A silica-deficient, shallow-marine zeolite assemblage in the Foveaux Formation, Bluff Peninsula, New Zealand

2005 ◽  
Vol 69 (2) ◽  
pp. 137-144 ◽  
Author(s):  
D. S. Coombs ◽  
C. A. Bosel ◽  
Y. Kawachi ◽  
L. A. Paterson
Keyword(s):  
New Zealand ◽  
Low Temperature ◽  
Maximum Temperature ◽  
List Type ◽  
Late Oligocene ◽  
Shell Material ◽  
Calcic Plagioclase ◽  
Shallow Marine ◽  
Igneous Complex ◽  
Sea Cliff

AbstractA gonnardite-thomsonite-chabazite-calcite assemblage forms a cement in the Foveaux Formation, a fossiliferous gabbroic boulder bed that accumulated at the base of a sea cliff cut in a Permian igneous complex during late Oligocene±early Miocene time. Gonnardite was the earliest zeolite to form, locally following minor calcite. It was followed epitaxially by thomsonite, co-precipitating with chabazite. Crystal habits indicate a low-temperature origin. The maximum temperature to which the deposit may have been subjected is estimated as not more than ∽30°C. The chabazites are Ca-poor chabazite-K and chabazite-Na. Representative electron microprobe analyses are as follows, all + nH2O:thomsonite: Na3.77Ca7.73(Al19.39Si20.65)O80 and Na3.78K0.04Ca7.25Mg0.05(Al19.13Si21.05)O80;gonnardite: Na6.95K0.03Ca4.73(Al16.99Si23.15)O80 and Na8.56K0.03Ca4.05(Al17.32Si22.84)O80;chabazite-K: Na1.18K1.72Ca0.08Mg0.23(Al3.51Si8.49)O24 and Na1.67K1.92Ca0.18Mg0.17(Al4.11Si7.85)O24;chabazite-Na: Na2.51K1.13Ca0.17Mg0.02(Al4.08Si7.93)O24.Such a Si-poor zeolite assemblage is unusual for marine sediments and is attributed to precipitation from marine water impoverished in silica in the gabbroic boulder bed and interacting with shell material and calcic plagioclase. In contrast, a dioritic clast in the boulder bed provides an example of less silica-poor zeolites originally formed in the parent igneous complex. Veinlets in the clast contain scolecite averaging Na1.19Ca7.36(Al15.84Si24.14)O80.nH2O, and mesolite averaging Na5.13K0.03Ca5.24 (Al15.93Si24.13)O80.nH2O, in part as sub-microscopic intergrowths. The composition of scolecite closely corresponds to the most Na-rich scolecite reported hitherto.

The promises and perfidy of cryomicroscopy and analysis

1994 ◽  
Vol 52 ◽  
pp. 382-383
Author(s):  
Patrick Echlin
Keyword(s):  
Low Temperature ◽  
High Energy ◽  
Short Paper ◽  
List Type ◽  
Time Resolved ◽  
Energy Beam ◽  
Cellular Analysis ◽  
Dissolved Ions ◽  
Embedding Medium ◽  
Low Temperature Microscopy

The unusual title of this short paper and its accompanying tutorial is deliberate, because the intent is to investigate the effectiveness of low temperature microscopy and analysis as one of the more significant elements of the less interventionist procedures we can use to prepare, examine and analyse hydrated and organic materials in high energy beam instruments. The promises offered by all these procedures are well rehearsed and the litany of petitions and responses may be enunciated in the following mantra.Vitrified water can form the perfect embedding medium for bio-organic samples.Frozen samples provide an important, but not exclusive, milieu for the in situ sub-cellular analysis of the dissolved ions and electrolytes whose activities are central to living processes.The rapid conversion of liquids to solids provides a means of arresting dynamic processes and permits resolution of the time resolved interactions between water and suspended and dissolved materials.The low temperature environment necessary for cryomicroscopy and analysis, diminish, but alas do not prevent, the deleterious side effects of ionizing radiation.Sample contamination is virtually eliminated.

