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Search Results: 1 - 10 of 420104 matches for " J.H. Chang "
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Exploring laser-guided metal deposition through a microbe metabolite
H. Hocheng,K.E. Chang,J.H. Chang,J.C. Wang
Journal of Achievements in Materials and Manufacturing Engineering , 2009,
Abstract: Purpose: The purpose of the paper is to describe exploring laser-guided metal deposition through a microbe metabolite.Design/methodology/approach: A maskless micro-fabrication of laser-guided deposition process through the metabolite of Acidophilic bacteria Thiobacillus ferrooxidans (T.f.) is explored.Findings: The authors have conducted an analysis of the metal deposition process using the point thermal-source of the Nd:YAG laser through the metabolite of Acidophilic bacteria Thiobacillus. An analytical model adopting the moving point heat source on the substrate and heat transfer conditions is presented. The thermal field generated by the laser input energy is investigated.Practical implications: Though the mechanism of the laser-assisted deposition process is not fully revealed by biologist yet, the current model provides a means of control of the line deposition of metals.Originality/value: Based on the fundamental knowledge of how the line width varies with laser power and scanning speed, more investigation of the mini-scale heat convection and the threshold temperature of chemical reaction is expected in the future for further understanding of this novel metal deposition method triggered and written by laser.
An immunohistochemical study of the pancreatic endocrine cells of the Korean golden frog, Rana plancyi chosenica
H.S. Lee,J.H. Chang,S.K. Ku
European Journal of Histochemistry , 2012, DOI: 10.4081/ejh.2012.e5
Abstract: The regional distribution and quantitative frequency of pancreatic endocrine cells were demonstrated in the Korean golden frog (Rana plancyi chosenica Okada), which is known as a Korean endemic species, for the first time, by immunohistochemical methods using specific mammalian antisera to insulin, glucagon, somatostatin and human pancreatic polypeptide (PP). In the pancreas of the Korean golden frog, all four endocrine cell types were demonstrated. Insulin- and glucagon-positive cells were located in the pancreas as single cells or islet-like clusters with frequencies of 85.90±18.28 and 54.30±8.77/1,000/1,000 cells, respectively. Somatostatin-containing cells were also dispersed in the pancreas as single cells or clusters but in the case of clusters, they are exclusively situated in the marginal regions of insulin- or glucagon-positive cell clusters. Cells stained for somatostatin cell frequency was 15.50±3.10/1000 cells. PP-containing cells were also distributed as single cells or clusters with frequency of 53.40±11.96/1,000 cells. Clusters consisted of PP-positive cells are distributed as a core type and a marginally distributed type. Overall, there were 40.84±3.81% insulin-, 26.02±1.71% glucagon-, 7.63±2.09% somatostatin- and 25.51±3.26% PP-IR cells.
The gastrointestinal tract and HIV pathogenesis
J.H Downs
South African Journal of Clinical Nutrition , 2010,
Abstract: Gastrointestinal dysfunction has been recognised as a major manifestation of the human immunodeficiency virus (HIV) infection usually presenting as diarrhoea which may or may not be due to the presence of an opportunistic infection of the GIT. Contrary to earlier assumptions, there is now substantial evidence to demonstrate that there are significant changes in the gut in the acute phase of HIV infection; the most significant of these being the substantial loss of the CD4+ T-cells in the GIT. Delays in the initiation of HAART (that is, once the CD4+ T-cell count drops below 200 cells/uL), is associated with a greater severity of HIV-associated GIT enteropathy, and poor clinical outcome.
Challenges facing the ATKV to succeed within the context of a global information community
J.H. Basson
South African Journal of Information Management , 2009, DOI: 10.4102/sajim.v4i3.180
Abstract:
Feeding habits of the Cape Mountain Zebra Equus zebra zebra LINN. 1758
J.H Grobler
Koedoe : African Protected Area Conservation and Science , 1983, DOI: 10.4102/koedoe.v26i1.596
Abstract: The feeding habits of the Cape mountain zebra Equus zebra zebra Linn. 1758, were studied in the Mountain Zebra National Park. They were highly selective utilising only seven of 17 available grass species at feeding sites and 26 of plants available. These zebra fed at 40 mm to 80 mm above the ground except when eating seed heads of certain grass species. Protein levels of grasses eaten were above 4 and seasonal movements were associated with mean food quality @ there were thus summer grazing and winter grazing areas. Mean crude protein in the faeces fluctuated seasonally.
