1,207 research outputs found
Hodgson, Alan N (Prof)
No full textDepartment of Ichthyology and Fisheries Science (1983-2018) Alan Hodgson ORCID 0000-0003-3609-9578 Prof Alan Hodgson. President of the International Society of Invertebrate Reproduction (2002) Prof Alan Hodgson. President of the Zoological Society of Southern Africa (2002) Prof Alan Hodgson. Zoological Society of SA Gold Medal (2007) Vice-Chancellor’s Distinguished Senior Research Award 2010. Professor Alan Hodgson DSc by Manchester University for his contributions to invertebrate tissues structure and function Top 30 Rhodes Researchers 2012</a
The short and long term electric strength of polyethylene insulation
No full textThe mechanisms which lead to the long term deterioration of electric strength in polyethylene insulated high voltage cables are diverse. The degree to which each contributes to the degradation of the material and the consequential reduction in its insulating properties is dependent on many factors. This research investigated the long term degradation of polyethylene insulation and the factors which contribute to reduced working life. The short term electric strength of crosslinked polyethylene was also examined using a.c. stress and single impulses. These methods were used to explore the characteristics of thin slices microtomed from cable insulation. The a.c. electric strength was examined and was found to decrease as temperature increased. The electric strength of similar samples which had been treated in a vacuum was also examined. This treatment had the effect of raising the electric strength of the material. Large single impulses were used to measure the electric strength of polyethylene insulation. Impulses with rise times ranging from 0.25μs to 300μs were used at temperatures between 50oC and 110oC. It was found that the electric strength determined by this method was again dependent on temperature, and also on the rise time of the impulse. Additive free high density polyethylene was used for the investigation into long term degradation. Thus ageing was not affected by the presence of additives and crosslinking by-products. Moulded samples were electrically stressed at 40kV/mm for up to 14 months. The short term electric strength was measured prior to and after the period of ageing, using the single impulse method. This was found to decrease from approximately 370kV/mm to about 300kV/mm after 10,000 hours. Infrared spectroscopy was used to examine structural changes in the material, but was not able to determine the cause of the reduction in electric strength. The effect of oxidation on the electric strength of the material was examined. The polyethylene powder was thermally oxidised in air before thin films were moulded. The degree of oxidation was quantified using infrared spectroscopy and the electric strength was measured using the single impulse method. With a carbonyl concentration estimated to be 4 carbonyl groups per 104 carbon atoms, the electric strength was found to be reduced by about 10%.</p
Lecanodiaspis zygophylli Hodgson 1973
No full textLecanodiaspis zygophylli Hodgson, 1973 Material studied: NIGERIA, Zaria, Ahmadu Bello University, on Terminalia catappa (Combretaceae), Oct. 1986, C.J. Hodgson, 1 adult ♀. Comments: Lecanodiaspis zygophylli was originally described from Mauritania, collected on twigs of Zygophyllum waterlotii (Zygophyllaceae) (Hodgson 1973). It is very close to L. africana Newstead but differs in a number of rather subtle characters (contrasting condition in L. africana in brackets), perhaps the most obvious being that L. zygophylli has cribriform plates in four rows (in 2 rows) and the 8-shaped pores on the dorsum are of two sizes distributed in a specific pattern (only one size, more or less randomly distributed). Whilst visiting Nigeria in 1986, the author collected a further specimen of Lecanodiaspis on Terminalia. Whilst this specimen is considered to be L. zygophylli, it differs in a few possibly important characters from the original description, namely (characterstate on original type material in brackets): (i) antennae 7 segmented, although segment IV on one antenna shows slight pseudo-articulation (antennae 8 segmented); (ii) fusion of leg segments even greater than in type material; (iii) claw very reduced, more or less to just a point or even less (claw reasonably normal, with a small denticle); (iv) multilocular disc-pores rapidly decreasing in number anteriorly, with very few in thorax and head (multilocular discpores remaining fairly abundant in thorax and with 1 near each antennal base); (v) ventral setae very few, with none anterior to abdominal segment II (ventral setae scarce but, for instance, inter-antennal setae present); (vi) marginal setae very scarce or absent, almost entirely restricted to near anal lobes (with 6-12 marginal setae on each side); and (vii) with 0 or 1 cribriform plate in each outer 2 rows (3 pores in each outer row). Despite these differences, the general layout and dimensions of the rest of the structures, particularly the distribution of the 8-shaped pores on the dorsum, are almost identical.Published as part of Hodgson, Chris J., 2021, New genera, new species and new combinations for some African Coccomorpha (Hemiptera: Sternorrhyncha), pp. 57-80 in Zootaxa 5020 (1) on page 78, DOI: 10.11646/zootaxa.5020.1.3, http://zenodo.org/record/522296
