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Articles 1 - 12 of 12
Full-Text Articles in Life Sciences
Culture Medium Ph Is Influenced By Basal Medium, Carbohydrate Source, Gelling Agent, Activated Charcoal, And Medium Storage Method, Henry R. Owen, Donna Wengerd, A. Raymond Miller
Culture Medium Ph Is Influenced By Basal Medium, Carbohydrate Source, Gelling Agent, Activated Charcoal, And Medium Storage Method, Henry R. Owen, Donna Wengerd, A. Raymond Miller
Henry R. Owen
When four carbohydrates were tested against six commonly cited inorganic basal media, post-autoclave pH was highest for carbohydrate-free and sucrose- containing media, and progressively lower for maltose-, P lucose-, and fructose-containing media, respectively, post-autoclave pH for these media without carbohydrates was related to medium buffering capacity. Addition of gelling agents (10 of 11 tested) increased the post¬autoclave pH of MS medium containing sucrose. Neutralized and acid-washed activated charcoal also increased the post-autoclave pH of liquid and agar- solidified MS medium, and the pH changed further during 8 weeks of storage. Changes in medium pH caused by gelling agents, but not …
Catch-Effort Estimation Of White-Tailed Deer Population Size, James M. Novak, Kim T. Scribner, William D. Dupont, Michael H. Smith
Catch-Effort Estimation Of White-Tailed Deer Population Size, James M. Novak, Kim T. Scribner, William D. Dupont, Michael H. Smith
James M. Novak
Estimation of population size is important for most research in population biology and in the management of game species. Using a stochastic, catch-effort, competing risks model (Dupont 1983), we estimated the population size of the Savannah River Site white-tailed deer (Odocotleus virginianus) herd for 1965-86. Population size varied markedly in response to changes in both hunting method and pressure. Still hunters preferentially harvested older animals compared to dog hunters. Deer were 2.37 times more susceptible to harvest from dog hunting than from still hunting. Hunter-induced mortality was estimated as 1.73 and 4.10 times as large as nonhunting mortality for still …
Frequency Distribution Of Conception Dates In A White-Tailed Deer Herd, James M. Novak, Olin E. Rhodes, Michael H. Smith, Paul E. Johns
Frequency Distribution Of Conception Dates In A White-Tailed Deer Herd, James M. Novak, Olin E. Rhodes, Michael H. Smith, Paul E. Johns
James M. Novak
Conception dates of white-tailed deer, Odocoi/eus virginia1111s (Zinunennann, 1780) were estimated for the breeding periods of 1974 - 76 and 1984 using fall and winter- spring fetal data. Conception dates estimated from data collected in the fall were biased. This bias resulted in an earlier mean conception date than that based on information which included data from later breeding females. Mean breeding dates differed significantly between female age classes due to delayed conception in fawns which also resulted in a skewed frequency distribution of conception dates. The frequency distribution of conception dates was leptokurtotic, suggesting that the distribution is constrnincd …
The Palmer Philosophy Of Chiropractic – An Historical Perspective., Dennis M. Richards
The Palmer Philosophy Of Chiropractic – An Historical Perspective., Dennis M. Richards
Dennis M Richards
This paper presents the Palmer philosophy of chiropractic from an historical viewpoint. It examines how influences in the life of DD Palmer, such as spiritualism, theosophy and magnetic healing helped to shape the chiropractic philosophy expressed by him. It also oulines the philosophy of BJ Palmer, explaining how it may have been influenced by legal challenges to the early pioneers of chiropractic. Contemporary expression of the Palmer philosophy, as articulated by Strang, is also noted.
Taxon-Specific Differences In Responsiveness To Capsaicin And Several Analogues: Correlates Between Chemical Structure And Behavioral Aversiveness, Russell Mason, Jay Bean, Pankaj Shah, Larry Clark
Taxon-Specific Differences In Responsiveness To Capsaicin And Several Analogues: Correlates Between Chemical Structure And Behavioral Aversiveness, Russell Mason, Jay Bean, Pankaj Shah, Larry Clark
Larry Clark
The present set of experiments was designed to explore avian insensitivity to capsaicin. Based upon a molecular model of avian chemosen sory repellency, we hypothesized that structural modifications of the basic capsaicin molecule, which is itself not aversive to birds, might produce aver sive analogues. To this end, European starlings (Sturnus vulgaris) and Nor way rats (Rattus norvegicus) were given varied concentrations of synthetic capsaicin and four analogues (methyl capsaicin, veratryl amine, veratryl acet amide, vanillyl acetamide) in feeding and drinking tests. The results agreed with a model that we are developing to describe the chemical nature of avian repellents. …
Chemical Repellency In Birds: Relationship Between Chemical Structure And Avoidance Response, Larry Clark, Pankaj Shah, Russell Mason
Chemical Repellency In Birds: Relationship Between Chemical Structure And Avoidance Response, Larry Clark, Pankaj Shah, Russell Mason
Larry Clark
We examined how molecular structure of24 anthranilate and benzoic acid deriva tives correlated with drinking behavior in European starlings Sturnus vulgaris.The effectiveness of bird repellents was &?SOciated with basicity, the presence of an electron onating group in resonance with an electron-withdrawing carboxylic group on a phenyl ring, and a heterocyclic ring in the same pi cloud plane as the phenyl ring. Of the benzoic acid derivatives tested in this study, methyl, ethyl, dimethyl, and linalylanthranilate as well as anthranilic acid and 4-ketobenztriazine were repellent to birds. Water consumption was significantly reduced relative to control levels at concentrations as low as …
Odor Detection Thresholds In Tree Swallows And Cedar Waxwings, Larry Clark
Odor Detection Thresholds In Tree Swallows And Cedar Waxwings, Larry Clark
Larry Clark
No abstract provided.
