257 research outputs found
Dellinger Lecture 2006 - Cal Thomas
No full textCal Thomas addresses the Concordia Seminary Community in the Dellinger Lecture Series on his being a Christian
Recommended from our members
Report of Messrs. Bowie & Dellinger, from the Committee on the Constitution.
No full textReport of the Committee on the Constitution regarding the report of Thomas R. Bowie and H. Williams Dellinger, a minority on the Committee on the Constitution. Referring to the ongoing debate for certain amendments in the state, they noted that the two political parties hold differing opinions on the need to have further amendments. The report is followed by a proposed act, "An act to alter and amend the fifty-ninth article of the Constitution and Form of Government of the State of Maryland.
A Cosmology of Connection: Worldview, Ecology, Justice, and Education
No full textWhat are the connections between the Ecological Crisis, social justice, our cultural worldview, and the power of story? How can we build a movement that puts social justice at the center of cultural transformation for the future of the planet? This talk will examine the vision of Thomas Berry, the wisdom of Indigenous and African traditions, the worldview of Martin Luther King Jr., and emerging movements for social and ecological justice as examples of what Dellinger calls “a cosmology of connection.” Drawing on the speeches, sermons, and writings of Dr. King, Dellinger will explore ecological and cosmological dimensions of his vision that have been largely overlooked in previous scholarship. Dellinger will also discuss connections between ecology, justice, and cosmology, and ways to build movements using the power of dream, story, art, and action
J. Howard Dellinger
No full textJ. Howard Dellinger
Inducted: 1988
Citation:
For leadership in radio science, development and applications of electronics, especially in aviation, and founding chief of the Central Radio Propagation Laboratory.
Tenure: 1907-1948
Birth: 1886, Cleveland, Ohio
Death: 1962, Washington, DC
Education:
George Washington University: B.A., 1908; Sc.D., 1932
Princeton University, Ph.D., 1913
Positions held:
Chief, Radio Section
Chief, Central Radio Propagation Laboratory
Honors:
U.S. Department of Commerce Gold Medal, 1949
Institute of Radio Engineers: Gold Medal of Honor, 1938; Professional Group on Aerospace and Navigational Electronics, Pioneer Award, 1960
Radio Technical Commission for Aeronautics, Collier Trophy, presented by President Truman, 1950
Comite Consultif International des Radiocommunications Diploma of Honor, 1978 (posthumous)
Elected to Phi Beta Kappa
Memberships:
Institute of Radio Engineers (Fellow; President)
International Scientific Radio Union (Honorary Life President)
American Geophysical Union
Institute of Navigation
Associazione Italiana di Aerotechnica
Australia Institution of Radio Engineers
National Academy of Sciences
Radio Technical Commissions for Aeronautics (RTCA) and Marine Services (RTCM)
Washington Academy of Sciences
Cosmos Club
Publications:
Author of many articles, books, and treatises on radio science and development and applications of electronics, especially in aviation; accredited in 1912 with effectuating the shift from the internationally used term "wireless" to "radio.
Contribution to the chemoreception capacity of juvenile Loggerhead sea turtles (Caretta caretta, L.)
No full textLoggerhead sea turtle juveniles (Caretta caretta), pelagic stage, are found in waters of Madeira archipelago. Pelagic turtles are in the main growth phase of their life cycle and consequently higher energy needs. However, knowledge about the ecology of pelagic loggerhead sea turtles is still quite rudimentary, mainly about the mechanisms that lead them to find food in the vast ocean.
Studies with other pelagic species, such as procellariiform birds, revealed that the olfactory system play an important role for the detection of feeding areas, through the detection of concentration peaks of DMS (dimethylsulfide), a scent compound that naturally exists in the marine environment and it is related to areas of high productivity. Based on the assumption that loggerhead sea turtles use a similar mechanism, behavioural experiments were conducted in order to analyze the chemoreception capacity to DMS (airborne chemoreception - theoretically responsible for the long distance detection of areas with food patches; and aquatic chemoreception - theoretically responsible for the short distance detection of preys). The first step was to observe if pelagic loggerheads demonstrate sensitivity to DMS and the second was to verify if they really use the DMS, in natural conditions, as an airborne cue to find areas where food patches might be available.
Four juveniles of loggerhead sea turtles were tested in captivity and three wild turtles in the open ocean. The results of airborne chemoreception experiments in captivity revealed that one turtle clearly demonstrated sensitivity to DMS and the sea experiments confirmed this result. However, the experiments were not conclusive on the question whether the pelagic turtles actually use the DMS as an airborne cue to detect long distance food patches. In aquatic chemoreception experiments was not observed sensitivity to DMS by the three sea turtles tested. In the classical conditioning experiment, where DMS and food were given nearly at the same time revealed that after a certain period of time, the sea turtle tested did not associated the DMS stimulus with a possible food reward.
