检索结果-南通市图书馆

《美国儿童鼓膜置管临床实践指南概要(更新版)》摘译

在线全文

学校读者我要写书评

暂无评论

听力学及言语疾病杂志 2024年第1期32卷 89-91页

作者：韩继波(译) 曹永茂(审校) 武汉大学人民医院耳鼻咽喉头颈外科武汉430060

鼓膜置管主要用于治疗持续的中耳积液、反复的中耳感染、或者中耳感染药物不能控制的患儿。儿童鼓膜置管临床指南(2022)概要是对2013年美国耳鼻咽喉头颈外科学会“儿童鼓膜置管临床指南”的更新,是对近十年来新的临床研究和循证医学证... 详细信息

鼓膜置管主要用于治疗持续的中耳积液、反复的中耳感染、或者中耳感染药物不能控制的患儿。儿童鼓膜置管临床指南(2022)概要是对2013年美国耳鼻咽喉头颈外科学会“儿童鼓膜置管临床指南”的更新,是对近十年来新的临床研究和循证医学证据的进一步总结。

关键词：耳鼻咽喉头颈外科学鼓膜置管临床指南中耳积液临床实践指南循证医学证据更新版概要

Effect of Strain Rate on Hydrogen Embrittlement Behaviour of Amorphous NiCrFeSiB Alloy

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 1996年第2期12卷 105-108页

作者： Zuo, Y Latanision, rm MIT CAMBRIDGEMA 02139

The effect of strain rate on hydrogen embrittlement behaviour of amorphous Ni-6.6Cr-2.6Fe-7.8Si-14.5B (at pct) alloy in 0.1 mol/L H2SO4 solution was studied by the methods of slow strain rate test and electrochemical charging. The results show that fracture stress of the alloy decreases with the decrease of strain rate within a certain range. As a tentative explanation, the effect of strain rate on hydrogen embrittlement fracture stress was attributed to the interaction between hydrogen and the excess volume in amorphous alloys.

关键词： Amorphous alloys

Bioaccumulation and depuration of chromium in the selected organs and whole body tissues of freshwater fish Cirrhinus mrigala individually and in binary solutions with nickel

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2009年第2期21卷 229-236页

作者： PL.rm.Palaniappan S.Karthikeyan Department of Physics Annamalai University Department of Physics St.Joseph College of Engineering

Contamination of aquatic ecosystems with heavy metals has been receiving increased worldwide attention due to their harmful effects on human health and other organisms in the environment. Most of the studies dealing with toxic effects of metals deal with single metal species, while the aquatic organisms are typically exposed to mixtures of metals. Hence, in order to provide data supporting the usefulness of freshwater fish as indicators of heavy metal pollution, it has been proposed in the present study to investigate the bioaccumulation and depuration of chromium in the selected organs of freshwater fingerlings Cirrhinus mrigala, individually and in binary solutions with nickel. The results show that the kidney is a target organ for chromium accumulation, which implies that it is also the ＂critical＂ organ for toxic symptoms. The results further show that accumulation of nickel in all the tissues of C. mrigala is higher than that of chromium. In addition, the metal accumulations of the binary mixtures of chromium and nickel are substantially higher than those of the individual metals, indicating synergistic interactions between the two metals. Theoretically the simplest explanation for an additive joint action of toxicants in a mixture is that they act in a qualitatively similar way. The observed data suggest that C. mrigala could be suitable monitoring organisms to study the bioavailability of water-bound metals in freshwater habitats.

关键词： freshwater fish Cirrhinus mrigala bioaccumulation metal mixtures synergism

Intracellular Metabolite Transporters in Plants

在线全文

学校读者我要写书评

暂无评论

Molecular Plant 2010年第1期3卷 21-53页

作者： Nicole Linka Andreas rm. Weber Institute of Plant Biochemistry Heinrich-Heine Universit~t D0sseldorf Geb. 26.03.01 Universitsstsstrasse 1 40225 Dasseldorf Germany

Due to the presence of plastids, eukaryotic photosynthetic cells represent the most highly compartmentalized eukaryotic cells. This high degree of compartmentation requires the transport of solutes across intracellular membrane systems by specific membrane transporters. In this review, we summarize the recent progress on functionally characterized intracellular plant membrane transporters and we link transporter functions to Arabidopsis gene identifiers and to the transporter classification system. In addition, we outline challenges in further elucidating the plant membrane permeome and we provide an outline of novel approaches for the functional characterization of membrane transporters.

关键词： Membrane biochemistry molecular transport transporters membrane proteins.

Proteomic Analysis of the Proplastid Envelope Membrane Provides Novel Insights into Small Molecule and Protein Transport across Proplastid Membranes

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Molecular Plant 2009年第6期2卷 1247-1261页

作者： Andrea Brautigam Andreas rm. Weber Institut fur Biochemie der Pflanzen Heinrich Heine Universitat Universitatsstrasse 1 D-40225 Dusseldorf Germany Genetics Program Michigan State University East Lansing MI USA Department of Plant Biology Michigan State University East Lansing MI USA

Proplastids are undifferentiated plastids of meristematic tissues that synthesize amino acids for protein synthesis, fatty acids for membrane lipid production, and purines and pyrimidines for DNA and RNA synthesis. Unlike chloroplasts, proplastids depend on supply, with reducing power, energy, and precursor metabolites from the remainder of the cell. Comparing proplastid and chloroplast envelope proteomes and the corresponding transcriptomes of leaves and shoot apex revealed a clearly distinct composition of the proplastid envelope. It is geared towards import of metabolic precursors and export of product metabolites for the rapidly dividing cell. The analysis also suggested a new role for the triosephosphate translocator in meristematic tissues, identified the route of organic nitrogen import into proplastids, and detected an adenine nucleotide exporter. The protein import complex contains the import receptors Toc120 and Toc132 and lacks the redox sensing complex subunits of Tic32, Tic55, and Tic62, which mirrors the expression patterns of the corresponding genes in leaves and the shoot apex. We further show that the protein composition of the internal membrane system is similar to etioplasts, as it is dominated by the ATP synthase complex and thus remarkably differs from that of chloroplast thylakoids.

