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Articles 1 - 19 of 19
Full-Text Articles in Life Sciences
The Age Of The Woolly Rhino From Dream Cave, Derbyshire, Uk, Donald A. Mcfarlane, Joyce Lundberg, Derek C. Ford
The Age Of The Woolly Rhino From Dream Cave, Derbyshire, Uk, Donald A. Mcfarlane, Joyce Lundberg, Derek C. Ford
WM Keck Science Faculty Papers
The Dream Cave woolly rhinoceros, Coelodonta antiquitatis, is a "classic" specimen of a "cold-stage" fossil fauna from central England. The find was illustrated and described by Dean William Buckland in his seminal tome Reliquiae Diluvianae (1823) during the first half of the 19th century, and made a significant contribution to the development of Buckland's views on the origin of extinct and extirpated fossil vertebrates. The report presents the first, albeit indirect, radiometric dates on the specimen, and argues that the animal fell into the cave just before 37,000 years BP, during the middle of Marine Isotope Stage 3 Interstadial (41 …
Biochemical And Genetic Conservation Of Fission Yeast Dsk1 And Human Srpk1, Zhaohua Irene Tang, Tiffany Kuo, Jenny Shen, Ren-Jang Lin
Biochemical And Genetic Conservation Of Fission Yeast Dsk1 And Human Srpk1, Zhaohua Irene Tang, Tiffany Kuo, Jenny Shen, Ren-Jang Lin
WM Keck Science Faculty Papers
Arginine/serine-rich (RS) domain-containing proteins and their phosphorylation by specific protein kinases constitute control circuits to regulate pre-mRNA splicing and coordinate splicing with transcription in mammalian cells. We present here the finding that similar SR networks exist in Schizosaccharomyces pombe. We previously showed that Dsk1 protein, originally described as a mitotic regulator, displays high activity in phosphorylating S. pombe Prp2 protein (spU2AF59), a homologue of human U2AF65. We now demonstrate that Dsk1 also phosphorylates two recently identified fission yeast proteins with RS repeats, Srp1 and Srp2, in vitro. The phosphorylated proteins bear the same phosphoepitope found in mammalian SR proteins. Consistent …
Contents 19(1)
Aliso: A Journal of Systematic and Floristic Botany
No abstract provided.
Map-Making Of Plant Biomass And Leaf Area Index For Management Of Protected Areas, Loretta Gratani, Maria Fiore Crescente
Map-Making Of Plant Biomass And Leaf Area Index For Management Of Protected Areas, Loretta Gratani, Maria Fiore Crescente
Aliso: A Journal of Systematic and Floristic Botany
An inventory of the vegetation types of Castelporziano Estate (Rome), including examples of Mediterranean ecosystems in excellent preserved condition, was compiled. Because Leaf Area Index (LAI) changed with forest structure and developmental stages, maximum LAI provided a good estimate of maximum biomass accumulation. Plant biomass estimation, ranging from 61 tons ha-1 to 360 tons ha-1, fitted well into 14 biomass classes; the highest values (from 301 tons ha-1 to 360 tons ha-1) were related to stratified forested vegetation types, including the more mature Pinus pinea plantations, Quercus ilex evergreen forests and broad leaf mixed …
Wood And Stem Anatomy Of Phytolaccoid And Rivinoid Phytolaccaceae (Caryophyllales): Ecology, Systematics, Nature Of Successive Cambia, Sherwin Carlquist
Wood And Stem Anatomy Of Phytolaccoid And Rivinoid Phytolaccaceae (Caryophyllales): Ecology, Systematics, Nature Of Successive Cambia, Sherwin Carlquist
Aliso: A Journal of Systematic and Floristic Botany
Quantitative and qualitative wood features are presented and analyzed for seven species of subfamily Rivinoideae and four of subfamily Phytolaccoideae. All species have nonbordered perforations plates, as elsewhere in suborder Phylocaccineae. Libriform fibers characterize both subfamilies, but vasicentric tracheids occur in two rivinoid species. Axial parenchyma is vasicentric scanty (apotracheal bands and patches in one species). Rays are mostly multiseriate, with procumbent cells infrequent in most species. Rivinoids and phytolaccoids differ from each other in ray height and width and in crystal types. The xeromorphic wood of Petiveria and Rivina is related to their short duration (woody herbs) in disturbed …
Sem Studies On Vessels In Ferns. 18. Montane Cheilanthoid Ferns (Pteridaceae) Of North America, Sherwin Carlquist, Edward L. Schneider
Sem Studies On Vessels In Ferns. 18. Montane Cheilanthoid Ferns (Pteridaceae) Of North America, Sherwin Carlquist, Edward L. Schneider
Aliso: A Journal of Systematic and Floristic Botany
Xylem of roots and rhizomes of five species of four genera of tribe Cheilantheae (Pteridaceae; recently recognized by some as a segregate family, Cheilanthaceae) has been studied by means of scanning electron microscopy (SEM). All of these species occur in habitats (cliffs, talus) of mountains of North America that are seasonally dry in summer and cold in winter. The vessels prove diverse, indicating that different perforation plate modifications are represented in the cheilanthoid ferns of these habitats, rather than different degrees of the same kind of modification. The modifications include wide perforations alternating with narrow perforations (especially prominent in Bommeria); …
Phylogenetic Relationships In Phoradendreae (Viscaceae) Inferred From Three Regions Of The Nuclear Ribosomal Cistron. Ii. The North American Species Of Phoradendron, Vanessa E. T. M. Ashworth
Phylogenetic Relationships In Phoradendreae (Viscaceae) Inferred From Three Regions Of The Nuclear Ribosomal Cistron. Ii. The North American Species Of Phoradendron, Vanessa E. T. M. Ashworth
