检索结果-南通市图书馆

Structural and chemical changes in pyrogenic organic matter aged in a boreal forest soil

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Pedosphere 2023年第3期33卷 436-447页

作者： Jari HYVÄLUOMA Arttu miettinen Riikka KESKINEN Kimmo RASA Henrik LINDBERG Häme University of Applied Sciences Mustialantie 105Mustiala FI-31310(Finland) Department of Physics University of JyväskyläP.O.Box 35JyväskyläFI-40014(Finland) Natural Resources Institute Finland Tietotie 4Jokioinen FI-31600(Finland) Häme University of Applied Sciences Visamäentie 35 AP.O.Box 230Hämeenlinna FI-13101(Finland)

Pyrogenic organic matter(PyOM)is formed during wildfires and prescribed burnings or produced intentionally in the form of biochar for soil amendment *** is attracting a growing scientific and practical interest due to its important role in the global carbon cycle and agronomic applications as a soil *** of the studies on the physicochemical properties of PyOM have been conducted using fresh biochars even though the characteristics of PyOM are expected to alter due to aging processes in soil *** this paper,we report the results of a study that utilized X-ray microtomography and elemental analysis to investigate the chemical and structural changes in the PyOM formed during prescribed burning events and aged thereafter for 1–71 years in a boreal forest *** results indicate that changes in elemental composition occurred at decadal timescales,and an apparent steady state was reached ca.30 years after PyOM formation and exposure to the *** such timescales,PyOM was able to retain its porous structure originating from the cellular structure of the initial wood ***,structural analysis revealed several effects of aging on the pore structure,such as the formation of surface coating layers,pore fillings,and *** changes may alter pore size distribution and accessibility of the pores and further alter the influence of PyOM on soil functions,such as the transfer and retention of water and nutrients in PyOM pores.

关键词： biochar charcoal chronosequence porosity prescribed burning soil amendment X-ray microtomography

维普期刊数据库

Seasonal variations of acute appendicitis and nonspecific abdominal pain in Finland

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2014年第14期20卷 4037-4042页

作者： Imre Ilves Anne Fagerstrm Karl-Heinz Herzig Petri Juvonen Pekka miettinen Hannu Paajanen Department of Surgery Kuopio University Hospital Institute of Biomedicine Division of Physiology and Biocenter of OuluUniversity of Oulu Department of Psychiatry Kuopio University Hospital

AIM: To investigate whether seasonal changes had an effect on the incidence of acute appendicitis (AA) or nonspecific abdominal pain (NSAP).

关键词： Acute appendicitis Appendectomy Nonspecific abdominal pain Incidence Seasonal Temperature Humidity

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

中国产丝齿菌属的研究小记(英文)

菌物学报 2007年第2期26卷 165-170页

作者：熊红霞戴玉成 Otto miettinen 中国科学院沈阳应用生态研究所赫尔辛基大学植物博物馆

对中国产丝齿菌属Hyphodontia的种类进行了研究,并记录了30个种。其中弯孢产丝齿菌Hyphodontia curvispora是中国的新记录种,热带产丝齿菌Hyphodontia tropica是首次在中国大陆的报道。根据作者的采集标本对这两个种进行了详细的描述和... 详细信息

对中国产丝齿菌属Hyphodontia的种类进行了研究,并记录了30个种。其中弯孢产丝齿菌Hyphodontia curvispora是中国的新记录种,热带产丝齿菌Hyphodontia tropica是首次在中国大陆的报道。根据作者的采集标本对这两个种进行了详细的描述和显微结构绘图,同时还给出了中国产丝齿菌属30个种的检索表。

关键词：木腐菌伏革菌分类学

维普期刊数据库

Probiotic Leuconostoc mesenteroides ssp. cremoris and Streptococcus thermophilus induce IL-12 and IFN-γ production

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2008年第8期14卷 1192-1203页

作者： Riina A Kekkonen Elina Kajasto Minja miettinen Ville Veckman Riitta Korpela Ilkka Julkunen University of Helsinki Institute of Biomedicine Pharmacology PO Box 63 Helsinki 00014 Finland Valio Ltd Research Centre Meijeritie 4 00370 Helsinki Finland National Public Health Institute Department of Viral Diseases and Immunology Mannerheimintie 166 Helsinki 00300 Finland University of Helsinki Institute of Biomedicine Pharmacology PO Box 63 Helsinki 00014 Finland Foundation for Nutrition Research PO Box 30 Valio 00039 Finland Valio Ltd Research Centre Meijeritie 4 00370 Helsinki

