6 results on '"Lawrence, Alexandra"'
Search Results
2. Detecting low fragmented sites surrounding European protected areas – Implications for expansion of the Natura 2000 network.
- Author
-
Lawrence, Alexandra and Beierkuhnlein, Carl
- Subjects
PROTECTED areas ,NATURE conservation ,FRAGMENTED landscapes ,ECOLOGICAL zones ,CLIMATE change ,URBAN growth ,POPULATION density - Abstract
• Expanding protected areas (PAs) into low fragmented zones allows species to move with climate change. • Natura 2000 (N2k) PAs should be expanded into low fragmented zones. • Financial resources for nature conservation differ substantially among EU countries. • Eastern Europe's underfunded N2k PAs have high potential for expansion into low fragmented zones. • Expanding PAs into low fragmented zones ensures ecological quality and cost-effectiveness. EU member states have set an ambitious goal of establishing additional protected areas (PAs) preserving 30 % of terrestrial land by 2030, specifying that additions should be of high ecological quality. A targeted selection of existing PA expansions into surroundings marginally fragmented by human infrastructure, may be an efficacious strategy to secure high ecological quality by maximizing PA area, accommodating species movement, and boosting climate change resilience. We used high-resolution data on effective mesh density, a metric measuring landscape fragmentation, in the vicinity of Natura 2000 PAs (N2k) to assess their potential for expansion. Our results show that contrary to most of Central Europe, mountainous and remote territories exhibit the lowest degree of fragmentation in N2k surroundings. Fragmentation in N2k surroundings is highly correlated with national population density, while economic wealth, measured by GDP per capita, plays a minor role. To address the long-standing dilemma of where scarce economic resources in nature conservation do the most-good, we conducted a country-level comparison between fragmentation in N2k surroundings and national expenditures on nature conservation relative to N2k area. Our results show a vast incongruity in resource availability for nature conservation among EU countries. Eastern European states, especially Romania, host underfunded N2k PAs while holding the highest potential for expanding N2k PAs into low fragmented lands. If protecting low fragmented lands is accepted as an efficacious strategy to meet EU biodiversity targets our results could be used to formulate pragmatic conservation decisions, while also ensuring high ecological quality of PA additions under climate change. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
3. Synthesis and characterization of a lubricin mimic (mLub) to reduce friction and adhesion on the articular cartilage surface.
- Author
-
Lawrence, Alexandra, Xu, Xin, Bible, Melissa D., Calve, Sarah, Neu, Corey P., and Panitch, Alyssa
- Subjects
- *
PROTEOGLYCANS , *ARTICULAR cartilage , *JOINTS (Anatomy) , *FRICTION , *OVERUSE injuries , *PROTEIN expression - Abstract
The lubricating proteoglycan, lubricin, facilitates the remarkable low friction and wear properties of articular cartilage in the synovial joints of the body. Lubricin lines the joint surfaces and plays a protective role as a boundary lubricant in sliding contact; decreased expression of lubricin is associated with cartilage degradation and the pathogenesis of osteoarthritis. An unmet need for early osteoarthritis treatment is the development of therapeutic molecules that mimic lubricin function and yet are also resistant to enzymatic degradation common in the damaged joint. Here, we engineered a lubricin mimic (mLub) that is less susceptible to enzymatic degradation and binds to the articular surface to reduce friction. mLub was synthesized using a chondroitin sulfate backbone with type II collagen and hyaluronic acid (HA) binding peptides to promote interaction with the articular surface and synovial fluid constituents. In vitro and in vivo characterization confirmed the binding ability of mLub to isolated type II collagen and HA, and to the cartilage surface. Following trypsin treatment to the cartilage surface, application of mLub, in combination with purified or commercially available hyaluronan, reduced the coefficient of friction, and adhesion, to control levels as assessed over macro-to micro-scales by rheometry and atomic force microscopy. In vivo studies demonstrate an mLub residency time of less than 1 week. Enhanced lubrication by mLub reduces surface friction and adhesion, which may suppress the progression of degradation and cartilage loss in the joint. mLub therefore shows potential for treatment in early osteoarthritis following injury. [ABSTRACT FROM AUTHOR]
- Published
- 2015
- Full Text
- View/download PDF
4. Are oestrogens and genetic predisposition etiologic factors in the development of clear cell carcinoma of the peritoneum?
