Publications by authors named "Hai-Xia Ma"

12 Publications

  • Page 1 of 1

Global Phylogeny and Taxonomy of the Wood-Decaying Fungal Genus (Polyporales, Basidiomycota).

Front Microbiol 2021 10;12:622460. Epub 2021 Feb 10.

Beijing Museum of Natural History, Beijing, China.

An in-depth study of the phylogeny and taxonomy of the corticioid genus (Phanerochaetaceae) was conducted. Phylogenetic analyses of the ITS1-5.8S-ITS2 and nrLSU sequences demonstrated that is a strongly supported clade which is distinct from its sister clades of , , and . Two genera, and , are reduced to synonyms under as generic type species and , respectively, are embedded in the clade. Twenty-four lineages are resolved in the ITS phylogenetic tree of , including six new taxa, viz. , , , , and , from Sri Lanka and China. Five new combinations, viz. , , , and , are proposed. is a morphological species complex with three distinct lineages. is determined to be a later synonym of . The new taxa are described, illustrated, and compared and contrasted to morphologically similar species. An emended description of is provided along with an identification key to 27 accepted species.
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http://dx.doi.org/10.3389/fmicb.2021.622460DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7902713PMC
February 2021

Four new corticioid species in Trechisporales (Basidiomycota) from East Asia and notes on phylogeny of the order.

MycoKeys 2019 8;48:97-113. Epub 2019 Mar 8.

Institute of Microbiology, Beijing Forestry University, Beijing 100083, China Beijing Forestry University Beijing China.

Four new species in Trechisporales from East Asia, , , and , are described and illustrated, based on morphological and molecular evidence. The phylogeny of Trechisporales was inferred from a combined dataset of ITS-nrLSU sequences. In the phylogenetic tree, formed a family-level clade of its own, sister to the Hydnodontaceae clade formed by all other genera. , is for the first time, confirmed as a member of Hydnodontaceae. A key to all the accepted genera in Trechisporales is given.
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http://dx.doi.org/10.3897/mycokeys.48.31956DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6420480PMC
March 2019

Activities of Endogenous Lipase and Lipolysis Oxidation of Low-Salt Lactic Acid-Fermented Fish (Decapterus maruadsi).

J Oleo Sci 2018 Apr 9;67(4):445-453. Epub 2018 Mar 9.

South China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences; Key Lab of Aquatic Product Processing of Ministry of Agriculture.

There is increasing demand for low-salt meat products that retain traditional flavors. In this study, dry-salted fish (Decapterus maruadsi) were processed by 2 methods to obtain traditional salted fish (HS) and low-salt lactic acid-fermented fish (LAF). The relationship between lipolysis and lipid oxidation was investigated by evaluating changes in endogenous lipase (lipolytic enzymes; lipoxygenase, LOX), free fatty acid composition, thiobarbituric acid reactive substances (TBARS), and peroxide value (POV) during processing. Lipolytic enzyme activity showed a decreasing trend, in general. LOX activity initially increased and eventually decreased. Phospholipase, acid lipase, and neutral lipase activity was 0.33, 0.17, 0.57 (in HS) and 0.39, 0.25, 0.67 (in LAF) times in the final product than the activity levels observed in fresh fish. A principal component analysis indicated that phospholipase and neutral lipase play major roles in promoting lipid hydrolysis (in HS and LAF), the correlation between lipolytic activity and lipid oxidation in HS is greater than the correlation in LAF, and the contribution of LOX to lipid oxidation was minor in salted fish.
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http://dx.doi.org/10.5650/jos.ess17176DOI Listing
April 2018

Prevalence and Treatment of Children's Asthma in Rural Areas Compared with Urban Areas in Beijing.

Chin Med J (Engl) 2015 Sep;128(17):2273-7

Center for Asthma Prevention and Education, Capital Institute of Pediatrics, Beijing 100020, China.

Background: The prevalence of childhood asthma has been increasing in China. This study aimed to compare the prevalence, diagnosis, and treatment of asthmatic children from urban and rural areas in Beijing, China.

Methods: Schools, communities, and kindergartens were randomly selected by cluster random sampling from urban and rural areas in Beijing. Parents were surveyed by the same screening questionnaires. On-the-spot inquiries, physical examinations, medical records, and previous test results were used to diagnose asthmatic children. Information on previous diagnoses, treatments, and control of symptoms was obtained.

