283 research outputs found
Urban forest in Shenyang
No full textThe Tijuca forest in the city of Rio de Janeiro is claimed to be the largest urban forest in the world. Maybe challengers to this title will come from China? In a paper published in 2011, Liu Changfu and Li Xiaoma bring to light the importance of urban forests in carbon storage using the case of Shenyang ((Liu Changfa & Li, Xiaoma (2011). Carbon storage and sequestration by urban forests in Shenyang, China. Urban Forestry & Urban Greening, Vol 11 (2), pp. 121-128)). In Europe, some urban fore..
Genome-wide analysis of regulation of gene expression and H3K9me2 distribution by JIL-1 kinase mediated histone H3S10 phosphorylation in Drosophila
Get PDFIn this study we have determined the genome-wide relationship of JIL-1 kinase mediated H3S10 phosphorylation with gene expression and the distribution of the epigenetic H3K9me2 mark. We show in wild-type salivary gland cells that the H3S10ph mark is predominantly enriched at active genes whereas the H3K9me2 mark is largely associated with inactive genes. Comparison of global transcription profiles in salivary glands from wild-type and JIL-1 null mutant larvae revealed that the expression levels of 1539 genes changed at least 2-fold in the mutant and that a substantial number (49%) of these genes were upregulated whereas 51% were downregulated. Furthermore, the results showed that downregulation of genes in the mutant was correlated with higher levels or acquisition of the H3K9me2 mark whereas upregulation of a gene was correlated with loss of or diminished H3K9 dimethylation. These results are compatible with a model where gene expression levels are modulated by the levels of the H3K9me2 mark independent of the state of the H3S10ph mark, which is not required for either transcription or gene activation to occur. Rather, H3S10 phosphorylation functions to indirectly maintain active transcription by counteracting H3K9 dimethylation and gene silencing.This article is published as Cai, Weili, Chao Wang, Yeran Li, Changfu Yao, Lu Shen, Sanzhen Liu, Xiaomin Bao et al. "Genome-wide analysis of regulation of gene expression and H3K9me2 distribution by JIL-1 kinase mediated histone H3S10 phosphorylation in Drosophila." Nucleic acids research 42, no. 9 (2014): 5456-5467. doi: 10.1093/nar/gku173.</p
Apanteles setosus Liu & Chen 2020, sp. nov.
No full textApanteles setosus Liu & Chen, sp. nov. (Figures 97, 103) Description. Holotype. Female. Body length 2.2 mm, fore wing length 2.5 mm. Head. Transverse in dorsal view, 2.1× as wide as long, nearly (1.1×) wider than mesoscutum. Vertex between eye and posterior ocellus shiny with small punctures. Temple weakly dull with punctures, slightly constricted. Face nearly 0.8× as high as wide, dull with strong punctures, inner margin of eyes slightly constricted towards apex. Ocelli small, posterior tangent to anterior ocellus virtually transecting posterior ocelli, distance between fore and hind ocellus larger than diameter of hind ocellus, POL:OD:OOL=6.0:2.0:4.0. Antenna slightly shorter than body length, closely articulated, penultimate flagellomere 1.4× longer than wide. Mesosoma. Length:width:height = 40.0:27.5:32.0. Disc of mesonotum shiny, with dense and strong punctures, interspaces shorter than diameter of puncture, characteristic dense, silvery, pubescence, on posterior half of mesoscutum pubescence becomes longer and silky, rugose-punctate at posterior end of notaulic courses. Scutellar sulcus curved, narrow with carinae in between. Scutellum dull with small punctures entirely, pubescence dense as posterior half of mesoscutum, wide posteriorly. Lateral polished field of scutellum reaching over half length of scutellum. Propodeum shiny, two short arms reaching out from orifice, spiracle not enclosed with keels, only some short carinae behind spiracle. Mesopleuron highly polished, most parts distributed with hairy punctures, becoming rugose