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At least 37 records · Page 2Linked to original sources
PubMed1992

Rejuvenation of Sequoia sempervirens by Repeated Grafting of Shoot Tips onto Juvenile Rootstocks in Vitro: Model for Phase Reversal of Trees.

Repeated grafting of 1.5-centimeter long shoot tips from an adult Sequoia sempervirens tree onto fresh, rooted juvenile stem cuttings in vitro resulted in progressive restoration of juvenile traits. After four successive grafts, stem cuttings of previously adult shoots rooted as well, branched as profusely, and grew with as much or more vigor as those of seedling shoots. Reassays disclosed retention for 3 years of rooting competence at similar levels as originally restored. Adventitious shoot formation was remanifested and callus development was depressed in stem segments from the repeatedly grafted adult. The reversion was associated with appearance and disappearance of distinctive leaf proteins. Neither gibberellic acid nor N(6)-beneyladenine as nutrient supplements duplicated the graft effects.

Journal Article↗
PubMed1985

An evaluation of the Sequoia-Turner Cell Dyn 900.

A formal evaluation of the Sequoia-Turner Cell Dyn 900, a compact eight-parameter semi-automated blood cell counter, was carried out in a small paediatric haematology laboratory. The instrument's precision, linearity and carry-over were adequate. Comparison with a Coulter ZF6 system plus visual platelet count showed good agreement, and results in the UK National External Quality Assessment Scheme also compared well with 'all methods' values. Throughput was assessed at 54 eight-parameter counts per hour. The machine proved to be reasonably economical, highly reliable and easy to operate. It was popular with staff and can be recommended, particularly for the smaller laboratory.

Autoanalysis↗
PubMed1976

Occupational asthma due to California red wood (Sequoia sempervirens) dusts.

Two patients with occupational asthma due to California redwood (Sequoia sempervirens) sawdust are described. They developed specific immediate and late asthmatic reactions after occupational-type exposure tests to this wood dust. In one patient the immediate asthmatic reaction was inhibited by pretreatment with disodium cromoglycate and atropine; however, the late asthmatic reaction was only partially inhibited by disodium cromoglycate and was not affected by atropine. Low molecular weight chemical compounds present in the redwood may be responsible for the symptoms.

Asthma↗
PubMed1978

Asthma due to dust from redwood (Sequoia sempervirens).

An atopic patient with adult onset of asthma due to sawdust from redwood (Sequoia sempervirens) is described. Specific late asthmatic reaction developed after challenge with inhalation of his own redwood sawdust. No subjective or objective immediate reactions were detected. Avoidance of exposure resulted in improvement. There were no pulmonary or systemic responses to challenge with inhalation of sawdust from pine wood.

Aged↗
PubMed2004

An analysis of wilderness water in Kings Canyon, Sequoia, and Yosemite national parks for coliform and pathologic bacteria.

OBJECTIVE: To determine the prevalence of coliform and potentially pathogenic bacteria in remote backcountry alpine lakes and streams of national parks in the Sierra Nevada mountains. METHODS: Water was sampled at 55 predetermined lakes and streams that would stratify the risk, based on sites used by backpackers, sites used by pack animals, and uncontaminated wild areas. Sites were distributed among Kings Canyon (15), Sequoia (17), and Yosemite (23). Water was collected using Millipore bacterial samplers, which provided specific counts of coliform and other bacteria in each water sample and also served as a transport media from the wilderness to the laboratory. On return to the laboratory, bacteria were harvested from the samplers and subjected to specific identification and qualitative analysis using standard microbiology techniques for the analysis of water. RESULTS: Coliform bacteria were detected in 22 of the 55 sites. All of these sites were below areas used by backpackers or pack animals. Thirty-three sites were free of coliforms. These sites included both those used lightly by backpackers and those with no human or domestic animal use. All samples contained expected amounts of normal aquatic bacteria including Pseudomonas, Rahnella aquatilis, Serratia spp, and nonpathogenic species of Yersinia. CONCLUSIONS: Most sampling sites in these national parks are free of coliform or pathogenic organisms. Low levels of coliform bacteria are found in some bodies of water where the watershed has been affected by human or pack animal travel.

Animals↗
PubMed1991

The Sequoia circular fixator for limb lengthening.

With the Sequoia fixator, lengthenings can be achieved based on the clinical facts of the case. The device is a modular apparatus that can perform corrections in several planes, and, if necessary, in a septic environment. In our opinion, a "lengthener surgeon" is one who can foresee problems and take appropriate steps to prevent them. Likewise, the surgeon must act as the coordinator of an entire team. A successful lengthening is 5% surgery and 95% postoperative nursing and physiotherapy care. In the future, a number of changes will simplify postoperative management: 1. Composite carbon rings will make the frames radiolucent and one third lighter than those made of stainless steel. Automatic tensioners will help maintain steady tension on the wires. 2. Digital analysis of the callus will provide norms of consolidation, allowing faster fixator removal and conversion to an orthosis. 3. Incorporating the foot in the frame to overcome equinus will eliminate the need for tenotomy. We believe that monolateral and ring fixators can work together in certain locations. That is why we proposed, at the 18th Societé Internationale de Chirurgie Orthopédique et Traumatologique meeting, a combined monolateral-ring construct that can be used for lengthening throughout the proximal femoral metaphysis.

Adolescent↗