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Maquart Pierre-Olivier,Rahola Nil,Chhuoy Kalyan,Heng Kimly,Chhum Moeun,Suor Kimhuor,Boyer Sébastien 한국응용곤충학회 2023 Journal of Asia-Pacific Entomology Vol.26 No.2
Toxorhynchites are often nicknamed “elephant mosquitoes” due to their large size and bent proboscis. These colorful mosquitoes are generally covered with iridescent and metallic-colored scales and do not require blood feeding to perform their oogenesis since females acquire all the required proteins during their larval stages. Consequently, they are not involved in the transmission of pathogens, and are not considered to be of medical importance. This genus is comprised of 89 species worldwide, including three in Cambodia. During a survey conducted in Veun Sai Siem Pang National Park and in Kirirom National Park in 2021, several larvae of Toxo rhynchites were collected inside pitchers of the carnivorous plant Nepenthes smilesii. Upon investigation, they were proven to belong to a new species, Tx. domrey sp. nov., described in the present article. LSID: https://zoobank.org/6D09A56F-A509-4FE6-BE4B-BAB5F0CB748F.
Experimental and Numerical Investigation of the Erosive Potential of a Leading Edge Cavity
Jean-Bastien Carrat,Regiane Fortes-Patella,Jean-Pierre Franc 한국유체기계학회 2019 International journal of fluid machinery and syste Vol.12 No.2
This paper presents a joint experimental and numerical analysis of the erosive potential of an unsteady cavity that develops at the leading edge of a two-dimensional hydrofoil and periodically sheds vapour clouds. From an experimental viewpoint, the erosive potential was characterized by pressure pulse height spectra. The hydrofoil was equipped with eight pressure sensors made of PVDF piezoelectric film that allowed the measurement of flow aggressiveness at different locations along the hydrofoil chord. It was shown that the mean peak rate over a large number of cavity pulsations exhibits a maximum at a distance from the leading edge close to the maximum cavity length. Moreover, the increase in flow aggressiveness caused by an increase in flow velocity can be explained by an increase in both amplitude and frequency of impact loads. From a numerical viewpoint, the unsteady Reynolds averaged Navier-Stokes (RANS) equations were solved using a modified k-ε RNG turbulence model together with a homogeneous cavitation model within a two-dimensional approach. Flow aggressiveness was estimated from the Lagrangian derivative of the computed void fraction that allows identifying the regions of collapse of vapour structures. Three different critical regions from an erosive viewpoint were numerically identified. Apart from the region of collapse of the shed cloud (which was not instrumented in the present study), the computations showed a maximum of aggressiveness around the maximum cavity length as found experimentally. Another region of high aggressiveness closer to the leading edge and associated to the upward movement of the re-entrant jet was predicted by the present numerical model but not confirmed experimentally, which probably shows the limitation of a two-dimensional approach.
Stag beetle fauna of Cambodia (Coleoptera: Lucanidae)
Maquart Pierre-Olivier,Yamamoto Shûhei,Sopha Sin,Chhorn Soksan,Phak Satha,Sinovas Pablo,Phauk Sophany,Boyer Sébastien 한국응용곤충학회 2023 Journal of Asia-Pacific Entomology Vol.26 No.1
To date, no species catalogue of stag beetles (Lucanidae) has been compiled for Cambodia. According to the available literature, we assembled the checklist based on the previously recorded and recognized Cambodian lucanid species in the country. In the present paper, we newly record four species from Cambodia: Falcicornis axisopsis (Séguy, 1954); Neolucanus similis Bomans & Ratti, 1976; Prosopocoilus suturalis (Olivier, 1789); and Prosopocoilus jenkinsi (Westwood, 1848). An updated checklist of the Cambodian stag beetles is given. The total number of the Cambodian lucanid species has now reached 29, but this species count is considerably less diverse than those in neighboring countries. Our study suggested that this poor diversity is not primarily due to biogeography or small country size but to a lack of research effort.