An annotated check list of the leeches (Annelida : Hirudinea) of the Kruger National Park with a key to the species
J.H. Oosthuizen
Koedoe : African Protected Area Conservation and Science , 1991, DOI: 10.4102/koedoe.v34i2.421
Abstract: The diagnosis, distribution and bionomics of the ten species of leeches occurring in the Kruger National Park and a key to the identification of the species are presented. Seven species belong to the family Glossiphoniidae, two to the family Hirudinidae and one species to the family Salifidae. The African fish leech Batracobdelloides tricarinatus and the reptilian parasite Placobdelloidesmultistriatus are the most common species in the park. Two of the three snail leeches occurring in the reserve, viz. Alboglossiphoniadisjuncta and Helobdella conifera, the predaceous Salifa perspicax and the sanguivorous Hirudo michaelseni are widespread but not common. The snail leech Alboglossiphonia conjugata occurs only in the small Madzaringwi River and its tributaries located in the most northern part of the park. The amphibian parasite Oosthuizobdella stuhlmanni was found only at two adjacent localities in the most southern reaches of the park with the sanguivorous Asiatic obdella buntonensis limited to the southern half of the reserve. The host-specific parasite of hippopotami, Placobdelloidesjaegerskioeldi, is restricted to habitats inhabited by its host.
Surinaamse aquarellen en tekeningen van A. Borret. (Met 4 platen)
J.H. Maronier
Bijdragen tot de Taal-, Land- en Volkenkunde , 1955,
Abstract:
Tekeningen en aquarellen van J.H.W. Le Clercq (met platen)
J.H. Maronier
Bijdragen tot de Taal-, Land- en Volkenkunde , 1953,
Abstract:
Grieks aan die P.U. vir C.H.O.*
J.H. Grobler
Koers : Bulletin for Christian Scholarship , 1967, DOI: 10.4102/koers.v35i1.1373
Abstract: Met hierdie rede word betoog dat die patroon van die studie van Grieks wat deur die Atheners vier tot vyf eeue v.C. daargestel is en deur die Alexandryne en Pergamon van drie eeue v.C. tot drie eeu n.C. verder gevorm is, deur die eeue nagevolg is, telkens met die oogmerke wat gepas het by die bepaalde tye, tot in die twintigste eeu. Volgens hierdie patroon is Attiese Grieks bestudeer. Die Attiese Grieks is die literêre taal, die skryftaal, van Athene in die vyfde en vierde eeue v.C. Hierdie tradisie is ook aan die P.U. vir C.H.O. nagevolg. Aan hierdie Universiteit is die studente van Grieks hoofsaaklik, indien nie uitsluitlik nie, voornemende teologiese studente.
Die onlangse bewindverandering in Afrika
J.H. Coetzee
Koers : Bulletin for Christian Scholarship , 1966, DOI: 10.4102/koers.v34i1-3.1409
Abstract: Na die Tweede Wêreldoorlog het Afrika die aandag op horn getrek veral ten gevolge van die snelle ontvoogdingsproses ten opsigte van sy vroeere onderhorige gebiede en wel op ’n skaal en teen 'n tempo wat die benaming politieke rewolusie geregverdig het. Daar was baie wat hiervan nie veel goeds verwag het nie, maar hulle waarskuwings is versmoor onder die geklank van optimistiese jubelsange van hoe verwagtings oor die vrye state en nasies van onafhanklike Afrika. Die humanitere en liberale demokrasie is geloof as die verlossende mag en die ligbringende krag in die vroeere donker kontinent.
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