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Db白矮星

天文学进展 1987年第1期 74-79页

作者： J.b.oke 左林美国加利福尼亚理工学院天文系

白矮星是一种简并星,它可分为DA、Db、DC、DF和DG 5种。其中,DA占90％,剩下的大多是Db。关于Db白矮星,我们知道的很少,主要是由于下面几个原因: 1.在Db恒星大气中富含氦,这给恒星大气模型的计算带来了很大的困难; ***星要远远少于DA星... 详细信息

白矮星是一种简并星,它可分为DA、Db、DC、DF和DG 5种。其中,DA占90％,剩下的大多是Db。关于Db白矮星,我们知道的很少,主要是由于下面几个原因: 1.在Db恒星大气中富含氦,这给恒星大气模型的计算带来了很大的困难; ***星要远远少于DA星,一般说来它们也要暗得多,对最近的Db星,其距离约是40pc,而视星等大于14~m。这样,高质量的光谱就很少; 3.它的光谱对引力g不是很敏感,所以要测量g就需要非常好的光谱。

关键词：白矮星出生率 DA Db 恒星大气模型

Functional roles of taurine,L-theanine,Lcitrulline,and betaine during heat stress in poultry

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Journal of Animal Science and biotechnology 2022年第4期13卷 967-986页

作者： Victoria Anthony Uyanga Emmanuel Ooke Felix Kwame Amevor Jingpeng Zhao Xiaojuan Wang Hongchao Jiao Okanlawon mOnagbesan Hai Lin Department of Animal Science College of Animal Science and Veterinary MedicineShandong Provincial Key Laboratory of Animal Biotechnology and Disease ControlShandong Agricultural UniversityNo.61 Daizong StreetTai’an 271018Shandong ProvinceChina Department of Animal Physiology Federal University of AgricultureP.M.BAbeokutaOgun State 2240Nigeria Farm Animal Genetic Resources Exploration and Innovation Key Laboratory of Sichuan Province Sichuan Agricultural UniversityChengduSichuanChina.

Heat stress(HS)is an important environmental stress factor affecting poultry production on a global *** the rise in ambient temperature and increasing effects of global warming,it becomes pertinent to understand the effects of HS on poultry production and the strategies that can be adopted to mitigate its detrimental impacts on the performance,health,welfare,immunity,and survival of *** acids(AAs)have been increasingly adopted as nutritional modifiers in animals to ameliorate the adverse effects of *** are essential for protein synthesis,growth,maintenance,reproduction,immunity,stress response,and whole-body ***,HS tends to adversely affect the availability,transport,absorption,and utilization of these *** have investigated the provision of these AAs to poultry during HS conditions,and variable findings have been ***,L-theanine,and L-citrulline are non-essential amino acids that are increasingly gaining attention as nutritional supplements in HS ***,betaine is an amino acid derivative that possesses favorable biological properties which contributes to its role as a functional additive during *** particular note,taurine is negligible in plants,while betaine,L-theanine,and L-citrulline can be found in selected *** nutrients are barely found in feed ingredients,but their supply has been shown to elicit important physiological roles including anti-stress effects,anti-oxidative,anti-inflammatory,gut promoting,and immunomodulatory *** present review provides information on the use of these nutritionally and physiologically beneficial nutrients as functional additives to poultry diets during HS ***,although several studies have reported on the positive effects of these additives in human and murine studies,however,there is limited information regarding their utilization during heat stress in poultry ***,this review aims to expound on the functional pr

关键词： Amino acids Antioxidant Heat Stress Immunity Inflammation Nutrition Performance Poultry

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类星体Q1232+134及其多重红移系统

中国科学:数学 1985年第11期 1022-1029页

作者：何香涛,崔振兴,R. D. Cannon,m. G. Smith,J. b. oke 北京师范大学天文系中国科学院北京天文台苏格兰皇家天文台苏格兰皇家天文台美国加利福尼亚理工学院爱丁堡爱丁堡帕萨迪纳

