INTRODUCTION Gingival margin position in relation to synthetic crowns and crown length could be etiological factors in gingival health. CASE PRESENTATION A 27-year-old male presented with necrotizing ulcerative gingivitis with short clinical crowns suggestive of altered passive eruption. Three years after the initial diagnosis, he presented with crowns on the maxillary incisors. There were sh...

Direct enantioseparation of racemic amine, amino-thiophene-2-yl-acetonitrile (TAN), on chiral crown ether stationary phase [Crownpak CR (+)] is described in this study. The elution behavior and the effect of acid additives on resolution of racemic amine, TAN, is intensely investigated. Moreover, the chiral recognition mechanism in this specific system is proposed based on computational methods ...

Nitrogen deposition has been proven to facilitate the establishment of alien plants. Previous studies have certified that nitrogen enhances resource availability habitats and promotes growth invaders. Arbuscular mycorrhizal fungi (AMF) symbiose with vascular plants assist in nutrient acquisition. AMF colonization be another driving factor plant invasion. However, few integrated inoculation into...

The research aimed to produce new genotypes by hybridization. It was conducted in the Ornamental Plants Research Center of Mahallat from 2016 to 2018. Four varieties of gladiolus including Amsterdam, White Prosperity, Advance Red and Rose Supreme were chosen for hybridization. The progenies were evaluated in a randomized complete block design with three replications. The highest heritability in...

Projective cover (PC) and aboveground biomass (AGB) are the key traits with space attributes of individual plants. They are crucial to the understanding of the plant dynamics and plant patterns at population level. Spatial patterns based on individual plant positions (IND) have been extensively investigated in previous studies. However, very few have focused on PC and AGB. We tested the hypothe...

According to Cattell's [Cattell, R.B. (1987). Intelligence: Its structure, growth and action. New York: North-Holland.] Investment theory individual differences in acquisition of knowledge and skills are partly the result of investment of Fluid Intelligence (Gf) in learning situations demanding insights in complex relations. If this theory holds true Gf will be a factor of General Intelligence ...

Single-crystal X-ray analysis of the 5'-bromo-l',3'-xyly~-l8-crown-5* tert-butylammonium hexafluorophosphate complex shows that the complex is of the "nesting" type in which the cation and the aryl group are on the same face of the macroring and that the macroring has a (ag'a)(ag-a)lag'a)(ag-a)(ag'a)lag-a) eonformation. Among crown ethers with aryl-sub-units, 1' ,3'-xylyl crown ethers (1) have ...