2,032 research outputs found
Preparation of Arsenobetaine hydrobromide
Crystalline arsenobetaine hydrobromide is deposited directly on addition of trimethylarsine to a
benzene solution of bromoacetic acid. The product is stable, non-deliquescent and may be readily converted
into the free betaine by passage through basic ion exchange resin
A propeller flap for single-stage nose reconstruction in selected patients: supratrochlear artery axial propeller flap
The paramedian forehead flap is the gold standard technique for nose reconstruction. It requires two different surgical operations which prolonged the postoperative dressing and care. We present our 5-year experience with a propeller flap based on the supratrochlear artery, which allows one-stage transfer of the forehead skin to the nose without the need for pedicle division. This technique is indicated in a selected group of patients who are not suitable for multiple-stage reconstructions because they have concurrent medical conditions, reduced mobility, or live far away from specialized medical centers. We have renamed this procedure as supratrochlear artery axial propeller flap, from the acronym STAAP flap, to stress the axial, well known and constant, vascularization of the flap. In the past 5 years, we have been performing 25 STAAP flaps; full-thickness nasal reconstruction was performed in 11 cases. The patients were 16 males and 9 females, with a mean age of 79.5 years. All patients had multiple comorbidities. Complete flap survival was observed in 23 cases and healing was complete in 7 days. In two cases, there was a partial distal necrosis of the flap treated conservatively. Cosmetic results were good and the patient's satisfaction was significant. These results indicate that the STAAP flap is a reliable and useful technique in selected cases, as old or noncompliant patients who benefit from a one-stage technique of nose reconstructio
Extraction and identification of the main compound present in Elaeis guineensis flower volatiles
The main compound contained in the volatile oils of the oil palm flowers was identified as
l-methoxy-4 (2-propenyl) benzene or estragole. The same compound was extracted from the anthesizing
male and female flowers of the oil palm (Elaeis guineensis). The newly identified compound is
believed to be responsible for attracting the adults of the oil palm pollinating weevil, Elaeidobius
kemerunicus (Coleoptera: Curculionidae). Steam distillation of1 kg of fresh male and female flowers
yielded O.7g and O.2g of volatile oils. The chemical structure and characteristics were confirmed by
mass spectromeric analysis, nuclear magnetic resonance (NMR) analysis, and the infrared spectra
analysis. The possible usage of the compound in ecological research on the weevil and in the industry'
are discussed
A difficult case of necrotizing fasciitis caused by Acinetobacter baumannii
This study reports the case of a 55-year-old woman with diabetes with a necrotizing fasciitis of the right lower limb and the perineum, first admitted at the emergency department for septic shock with cardiac arrest, and later transferred to the department of surgery. Microbiological and histopathological examination confirmed the diagnosis of necrotizing fasciitis caused by Acinetobacter baumannii. A broad-spectrum antibiotic therapy was administered and later readjusted according to the results of microbiological culture. Intensive hemodynamic support was required. Wounds were dressed daily with a 3 percent boric acid solution and a silver sulfadiazine-impregnated dressing. An extensive surgical debridement was promptly performed and repeated until complete control of the infection. Wounds were finally covered with split-thickness skin grafts. The infection was overcome 35 days after admission. The graft take was 100%. Postoperative rehabilitation was required because of the functional limitation of lower limb movements. Follow-up at 6 months showed no functional deficit and an acceptable aesthetic result. Necrotizing fasciitis is a life-threatening disorder, especially in patients with diabetes, whose clinical diagnosis may sometimes be challenging. Early recognition and treatment represent the most important factors influencing surviva
Skewed Differentiation of Circulating Vγ9Vδ2 T Lymphocytes in Melanoma and Impact on Clinical Outcome
Objective
The aim of this study was to evaluate over time circulating γδ T lymphocytes in melanoma
patients in terms of frequency, effector functions, and relationship with clinical stage and
evolution, by comparing preoperative values to those obtained at a mean follow-up of 36
months or in the event of recurrence or disease progression, and to those of healthy controls.
Also, we correlated the presence of tumor-infiltrating γδ T lymphocytes with clinical
evolution of melanoma.
Results
Mean frequencies of circulating γδ T cells before and after melanoma removal were very
similar and comparable to healthy subjects, but patients who progressed to stage III or IV
showed a significantly decreased frequency of circulating Vγ9Vδ2 T cells. The distribution
of Vγ9Vδ2 memory and effector subsets was similar in healthy subjects and melanoma
patients at diagnosis, but circulating γδ T cells of patients after melanoma removal had a
skewed terminally-differentiated effector memory phenotype. Highly suggestive of progressive
differentiation toward a cytotoxic phenotype, Vγ9Vδ2T cells from patients at follow up
had increased cytotoxic potential and limited cytokine production capability, while the opposite
pattern was detected in Vγ9Vδ2T cells from patients before melanoma removal.
Conclusions
Follow-up data also showed that tumor infiltrating γδ T cells were significantly associated
with lower mortality and relapse rates, suggesting that they may serve as a prognostic biomarker,
for human melanom
Chemotaxonomy of the Lauraceae: N-Methyl-2,3,6 trimethoxymorphinandien- 7-one, the Major Alkaloid from Alseodaphne perakens'is
The leaves of Alseodaphne perakensis contain one major and a complex mixture of minor alkaloids. The
major component was identified as N-methyl-2,3, 6-trimethoxymorphinandien-7-one by spectroscopic analyses
of the parent compound, its methiodide salt and sodium borohydride reduction products
e+e- Pairs: a clock and a thermometer of heavy ion collisions
Recently, there is growing evidence that a new state of matter is formed in
sqrt(s_NN)= 200 GeV Au+Au collisions at RHIC: a strongly coupled Quark Gluon
Plasma of partonic degrees of freedom which develops a collective motion.
Dilepton spectra are not affected by strong interaction and can therefore probe
the whole time evolution of the collision. Thus they may be sensitive to onset
of deconfinement, chiral symmetry restoration, as well as the production of
thermal photons. The PHENIX experiment measured the production of e+e- pairs in
p+p and Au+Au collisions at sqrt(s_NN)= 200 GeV. An enhanced dilepton yield in
the mass range 150<m_ee<750 MeV/c^2 is measured. The excess increases faster
with centrality than the number of participating nucleons and is concentrated
at p_T<1GeV/c. At higher p_T the excess below 300 MeV/c^2 has been related to
an enhanced production of direct photons possibly of thermal origin.Comment: Proceedings of Quark Matter 2008, 8 pages, 7 figure
Composition of the Steam Volatile Oil from Hyptis suaveolens Poit
The steam volatile oil from the aerial parts of Hyptis suaveolens has been examined by combined
GC-MS. Of the 70 components detected, 38 have been identified accounting for approximately 86%
of the oil. ( β Caryophyllene was present to 41% and 1,8-cincole, terpinen-4-o 1, ex-bergamotene, sabinene
and ex -copaene were the other major components. This oil appears to be chemically distinct from the
one reported from H. suaveolens collected in South America
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