Aliso: A Journal of Systematic and Floristic Botany
A parsimony analysis based on sequences from the ITS region and two partitions of the 26S subunit of nuclear ribosomal DNA was used to infer phylogenetic relationships among the North American species of Phoradendron. A strongly supported clade united all but one of the species typically lacking cataphylls, a character used previously to distinguish the northern species from those of Central and South America. The divergent placement of P. californicum relative to the members of this "northern" clade confirmed the hypothesis that species lacking cataphylls are polyphyletic. Four of five species parasitic on conifers formed a well-supported clade. However, a …
Typification And Change In Status Of Yucca Schottii (Agavaceae), Lee W. Lenz, Michael A. Hanson
Typification And Change In Status Of Yucca Schottii (Agavaceae), Lee W. Lenz, Michael A. Hanson
Aliso: A Journal of Systematic and Floristic Botany
George Engelmann's concept of Y. schottii as a plant with short, stiff, yellow-green leaves has not been accepted by recent authors who apply the name to plants of southern Arizona with broad, flexible blue-green leaves. Interspecific hybrids among three yuccas present in the area, Y. baccata, Y. elata, and the wide, blue-green leafed plant are common. We believe that Arthur Schott’s collections made in 1853 upon which Engelmann based his description are of hybrid origin. We accept Engelmann's designation as the earliest applicable binomial but accord it a change in status as Y. Xschottii Engelmann pro. …
A Phylogenetic Classification Of Polemoniaceae, J. Mark Porter, Leigh A. Johnson
A Phylogenetic Classification Of Polemoniaceae, J. Mark Porter, Leigh A. Johnson
Aliso: A Journal of Systematic and Floristic Botany
Three hundred seventy nine species of Polemoniaceae are arranged in a phylogenetic classification composed of three subfamilies, eight tribes, and 26 genera. Nomenclature of one tribe is clarified and the circumscription of several tribes differs greatly from previous classifications. Five new genera, Bryantiella, Dayia, Lathrocasis, Microgilia, and Saltugilia, are proposed. In addition, four new species are described from the genera Allophyllum, Dayia, Giliastrum, and lpomopsis. This treatment represents a major reclassification with 59 new combinations, and the application of several additional combinations not used in recent years.
Contents 19(2)
Aliso: A Journal of Systematic and Floristic Botany
No abstract provided.
Wood Anatomy Of Fouquieriaceae In Relation To Habit, Ecology, And Systematics; Nature Of Meristems In Wood And Bark, Sherwin Carlquist
Wood Anatomy Of Fouquieriaceae In Relation To Habit, Ecology, And Systematics; Nature Of Meristems In Wood And Bark, Sherwin Carlquist
Aliso: A Journal of Systematic and Floristic Botany
Qualitative and quantitative data are presented for wood of all species of Fouquieriaceae, the samples selected so as to cover important variables with respect to organography and age. Wood contains fibertracheids (plus a few vasicentric tracheids). Diffuse axial parenchyma is mostly grouped as diffuse-in-aggregates or diffuse clusters (new term), with transitions to pervasive axial parenchyma in some species. Rays are Heterogeneous Type II. These wood features are relatively unspecialized and are consistent with placement of the family in Ericales s.1. as defined in recent DNA-based cladograms. Xeromorphic wood in nonsucculent species occurs only in Fouquieria shrevei; the lateral branches …
Yuccas (Agavaceae) Of The International Four Corners: Southwestern Usa And Northwestern Mexico, Lee W. Lenz, Michael A. Hanson
Yuccas (Agavaceae) Of The International Four Corners: Southwestern Usa And Northwestern Mexico, Lee W. Lenz, Michael A. Hanson
Aliso: A Journal of Systematic and Floristic Botany
Yuccas (Yucca, Agavaceae) are an easily recognizable constituent of the vegetation of the International Four Corners; an area made up of portions of Arizona, New Mexico, Sonora and Chihuahua. We recognize three species as native to the region, Yucca baccata, Y. elata and Y. madrensis, together with interspecific hybrids, and document for the first time naturally occurring intersectional hybridization between baccate-fruited (sect. Yucca) and capsular-fruited (sect. Chaenocarpa) species. We examine the reproductive barriers to hybridization operating within the genus, i.e., spatial, temporal and ethological, and we consider circumstances that may have been responsible for the production and …
New Euphorbiaceae From Mexico, Victor W. Steinmann
New Euphorbiaceae From Mexico, Victor W. Steinmann
Aliso: A Journal of Systematic and Floristic Botany
This article contained descriptions of five new taxa of Mexican Euphorbiaceae. Euphorbia (subg. Agaloma) nayarensis is endemic to pine-oak woodland in the mountains of central Nayarit. It appears related to E. soobyi but differs by possessing linear to linear-ovate leaves. Croton varelae is also endemic to central Nayarit. A key was provided to distinguish this species, a member of sect. Geiseleria, from the seven other Mexican species of this section. Croton ramillatus var. magniglandulifer occurs in the states of Guerrero and Morelos. This new variety differs from var. ramillatus by the possession of larger petiolar glands. Croton michaelii …
Index To Volumes 18 And 19
Aliso: A Journal of Systematic and Floristic Botany
No abstract provided.