Q1234+134是1982年在室女座星系团区域内发现的一颗类星体。本文介绍了用UK Schmidt的物端棱镜巡天和美国Palomar山天文台5m望远镜的分光观测结果;列出了全部的发射线和它们的红移值Ze=2.364±0.002;对吸收光谱进行了分析,给出了29根吸... 详细信息

Q1234+134是1982年在室女座星系团区域内发现的一颗类星体。本文介绍了用UK Schmidt的物端棱镜巡天和美国Palomar山天文台5m望远镜的分光观测结果;列出了全部的发射线和它们的红移值Ze=2.364±0.002;对吸收光谱进行了分析,给出了29根吸收线和两个较可靠的吸收线红移系统（ZaⅠ=2.279,ZaⅡ=2.249）及一个可能系统（ZaⅢ=1.734）。最后,对本文的结果进行了讨论。

关键词：类星体多重星系团活动星系类星体吸收线 Q1232+134 红移谱线位移

Evaluation at the Level of Health Facilities, of the Protective Efficacy of LLINs in Children under 5 Years Old from Localities of Low and High Resistance of Vectors to Pyrethroid Insecticides in benin in West Africa

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Advances in Infectious Diseases 2022年第1期12卷 57-73页

作者： Tokponnon Tatchémè Filémon Ossè Razaki Arthur Sovi Wakpo Abel Hounto Ogouyémi Aurore Sissinto Yolande Adechoubou Alioun Houansou Télesphore oke mariam Kinde-Gazard Dorothée massougbodji Achille Akogbeto martin Centre de Recherche Entomologique de Cotonou (CREC) Cotonou Benin ministry of Health Cotonou Benin Centre béninois de le Recherche Scientifique et de l’Innovation Cotonou Benin Ecole Polytechnique d’Abomey-Calavi Université d’Abomey-Calavi Abomey-Calavi Bénin Ecole de Gestion et d’exploitation des systèmes d’élevage Université Nationale d’Agriculture Kétou Benin Faculté des Sciences de la Santé de l’Université d’Abomey Calavi Cotonou Benin National malaria Control Programme Cotonou Benin World Health Organization Cotonou Benin

Context: The resistance to pyrethroids in malaria vectors continues to grow in Africa and could therefore compromise or reduce substantially the effectiveness of LLINs in preventing malaria. It is therefore of paramount importance to evaluate the protective efficacy of LLINs in children sleeping in areas of vector resistance to insecticides in order to draw lessons for future interventions. This study assesses the effect of the use of LLINs on malaria morbidity in clusters of low and high resistance of vectors to pyrethroids. methods: This is a cross-sectional case-control study with one control for one case that was conducted in the communes of Kétou, Ifangni, Kétou, and Pobè in the Plateau department of southern benin. The use of LLINs and malaria morbidity was measured and compared in children from clusters of low and high vector resistance to insecticides. In each commune, 30 cases and 30 controls were recruited for a total of 240 children under 5 years of age from villages with low and high insecticide resistance. Results: According to the localities of origin of the children, of all parents of children surveyed, 169 (70.4%) asserted the children slept under an LLIN the day before they arrived at the health center. This rate represents 70.8% (85 children) among the cases and 70.0% (84 children) among the controls without significant difference (p = 0.8). The use of LLINs the day before the survey, the frequency of their use during the two weeks preceding the day of the survey, their availability at the household level, the use of other tools for protection against mosquito bites are the same in the two groups of children (cases and controls) (p > 0.05) as well in low and high resistance villages. On the other hand, the parasite prevalence, the splenomegaly and the geometric means of the parasite densities, are significantly higher in the cases than in the controls (p Conclusion: The evaluation of epidemiological indicators in children under five years old at th

关键词： Case-Controls LLINs malaria morbidity Pyrethroids Resistance benin

Seepage Investigation on an Existing Dam Using Very Low Frequency Electromagnetic (VLF-Em) methods: A Case Study of Shagari Earth Dam, Sokoto, North Western Nigeria