Criteria for the evaluation of low-temperature Scanning Electron Microscopy

1986 ◽  
Vol 44 ◽  
pp. 902-903
Author(s):  
Alan Beckett
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Low Temperature ◽  
Conformational Changes ◽  
Chemical Vapour ◽  
List Type ◽  
Dimensional Changes ◽  
Critical Point Drying ◽  
Temperature Scanning ◽  
Scanning Electron

Low temperature scanning electron microscopy (LTSEM) has been evaluated with special reference to its application to the study of morphology and development in microorganisms. A number of criteria have been considered and have proved valuable in assessing the standard of results achieved. To further aid our understanding of these results, it has been necessary to compare those obtained by LTSEM with those from more conventional preparatory procedures such as 1) chemical fixation, dehydration and critical point-drying; 2) freeze-drying with or without chemical vapour fixation before hand.The criteria used for assessing LTSEM for the above purposes are as follows: 1)Specimen immobilization and stabilization2)General preservation of external morphology3)General preservation of internal morphology4)Exposure to solvents5)Overall dimensional changes6)Cell surface texture7)Differential conformational changes8)Etching frozen-hydrated material9)Beam damage10)Specimen resolution11)Specimen life

TIMING AND STYLE OF KAIKOURA RANGE DEVELOPMENT AND MARLBOROUGH FAULTING, SOUTH ISLAND, NEW ZEALAND, FROM LOW-TEMPERATURE THERMOCHRONOLOGY

2017 ◽  
Author(s):  
Alison R. Duvall ◽  
◽  
Camille Collett ◽  
Rebecca M. Flowers ◽  
Gregory E. Tucker ◽  
...  
Keyword(s):  
New Zealand ◽  
Low Temperature

Initiatives in Religious Education for Handicapped Children, Adolescents and Adults

1984 ◽  
Vol 8 (2) ◽  
pp. 30-35
Author(s):  
B. D. Briese
Keyword(s):  
Special Education ◽  
New Zealand ◽  
Christian Education ◽  
Religious Education ◽  
Sunday School ◽  
Social Aspects ◽  
List Type ◽  
Special Schools ◽  
Handicapped Children ◽  
Adolescents And Adults

The Crossroads Special Education Task Group was formed in Queensland early in 1983 at the request of the Joint Board of Christian Education of Australia and New Zealand. Crossroads is an Australia wide, inter-church organisation which promotes the welfare of handicapped persons through: (a) regular club programs which have spirtual, recreational, educational and social aspects;(b) holiday activities under structured leadership and help from “enablers”;(c) special assistance to handicapped persons in church and Sunday school;(d) provision of religious education programsin State special schools;(e) chaplaincies to sheltered employment centres and institutions.

scholarly journals Reticulate Nummulites (N. fabianii Linage) and Age of the Pellatispira-Beds of the Drazinda Formation, Sulaiman Range, Pakistan

2019 ◽  
Vol 2 (1) ◽  
Author(s):  
Ozcan E
Keyword(s):  
Mediterranean Region ◽  
Late Eocene ◽  
Test Surface ◽  
Time Interval ◽  
Late Oligocene ◽  
Shallow Marine ◽  
Western Tethys ◽  
Two Samples ◽  
Evolutionary Scheme ◽  
Weak Surface

