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Articles 1 - 16 of 16
Full-Text Articles in Life Sciences
Synaptic Heterogeneity And Stimulus-Induced Modulation Of Depression In Central Synapses, John D. Hunter, John Milton
Synaptic Heterogeneity And Stimulus-Induced Modulation Of Depression In Central Synapses, John D. Hunter, John Milton
WM Keck Science Faculty Papers
Short-term plasticity is a pervasive feature of synapses. Synapses exhibit many forms of plasticity operating over a range of time scales. We develop an optimization method that allows rapid characterization of synapses with multiple time scales of facilitation and depression. Investigation of paired neurons that are postsynaptic to the same identified interneuron in the buccal ganglion of Aplysia reveals that the responses of the two neurons differ in the magnitude of synaptic depression. Also, for single neurons, prolonged stimulation of the presynaptic neuron causes stimulus-induced increases in the early phase of synaptic depression. These observations can be described by a …
Puerto Rican Karst - A Vital Resource, Ariel E. Lugo, Leopoldo Miranda Castro, Abel Vale, Tania Del Mar López, Enrique Hernández Prieto, Andrés García Martinó, Alberto R. Puente Rolón, Adrianne G. Tossas, Donald A. Mcfarlane, Tom Miller, Armando Rodríguez, Joyce Lundberg, John Thomlinson, José Colón, Johannes H. Schellekens, Olga Ramos, Eileen Helmer
Puerto Rican Karst - A Vital Resource, Ariel E. Lugo, Leopoldo Miranda Castro, Abel Vale, Tania Del Mar López, Enrique Hernández Prieto, Andrés García Martinó, Alberto R. Puente Rolón, Adrianne G. Tossas, Donald A. Mcfarlane, Tom Miller, Armando Rodríguez, Joyce Lundberg, John Thomlinson, José Colón, Johannes H. Schellekens, Olga Ramos, Eileen Helmer
WM Keck Science Faculty Papers
The limestone region of Puerto Rico covers about 27.5 percent of the island's surface and is subdivided into the northern, southern, and dispersed limestone areas. All limestone areas have karst features. The karst belt is that part of the northern limestone with the most spectacular surficial karst landforms. It covers 142,544 ha or 65 percent of the northern limestone. The karst belt is the focus of this publication, although reference is made to all limestone regions. The northern limestone contains Puerto Rico's most extensive freshwater aquifer, largest continuous expanse of mature forest, and largest coastal wetland, estuary, and underground cave …
Phase Modulation At 125 Khz In A Michelson Interferometer Using An Inexpensive Piezoelectric Stack Driven At Resonance, Barbara M. Hoeling, Andrew D. Fernandez, Richard C. Haskell, Daniel C. Petersen
Phase Modulation At 125 Khz In A Michelson Interferometer Using An Inexpensive Piezoelectric Stack Driven At Resonance, Barbara M. Hoeling, Andrew D. Fernandez, Richard C. Haskell, Daniel C. Petersen
All HMC Faculty Publications and Research
Fast phase modulation has been achieved in a Michelson interferometer by attaching a lightweight reference mirror to a piezoelectric stack and driving the stack at a resonance frequency of about 125 kHz. The electrical behavior of the piezo stack and the mechanical properties of the piezo-mirror arrangement are described. A displacement amplitude at resonance of about 350 nm was achieved using a standard function generator. Phase drift in the interferometer and piezo wobble were readily circumvented. This approach to phase modulation is less expensive by a factor of roughly 50 than one based on an electro-optic effect.
Contents 20(1)
Aliso: A Journal of Systematic and Floristic Botany
No abstract provided.
Fraxinus Parryi, Nom. Nov., Of Nw Baja California, Mexico, Reid Moran
Fraxinus Parryi, Nom. Nov., Of Nw Baja California, Mexico, Reid Moran
Aliso: A Journal of Systematic and Floristic Botany
The common ash of NW Baja California is usually called Fraxinus trifoliata, as in Wiggins' (1980) flora of Baja California. That name is a misspelling of F. trifoliolat, which is a later homonym of F. rriJoliolara W. W. Smith (1916). The Baja Californian ash is therefore renamed Fraxinus parryi. It has also been misidentified as F. jonesii. The common name is "crucecilla". This ash barely extends into San Diego County, California.