AIM： To investigate the capacity of potentially probiotic strains from six bacterial genera to induce cytokine production alone or in combinations in order to identify potential enhancing or synergistic effects in order to select probiotic bacteria for in vivo purposes.METHODS： Cytokine production in human peripheral blood mononuclear cells （PBMC） in response to stimulation with eleven different potentially probiotic bacterial strains from Streptococcus, Lactobacillus, Bifidobacterium, Lactococcus, L euconostoc a n d Propionibacterium genera was analysed. Production and mRNA expression of TNF-α, IL-12, IFN-y and IL-10 were determined by ELISA and Northern blotting, respectively.RESULTS： All tested bacteria induced TNF-α production. The best inducers of Thl type cytokines IL-12 and IFN-y were Streptococcus and Leuconostoc strains. All BiHdobacterium and Propionibacterium strains induced higher IL-IO production than other studied bacteria. Stimulation of PBMC with any bacterial combinations did not result in enhanced cytokine production suggesting that different bacteria whether gram-positive or gram- negative compete with each other during host cell interactions.CONCLUSION： The probiotic S. thermophilus and Leuconostoc strains are more potent inducers of Thl type cytokines IL-12 and IFN-γ than the probiotic Lactobacillus strains. Bacterial combinations did not result in enhanced cytokine production.

关键词： Probiotics Streptococcus Lactobacillus Bifidobacterium lactococcus leuconostoc Propionibacterium Immune response Cytokines Mononuclear cells

Hydraulically Powered Wood Chip Blower in Test and Its Use Opportunity in Biofuel Supply Chain

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Sustainable Bioenergy Systems 2020年第3期10卷 77-91页

作者： Jarno Föhr Raghu KC Tapio Ranta Markku miettinen Laboratory of Bioenergy Lappeenranta-Lahti University of Technology LUT Mikkeli Finland Lä mpö si Oy Jyv&#228 skylä Finland

Most forest chips are delivered to large-sized, combined heat and power plants in Finland. In this study, we introduce and demonstrate the small-scale delivery of forest wood chips to potential clients, with the wood chips being delivered in a container truck and pneumatically blown into a storage facility. This arrangement of wood chips being blown through a pipe into a storage eliminates the ground handling while requiring a relatively small space. In the demonstration tests, we tested the volumetric flow of biomass in the hose and its noise level while the blower was blowing the material and the flow speed of the material in the hose. This study discusses the test conditions in which the compatibility and suitability of the truck and its hydraulic system were used in conventional chip delivery in Finland and the selected blower type was investigated. According to the results, the biomass volume flow was higher (~0.46 m3/min) when the blower revolution was lower (2392 - 2566 RPM). However, when the RPM was increased to ~3000, the volumetric flow decreased to ~0.24 m3/min. Similarly, the speed of the chips was higher with a lower RPM;29.9 m/s at an RPM of 2400 and 25 m/s at an RPM of 2700. This is potentially due to both the blower and screw conveyer using the same power source. Additional optimization research would be needed to conclusively state the root cause of this phenomenon. On the other hand, chips from pruned stems had better flow than the chips from whole trees, since chips from whole tree have a wider range of chips sizes, including 1.3% of chips being in the range of 31.5 - 40 mm. The larger chips clogged the hose, which hindered the flow. Finally, the noise tests showed that it was louder at 0 degrees, which contrasted with the situation for the blower, with an aside at 90 degrees.

关键词： Truck Blower System Test Biomass Supply Chain

Human dental pulp stem cells differentiate into neural precursors but not into mature functional neurons

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Stem Cell Discovery 2012年第3期2卷 85-91页

作者： Riikka Aanismaa Jenna Hautala Annukka Vuorinen Susanna miettinen Susanna Narkilahti Adult Stem Cell Group Institute of Biomedical Technology University of Tampere Tampere Finland Neuro Group Institute of Biomedical Technology University of Tampere Tampere Finland

Large numbers of neuronal cells are needed for regenerative medicine to treat patients suffering from central nervous system diseases and deficits such as Parkinson’s disease and spinal cord injury. One suggestion has been the utilization of human dental pulp stem cells (hDPSCs) for production of neuronal cells which would offer a patient-specific cell source for these treatments. Neuronal differentiation of hDPSCs has been described previously. Here, we tested the differentiation of DPSCs into neuronal cells with previously reported protocol and characterized the cells according to their morphology, gene and protein expressions and most importantly according to their spontaneous electrical functionality with microelectrode array platform (MEA). Our results showed that even though hDPSC-derived neural progenitor stage cells could be produced, these cells did not mature further into functional neuronal cells. Thus, utilization of DPSCs as a cell source for producing grafts to treat neurological deficits requires more efforts before being optimal.

