514 research outputs found
Scaphidium liui Tang & Li 2010, sp. n.
No full textScaphidium liui Tang & Li, sp. n. urn:lsid:zoobank.org:act: 940ED9AD-9D44-444F-9628-7384469AE8D6 Figs 39–42 Type Material. Holotype: CHINA: Xizang: male, glued on a board with labels as follows: “ Xizang, Motuo County, Yadong, alt. 1250m, 25.V.1980, coll. Jin Gen-Tao & Wu Jian-Yi ” “NO. 24205538” “ Holotype / Scaphidium liui / Tang & Li” [red Figures 3Ι–38. 3Ι–34 Scaphidium inflexitibiale 35–38 S. reni. 3Ι, 35 aedeagus 32, 36 internal sac in detail 33, 37 antenna 34, 38 male front leg in ventral view. Scales = 0.25 mm (3Ι, 32, 35, 36), scales = 1 mm (33, 34, 37, 38). handwritten label] (SEM). Paratypes. CHINA: Xizang: female, Motuo Couty, Kabu, 1070m, 14. V.1980, coll. Jin Gen-Tao & Wu Jian-Yi (NO. 24205537, SEM). BL: 8.0– 9.1 mm, ED: 0.36–0.40 mm, PL / PW of male: 0.79, PL / PW of female: 0.76. Extremely similar to S. reni sp. n., differing only in the following characters: body form slightly narrower; last antennal segment light brown in about apical third; apical portion of elytra indistinctly impressed; internal sac of aedeagus as in Figs 39, 40. Distribution. China (Xizang). Diagnoses. This new species was wrongly recorded as S. dureli Achard, 1922 in He et al., 2009. Scaphidium dureli is now known only from the type locality “BritishPublished as part of Tang, Liang & Li, Li-Zhen, 2010, On Scaphidium grande-complex (Coleoptera, Staphylinidae, Scaphidiinae), pp. 65-78 in ZooKeys 43 (43) on pages 75-76, DOI: 10.3897/zookeys.43.447, http://zenodo.org/record/57665
Age and growth of Salmo trutta fario L. from Yadong River, Tibet
No full textA total of 462 specimens of Salmo trutta fario L. were collected front Yadong River, Tibet, during the period front 1999 to 2002. The population structure and growth characteristics of Salmo trutta fario L. were studied in [lie present paper. Age of 302 individuals was determined with scales. The Von Bertalanffy growth model was fitted to mean lengths of estimated ages of individual fish and estimated growth parameters, female (female) L-t = 709. 44 [1 e(-0.1656(t.-0.0845))] (R-2 = 0.9993, n = 132) and W-t 6017.46[1e (-0.1656(t-0.0845))](2.9724) (R-2 = 0.9845, n = 132); male(male), 797.82[1 - e(-0.14280(t. - 0.0058))] (R-2 = 0.9994, n = 170) and W-t 8566.72 [1 - e(-0.14280 (t - 0.0058))](2.9822) (R-2 = 0.9724, n = 170). Sex ratio of female and male was 1 : 1.29. Growth index was 9.05-14.23 (female) and 10.76-19.22 (male); the mean standard length was 192.60 +/- 69.92 mm (female) and 188.91 +/- 53.18 mm (male). The results showed that the growth rate was significantly different between sexes (p < 0.01 male fish appeared to grow at a faster rate and had longer life-spans than females
Patch method for culture of primary hippocampal neurons
Get PDFCulture of primary neurons, and especially hippocampal neurons, is important for understanding cellular mechanisms in neurobiology. Actually, this is achieved by using culture dish or glass slide with surface coated proteins. Here, we proposed a patch method for culture of primary neurons on a monolayer of gelatin nanofibers electrospun and crosslinked on a honeycomb microframe of poly (ethylene glycol) diacrylate (PEGDA). This method allows us to minimize exogenous material contact of cells and largely increase the exposure area of cells to the culture medium. We found that neurons, and especially astrocytes, have a more in vivo like morphology comparing to that on culture dish or on glass slide. We also found that neurons were preferentially located in the suspended areas of the monolayer nanofibers. Finally, calcium imaging revealed that primary neurons have a higher degree of neural activity on the patch than on glass. These results suggest that crosslinked and monolayer gelatin nanofibers closely mimic the extracellular matrix structure and allow more effective culture of primary neurons than conventional methods, thus facilitating advanced studies of neural functions as well as cell-based assays
Early subduction-exhumation and late channel flow of the Greater Himalayan Sequence: implications from the Yadong section in the eastern Himalaya