Recognition Of Bromus Richardsonii And B. Ciliatus: Evidence From Morphology, Cytology, And Dna Fingerprinting (Poaceae: Bromeae), Paul M. Peterson, Jacques Cayouette, Yasas S. N. Ferdinandez, Bruce Coulman, Ralph E. Chapman
Recognition Of Bromus Richardsonii And B. Ciliatus: Evidence From Morphology, Cytology, And Dna Fingerprinting (Poaceae: Bromeae), Paul M. Peterson, Jacques Cayouette, Yasas S. N. Ferdinandez, Bruce Coulman, Ralph E. Chapman
Aliso: A Journal of Systematic and Floristic Botany
Since our goal was to determine characteristic differences between Bromus richardsonii and B. ciliates, a discriminate analysis (DA), principal components analysis (PCA), multidimensional scaling (MDS), bivariate analysis, and an amplified fragment length polymorphisms (AFLP) analysis were undertaken on 93 herbarium specimens and 31 field-collected populations. A cytological survey of B. ciliates, B. richardsonii, and B. mucroglumis confirm previous reports that the first species is diploid (2n = 14) and the latter two are tetraploid (2n = 28). All taxa were correctly classified in the DA and important characters for each of the species were identified. Bromus …
Schaffnerella Rediscovered! (Gramineae, Chloridoideae), J. Travis Columbus, Hester L. Bell, Rosa Cerros-Tlatilpa, M. Patrick Griffith, J. Mark Porter
Schaffnerella Rediscovered! (Gramineae, Chloridoideae), J. Travis Columbus, Hester L. Bell, Rosa Cerros-Tlatilpa, M. Patrick Griffith, J. Mark Porter
Aliso: A Journal of Systematic and Floristic Botany
From 1876 to 1880 in San Luis Potosí, Mexico, J. G. Schaffner made the first collections of a small grass that later was named Schaffnerella gracilis (Chloridoideae). The monotypic genus apparently was not encountered again by botanists until 2001, when, during a targeted search, we discovered it in the Sierra de San Miguelito growing along the Río Potosino, ca. 6 air km southwest of the city of San Luis Potosí. Most of the 100-150 plants encountered along a 3-km stretch of the Río Potosino above the village of Escalerillas and reservoir EI Potosino were growing in a moist alluvium of …
New Records For The Vascular Flora Of The Santa Ana Mountains, California, Steve Boyd
New Records For The Vascular Flora Of The Santa Ana Mountains, California, Steve Boyd
Aliso: A Journal of Systematic and Floristic Botany
Documentation is provided for 23 taxa not included in other published floristic accounts of the Santa Ana Mountains. A representative voucher specimen and generalized distribution information are cited for each taxon.
Contents 20(2)
Aliso: A Journal of Systematic and Floristic Botany
No abstract provided.
Structure Of The Pericarp In Some Amaranthus L. (Amaranthaceae) Species And Its Taxonomic Significance, Mihai Costea, Giles Waines, Andrew Sanders
Structure Of The Pericarp In Some Amaranthus L. (Amaranthaceae) Species And Its Taxonomic Significance, Mihai Costea, Giles Waines, Andrew Sanders
Aliso: A Journal of Systematic and Floristic Botany
In order to determine their taxonomic significance, 10 pericarp structure characters were scored for 21 Amaranthus L. taxa. In many, pericarp patterns permit recognition of the taxa as species. Differences between cultivated taxa and their wild relatives offer new arguments against their taxonomic union. The relationships between other closely related taxa are also analyzed (A. quitensis and A. hybridus: A. bouchonii and A. powellii; A. hybridus and A. powellii; A. blitum and A. emarginatus). Mechanisms of dehiscence and terminology for the fruit of Amaranthus are considered.