关键词： Dental Pulp Stem Cell Neural Differentiation Neural Networks

Probiotic Lactobacillus rhamnosus downregulates FCER1 and HRH4 expression in human mast cells

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 2011年第6期17卷 750-759页

作者： Anna Oksaharju Matti Kankainen Riina A Kekkonen Ken A Lindstedtt Petri T Kovanen Riitta Korpela Minja miettinen Wihuri Research Institute VTT Technical Research Centre of Finland Biosystems Modelling Valio Ltd Research Centre University of Helsinki Institute of BiomedicineMedical Nutrition Physiology National Institute for Health and Welfare Department of Vaccines and Immune Protection

AIM:To investigate the effects of four probiotic bacteria and their combination on human mast cell gene expression using microarray ***:Human peripheral-blood-derived mast cells were stimulated with Lactobacillus rhamnosus (***) GG (LGG),*** Lc705 (Lc705),Propionibacterium freudenreichii *** JS (PJS) and Bifidobacterium animalis *** Bb12 (Bb12) and their combination for 3 or 24 h,and were subjected to global microarray analysis using an Affymetrix GeneChip Human Genome U133 Plus 2.0 *** gene expression differences between unstimulated and bacteria-stimulated samples were further analyzed with GOrilla Gene Enrichment Analysis and Visualization Tool and MeV Multiexperiment ***:LGG and Lc705 were observed to suppress genes that encoded allergy-related high-affinity IgE receptor subunits α and γ (FCER1A and FCER1G,respectively) and histamine H4 ***,Lc705 and the combination of four probiotics had the strongest effect on the expression of genes involved in mast cell immune system regulation,and on several genes that encoded proteins with a pro-inflammatory impact,such as interleukin (IL)-8 and tumour necrosis factor *** genes that encoded proteins with anti-inflammatory functions,such as IL-10,were ***:Certain probiotic bacteria might diminish mast cell allergy-related activation by downregulation of the expression of high-affinity IgE and histamine receptor genes,and by inducing a pro-inflammatory response.

关键词： Probiotic bacteria Mast cells Microarray Allergy IgE receptor

青贮饲料品质对奶牛采食量和适口性影响的估算

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

饲料广角 1992年第6期 39-40页

作者： H.miettinen J.Setala 王杰

引言对于干物质(DM)含量较低的青贮饲料,青贮发酵产物通常是决定采食量大小的最重要的因素(Gill 等,1988)。现已发现:随着青贮发酵产物增加,青贮饲料采食量就会降低(Ettala 等1975,Ettala 和Lampil a 1987,Heikkila 等1989)。新

关键词：采食量适口性青贮饲料青绿饲料奶牛

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

重金属在生物体中的蓄积和排泄

环境科学研究 1978年第3期 61-64页

作者： J.K.miettinen 汤鸿霄

前言重金属这一名词,至少在生物学文献中,我们一般理解为铁及密度更大的各金属。这类金属中的某些对许多生物是必需的,例如铁、锰、铜、钴和锌,而另外一些则分别是非必需的、有害的或完全有毒的。但是,'必需'这一概念是经常不变的,而'有... 详细信息

前言重金属这一名词,至少在生物学文献中,我们一般理解为铁及密度更大的各金属。这类金属中的某些对许多生物是必需的,例如铁、锰、铜、钴和锌,而另外一些则分别是非必需的、有害的或完全有毒的。但是,'必需'这一概念是经常不变的,而'有害'和'有毒'则对不同生物和浓度有广泛的变化。所有的重金属,在达到某种曝露和吸收水平时,

关键词：生物学文献类金属生物半衰期吸收水水生食物链摄取量有毒的浓缩系数污染区域离子溶液

维普期刊数据库