Results: From 7209 children in rural areas and 13,513 children in urban areas who completed screening questionnaires, 587 children were diagnosed as asthma. The prevalence of asthma in rural areas was lower than in urban areas (1.25% vs. 3.68%, χ2 = 100.80, P < 0.001). The diagnosis of asthma in rural areas was lower than in urban areas (48.9% vs. 73.9%, χ2 = 34.6, P < 0.001). Compared with urban asthmatic children (56.5%), only 35.6% of rural asthmatic children received inhaled corticosteroids (P < 0.05). The use of bronchodilators was also lower in rural areas than in urban areas (56.5% vs. 66.4%, χ2 = 14.2, P < 0.01).

Conclusion: The prevalence of asthma in children was lower in rural areas compared with children in the urban area of Beijing. A considerable number of children were not diagnosed and inadequately treated in rural areas.
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http://dx.doi.org/10.4103/0366-6999.163381DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4733796PMC
September 2015

1-[6-(3,5-Di-methyl-pyrazol-1-yl)-1,2,4,5-tetra-zin-3-yl]guanidin-2-ium perchlorate methanol monosolvate.

Acta Crystallogr Sect E Struct Rep Online 2013 27;69(Pt 8):o1332. Epub 2013 Jul 27.

School of Chemical Engineering, Northwest University, Xi'an 710069, Shaanxi, People's Republic of China.

In the title solvated salt, C8H12N9 (+)·ClO4 (-)·CH3OH, the dihedral angle between the tetra-zine and pyrazole rings is 26.05 (7)°. The two N atoms bonded to the 1,2,4,5-tetra-zine ring deviate from the plane defined by its four N atoms by 0.234 (2) and 0.186 (2) Å. There is an intra-molecular N-H⋯N hydrogen bond between the protonated guanidine fragment and one of the tetra-zine N atoms. In the crystal, two cations and two perchlorate anions are connected via N-H⋯O hydrogen bonds into centrosymmetric assemblies. These assemblies are further linked into a two-dimensional network parallel to (100) via bifurcated O-H⋯(N,N) hydrogen bonds formed with the bridging methanol mol-ecules.
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http://dx.doi.org/10.1107/S1600536813020448DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3793816PMC
October 2013

3,3-Dinitro-azetidinium chloride.

Acta Crystallogr Sect E Struct Rep Online 2012 Dec 17;68(Pt 12):o3376. Epub 2012 Nov 17.

School of Chemistry and Chemical Engineering, Yulin University, Yulin 719000 Shaanxi, People's Republic of China ; School of Chemical Engineering, Northwest University, Xi'an 710069 Shaanxi, People's Republic of China.

In the title gem-dinitro-azetidinium chloride salt, C3H6N3O4(+)·Cl(-), the cations and anions lie on a mirror plane. The azetidine ring is virtually planar, with a mean deviation from the plane of 0.0569 Å. The dihedral angle between the two nitro groups is 90.00 (5)°. In the crystal, the ions are linked by N-H⋯Cl interactions, forming a chain along the c-axis direction, and C-H⋯O inter-actions, forming a layer parallel to (010).
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http://dx.doi.org/10.1107/S1600536812046302DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3588972PMC
December 2012

Three new lanostanoid triterpenes from the fruiting bodies of Ganoderma tropicum.

J Asian Nat Prod Res 2013 19;15(4):357-62. Epub 2013 Feb 19.

MOA Key Laboratory of Tropical Crop Biology and Genetic Resources Utilization, Institute of Tropical Bioscience and Biotechnology, CATAS, Haikou 571101, China.

Three new lanostanoid triterpenes, 3β,7β,15β-trihydroxy-11,23-dioxo-lanost-8,16-dien-26-oic acid (1), 3β,7β,15β-trihydroxy-11,23-dioxo-lanost-8,16-dien-26-oic acid methyl ester (2), and 3β,15β-dihydroxy-7,11,23-trioxo-lanost-8,16-dien-26-oic acid methyl ester (3) were isolated from the EtOAc extract of the fruiting bodies of Ganoderma tropicum. Their structures were elucidated on the basis of 1D and 2D NMR spectroscopy as well as MS. The bioassay of inhibitory activity against acetylcholinesterase (AChE) of these isolates was evaluated and compound 2 exhibited definite inhibitory activity against AChE.
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http://dx.doi.org/10.1080/10286020.2013.764869DOI Listing
July 2013

1-Benzoyl-3,3-dinitro-azetidine.

Acta Crystallogr Sect E Struct Rep Online 2009 Dec 4;66(Pt 1):o57. Epub 2009 Dec 4.

In the title gem-dinitro-azetidine derivative, C(10)H(9)N(3)O(5), the azetidine ring is almost planar, the maximum value of the endocyclic torsion angle being 0.92 (14)°. The gem-dinitro groups are mutually perpendicular and the dihedral angle between the azetidine and benzene rings is 46.70 (10)°
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http://dx.doi.org/10.1107/S1600536809051290DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2980018PMC
December 2009

1-(2,4-Dinitro-phen-yl)-3,3-dinitro-azetidine.

