نتایج جستجو برای: fertilizing systems
تعداد نتایج: 1185222 فیلتر نتایج به سال:
Continuing to fertilize bareroot and container seedlings during the hardening process (from cessation of height growth until lifting) can improve seedling viability. The process of fertilizing during hardening has many names, but in the last decade a new term, nutrient loading, has come into use. The process of nutrient loading seedlings leads to luxury consumption indicated by foliar nitrogen ...
BACKGROUND Good quality spermatozoa are important to achieve fertilization, viable embryos and offspring. Single Layer Centrifugation (SLC) through a colloid (Androcoll-P) selects good quality spermatozoa. However, it has not been established previously whether porcine spermatozoa selected by this method maintain their fertility. METHODS The semen was prepared either by SLC or by standard cen...
BACKGROUND Our previous studies have demonstrated the cystic fibrosis transmembrane conductance regulator (CFTR) is important for capacitation and male fertility in mouse and guinea pig spermatozoa. However, the exact function of CFTR on human sperm fertilizing capacity, and correlation with sperm quality has not been established. The present study may shed light on some unexplained male infert...
Fertilization promoting peptide (FPP; pGlu-Glu-ProNH2), a tripeptide structurally related to thyrotrophin releasing hormone, is produced by the prostate gland and released into seminal plasma. Recent studies carried out in vitro have revealed that FPP elicits biologically important responses in both mouse and human spermatozoa. In the presence of physiological concentrations of FPP (50-100 nmol...
Recent advances in many areas of reproductive technology, such as intracytoplasmic sperm injection (ICSI) and other forms of assisted fertilization, have been rapid. In many respects, these advances have outstripped our knowledge of the fundamental processes of human and animal sperm–egg interactions at fertilization. One of the major unresolved issues is the identity of the complementary molec...
Plant mating systems have profound effects on levels and structuring of genetic variation and can affect the impact of natural selection. Although theory predicts that intermediate outcrossing rates may allow plants to prevent accumulation of deleterious alleles, few studies have empirically tested this prediction using genomic data. Here, we study the effect of mating system on purifying selec...
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