UNLABELLED Intra-oral scanners will play a central role in digital dentistry in the near future. In this study the accuracy of three intra-oral scanners was compared. MATERIALS AND METHODS A master model made of stone was fitted with three high precision manufactured PEEK cylinders and scanned with three intra-oral scanners: the CEREC (Sirona), the iTero (Cadent) and the Lava COS (3M). In sof...

Atmospheric carbonyl sulfide (COS) was monitored at the GIF site (France) from August 2014 to November 2021. A significant decreasing trend in seasonal cycle amplitude (SCA) of COS observed for first time Northern Hemisphere (−27 ppt over 6 years). The lowest SCA recorded 2021 (80 vs. 107 2015). results revealed a steeper decline spring maximum than that autumn minimum (−49 −10 years, respectiv...

Significance Assessment for large-scale photosynthesis-climate feedbacks is needed. Carbonyl sulfide (COS) an emerging proxy the terrestrial photosynthesis. This limited by uncertainties related to magnitudes of COS sources and sinks. Here, we demonstrate measurement-based assessments isotopic signal of: tropospheric COS, marine anthropogenic emissions, fractionation plant uptake. All these res...

BACKGROUND There are few studies on pediatric HIV-HBV coinfection, so evidences about relationships between the two viruses are scarce. OBJECTIVES influence of HBV infection on virological and immunological response to antiretroviral therapy (ART) in antiretroviral-naïve horizontally HIV-HBV coinfected subjects during early childhood. MATERIAL AND METHODS observational study on 826 HIV+ sub...

An impression technique called optical impression using intraoral scanner has attracted attention in digital dentistry. This study aimed to evaluate the accuracy of the optical impression, comparing a virtual model reproduced by an intraoral scanner to a working cast made by conventional silicone impression technique. Two implants were placed on a master model. Working casts made of plaster wer...

To enhance the mechanical and antibacterial properties of silver nanoparticle impregnated cellulosic fibers, carboxy-cellulose nanocrystals(CCNs) were grafted with chitooligosaccharide(COS), which was used as a stabilizer for nanoparticles (AgNPs). Nanofibrous membranes reinforced fibers(CCN-COS-AgNP) prepared via electrospinning using polyvinyl alcohol(PVA) matrix. The effects CCN-COS-AgNP con...

One can prove the following propositions: (1) For all real numbers a, b holds −(a + bi) = −a + (−b)i. (2) For all real numbers a, b such that b > 0 there exists a real number r such that r = b · −⌊ b ⌋ + a and 0 ¬ r and r < b. (3) Let a, b, c be real numbers. Suppose a > 0 and b ­ 0 and c ­ 0 and b < a and c < a. Let i be an integer. If b = c + a · i, then b = c. (4) For all real numbers a, b h...

Carbonyl sulfide (COS) and dimethyl sulfide (DMS) fluxes from an urban Cynodon dactylon lawn and adjacent bare soil were measured during April-July 2005 in Guangzhou, China. Both the lawn and bare soil acted as sinks for COS and sources for DMS. The mean fluxes of COS and DMS in the lawn (-19.27 and 18.16 pmol/(m2 sec), respectively) were significantly higher than those in the bare soil (-9.89 ...

Chi (x, 5'-GCTGGTGG) is a recombinator in RecAand RecBC-mediated recombination in Escherichia coli. In vegetative recombination between two bacteriophage lambda strains, one with and the other without Chi (a+x+bX u-Xob+), the X-containing recombinant (a-X+b-) is less abundant than the nonx-containing recombinant (a+xob+). Previously this was taken was evidence for nonreciprocality of X-stimulat...

1 Trigonometric Functions We recall the following identities for trigonometric functions. Theorem 1.1. For all x ∈ R, cos(−x) = cos(x) and sin(−x) = − sin(x). Theorem 1.2. For all α, β ∈ R, cos(α + β) = cos(α) cos(β)− sin(α) sin(β). Theorem 1.3. For all α, β ∈ R, sin(α+ β) = sin(α) cos(β) + cos(α) sin(β). Proof. For small positive angles (so α+ β is less than a right angle), the identities from...