏蔽能力
Pub Date : 2019-01-01 DOI: 10.4172/2161-0398.1000278
R. Mehrnejad
Biological shielding of nuclear reactor is an important interest and diminishing the intricacy and cost of theseinstallations is important interest. In this paper, we used Datolite and Galena minerals and boron carbide for nuclear reactor shielding aim. Datolite and Galena minerals that exist in many parts of world were used in the concrete mix design. Boron carbide is an important material for neutron absorption processes. The cross section in matter and neutron capture is utilizable causes to explain neutron shielding characteristics of samples. Neutron cross section simulations of samples have done by using a source of 14.1 MeV reactor neutrons. Cross section and number of captured neutrons of each sample were estimated by using Geant4 Monte Carlo code. As a result, growing boron carbide concentration can raise cross section value of Datolite and galena.
核反应堆的生物屏蔽是一个重要的研究方向,降低这些设施的复杂性和成本是一个重要的研究方向。本文采用钛沸石、方铅矿和碳化硼作为核反应堆的屏蔽靶。在混凝土配合比设计中采用了世界上许多地方都存在的Datolite和方铅矿矿物。碳化硼是中子吸收过程的重要材料。物质俘获和中子俘获截面是解释样品中子屏蔽特性的有效原因。用14.1 MeV反应堆中子源对样品进行了中子截面模拟。利用Geant4蒙特卡罗程序估计了每个样品的截面和捕获中子数。结果表明,增大碳化硼浓度可提高Datolite和方铅矿的截面值。
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引用次数: 1
Study of the Conjugation of Ethyl Benzene Dehydrogenation to Styrene with Steam Conversion of Carbon Monoxide on a Magnesium-Zirconium Catalyst 乙苯脱氢制苯乙烯与一氧化碳蒸汽转化在镁锆催化剂上的共轭反应研究
Pub Date : 2019-01-01 DOI: 10.4172/2161-0398.1000277
Mamedova Mt
The steam conversion of carbon monoxide, the conjugation of the conversion of ethyl benzene (EB) to styrene (St) with the steam conversion of carbon monoxide (SCCM) and the conversion of ethyl benzene to styrene in the presence of CO2 on a low-temperature magnesium-zirconium catalyst modified with phosphoric acid and copper were studied. It has been established that by the conjugation of conversion of EB to styrene with the steam conversion of carbon monoxide, it is possible to create a highly efficient, environmentally friendly process for the production of styrene and hydrogen with a relatively low expenditure of additional capital and energy.
在以磷酸和铜改性的低温镁锆催化剂上,研究了一氧化碳的蒸汽转化、乙苯(EB)与一氧化碳(SCCM)的蒸汽转化和乙苯在CO2存在下的共轭反应。已经确定,通过将EB转化为苯乙烯与一氧化碳的蒸汽转化相结合,可以创造一种高效,环保的苯乙烯和氢气生产工艺,并且额外的资本和能源支出相对较低。
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引用次数: 0
Climate change and global warming: thoughts of a Quaker scientist 气候变化和全球变暖:一位贵格会科学家的想法
Pub Date : 2018-12-01 DOI: 10.4172/2161-0398-C3-033
R. Tuckett
This talk arises from two articles recently accepted for publication by Elsevier in their Reference Modules [1,2]; the first also comes out next year in paper copy in the 3rd edition of Encyclopaedia Analytical Sciences, Written for the intelligent nonexpert, the science of the greenhouse effect and the most up-to-date data are presented in the first article [1]. In summary, the two most significant secondary greenhouse gases remain CO2 and CH4, together they contribute c. 80-85% of the secondary greenhouse effect, and this percentage has not changed for the last 20-30 years. CH4 could indeed prove to be as serious a secondary greenhouse gas as CO2. However, the total radiative forcing which causes the increase in Planet Earth’s temperature has increased consistently over this time window, and the huge majority of the world’s scientists now accept that we have a huge environmental issue on our hands that will not disappear. In the second article [2], suggestions are made as what issues people should think about from individual, government and world positions. The author is a practicing member of the Quaker (Society of Friends) religion, and throughout he comes to this problem from a moral viewpoint. This will not be a talk about religion, but rather how the six Quaker Testimonies (i.e. way we should lead our lives) on Truth and Integrity, Social Justice, Equality, Simplicity, Peace and Sustainability lead him in certain personal directions, and what advice he might give to Governments and World organisations (e.g. the United Nations). A concise and simple explanation of the Quaker religion in the UK in 2017 is written elsewhere [3]; much of it may surprise many delegates! The average temperature of the Earth (red) and the concentration level of CO2 in the Earth’s atmosphere (in red) during the recent history since AD1880. (Stoft http://zfacts.com/p/226.html or Hocker http://wattsupwiththat.com/2010/06/09/). A rise of 1 F is equivalent to 0.56°C. From a scientific viewpoint, there is no proven correlation between the two sets of data. Climate change, broadly interpreted, is a significant and lasting change in the statistical distribution of weather patterns over periods ranging from decades to millions of years. It may be a change in average weather conditions, or in the distribution of weather around the average conditions (such as more or fewer extreme weather events). Climate change is caused by factors that include oceanic processes (such as oceanic circulation), biotic processes (e.g., plants), variations in solar radiation received by Earth, plate tectonics and volcanic eruptions, and human-induced alterations of the natural world. The latter effect is currently causing global warming, and "climate change" is often used to describe human-specific impacts. During the 1970s, scientific opinion increasingly favored the warming viewpoint. From ancient times, people suspected that the climate of a region could change over the course of centuries.