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International Journal of Geosciences 2020年第2期11卷 25-36页

作者： U. Z. magawata D. S. bonde b. U. Abdullahi basiru Qudus m. N. Yahaya Physics Department Kebbi State University of Science and Technology Aliero Nigeria Department of Science Laboratory Technology The Oke-Ogun Polytechnic Saki Oyo State Nigeria Department of Physics with Electronics Federal University Birnin-Kebbi Birnin Kebbi Nigeria

Very low frequency (VLF-Em) was used to assess variations in overburden composition, bedrock lithology and the hidden Sedimentary structures within the foundation of Shagari Dam of the sedimentary basin of Northwestern Nigeria. Four VLF-electromagnetic (Em) traverses were occupied at 10 m in-tervals. The VLF normal and filtered real component irregularities identify major geological interfaces suspected to be faults/fractured zones. The points of crossover between the real and imaginary components delineate the fractured zones, which were identified as areas of possible seepage (sloughing and piping). The fractured zones are suspected to be present at all traverses. In total, 38 fractured zones were identified along the dam embankment and canal site, while 17 major fractures occurrence dippers along the Traverses at a point, Traverse 1 (F3, F4, F5, F7, F10, F11), Traverse 2 (F12, F13, F21, F22), Traverse 3 (F23, F24, F29) and Traverse 4 (F32, F33, F34, F38), and coincide with cross over point at 4 traverses. These seepage zones cause heterogeneity in the sub-surface structure that could be prime to dam failure which in turn leads to the flooding, decreases in irrigations activities of the peoples leaving around the dam and loss of several hundreds of life when care not taken. The result of the study suggests that VLF is suitable for observing seepages in embankment dams.

关键词： Overburden Interfaces Occurrence Heterogeneity Embankment

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白细胞计数的相对升高可预测首次脑梗死

世界核心医学期刊文摘（神经病学分册） 2005年第10期1卷 55-56页

作者： Elkind m.S.V. Sciacca R.R. boden-Albala b. 史焕昌 Neurologic Institute Box 182 710 W. 168 St. New York NY 10032 United States

background: Atherosclerosis is an inflammatory disease, and leukocyte levels are associated with future risk of ischemic cardiac disease. Objective: To inves tigate the hypothesis that relative elevations in leukocyte count in a stroke- free population predict future ischemic stroke (IS). methods: A populationbased prospective cohort study was performed in a multiethnic urban population. Stroke - free community participants were identified by random- digit dialing. Leukoc yte levels were measured at enrollment, and participants were followed annually for IS, myocardial infarction (mI), and cause- specific mortality. Cox proporti onal hazards regression models were used to calculate hazard ratios (HRs) and 95 % CIs for IS, mI, and vascular death after adjustment for medical, behavioral, and socioeconomic factors. Results: Among 3,103 stroke- free community partici pants (mean age 69.2 ± 10.3 years) with baseline leukocyte levels measured, med ian follow- up was 5.2 years. After adjusting for stroke risk factors, each SD in leukocyte count (1.8 × 109 cells/L) was associated with an increased risk of IS (HR 1.22, 95% CI 1.05 to 1.42), and IS, mI, or vascular death (HR 1.13, 95 % CI 1.02 to 1.26). Compared with those in the lowest quartile of leukocyte co unt, those in the highest had an increased risk of IS (adjusted HR 1.75, 95% C I 1.08 to 2.82). The effect on atherosclerotic and cardioembolic stroke was grea ter than in other stroke subtypes. Conclusion: Relative elevations in leukocyte count are independently associated with an increased risk of future ischemic str oke and other cardiovascular events.

