Browsing University of Hertfordshire by Title
Now showing items 5477-5496 of 24544
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Differential-effects of Nifedipine on nerve-mediated and noradrenaline-evoked contractions of rat anococcygeus muscle
(1993-11-30)In rat anococcygeus muscle the inhibitory effect of nifedipine (0.01. 0.1, 1.0 and 10 muM) was determined on adrenergic twitches in response to electrical field stimulation (trains of 4 pulses, 0.1 ms pulse duration. 10 ... -
Differentiating A and B groups of Leptosphaeria maculans, causal agent of stem canker (blackleg) of oilseed rape
(1999-04)Stem canker or blackleg of brassicas, caused by Leptosphaeria maculans, is one of the most damaging diseases of winter oilseed rape in the UK. Airborne ascospores, released in autumn and winter, initiate leaf infections ... -
Differentiating insight from non-insight problems
(2005)This study aimed to investigate whether a range of tasks that have been generally classed as requiring insight form an empirically separable group of tasks distinct from tasks generally classed as non-insight. In this ... -
Differentiating through Conjugate Gradient
(2018-11-02)We show that, although the Conjugate Gradient (CG) Algorithm has a singularity at the solution, it is possible to differentiate forward through the algorithm automatically by re-declaring all the variables as truncated ... -
Differentiation between cucurbit yellow stunting disorder virus and beet pseudo-yellows virus by a reverse transcription-polymerase chain reaction assay
(1998-06)Two whitefly-transmitted viruses elicit identical symptoms of interveinal chlorosis (yellowing) in greenhouse- and field-grown cucurbits in Mediterranean countries. The agents of these diseases are partially characterized ... -
Differing calcification processes in cultured vascular smooth muscle cells and osteoblasts
(2019-07-01)Arterial medial calcification (AMC) is the deposition of calcium phosphate mineral, often as hydroxyapatite, inthe medial layer of the arteries. AMC shares some similarities to skeletal mineralisation and has been ... -
Difficulties in early ice detection with the Small Ice Detector 2 HIAPER (SID-2H) in maritime cumuli
(2014-06)The Small Ice Detector 2 HIAPER (SID-2H) was used to attempt to detect small ice particles in the early stages of ice formation in the high liquid water environment of tropical maritime cumulus clouds sampled during the ... -
Diffuse gas in galaxies sheds new light on the origin of Type Ia supernovae
(2014-08-01)We measure the strength of He II λ4686 nebular emission in passively evolving ('retired') galaxies, aiming to constrain their populations of hot accreting white dwarfs (WDs) in the context of the single-degenerate (SD) ... -
Diffuse interstellar bands in the spectra of massive young stellar objects
(1997)We have compared the B−V colour excess, E(B–V), obtained for a sample of five optically visible massive YSOs both from diffuse interstellar bands (DIBs) in their spectra and from their optical continuum slopes. Our targets ... -
The Diffuse Ionized Gas Halo of the Large Magellanic Cloud
(2023-05-15)The Large Magellanic Cloud (LMC) has an extensive Hα emission halo that traces an extended, warm ionized component of its interstellar medium. Using the Wisconsin Hα Mapper telescope, we present the first kinematic Hα ... -
Diffuse Radio Emission from Galaxy Clusters in the LOFAR Two-metre Sky Survey Deep Fields
(2021-04-07)Low-frequency radio observations are revealing an increasing number of diffuse synchrotron sources from galaxy clusters, dominantly in the form of radio halos or radio relics. The existence of this diffuse synchrotron ... -
Diffuse X-Ray Emission in the Cygnus OB2 Association
(2023-11-01)We present a large-scale study of diffuse X-ray emission in the nearby massive stellar association Cygnus OB2 as part of the Chandra Cygnus OB2 Legacy Program. We used 40 Chandra X-ray ACIS-I observations covering ∼1.0 ... -
The diffusion of anticipatory standards with particular reference to the ISO/IEC information resource dictionary system framework standard
(2002-05-15)In the late 1980s, traditional standards development organisations were moving toward creating anticipatory standards as a way of coping with the fast growth in new technology in the computing industry. The development of ... -
Diffusion of e-government in Nigeria : a qualitative study of culture and gender
(University of Hertfordshire, 2012)E-government failure is prevalent in developing countries, and of the varying reasons for this, adoption of online products and services by citizens is one strong factor. Using this reasoning, this research-in-progress ... -
The diffusion of Performance and Image Enhancing Drugs (PIEDs) on the internet : The abuse of the cognitive enhancer Piracetam
(2014-12-06)Introduction: Performance and image-enhancing drugs (PIEDs), also known as “lifestyle drugs,” are increasingly sold on the Internet to enhance cognitive as well as sexual, muscular, attentive, and other natural capacities. ... -
Diffusion through the ex vivo vitreal body - bovine, porcine, and ovine models are poor surrogates for the human vitreous
(2018-10-25)The human vitreous humour is a complex gel structure whose composition and physical properties can vary considerably from person to person and also change with age. To date, the viscoelastic properties of the human vitreous ...