The main cause of mortality of loggerhead sea turtles in Madeira waters is due to the accidental capture (bycatch) by deep pelagic longlines fishery which the target species is the black-scabbard (Aphanopus carbo) fish. Chub mackerel (Scomber japonicus) is one of the baits used in this fishery. Aquatic chemoreception experiments were conducted in order to evaluate the attractiveness of the chub mackerel for sea turtles. For the three sea turtles tested, the results showed that in 90% of the cases the sea turtles were extremely attracted by the underwater smell of this fish.Centro de Ciências e Tecnologia da Madeir
Investigation of possibilities for detection of stress hormones in Loggerhead sea turtles by MALDI TOF mass spectrometry
No full textLoggerhead sea turtles (Caretta caretta) are the most abundant and widespread
sea turtle species in Madeiran waters. The species is considered endangered
and is protected worldwide, as they encounter many stressors, whether nat ural or anthropogenic. Being high in the food chain they serve as effective
indicator of marine ecosystem health.
The most common method to evaluate the physiological stress is the mea surement of corticosterone (CS) levels in plasma. There are several analytical
methods for determination of plasma corticosterone concentrations, however
most of them require tedious and complicated procedures. The approach for
detection and fast screening of CS in blood of a turtle tested in this work was
simple, as MALDI does not require sample derivatization, which is extremely
useful for analysis of low sample volumes.
Since MALDI has limitations in analysis of small molecules, cholesterol
was used as a model system for development of the method and as well nano materials (carbon dots (CDs), N-doped carbon dots (N-CDs) and graphene)
were used in order to overcome signal suppression in presence of inorganic
salts. It was found that CDs and N-CDs are sensitive to the cholesterol and
can be used either alone or in a binary system with 2,5-dihydroxybenzoic
acid (DHB) to improve detection. In the presence of NaCl, N-CDs had a
better reproducibility of results. Afterwards, CS was subjected to analysis,
the linearity, precision and limit of detection and quantification with three
organic matrices were investigated. Signal-to-noise ratio of the CS-derived
signal was used as parameter for quantification.
In order to achieve better linearity and precision, isotopically labeled cor ticosterone was added at fixed concentration, as a correction factor. The
signal at m/z 347.4 belonging to CS was clearly detected. The lowest mea sured concentration of CS extracted from plasma that was still detectable
by MALDI-TOF MS was 0.04 mg/mL, which is approximately ten times
higher than expected CS concentration in a turtles’ blood. The results of
this work showed that this method has a potential for quantification of CS
in turtles’ blood, however the sensitivity is low, and the method need further improvements.A tartaruga-marinha-comum (Caretta caretta) ´e a esp´ecie de tartaruga mar inha mais abundante e comum em ´aguas da Madeira. A esp´ecie ´e considerada
amea¸cada e est´a sob prote¸c˜ao a n´ıvel mundial, pois ´e exposta a v´arios fatores
de stresse, sejam estes naturais ou antropog´enicos. Estando numa posi¸c˜ao
alta da cadeia alimentar, a sua presen¸ca serve como um indicador efetivo da
sa´ude dos ecossistemas marinhos.
O m´etodo mais comum para avaliar o stresse fisiol´ogico ´e a medi¸c˜ao dos
n´ıveis de corticosterona (CS) em plasma. Existem v´arios m´etodos anal´ıticos
para determinar a concentra¸c˜ao de corticosterona em plasma, por´em a maio ria deles consiste em opera¸c˜oes tediosas e complicadas. A abordagem ap resentada neste trabalho para a dete¸c˜ao e mensura¸c˜ao r´apida ´e simples – a
MALDI n˜ao exige que se fa¸ca derivatiza¸c˜ao de amostras o que ´e extrema mente ´util para a an´alise de amostras de baixo volume. Como a MALDI tem
limita¸c˜oes em rela¸c˜ao `a an´alise de pequenas mol´eculas, foi usado colesterol
como o sistema modelo para desenvolver o m´etodo, bem como nanomateri ais (pontos de carbono (CD), pontos de carbono enriquecidos/dopados com
nitrog´enio (N-CD) e grafeno) para resolver a supress˜ao de sinais na presen¸ca
de sais inorgˆanicos.
