英文字典中文字典


英文字典中文字典51ZiDian.com



中文字典辞典   英文字典 a   b   c   d   e   f   g   h   i   j   k   l   m   n   o   p   q   r   s   t   u   v   w   x   y   z       







请输入英文单字,中文词皆可:

mesothorium    
n. 新钍

新钍

Mesothorium \Mes`o*tho"ri*um\, n. [NL.; meso- thorium.]
(Chem.)
a radioactive isotope of radium (radium-228) with a half-life
of 5.8 years. Also called {mesothorium-1} or {mesothorium I}
to distinguish it from a subsequent decay product,
mesothorium II (actinium-228). It was discovered in 1907 by
Otto Hahn as a decay product of thorium (produced by decay of
thorium-232). Mesothorium-1 (radium-228) in turn produces
actinium-228 (mesothorium-2) as the first product of its
radioactive decay, and the actinium-228 in turn decays
quickly (half-life of 6 hours) to thorium-228 (which is also
called {radiothorium}; the thorium-228 has a half-life of
1.91 years, shorter than that of the radium-228). It was
discovered and named before full recognition of the nature of
isotopes of the elements, and was distinguished from other
variants of radium by its half-life and mode of production
and decay. It was also cheaper to prepare than other
short-lived radium isotopes, and was thus sold commercially,
for use, e.g. in making watch dials readable in the dark by
painting the hands and hour marks with a self-luminous paint
containing the radioactive substance; it is therefore often
referred to (e.g. in regulatory legislation) as though
distinct from radium. It was one of the isotopes believed
responsible for radiation-induced diseases observed in
industrial workers who painted radium on watch dials in the
late 1950's and early 1960's. The primary isotope of radium
(radium-226) has a half-life of 1620 years, and these
isotopes with shorter half-lives proved difficult to isolate
and study for the purpose of finding the cause of such
diseases.
[Webster 1913 Suppl. PJC]


请选择你想看的字典辞典:
单词字典翻译
mesothorium查看 mesothorium 在百度字典中的解释百度英翻中〔查看〕
mesothorium查看 mesothorium 在Google字典中的解释Google英翻中〔查看〕
mesothorium查看 mesothorium 在Yahoo字典中的解释Yahoo英翻中〔查看〕





安装中文字典英文字典查询工具!


中文字典英文字典工具:
选择颜色:
输入中英文单字

































































英文字典中文字典相关资料:


  • Diverticulitis - Symptoms and causes - Mayo Clinic
    Prevention To help prevent diverticulitis: Exercise regularly Regular, vigorous exercise decreases the risk of diverticulitis Eat a high-fiber diet A high-fiber diet improves the movement of waste through the colon and decreases the risk of diverticulitis Fiber-rich foods include fruits, vegetables, whole grains, seeds and beans
  • Diverticulitis - Diagnosis and treatment - Mayo Clinic
    Diagnosis A number of conditions can cause pain and other symptoms related to diverticulitis Your health care professional will do an exam and order tests to determine the cause of symptoms During the physical exam, your healthcare professional will gently touch different parts of the abdomen to learn where you have pain or tenderness An exam also may include a pelvic exam to test for
  • Diverticulitis - Síntomas y causas - Mayo Clinic
    La diverticulitis leve se suele tratar con reposo, cambios en la alimentación y posiblemente antibióticos La diverticulitis grave suele requerir tratamiento con antibióticos en el hospital En los casos de diverticulitis recurrente o grave, se podría necesitar una cirugía
  • Diverticulitis diet - Mayo Clinic
    Diverticulitis is the name given to inflamed pockets formed by the wall of the large intestine The pockets, called diverticula, bubble through the intestine's wall When the diverticula get inflamed or infected, the condition is called diverticulitis This condition can cause sudden symptoms, called flare-ups, such as pain in the stomach area, fever and changes in stool With diverticulitis
  • Diverticulitis care at Mayo Clinic
    Diverticulitis care at Mayo Clinic Your Mayo Clinic Care team Professionals involved in your treatment team may include specialists in treating the digestive system (gastroenterologists), diagnostic radiologists and surgeons Depending on individual factors, you also may see an infectious disease specialist or a registered dietitian
  • Diverticulitis: Can certain foods trigger an attack? - Mayo Clinic
    No specific foods are known to trigger bouts of diverticulitis symptoms, also called attacks And no special diet has been proved to prevent attacks With diverticulitis, irregular bulging pouches in the wall of the large intestine become inflamed That can cause symptoms such as pain in the stomach area, fever and changes in stool
  • 憩室炎 - 症状与病因 - 妙佑医疗国际 - Mayo Clinic
    病因 随着时间的推移,在结肠壁中逐渐形成憩室。这在老年人中比较常见。结肠内的压力(可能来自痉挛或过度用力)可能导致在结肠壁的薄弱处形成憩室。 憩室炎是指一个或多个憩室发炎。这可能是由于细菌性疾病或憩室组织损伤所致。 风险因素 憩室炎在 50 岁以上人群中更为常见。可增加憩室
  • Diverticulosis and diverticulitis - Mayo Clinic
    Diverticulosis occurs when small, bulging pouches (diverticula) develop in your digestive tract When one or more of these pouches become inflamed or infected, the condition is called diverticulitis
  • Diverticulitis - Doctors and departments - Mayo Clinic
    Research Mayo Clinic researchers are working to improve the diagnosis and treatment of diverticulitis Specific efforts include better ways to predict the likelihood of repeat episodes of diverticulitis Publications See a list of publications about diverticulitis by Mayo Clinic researchers on PubMed, a service of the National Library of Medicine
  • Diverticulitis - Atención en Mayo Clinic - Mayo Clinic
    La diverticulitis puede ser difícil de diagnosticar porque el dolor abdominal es un síntoma de muchos trastornos digestivos Los médicos del personal de radiología de diagnóstico en Mayo Clinic tienen experiencia en la obtención de imágenes del aparato digestivo para distinguir la diverticulitis de otras afecciones





中文字典-英文字典  2005-2009