Effects of storage on starch and sugars contents of maine potatoes     

Treadway  R. H.  Walsh  Margaret D.  Osborne  Madelyn F. 《American Journal of Potato Research》1949,26(2):33-44

American Journal of Potato Research -  相似文献   

Assessing the green sea urchin (Strongylocentrotus drobachiensis) stock in Maine, USA     

Yong Chen  Margaret Hunter   《Fisheries Research》2003,60(2-3):527-537

The green sea urchin (Strongylocentrotus drobachiensis) fishery is of great importance to Maine’s economy. The fishery took off in the late 1980s as a result of expanding export markets, but has experienced substantial decline in landings since 1992 because of large decreases in urchin stock abundance. Fishery-independent surveys have not been conducted, and no formal stock assessment has been done prior to this study. Using the data collected from the fishery and urchin life history parameters derived from scientific studies, we conducted a formal stock assessment for the urchin stock. A stochastic observation-error length-structured model is used to describe the dynamics of the sea urchin population. A robust Bayesian approach is used for estimating fishery parameters because of concerns of possible outliers in fisheries data and mis-specification of priors. This study shows that the current stock is only 10% of the virgin stock biomass and that the exploitation rate is close to 40% suggesting that a large reduction in exploitation rate is necessary.  相似文献   

Progressive encephalomyelopathy and cerebellar degeneration in 10 captive-bred cheetahs     

Palmer AC  Callanan JJ  Guerin LA  Sheahan BJ  Stronach N  Franklin RJ 《The Veterinary record》2001,149(2):49-54

Progressive ataxia, with head tremor, developed in 10 captive-born cheetah cubs under six months of age. The condition was usually preceded by coryza and an ocular discharge. Initially the ataxia and weakness affected the hindquarters, then the forelegs, and head tremor developed later. Significant pathological changes were confined to the central nervous system. There was widespread Wallerian degeneration in the funiculi of the spinal cord (except those in the dorsal columns), in the medulla and in the cerebellum. In the cerebellum there was degeneration of Purkinje cells and of the molecular and granular cell layers. There was chromatolysis in the Purkinje cells, the ventral horn cells of the spinal cord and in the neurons of the lateral vestibular nucleus. The olivary nucleus was necrotic. There were foci of inflammatory cells in the molecular layer of the cerebellum and in the medulla. The cause of the disease remains unknown.  相似文献   

Introducing spatial grazing impacts into the prediction of moorland vegetation dynamics     

S. C. F. Palmer  I. J. Gordon  A. J. Hester  R. J. Pakeman 《Landscape Ecology》2005,19(8):817-827

Grazing by large herbivores is a major determinant of vegetation dynamics in many semi-natural ecosystems, including the replacement of heather moorland by rough grassland in the British uplands. Herbivore foraging is influenced by vegetation patterns and, in turn, their grazing drives vegetation dynamics. Although vegetation impacts are local, spatially heterogeneous local impacts can have different consequences as would the same impacts distributed uniformly. We constructed a simulation model of the spatial effects of grazing by sheep on the vegetation dynamics of heather moorland, a vegetation community of international conservation importance in the UK. The model comprised three sub-models to predict (1) annual average heather utilisation, (2) spatial variation in heather utilisation (higher near the edge of grass patches) and (3) competition between heather and grass. Here we compare the predicted heather utilisation and vegetation dynamics of the spatial model, relative to those of a non-spatial model. The spatial model resulted in a reduced loss of heather cover for a given sheep stocking rate. The model demonstrates how spatial interactions between large herbivores and their forage drive vegetation dynamics, leading to changes in community structure and composition. Indeed, omitting spatial effects in grazing models may lead to inaccurate predictions. We have shown that ecosystem modelling, based around an iterative dialogue between developers and experienced researchers, has the potential to make a substantial contribution towards the conservation and management of vulnerable landscapes. Combining modelling with experimental studies will facilitate progress towards understanding long-term vegetation/herbivore dynamics.  相似文献   