along hind margin. Legs. Hind coxa dull, with hairy bumps dorsally. Spines on outer side of third tibia long, not dense. Inner spur half length of hind basitarsus, outer spur 1/3. Basitarsus of hind leg as long as tarsomeres 2–4 combined, claws of normal size. Wings. Pterostigma 3.3× as long as its widest part. Vein 1-R1 0.8× length of pterostigma, 1.8× as long as its distance from apex of marginal cell. Vein r arising from middle of pterostigma, slightly oblique outwards, slightly shorter than width of pterostigma, 1.2× longer than 2-SR, indistinctly angled at junction, 2-M half length of 2-SR and slightly shorter than 1-SR, 2-SR+M as long as m-cu and 2-SR. First discal cell of fore wing 1.2× wider than high. Second submarginal cell of hind wing 1.1× wider than high. Vein cu-a nearly straight. Hind wing not broad, length of 1-M not shorter than distance between its distal extremity and apex of vannal lobe, and vannal lobe beyond its widest part straight and hairless. Metasoma. Nearly 1.1× longer than mesosoma (43.5:40.0). T1 nearly parallel-sided, slightly constricted towards apex at apical third, 1.9× longer than hind width, concave at basal half, turned-over part slightly shiny with close, indistinct punctures medially, longitudinal channel short, shallow, and almost without rugosity, rugose laterally and apical tubercle polished. T2 slightly shiny and slightly rough, 4.6× wider than long in the middle, nearly straight apically. T3 2.2× longer than T2. Tergites posterior to T2 highly polished, shiny, and pubescent. Hypopygium not longer than apex of metasoma. Ovipositor sheath 1.1× longer than length of hind tibia, narrow of even size, hairs sparse and long. Colour. Black. Tegula dark brown. Palpi and spurs pale yellowish. Antenna and ovipositor sheath dark brown to black. Labrum and mandible dark brown. Legs dark, except most parts of fore femur with tibia and tarsus, mid tarsus (except apical segment brown) and mid tibia fumous, hind tibia and tarsus brown entirely. Wing membrane hyaline, 1-R1 brown, C+SC+R, r and 2-SR pale yellow, other alar veins pale almost colourless, pterostigma pallid with darker border. Variation. Body length 2.2–2.8 mm, fore wing length 2.4–3.3 mm. Propodeum of some specimens with fine rugosity inside and outside of the imaginary areola. Male. Unknown. Material examined. Holotype: 1♀, Nanling, Fuyuan, Guangdong, 2003.VII.23, Xu Zaifu, No. 20049137. Paratypes: 1♀, Tianbaoyan, Yongan, Fujian, 2001.VII.15–18, Xu Zaifu, No. 20020339; 1♀, Zhangzhou, Fujian, 1987. IV, Lin Naiquan, No. 984848; 2♀♀, Meixian, Youxi, Fujian, 1988.X.15, Lin Changfu, Nos. 20005223, 20005248; 1♀, Mt. Xiaowuyi, Fujian, 1983.VII.26–29, Ma Yun, No. 832287; 1♀, Fengxi, Meizhou, Guangdong, 2003.VII.29, Chen Jujian, No. 20048646; 1♀, Mt. Guanyin, Fogang, Guangdong, 2007.IX.15–16, Xu Zaifu, No. 200711497; 1♀, Mt. Yunji, Xinfeng, Guangdong, 2003.VII.20, Li Ping, No. 20054019; 1♀, Yinggeling, Hainan, 2007.X.18, Liu Jingxian, No. 200709818; 2♀♀, ditto, 2007.V. 28–VI.3, Weng Liqiong, Nos. 200804328, 200804137; 1♀, Wang- lang Nature Reserve, Sichuan, 2006.VII.26, Zhang Hongying, No. 200613392; 1♀, Mt. Gutian, Kaihua, Zhejiang, 1990.VII–VIII, Ma Yun, No. 905789; 1♀, ditto, 1986.VII.22, Lou Xiaoming, No. 863139; 1♀, Tiantai, Zhejiang, 1988.VIII.24, Chen Jianming, No. 888513. Distribution. China (Fujian, Guangdong, Hainan, Sichuan, Zhejiang). Etymology. The specific name " setosus " derives from the Latin, referring to pubescence on scutellum dense similar to the posterior half of the mesoscutum. Remarks. This species is similar to A. mutilia Nixon, but differs in the following: ovipositor sheath only indistinctly longer than length of hind tibia, narrow of even size (1.3×, falcate apically in latter); T1 rugose to punctate-rugulose (smooth, almost unsculptured in latter); and head above not grayish (slightly grayish owing to dense pubescence in latter).Published as part of Liu, Zhen, He, Jun-Hua, Chen, Xue-Xin & Gupta, Ankita, 2020, The ater-group of the genus Apanteles Foerster (Hymenoptera, Braconidae, Microgastrinae) from China with the descriptions of forty-eight new species, pp. 1-205 in Zootaxa 4807 (1) on pages 195-198, DOI: 10.11646/zootaxa.4807.1.1, http://zenodo.org/record/392763