The Eocene shallow marine Pellatispira-beds in the upper part of the Drazinda Formation represent the latest phase of Cenozoic Tethyan marine deposition in the Sulaiman Range, West Pakistan. The unit consists of stratigraphically important taxa as Heterostegina,Silvestriella, Pellatispira, a new Baculogypsina (possibly ancestral to modern Baculogypsina) and reticulate Nummulites implying a latest middle to late Eocene (late Bartonian-Priabonian) age. A more precise age of the unit requires the biometric study of reticulate Nummulites, the evolutionary scheme of which is better known from the peri-Mediterranean region in the Tethys. This group, which was subdivided into a series of successive chrono-species based on the biometry of inner cross-diameter of proloculus and changes in the types of granulation/reticulation on the test surface in the late Eocene-late Oligocene interval, appears to have a significant biostratigraphic potential for a high-resolution biostratigraphy in the peri-Mediterranean region (Western Tethys). The reticulate Nummulites in two samples from Rakhi Nala and Zinda Pir, ZP22 and RNB10, were studied and compared with those from the peri-Mediterranean region. The isolated specimens have a weak surface granulation externally, a distinct small umbonal granule (pile) and typical reticulation. The samples ZP22 and RNB10 from Zinda Pir and and Rakhi Nala sections have an average inner cross diameter of proloculus of 152.0 and 153.0 μm respectively. The reticulate Nummulites in both samples are assigned to N. hormoensis, a chrono-species characteristic for the shallow benthic zone (SBZ 18), referable to latest Bartonian-early Priabonian time interval. Since Heterostegina in peri-Mediterranean region and in Pakistan belongs to different lineages, a correlation of N. hormoensis in the studied samples with the wellestablished evolutionary scheme of Heterostegina reticulata and H.armenica lineages from the Western Tethys was not possible.

Late Oligocene‐Early Miocene leaf macrofossils confirm a long history ofAgathisin New Zealand

2007 ◽  
Vol 45 (4) ◽  
pp. 565-578 ◽  
Author(s):  
Daphne E. Lee ◽  
Jennifer M. Bannister ◽  
Jon K. Lindqvist
Keyword(s):  
New Zealand ◽  
Early Miocene ◽  
Late Oligocene

scholarly journals Randomised controlled pilot trial comparing low dose and very low- dose microdrop administration of phenylephrine and cyclopentolate for retinopathy of prematurity eye examinations in neonates

2020 ◽  
pp. archdischild-2019-318733
Author(s):  
Lisa Jean Kremer ◽  
Roland Broadbent ◽  
Natalie Medlicott ◽  
Mary Jane Sime ◽  
Frances McCaffrey ◽  
...  
Keyword(s):  
New Zealand ◽  
Adverse Effects ◽  
Retinopathy Of Prematurity ◽  
Neonatal Intensive Care ◽  
Low Dose ◽  
Pilot Trial ◽  
Safety Data ◽  
List Type ◽  
Registration Number ◽  
Randomised Controlled

AimsTo determine ifVery low dose mydriatic eye microdrop regimen sufficiently dilates the pupil (above 4.1 mm) compared with the currently used low dose mydriatic eye microdrop regimen.Cardiovascular, gastrointestinal and respiratory adverse effects occur following eye drop instillation.MethodsSeventeen premature infants were recruited into this prospective, randomised controlled pilot trial in January 2017 to November 2018. Data were collected from the single-centre Neonatal Intensive Care Unit, Dunedin Hospital, New Zealand. The inclusion criteria were birth weight less than 1500 g or gestational age less than 31 weeks, or any premature infant requiring red reflex testing. Infants were randomised to receive either phenylephrine 1% or 0.5% and cyclopentolate 0.2% or 0.1%, 1 microdrop in both eyes. Efficacy outcome measures were pupil size at retinopathy of prematurity eye examination (ROPEE) and ophthalmologist rating of ease of screen.ResultsAll participants had sufficient pupillary dilation for a successful ROPEE. Ophthalmologists rated the ROPEE as easy for 90% of all examinations. Pupil dilation measurements at the time of examination, mean±SD, 4.8±0.2 (95% CI 4.5 to 5.2) mm for treatment A and 5±0.2 (95%CI 4.6 to 5.4) mm for treatment B (p=0.61). There were no statistically significant differences between the groups for safety data.ConclusionsVery low dose microdrop administration of phenylephrine and cyclopentolate appears to be effective at sufficiently dilating the neonatal pupil for ROPEEs. Low dose and very low dose microdrop mydriatic regimens may also reduce the risk of unwanted adverse effects associated with these medicines.Trial registration numberAustralian New Zealand Clinical Trials Registry (reference ACTRN12616001266459p).

Sign in / Sign up

Export Citation Format

Share Document