New Specimens Of Late Quaternary Extinct Mammals From Caves In Sanchez Ramirez Province, Dominican Republic, Donald A. Mcfarlane, Abel Vale, Keith Christenson, Joyce Lundberg, Gabriel Atilles, Stein Erik Lauritzen
New Specimens Of Late Quaternary Extinct Mammals From Caves In Sanchez Ramirez Province, Dominican Republic, Donald A. Mcfarlane, Abel Vale, Keith Christenson, Joyce Lundberg, Gabriel Atilles, Stein Erik Lauritzen
WM Keck Science Faculty Papers
During the late Quaternary, the island of Hispaniola supported one of the most diverse mammalian faunas in the West Indies. Much of this diversity was lost to extinction in the past 100,000 years, but the timing of these events is poorly known. Here we report the paleontological findings of a multidisciplinary investigation of caves in the central Dominican Republic. These findings include new 'last occurrence' dates for the rodents Isolobodon portoricensis and Brotomys cf. voratus that take these genera to the dawn of the historic era; a first record of a last-interglacial sloth, and the first report of the upper …
Reviewers Of Manuscripts, Volumes 18 And 19
Reviewers Of Manuscripts, Volumes 18 And 19
Aliso: A Journal of Systematic and Floristic Botany
No abstract provided.
Autophagomyces, Bordea, And A New Genus, Rossiomyces, (Laboulbeniales), Richard K. Benjamin
Autophagomyces, Bordea, And A New Genus, Rossiomyces, (Laboulbeniales), Richard K. Benjamin
Aliso: A Journal of Systematic and Floristic Botany
A revision of Autophagomyces (Laboulbeniales) was made based on a comparative morphological study of new collections and 16 species included in the genus by Thaxter in the final volume of his monograph published in 1931 and by others more recently. The concept of Autophagomyces (species on Anthicidae, Phalacridae, and Scapidiidae [Coleoptera]) was narrowed and comprises 12 species, four of them new, i.e., A. hammondii, A. mexicanus, A. protuberans, and A. ramosus. The genus Bordea (species on Pselaphinae, Staphylinidae [Coleopteraj), which had been included in Autophagomyces by Thaxter, was reinstated and comprises 14 species, seven new, i.e., …
Age Differences In Behavior And Pet Activation Reveal Differences In Interference Resolution In Verbal Working Memory, Alan Hartley, John Jonides, Christina Marshuetz, Edward E. Smith, Patricia A. Reuter-Lorenz, Robert A. Koeppe
Age Differences In Behavior And Pet Activation Reveal Differences In Interference Resolution In Verbal Working Memory, Alan Hartley, John Jonides, Christina Marshuetz, Edward E. Smith, Patricia A. Reuter-Lorenz, Robert A. Koeppe
Scripps Faculty Publications and Research
Older adults were tested on a verbal working memory task that used the item-recognition paradigm. On some trials of this task, response-conflict was created by presenting test-items that were familiar but were not members of a current set of items stored in memory. These items required a negative response, but their familiarity biased subjects toward a positive response. Younger subjects show an interference effect on such trials, and this interference is accompanied by activation of a region of left lateral prefrontal cortex. However, there has been no evidence that the activation in this region is causally related to the interference …
Age Differences In The Frontal Lateralization Of Verbal And Spatial Working Memory Revealed By Pet, Alan Hartley, Patricia A. Reuter-Lorenz, John Jonides, Edward E. Smith, Andrea Miller, Christina Marshuetz, Robert A. Koeppe
Age Differences In The Frontal Lateralization Of Verbal And Spatial Working Memory Revealed By Pet, Alan Hartley, Patricia A. Reuter-Lorenz, John Jonides, Edward E. Smith, Andrea Miller, Christina Marshuetz, Robert A. Koeppe
Scripps Faculty Publications and Research
Age-related decline in working memory figures prominently in theories of cognitive aging. However, the effects of aging on the neural substrate of working memory are largely unknown. Positron emission tomography (PET) was used to investigate verbal and spatial short-term storage (3 sec) in older and younger adults. Previous investigations with younger subjects performing these same tasks have revealed asymmetries in the lateral organization of verbal and spatial working memory. Using volume of interest (VOI) analyses that specifically compared activation at sites identified with working memory to their homologous twin in the opposite hemisphere, we show pronounced age differences in this …