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Papillary cystadenoma of the parotid gland: A case report.
BackgroundPapillary cystadenoma is a rare benign epithelial tumor of the salivary gland, which is characterized by papillary structures and oncocytic cells with rich eosinophilic cytoplasm. We found only one case of papillary cystadenoma in nearly 700 cases of salivary gland tumors. Our case was initially mistaken for a tumor of the right temporomandibular joint (TMJ) capsule rather than of parotid gland origin. Preoperative magnetic resonance imaging (MRI) and computed tomography (CT) should be carefully studied, which allows for appropriate preoperative counseling and operative planning.Case summaryHere, we report an unusual case of a 54-year-old woman with a parotid gland papillary cystadenoma (PGPC) that was misdiagnosed as a tumor of the right TMJ capsule. She was initially admitted to our hospital due to a mass anterior to her right ear inadvertently found 5 d ago. Preoperative CT and MRI revealed a well circumscribed tumor that was attached to the right TMJ capsule. The patient underwent a resection through an incision for TMJ, but evaluation of an intraoperative frozen section revealed a benign tumor of the parotid gland. Then we removed part of the parotid gland above the temporal facial trunk. The facial nerve was preserved. Postoperative histopathological findings revealed that the tumor was PGPC. No additional treatment was performed. There was no recurrence during a 20-mo follow-up period.ConclusionThe integrity of the interstitial space around the condyle in MRI or CT should be carefully evaluated for parotid gland or TMJ tumors
Fractional Denoising for 3D Molecular Pre-training
Coordinate denoising is a promising 3D molecular pre-training method, which
has achieved remarkable performance in various downstream drug discovery tasks.
Theoretically, the objective is equivalent to learning the force field, which
is revealed helpful for downstream tasks. Nevertheless, there are two
challenges for coordinate denoising to learn an effective force field, i.e. low
coverage samples and isotropic force field. The underlying reason is that
molecular distributions assumed by existing denoising methods fail to capture
the anisotropic characteristic of molecules. To tackle these challenges, we
propose a novel hybrid noise strategy, including noises on both dihedral angel
and coordinate. However, denoising such hybrid noise in a traditional way is no
more equivalent to learning the force field. Through theoretical deductions, we
find that the problem is caused by the dependency of the input conformation for
covariance. To this end, we propose to decouple the two types of noise and
design a novel fractional denoising method (Frad), which only denoises the
latter coordinate part. In this way, Frad enjoys both the merits of sampling
more low-energy structures and the force field equivalence. Extensive
experiments show the effectiveness of Frad in molecular representation, with a
new state-of-the-art on 9 out of 12 tasks of QM9 and on 7 out of 8 targets of
MD17
Based on Two and Three Dimensional Technology to quickly build a Virtual Battlefield
AbstractVirtual battlefield environment is the use of computer technology, graphics technology and virtual reality technology to the real battle space in the computer. As technology advances and development, virtual battlefield environment system has been applied more and more combat troops and combat command being. Virtual Battlefield Environment Simulation System is a system for the commander to provide a realistic battlefield environment to facilitate their understanding of the terrain, the battlefield awareness information. In this paper, two-dimensional battlefield maps based on MapObject structures and the construction of three-dimensional virtual battlefield environment problem, a second, three-dimensional virtual battlefield environment with the rapid construction techniques. Operational commanders can quickly build a virtual battlefield, not only from the macro real-time battlefield information and to grasp the battlefield situation, but also learned from the battlefield of detailed microscopic details
Onsite data processing and monitoring for the Daya Bay Experiment
The Daya Bay Reactor Neutrino Experiment started running on September 23,
2011. The offline computing environment, consisting of 11 servers at Daya Bay,
was built to process onsite data. With current computing ability, onsite data
processing is running smoothly. The Performance Quality Monitoring system (PQM)
has been developed to monitor the detector performance and data quality. Its
main feature is the ability to efficiently process multi-data-stream from three
experimental halls. The PQM processes raw data files from the Daya Bay data
acquisition system, generates and publishes histograms via a graphical web
interface by executing the user-defined algorithm modules, and saves the
histograms for permanent storage. The fact that the whole process takes only
around 40 minutes makes it valuable for the shift crew to monitor the running
status of all the sub-detectors and the data quality
Predictions of Light Hadronic Decays of Heavy Quarkonium 1D_2 States in NRQCD
The inclusive light hadronic decays of 1D_2 heavy quarkonia are studied
within the framework of NRQCD at the leading order in and up to the order
of . With one-loop QCD corrections, the infrared divergences and
Coulomb singularities in the decay amplitudes are proved to be absorbed by the
renormalization of the matrix elements of corresponding NRQCD operators, and
the infrared finite short-distance coefficients are obtained through the
matching calculations. By taking the factorization scale to be 2m_Q, the light
hadronic decay widths are estimated to be about 274, 4.7, and 8.8 KeV for the
, and respectively. Based on the above
estimates, and using the E1 transition width and dipion transition width for
the estimated elsewhere, we get the total width of to
be about 660-810 KeV, and the branching ratio of the E1 transition
to be about (44-54)%, which will be useful in
searching for this missing charmonium state through, e.g., the process
followed by .Comment: 27 pages, 10 figure
N-(2,6-DiisopropylÂphenÂyl)-N-{3-[(2,6-diisopropylÂphenÂyl)imino]Âbutan-2-yl}azaÂnide trichloridostannate(II)
In the title compound, (C28H43N2)[SnCl3], two pairs of molecular species are present in the asymmetric unit. The employed α-diimine opens up, forming a highly asymmetric ammonium that has its protons at one of the N atoms [N—C= 1.264 (4) and 1.516 (4) Å]. One of the C=N double bonds was oxidized to C—N, which is consistent with the bond length of 1.516 (4) Å. Meanwhile SnIV was reduced to SnII. The (SnCl)3
− anion is trigonal–pyramidal. In the crystal, molÂecules are linked by C—H⋯Cl, N—H⋯Cl, N—H⋯N and C—H⋯N bonds. The crystal studied was twinned by pseudo-merohedry
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