Ortho-Aminoacetophenone Repellency To Birds: Similiarities To Methyl Antrhanilate, Russell Mason, Larry Clark, Pankaj Shah
Ortho-Aminoacetophenone Repellency To Birds: Similiarities To Methyl Antrhanilate, Russell Mason, Larry Clark, Pankaj Shah
Larry Clark
Methyl anthranilate is an effective bird repellent at concentrations 2:1.0% (g/g). Ortho-ami noacetophenone (OAP) has an odor similar to that of methyl anthranilate and is chemically (structurally) similar. Coincidentally, OAP is present in the scent gland secretions of mustelid species that prey on birds. For these reasons, we chose to test the bird repellency of this material and 3 isomers to European starlings (Stumus vulgaris). Ortho-aminoacetophenone was repellent at concentrations :50.01% in both choice and no-choice feeding tests. The other structural isomers (meta-, para-, alpha-) were less effective. Chemically, the results suggest that hydrogen-bonded ring structure formation and basicity predict …
Nonlethal Bird Repellents: In Search Of A General Model Relating Repellency And Chemical Structure, Larry Clark, Pankaj Shah
Nonlethal Bird Repellents: In Search Of A General Model Relating Repellency And Chemical Structure, Larry Clark, Pankaj Shah
Larry Clark
Identification of potential repellents through molecular modeling has implications for the devel opment of commerciaUy viable, ecologically sound. nonlethal bird repellents. We tested isomers (ortho, meta, para) and moieties (amino, hydroxy, methoxy) of acetophenones for their effectiveness as bird repellents to better understand the nature of repellency in birds. ChemicaUy, basicity of a substituted phenyl ring, as de&ned by the electron-donating substituent, probably is an important feature infiuencing repellency; i.e., more basic substituents result in more potent repellents. Isomeric position of the electron-donating substituent, which leads to resonance of lone pairs of electrons.• is also an important feature of repellency; …
Chemical Bird Repellents: Applicability For Deterring Use Of Waste Water, Larry Clark, Pankaj Shah
Chemical Bird Repellents: Applicability For Deterring Use Of Waste Water, Larry Clark, Pankaj Shah
Larry Clark
Regulatory agencies have placed increasing emphasis on agriculture and industry to protect wildlife from mortality associated with the consumption of waste water. Traditional hazjng methods to keep birds away from areas have met with marginal success. The only effective commercially available solution is .to enclose impoundments with netting. This strategy is costly and is subject to engineering constraints when large areas are to be protected. Molecular modeling techniques were used to identify chemical repellents to be added to waste water. These repellents effectively prevent birds from drinking or swimming in treated water.The most effective repellents are those containing an electron …
Prediction Of Avian Repellency From Chemical Structure: The Aversiveness Of Vanillin, Vanillyl Alcohol, And Veratryl Alcohol, Pankaj Shah, Larry Clark, Russel Mason
Prediction Of Avian Repellency From Chemical Structure: The Aversiveness Of Vanillin, Vanillyl Alcohol, And Veratryl Alcohol, Pankaj Shah, Larry Clark, Russel Mason
Larry Clark
The effectiveness of bird repellents is associated with the presence of an electron-withdrawing group (carbonyl or carboxyl) and an electron-donating group in resonance on a phenyl ring. The present experiments were designed to examine the relative importance of these structural features. European starlings (Sturnus vulgaris) were presented with vanillin, vanillyl alcohol, and veratryl alcohol in two-cup and one-cup feeding trials and in one-bottle drinking tests. In feeding trials, veratryl alcohol was significantly more aversive than the other two chemicals. In drinking tests. veratryl alcohol was repellent only at the highest concentration (0.5% ml/ml), and was lethal at that concentration and …
Reproductive Compatibility Of New World Screwworms, Cochliomyia Hominivorax, From North Africa And Central America., David B. Taylor, Leslie Hammack, Richard L. Roehrdanz
Reproductive Compatibility Of New World Screwworms, Cochliomyia Hominivorax, From North Africa And Central America., David B. Taylor, Leslie Hammack, Richard L. Roehrdanz
David B Taylor
The reproductive compatibility of New World screwworms, Cochliomyia hominivorax (Coquerel), from North Africa and a strain being mass produced for the Mexican eradication programme was examined to assess the feasibility of using flies from the Mexican screwworm mass production facility for a sterile insect technique eradication programme in North Africa. Males from the production strain mated randomly with females from North Africa and from the production strain when both were present. Neither strain of males discriminated between cuticular extracts of North African and production strain females containing a contact sex pheromone. Interstrain crosses between North African flies and production flies …