Dolichogenidea hemitheae
No full textDolichogenidea hemitheae (Wilkinson, 1928) (Figs 26, 67, 70f) Apanteles hemitheae Wilkinson, 1928: 124. Holotype ♀ (examined)— Fiji [NHM, Fig. 70f]. Dolichogenidea hemitheae; Long & Belokobylskij, 2004: 385–398. Material examined (ZJUH). 1♀, Baisha, Lanxi, Zhejiang, 1985.VIII.8, Chen Xuexin, No. 852344; 2♀♀, Fengchang, Zhejiang, 1985.VIII.11, Chen Xuexin, Nos. 852304, 852269; 1♀, Mt. Wuyi, Fujian, 1988.IX.7, Lin Changfu, No. 20005679; 1♀, Conghua, Guangdong, 1978.VI, He Junhua, No. 780411; 1♀, Fuzhou, Fujian, 1991.IV.17, Liu Changming, No. 966539; 3♀♀, Nanjing, Jiangsu, 1989.X.5, Sun Yuzhen, Nos. 20004675, 20004682, 20004706; 1♀, Hangzhou, Zhejiang, 1985.VII.5, He Junhua, No. 851248; 1♀, Mt. Guanyin, Fogang, Guangdong, 2004.V.12, Xu Zaifu, No. 20053335; 1♀, Neichao, Mt. Daming, Guangxi, 2011.VIII.13, Yan Chengjin, No. 201101054. Distribution. Eastern Palaearctic [China: Jiangsu]; Oriental [China (Fujian, Guangdong, Guangxi, Taiwan, Zhejiang), Malaysia, Vietnam].Published as part of Liu, Zhen, He, Jun-Hua, Chen, Xue-Xin, Gupta, Ankita & Moghaddam, Mostafa Ghafouri, 2019, The ultor - group of the genus Dolichogenidea Viereck (Hymenoptera, Braconidae, Microgastrinae) from China with the descriptions of thirty-nine new species, pp. 1-134 in Zootaxa 4710 (1) on page 56, DOI: 10.11646/zootaxa.4710.1.1, http://zenodo.org/record/358747
Dolichogenidea hemitheae
No full textDolichogenidea hemitheae (Wilkinson, 1928) (Figs 26, 67, 70f) Apanteles hemitheae Wilkinson, 1928: 124. Holotype ♀ (examined)— Fiji [NHM, Fig. 70f]. Dolichogenidea hemitheae; Long & Belokobylskij, 2004: 385–398. Material examined (ZJUH). 1♀, Baisha, Lanxi, Zhejiang, 1985.VIII.8, Chen Xuexin, No. 852344; 2♀♀, Fengchang, Zhejiang, 1985.VIII.11, Chen Xuexin, Nos. 852304, 852269; 1♀, Mt. Wuyi, Fujian, 1988.IX.7, Lin Changfu, No. 20005679; 1♀, Conghua, Guangdong, 1978.VI, He Junhua, No. 780411; 1♀, Fuzhou, Fujian, 1991.IV.17, Liu Changming, No. 966539; 3♀♀, Nanjing, Jiangsu, 1989.X.5, Sun Yuzhen, Nos. 20004675, 20004682, 20004706; 1♀, Hangzhou, Zhejiang, 1985.VII.5, He Junhua, No. 851248; 1♀, Mt. Guanyin, Fogang, Guangdong, 2004.V.12, Xu Zaifu, No. 20053335; 1♀, Neichao, Mt. Daming, Guangxi, 2011.VIII.13, Yan Chengjin, No. 201101054. Distribution. Eastern Palaearctic [China: Jiangsu]; Oriental [China (Fujian, Guangdong, Guangxi, Taiwan, Zhejiang), Malaysia, Vietnam].Published as part of Liu, Zhen, He, Jun-Hua, Chen, Xue-Xin, Gupta, Ankita & Moghaddam, Mostafa Ghafouri, 2019, The ultor - group of the genus Dolichogenidea Viereck (Hymenoptera, Braconidae, Microgastrinae) from China with the descriptions of thirty-nine new species, pp. 1-134 in Zootaxa 4710 (1) on page 56, DOI: 10.11646/zootaxa.4710.1.1, http://zenodo.org/record/358747
Effects of microfractures on permeability in carbonate rocks based on digital core technology
Get PDFCarbonate reservoirs develop many different types of microfractures that play an important role in increasing the effective reservoir space and permeability. Thus, the qualitative and quantitative characterisation of the effect of microfractures on permeability in rocks is essential. In this study, a quantitative method for evaluating the impact of different microfracture parameters on carbonate rock permeability was proposed. Lattice Boltzmann simulations were carried on two carbonate digital cores with different types of artificially added microfractures. Based on the simulation results, a partial least squares regression analysis was used to investigate the impact of microfractures on the permeability of the cores. Increases in the fracture length, aperture, and