关键词：白细胞计数缺血性卒中卒中风险前瞻性队列研究血管疾病缺血性心脏病心血管事件四分位数可信区间回归模型

肝细胞性肝癌中淋巴细胞的浸润:T调节细胞的作用

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世界核心医学期刊文摘（胃肠病学分册） 2005年第8期1卷 47-48页

作者： Unitt E Rushbrook S.m marshall A G.J.m. Alexander 王铮 box 157 Addenbro oke’s NHS Trust Hill’s RoadCambridge CB2 2QQ United Kingdom

Hepatocellular carcinoma (HCC) has a poor prognosis with limited therapeutic o ptions. We propose that local immune responses in patients with HCC are held in check by tumorinfiltrating CD4+CD25+T-regulatory lymphocytes(Treg cells),which suppress the activity and proliferation of effector CD4+and CD8 +T cells. The phenotype and cell cycle status of tumor-infiltrating lymphocyte s (TILs) in HCC were analyzed via immunohistochemistry of sections from patients undergoing surgery for HCC and via flow cytometry of peripheral blood mononucle ar cells and TILs isolated from patients with *** and tumor-infiltr ating T-cell function and activation status were assessed via proliferation and flow cytometry. more than 96%of TILs were quiescent as measured via mcm-2 or Ki-67 expression, while less than 10%of CD8+T cells expressed perform or gran zyme b. CD4+CD25+Treg cells comprised 8.7%(1.4-13.8) of TILs and always exce ed- ed the proportion in distant nontumor tissue (2.4%[1.5-5.6]; P = .014). Treg cells isolated from HCC suppressed proliferation of autologous circulating CD4 +CD25-cells and perforin expression and proliferation of autologous CD8+T cel ls. The proportion of circulating Treg cells in patients with HCC was similar in healthy controls(7.2%[1.2-23.3] and 9.2%[1.6-30.2], respectively), but the proportion of circulating Treg cells that were also transforming growth factor β1+was elevated in HCC compared with controls(55.5%[8.2-73.9] and 2.0%[0-4 .9], respectively; P = .003). In conclusion, TILs are compromised and contain a subpopulation of suppressive CD4+ CD25+Foxp3+Treg cells. Functional deletion of tumor-infiltrating Treg cells could enhance tumor specific immunot- herapy.

关键词：肝细胞性肝癌 T调节细胞中淋巴细胞肿瘤浸润循环血液流式细胞技术转化生长因子激活途径特异性免疫治疗免疫反应

1980—2000年确诊为首次心房纤颤患者缺血性卒中发生率和死亡率的时间趋势:社区研究报道

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世界核心医学期刊文摘（神经病学分册） 2006年第3期2卷 48-48页

作者： miyasaka Y. barnes m.E. Gersh b.J. T.S.m. Tsang 高宗恩 mayo Clinic 200 First St SW Rochester MN 55905 United States

background and Purpose -With the changes in management of atrial fibrillation (AF) over time, it is possible that the time trends of post-AF stroke incidenc e and mortality have changed. We sought to determine whether the incidence and survival of ischemic stroke after AF diagnosis have improved. methods -We identified the Olmsted County, minn, residents who developed first AF from 1980 to 2000 and followed them in medical records to 2004. The outcomes were first ischemic stroke and death. Results -Of the 4117 subjects diagnosed with first AF and without previous stroke, 446 (11%) sustained a first ischemic stroke during a mea n follow-up time of 5.5±5.0 years. The age-and sex-adjusted incidence of str oke decreased, on average, by 3.4%per year (P=0.0001), concurrent with an increase in warfarin and aspirin use (both P blood pressure (P mic stroke incidence was higher in women (P=0.039), but not after adjusting for systolic blood pressure (P=0.41). Compared with the general minnesota white population, the relative mortality hazard ratio was 1.88 for men and 1.84 for women without stroke and 3.03 for men and 3.80 for women (P oke. The relative mortality hazard did not vary by age or calendar year of AF diagnosis. Conclusions -Post-AF ischemic stroke incidence decreased significantly from 1980 to 2000, during which time a substantial increase in the use of antithrombotic therapy and reduction of systolic blood pressure was evident. The relative mortality risk of stroke, however, had not improved over time.

关键词：心房纤颤患者缺血性卒中时间趋势社区研究卒中发生率死亡风险奥姆斯特德预后指标抗血栓药物