منابع مشابه
Catalase and Oxidase Content of Seeds in Re- Lation to Their Dormancy, Age, Vitality, and Respiration
For some years the Seed-Testing Laboratories of the Bureau of Plant Industry has been using daily alternating temperatures for the germination of certain seeds. In these alternations the lower temperature is used about 18 hours and the higher temperature about 6 hours of the day. Alternating temperatures are found especially favorable for the germination of the seeds of certain grasses: Johnson...
متن کاملVitality of optical vortices
Optical vortices are always created or annihilated in pairs with opposite topological charges. However, the presence of such a vortex dipole does not directly indicate whether they are associated with a creation or an annihilation event. Here we propose a method to distinguish between vortex dipoles that have just been created and those that are about to be annihilated. We use first and second ...
متن کاملDeductive Analysis of the TERM of Urban Vitality With Indigenous Vitality in historic background in Isfahan
Urban vitality is a new term in the specialized literature of urban planning. Despite numerous definitions of vitality by experts, These definitions are defined according to different aspects of vitality, equivalent to the socio-cultural characteristics of other countries. But vitality existed in cities before it became known in the urban literature and had different definitions in each culture...
متن کاملMethods of sperm vitality assessment.
Sperm vitality is a reflection of the proportion of live, membrane-intact spermatozoa determined by either dye exclusion or osmoregulatory capacity under hypo-osmotic conditions. In this chapter we address the two most common methods of sperm vitality assessment: eosin-nigrosin staining and the hypo-osmotic swelling test, both utilized in clinical Andrology laboratories.
متن کاملOn the Vitality of Vitalism
MANY OF those who share an interest in the life sciences today, perhaps most, would agree with the claim that vitalism is obsolete. Some prominent biologists now use ‘vitalism’ as a derogatory label associated with lack of intellectual rigour, anti-scientific attitudes, and superstition (see, e.g., Dawkins, 1988). Other scientific commentators treat the term more seriously, but equally arrive a...
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ژورنال
عنوان ژورنال: Nature
سال: 1895
ISSN: 0028-0836,1476-4687
DOI: 10.1038/052005b0