这次演讲源于爱思唯尔最近在其参考模块[1,2]中接受发表的两篇文章;第一篇也将于明年在第三版的《分析科学百科全书》(Encyclopaedia Analytical Sciences)中以纸质形式出版,这是为聪明的非专家编写的,温室效应的科学和最新的数据在第一篇文章中提出[1]。总之,两种最重要的二次温室气体仍然是CO2和CH4,它们共同贡献了80-85%的二次温室效应,并且这一百分比在过去20-30年中没有变化。甲烷确实可以被证明是和二氧化碳一样严重的第二温室气体。然而,导致地球温度升高的总辐射强迫在这段时间内持续增加,世界上绝大多数科学家现在都承认,我们面临着一个巨大的环境问题,这个问题不会消失。在第二篇文章[2]中,从个人、政府和世界的角度提出了人们应该思考的问题。作者是贵格会(友会)宗教的实践成员,自始至终他都是从道德的角度来看待这个问题的。这不是一个关于宗教的演讲,而是贵格会关于真理和正直、社会正义、平等、简单、和平和可持续发展的六个见证(即我们应该如何生活)如何引导他走向某些个人方向,以及他可能给政府和世界组织(例如联合国)什么建议。关于2017年英国贵格会宗教的简明扼要的解释在别处写着[3];其中很多内容可能会让许多代表感到惊讶!自公元1880年以来的近代历史中,地球的平均温度(红色)和地球大气中二氧化碳的浓度水平(红色)。(Stoft http://zfacts.com/p/226.html或Hocker http://wattsupwiththat.com/2010/06/09/)。升高1华氏度相当于0.56°C。从科学的角度来看,这两组数据之间没有可证实的相关性。从广义上讲,气候变化是在几十年到数百万年的时间里,天气模式统计分布发生的重大而持久的变化。它可能是平均天气条件的变化,或者是平均条件周围天气分布的变化(例如极端天气事件的增多或减少)。造成气候变化的因素包括海洋过程(如海洋环流)、生物过程(如植物)、地球接收的太阳辐射的变化、板块构造和火山爆发,以及人类引起的自然界的改变。后一种效应目前正在导致全球变暖,而“气候变化”经常被用来描述人类特有的影响。在20世纪70年代,科学观点越来越倾向于变暖的观点。从古代开始,人们就怀疑一个地区的气候会在几个世纪的时间里发生变化。到20世纪90年代,由于计算机模型的保真度不断提高,加上观测工作证实了伊兰科维奇的冰期理论,人们形成了一种共识:温室气体与大多数气候变化密切相关,而人类造成的排放正在带来明显的全球变暖。自20世纪90年代以来,气候变化的科学研究已包括多个学科,并不断扩大。研究扩大了我们对因果关系的理解,与历史数据的联系,以及对气候变化进行数值模拟的能力。政府间气候变化专门委员会的评估报告总结了这一时期的研究。人类碳排放导致地球温度升高的证据一年比一年强。虽然无法证明,但有人认为二氧化碳浓度和地球温度之间的相关性是有史以来最强的。因此,现在需要世界各地的个人和政府采取行动,保护每个人免受几乎不可避免的气温上升的影响。甲烷可能被证明是和二氧化碳一样严重的二次温室气体。建议英国在立法和适应生活方式方面做出可能的改变。在全球范围内,并希望这些主题被公开,对碳的过度使用,食物及其生产,以及世界人口水平进行了讨论。将引力子拉格朗日量表示为引力子体积上的曲率积分,并将引力坐标和速度表示为哈密顿张量。在引力场中,时空坐标是变形的。在这样的场中,任何平面波都保持垂直于测地线,而波面的额外加速度是可能的。扩展的抽象
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引用次数: 0
Biodiesel Production from Neem Seed ( Azadirachta indica ) Oil Using Calcium Oxide as Heterogeneous Catalyst 氧化钙催化印楝籽油制备生物柴油
Pub Date : 2018-04-01 DOI: 10.4172/2161-0398.1000266
H. Banu, Tsodiya Banu Shallangwa, Innocent Joseph, T. Magu, Sadia Ahmed, Louis Hitler
Biofuel is an alternative and environment friendly source of energy, originated by the use of fossil fuels and have led to a notable growing demand from the last few decades. As biodiesel are usually acquired from renewable sources like vegetable and animal oils, for example coconut oil is extracted from the coconut and then characterized for further usage. The aim of this study is to investigate the production of biodiesel from neem oil and to characterize the parameters that affect biodiesel performance. The Biodiesel was produced using trans-esterification process resulting in the values of saponification 191 mg