density were found to linearly increase the permeability of the carbonate rocks, and as the fracture length increased to penetrate the whole core, an exponential increase in permeability was observed. Additionally, the effect of microfractures on the digital core permeability was more significant in cores with high permeability compared to that in low-permeability cores. Although both fractures and matrix permeability contribute to the permeability of the digital cores, the former were found to have a greater effect on the permeability.Cited as: Liu, C., Zhang, L., Li, Y., Liu, F., Martyushev, D. A., Yang, Y. Effects of microfractures on permeability in carbonate rocks based on digital core technology. Advances in Geo-Energy Research, 2022, 6(1): 86-90. https://doi.org/10.46690/ager.2022.01.0
Research of Transaction Request Handling Queueing System in the e-Business Environment Based on Queuing Theory
No full textA new approach for estimating living vegetation volume based on terrestrial point cloud data
No full textLiving vegetation volume (LVV), one of the most difficult tree parameters to calculate, is among the most important factors that indicates the biological characteristics and ecological functions of the crown. Obtaining precise LVV estimates is, however, challenging task because the irregularities of many crown shapes are difficult to capture using standard forestry field equipment. Terrestrial light detection and ranging (T-LiDAR) can be used to record the three-dimensional structures of trees. The primary branches of Larix olgensis and Quercus mongolica in the Qingyuan Experimental Station of Forest Ecology at the Chinese Academy of Sciences (CAS) were taken as the research objects. A new rapid LVV estimation method called the filling method was proposed in this paper based on a T-LiDAR point cloud. In the proposed method, the branch point clouds are divided into leaf points and wood points. We used RiSCAN PRO 1.64 to manually separate the leaf points and wood points under careful visual inspection, and calculated that leaf points and wood points accounted for 91% and 9% of the number of the point clouds of branches. Then, the equation LVV = V1N (where N is the number of leaf points, and V1 is cube size) is used to calculate LVV. When the laser transmission frequency is 300,000 points/second and the point cloud is diluted to 30% using the octree method, the point cloud can be replaced by a cube (V1) of 6.11 cm3 to fill the branch space. The results showed that good performance for this approach, the measuring accuracy for L. olgensis and Q. mongolica at the levels of α = 0.05 and α = 0.01, respectively (94.35%, 90.01% and 91.99%, 85.63%, respectively). The results suggest that the proposed method can be conveniently used to calculate the LVV of coniferous and broad-leaf species under specific scanning settings. This work is explorative because hypotheses or a theoretical framework have not been previously defined. Rather, we would like to contribute to the formation of hypotheses as a background for further studies.</div
Exact periodic solitary wave solutions for the (2+1)-dimensional Boussinesq equation
No full textAbstractExact periodic solitary wave solutions for the (2+1)-dimensional Boussinesq equation are obtained by using the extended ansätz function method. Detailed behavior of the propagation of the periodic solitary wave solutions for the (2+1)-dimensional Boussinesq equation is illustrated by using the method of figure analysis. The result shows that it is entirely possible for the (2+1)-dimensional integrable equations or non-integrable equations that there exist periodic solitary waves in the different direction. The propagation of the periodic solitary waves is actually phase shifts of solitons, and the amplitudes of non-singular periodic solitary waves depend on frequency and wave number of periodic wave
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