Hodgson, Shirley: transcript of a video interview (04-Nov-2015)
No full textInterview with Professor Shirley Hodgson, conducted by Professor Tilli Tansey, for the History of Modern Biomedicine Research Group, 04 November 2015, in the School of History, Queen Mary University of London. Transcribed by Mrs Debra Gee, and edited by Ms Emma M. Jones, Professor Tilli Tansey and Dr Apostolos Zarros. The project management and the technical support (filming and production) were undertaken by Mr Adam Wilkinson and Mr Alan Yabsley, respectively. Professor Shirley Hodgson BSc BM BC DM D(Obst)RCOG FRCP DCH FRSB (b. 1945) began her career as a Paediatrician and General Practitioner. She became a Registrar in Clinical Genetics at Guy’s Hospital, 1980, and worked with Professor Victor Dubowitz at the Hammersmith Hospital on muscular dystrophy whilst doing the work for her DM Thesis. She became a Consultant in Clinical Genetics at Addenbrooke’s Hospital in 1988, and Consultant/Reader in Clinical Genetics at Guy’s in 1990. She specialised in cancer genetics from 1989, working with the Imperial Cancer Research Fund (now Cancer Research UK), developing regional cancer genetics services at Guy's, St. Mark’s and St. George’s Hospitals in London. In 2003 she was appointed Professor of Cancer Genetics at St. George’s, University of London, now Emerita, and has part-time Consultant status in Leicester. Her research investigated inherited aspects of cancer predisposition, she has published widely on the subject, and co-authored several books, including 'Inherited Susceptibility to Cancer' (Foulkes and Hodgson (eds), 1998), and 'A Practical Guide to Human Cancer Genetics' (Hodgson and Maher, 1993), now into its fourth edition with W. Foulkes and C. Eng as co-authors (Springer).The History of Modern Biomedicine Research Group is funded by the Wellcome Trust, which is a registered charity (no. 210183). The current interview has been funded by the Wellcome Trust Strategic Award entitled “Makers of modern biomedicine: testimonies and legacy” (2012-2017; awarded to Professor Tilli Tansey)
Hodgson, Shirley: transcript of an audio interview (04-Nov-2015)
No full textInterview with Professor Shirley Hodgson, conducted by Professor Tilli Tansey, for the History of Modern Biomedicine Research Group, 04 November 2015, in the School of History, Queen Mary University of London. Transcribed by Mrs Debra Gee, and edited by Ms Emma M. Jones, Professor Tilli Tansey and Dr Apostolos Zarros. The project management and the technical support were undertaken by Mr Adam Wilkinson and Mr Alan Yabsley, respectively. Professor Shirley Hodgson BSc BM BC DM D(Obst)RCOG FRCP DCH FRSB (b. 1945) began her career as a Paediatrician and General Practitioner. She became a Registrar in Clinical Genetics at Guy’s Hospital, 1980, and worked with Professor Victor Dubowitz at the Hammersmith Hospital on muscular dystrophy whilst doing the work for her DM Thesis. She became a Consultant in Clinical Genetics at Addenbrooke’s Hospital in 1988, and Consultant/Reader in Clinical Genetics at Guy’s in 1990. She specialised in cancer genetics from 1989, working with the Imperial Cancer Research Fund (now Cancer Research UK), developing regional cancer genetics services at Guy's, St. Mark’s and St. George’s Hospitals in London. In 2003 she was appointed Professor of Cancer Genetics at St. George’s, University of London, now Emerita, and has part-time Consultant status in Leicester. Her research investigated inherited aspects of cancer predisposition, she has published widely on the subject, and co-authored several books, including 'Inherited Susceptibility to Cancer' (Foulkes and Hodgson (eds), 1998), and 'A Practical Guide to Human Cancer Genetics' (Hodgson and Maher, 1993), now into its fourth edition with W. Foulkes and C. Eng as co-authors (Springer).The History of Modern Biomedicine Research Group is funded by the Wellcome Trust, which is a registered charity (no. 210183). The current interview has been funded by the Wellcome Trust Strategic Award entitled “Makers of modern biomedicine: testimonies and legacy” (2012-2017; awarded to Professor Tilli Tansey)
Helen Hodgson
No full textPhotograph - Helen Hodgson and a girl in front of Alice and Cliff Donahue's house, Athabasca, Albert
Black womanism in South Africa: Princess Emma Sandile
No full textJanet Hodgson tells the inspiring story of Emma Sandile (1842-1892)- Princess Emma, as she was known in southern African colonial circles' in a narrative that reads like a novel, but is all true, based on archival sources and extensive fieldwork. Tracing the life of this pioneer of black womanism, Hodgson explores Sandile's early years, her education, and her many achievements as she became the first black woman landowner in Southern Africa and author of the first known work in English by an Xhosa woman. Princess Emma successfully bridged her African traditions with the imposed Western culture, facing challenges that will resonate with readers today.