No full textBased on metamorphic studies of the Yadong high-pressure (HP) granulite and multiple thermochronological investigations of granitoids from both upper and lower parts, the Yadong section in the eastern Himalaya constrains the Cenozoic tectonic evolution of the Greater Himalayan Sequence (GHS). The Yadong HP granulite, located at the top of the GHS, underwent a peak-stage HP granulite facies metamorphism and two stages of retrograde metamorphism. Granulite and hornblende facies retrograde metamorphism took place at 48.5 and 31.8 Ma, respectively, marking the time of exhumation of the subducted Indian slab to lower and middle crustal levels. Subsequently, an average young zircon U-Pb age obtained from the Yadong HP granulite indicated that this unit was captured by its surroundings in a partially molten condition at 16.9 Ma. In addition, three granitoids from both the lower and the upper parts of the GHS yielded biotite Ar-40/Ar-39 ages of 11.0, 11.3, and 11.5 million years. These consistent ages suggest that the GHS along the Yadong section was laterally extruded and synchronously cooled to similar to 300 degrees C at similar to 11.3 Ma. Furthermore, the granitic gneisses yield apatite fission track ages of similar to 7 million years, documenting the cooling of the GHS to similar to 110 degrees C. A two-stage model describes the Cenozoic tectonic evolution of the GHS: (1) the Indian slab had subducted under Tibet before similar to 55 Ma, and was exhumed to the lower crust (50-40 km) at 48.5 Ma, and to the middle crust (22-15 km) at 31.8 Ma; and (2) the partial melting occurred at middle crustal levels during the period 31.8 to 16.9 Ma, causing channel flow. In the late stage, the GHS was laterally extruded by ductile mid-crustal flow during the period 16.9 to similar to 7 Ma, characterized by a fast cooling rate of similar to 2 mm per year.http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000304452700004&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8e1609b174ce4e31116a60747a720701GeologySCI(E)5ARTICLE101184-12025
Recommended from our members
The Relationship between Environmental Performance and Financial Performance – A Multilevel Perspective
No full textMany business managers start to adopt environmental–friendly activities due to pressures and concerns regarding the potential negative environmental impacts from their regular activities. However, there is no consensus regarding whether better environmental performance can lead to superior financial performance. Academic research also shows mixed or even contradictory results, possibly due to various limitations and problems. This study builds a multilevel framework to study the complicated relationship between environmental performance and financial return and reconcile those non–consensus results in many previous studies. An overall positive relationship is found between environmental and financial performance with variances across companies and industries due to company– and industry–level heterogeneities. Negative relationship is also identified for some firms in certain industries. Moreover, the bi–directional causal relationship between environmental and financial performance also imply that it is necessary for companies to have sufficient financial resources in order to implement proactive environmental strategies and initiatives. The findings in this study make contributions to the literature, provide guidelines for managers and investors, and give implications for policy makers.</p
FIGURE 2 in Molecular phylogenetics and diversity of the Himalayan shrew (Soriculus nigrescens Gray, 1842) (Eulipotyphla, Soricidae) in Southwest China
No full textFIGURE 2: Maximum Likelihood and Bayesian phylogenetic trees based on the mitochondrial Cyt-B (A) and nuclear (APOB, BRCA-1, and RAG-2) (B) sequences. Branch numbers refer to BEAST posterior probabilities (Left: PP), ML posterior probabilities (Middle: PP), and ML bootstrap support values (Right: BS). The mtDNA and nuDNA lineages have been labeled with different colors: blue for Clade A, red for Clade B, and purple for Clade YN. The abbreviations represent the sampling sites (DR: Dingri; NLM: Nielamu; YD: Yadong; MT-L: Motuo low altitude; MT-H: Motuo high altitude; BM: Bomi; BY: Bayi; ML: Milin; GBJD: Gongbujiangda; LX: Langxian).Published as part of Jiang, Haijun, Fu, Changkun, Tang, Keyi, Li, Fengjun, Faiz, Abu Ul Hassan, Guo, Keji, Liu, Shaoying & Chen, Shunde, 2023, Molecular phylogenetics and diversity of the Himalayan shrew (Soriculus nigrescens Gray, 1842) (Eulipotyphla, Soricidae) in Southwest China, pp. 61-78 in Zootaxa 5263 (1) on page 65, DOI: 10.11646/zootaxa.5263.1.3, http://zenodo.org/record/779780
Earinus pallitarsus Tang & Achterberg & Chen 2018, sp. nov.