Intracranial germ cell tumours in two dogs     

B. A. Summers  A. C. Palmer  J. D. Littlewood  W. F. Blakemore 《The Journal of small animal practice》1989,30(1):39-42

Intracranial germ cell tumours were identified in two middle-aged, male dogs. The predominant clinical signs were progressive visual and pupillary abnormalities; one dog was blind. At post mortem examination a discrete extramedullary tumour was found at the base of the brain in each dog. Expansion of the mass had produced severe destruction of the diencephalon and brain stem. Histopathological examination revealed a mixed cellular pattern, consistent with a neoplasm derived from germ cells.  相似文献   

Toxicologic evaluation of O-ethyl O-(p-nitrophenyl)phenylphosphonothioate in cattle and sheep   总被引：1，自引：0，他引：1  

J S Palmer 《Journal of the American Veterinary Medical Association》1974,164(9):936-938

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Chemical Control of Chrysanthemum Leaf Miner and Some Observations on Varietal Preference   总被引：2，自引：2，他引：0  

N. Erench  Margaret E.  John A. Wright 《Plant pathology》1967,16(4):181-186

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The Food of Female Wheat Bulb Flies (Leptohylemyia coarctata (Fall.))     

F. Raw  Margaret G.  Jones P. H. Gregory 《Plant pathology》1968,17(1):23-25

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Certain cytologic features of the porcine adrenal medulla   总被引：1，自引：0，他引：1  

E G Palmer 《American journal of veterinary research》1978,39(8):1363-1366

Adrenal glands were collected from pigs of various ages under general anesthesia. Glutaraldehyde-fixed medullary tissue was postfixed with OsO4 for electron microscopy and with potassium dichromate or potassium iodate for light microscopy. Columnar epinephrine (E) cells formed cords between wide sinusoidal capillaries at the corticomedullary junction and were arranged in palisade fashion along the central vein and its major tributaries. The E cells usually were polarized, with the nuclei located away from the sinusoidal capillaries. Clusters of polygonal norepinephrine (NE) cells formed large central aggregates surrounded by E cells. Granulated vesicles were the predominant cytoplasmic feature of both E and NE cells. Round or oval E granules were bounded by a crenated membrane separated from the granule by a clear halo. The more electron-dense, elongate NE granules were bounded by a closely apposed, smooth membrane. The average longest granule axis was 270 nm for E granules and 305 nm for NE granules. Many cytoplasmic organelles were congregated in a granule-free paranuclear zone, which contained a prominent Golgi complex. Thin nonmyelinated nerve fibers (singly or in small groups) were interposed between the E and NE cells. Nerve fibers often were located close to the nucleus in a depression of the cell surface and often were wrapped by thin E or NE cell processes. The medulla of newborn pigs was composed predominantly or exclusively of NE cells. In both adults and pigs, E or NE cell cords radiated through the cortex toward the capsule, and isolated clusters of E or NE cells frequently were found in the capsule or zona glomerulosa.  相似文献   

Photodynamic therapy for the treatment of intranasal tumors in 3 dogs and 1 cat     

Lucroy MD  Long KR  Blaik MA  Higbee RG  Ridgway TD 《Journal of veterinary internal medicine / American College of Veterinary Internal Medicine》2003,17(5):727-729

Three dogs and 1 cat with intranasal tumors were treated with pyropheophorbide-a-hexyl ether-based photodynamic therapy (PDT). PDT was well tolerated by all the animals, and no adverse effects from photosensitizer injection, such as cutaneous photosensitization, were observed. Facial swelling was observed in all animals after each PDT treatment but resolved spontaneously within 72 hours after treatment. All animals had a decrease in severity of epistaxis, frequency of sneezing, and amount of nasal discharge after PDT. Clinical signs were controlled for variable time, although long-term responses were comparable with radiation therapy in 2 animals. This small case series demonstrates another application for PDT in veterinary medicine. On the basis of these findings. further studies are warranted to define the role of PDT in the management of intranasal tumors in dogs and cats.  相似文献