Skin aging is a natural process, which consists in reducing the biological activity of body’s cells, slowing down regenerative processes and loss of adaptability. The decisive role is played by genetic factors and associated with them external factors, such as: UV radiation, environmental pollution, smoking, improper care and internal factors connected with hormonal regulation disorders, poor n...

The aim of this paper is to give an overview of some of the existing homology theories for commutative (S-)algebras. We do not claim any originality; nor do we pretend to give a complete account. But the results in that field are widely spread in the literature, so for someone who does not actually work in that subject, it can be difficult to trace all the relationships between the different ho...

A Kleinian group Γ is a discrete subgroup of PSL2(C). When non-elementary, such a group possesses a unique non-empty minimal closed invariant subset ΛΓ of the Riemann sphere, called the limit set. A Kleinian group acts properly discontinuously on the complement ∆Γ of ΛΓ and so this set is called the domain of discontinuity. Such a group is said to be convex co-compact if it acts co-compactly on...

A Kleinian group Γ is a discrete subgroup of PSL2(C). When non-elementary, such a group possesses a unique non-empty minimal closed invariant subset ΛΓ of the Riemann sphere, called the limit set. A Kleinian group acts properly discontinuously on the complement ∆Γ of ΛΓ and so this set is called the domain of discontinuity. Such a group is said to be convex co-compact if it acts co-compactly on...

Elec tro mutive-force me thods a nd ce ll s without liquid junc tion have been uti lized to de te rmine the ac id ic d issociati on co ns tant of protona ted tri s(hydrox ymethyl)a minome th a ne 12-amino-2-(hydrox yme th yl)1, 3p ropa nedi ulJ in 50 wt pe rcent methanol so lve nt a t seve n te mperatures fro m ]0 to 40 °C. Th e c hange of the di ssoc iat ion cons ta nt with te mpera ture has b...

w h ic h is w id el y u se d to si m u la te n eu tr o n sc at te ri n g in st ru m en ts . T h e n ew co m p o n en t al lo w s th e sa m p le to b e d es cr ib ed b y it s m at er ia l d yn am ic st ru ct u re fa ct o r, w h ic h is se p ara te d in to co h er en t an d in co h er en t co n tr ib u ti o n s. T h e ef fe ct s o f ab so rp ti o n an d m u lt ip le sc at te ri n g ar e tr ea te ...

SO(p, q) = {g ∈ SLp+q(R) : g>Qg = Q} (where Q = ( 1p 0 0 −1q ) )  SU(2) −→ SO(3) SL2(R) −→ SO(2, 1) SU(2)× SU(2) −→ SO(4) SL2(C) −→ SO(3, 1) SL2(R)× SL2(R) −→ SO(2, 2) Sp∗(2, 0) −→ SO(5) Sp∗(1, 1) −→ SO(4, 1) Sp2(R) −→ SO(3, 2) SU(4) −→ SO(6) SL2(H) −→ SO(5, 1) SU(2, 2) −→ SO(4, 2) SL4(R) −→ SO(3, 3) Thus, these are small examples...

A colorimetric and turn-on fluorescent probe 1 bearing triphenylamine-thiophene and dicyanovinyl groups has been synthesized and used to detect cyanide anion via a nucleophilic addition reaction. Probe 1 exhibited prominent selectivity and sensitivity towards CN- in aqueous media, even in the presence of other anions such as S2-, HS-, SO₃2-, S₂O₃2-, S₂O₈2-, I-, Br-, Cl-, F-, NO₂-, N₃-, SO₄2-, S...