Xenolecanium pendleburyi Hodgson 2022, sp. nov.
No full textXenolecanium pendleburyi Hodgson sp. nov. Material examined. Two slides: 1. Holotype + 7 paratype adff (here designated): top label with two lines of Japanese characters [ロẏ±/+ = Ronbonoki; Īẏ=ẏfi Ḣ = Tenninka-Ka]; bottom label: Xenolecanium / pendleburyi / Takahashi / Takahashi / 25.v.1944 / Singapore / R. Takahashi (holotype adf + 7 paratype adff in fairly-good condition; NHM). In addition, with a small white label: Brit. Mus./1955-812, and a small round Type label. Two further labels are stuck on the back: left label with a map showing position of holotype specimen; right label: Xenolecanium / pendleburyi / Hodgson / holotype / + paratypes. 2. Paratypes (here designated): top label:Pres. By /Com.Inst.Ent./B.M. 1963-789; bottom label: Xenolecanium / pendleburyi / Takahashi / 25.v.1944 / Singapore / R. Takahashi (19 paratype adff (mainly fair but a bit distorted; NHM). Two further labels stuck on the back: left label: clean, without writing; right label: Xenolecanium / pendleburyi / Hodgson / paratypes. Note: Regarding the Japanese text, the meaning of Ronbonoki is uncertain, but “Tenninka-Ka” is an old name for Hutomomo-Ka, which refers to the Myrtaceae. In addition, the Tenninka might be translated as genus Rhodomyrtus (Myrtaceae). Both slides have numerous small 1-3 µm-wide globules throughout, making distinction of the various micropores from the globules more or less impossible. Most of the specimens contain well-developed nymphs. Adult female (Fig. 3). Described mainly from holotype specimen but data also taken from several other paratype specimens on the holotype slide. Slide-mounted material. Body oval, 2.4–2.75 mm long, 1.7–1.8 mm wide. Stigmatic clefts obviously indented; anal cleft about 1/5 total body length; cleft probably fused. Dorsum. Derm membranous when young, becoming more sclerotized with maturity; with a strongly sclerotized area around anterior margin of anal plates; and with strongly sclerotized inner margins to each stigmatic cleft. Derm with numerous circular to slightly oval sclerotized areas, of more-or-less 2 sizes: those near the margin and on either side of anal plates more oval, each about 10–18 µm wide; larger sclerotized areas each with outer margin about 30-60 µm wide with a paler, clearer area medially 15–25 µm wide (not always visible); sclerotized areas spread fairly sparsely throughout dorsum but absent from a fairly broad area medially anterior to anal plates and where smaller type present. Dorsal setae short, setose, often bent, each 3–4 µm long, only slightly longer than width of setal socket; frequent throughout except submedially. Preopercular pores small, each about 3 µm wide; rather sparse in fairly narrow submedial bands, extending from anal plates to anterior to cribriform plate. Other dorsal pores of possibly 2 types present (the presence of small globules in the balsam make identification very difficult): (i) dorsal simple pores, and (ii) dorsal microducts (as these are present on all other known species of Xenolecanium, they are likely to be present). In addition, a cribriform plate, beehive shaped with sclerotized pores, present medially, moreor-less dorsad to mouthparts, with pores rather loosely arranged, each pore strongly sclerotized, closed and about 5.0–8.0 μm wide. Dorsal tubular ducts, dorsal tubercles and pocket-like sclerotizations absent. Anal plates together pyriform, widest about 2/3rds down length; length 135–170 μm, combined width 150–175 μm long; anterior margin slightly convex and each plate more or less pointed at posterior end; each plate with 4 strong setae: 2 just in from inner margin, plus 1 strong, rather stout seta on each apex (35–50 μm long) and 1 stoutish seta near apex on posterior margin; also with 0–2 small pores. Anogenital fold not very clear but appearing to have ventral margin displaced posteriorly to almost level with anal plate apex. Anal ring rather small; number of setae uncertain. Eyespot not detected. Margin not crenulated. Marginal setae all stoutly setose; each 15–25 μm long, with about 35 or 36 setae between anterior stigmatic clefts, 12–17 setae on each side between stigmatic areas, and 28–55 setae on each side of abdomen. Stigmatic