Acta Crystallogr Sect E Struct Rep Online 2009 Nov 25;65(Pt 12):o3215. Epub 2009 Nov 25.

In the title compound, C(9)H(7)N(5)O(8), the dihedral angle between the mean plane of the azetidine ring and that of the benzene ring is 26.1 (1)°; the planes of the two nitro groups of the azetidine ring are aligned at 88.7 (1)°.
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http://dx.doi.org/10.1107/S1600536809049861DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2971829PMC
November 2009

Nonisothermal decomposition kinetics and computational studies on the properties of 2,4,6,8-tetranitro-2,4,6,8-tetraazabicyclo[3,3,1]onan-3,7-dione (TNPDU).

J Phys Chem A 2007 Sep 15;111(35):8642-9. Epub 2007 Aug 15.

College of Chemical Engineering/Shaanxi Key Laboratory of Physico-Inorganic Chemistry, Northwest University, Xi'an, Shaanxi, 710069, People's Republic of China.

The thermal decomposition and the nonisothermal kinetics of the thermal decomposition reaction of 2,4,6,8-tetranitro-2,4,6,8-tetraazabicyclo[3,3,1]onan-3,7-dione (TNPDU) were studied under the nonisothermal condition by differential scanning calorimetry (DSC) and thermogravimetry-derivative thermogravimetry (TG-DTG) methods. The kinetic model function in differential form and the value of Ea and A of the decomposition reaction of TNPDU are f(alpha) = 3(1 - alpha)[-ln(1 - alpha)](2/3), 141.72 kJ mol(-1), and 10(11.99) s(-1), respectively. The critical temperature of thermal explosion of the title compound is 232.58 degrees C. The values of DeltaS(++), DeltaH(++), and DeltaG(++) of this reaction are -15.50 J mol(-1) K(-1), 147.65 kJ mol(-1), and 155.26 kJ mol(-1), respectively. The theoretical investigation on the title compound as a structure unit was carried out by the DFT-B3LYP/6-311++G** method. The IR frequencies and NMR chemical shift were performed and compared with the experimental results. The heat of formation (HOF) for TNPDU was evaluated by designing isodesmic reactions. The detonation velocity (D) and detonation pressure (P) were estimated by using the well-known Kamlet-Jacobs equation, based on the theoretical densities and HOF. The calculation on bond dissociation energy suggests that the N-N bond should be the trigger bond during the pyrolysis initiation process.
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http://dx.doi.org/10.1021/jp073092oDOI Listing
September 2007

The nonopsonic allogeneic cell phagocytosis of macrophages detected by flow cytometry and two photon fluorescence microscope.

Transpl Immunol 2006 Nov 10;16(3-4):220-6. Epub 2006 Oct 10.

Transplantation Biology Research Division, State Key Laboratory of Biomembrane and Membrane Biotechnology, Institute of Zoology, Chinese Academy of Sciences, Beijing, China.

Phagocytosis, one of the apparent functions for macrophages, represents an early and crucial event in triggering host defenses against invading pathogens as well as allo- or xenogeneic rejection. Now, some methods have been used in detecting the opsonic phagocytosis of macrophages in xenogeneic settings. Efficient nonopsonic phagocytosis analysis method has not been established yet. In the present studies, allogeneic lymphocytes pre-labeled with 5-(and-6)-carboxyfluorescein diacetate succinimidyl ester (CFSE) or derived from green fluorescent protein transgeneic B6 mice (GFP-B6 mice) were co-incubated with primary murine peritoneal macrophages (PEMs) for 1-2 h or were injected into murine peritoneal cavity for 30 to 240 min. Assays by flow cytometry (FCM) and two photon laser scanning microscope (TPM) showed an efficient uptake of both allogeneic lymphocytes and xenogeneic chicken red blood cells. The continuing process of nonopsonic phagocytosis of allogeneic lymphocytes by PEMs was recorded by TPM. Furthermore, the phenotype differences of PEMs with or without phagocytosis of allogeneic cells were determined by three-color FCMs. Significantly upregulated expressions of CD11b, CD44, TLR2 and TLR4 on PEMs were observed as early as 6 h after phagocytosis of allogeneic cells. Our present data indicated that the FCM and TPM combined method is a practical approach to detect macrophage nonopsonic phagocytosis of allogeneic lymphocytes and to identify the phenotype alteration of macrophages after phagocytosis.
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http://dx.doi.org/10.1016/j.trim.2006.09.023DOI Listing
November 2006