Foi constatado que os CD e N-CD reagem ao colesterol e podem ser usa dos ou individualmente ou num sistema bin´ario com o ´acido gent´ısico (DHB)
para melhorar a sua dete¸c˜ao. Foi obtida uma melhor reprodutibilidade de re sultados usando N-CD na presen¸ca de NaCl. Posteriormente CS foi sujeita `a
an´alise, apoiada em trˆes matrizes orgˆanicas, na qual foi investigada a lineari dade, precis˜ao e limita¸c˜oes da dete¸c˜ao e quantifica¸c˜ao. A rela¸c˜ao sinal/ru´ıdo
do sinal derivado da CS foi usada como o parˆametro de quantifica¸c˜ao. Para
obter uma maior linearidade e precis˜ao, foi acrescentada uma concentra¸c˜ao
fixa de corticosterona marcada isotopicamente. A seguir, foi detetado clara mente o sinal de m/c 347.4 pertencente `a CS. A concentra¸c˜ao mais baixa da
CS extra´ıda do plasma, ainda detet´avel, foi 0.04 mg/mL, o que apresenta um
valor de concentra¸c˜ao da CS em sangue de uma tartaruga aproximadamente
dez vezes superior ao esperado. Os resultados deste trabalho demonstram que o m´etodo eleito tem potencial de ser utilizado na pr´atica de quantifica¸c˜ao de
sangue destes animais, embora com algumas limita¸c˜oes
Equestrian Team
No full textThis image was received from the Office of Communications in 2010.Members of the equestrian team are left to right Felicity Wood and Martah Thomas, seated; Sarah Tipton, Tara Krisle, Miriam Dolin, Thaddeus Knight, Raven Babcock, Laurent Dellinger and Jennifer Keirce
Perfil isotópico e contaminantes em tartaruga-comum Caretta caretta nos mares da Madeira
No full textTese de mestrado em Biologia da Conservação, apresentada à Universidade de Lisboa, através da Faculdade de Ciências, em 2017A tartaruga-comum, Caretta caretta, é uma espécie migratória que passa os primeiros anos de vida no alto mar, numa fase oceânica ou pelágica obrigatória também denominada de “anos perdidos”. Apesar desta fase constituir uma parte importante para o desenvolvimento dos juvenis de tartaruga-comum, é uma fase que ainda apresenta lacunas no conhecimento relativo à ecologia da espécie. A região oceânica do arquipélago da Madeira apresenta uma posição geográfica privilegiada para o conhecimento da ecologia dos juvenis de tartaruga-comum, uma vez que se insere na área de distribuição destes juvenis no Atlântico Norte. Atualmente não estão publicados estudos sobre o nível trófico e metais pesados para os juvenis de tartaruga-comum na região oceânica do arquipélago da Madeira. Este estudo permitirá melhorar o conhecimento da posição trófica através da análise de isótopos estáveis e dos níveis de contaminação por metais pesados em diferentes tecidos dos juvenis de tartaruga-comum para a região oceânica do arquipélago da Madeira. Foram analisados 24 exemplares capturados vivos e 12 exemplares recolhidos mortos nos palangres derivantes de profundidade. Foram efetuadas análises de isótopos estáveis e análises de quantificação de diferentes metais pesados (mercúrio, crómio, manganês, ferro, cobalto, níquel, cobre, zinco, arsénio, cádmio e chumbo) em diferentes tecidos (sangue, músculo, fígado, gordura e cérebro). Através da análise de isótopos estáveis foi demonstrado que existe uma diferença na posição trófica entre o grupo de tartarugas capturadas vivas e o grupo de tartarugas mortas nos palangres derivantes de profundidade, sendo que as últimas apresentam um valor médio mais elevado da razão isotópica de azoto. Neste estudo sugere-se que o grupo de tartarugas mortas no palangre derivante de profundidade constitui uma fração da população que apresenta especialização trófica. Não foram encontradas diferenças nas razões isotópicas de carbono para os dois grupos de tartarugas. Os resultados das análises de quantificação de metais pesados indicam que não existem diferenças entre os níveis de concentração média de mercúrio no sangue para os dois grupos de tartarugas analisados. A gordura foi o tecido que apresentou a menor concentração média de mercúrio ao passo que o fígado foi o tecido que apresentou a maior concentração média deste metal. Os valores de mercúrio no sangue estão relacionados com os valores de mercúrio encontrados no cérebro e músculo. Observou-se ainda que poderá estar a ocorrer um aumento de mercúrio conforme o nível trófico ocupado pelas tartarugas. Verificou-se uma maior propensão para a acumulação de mercúrio na sua forma orgânica quer no músculo quer no fígado. No geral foram encontrados baixos níveis de contaminação de todos os metais pesados analisados, com exceção do ferro, zinco e arsénio. Também foram encontradas associações de alguns metais pesados com o músculo e o fígado, sendo que o músculo se encontra associada à presença de zinco, chumbo e arsénio e o fígado à presença de manganês, ferro, cobalto, cobre, cádmio e mercúrio. Com base nos resultados obtidos neste estudo e em comparação com os resultados obtidos noutros estudos, parece que região oceânica do arquipélago da Madeira é uma área geográfica que apresenta baixos níveis de contaminação.The loggerhead sea turtle, Caretta caretta, is a migratory species that spends the first years of their life in the open sea, within an oceanic or pelagic stage also called “the missing years”. Although this life stage represents an important period for the development of juvenile loggerhead sea turtles, there are still gaps of knowledge concerning the ecology of these species during this oceanic stage. The oceanic region of Madeira archipelago has a privileged geographic position for the knowledge of the ecology of juvenile loggerhead sea turtles since it lies in the main area of distribution of North Atlantic juvenile loggerhead sea turtles.
