John A Robbins

Biographic Data

ID5456836
NAMEJohn A Robbins
GIVEN NAMESJohn A
FAMILY NAMERobbins
SIGNATUREROBBINS J A
AFFILIATIONSSouthern Methodist University
ORCID0000-0002-8937-9613
VERIFIEDYes
TOTAL WORKS9
TOTAL CITATIONS34
AUTHOR COUNT9
EDITOR COUNT0
FIRST PUBLICATION YEAR1978
LATEST PUBLICATION YEAR2026
H-INDEX2

  • High-resolution carbonate isotope records of Holocene soil water balance and ecosystem dynamics in northern Iran loess

    Open AccessFarhad Khormali, Neil Tabor et al.ARTICLEQuaternary Research2026

    Stable carbon isotopes in Holocene soils provide key insights into past climate and ecosystems. This study presents high-resolution isotope analyses of pedogenic carbonates and organic carbon from modern loess-derived soils in northern Iran across a strong precipitation gradient (150–850 mm mean annual precipitation [MAP]). Eight soil profiles span five soil orders: Alfisols, Mollisols, Inceptisols, Aridisols, and Entisols. The mean δ 13 Cpc valu…

  • A 7000-year sea-surface temperature record from CA-SRI-147, Santa Rosa Island, California, USA

    Open AccessJohn A Robbins, Kurt M Ferguson et al.ARTICLEThe Holocene2013References: 7

    California mussels ( Mytilus californianus) excavated from archaeological site CA-SRI-147 on the southern side of Santa Rosa Island, California, provided a discontinuous environmental record spanning about 7000 years. An earlier report of the midden remains at this site found a weak inverse correlation between changes in mussel shell length and sea surface temperature (SST), but not productivity, and a decline in mussel size from ~5800 to 5100 ca…

  • Stable Isotopes from Marine Shells, Ancient Environments, and Human Subsistence on Middle Holocene Santa Rosa Island, California, USA

    T C Rick, John A Robbins et al.ARTICLEThe Journal of Island and Coastal…2006Cited by: 16References: 6

    We report the analysis of stable isotopes on a suite of marine and estuarine shellfish, along with faunal data, from a Middle Holocene red abalone midden (CA-SRI-191) on Santa Rosa Island, California. Our research suggests that people harvested red abalones, mussels, and estuarine shellfish at about 6000 cal BP. Later in time around 4300 cal BP, people relied on California mussel and sea urchin with only trace amounts of red abalone and no estuar…

  • Barriers to Health Care Access Among the Elderly and Who Perceives Them

    Annette L Fitzpatrick, Neil R Powe et al.ARTICLEAmerican Journal of Public Health2004Cited by: 18References: 25

    Objectives. We evaluated self-perceived access to health care in a cohort of Medicare beneficiaries. Methods. We identified patterns of use and barriers to health care from self-administered questionnaires collected during the 1993–1994 annual examination of the Cardiovascular Health Study. Results. The questionnaires were completed by 4889 (91.1%) participants, with a mean age of 76.0 years. The most common barriers to seeing a physician were th…

  • Sociodemographic Factors and the Assignment of Do-Not-Resuscitate Orders in Patients With Acute Myocardial Infarctions

    Jorge A García, Patrick S Romano et al.ARTICLEMedical Care2000References: 23

    OBJECTIVES: This study examined the impact of sociodemographic and clinical factors, measured at the individual or ecological (zip code) level, on the assignment of do-not-resuscitate (DNR) orders. DESIGN: This was a retrospective study (analysis of secondary data). SUBJECTS: We used a probability sample of 974 patients admitted to 30 medium to large California hospitals with acute myocardial infarctions in 1990 to 1991; the sample was originally…

  • Differences Between Family Physicians' and General Internists' Medical Charges

    Klea D Bertakis, L Jay Helms et al.ARTICLEMedical Care1999References: 10

    OBJECTIVES: Data from 509 primary care patients were analyzed to determine whether practice style differences between family physicians and general internists generate differential utilization of health care resources leading to differential medical charges. METHODS: New adult patients were prospectively randomized to care by family physicians and general internists. Utilization of medical care services and associated charges then were monitored …

  • Physician Practice Styles and Patient Outcomes: Differences Between Family Practice and General Internal Medicine

    Klea D Bertakis, Edward J Callahan et al.ARTICLEMedical Care1998References: 11

    OBJECTIVES: This study compared patient health status, patient satisfaction, and physician practice style between family practice and internal medicine. METHODS: New adult patients (n = 509) were prospectively and randomly assigned to family practice or internal medicine clinics at a university medical center and followed for 1 year of care. Practice styles were characterized by the Davis Observation Code. Self-reported health status (Medical Out…

  • The Influence of Gender on Physician Practice Style

    Klea D Bertakis, L Jay Helms et al.ARTICLEMedical Care1995

    As more women enter medicine, intriguing questions arise about how physician gender impacts practice style. To measure this influence in primary care encounters, 118 male and 132 female adult new patients, having no stated preference for a specific physician, were randomly assigned to university hospital primary care residents, and their initial encounters were videotaped. Forty-eight male and 33 female physicians participated. Patient health sta…

  • Comparative 210 Pb, 137 Cs, and Pollen Geochronologies of Sediments from Lakes Ontario and Erie

    Open AccessJohn A Robbins, D N Edgington et al.ARTICLEQuaternary Research1978

    The distribution of 210 Pb, 137 Cs, and Ambrosia (ragweed) pollen in two sediment cores from Lake Ontario and in three cores from Lake Erie provides independent estimates of sediment accumulation rates. Geochronology with 210 Pb is based on radioactive decay of the isotope following burial in sediments. The method can reveal with precision changes in sedimentation occurring over the past 100 yr or so. Geochronologies with 137 Cs and Ambrosia are …