- Author
-
Wuntakal, Rekha and Lawrence, Alexandra
- Subjects
RENAL cell carcinoma ,PERITONEUM ,ESTROGEN ,IMMUNOHISTOCHEMISTRY ,CLINICAL pathology ,GENETIC disorders - Abstract
Abstract: A literature search was carried out for clinical observations that could explain the possible aetiology of primary peritoneal clear cell carcinoma (CCC) including diagnostic dilemmas, various theories of origin, oestrogen dependence and genetic association. It was found to be an extremely rare tumour (CCC) arising in the peritoneum and is often misdiagnosed as mesothelioma or serous carcinoma or metastatic adenocarcinoma due to overlapping morphological features. The awareness of such dilemmas is important even before making a diagnosis. Clinicopathological features and immunohistochemical studies like WT1, CK20 and calretinin are usually helpful in differentiating CCC from serous carcinoma, metastatic carcinoma from bowel and mesothelioma. (CK7 is common to all epithelial tumours, CEA can be expressed in clear cell carcinoma, WT1 is normally expressed in serous carcinoma, calretinin is expressed in mesothelioma and CK20 in colon carcinoma). The distinction between the above tumours is important as correct diagnosis is required in initiating appropriate treatment. Less than ten cases have been reported in the English language medical literature. Mullerian metaplasia and malignant transformation in endometriosis are two theories proposed for its existence. Peritoneal CCC can be oestrogen dependent in view of association with oestrogen dependent conditions which include endometriosis, adenomyosis and endometrial carcinoma. A genetic ascertain is difficult to be associated and needs further evaluation in a research setting in the familial cancer genetic clinics. [Copyright &y& Elsevier]
- Published
- 2013
- Full Text
- View/download PDF
5. Persistence of fimbrial tissue on the ovarian surface after salpingectomy.
- Author
-
Gan, Carmen, Chenoy, Rashna, Chandrasekaran, Dhivya, Brockbank, Elly, Hollingworth, Antony, Vimplis, Sotiris, Lawrence, Alexandra C., Jeyarajah, Arjun R., Oram, David, Deo, Nandita, Saravanamuthu, Jamna, Lam, Sarah S., Faruqi, Asma, Singh, Naveena, and Manchanda, Ranjit
- Subjects
SALPINGECTOMY ,OVARIAN epithelial cancer ,OVARIECTOMY ,HYSTERECTOMY ,FALLOPIAN tubes ,LONGITUDINAL method ,OVARIES - Abstract
Background: Salpingectomy is recommended as a risk-reducing strategy for epithelial tubo-ovarian cancer. The gold standard procedure is complete tubal excision.Objective: The purpose of this study was to assess the presence of residual fimbrial/tubal tissue on ovarian surfaces after salpingectomy.Study Design: Prospective analysis of patients who underwent salpingo-oophorectomy with or without hysterectomy for benign indications, early cervical cancer, or low-risk endometrial cancer at a UK National Health Service Trust. Salpingectomy with or without hysterectomy was performed initially, followed by oophorectomy within the same operation. Separately retrieved tubes and ovaries were sectioned serially and examined completely histologically. The main outcome measure was histologically identified fimbrial/ tubal tissue on ovarian surface. Chi-square/Fisher's exact tests were used to evaluate categoric variables.Results: Twenty-five consecutive cases (mean age, 54.8 ± 5.0 years) that comprised 41 adnexae (unilateral, 9; bilateral, 16) were analyzed. Seventeen (68.0%), 5 (20.0%), and 3 (12.0%) procedures were performed by consultant gynecologists, subspecialty/specialist trainees, and consultant gynecologic oncologists, respectively. Twelve of 25 procedures (48.0%) were laparoscopic, and 13 of 25 procedures (52.0%) involved laparotomy. Four of 25 patients (16.0%; 95% confidence interval, 4.5-36.1%) or 4 of 41 adnexae (9.8%; 95% confidence interval, 2.7-23.1%) showed residual microscopic fimbrial tissue on the ovarian surface. Tubes/ovaries were free of adhesions in 23 cases. Two cases had dense adnexal adhesions, but neither had residual fimbrial tissue on the ovary. Residual fimbrial tissue was not associated significantly with surgical route or experience (consultant, 3/20 [15%]; trainee, 1/5 [20%]; P=1.0).Conclusion: Residual fimbrial tissue remains on the ovary after salpingectomy in a significant proportion of cases and could impact the level of risk-reduction that is obtained. [ABSTRACT FROM AUTHOR]- Published
