39 research outputs found
Seshadri constants and Grassmann bundles over curves
Let be a smooth complex projective curve, and let be a vector bundle
on which is not semistable. For a suitably chosen integer , let
be the Grassmann bundle over that parametrizes the quotients
of the fibers of of dimension . Assuming some numerical conditions on
the Harder-Narasimhan filtration of , we study Seshadri constants of ample
line bundles on . In many cases, we give the precise value of
Seshadri constant. Our results generalize various known results for .Comment: Final version; Annales Inst. Fourier (to appear
Studies in the formation of heterocyclic rings containing nitrogen. Part XXIII. Condensation of o-aminobenzamide with aldehydes and Schiff bases
N-arylidene orthanilamides undergo isomeric cyclisation in acetic acid to the corresponding 2-aryl-1, 2, 3, 4-tetrahydro-4-oxoquinazolines. The u.v. and n.m.r. spectra of some of the arylidene derivatives and their isomeric tetrahydroquinazolines have neeb studied. Condensation of o-aminobenzamide either with aromatic aldehydes in nitrobenzene or Schiff bases in acetic acid has yielded 2-aryl-4 (3H)-quinazolinones
Estudo etnobotânico como subsídio para elaboração de plano de manejo da reserva florestal Embrapa/Epagri no município de Caçador, Santa Catarina
Orientador: Raquel Rejane Bonato NegrelleMonografia (Bacharelado) - Universidade Federal do Paraná. Setor de Ciencias Biológicas. Curso de Graduaçao em Ciencias Biológica
Lagrangian simulations of the transport of young air masses to the top of the Asian monsoon anticyclone and into the tropical pipe
We have performed backward trajectory calculations and
simulations with the three-dimensional Chemical Lagrangian Model of the
Stratosphere (CLaMS) for two succeeding monsoon seasons using artificial
tracers of air mass origin. With these tracers we trace back the origin of
young air masses (age <6 months) at the top of the Asian monsoon
anticyclone and of air masses within the tropical pipe
(6 months < age <18 months) during summer 2008. The occurrence of
young air masses (<6 months) at the top of the Asian monsoon anticyclone up
to ∼460 K is in agreement with satellite
measurements of chlorodifluoromethane (HCFC-22) by the Michelson
Interferometer for Passive Atmospheric Sounding (MIPAS) instrument. HCFC-22
can be considered as a regional tracer for continental eastern Asia and the
Middle East as it is mainly emitted in
this region.
Our findings show that the transport of air masses from
boundary layer sources in the region of the Asian monsoon into the tropical
pipe occurs in three distinct steps. First, very fast uplift in “a
convective range” transports air masses up to 360 K potential
temperature within a few days. Second, air masses are uplifted from
about 360 K up to 460 K within “an upward spiralling range” within a
few months. The large-scale upward spiral extends from northern Africa
to the western Pacific. The air masses are transported upwards by
diabatic heating with a rate of up to 1–1.5 K per day, implying
strong vertical transport above the Asian monsoon anticyclone. Third,
transport of air masses occurs within the tropical pipe up to 550 K
associated with the large-scale Brewer–Dobson circulation within
∼1 year.
In the upward spiralling range, air masses are uplifted by diabatic
heating across the (lapse rate) tropopause, which does not act as a
transport barrier, in contrast to the extratropical tropopause.
Further, in the upward spiralling range air masses from inside the
Asian monsoon anticyclone are mixed with air masses convectively
uplifted outside the core of the Asian monsoon anticyclone in the
tropical adjacent regions. Moreover, the vertical transport of air
masses from the Asian monsoon anticyclone into the tropical pipe is
weak in terms of transported air masses compared to the transport from
the monsoon anticyclone into the northern extratropical lower
stratosphere. Air masses from the Asian monsoon anticyclone
(India/China) contribute a minor fraction to the composition of air
within the tropical pipe at 550 K (6 %), and the major fractions are
from Southeast Asia (16 %) and the tropical Pacific (15 %).</p
Human protein reference database—2006 update
Human Protein Reference Database (HPRD) () was developed to serve as a comprehensive collection of protein features, post-translational modifications (PTMs) and protein–protein interactions. Since the original report, this database has increased to >20 000 proteins entries and has become the largest database for literature-derived protein–protein interactions (>30 000) and PTMs (>8000) for human proteins. We have also introduced several new features in HPRD including: (i) protein isoforms, (ii) enhanced search options, (iii) linking of pathway annotations and (iv) integration of a novel browser, GenProt Viewer (), developed by us that allows integration of genomic and proteomic information. With the continued support and active participation by the biomedical community, we expect HPRD to become a unique source of curated information for the human proteome and spur biomedical discoveries based on integration of genomic, transcriptomic and proteomic data
Angle-closure glaucoma secondary to inflammatory capsular block syndrome following routine cataract surgery
A 78-year-old man had uneventful cataract surgery with implantation of a 1-piece plate–haptic intraocular lens in the capsular bag. Seven weeks later, he presented as an emergency with intense fibrinous uveitis and increased intraocular pressure (IOP). Examination revealed an inflammatory capsular block syndrome (CBS) causing fibrinous anterior uveitis and secondary angle-closure glaucoma. The glaucoma resolved and the patient’s vision improved following neodymium:YAG laser posterior capsulotomy. Inflammatory CBS should be considered in pseudophakic patients presenting with fibrinous anterior uveitis, increased IOP, and secondary angle closure