No full text<i>Earinus pallitarsus</i> sp. nov. <p>Figure 5</p> <p> <b>Description.</b> Holotype, ♀, length of body 8.7 mm, of fore wing 7.5 mm, of ovipositor sheath 5.0 mm.</p> <p> <i>Head</i>. Antennomeres 40, length of third antennomere 1.1 × fourth antennomere, length of third, fourth and penultimate antennomeres 3.75, 3.25 and 1.75 × their width, respectively; maxillary palp 1.1 ×height of head; length of malar space 1.85 × basal width of mandible; in dorsal view length of eye 2.3 × temple; POL:OD:OOL = 14:6:11; face shiny, nearly smooth with very sparse minute punctures; between antennal sockets two carinae and a short groove; frons, vertex and temple shiny with very sparse minute punctures.</p> <p> <i>Mesosoma</i>. Length of mesosoma 1.6 × its height; subpronope large and deep; pronotum shiny and largely smooth; area near lateral carina of mesoscutum smooth anteriorly and crenulate posteriorly; notauli completely absent; mesoscutum shiny with sparse fine punctures and setae, slightly depressed medio-posteriorly; scutellar sulcus short, 0.2 × scutellum and with 2 carinae; scutellum distinctly narrowed posteriorly, sparsely finely punctate; precoxal sulcus absent; mesopleuron shiny, smooth; metapleuron nearly smooth with sparse punctures; propodeum with two medial parallel carinae from base to apex of propodeum.</p> <p> <i>Wings</i>. Fore wing: second submarginal cell pentagonal; vein SR1 straight; r:3-SR:SR1 = 2:1:32; vein 1-SR+M entirely sclerotized. Hind wing: vein M+CU 1.3 × vein 1-M.</p> <p> <i>Legs</i>. Length of hind femur, tibia and basitarsus 4.3, 8.5 and 8.4 × their width, respectively; hind femur (as remainder of legs) with short setae; length of outer and inner spur of middle tibia 0.2 and 0.4 × middle basitarsus, respectively; outer apex of hind tibia with a cluster of 7 pegs; length of outer and inner spur of hind tibia 0.3 and 0.4 × hind basitarsus; tarsal claws with medium-sized lobe and apical tooth slender.</p> <p> <i>Metasoma</i>. First tergite widened apically, slightly depressed laterally, with short dorsal carinae basally; length of first tergite 1.5 × its apical width; second tergite 1.2 × as long as third tergite; metasoma shiny and smooth but basal 2/3 of first tergite faintly striate; ovipositor sheath 0.7 × as long as fore wing, widened apically.</p> <p> <i>Colour</i>. Black; mandible black; palpi, tegulae and legs pale yellowish; hind tibia very faintly infuscate basally; apex of hind tibia and third-fifth segments of hind tarsus dark brown; hind basitarsus pale yellowish; hind spurs dark brown; wing membrane infuscate.</p> <p> <b>Material examined.</b> Holotype: ♀, China, Tibet, Yadong, 23.VII.1978, Li Fa-Sheng, No. 871927 (ZJUH).</p> <p> <b>Distribution.</b> China (Tibet)</p> <p> <b>Biology.</b> Unknown.</p> <p> <b>Etymology.</b> From “pallens” (Latin for “pale”) and “tarsus” (Greek for “flat part of foot”), because of the pale hind basitarsus.</p> <p> <b>Diagnosis.</b> The new species is similar to <i>E. burmensis</i> Gupta et Bhat, 1974, but differs by having the first metasomal tergite 1.5 × its apical width (twice in <i>E. burmensis</i>); the ovipositor sheath shorter, 0.7 ×as long as fore wing (as long as fore wing) and the mandible black (yellow). The new species is also similar to <i>E. aurantius</i> van Achterberg et Long, 2010, but differs by having the mandible black (yellow in <i>E. aurantius</i>); the hind basitarsus pale yellowish (largely dark brown) and the scapus swollen subbasally (less so).</p>Published as part of <i>Tang, Pu, Achterberg, Cornelis Van & Chen, Xue-Xin, 2018, Review of the genus Earinus Wesmael (Hymenoptera, Braconidae, Agathidinae) from China, pp. 345-358 in Zootaxa 4504 (3)</i> on pages 352-354, DOI: 10.11646/zootaxa.4504.3.2, <a href="http://zenodo.org/record/2606436">http://zenodo.org/record/2606436</a>
Conception et étude de microsystèmes avancés pour la recherche de cellules souches et de cellules cancéreuses.
