1,720,965 research outputs found
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
INVESTIGATION ON THE ROLE OF cAMP IN PLANTS USING THE "cAMP-SPONGE"
No full textCyclic
AMP
is
a
well
known
second
messenger
involved
in
different
cellular
responses
in
all
living
organisms.
In
higher
plants,
its
role
as
second
messenger
has
been
widely
debated,
due
to
its
low
content
and
to
the
difficulty
of
measuring
it.
However,
its
natural
occurrence
and
the
existence
of
adenylyl-cyclases
and
cAMP
phosphodiesterases,
that
constitute
the
on-off
switches
needed
for
its
action
as
second
messenger,
have
been
demonstrated.
Data
accumulated
in
the
last
three
decades
show
the
involvement
of
cAMP
in
several
processes
of
higher
plants,
including
cell
cycle
regulation,
growth
and
reorientation
of
the
pollen
tube,
seed
germination
and
defense
responses.
However
little
is
known
on
the
mechanisms
involved
in
the
cAMP-dependent
signal
transduction
in
plants.
To
shed
light
on
cAMP
role
in
plant
signaling
pathways,
Arabidopsis
plants,
whose
genome
has
been
completely
sequenced,
and
tobacco
Bright
Yellow-2
(BY-2)
cells,
that
are
highly
synchronizable,
have
been
chosen
as
model
systems.
For
this
purpose,
both
Arabidopsis
plants
and
tobacco
BY-2
cells
were
transformed
with
the
"cAMP-sponge",
a
non
invasive
tool
able
to
selectively
reduce
cAMP
concentration
(Lefkimmiatis
et
al,
2009).
The
cAMP-sponge
is
composed
of
two
high-affinity
cAMP
binding
domains
of
the
regulatory
subunits
I
beta
of
human
protein
kinase A (PKARIbeta) that specifically bind cAMP and not cGMP.
The
construct
containing
the
cAMP-sponge
in
frame
with
the
reporter
gene
mCherry
were
mobilized
into
TBY-2
cells
and
Arabidopsis
via
A.
tumefaciens
-mediated
transformation.
Transgenic
TBY-2
calli
and
Arabidopsis
plants
were
selected
in
the
presence
of
appropriate
antibiotics,
and
several
independent
transgenic
lines
were
obtained.
Trans-gene
integration
and
its
expression
in
Arabidospsis
and
tobacco
transformed
lines
were
verified
by
PCR,
RT-PCR
and
immunoblotting
analyses.
The
low
levels
of
cAMP
negatively
affected
the
growth
of
TBY-2
cells
whereas
no
distinctive
phenotype
was
observed
in
Arabidobsis
plants.
However,
a
stress
condition
was
evidenced
for
both
tobacco
BY-2
cells
and
Arabidopsis
plants,
as
shown
by
the
alteration
of
their cellular redox state, analysed by ascorbate and glutathione measurement
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
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