Balanced nested designs are closely related to other combinatorial structures such as balanced arrays and balanced n-ary designs. In particular, the existence of symmetric balanced nested designs is equivalent to the existence of some balanced arrays. In this paper, various constructions for symmetric balanced nested designs are provided. They are used to determine the spectrum of symmetric bal...

In this note the existence of a (Vj P2j 4, 2) BTD I for P2 = 0, 1 and 2, in which any pair of blocks intersect in at most two elements, is proved for any admissible v. A balanced ternary design is a collection of multi-sets of size k, chosen from a v-set in such a way that each element occurs 0, 1 or 2 times in anyone block, each pair of non-distinct elements, {x, x}, occurs in P2 blocks of the...

Fertilization in Fucus serratus is directly proportional to the number of sperm added, saturating at approximately 250 sperm per egg with an apparent Km of 120 sperm per egg. The effect of a range of lectins on fertilization has been tested. Preincubation of gametes with Con A and fucose-binding protein (FBP) inhibited fertilization. At low concentrations this was by specifically binding to egg...

The low level of productivity observed in pineapple fields Centre Came-roon must be sustainably reduced order to increase producers’ income while using the same resources. identification and control production constraints are key steps optimizing use limited To this end, FAO land assessment methodology following Fuzzy-MCDM pro-tocol was used for two basins Centre, namely Awae Bokito. It found t...

Mammalian fertilization comprises sperm migration through the female reproductive tract, biochemical and morphological changes to sperm, and sperm-egg interaction in the oviduct. Recent gene knockout approaches in mice have revealed that many factors previously considered important for fertilization are largely dispensable, or if they are essential, they have an unexpected function. These resul...

Scientific and medical development simulates reality reflects its image as a natural inevitability necessity of life. However, the misconduct or abuse right that some biologists who specialize in this field may commit, what is practiced by specialized doctors during their application technique human reproductive fertilization, such negligently deliberately manipulating cells destroying them, wi...

Shallot ( Allium cepa L.) is one of the strategic horticultural commodities in North Sulawesi which has high economic value with increasing demand Increased must be balanced increased production that can meet community's need for shallots. Increasing shallots done by fertilizing. The study aimed to examine growth and yield response various types fertilizers. research was conducted Pamuli Villag...

we examined the demographic characteristics of couples, ovarian response and sperm quality to determine the predictors of clinical fertilization in ivf cycles. a descriptive and analytic study was conducted using data and biologic specimens obtained fatemeh-alzahra of babol infertility center from 2004 to 2005. only data from 315 women who had medical indication for conventional ivf treatment w...

Background: Although in vitro fertilization (IVF) has been found to bypass the inhibitory effect of high levels of antisperm antibodies on sperm motility, fertilization rates are reduced in approximately 40% of the attempts. In this study, we investigated the relationship between antisperm antibodies measured by the direct mixed agglutination reaction (MAR) and the fertilization rate in inferti...