Chemical forms of calcium in Ca,Zn- and Ca,Cd-containing grains excreted by tobacco trichomes
Sarret, Gé,raldine,Isaure, Marie-Pierre,Marcus, Matthew A,Harada, Emiko,Choi, Yong-Eui,Pairis, Sé,bastien,Fakra, Sirine,Manceau, Alain National Research Council 2007 Canadian journal of chemistry Vol.85 No.10
<P> Tobacco (Nicotiana tabacum L. cv. Xanthi) plants exposed to toxic levels of zinc and cadmium excrete metals through their leaf trichomes (epidermal hairs) as Zn,Ca- and Cd,Ca-containing grains. Little is known about the nature and formation mechanism of these precipitates. The chemical, crystalline, and noncrystalline compositions of individual grains produced by tobacco were studied by scanning electron microscopy coupled with energy dispersive X-ray analysis (SEM-EDX), micro-X-ray diffraction (µXRD), and calcium K-edge micro X-ray absorption near edge structure (µXANES) spectroscopy. Zinc is predominantly incorporated in calcite and cadmium in calcite and vaterite. Aragonite, which occurs occasionally, does not seem to contain trace metals. In addition to being precipitated in its three possible polymorphic forms, calcite, aragonite, and vaterite, calcium is also speciated as amorphous CaCO3 and possibly organic Ca in some grains. Most often, a particular grain consists of two or more crystalline and noncrystalline phases. The observed variability of intra- and inter-grain elemental and phase composition suggests that this biomineralization process is not constrained by biological factors but instead results from thermodynamically and kinetically controlled reactions. This study illustrates the potential of laterally resolved X-ray synchrotron radiation techniques (µXRD and µXANES) to study biomineralization and metal immobilization processes in plants.Key words: biomineralization, detoxification, micro-XANES, micro-XRD. </P>
Frigault Jonathan,Avoine Samuel,Drolet Sébastien,Letarte François,Bouchard Alexandre,Gagné Jean-Pierre,Thibault Claude,Grégoire Roger C.,Bouthillette Naomee Jutras,Gosselin Maude,Bouchard Philippe 대한대장항문학회 2023 Annals of Coloproctolgy Vol.39 No.2
Purpose: Laparoscopic right hemicolectomy (LRH) can be performed with an intracorporeal anastomosis (IA) or extracorporeal anastomosis (EA). It is not clear which technique is best. This study evaluated the impact of each anastomosis technique on perioperative safety and postoperative evolution. Methods: We performed a retrospective study at a tertiary colorectal surgery center. All patients who had an elective LRH from 2015 to 2019 were analyzed according to the anastomosis technique used. Results: In total, 285 patients were included in the study. IA was performed in 64 patients (22.5%). Mean operative time was longer in the patients with IA (IA, 160±31 minutes vs. EA, 138±42 minutes; P<0.001). No differences were observed in intraoperative complications, time to first bowel movement, length of stay, reoperation, or rehospitalization. Time to first flatus was longer in the patients with IA (P=0.049). At 30 days after surgery, there were no differences in the frequency of anastomotic leak (IA, 0% vs. EA, 2.3%; P=0.59), bleeding (IA, 3.1% vs. EA, 2.7%; P>0.99), or intraabdominal abscess (IA, 0% vs. EA, 0.5%; P>0.99). During follow-up, we noted more incisional hernias in patients with EA (IA, 1.6% vs. EA, 11.3%; P=0.01) and a trend toward more hernia in patients with EA in multivariate analysis (hazard ratio, 7.13; P=0.06). Anastomosis technique had no influence on recurrence. Conclusion: For LRH, both IA and EA are safe, with a low incidence of complications when performed by experienced surgeons. IA may be associated with a lower incidence of incisional hernia.
First Results from BISTRO: A SCUBA-2 Polarimeter Survey of the Gould Belt
Ward-Thompson, Derek,Pattle, Kate,Bastien, Pierre,Furuya, Ray S.,Kwon, Woojin,Lai, Shih-Ping,Qiu, Keping,Berry, David,Choi, Minho,Coudé,, Simon,Francesco, James Di,Hoang, Thiem,Franzmann, Erica American Astronomical Society 2017 The Astrophysical Journal Vol.842 No.1
<P>We present the first results from the B-fields In STar-forming Region Observations (BISTRO) survey, using the Sub-millimetre Common-User Bolometer Array. 2 camera, with its associated polarimeter (POL-2), on the James Clerk Maxwell Telescope in Hawaii. We discuss the survey's aims and objectives. We describe the rationale behind the survey, and the questions that. the survey will aim to answer. The most important of these is the role of magnetic fields in the star formation process on the scale of individual filaments and cores in dense regions. We describe the data acquisition and reduction processes for POL-2, demonstrating both repeatability and consistency with previous data. We present a first-look analysis of the first results from the BISTRO survey in the OMC 1 region. We see that the magnetic field lies approximately perpendicular to the famous 'integral filament' in the densest regions of that filament. Furthermore, we see an 'hourglass' magnetic field morphology extending beyond the densest region of the integral filament into the less-dense surrounding material, and discuss possible causes for this. We also discuss the more complex morphology seen along the Orion Bar region. We examine the morphology of the field along the lower-density northeastern filament. We find consistency with previous theoretical models that predict magnetic fields lying parallel to low-density, non-self-gravitating filaments, and perpendicular to higher-density, self-gravitating filaments.</P>