关键词： Membrane biochemistry proteomics transporters chloroplast biology membrane proteins transcriptome analysis.

Endoscopic treatment of non-variceal gastrointestinal bleeding:hemoclips and other hemostatic techniques

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2000年第1期6卷 42-44页

作者： Moura rm Barkin JS University of Miami School of Medicine & Mount Sinai Medical Center Division of GastroenterologyMiamiFloridaUSA

Although the number of hospitalizations for non-variceal gastrointestinal bleeding has decreased inrecent years,acute upper gastrointestinalhemorrhage continues to be a common reason forhospital admission,and peptic ulcers account for atleast fifty percent of all *** the fact thatbleeding from ulcers ceases spontaneously inapproximately 80% of patients,it is still a

关键词： Subject headings gastrointestinal bleeding/therapy endoscopic/therapy hemoclip/therapy hemostatic technique

Synthesis and structural characterization of a new trimetallic thiocubane cluster

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Chemistry 1997年第2期15卷 114-122页

作者： Yu, rm Lu, SF Huang, XY Huang, JQ CHINESE ACAD SCI FUJIAN INST RES STRUCT MATTERFUZHOU 350002FUJIANPEOPLES R CHINA

The trimetallic cluster W2CuAgS4(TDT)(2)(PPh3)(2) . CH2Cl2 (TDT=[S-2(C6H3)CH3](2-)) (2) has been prepared from the reaction of the well-defined molecule building block [W2S4(TDT)(2)](2-) (1) with AgNO3, CuBr and PPh3. The structure contains a [W2CuAgS4](4+) distorted cubane-like core, Two types of metal-metal bonds exist in the core, One is W-W bond of which length is 0.2871(1) nm, the other is W-M' (M'=Cu or Ag) bends, whose mean distance is 0.2980 nm. The details of synthesis, structure, IR, UV-Vis and P-31 NMR spectra are reported. The crystallographic data are: space group P2(1)/n, with a=1.6987(4), b=1.7763(6), c=1.8918(5) nm, beta=98.54(2)degrees, V=5.645(3) nm(3), Z=4, and final R=0.043 for 6437 observed reflections.

关键词： W-Cu-Ag-S cubane-like cluster structure synthesis

Synthesis and Properties of Layered Oxides LiCo_(1-x)Ni_xO_2

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 1997年第5期13卷 405-408页

作者： Lin, Q Chen, N Ye, W Liu, rm Luo, JS GEN RES INST NONFERROUS MET BEIJING 100088PEOPLES R CHINA

The mechanism of LiCo1－xNixO2(x=0, 0.5, 1) synthesis from carbonates or hydrates was studied by thermogravimetric analysis and X-ray diffraction to identify the medium and final products. The synthesis process from carbonates can be divided into two steps. Below 300℃cobalt carbonate and/or nickel carbonate decompose forming oxides. Over 300℃ Li2CO3 decomposes and reacts with Co and/or Ni oxides gradually, as a result Co++ and/or Ni++ areoxidized to Co+++ and/or Ni+++, finally LiCo1-xNixO2 forms. The proportion of cobalt tonickel in the starting mixture and atmosphere during synthesis affects the structure of ***1-xNixO2(x≤0.5) can be synthesized in air or oxygen and characterized by solid solutionof LiCoO2 and LiNiO2. LiNiO2 can be obtained only from hydrates and in oxygen *** and LiCo0.5Ni0.5O2 have higher first charge capacity than that of LiCoO2. Their discharge capacity reaches a level with that of LiCoO2 and has reasonable reversibility.

关键词： Lithium batteries

The soil fungi producing siderophores of ***,Tawang,La Trinidad,Benguet

在线全文

学校读者我要写书评

暂无评论

Studies in Fungi 2019年第1期4卷 1-13页

作者： Hipol rm Baldelomar JA Bolinget KC Solis AFF Department of Biology College of ScienceUniversity of the Philippines Baguio

Siderophores,being iron-chelators,have received much attention in environmental research,medicine,and biotechnology because of their high affinity and specificity to a wide range of *** study aimed to investigate siderophore production of culturable soil fungi from ***,Tawang,La Trinidad,Benguet and to determine their chemical *** production was detected and quantified using Chrome Azurol Sulphonate assay while the siderophore characterization was through FeCl_(3),Csáky’s and Arnow’s *** was found that 11 out of 20 pure cultures,which showed positive CAS assay results,produce *** primers were used in PCR amplification for the molecular identification of the top-four *** on BLASTn analyses of their sequences,the isolates were found to be most homologous to species of Talaromyces,Byssochlamys,Paecilomyces,and *** identified species were subjected to phylogenetic analysis using MEGA 7 to the show evolutionary history and relationship among the fungal species.

关键词： CAS assay hydroxamates iron chelators