Get PDFThis work aimed to provide new tools and methods that can be used for advanced studies of stem cells and cancer cells. We first developed a patch method for off-ground culture and differentiation of human induced pluripotent stem cells (hiPSCs). The culture patch we proposed consists of crosslinked monolayer gelatin nanofibers on a honeycomb frame to ensure minimal exogenous material contact and maximum permeability. Then, we demonstrated the formation of cardiac tissue constructs and motor neurons on the patch, started from embryoid-body like and monolayer hiPSC colonies, respectively. We also developed a microfluidic device with integrated filter for isolation of circulating tumor cells (CTCs), showing high capture performances in terms of efficiency, selectivity and cell viability. Finally, we evaluated the anti-cancer drug effect on the formation of tumor spheroids by using microfabricated agarose multi-wells. All together, we progressed in micro-engineering toward large scale applications.Ce travail a pour but de mettre au point des nouvelles méthodes pour la recherche avancée sur les cellules souches et les cellules cancéreuses. Nous avons d'abord développé une méthode de patch pour la culture et la différentiation des cellules souches pluripotentes induites humain (hiPSCs) "hors sol". Ce patch de culture est constitué des monocouches de nanofibres réticulées de gélatine sur un support en nid d'abeilles pour assurer un minimum de contact de matériel exogène et un maximum de perméabilité. Puis, nous avons démontré la formation des tissues cardiaques et des neurones moteurs sur le patch, partis de colonies des hiPSCs en forme d'embryoïdes et de monocouches respectivement. Nous avons également développé un dispositif microfluidique avec filtre intégré pour isoler les cellules tumorales circulantes (CTCs), montrant une haute performance de capture en termes d'efficacité, de sélectivité et de viabilité cellulaire. Enfin, nous avons évalué l'effet de drogue anticancéreuse à la formation des sphéroïdes tumoraux en utilisant des multi-puits d'agarose micro-fabriqués. Tous ensembles, nous avons progressé dans la micro-ingénierie vers des applications à grande échelle
Design and fabrication of advanced microdevices for stem cell and cancer cell studies
No full textCe travail a pour but de mettre au point des nouvelles méthodes pour la recherche avancée sur les cellules souches et les cellules cancéreuses. Nous avons d'abord développé une méthode de patch pour la culture et la différentiation des cellules souches pluripotentes induites humain (hiPSCs) "hors sol". Ce patch de culture est constitué des monocouches de nanofibres réticulées de gélatine sur un support en nid d'abeilles pour assurer un minimum de contact de matériel exogène et un maximum de perméabilité. Puis, nous avons démontré la formation des tissues cardiaques et des neurones moteurs sur le patch, partis de colonies des hiPSCs en forme d'embryoïdes et de monocouches respectivement. Nous avons également développé un dispositif microfluidique avec filtre intégré pour isoler les cellules tumorales circulantes (CTCs), montrant une haute performance de capture en termes d'efficacité, de sélectivité et de viabilité cellulaire. Enfin, nous avons évalué l'effet de drogue anticancéreuse à la formation des sphéroïdes tumoraux en utilisant des multi-puits d'agarose micro-fabriqués. Tous ensembles, nous avons progressé dans la micro-ingénierie vers des applications à grande échelle.This work aimed to provide new tools and methods that can be used for advanced studies of stem cells and cancer cells. We first developed a patch method for off-ground culture and differentiation of human induced pluripotent stem cells (hiPSCs). The culture patch we proposed consists of crosslinked monolayer gelatin nanofibers on a honeycomb frame to ensure minimal exogenous material contact and maximum permeability. Then, we demonstrated the formation of cardiac tissue constructs and motor neurons on the patch, started from embryoid-body like and monolayer hiPSC colonies, respectively. We also developed a microfluidic device with integrated filter for isolation of circulating tumor cells (CTCs), showing high capture performances in terms of efficiency, selectivity and cell viability. Finally, we evaluated the anti-cancer drug effect on the formation of tumor spheroids by using microfabricated agarose multi-wells. All together, we progressed in micro-engineering toward large scale applications
Convergence and superconvergence of a fully-discrete scheme for multi-term time fractional diffusion equations
No full textUsing finite element method in spatial direction and classical L1L1 approximation in temporal direction, a fully-discrete scheme is established for a class of two-dimensional multi-term time fractional diffusion equations with Caputo fractional derivatives. The stability analysis of the approximate scheme is proposed. The spatial global superconvergence and temporal convergence of order O(h2+τ2−α)O(h2+τ2−α) for the original variable in H1H1-norm is presented by means of properties of bilinear element and interpolation postprocessing technique, where hh and ττ are the step sizes in space and time, respectively. Finally, several numerical examples are implemented to evaluate the efficiency of the theoretical results
- …