There are no studies regarding the trophic niche and heavy metals for the juvenile loggerhead sea turtles in the oceanic region of Madeira archipelago. The present study will allow to improve the knowledge about the trophic position through stable isotopes analysis and the levels of contamination by heavy metals in different tissues of juvenile loggerhead sea turtles for this area. Twenty-four specimens captured alive and twelve specimens victims of bycatch in the depth-drifting longlines were collected and analysed. Stable isotope analysis and concentrations of different heavy metals (mercury, chromium, manganese, iron, cobalt, nickel, copper, zinc, arsenic, cadmium and lead) were performed in different tissues (blood, muscle, liver, fat and brain). Stable isotope analysis has shown that there is a difference in the trophic position between the group of turtles captured alive and the group of turtles victims of bycatch, with the latter showing a higher average value of the ratio of stable nitrogen isotope. It is suggested in the present study that the group of turtles victims of bycatch represents a fraction of the population that presents trophic specialization. Consequently, this group also presents a higher probability of death. No differences were found between the two groups of turtles regarding the values of the ratio stable carbon isotope. Heavy metals analysis has shown that there are no differences between the average concentrations of mercury concerning the two groups of turtles analysed in this study. The adipose tissue presented the lower average concentration of mercury while liver presented the higher average concentration. The concentrations of mercury in blood seem to be closely related with the mercury concentrations found in the brain and muscle. It was noticed that it may be occurring an increase of mercury in accordance to the trophic level occupied by turtles. There has been a greater propensity for an accumulation of mercury in its organic form in both muscle and liver. In general, low levels of contamination were found for all heavy metals analysed with the exception of iron, zinc and arsenic. There were also been found associations between some heavy metals with muscle and liver. Zinc, lead and arsenic were found associated with muscle while manganese, iron, cobalt, copper, cadmium and mercury were found associated with liver. Based on the results of this study and comparing the results acquired from other studies, it seems that the oceanic region of Madeira archipelago is a geographic area with low levels of contamination
Perfil isotópico e contaminantes em tartaruga-comum Caretta caretta nos mares da Madeira
No full textTese de mestrado em Biologia da Conservação, apresentada à Universidade de Lisboa, através da Faculdade de Ciências, em 2017A tartaruga-comum, Caretta caretta, é uma espécie migratória que passa os primeiros anos de vida no alto mar, numa fase oceânica ou pelágica obrigatória também denominada de “anos perdidos”. Apesar desta fase constituir uma parte importante para o desenvolvimento dos juvenis de tartaruga-comum, é uma fase que ainda apresenta lacunas no conhecimento relativo à ecologia da espécie. A região oceânica do arquipélago da Madeira apresenta uma posição geográfica privilegiada para o conhecimento da ecologia dos juvenis de tartaruga-comum, uma vez que se insere na área de distribuição destes juvenis no Atlântico Norte. Atualmente não estão publicados estudos sobre o nível trófico e metais pesados para os juvenis de tartaruga-comum na região oceânica do arquipélago da Madeira. Este estudo permitirá melhorar o conhecimento da posição trófica através da análise de isótopos estáveis e dos níveis de contaminação por metais pesados em diferentes tecidos dos juvenis de tartaruga-comum para a região oceânica do arquipélago da Madeira. Foram analisados 24 exemplares capturados vivos e 12 exemplares recolhidos mortos nos palangres derivantes de profundidade. Foram efetuadas análises de isótopos estáveis e análises de quantificação de diferentes metais pesados (mercúrio, crómio, manganês, ferro, cobalto, níquel, cobre, zinco, arsénio, cádmio e chumbo) em diferentes tecidos (sangue, músculo, fígado, gordura e cérebro). Através da análise de isótopos estáveis foi demonstrado que existe uma diferença na posição trófica entre o grupo de tartarugas capturadas vivas e o grupo de tartarugas mortas nos palangres derivantes de profundidade, sendo que as últimas apresentam um valor médio mais elevado da razão isotópica de azoto. Neste estudo sugere-se que o grupo de tartarugas mortas no palangre derivante de profundidade constitui uma fração da população que apresenta