- 2017
- Full Text
- View/download PDF
6. Two week waits: What are we waiting for?
- Author
-
Khairy, Mohammed, Mohammed, Mo'men, Abdelraheim, Ahmed R., and Lawrence, Alexandra
- Subjects
- *
GYNECOLOGY , *ENDOMETRIAL cancer risk factors , *PERIMENOPAUSE , *POSTMENOPAUSE , *OVARIAN cancer , *CERVICAL cancer , *DIABETES , *FEMALE reproductive organ tumors , *MEDICAL care , *MEDICAL referrals , *PATIENTS , *TIME , *RETROSPECTIVE studies , *DIAGNOSIS , *TUMOR treatment - Abstract
Objectives: To evaluate the two-week referral system by analysing the 2-week wait (2WW) referrals to the rapid access gynaecology clinic over one year. We have also sought to identify the risk factors for endometrial cancer to help setting criteria that can be used to prioritise urgent appointments, refine subsequent management strategies.Study Design: Retrospective review of the data of all women referred for suspected gynaecological cancers over one year via the 2 WW office at Queen's Hospital, Romford, UK. Data of all other women in whom a diagnosis of a gynaecological malignancy was made during the same period following non-urgent (non-2WW) referrals were also collected.Results: Over one year, a total of 1105 women were referred under the 2WW for suspected gynaecological malignancy. A total of 765 patients (69.23%) were referred with suspected endometrial cancer and the main indication for referral was postmenopausal bleeding. Hundred-seventy nine women (16.20%) were referred with suspected ovarian cancer. A pelvic mass found in 62 of these women and this was the main indication of referral. The number of women referred with suspected cervical cancer was 117 (10.59%) and the main indication for referral was postcoital bleeding. Forty-four women (3.98%) referred with suspected vulvo-vaginal cancer and the main presentation was vulval lesion. The positive predictive value of referrals for diagnosing endometrial, ovarian, cervical and vulvo-vaginal malignancy was 8.1%, 9.5%, 5.98% and 13.64% and the overall predictive value for diagnosing gynaecological malignancy was 8.33%. The predictive values of the 2WW referrals for diagnosing different types of gynaecological cancers in premenopausal women are low compared to postmenopausal women (1.86% and 9.89% respectively, p<0.001). The number of cancers diagnosed through non-urgent system was higher than the number diagnosed through urgent system (95 vs. 92). Presence of diabetes mellitus, increased endometrial thickness, prolonged bleeding and advancing age represent the best model for predicting endometrial cancer.Conclusion: The overall predictive value of the 2WW system for suspected gynaecological malignancies is low particularly in premenopausal women. The current referral criteria need to be modified with a view to incorporating risk factors to prioritise urgent appointments and refine subsequent management plans. [ABSTRACT FROM AUTHOR]- Published
- 2017
- Full Text
- View/download PDF
Catalog
Discovery Service for Jio Institute Digital Library
For full access to our library's resources, please sign in.