نتایج جستجو برای: developmental stage
تعداد نتایج: 465223 فیلتر نتایج به سال:
The reasons why growth and developmental rates vary widely among species have remained unclear. Previous examinations of possible environmental influences on growth rates of birds yielded few correlations, leading to suggestions that young may be growing at maximum rates allowed within physiological constraints. However, estimations of growth rates can be confounded by variation in relative dev...
How should one think about innovation in medicine and surgery? Increasingly, the answer to this question has involved reference to what might be called the regulatory ethics paradigm (REP). The regulatory ethics paradigm holds that deviations from standard care involve a degree or kind of experimentation that requires the application of a set of procedures designed to assure the protection of t...
In Nicotiana tabacum, female gametophytes are not fully developed at anthesis, but flower buds pollinated 12 h before anthesis produce mature embryo sacs. We investigated several pollination-associated parameters in N. tabacum flower buds to determine the developmental timing of important events in preparation for successful fertilization. First, we performed hand pollinations in flowers from s...
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