KOH/g, iodine 10 mgl2/g, acid 14.0 mg KOH/g, density 0.91 g, viscosity 23 mm2/s and flash point 266°C. The biodiesel was also characterized and showed that the it has density of 820 kg/m3, viscosity 3.5 mm2/s, saponification value 91 mg KOH/g, iodine value 8.9 mgl2/g, acid content 30.8 mg KOH/g and flash point 110°C. The physicochemical properties obtained were also compared to standard biodiesel in the range of ASTM specifications.
生物燃料是一种可替代的环境友好型能源,起源于化石燃料的使用,并在过去几十年中导致了显著增长的需求。由于生物柴油通常是从可再生资源如植物油和动物油中获得的,例如椰子油是从椰子中提取的,然后进行表征以供进一步使用。本研究的目的是研究从楝树油生产生物柴油,并表征影响生物柴油性能的参数。采用反式酯化工艺制备生物柴油,皂化值为191 mg KOH/g,碘10 mgl2/g,酸14.0 mg KOH/g,密度0.91 g,粘度23 mm2/s,闪点266℃。该生物柴油的密度为820 kg/m3,粘度为3.5 mm2/s,皂化值为91 mg KOH/g,碘值为8.9 mgl2/g,酸含量为30.8 mg KOH/g,闪点为110℃。获得的物理化学性质也与ASTM规格范围内的标准生物柴油进行了比较。
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引用次数: 7
Biological Activities of Resveratrol against Cancer 白藜芦醇抗癌的生物学活性
Pub Date : 2018-04-01 DOI: 10.4172/2161-0398.1000267
S. Kim, S. Z. Kim
Resveratrol (RSV) is a polyphenolic compound naturally found in grapes, peanuts, and berries. Considerable research has been performed to determine the benefits of RSV against various human diseases, especially cancer. Despite numerous studies on the effect of RSV on cancer, correct understanding of its mechanism is still far from certainty. This review summarizes the recent results on the molecular mechanisms and pathways of actions of RSV against major cancers. According to investigations accomplished worldwide, RSV targets pathways such as cell cycle progression, autophagy, apoptosis, angiogenesis and invasion/metastasis to attenuate cancer progression mediated through PI3K/Akt/mTOR, Wnt, ROS, NF-κB, BAX/Bcl-2, AMPK, ERK, MAPK signaling pathway. Considering the sideeffects and data of clinical trials, RSV can be used for its maximum benefits in human diseases. Available published data provide strong clues on the impact of RSV on cancer management.
白藜芦醇(RSV)是一种多酚类化合物,天然存在于葡萄、花生和浆果中。已经进行了大量的研究来确定RSV对各种人类疾病,特别是癌症的益处。尽管有许多关于RSV对癌症的影响的研究,但对其机制的正确理解仍远未确定。本文综述了近年来RSV对主要肿瘤的分子机制和作用途径的研究进展。根据世界范围内的研究,RSV靶向细胞周期进程、自噬、凋亡、血管生成和侵袭/转移等途径,以减弱PI3K/Akt/mTOR、Wnt、ROS、NF-κB、BAX/Bcl-2、AMPK、ERK、MAPK等信号通路介导的癌症进展。考虑到副作用和临床试验数据,RSV可在人类疾病中发挥其最大效益。现有已发表的数据为RSV对癌症管理的影响提供了强有力的线索。
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引用次数: 6
期刊
Journal of physical chemistry & biophysics
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