Seed Dispersal In Yucca Brevifolia (Agavaceae)-Present And Past, With Consideration Of The Future Of The Species, Lee W. Lenz
Seed Dispersal In Yucca Brevifolia (Agavaceae)-Present And Past, With Consideration Of The Future Of The Species, Lee W. Lenz
Aliso: A Journal of Systematic and Floristic Botany
Earlier descriptions of the fruit of Yucca brevifolia are reviewed. It is here shown that the fruit is a fleshy, sugar-rich berry that later becomes a hard, dry, spongy body. At no time are seeds released from the fruits without the exertion of an outside force. Various animals that might release seeds from the dry fruits are considered, as is wind that may disperse entire fruits. The question is introduced as to why Y. brevifolia Engelm. would expend large amounts of energy and resources to create a product for which there is no market. The appeal that the fruits may …
A New Species Of Extinct Oryzomyine Rodent From The Quaternary Of Curaçao, Netherlands Antilles, Donald A. Mcfarlane, Adolphe O. Debrot
A New Species Of Extinct Oryzomyine Rodent From The Quaternary Of Curaçao, Netherlands Antilles, Donald A. Mcfarlane, Adolphe O. Debrot
WM Keck Science Faculty Papers
An extinct new species of Oryzomyine rodent, known since 1936 from the cave of Grot van Hato on the island of Curaçao, is described from abundant new specimens collected from owl-pellet deposits at three localities on the island.
Experimental Hybridization Of Northern Chihuahuan Desert Region Opuntia (Cactaceae), M. Patrick Griffith
Experimental Hybridization Of Northern Chihuahuan Desert Region Opuntia (Cactaceae), M. Patrick Griffith
Aliso: A Journal of Systematic and Floristic Botany
Possible natural hybridization among 11 taxa of Opuntia sensu stricto was investigated in the northern Chihuahuan Desert region through the use of experimental hybridization. Established plants representing specific taxa growing in the Sul Ross State University Opuntia garden were used for all experiments. Reciprocal crosses were made between putative parental taxa of field-observed putative hybrids, and each experimental cross analyzed for fruit and seed set. For each taxon, tests were performed to control for possible apomictic, autogamous, and geitonogamous seed set. Several experimental crosses were found to set seed in amounts expected for natural pollination events. Data gathered from the …
Systematics And Relationships Of Fallugia (Rosoideae—Rosaceae), James Henrickson
Systematics And Relationships Of Fallugia (Rosoideae—Rosaceae), James Henrickson
Aliso: A Journal of Systematic and Floristic Botany
The paper presents a systematic monograph of Fallugia (Rosoideae, Rosaceae) consisting of one variable species, Fallugia paradoxa. Morphological, cytological and molecular data clearly support its relationship with Geums.l. rather than Purshia-Cowani, with which it is often allied. The species was named twice independently in 1825 from the specimens and drawings, respectively, assembled by Sessé and Mociño for their proposed Flora Mexicana. The paper discusses the nomenclatural history, morphological variation, and the polygarno-dioecious mode of reproduction of the species. No infraspecific taxa are recognized.
Vascular Flora Of The Glass Mountain Region, Mono County, California, Michael A. Honer
Vascular Flora Of The Glass Mountain Region, Mono County, California, Michael A. Honer
Aliso: A Journal of Systematic and Floristic Botany
The purpose of this study is to document the vascular flora of the Glass Mountain region of Mono County, California. Little focused botanical attention has been given to this remote volcanic mountain range between the Sierra Nevada and White Mountains of eastern California. The majority of collecting in the area was done from the 1960s through 1998 by Dean W. Taylor, Mary DeDecker, and Jack Reveal, providing good documentation of a few scattered localities of the range. This study circumscribes a large area around the Glass Mountain range, and attempts to catalog the diversity of vascular plants with vouchered collections …