especialização trófica. Não foram encontradas diferenças nas razões isotópicas de carbono para os dois grupos de tartarugas. Os resultados das análises de quantificação de metais pesados indicam que não existem diferenças entre os níveis de concentração média de mercúrio no sangue para os dois grupos de tartarugas analisados. A gordura foi o tecido que apresentou a menor concentração média de mercúrio ao passo que o fígado foi o tecido que apresentou a maior concentração média deste metal. Os valores de mercúrio no sangue estão relacionados com os valores de mercúrio encontrados no cérebro e músculo. Observou-se ainda que poderá estar a ocorrer um aumento de mercúrio conforme o nível trófico ocupado pelas tartarugas. Verificou-se uma maior propensão para a acumulação de mercúrio na sua forma orgânica quer no músculo quer no fígado. No geral foram encontrados baixos níveis de contaminação de todos os metais pesados analisados, com exceção do ferro, zinco e arsénio. Também foram encontradas associações de alguns metais pesados com o músculo e o fígado, sendo que o músculo se encontra associada à presença de zinco, chumbo e arsénio e o fígado à presença de manganês, ferro, cobalto, cobre, cádmio e mercúrio. Com base nos resultados obtidos neste estudo e em comparação com os resultados obtidos noutros estudos, parece que região oceânica do arquipélago da Madeira é uma área geográfica que apresenta baixos níveis de contaminação.The loggerhead sea turtle, Caretta caretta, is a migratory species that spends the first years of their life in the open sea, within an oceanic or pelagic stage also called “the missing years”. Although this life stage represents an important period for the development of juvenile loggerhead sea turtles, there are still gaps of knowledge concerning the ecology of these species during this oceanic stage. The oceanic region of Madeira archipelago has a privileged geographic position for the knowledge of the ecology of juvenile loggerhead sea turtles since it lies in the main area of distribution of North Atlantic juvenile loggerhead sea turtles.
There are no studies regarding the trophic niche and heavy metals for the juvenile loggerhead sea turtles in the oceanic region of Madeira archipelago. The present study will allow to improve the knowledge about the trophic position through stable isotopes analysis and the levels of contamination by heavy metals in different tissues of juvenile loggerhead sea turtles for this area. Twenty-four specimens captured alive and twelve specimens victims of bycatch in the depth-drifting longlines were collected and analysed. Stable isotope analysis and concentrations of different heavy metals (mercury, chromium, manganese, iron, cobalt, nickel, copper, zinc, arsenic, cadmium and lead) were performed in different tissues (blood, muscle, liver, fat and brain). Stable isotope analysis has shown that there is a difference in the trophic position between the group of turtles captured alive and the group of turtles victims of bycatch, with the latter showing a higher average value of the ratio of stable nitrogen isotope. It is suggested in the present study that the group of turtles victims of bycatch represents a fraction of the population that presents trophic specialization. Consequently, this group also presents a higher probability of death. No differences were found between the two groups of turtles regarding the values of the ratio stable carbon isotope. Heavy metals analysis has shown that there are no differences between the average concentrations of mercury concerning the two groups of turtles analysed in this study. The adipose tissue presented the lower average concentration of mercury while liver presented the higher average concentration. The concentrations of mercury in blood seem to be closely related with the mercury concentrations found in the brain and muscle. It was noticed that it may be occurring an increase of mercury in accordance to the trophic level occupied by turtles. There has been a greater propensity for an accumulation of mercury in its organic form in both muscle and liver. In general, low levels of contamination were found for all heavy metals analysed with the exception of iron, zinc and arsenic. There were also been found associations between some heavy metals with muscle and liver. Zinc, lead and arsenic were found associated with muscle while manganese, iron, cobalt, copper, cadmium and mercury were found associated with liver. Based on the results of this study and comparing the results acquired from other studies, it seems that the oceanic region of Madeira archipelago is a geographic area with low levels of contamination
- …