clefts deep (about 80–85 μm deep), each narrow near margin but broadening inwardly, with a strongly sclerotized curved bar around inner margin; number of stigmatic setae very variable: 1–3 (but most commonly 2), each 8–17 μm long; each seta parallel sided with a very blunt apex. Venter. Derm entirely membranous. Multilocular disc-pores absent. Spiracular disc-pores, each 3-4 μm wide, mainly each with 5 loculi, present in broad bands between margin and each spiracle, frequency uncertain but few, maybe 10 in each band (all stigmatic grooves full of fluffy wax), with none apparently extending over spiracles but with a small group of perhaps 3–6 disc-pores on each side of each stigmatic cleft, often hidden by the cleft sclerotization. Ventral microducts minute, each perhaps 0.7 μm wide, sparse but possibly present throughout. Ventral tubular ducts represented by only 1 or no ducts on either side of posterior margin of anal apparatus on abdominal segment VI, each with an outer ductule about 16 μm long, but inner ductule absent or indistinct (these could only be found on about 1 in 5 specimens). Preantennal pores absent. Ventral setae frequent, most abundant in a broad submarginal band and possibly absent medially on thorax and head; pairs of long setae medially on segment VII present or absent but with bands of shorter setae across more anterior abdominal segments; inter-antennal setae not noted; without a group of setae beneath apex of each anal plate as in other species above. Antennae very reduced, with segmentation indistinct, but perhaps with 4 or 5 ring-like segments; total length about 30 μm. Clypeolabral shield 175–190 μm long. Spiracles well developed, width of peritremes: anterior 45–50 μm, posterior 50–58 μm. Legs very reduced, with segmentation very indistinct, each leg about 16–25 μm long; claw minute; all digitules extremely hard to distinguish but present, probably all setose. Etymology. It is thought that this species was originally named by Takahashi after Henry Maurice Pendlebury. H.M. Pendlebury was born in 1893 in the U.K. and died in 1945 in Bangalore, South India, while en route by air from a Prisoner-of-War camp in Singapore to England. He was an entomologist interested in predatory butterfly larvae and ant-tended caterpillars and was co-author (with A.S. Corbet) of The Butterflies of the Malay Peninsula, first published in 1933, which has since been revised and republished. He was author or co-author of nine Lepidopteran taxa. Comments. The only other species of Xenolecanium with marginal setae that are neither fimbriate nor paddlelike is X. maritimum, described above. Xenolecanium pendleburyi differs from it in having spiracular disc-pores along the margins of each stigmatic cleft. In addition, it differs from X. maritimum and other Xenolecanium species in having the following combination of characters: (i) finely spinose marginal setae; (ii) cribriform plate dorsad to mouthparts composed of a loose group of sclerotized pores not forming an obvious plate; (iii) ventral tubular ducts either absent or extremely few on either side of vulva; (iv) large oval sclerotized areas much larger and fewer than on other species; (v) margin not crenulated, and (vi) apical seta on each anal plate strong and spinose.Published as part of Hodgson, Chris J., 2022, Three new species of the genus Xenolecanium Takahasi (Hemiptera: Coccomorpha: Coccidae), with an updated generic diagnosis and key to species, pp. 457-466 in Zootaxa 5222 (5) on pages 463-465, DOI: 10.11646/zootaxa.5222.5.4, http://zenodo.org/record/747190
Wedding Photograph
No full textPhotographic print of the wedding of Carlos Rosaire and Tina Paulo (Violetta Butcher) beside their wedding cake with 'Little Alan' in the background. 'Harry Hodgson Copyright Foto, 115 Gloucester Terrace, London, W2' stamped on reverse. According to 'The World's Fair' newspaper the wedding took place at the Roman Catholic Church of the Most Holy Redeemer, Billericay, Essex
Addendum
No full textAn addendum to the article ‘Reproductive seasonality of southern African inshore and estuarine invertebrates – a biogeographic review’ by A.N. Hodgson that appeared in African Zoology 45(1): 1–17 (April 2010
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